Search

Contains fulltext : 282291.pdf (Publisher’s version ) (Open Access)

Item does not contain fulltext, OBJECTIVE: Obesity is associated with impaired gut microbiota diversity, which has been linked to the development of type 2 diabetes. This study aims to examine the effects of an 8-week aerobic exercise intervention on insulin sensitivity, visceral adiposity, and gut microbiota diversity and composition in participants with obesity. METHODS: Fourteen participants (mean [SD], age 51 [11] years; BMI 34.9 [4.9] kg/m(2) ) performed an 8-week exercise intervention (2 to 4 times/week on 65% to 85% of heart rate reserve). Insulin sensitivity (hyperinsulemic euglycemic clamp), cardiorespiratory fitness (maximal oxygen uptake), visceral adiposity (dual-energy X-ray absorptiometry scan) and gut microbiota composition (16S rRNA gene sequencing) were measured before and after the intervention. RESULTS: Insulin sensitivity showed a significant increase (pre: 3.8 [1.9] mg/min/kg; post: 4.5 [1.7] mg/min/kg; p = 0.007) after training, whereas visceral adiposity decreased (pre: 959 [361] cm(3) ; post: 897 [364] cm(3) ; p = 0.02). No change in gut microbiota α- or β-diversity was found. At the genus level, the abundance of Ruminococcus gauvreauii (p = 0.02); Lachnospiraceae FCS020 group (p = 0.04), and Anaerostipes (p = 0.04) significantly increased after exercise training. Significant positive correlations were present for M-value (R. gauvreauii) and VO(2) max (R. gauvreauii and Anaerostipes). CONCLUSIONS: Eight-week exercise training in humans with obesity leads to marked improvements in insulin sensitivity and body composition and is accompanied by modest changes in 3 gut microbiome genera, all belonging to the Firmicutes phylum.

Item does not contain fulltext

Item does not contain fulltext, OBJECTIVE: Cushing's syndrome (CS) is associated with osteoporosis and high fracture risk. Besides male sex, it is unknown which variables influence bone mineral density (BMD) at diagnosis and it is unclear to what extent BMD normalizes during long-term follow-up after treatment of CS. The aim of this study was to determine factors associated with BMD at diagnosis of CS and to determine the long-term course of BMD and fracture rate after successful treatment of CS. DESIGN: Retrospective cross-sectional and longitudinal cohort study. METHODS: Data were collected from 231 patients with CS who were treated at the Radboud University Medical Centre between 1968 and 2020. RESULTS: At diagnosis, male sex was associated with lower Z-scores at the lumbar spine (LS) compared with female sex: -0.97s.d. (-1.45 to -0.49) after correction for possible confounders. Shorter duration of symptoms and younger age were also associated with lower Z-scores at diagnosis, while etiology of CS, urinary cortisol excretion and gonadal status were not associated with Z-scores at diagnosis. Z-scores improved up to 20 years after treatment. Fifteen years after treatment, men showed larger improvements of Z-scores than women; +2.56 (1.82-3.30) increase in LS Z-score vs +1.48 (0.96-2.00) respectively. Fracture incidence was highest during the 2 years before diagnosis and decreased after treatment. CONCLUSION: Male sex, younger age and shorter duration of symptoms are associated with lower BMD at diagnosis of CS. BMD continues to improve up to 20 years after treatment of CS. Fracture rate decreases after treatment of CS.

