580 results on '"Masafumi Yano"'
Search Results
2. Dantrolene improves left ventricular diastolic property in mineralcorticoid-salt-induced hypertensive rats
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Junya Nawata, Takeshi Yamamoto, Shinji Tanaka, Yasutake Yano, Tomoyuki Uchida, Shohei Fujii, Yoshihide Nakamura, Takeshi Suetomi, Hitoshi Uchinoumi, Tetsuro Oda, Shigeki Kobayashi, and Masafumi Yano
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Dantrolene ,Calmodulin ,Hypertrophy ,HFpEF ,Biology (General) ,QH301-705.5 ,Biochemistry ,QD415-436 - Abstract
Left ventricular (LV) diastolic dysfunction is increasingly common in heart failure with preserved ejection fraction (HFpEF), and new drug therapy is desired. We recently reported that dantrolene (DAN) attenuates pressure-overload induced hypertrophic signaling through stabilization of tetrameric structure of cardiac ryanodine receptor (RyR2). Because cardiac hypertrophy substantially affects LV diastolic properties, we investigated the effect of DAN on LV diastolic properties in mineralocorticoid-salt–induced hypertensive rat model exhibiting the HFpEF phenotype.Male Sprague-Dawley (SD) rats (8 weeks old) received an uninephrectomy (UNX), subcutaneous implantation of a 200 mg pellet of deoxycorticosterone acetate (DOCA), and 0.9% NaCl water (UNX + DOCA-salt). UNX, a control pellet, and water without NaCl served as controls (UNX control). The effect of oral administration of 100 mg/kg/d DAN was examined in UNX control and UNX + DOCA-salt groups (UNX + DAN and UNX + DOCA-salt + DAN).UNX + DOCA-salt treatment resulted in mild hypertension. Chronic administration of DAN to UNX + DOCA-salt rats (UNX + DOCA-salt + DAN) did not affect blood pressure. DAN treatment increased the mitral annular early relaxation velocity in the UNX + DOCA-salt group. The size of cardiomyocytes increased in the UNX + DOCA-salt group, whereas the increase was suppressed by DAN treatment. LV fibrotic area was significantly smaller in the UNX + DOCA-salt + DAN group than in the UNX + DOCA-salt group (2.0 ± 0.2% vs 4.0 ± 0.4%). The LV chamber stiffness significantly increased in the UNX + DOCA-salt group, whereas the increase was suppressed by DAN treatment. DAN treatment normalized the CaM-RyR2 interaction and inhibited aberrant Ca2+ release.DAN improved left ventricular diastolic properties with respect to both myocardial relaxation and chamber stiffness. DAN may be a new treatment option for HFpEF.
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- 2023
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3. Long‐term events following catheter‐ablation for atrial fibrillation in heart failure with preserved ejection fraction
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Hironori Ishiguchi, Yasuhiro Yoshiga, Akihiko Shimizu, Takeshi Ueyama, Masakazu Fukuda, Takayoshi Kato, Shohei Fujii, Masahiro Hisaoka, Tomoyuki Uchida, Takuya Omuro, Takayuki Okamura, Shigeki Kobayashi, and Masafumi Yano
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Heart failure with preserved ejection fraction ,Catheter ablation ,Atrial fibrillation ,Major adverse clinical events ,Diseases of the circulatory (Cardiovascular) system ,RC666-701 - Abstract
Abstract Aims Data regarding prognostic events following catheter ablation (CA) for atrial fibrillation (AF) in patients with heart failure with preserved ejection fraction (HFpEF) are scarce. We conducted this study to compare the incidence of major adverse clinical events (MACE) following CA for AF between patients with HFpEF and those with systolic heart failure (HF). Methods and results This single‐centre observational study included 142 patients with HF who underwent CA for AF (median follow‐up: 4.0 [2.6, 6.3] years). The patients were grouped based on the presence of HFpEF (n = 84) and systolic HF (left ventricular ejection fraction
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- 2022
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4. The 1-minute sit-to-stand test to detect desaturation during 6-minute walk test in interstitial lung disease
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Keiji Oishi, Kazuto Matsunaga, Maki Asami-Noyama, Tasuku Yamamoto, Yukari Hisamoto, Tetsuya Fujii, Misa Harada, Junki Suizu, Keita Murakawa, Ayumi Chikumoto, Kazuki Matsuda, Haruka Kanesada, Yujiro Kikuchi, Kazuki Hamada, Sho Uehara, Ryo Suetake, Syuichiro Ohata, Yoriyuki Murata, Yoshikazu Yamaji, Kenji Sakamoto, Kosuke Ito, Hisayuki Osoreda, Nobutaka Edakuni, Tomoyuki Kakugawa, Tsunahiko Hirano, and Masafumi Yano
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Diseases of the respiratory system ,RC705-779 - Abstract
Abstract Although the 6 min walk test (6MWT) is well-established for assessing desaturation in patients with interstitial lung disease (ILD), it cannot be easily performed in primary healthcare settings. This retrospective observational study aimed to evaluate the usefulness of the 1 min sit-to-stand test (1STST) for assessing desaturation during 6MWT in ILD patients with normal resting blood oxygen levels. We included 116 patients, and the pulse oxygen saturation (SpO2) for both methods was analyzed. The SpO2 nadir during the 1STST and 6MWT correlated strongly (ρ = 0.82). The frequency of patients with nadir SpO2
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- 2022
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5. An impact of superior vena cava isolation in non‐paroxysmal atrial fibrillation patients with low voltage areas
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Takuya Omuro, Yasuhiro Yoshiga, Takeshi Ueyama, Akihiko Shimizu, Makoto Ono, Masakazu Fukuda, Takayoshi Kato, Hironori Ishiguchi, Shohei Fujii, Masahiro Hisaoka, Shigeki Kobayashi, and Masafumi Yano
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arrhythmia ,atrial fibrillation ,catheter ablation ,electrophysiology ,pulmonary vein isolation ,Diseases of the circulatory (Cardiovascular) system ,RC666-701 - Abstract
Abstract Background This study aimed to investigate the correlation between left atrial low‐voltage areas (LVAs) and an arrhythmogenic superior vena cava (SVC) and the impact on the efficacy of an empiric SVC isolation (SVCI) along with a pulmonary vein isolation (PVI) of non‐paroxysmal atrial fibrillation (non‐PAF) with or without LVAs. Methods We retrospectively enrolled 153 consecutive patients with non‐PAF who underwent a PVI alone (n = 51) or empiric PVI plus an SVCI (n = 102). Left atrial voltage maps were constructed during sinus rhythm to identify the LVAs (
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- 2021
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6. Herpud1 suppress angiotensin II induced hypertrophy in cardiomyocytes
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Mei Mikawa, Chihiro Sakai, Takeshi Yamamoto, Yoshihide Nakamura, Shinji Tanaka, Naoomi Tominaga, Masako Inamitsu, Tetsuro Oda, Shigeki Kobayashi, and Masafumi Yano
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Herpud1 ,Hypertrophy ,NFAT ,Biology (General) ,QH301-705.5 ,Biochemistry ,QD415-436 - Abstract
Purpose: The purpose of this study was to analyze the role of homocysteine-responsive endoplasmic reticulum-resident ubiquitin-like domain member 1 (Herpud1) gene in the development of cardiomyocyte hypertrophy. Method: In order to examine the effect of suppressing Herpud1 expression, Herpud1 small interfering RNA (siRNA) was introduced into H9C2 cells, which are cell lines derived from rat myocardium, and the degree of Herpud1 protein expression and cell hypertrophy in the Herpud1 siRNA-transfected group and the control group was compared by immunostaining 48 h after Herrpud1 siRNA introduction. To examine whether hypertrophy induced by angiotensin II (Ang II) can be suppressed by the overexpression of Herpud1, the green fluorescent protein (GFP)-Herpud1 plasmid was introduced into H9C2 cells, and the degree of cell hypertrophy was examined in the GFP-Herpud1-and control groups for 48 h. Nuclear translocation of nuclear factor of activated T-cells, cytoplasmic 4 (NFATc4), a transcription factor for hypertrophic genes, was also examined. Results: [1] Herpud1 siRNA-transfected cells showed decreased Herpud1 protein expression and hypertrophy formation compared to control cells [2]; Overexpression of Herpud1 suppresses Ang II-induced cell hypertrophy; and [3] Overexpression of Herpud1 inhibits nuclear translocation of NFATc4. Discussion: It was suggested that Herpud1 might be an anti-hypertrophic gene in Ang II induced cardiomyocytes hypertrophy.
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- 2022
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7. Computed Tomography Lung Density Analysis: An Imaging Biomarker Predicting Physical Inactivity in Chronic Obstructive Pulmonary Disease: A Pilot Study
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Yoriyuki Murata, Tsunahiko Hirano, Keiko Doi, Ayumi Fukatsu-Chikumoto, Kazuki Hamada, Keiji Oishi, Tomoyuki Kakugawa, Masafumi Yano, and Kazuto Matsunaga
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physical activity ,sedentary behavior ,density analysis ,Medicine - Abstract
Physical inactivity correlates with poor prognosis in chronic obstructive pulmonary disease (COPD) and is suggested to be related to lung hyperinflation. We examined the association between physical activity and the expiratory to inspiratory (E/I) ratio of mean lung density (MLD), the imaging biomarker of resting lung hyperinflation. COPD patients (n = 41) and healthy controls (n = 12) underwent assessment of pulmonary function and physical activity with an accelerometer, as well as computed tomography at full inspiration and expiration. E/IMLD was calculated by measuring inspiratory and expiratory MLD. Exercise (EX) was defined as metabolic equivalents × duration (hours). COPD patients had higher E/IMLD (0.975 vs. 0.964) than healthy subjects. When dividing COPD patients into sedentary (EX < 1.5) and non-sedentary (EX ≥ 1.5) groups, E/IMLD in the sedentary group was statistically higher than that in the non-sedentary group (0.983 vs. 0.972). E/IMLD > 0.980 was a good predictor of sedentary behavior in COPD (sensitivity, 0.815; specificity, 0.714). Multivariate analysis showed that E/IMLD was associated with sedentary behavior (odds ratio, 0.39; p = 0.04), independent of age, symptomology, airflow obstruction, and pulmonary diffusion. In conclusion, higher E/IMLD scores are associated with sedentary behavior and can be a useful imaging biomarker for the early detection of physical inactivity in COPD.
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- 2023
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8. Enhancing calmodulin binding to ryanodine receptor is crucial to limit neuronal cell loss in Alzheimer disease
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Yoshihide Nakamura, Takeshi Yamamoto, Xiaojuan Xu, Shigeki Kobayashi, Shinji Tanaka, Masaki Tamitani, Takashi Saito, Takaomi C. Saido, and Masafumi Yano
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Medicine ,Science - Abstract
Abstract Alzheimer’s disease (AD) is a neurodegenerative disorder characterized by progressive neuronal cell loss. Recently, dysregulation of intracellular Ca2+ homeostasis has been suggested as a common proximal cause of neural dysfunction in AD. Here, we investigated (1) the pathogenic role of destabilization of ryanodine receptor (RyR2) in endoplasmic reticulum (ER) upon development of AD phenotypes in App NL-G-F mice, which harbor three familial AD mutations (Swedish, Beyreuther/Iberian, and Arctic), and (2) the therapeutic effect of enhanced calmodulin (CaM) binding to RyR2. In the neuronal cells from App NL-G-F mice, CaM dissociation from RyR2 was associated with AD-related phenotypes, i.e. Aβ accumulation, TAU phosphorylation, ER stress, neuronal cell loss, and cognitive dysfunction. Surprisingly, either genetic (by V3599K substitution in RyR2) or pharmacological (by dantrolene) enhancement of CaM binding to RyR2 reversed almost completely the aforementioned AD-related phenotypes, except for Aβ accumulation. Thus, destabilization of RyR2 due to CaM dissociation is most likely an early and fundamental pathogenic mechanism involved in the development of AD. The discovery that neuronal cell loss can be fully prevented simply by stabilizing RyR2 sheds new light on the treatment of AD.
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- 2021
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9. Crystal structure of tris[4-(naphthalen-1-yl)phenyl]amine
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Masafumi Yano, Yukiyasu Kashiwagi, Yoshinori Inada, Yuki Hayashi, Koichi Mitsudo, and Koji Kubono
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crystal structure ,triarylamine ,hole transporter ,organic electronics ,electroluminescence ,Crystallography ,QD901-999 - Abstract
In the title molecule, C48H33N, the central N atom shows no pyramidalization, so that the N atom and the three C atoms bound to the N atom lie almost in the same plane. The three para-phenylene rings bonded to the N atom are in a propeller form. All of the naphthalene ring systems are slightly bent. In the crystal, molecules form an inversion dimer, through two pairs of C—H...π interactions, which further interacts with the adjacent dimer via another two pairs of C—H...π interactions, forming a column structure along the a axis. There are no significant interactions between these column structures.
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- 2020
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10. Impact of Atrial Tachyarrhythmia Recurrence on the Development of Long‐Term Adverse Clinical Events Following Catheter Ablation in Patients With Atrial Fibrillation With Systolic Impairment: A Single‐Center Observational Study
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Hironori Ishiguchi, Yasuhiro Yoshiga, Akihiko Shimizu, Takeshi Ueyama, Makoto Ono, Masakazu Fukuda, Takayoshi Kato, Shohei Fujii, Masahiro Hisaoka, Tomoyuki Uchida, Takuya Omuro, Mototsugu Shimokawa, Takayuki Okamura, Shigeki Kobayashi, and Masafumi Yano
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atrial fibrillation ,atrial tachyarrhythmia recurrence ,catheter ablation ,heart failure ,Diseases of the circulatory (Cardiovascular) system ,RC666-701 - Abstract
Background Catheter ablation can improve long‐term prognosis of patients with atrial fibrillation with systolic impairment. However, atrial tachyarrhythmia (ATA) recurrence increases during long‐term follow‐up. We aimed to investigate the impact of ATA recurrence on the development of long‐term adverse clinical events following catheter ablation for atrial fibrillation and to identify predictors for the development of adverse clinical events. Methods and Results This single‐center observational study included 75 patients with systolic impairment (left ventricular ejection fraction
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- 2022
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11. Glomerulonephritis and Interstitial Nephritis Originating from Vasculitis of the Interlobular Arteries of the Kidney in a Patient with Eosinophilic Granulomatosis with Polyangiitis
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Takashi Nawata, Masaki Shibuya, Yukio Takeshita, Makoto Kubo, Noriko Uesugi, and Masafumi Yano
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Diseases of the musculoskeletal system ,RC925-935 - Abstract
Eosinophilic granulomatosis with polyangiitis (EGPA) is a type of antineutrophil cytoplasmic antibody-associated vasculitis. Patients often present with peripheral neuropathy and purpura, suggesting impairment of small vessels, especially capillaries. However, medium-sized vessels and small vessels with a vascular diameter larger than that of capillaries may also be impaired, causing atypical findings. We report a case of EGPA treated with corticosteroids, cyclophosphamide, and mepolizumab. Renal biopsy revealed vasculitis of the interlobular arteries as the cause of glomerulonephritis and interstitial nephritis. This case suggests the importance of considering vessels upstream of capillaries dominant EGPA as a differential diagnosis in patients with eosinophilia.
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- 2022
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12. Feasibility, reproducibility and characteristics of coronary bifurcation type assessment by three-dimensional optical coherence tomography
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Takashi Nishimura, Takayuki Okamura, Tatsuhiro Fujimura, Yosuke Miyazaki, Hitoshi Takenaka, Hideaki Akase, Hiroki Tateishi, Mamoru Mochizuki, Hitoshi Uchinoumi, Tetsuro Oda, and Masafumi Yano
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Medicine ,Science - Abstract
Aim To investigate the characteristics of coronary artery bifurcation type (parallel or perpendicular type) using three-dimensional (3D) optical coherence tomography (OCT), and determine the feasibility, reproducibility, assessment time and correlation with bifurcation angles measured by 3D quantitative coronary angiography (QCA). Methods and results We evaluated 60 lesions at the coronary bifurcation that were treated by main vessel (MV) stenting with kissing balloon inflation (KBI) under OCT/optical frequency domain imaging (OFDI) guidance. Inter- and intra-observer agreement regarding the assessment of 3D bifurcation types were 0.88 and 0.94, respectively. The assessment times of 3D-OCT bifurcation type with OCT and OFDI were within about 30 seconds. 3D-OCT bifurcation types showed the greatest correlation with the distal bifurcation angle assessed by 3D-QCA among the three bifurcation angles (distal bifurcation angle, proximal bifurcation angle and main vessel angle), and the optimal cut-off distal bifurcation angle to predict a perpendicular type bifurcation, as determined by ROC analysis, was 51.0° (AUC 0.773, sensitivity 0.80, specificity 0.67). Based on this cut-off value for the distal bifurcation angle (51°), the diagnostic accuracy for perpendicular type bifurcation in cases with a BA ≥ 51° (n = 34) was 70.6% (24/34) and that of the parallel type bifurcation in cases of BA < 51° (n = 26) was 76.9% (20/26). Conclusion Performing 3D-OCT for assessment of coronary artery bifurcation type is feasible and simple, and can be done in a short time with high reproducibility.
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- 2022
13. Anti-neutrophil cytoplasmic antibody–associated vasculitis complicated with diffuse alveolar haemorrhage and central nervous system vasculitis
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Takashi Nawata, Kaori Murakawa, Kosaku Shiragami, Masaki Shibuya, Makoto Kubo, and Masafumi Yano
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Medicine (General) ,R5-920 - Abstract
Diffuse alveolar haemorrhage and central nervous system vasculitis are life-threatening complications of anti-neutrophil cytoplasmic antibody-associated vasculitis. The simultaneous occurrence of diffuse alveolar haemorrhage and central nervous system vasculitis is a rare presentation of antibody-associated vasculitis. Its diagnosis by histopathology is difficult because biopsy is difficult to perform, and urgent treatment is needed. We report a case of a Japanese man with diffuse alveolar haemorrhage and central nervous system vasculitis associated with antibody-associated vasculitis. New classification criteria may be needed for diffuse alveolar haemorrhage and central nervous system vasculitis associated with systemic vasculitis. When antibiotic-resistant atypical bilateral pneumonia is noted in the acute phase of a cerebral stroke, with elements suggestive of vasculitis, clinicians should be aware that diffuse alveolar haemorrhage and central nervous system vasculitis may occur simultaneously.