Radboud University, 27 januari 2021, Promotores : Timmers, H.J.L.M., Hermus, A.R.M.M., Gotthardt, M., Contains fulltext : 228892.pdf (publisher's version ) (Open Access)

Contains fulltext : 231074.pdf (Publisher’s version ) (Open Access)

Introduction: Multiple endocrine neoplasia type 1 (MEN1) is a hereditary endocrine tumor syndrome characterized by the triad of primary hyperparathyroidism, duodenopancreatic neuroendocrine tumors (pNETs), and pituitary tumors. Patients are confronted with substantial morbidity and are consequently at risk for an impaired quality of life (QOL). Meticulous assessment of QOL and associated factors in a representative population is needed to understand the full spectrum of the burden of the disease. Patients and Methods: A cross-sectional study was performed using the national Dutch MEN1 cohort. Patients with a confirmed MEN1 mutation received the SF-36 Health Related Quality of Life questionnaire and questions regarding sociodemographic and medical history. Results: A total of 227 of 285 (80%) eligible MEN1 patients returned the questionnaires. Health-related QOL scores (HRQOL) in MEN1 patients were significantly lower for the majority of subscales of the SF-36 in comparison with the general Dutch population. The most consistent predictor for HRQOL was employment status, followed by the presence of a pituitary tumor. 16% of patients harboring a pNET and 29% of patients with a pituitary tumor according to the medical records, reported that they were unaware of such a tumor. These subgroups of patients had several significant better QOL scores than patients who were aware of their pNET or pituitary tumors. Conclusion: Patients with MEN1 have an impaired QOL in comparison with the general Dutch population warranting special attention within routine care. For daily practice, physicians should be aware of their patients' impaired QOL and of the impact of unemployment on QOL.

Radboud University, 9 september 2020, Promotores : Evers, A.W.M., Hermus, A.R.M.M., Contains fulltext : 220329.pdf (Publisher’s version ) (Open Access)

Contains fulltext : 229551.pdf (Publisher’s version ) (Open Access), Acromegaly is characterized by Growth Hormone (GH) and Insulin-like Growth Factor 1 (IGF-1) excess. Uncontrolled acromegaly is associated with a strongly increased risk of cardiovascular disease (CVD), and numerous cardiovascular risk factors remain present after remission. GH and IGF-1 have numerous effects on the immune and cardiovascular system. Since endothelial damage and systemic inflammation are strongly linked to the development of CVD, and have been suggested to be present in both controlled as uncontrolled acromegaly, they may explain the presence of both micro- and macrovascular dysfunction in these patients. In addition, these changes seem to be only partially reversible after remission, as illustrated by the often reported presence of endothelial dysfunction and microvascular damage in controlled acromegaly. Previous studies suggest that insulin resistance, oxidative stress, and endothelial dysfunction are involved in the development of CVD in acromegaly. Not surprisingly, these processes are associated with systemic inflammation and respond to GH/IGF-1 normalizing treatment.

Contains fulltext : 224866.pdf (publisher's version ) (Open Access), BACKGROUND: Adrenocortical carcinoma is a rare malignancy with a poor prognosis. We hypothesized that patients with adrenocortical carcinoma are at high risk for venous thromboembolism, given the numerous risk factors such as malignancy, abdominal surgery, immobility and hormonal excess. The aim of this study was to determine retrospectively the incidence of venous thromboembolisms after surgical treatment in patients with adrenocortical carcinoma. MATERIALS AND METHODS: A retrospective study was performed, collecting data from all patients diagnosed with adrenocortical carcinoma from 2003 to 2018 at the Radboud University Medical Centre, The Netherlands. RESULTS: In 34 patients, eight postoperative venous thromboembolisms, all pulmonary embolisms, were diagnosed in the first 6 months after adrenalectomy (23.5%). In addition, one patient developed pulmonary embolism just prior to surgery and one patient 7 years after surgery. Five of the eight patients with postoperative venous thromboembolisms presented with symptomatic pulmonary embolism whereas the other three pulmonary embolisms were incidentally found on regular follow up CT scans. Seven of the eight venous thromboembolisms occurred within 10 weeks after surgery. Seven of the eight patients had advanced stage adrenocortical carcinoma and four patients already received low-molecular weight heparin during the development of the venous thromboembolism. There was one case of fatal pulmonary embolism in a patient with a cortisol producing tumor with pulmonary metastases, despite the use of a therapeutic dose thromboprophylaxis. CONCLUSION: Patients with adrenocortical carcinoma are at high risk of developing postoperative venous thromboembolisms. Prolonged postoperative thromboprophylaxis could be considered in these patients.