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- 2021
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14. A cell model in the ventral visual pathway for the detection of circles of curvature constituting figures
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Susumu Kawakami, Takehiro Ito, Yoshinari Makino, Makoto Hashimoto, and Masafumi Yano
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Cell model ,Curvature-circle detection ,3D normal-line transform ,Column ,Coarse-to-fine extraction ,Cell-array conversion ,Science (General) ,Q1-390 ,Social sciences (General) ,H1-99 - Abstract
The contour of an arbitrary figure can be represented as a group of circles of curvature in contact with it, with each curvature circle represented by its center OC and radius r. We propose a series of cell models for detecting this circle, which is composed of a lateral geniculate nucleus (LGN) cell, nondirectionally selective (NDS) simple cell, and curvature-circle detection cell (CDC). The LGN and NDS simple cells were previously modeled. The CDC has been modeled as follows. Each tangent in contact with this circle is detected by an NDS simple cell that performs the Hough transformation of LGN cell responses, and then this tangent is transformed to a three-dimensional (3D) normal line in a CDC column. This transformation has been named a 3D normal-line transform. Performing this transformation for all tangents causes a CDC at the intersection of these normal lines to fire most intensively, and thus the OC and r of the circle is detected as the coordinates of this intersection. Therefore, the CDC has been modeled as this 3D normal-line transform. Based on this CDC, we model two types of constancy CDC: a position-invariant CDC and a curvature-invariant CDC. These three types of CDC reflect the response to various stimuli in actual area V4 cells. In order to validate these CDC types neurophysiologically, we propose an experimental method using microelectrodes. Cell models previously reported correspond to this hierarchy: the S1, S2, and C2 cells correspond to the NDS simple cell, CDC, and position-invariant CDC, respectively.
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- 2020
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15. The Differential Prognostic Impact of Long-Duration Atrial High-Rate Episodes Detected by Cardiac Implantable Electronic Devices between Patients with and without a History of Atrial Fibrillation
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Hironori Ishiguchi, Yasuhiro Yoshiga, Akihiko Shimizu, Takeshi Ueyama, Makoto Ono, Masakazu Fukuda, Takayoshi Kato, Shohei Fujii, Masahiro Hisaoka, Tomoyuki Uchida, Takuya Omuro, Takayuki Okamura, Shigeki Kobayashi, and Masafumi Yano
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atrial high-rate episode ,major adverse cardiovascular event ,cardiac implantable electronic device ,prognostic value ,long-duration AHRE ,Medicine - Abstract
Long-duration atrial high-rate episodes (AHREs) monitored using cardiac implantable electronic devices (CIEDs) can predict long-term major adverse cardiovascular events (MACEs). This study aimed to compare the impact of long-duration AHRE on MACE development between patients with and without a history of atrial fibrillation (AF). This single-center observational study included 132 CIED-implanted patients with AHREs detected via remote monitoring. The population was dichotomized into groups: with (n = 69) and without (n = 63) AF. In each group, cumulative incidences of MACEs comprising all-cause deaths, heart failure hospitalizations, strokes, and acute coronary syndromes were compared between patients with AHRE durations of ≥24 h and p = 0.005). MACE incidence did not significantly differ between AHRE ≥24 h and p = 0.44). After a multivariate adjustment, AHRE duration of ≥24 h emerged as the only independent predictor of MACEs among patients without AF (p = 0.03). In conclusion, a long-duration AHRE was prognostic in patients without a history of AF but not in patients with a history of AHREs.
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- 2022
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16. Author Correction: The 1-minute sit-to-stand test to detect desaturation during 6-minute walk test in interstitial lung disease
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Keiji Oishi, Kazuto Matsunaga, Maki Asami-Noyama, Tasuku Yamamoto, Yukari Hisamoto, Tetsuya Fujii, Misa Harada, Junki Suizu, Keita Murakawa, Ayumi Chikumoto, Kazuki Matsuda, Haruka Kanesada, Yujiro Kikuchi, Kazuki Hamada, Sho Uehara, Ryo Suetake, Syuichiro Ohata, Yoriyuki Murata, Yoshikazu Yamaji, Kenji Sakamoto, Kosuke Ito, Hisayuki Osoreda, Nobutaka Edakuni, Tomoyuki Kakugawa, Tsunahiko Hirano, and Masafumi Yano
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Diseases of the respiratory system ,RC705-779 - Published
- 2022
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17. Dantrolene prevents hepatic steatosis by reducing cytoplasmic Ca2+ level and ER stress
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Masaki Tamitani, Takeshi Yamamoto, Naoki Yamamoto, Koichi Fujisawa, Shinji Tanaka, Yoshihide Nakamura, Hitoshi Uchinoumi, Tetsuro Oda, Shinichi Okuda, Taro Takami, Shigeki Kobayashi, Isao Sakaida, and Masafumi Yano
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Non-alcoholic fatty liver disease ,Dantrolene ,Palmitic acid ,Biology (General) ,QH301-705.5 ,Biochemistry ,QD415-436 - Abstract
Introduction: Our previous studies demonstrated that dantrolene, a ryanodine receptor stabilizer, prevents endoplasmic reticulum (ER) stress in the heart. ER stress is a strong mediator of impaired lipid metabolism in the liver, thereby contributing to fatty liver disease. In this study, we investigated the effects of dantrolene on fatty liver disease in mice and ER stress in hepatocytes. Methods and results: Eight weeks old C57BL/6 mice were fed high-fat diet (HFD) for 8 weeks with or without the oral administration of dantrolene (100 mg/kg/day). The livers of mice without dantrolene (HFD group) showed severe fatty liver, whereas the livers of the mice treated with dantrolene (HFD + DAN group) only showed slightly fatty liver. To address the preventive effects of dantrolene, primary hepatocytes were cultured with palmitate in the presence or absence of dantrolene. Dantrolene reduced lipid load and prevents palmitate-induced increase in cytoplasmic Ca2+ and ER stress. Based on these findings, we propose that dantrolene is a potential new therapeutic agent against fatty liver disease.
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- 2020
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18. G790del mutation in DSC2 alone is insufficient to develop the pathogenesis of ARVC in a mouse model
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Yoriomi Hamada, Takeshi Yamamoto, Yoshihide Nakamura, Yoko Sufu-Shimizu, Takuma Nanno, Masakazu Fukuda, Makoto Ono, Tesuro Oda, Shinichi Okuda, Takeshi Ueyama, Shigeki Kobayashi, and Masafumi Yano
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Biology (General) ,QH301-705.5 ,Biochemistry ,QD415-436 - Abstract
Background: Arrhythmogenic right ventricular cardiomyopathy (ARVC) is an inherited heart disease that causes heart failure and/or sudden cardiac death. Several desmosomal genes (DSC2, PKG, PKP2, DSP, and RyR2) are thought to be the causative gene involved in ARVC. Out of them, DSC2 mutations account for 2% of ARVC genetic abnormalities. This study aimed to clarify the effect of G790del mutation in DSC2 on the arrhythmogenic mechanism and cardiac function in a mouse model. Result: Neither the heterozygous +/G790del nor homozygous G790del/G790del mice showed structural and functional defects in the right ventricle (RV) or lethal arrhythmia. The homozygous G790del/G790del 6-month-old mice slightly showed left ventricular (LV) dysfunction. Cell shortening decreased with prolongation of intracellular Ca2+ transient in cardiomyocytes isolated from the homozygous G790del/G790del mice, and spontaneous Ca2+ transients were frequently observed in response to isoproterenol. Conclusions: G790del mutation in DSC2 was not relevant to the pathogenesis of ARVC, but showed a slight contractile dysfunction and Ca2+ dysregulation in the LV. Keywords: Desmocollin-2 (DSC2), Arrhythmogenic right ventricular cardiomyopathy (ARVC)
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- 2020
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19. P68 Usefulness of an Optimal Cut-off in Central Augmentation Pressure for the Detection of Left Ventricular Hypertrophy in Men
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Masakazu Obayashi, Shigeki Kobayashi, Hirotaka Yamamoto, Yoriomi Hamada, Takumi Nanno, Michihiro Kohno, and Masafumi Yano
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Specialties of internal medicine ,RC581-951 ,Diseases of the circulatory (Cardiovascular) system ,RC666-701 - Abstract
Background: Recently, we showed an age-related increase in augmentation pressure (AP) measured using Mobil-O-Graph (MOG) in normotensive Japanese individuals. However, AP might be a poor index of wave reflection due to the overlap between the forward wave and reflected wave. Methods: We enrolled untreated hypertensive patients and patients currently on antihypertensive treatment. For 70 patients (median age, 70.5 years; 34 men), M-mode echocardiography was performed for determination of left ventricular hypertrophy (LVH), while hemodynamic measurements were taken using MOG. We investigated the influence of central hemodynamic parameters on LVH. Results: Spearman correlation coefficients between various parameters [age, height, systolic blood pressure (SBP), mean BP, diastolic BP, central systolic BP (cSBP), and AP] were calculated for LV mass indexed to body surface area (LVMI; g/m2). In men, age (r = 0.600, p = 0.0002), height (r = −0.495, p = 0.003), SBP (r = 0.423, p = 0.013), cSBP (r = 0.454, p = 0.007), and AP (r = 0.661, p < 0.0001) were correlated to LVMI. In women, cSBP (r = 0.334, p = 0.044) and AP (r = 0.480, p = 0.003) were correlated to LVMI. In men, LVMI (R2 = 0.578, p = 0.0001) was significantly associated with AP (β = 1.32 ± 0.56, p = 0.027) in multivariate regression analysis. In women, no significant independent parameter for LVMI was observed. ROC curve analysis was performed to estimate the utility of AP for the detection of LVH (LVMI >115 g/m2) in men. Area under the ROC curve was 0.83 (95% CI: 0.68–0.99). The optimal cut-off point of 12.5 mmHg produced 79.0% sensitivity and 86.7% specificity. Conclusion: Higher AP showing >12.5 mmHg calculated by MOG was a significant independent predictor of LVH in male hypertensive patients.
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- 2020
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20. Change in muscle volume after steroid therapy in patients with myositis assessed using cross-sectional computed tomography
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Takashi Nawata, Makoto Kubo, Takafumi Nomura, Keiji Oishi, Kosaku Shiragami, Tadayoshi Ikegami, Munemasa Okada, Shigeki Kobayashi, and Masafumi Yano
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Computed tomography ,Cross section ,Steroid ,Muscle mass ,Myositis ,Diseases of the musculoskeletal system ,RC925-935 - Abstract
Abstract Background Steroid therapy, a key therapy for inflammatory, allergic, and immunological disorders, is often associated with steroid myopathy as one of the side effects. Steroid therapy is considered the first-line therapy for myositis; however, there have been no reports strictly comparing the muscle mass in patients with myositis before and after steroid therapy. Thus, it is currently unclear whether steroid therapy for such patients affects muscle volume in addition to muscle strength. We aimed to determine the change in muscle mass after steroid therapy via cross-sectional computed tomography (CT) in patients with myositis. Methods Data from seven patients with myositis and eight controls, who were all treated with high doses of steroids, were assessed before and after steroid therapy. Clinical factors in patients with myositis included serum muscle enzyme levels and muscular strength. The cross-sectional area of skeletal muscle and the low muscle attenuation rate at the level of the caudal end of the third lumbar vertebra were obtained using CT and measured using an image analysis program for all patients. Data were subjected to statistical analysis using several well-established statistical tests. The Wilcoxon signed-rank test was used for comparing paired data for each patient. The Mann-Whitney U test was used to compare sets of data sampled from two groups. The Spearman’s rank correlation coefficient was used for determining the correlations between two variables. Statistical significance was set at p
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- 2018
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21. Macroreentrant form of an adenosine 5′-triphosphate–sensitive atrial tachycardia arising from the vicinity of the atrioventricular node involving the tricuspid and mitral annuli as its reentrant circuit
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Takeshi Ueyama, MD, PhD, Akihiko Shimizu, MD, PhD, Yasuhiro Yoshiga, MD, PhD, Makoto Ono, MD, PhD, Tomoko Fumimoto, MD, and Masafumi Yano, MD, PhD
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Adenosine 5′-triphosphate ,Atrial tachycardia ,Catheter ablation ,Entrainment ,Macroreentry ,Diseases of the circulatory (Cardiovascular) system ,RC666-701 - Published
- 2017
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22. The new era of atrial fibrillation treated by direct oral anticoagulants and catheter ablation—Comment on the 'HAF‐NET Registry'
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Yasuhiro Yoshiga, Akihiko Shimizu, and Masafumi Yano
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Diseases of the circulatory (Cardiovascular) system ,RC666-701 - Published
- 2019
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23. Medication persistence rates and predictive factors for discontinuation of antifibrotic agents in patients with idiopathic pulmonary fibrosis: a real-world observational study
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Keiji Oishi, Tsunahiko Hirano, Yoriyuki Murata, Kazuki Hamada, Sho Uehara, Ryo Suetake, Yoshikazu Yamaji, Maki Asami-Noyama, Nobutaka Edakuni, Syuichiro Ohata, Toshiaki Utsunomiya, Kenji Sakamoto, Hideko Onoda, Tsuneo Matsumoto, Kazuto Matsunaga, and Masafumi Yano
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Diseases of the respiratory system ,RC705-779 - Abstract
Background: In patients with idiopathic pulmonary fibrosis (IPF), continuing treatment with antifibrotic agents is crucial to decrease the reduction of forced vital capacity and mortality rate. However, predictive factors for the discontinuation of antifibrotic agents are unknown. This study aims to investigate the clinical characteristics and predictive factors for the discontinuation of antifibrotic agents in patients with IPF. Methods: This was a double-center retrospective study that enrolled patients with IPF treated with pirfenidone or nintedanib between 2009 and 2017. We compared clinical parameters between the medication-continuing group and the discontinued group. The predictive factors were determined using Cox proportional hazards analyses. Results: A total of 66 subjects were included: 43 received pirfenidone and 23 received nintedanib. At 1 year, 23 of 66 patients had discontinued due to adverse events ( n = 12), disease progression ( n = 9), or death ( n = 2). The characteristics of the discontinuation group were poor performance status (PS) and delay from diagnosis to treatment. In the receiver operating characteristic (ROC) analysis associated with the discontinuation of antifibrotic agents, PS was the highest area under the ROC curve (AUC) value (cut-off value, 2; AUC, 0.83; specificity, 63%; sensitivity, 87%). This finding was consistent even when analyzing, except for examples of death and adjusting for the type of antifibrotic agent. The treatment persistence rate by PS was PS 0–1 = 90%, PS 2 = 65%, and PS 3 = 19%. Analysis of the relationship between PS and administration period of antifibrotic agents revealed that delays from diagnosis to treatment led to worsening of dyspnea, a decline in lung function, and deterioration of PS. Conclusions: PS may be informative for predicting discontinuation of medication. Our data reinforced the importance of early initiation of antifibrotic treatment, and we suggest PS should be used as a guide for starting antifibrotic agents in everyday practice. The reviews of this paper are available via the supplementary material section.
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- 2019
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24. Successful cryoballoon pulmonary vein isolation in a patient with situs inversus and dextrocardia
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Yasuhiro Yoshiga, MD, Akihiko Shimizu, MD, Takeshi Ueyama, MD, Makoto Ono, MD, Tomoko Fumimoto, MD, Hironori Ishiguchi, MD, and Masafumi Yano, MD
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Atrial fibrillation ,Catheter ablation ,Pulmonary vein isolation ,Cryoballoon ,Dextrocardia ,Diseases of the circulatory (Cardiovascular) system ,RC666-701 - Abstract
A 79-year-old man with situs inversus and dextrocardia underwent catheter ablation of symptomatic paroxysmal atrial fibrillation. Pulmonary vein isolation (PVI), using second-generation cryoballoon under Ensite NavX system guidance, was performed successfully in a reverse manner, which required short procedure and fluoroscopy times, as required in a PVI performed on a normal heart without any complications. Cryoballoon-based PVI under Ensite NavX guidance was feasible and safe to achieve a favorable outcome in this patient with abnormal anatomy.
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- 2016
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25. P128 COMPARISON OF AUGMENTATION INDEX OBTAINED FROM HEM-9000AI AND MOBIL-O-GRAPH IN JAPANESE NORMOTENSIVE INDIVIDUALS
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Masakazu Obayashi, Michihiro Kohno, Shigeki Kobayashi, Michiaki Kohno, and Masafumi Yano
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Specialties of internal medicine ,RC581-951 ,Diseases of the circulatory (Cardiovascular) system ,RC666-701 - Abstract
Background: HEM-9000AI (HEM) is an established device for measurement of radial augmentation index (rAIx) used by applanation tonometry in Japan. Mobil-O-Graph (MOG) is a cuff-based oscillometric device for assessment of central aortic AIx (cAIx) and the usefulness to Europeans has been reported. We compared the AIx between HEM and MOG in Japanese normotensive subjects. Methods: We enrolled 106 normotensive volunteers (47 male, 21 to 79 years). The left radial arterial waveform was recorded with the HEM. MOG were taken on the left arms, which arm circumferences (ACs) were measured to allow the correct choice of cuff (two sizes available; 20–24 and 24–32 cm). We performed multiple regressions for AIx and key variables in HEM and MOG. Results: The ACs in M and F were 25.7±1.9 (mean±SD) cm and 23.5±2.1cm, respectively. Both rAIx (70.5±15.3% vs 83.6±11.9%, p < 0.001) and cAIx (17.2±7.3% vs 29.7±9.8%, p < 0.001) in M were smaller than those in F. Multiple regression analysis revealed that cAIx in M (R2 = 0.5176) was significantly associated with age (β = 0.17, p = 0.004) and cuff size (p = 0.001). cAIx obtained using the smaller cuff was significantly increased compared to the larger cuff (25.1±5.9% vs 14.8±5.9%). In F, cAIx (R2 = 0.2245) tended to be associated with age (β = 0.16, p = 0.072) and was significantly associated with height (β = −0.62, p = 0.007) and heart rate (β = −0.26, p = 0.0029). Conclusions: The brachial cuff-based waveform recordings are useful for Japanese normotensive individuals. However, the mean AC is close to the bound of two cuff sizes and the measurement of lower cAx using the larger cuff is less sensitive.
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- 2017
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26. Shape Retrieval With Geometrically Characterized Contour Partitions
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Yuma Matsuda, Masatsugu Ogawa, and Masafumi Yano
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shape recognition ,shape retrieval ,occlusion ,curvature partition ,geometric parameter ,Electrical engineering. Electronics. Nuclear engineering ,TK1-9971 - Abstract
This paper proposes a new computational method for retrieving shapes under unpredictable conditions such as when occlusion, geometric distortion, and differences in image resolution occur simultaneously. The human visual system retrieves shapes from incomplete information in the real world, and it has inspired a lot of computational methods of retrieving shapes. In order to retrieve shapes, the observed shapes are decided to be alike or unlike remembered shapes in memory after the comparison of these shapes. To compare the observed and remembered shapes, they must first be appropriately represented so that the points on each shape can be mapped and compared. For this reason, the shape retrieval process needs an appropriate shape representation and shape mapping methods. Moreover, the shape representations should be normalized before the mapping process. However, a normalization process for representations under unpredictable conditions has not yet been established. In this paper, we describe a shape retrieval method that enables us to retrieve shapes under unpredictable conditions with a suitable normalization process. Using curvature partition and angle-length profile, our shape retrieval method normalizes the shape representation before it does the mapping. As a result, unlike the previously proposed methods, it can be used under unpredictable conditions such as when occlusion, geometric distortion, and differences in image resolution occur simultaneously.