Radboud University, 6 november 2020, Promotores : Hermus, A.R.M.M., Smit, J.W.A. Co-promotor : Netea-Maier, R.T., Contains fulltext : 222216.pdf (publisher's version ) (Open Access)

Contains fulltext : 217420.pdf (Publisher’s version ) (Open Access)

Contains fulltext : 217592.pdf (Publisher’s version ) (Closed access)

Contains fulltext : 218726.pdf (Publisher’s version ) (Open Access), BACKGROUND: Although major improvements are achieved after cure of Cushing syndrome (CS), fatigue and decreased quality of life persist. This is the first study to measure aerobic exercise capacity in patients in remission of CS for more than 4 years in comparison with matched controls, and to investigate whether the reduction in exercise capacity is related to alterations in muscle tissue. METHODS: Seventeen patients were included. A control individual, matched for sex, estrogen status, age, body mass index, smoking, ethnicity, and physical activity level was recruited for each patient. Maximal aerobic capacity (VO2peak) was assessed during incremental bicycle exercise to exhaustion. In 8 individually matched patients and controls, a percutaneous muscle biopsy was obtained and measures were made of cross-sectional areas, capillarization, and oxphos complex IV (COXIV) protein content as an indicator of mitochondrial content. Furthermore, protein content of endothelial nitric oxide synthase (eNOS) and eNOS phosphorylated on serine1177 and of the NAD(P)H-oxidase subunits NOX2, p47phox, and p67phox were measured in the microvascular endothelial layer. FINDINGS: Patients showed a lower mean VO2peak (SD) (28.0 [7.0] vs 34.8 [7.9] ml O2/kg bw/min, P < .01), maximal workload (SD) (176 [49] vs 212 [67] watt, P = .01), and oxygen pulse (SD) (12.0 [3.7] vs 14.8 [4.2] ml/beat, P < .01) at VO2peak. No differences were seen in muscle fiber type-specific cross-sectional area, capillarization measures, mitochondrial content, and protein content of eNOS, eNOS-P-ser1177, NOX2, p47phox, and p67phox. INTERPRETATION: Because differences in muscle fiber and microvascular outcome measures are not statistically significant, we hypothesize that cardiac dysfunction, seen in active CS, persists during remission and limits blood supply to muscles.

Contains fulltext : 218977.pdf (Publisher’s version ) (Open Access)

Radboud University, 11 september 2020, Promotores : Hermus, A.R.M.M., Lenders, J.W.M. Co-promotores : Deinum, J., Timmers, H.J.L.M., Contains fulltext : 220338.pdf (publisher's version ) (Open Access)

BACKGROUND: Although major improvements are achieved after cure of Cushing syndrome (CS), fatigue and decreased quality of life persist. This is the first study to measure aerobic exercise capacity in patients in remission of CS for more than 4 years in comparison with matched controls, and to investigate whether the reduction in exercise capacity is related to alterations in muscle tissue. METHODS: Seventeen patients were included. A control individual, matched for sex, estrogen status, age, body mass index, smoking, ethnicity, and physical activity level was recruited for each patient. Maximal aerobic capacity (VO2peak) was assessed during incremental bicycle exercise to exhaustion. In 8 individually matched patients and controls, a percutaneous muscle biopsy was obtained and measures were made of cross-sectional areas, capillarization, and oxphos complex IV (COXIV) protein content as an indicator of mitochondrial content. Furthermore, protein content of endothelial nitric oxide synthase (eNOS) and eNOS phosphorylated on serine1177 and of the NAD(P)H-oxidase subunits NOX2, p47phox, and p67phox were measured in the microvascular endothelial layer. FINDINGS: Patients showed a lower mean VO2peak (SD) (28.0 [7.0] vs 34.8 [7.9] ml O2/kg bw/min, P < .01), maximal workload (SD) (176 [49] vs 212 [67] watt, P = .01), and oxygen pulse (SD) (12.0 [3.7] vs 14.8 [4.2] ml/beat, P < .01) at VO2peak. No differences were seen in muscle fiber type-specific cross-sectional area, capillarization measures, mitochondrial content, and protein content of eNOS, eNOS-P-ser1177, NOX2, p47phox, and p67phox. INTERPRETATION: Because differences in muscle fiber and microvascular outcome measures are not statistically significant, we hypothesize that cardiac dysfunction, seen in active CS, persists during remission and limits blood supply to muscles.