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- 2015
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27. Successful Treatment of Hemophagocytic Lymphohistiocytosis Associated with Lupus Nephritis by Using Mycophenolate Mofetil
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Takashi Nawata, Makoto Kubo, Kosaku Shiragami, Yukinori Nakamura, and Masafumi Yano
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Diseases of the musculoskeletal system ,RC925-935 - Abstract
An estimated 0.9% to 2.4% of patients with systemic lupus erythematosus (SLE) also have hemophagocytic lymphohistiocytosis (HLH). HLH associated with autoimmune diseases is often refractory to corticosteroid treatment; thus, additional immunosuppressive drugs, such as cyclosporine, cyclophosphamide, or tacrolimus, are required. Here, we describe the case of a 44-year-old Japanese woman who developed HLH associated with lupus nephritis. Initially, her HLH was refractory to treatment with a corticosteroid, tacrolimus, and mizoribine. However, alternative treatment with a corticosteroid, mycophenolate mofetil, and tacrolimus improved both her HLH and lupus nephritis. This case suggests the possibility of mycophenolate mofetil as a key drug for treating HLH associated with SLE.
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- 2017
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28. Recombinant Atrial Natriuretic Peptide Prevents Aberrant Ca2+ Leakage through the Ryanodine Receptor by Suppressing Mitochondrial Reactive Oxygen Species Production Induced by Isoproterenol in Failing Cardiomyocytes.
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Wakako Murakami, Shigeki Kobayashi, Takehisa Susa, Takuma Nanno, Hironori Ishiguchi, Takeki Myoren, Shigehiko Nishimura, Takayoshi Kato, Akihiro Hino, Tetsuro Oda, Shinichi Okuda, Takeshi Yamamoto, and Masafumi Yano
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Medicine ,Science - Abstract
Catecholamines induce intracellular reactive oxygen species (ROS), thus enhancing diastolic Ca2+ leakage through the ryanodine receptor during heart failure (HF). However, little is known regarding the effect of atrial natriuretic peptide (ANP) on ROS generation and Ca2+ handling in failing cardiomyocytes. The aim of the present study was to clarify the mechanism by which an exogenous ANP exerts cardioprotective effects during HF. Cardiomyocytes were isolated from the left ventricles of a canine tachycardia-induced HF model and sham-operated vehicle controls. The degree of mitochondrial oxidized DNA was evaluated by double immunohistochemical (IHC) staining using an anti-VDAC antibody for the mitochondria and an anti-8-hydroxy-2'-deoxyguanosine antibody for oxidized DNA. The effect of ANP on ROS was investigated using 2,7-dichlorofluorescin diacetate, diastolic Ca2+ sparks assessed by confocal microscopy using Fluo 4-AM, and the survival rate of myocytes after 48 h. The double IHC study revealed that isoproterenol (ISO) markedly increased oxidized DNA in the mitochondria in HF and that the ISO-induced DNA damage was markedly inhibited by the co-presence of ANP. ROS production and Ca2+ spark frequency (CaSF) were increased in HF compared to normal controls, and were further increased in the presence of ISO. Notably, ANP significantly suppressed both ISO-induced ROS and CaSF without changing sarcoplasmic reticulum Ca2+ content in HF (p
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- 2016
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29. A low-dose β1-blocker in combination with milrinone improves intracellular Ca2+ handling in failing cardiomyocytes by inhibition of milrinone-induced diastolic Ca2+ leakage from the sarcoplasmic reticulum.
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Shigeki Kobayashi, Takehisa Susa, Hironori Ishiguchi, Takeki Myoren, Wakako Murakami, Takayoshi Kato, Masakazu Fukuda, Akihiro Hino, Takeshi Suetomi, Makoto Ono, Hitoshi Uchinoumi, Hiroki Tateishi, Mamoru Mochizuki, Tetsuro Oda, Shinichi Okuda, Masahiro Doi, Takeshi Yamamoto, and Masafumi Yano
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Medicine ,Science - Abstract
OBJECTIVES:The purpose of this study was to investigate whether adding a low-dose β1-blocker to milrinone improves cardiac function in failing cardiomyocytes and the underlying cardioprotective mechanism. BACKGROUND:The molecular mechanism underlying how the combination of low-dose β1-blocker and milrinone affects intracellular Ca(2+) handling in heart failure remains unclear. METHODS:We investigated the effect of milrinone plus landiolol on intracellular Ca(2+) transient (CaT), cell shortening (CS), the frequency of diastolic Ca(2+) sparks (CaSF), and sarcoplasmic reticulum Ca(2+) concentration ({Ca(2+)}SR) in normal and failing canine cardiomyocytes and used immunoblotting to determine the phosphorylation level of ryanodine receptor (RyR2) and phospholamban (PLB). RESULTS:In failing cardiomyocytes, CaSF significantly increased, and peak CaT and CS markedly decreased compared with normal myocytes. Administration of milrinone alone slightly increased peak CaT and CS, while CaSF greatly increased with a slight increase in {Ca(2+)}SR. Co-administration of β1-blocker landiolol to failing cardiomyocytes at a dose that does not inhibit cardiomyocyte function significantly decreased CaSF with a further increase in {Ca(2+)}SR, and peak CaT and CS improved compared with milrinone alone. Landiolol suppressed the hyperphosphorylation of RyR2 (Ser2808) in failing cardiomyocytes but had no effect on levels of phosphorylated PLB (Ser16 and Thr17). Low-dose landiolol significantly inhibited the alternans of CaT and CS under a fixed pacing rate (0.5 Hz) in failing cardiomyocytes. CONCLUSION:A low-dose β1-blocker in combination with milrinone improved cardiac function in failing cardiomyocytes, apparently by inhibiting the phosphorylation of RyR2, not PLB, and subsequent diastolic Ca(2+) leak.
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- 2015
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30. Incidence of Mid-Term Prognostic Events in Patients With Acute Coronary Syndrome During the Late 2010s in 2 Tertiary Hospitals in a Rural Area of Japan ― A Temporal Comparison ―
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Yu Yasuda, Hironori Ishiguchi, Madoka Yamaguchi, Kei Murakami, Natsu Kinoshita, Takayoshi Kato, Masaaki Yoshida, Koji Imoto, Kazuhiko Sonoyama, Tetsuya Kawabata, Takayuki Okamura, Akihiro Endo, Shigeki Kobayashi, Masafumi Yano, Tsuyoshi Oda, and Kazuaki Tanabe
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General Medicine - Published
- 2023
31. RyR2-targeting therapy prevents left ventricular remodeling and ventricular tachycardia in post-infarction heart failure
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Shohei Fujii, Shigeki Kobayashi, Yaowei Chang, Junya Nawata, Ryosuke Yoshitomi, Shinji Tanaka, Michiaki Kohno, Yoshihide Nakamura, Hironori Ishiguchi, Takeshi Suetomi, Hitoshi Uchinoumi, Tetsuro Oda, Shinichi Okuda, Takayuki Okamura, Takeshi Yamamoto, and Masafumi Yano
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Cardiology and Cardiovascular Medicine ,Molecular Biology - Published
- 2023
32. Herpud1 modulates hypertrophic signals independently of calmodulin nuclear translocation in rat myocardium-derived H9C2 cells
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Riko Fujioka, Takeshi Yamamoto, Akihiro Maruta, Yoshihide Nakamura, Naoomi Tominaga, Masako Inamitsu, Tetsuro Oda, Shigeki Kobayashi, and Masafumi Yano
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Biophysics ,Cell Biology ,Molecular Biology ,Biochemistry - Published
- 2023
33. Stabilizing cardiac ryanodine receptor with dantrolene treatment prevents left ventricular remodeling in pressure-overloaded heart failure mice
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Yasutake Yano, Shigeki Kobayashi, Tomoyuki Uchida, Yaowei Chang, Junya Nawata, Shohei Fujii, Yoshihide Nakamura, Takeshi Suetomi, Hitoshi Uchinoumi, Tetsuro Oda, Takeshi Yamamoto, and Masafumi Yano
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Biophysics ,Cell Biology ,Molecular Biology ,Biochemistry - Abstract
Dantrolene (DAN) directly binds to cardiac ryanodine receptor 2 (RyR2) through Leu
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- 2023
34. Complexity Reduction of Neural Network Model for Local Motion Detection in Motion Stereo Vision.
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Hisanao Akima, Susumu Kawakami, Jordi Madrenas, Satoshi Moriya, Masafumi Yano, Koji Nakajima, Masao Sakuraba, and Shigeo Sato
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- 2017
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35. Features and Outcomes of Histologically Proven Myocarditis With Fulminant Presentation
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Koshiro Kanaoka, Kenji Onoue, Satoshi Terasaki, Tomoya Nakano, Michikazu Nakai, Yoko Sumita, Kinta Hatakeyama, Fumio Terasaki, Rika Kawakami, Yoshitaka Iwanaga, Yoshihiro Miyamoto, Yoshihiko Saito, Satoshi Yuda, Masaya Tanno, Toru Takahashi, Hisashi Yokoshiki, Masahiro Toba, Toshihisa Anzai, Toshiyuki Nagai, Takuma Sato, Takashi Takenaka, Seiji Yamazaki, Yuki Katagiri, Toshiharu Takeuchi, Kazuya Sugitatsu, Shigeo Kakinoki, Tomoaki Matsumoto, Kazushi Urasawa, Michinao Tan, Ichizo Tsujino, Mitsunori Kamigaki, Hirofumi Tomita, Kenji Hanada, Motoi Kushibiki, Akihiro Nakamura, Yoshihiro Morino, Takahito Nasu, Satoshi Yasuda, Hideaki Suzuki, Kaoru Iwabuchi, Kanako Tsuji, Shigeto Namiuchi, Tatsuya Komaru, Masahiro Yagi, Shoko Uematsu, Toshiaki Takahashi, Satoru Takeda, Toru Nakanishi, Masafumi Watanabe, Masahiro Wanezaki, Motoyuki Matsui, Shigeo Sugawara, Yasuchika Takeishi, Masayoshi Oikawa, Nobuo Komatsu, Satoshi Suzuki, Hiroshi Okamoto, Noriyuki Takeyasu, Daiki Akiyama, Yutaka Eki, Tsunekazu Kakuta, Tomoyo Sugiyama, Tomomi Koizumi, Koji Ueno, Kazuomi Kario, Mizuri Taki, Yuri Matsumoto, Takanori Yasu, Osamu Nishioka, Shigeto Naito, Makoto Murata, Shoichi Tange, Katsumi Kaneko, Makoto Muto, Hiroshi Inagaki, Shuichi Hasegawa, Eizo Tachibana, Wataru Atsumi, Masahiro Suzuki, Toshihiro Muramatsu, Yoshihiro Yamada, Isao Taguchi, Yoshiaki Fukuda, Akihiro Matsui, Junji Kanda, Koji Hozawa, Akihiko Matsumura, Wataru Shimizu, Takeshi Yamamoto, Issei Komuro, Masaru Hatano, Takanori Ikeda, Shunsuke Kiuchi, Taishiro Chikamori, Yasuyoshi Takei, Kyoko Soejima, Toshinori Minamishima, Hiroyuki Tanaka, Shigeo Shimizu, Masashi Kasao, Tadayuki Kadohira, Tohru Minamino, Kazunori Shimada, Hiroshi Iwata, Yukihiko Momiyama, Takashi Ashikaga, Toshihiro Nozato, Yasumasa Fujiwara, Kenji Inoue, Tetsuo Sasano, Junji Matsuda, Yasuhiro Ishii, Yuichi Ono, Kengo Tanabe, Yu Horiuchi, Toshiro Shinke, Yusuke Kodama, Masao Moroi, Yoshiyuki Yazaki, Taisuke Mizumura, Hiroshi Ohta, Yoshihiro Akashi, Nozomi Kotoku, Yuji Ikari, Mitsunori Maruyama, Yasuhiro Sato, Koichi Tamura, Masaaki Konishi, Hiroshi Suzuki, Mio Ebato, Kazuki Fukui, Kazuhiko Yumoto, Takamasa Iwasawa, Takeshi Kashimura, Kazuyoshi Takahashi, Yoshinobu Okada, Bunji Kaku, Kazuo Usuda, Michiro Maruyama, Tomoki Kameyama, Toshinori Higashikata, Akihiko Hodatsu, Kazuo Osato, Yoji Nagata, Koji Maeno, Kazuo Satake, Takao Sawanobori, Noboru Watanabe, Koichiro Kuwahara, Hirohiko Motoki, Hiroshi Kitabayashi, Kyuhachi Otagiri, Tsunesuke Kono, Daisuke Yamagishi, Yoshikazu Yazaki, Toshiyuki Noda, Itsuro Morishima, Naoki Watanabe, Shinichiro Tanaka, Tomoya Onodera, Ryuzo Nawada, Akinori Watanabe, Masaki Matsunaga, Satoru Suwa, Hiroshi Sakamoto, Hiroki Sakamoto, Takeshi Aoyama, Norio Kanamori, Masahiro Muto, Yuichiro Maekawa, Hayato Ohtani, Yukio Ozaki, Kenshin Naruse, Kenji Takemoto, Haruo Kamiya, Takeshi Suzuki, Yasushi Tomita, Susumu Suzuki, Ryosuke Kametani, Hidekazu Aoyama, Hiroyuki Osanai, Ken Harada, Kenji Kada, Tomoaki Saeki, Koichi Kobayashi, Yasuhiro Ogawa, Akihiro Terasawa, Masanori Shinoda, Mitsutoshi Oguri, Kiyokazu Shimizu, Akinori Sawamura, Atsushi Sugiura, Kosuke Hattori, Shinji Mokuno, Kazuhisa Kondo, Kaoru Dohi, Keishi Moriwaki, Atsunobu Kasai, Tetsuya Nakakuki, Kazuaki Kaitani, Toshikazu Jinnai, Takashi Yamamoto, Hiroyuki Kurata, Atsuyuki Wada, Masaharu Akao, Yasuhiro Hamatani, Kazuya Ishibashi, Yoshiki Akakabe, Yasuhide Asaumi, Hideo Matama, Yasushi Sakata, Hidetaka Kioka, Hiroshi Takaishi, Toru Takase, Mitsuo Matsuda, Fumi Sato, Shinji Hasegawa, Kenichi Ishigami, Minoru Ichikawa, Takashi Takagi, Moriaki Inoko, Masaaki Hoshiga, Shuichi Fujita, Yoshihiro Takeda, Takahiko Kawarabayashi, Hideyuki Takaoka, Kenji Nakajima, Tadashi Yuguchi, Tatsuya Kawasaki, Yukinori Shinoda, Yukihito Sato, Masaharu Ishihara, Yuki Matsumoto, Hiroya Kawai, Tomofumi Takaya, Kouki Matsuo, Toshiaki Mano, Kenichi Hirata, Eriko Hisamatsu, Nobutaka Inoue, Koichi Tamita, Naoki Mukohara, Hisashi Shimoyama, Toru Miyajima, Toshihiro Tamura, Yodo Tamaki, Megumi Suzuki, Ryoji Yokota, Manabu Horii, Kazuo Yamanaka, Hiroyuki Kawata, Yukihiro Hashimoto, Yasuki Nakada, Hitoshi Nakagawa, Tomoya Ueda, Taku Nishida, Ayako Seno, Makoto Watanabe, Takashi Akasaka, Takashi Tanimoto, Mamoru Toyofuku, Kazuhiro Yamamoto, Yoshiharu Kinugasa, Masayuki Hirai, Hiroshi Nasu, Kinya Shirota, Tsuyoshi Oda, Takefumi Oka, Kazushige Kadota, Masanobu Ohya, Hiroshi Ito, Kazufumi Nakamura, Soichiro Ogura, Soichiro Fuke, Shiro Uemura, Hiromi Matsubara, Atsuyuki Watanabe, Nobuyuki Morishima, Yasuki Kihara, Takayuki Hidaka, Hironori Ueda, Yujiro Ono, Yuji Muraoka, Miyo Hatanari, Yoshinori Miyamoto, Keigo Dote, Masaya Kato, Masafumi Yano, Mamoru Mochizuki, Yasuhiro Ikeda, Hiroyuki Fujinaga, Shinobu Hosokawa, Masataka Sata, Koji Yamaguchi, Naoko Aki, Tetsuo Minamino, Yuichi Miyake, Yuichiro Takagi, Masayuki Doi, Yoshio Taketani, Hideki Okayama, Tatsuya Shigematsu, Akinori Higaki, Osamu Yamaguchi, Shinji Inaba, Shuntaro Ikeda, Kazuya Kawai, Hiroaki Kitaoka, Toru Kubo, Kenji Ando, Kaoru Inui, Yoshihiro Fukumoto, Kensuke Hori, Takehiro Homma, Tomohiro Kawasaki, Masahiro Mohri, Masaki Fujiwara, Hiroyuki Tsutsui, Tomomi Ide, Shin-Ichiro Miura, Takashi Kuwano, Hideki Shimomura, Toshiaki Kadokami, Masanao Taba, Katsuhiro Kondou, Toru Kubota, Daisuke Nagatomo, Yasushi Mukai, Ryuichi Matsukawa, Hideki Tashiro, Mitsuhiro Shimomura, Koji Maemura, Hiroaki Kawano, Koji Oku, Toshihiko Yamasa, Yoshihisa Kizaki, Tomohiro Sakamoto, Yudai Tamura, Teruhiko Ito, Kazuteru Fujimoto, Kenichi Tsujita, Seiji Takashio, Hirofumi Kurokawa, Naohiko Takahashi, Shotaro Saito, Masaya Arikawa, Yoshisato Shibata, Kensaku Nishihira, Toshihiro Tsuruda, Masahiro Sonoda, Nobuhiko Atsuchi, Mitsuru Ohishi, Koji Higuchi, Masaaki Miyata, Naoya Oketani, Yoshinori Akimoto, Tomohiro Asahi, and Minoru Wake
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Male ,Myocarditis ,Physiology (medical) ,Humans ,Heart Transplantation ,Female ,Arrhythmias, Cardiac ,Middle Aged ,Prognosis ,Cardiology and Cardiovascular Medicine ,Retrospective Studies - Abstract
Background: Fulminant myocarditis presentation (FMP) is a rare and severe presentation of myocarditis. The natural history of FMP and its clinical features associated with poor outcomes are incompletely understood because there is a lack of generalizable evidence. Methods: This multicenter retrospective cohort study included patients hospitalized with histologically proven myocarditis who underwent catecholamine or mechanical support from 235 cardiovascular training hospitals across Japan between April 2012 and March 2017. Clinical features and the prognostic predictors of death or heart transplantation within 90 days on the basis of clinical and pathologic findings were determined using the Kaplan-Meier method, log-rank test, and Cox regression analysis. Results: This study included 344 patients with histologically proven FMP (median age, 54 years; 40% female). The median follow-up was 600 days (interquartile range, 36 to 1599 days) and the cumulative risk of death or heart transplantation at 90 days was 29% (n=98). Results from multivariable Cox regression analysis showed that older age, nonsinus rhythm, low left ventricular wall motion ( Conclusions: The results from analyses of data from this multicenter registry demonstrated that patients with FMP are at a higher risk of death or heart transplantation in real-world settings. These observations inform which clinical and pathologic findings may be useful for prognostication in FMP. Registration: URL: https://www.umin.ac.jp/ctr ; Unique identifier: UMIN000039763.
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- 2022
36. Endoplasmic reticulum stress promotes nuclear translocation of calmodulin, which activates phenotypic switching of vascular smooth muscle cells
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Tomoyuki Uchida, Tetsuro Oda, Takeshi Yamamoto, Masako Inamitsu, Chihiro Sakai, Hitoshi Uchinoumi, Takeshi Suetomi, Yoshihide Nakamura, Yoko Okamoto, Satomi Tateda, Shohei Fujii, Shinji Tanaka, Junya Nawata, Takayuki Okamura, Shigeki Kobayashi, and Masafumi Yano
- Subjects
Tunicamycin ,Biophysics ,Ryanodine Receptor Calcium Release Channel ,Suramin ,Cell Biology ,Atherosclerosis ,Endoplasmic Reticulum Stress ,Biochemistry ,Dantrolene ,Muscle, Smooth, Vascular ,Mice ,Calmodulin ,Animals ,Molecular Biology - Abstract
Increased endoplasmic reticulum (ER) stress is strongly associated with the phenotypic switching of vascular smooth muscle cells (VSMCs) in atherosclerosis. Depletion of the ER CaTunicamycin was used to mimic ER stress in vitro. Tunicamycin-induced ER stress caused CaM to dissociate from the RyR and translocate to the nucleus, which stimulated phenotypic switching through the activation of MEF2 and KLF5. Dantrolene suppressed tunicamycin-induced apoptosis, ER stress (restoring ER CaWe observed that ER stress causes CaM translocation to the nucleus and drives the phenotypic switching of VSMCs. Thus, restoration of the binding affinity of CaM to RyR may be a therapeutic target for atherosclerosis.
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- 2022
37. Dantrolene, a stabilizer of the ryanodine receptor, prevents collagen-induced arthritis
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Takashi Nawata, Hiroki Sakai, Takeshi Honda, Marina Otsuka, Hina Fujita, Hitoshi Uchinoumi, Shigeki Kobayashi, Takeshi Yamamoto, Masataka Asagiri, and Masafumi Yano
- Subjects
Male ,Biophysics ,Ryanodine Receptor Calcium Release Channel ,Cell Biology ,Arthritis, Experimental ,Biochemistry ,Dantrolene ,Mice ,Mice, Inbred DBA ,Immunoglobulin G ,Animals ,Female ,Collagen Type II ,Molecular Biology - Abstract
Dantrolene inhibits Ca
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- 2022
38. Dantrolene reduces platelet-derived growth factor (PDGF)-induced vascular smooth muscle cell proliferation and neointimal formation following vascular injury in mice
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Chihiro Sakai, Mei Mikawa, Takeshi Yamamoto, Tomoyuki Uchida, Yoshihide Nakamura, Hideaki Akase, Takeshi Suetomi, Naoomi Tominaga, Masako Inamitsu, Tetsuro Oda, Takayuki Okamura, Shigeki Kobayashi, and Masafumi Yano
- Subjects
Platelet-Derived Growth Factor ,Myocytes, Smooth Muscle ,Biophysics ,Cell Biology ,Vascular System Injuries ,Biochemistry ,Dantrolene ,Muscle, Smooth, Vascular ,Mice, Inbred C57BL ,Disease Models, Animal ,Mice ,Cell Movement ,Neointima ,Animals ,Molecular Biology ,Cells, Cultured ,Cell Proliferation - Abstract
Dantrolene is a ryanodine receptor blocker that is used clinically for treatment of malignant hyperthermia. This study was conducted using murine aortic vascular smooth muscle cells (MOVAS) and a mouse arterial injury model to investigate the inhibitory effect of dantrolene on smooth muscle cell proliferation and migration. We investigated whether dantrolene suppressed platelet-derived growth factor (PDGF)-induced vascular smooth muscle cell proliferation and migration in vitro. The effect of dantrolene on smooth muscle phenotype was evaluated using immunostaining. In addition, smooth muscle cell proliferation and phenotype switching were tested by applying dantrolene around blood vessels using a mouse arterial injury model. Dantrolene inhibited PDGF-induced cell proliferation and migration of MOVAS. Dantrolene also inhibited the switch from contractile to synthetic phenotype both in vitro and in vivo. Dantrolene is effective at inhibiting vascular smooth muscle cell proliferation, migration, and neointimal formation following arterial injury in mice.
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- 2022
39. Acute heart failure following the initiation of cabozantinib, a multikinase inhibitor: A case report
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Hironori Ishiguchi, Masamune Uchida, Takayuki Okamura, Shigeki Kobayashi, and Masafumi Yano
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Case Report ,Cardiology and Cardiovascular Medicine - Abstract
Cabozantinib is a multikinase inhibitor that exerts anticancer activity against malignancies such as renal tumors and leukemia. Although other agents that belong to the same category can cause cardiotoxicity, there is a paucity of information on the safety profile of cabozantinib. Herein, we present the case of a 62-year-old woman who developed acute heart failure (HF) following the initiation of cabozantinib for a metastatic renal tumor. She had no history of cardiovascular disease. Echocardiography prior to chemotherapy revealed normal cardiac function. However, she developed sudden onset of dyspnea 23 days following cabozantinib initiation. The chest X-ray showed newly developed congestion and cardiomegaly, and echocardiography revealed severe impairment of systolic and diastolic function. She was referred to the intensive care unit for non-invasive positive pressure ventilation and infusion of inotropes. The cardiac function fairly recovered on day 46; thereafter, supportive therapy, followed by guideline-directed medical therapy for HF with reduced ejection fraction was provided. We describe the first case of severe acute HF following cabozantinib initiation without underlying heart disease. Clinicians should plan follow-up schedules and be cautious of the development of HF when they initiate the agent, even if patients appear to have a low cardiovascular disease risk. LEARNING OBJECTIVES: • We report the first case of acute heart failure following cabozantinib initiation without an underlying heart disease. • Prompt discontinuation of the agent and supportive therapy with guideline-directed medications can allow adequate recovery of cardiac function, even if the severity of heart failure is high. • Careful follow-up following the initiation is warranted when clinicians plan to initiate cabozantinib, even if patients appear to have low risk of cardiovascular disease.
- Published
- 2022
40. An invited review following the Soujinkai Young Investigator Award: Stabilization of RyR2 Maintains Right Ventricular Function, Reduces the Development of Ventricular Arrhythmias, and Improves Prognosis in Pulmonary Hypertension.
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Shinji Tanaka, Takeshi Yamamoto, Shigeki Kobayashi, and Masafumi Yano
- Published
- 2023
41. Thrombus formation on the stump of a resected left atrial appendage in a case with a history of left atrial appendage thrombus owing to left atrial ischaemia: a follow-up case report
- Author
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Hironori Ishiguchi, Takayuki Okamura, and Masafumi Yano
- Subjects
Cardiology and Cardiovascular Medicine - Published
- 2023
42. Abnormal mosaic flow in the left atrium observed from a parasternal long-axis view in a patient with a history of pulmonary vein isolation: a case report
- Author
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Hironori Ishiguchi, Yasuhiro Yoshiga, Takayuki Okamura, and Masafumi Yano
- Subjects
Cardiology and Cardiovascular Medicine - Published
- 2023
43. Enhanced oxidative stress and presence of ventricular aneurysm for risk prediction in cardiac sarcoidosis
- Author
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Ryosuke Yoshitomi, Shigeki Kobayashi, Yasutake Yano, Yusuke Nakashima, Shohei Fujii, Takuma Nanno, Hironori Ishiguchi, Masakazu Fukuda, Yasuhiro Yoshiga, Takayuki Okamura, Kazuyoshi Suga, Reo Kawano, and Masafumi Yano
- Subjects
Sarcoidosis ,Myocarditis ,Oxidative Stress ,Death, Sudden, Cardiac ,8-Hydroxy-2'-Deoxyguanosine ,Fluorodeoxyglucose F18 ,Risk Factors ,Tachycardia, Ventricular ,Humans ,Prospective Studies ,Heart Aneurysm ,Cardiomyopathies ,Cardiology and Cardiovascular Medicine ,Biomarkers - Abstract
ObjectiveSudden cardiac death (SCD) is the major cause of death in cardiac sarcoidosis (CS). We aimed to identify the prognostic markers for sustained ventricular tachycardia (sVT) and SCD in patients with CS.MethodsWe performed a prospective observational cohort study for patients with CS diagnosed according to the Japanese or Heart Rhythm Society guidelines between June 2008 and March 2020 in our hospital. The primary endpoint was a composite of the first sVT and SCD. The levels of urinary 8-hydroxy-2′-deoxyguanosine (U-8-OHdG), a marker of oxidative DNA damage that reflects the inflammatory activity of CS, other biomarkers, and indices of cardiac function and renal function were measured on admission.ResultsEighty-nine consecutive patients with CS were enrolled; 28 patients with no abnormal18F-fluorodeoxyglucose (18F-FDG) accumulation in the heart were excluded and 61 patients with abnormal18F-FDG accumulation were followed up for a median of 46 months (IQR: 20–84). During the follow-up period, 15 of 61 patients showed sVT (n=12) or SCD (n=3). A Cox proportional hazard model showed that U-8-OHdG concentration and presence of ventricular aneurysm (VA) were independent predictors of first sVT/SCD. The cut-off U-8-OHdG concentration for predicting first sVT/SCD was 14.9 ng/mg·Cr. Patients with U-8-OHdG concentration ≥14.9 ng/mg·Cr and VA showed a significantly increased risk of sVT/SCD.ConclusionsU-8-OHdG and presence of VA were powerful predictors of first sVT/SCD in patients with CS, facilitating the stratification of cardiac events and providing relevant information about the substrates of ventricular tachycardia.
- Published
- 2022
44. Stabilizing Tetrameric Structure of Ryanodine Receptor Cures Lethal Arrhythmia in Heart Failure
- Author
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Shigeki Kobayashi, Takeshi Yamamoto, Yasuhiro Yoshiga, Takayuki Okamura, Reo Kawano, and Masafumi Yano
- Subjects
Heart Failure ,Ryanodine ,Physiology (medical) ,Humans ,Ryanodine Receptor Calcium Release Channel ,Arrhythmias, Cardiac ,Calcium ,Calcium Signaling ,Cardiology and Cardiovascular Medicine - Published
- 2022
45. Chronic Expanding Hematoma in Device Pocket Developing 5 Years After Implantation
- Author
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Tomoyuki Uchida, Hironori Ishiguchi, Toru Ariyoshi, Miho Fujita, Masakazu Fukuda, Yasuaki Wada, Yasuhiro Yoshiga, Takayuki Okamura, and Masafumi Yano
- Subjects
General Medicine - Published
- 2023
46. Non-Fasting Hypertriglyceridemia as an Independent Risk Factor for Coronary In-Stent Restenosis after Primary Bare Metal Stent Implantation in Patients with Coronary Artery Disease
- Author
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Reo Kawano, Toshiro Miura, Tatsuhiro Fujimura, Masakazu Tanaka, Michio Yamada, Tomoko Nao, Masayuki Yoshimura, Masafumi Yano, Seiji Umemoto, and Mitsuyuki Hiromoto
- Subjects
Bare-metal stent ,medicine.medical_specialty ,business.industry ,medicine.medical_treatment ,Hypertriglyceridemia ,Percutaneous coronary intervention ,General Medicine ,Odds ratio ,medicine.disease ,Coronary artery disease ,Restenosis ,Internal medicine ,Conventional PCI ,medicine ,Cardiology ,cardiovascular diseases ,Risk factor ,Cardiology and Cardiovascular Medicine ,business - Abstract
After a percutaneous coronary intervention (PCI) in patients with coronary artery disease (CAD), in-stent neoatherosclerosis may pose a risk of in-stent restenosis (ISR). To clarify whether non-fasting hypertriglyceridemia contributes to ISR, we examined the relationship between non-fasting hypertriglyceridemia (i.e., triglyceride (TG) level ≥ 200 mg/dL) and ISR after stenting with a bare metal stent (BMS) post-primary PCI in patients with CAD by means of a single-site retrospective analysis. A total of 1,039 patients with CAD were enrolled, and 86 patients (112 lesions) were evaluated for BMS-ISR 3-6 months post-primary PCI. The percentage of patients with non-fasting hypertriglyceridemia was significantly higher in the ISR (+) group than in the ISR (-) group (P < 0.009). The follow-up period and number of patients in the ISR (+) group were significantly smaller than those in the ISR (-) group (P < 0.001). There were no significant between-group differences in the other baseline patient characteristics before the primary PCI or at the time of the follow-up coronary angiography. However, at the follow-up period, the ISR (+) group had significantly lower diastolic blood pressure and high-density lipoprotein cholesterol levels (P = 0.015) and significantly higher TG levels (P = 0.012) than the ISR (-) group. A multiple logistic regression analysis demonstrated that non-fasting hypertriglyceridemia and a follow-up period of ≥ 6 months were independent risk factors for ISR after primary PCI in patients with BMS implantation for stenotic CAD (P = 0.006), with an adjusted odds ratio of 8.232 (1.201-56.410) and 0.006 (95% confidence interval < 0.001-0.045), respectively. Non-fasting hypertriglyceridemia may be an additional independent risk factor for BMS-ISR after primary PCI in patients with CAD.
- Published
- 2021
47. Echocardiographic features of acute-phase microscopic polyangiitis in Japanese patients: A single-centre retrospective study
- Author
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Takashi Nawata, Natsu Kinoshita, Shinichi Okuda, Makoto Kubo, Yasuaki Wada, Shigeki Kobayashi, Nobuaki Tanaka, and Masafumi Yano
- Subjects
Ventricular Dysfunction, Left ,Japan ,Rheumatology ,Diastole ,Echocardiography ,Humans ,Microscopic Polyangiitis ,Ventricular Function, Left ,Retrospective Studies - Abstract
Objectives Microscopic polyangiitis (MPA) affects various organs. However, echocardiographic findings of MPA are unclear. We aimed to evaluate the echocardiographic features of acute-phase MPA in Japanese patients. Methods This single-centre retrospective study included 15 patients with MPA who underwent echocardiography within 2 weeks of commencing steroid therapy for induction or reinduction. The echocardiography parameters of thetients were compared with those of 30 age- and sex-matched controls. Results No significant differences in left ventricular (LV) diameter, LV ejection fraction, or e’ were observed between the two groups. However, the MPA group showed a significantly higher left atrial (LA) diameter and LA volume index, as well as higher early diastolic filling velocity, diastolic pulmonary venous flow velocity, and trans-tricuspid pressure gradient, and a shorter deceleration time (DCT). Serum C-reactive protein levels were positively correlated with E wave, E/A, and DCT. These results may indicate that increased LV stiffness, rather than impairment of LV relaxation, contributed to LV diastolic function, resulting in LA enlargement. Conclusions Patients with acute-phase MPA had LA dilatation associated with LV diastolic dysfunction. This finding indicates the importance of cardiac assessment in patients with MPA, especially in patients with a strong inflammatory reaction.
- Published
- 2021
48. Serial changes in the quantitative flow ratio in patients with intermediate residual stenosis after percutaneous coronary intervention
- Author
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Yosuke Miyazaki, Masafumi Yano, Tatsuhiro Fujimura, Hideaki Akase, Takeshi Nakamura, Hiroki Tateishi, Akinori Ono, Takayuki Okamura, Mamoru Mochizuki, Tetsuro Oda, Hitoshi Uchinoumi, Hitoshi Takenaka, and Takeshi Suetomi
- Subjects
medicine.medical_specialty ,medicine.medical_treatment ,Constriction, Pathologic ,Coronary Artery Disease ,Coronary Angiography ,Revascularization ,Percutaneous Coronary Intervention ,Predictive Value of Tests ,Internal medicine ,medicine ,Humans ,medicine.diagnostic_test ,business.industry ,Surrogate endpoint ,Coronary Stenosis ,Percutaneous coronary intervention ,Vascular surgery ,medicine.disease ,Coronary Vessels ,Confidence interval ,Cardiac surgery ,Fractional Flow Reserve, Myocardial ,Stenosis ,Angiography ,Cardiology ,Cardiology and Cardiovascular Medicine ,business - Abstract
A beneficial surrogate marker for evaluating the effect of medical therapy is warranted to avoid deferred lesion revascularization. Similar to coronary artery imaging for monitoring the effects of medical therapy by analyzing plaque regression and stabilization, we hypothesized that evaluation of serial changes in the quantitative flow ratio (QFR) would serve as a surrogate marker of the effects of medical therapy against deferred lesion revascularization. Here, we investigated serial changes in QFR over time after percutaneous coronary intervention in patients who underwent medical therapy as a secondary prevention. Patients with intermediate stenosis in an untreated vessel observed at the baseline (BL) coronary angiography and follow-up (FU) coronary angiography performed 6–18 months after BL angiography were screened in 2 centers. A total of 52 patients were able to analyze both BL and FU QFR. The median QFR was 0.83 (IQR, 0.69, 0.89) at BL and 0.80 (IQR, 0.70, 0.86) at FU. The number of positive ΔQFR and negative ΔQFR were 21 and 31, respectively. The median ΔQFR was 0.05 (IQR, 0.03, 0.09) in positive ΔQFR and – 0.05 (IQR, – 0.07, – 0.03) in negative ΔQFR (p
- Published
- 2021
49. Left atrial appendage thrombus secondary to left atrial ischaemia owing to impaired left atrial branch perfusion
- Author
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Hironori Ishiguchi, Takayuki Okamura, and Masafumi Yano
- Subjects
Cardiology and Cardiovascular Medicine - Published
- 2022
50. Substituent Control of Near-Infrared Absorption of Triphenylamine Radical Cation
- Author
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Masafumi Yano, Mai Sasaoka, Kohei Tamada, Misaki Nakai, Tatsuo Yajima, Koichi Mitsudo, and Yukiyasu Kashiwagi
- Subjects
triarylamine ,radical cation ,near infrared absorption ,substituent control - Abstract
Five triphenyltriphenylamines with various substituents were investigated as precursors for near-infrared absorbing materials. Cyclic voltammetry (CV) studies showed that they all give stable radical cations in solution. The radical cations obtained by one-electron chemical oxidation of these compounds show strong absorption in the near-infrared region, and the position of the absorption is strongly influenced by the substituent. DFT (density functional theory) calculations suggest that the introduction of stronger electron-donating substituents would result in a smaller HOMO–SOMO energy gap and thus a larger long wavelength shift, which is consistent with the experimental results. On the other hand, strong electron-withdrawing substituents increase the HOMO–SOMO energy gap, resulting in a short wavelength shift. The position of the near-infrared absorption peak of the triphenylamine radical cation can be controlled to the longer or shorter wavelength direction depending on the substituent. A molecular design of near-infrared absorbing dyes utilizing the electronic effects of substituents is described.
- Published
- 2022
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