Radboud University, 08 september 2020, Promotores : Hermus, A.R.M.M., Tack, C.J.J. Co-promotor : Boer, H. de, Contains fulltext : 220349.pdf (publisher's version ) (Open Access)

Item does not contain fulltext

Contains fulltext : 202908.pdf (publisher's version ) (Closed access), Context Multiple endocrine neoplasia type 1 (MEN1) is an autosomal dominant disease caused by mutations in the tumor suppressor gene MEN1 and can be diagnosed based on clinical, familial and/or genetic criteria. We present a family in which we found both germline and somatic mosaicism for MEN1. Family description In our proband, we diagnosed MEN1. The mutation was not detected in her parents (DNA extracted from leucocytes). When her brother was found to harbor the same MEN1 mutation as our proband and, around the same time, their father was diagnosed with a neuroendocrine carcinoma, this tumor was investigated for the MEN1 mutation as well. In the histologic biopsy of this tumor, the same MEN1 mutation was detected as previously found in his children. Re-analysis of his blood using multiplex ligation-dependent probe amplification (MLPA) showed a minimal, but consistently decreased signal for the MEN1-specific MLPA probes. The deletion was confirmed in his son by high-resolution array analysis. Based on the array data, we concluded that the deletion was limited to the MEN1 gene and that the father had both germline and somatic mosaicism for MEN1. Conclusions To our knowledge, this is the first reported family with combined germline and somatic mosaicism for MEN1. This study illustrates that germline mosaicism is important to consider in apparently sporadic de novo MEN1 mutations, because of its particular importance for genetic counseling, specifically when evaluating the risk for family members and when considering the possibility of somatic mosaicism in the parent with germline mosaicism.

Contains fulltext : 204599.pdf (publisher's version ) (Closed access)

Contains fulltext : 202780.pdf (publisher's version ) (Open Access)

Contains fulltext : 198472.pdf (publisher's version ) (Closed access)

Contains fulltext : 209658.pdf (publisher's version ) (Open Access)

01 februari 2019, Item does not contain fulltext, OBJECTIVES: Obesity is characterized by a pro-inflammatory state, which plays a role in the pathogenesis of metabolic and cardiovascular disease. An exercise bout causes a transient increase in pro-inflammatory cytokines, whilst training has anti-inflammatory effects. No previous study examined whether the exercise-induced increase in pro-inflammatory cytokines is altered with repeated prolonged exercise bouts and whether this response differs between lean and overweight/obese individuals. DESIGN: Lean (n=25, BMI 22.9+/-1.5kg/m(2)) and age-/sex-matched overweight/obese (n=25; BMI 27.9+/-2.4kg/m(2)) individuals performed walking exercise for 30, 40 or 50km per day on four consecutive days (distances similar between groups). METHODS: Circulating cytokines (IL-6, IL-10, TNF-alpha, IL-1beta and IL-8) were examined at baseline and <30min after the finish of each exercise day. RESULTS: At baseline, no differences in circulating cytokines were present between groups. In response to prolonged exercise, all cytokines increased on day 1 (IL-1beta: P=0.02; other cytokines: P<0.001). IL-6 remained significantly elevated during the 4 exercise days, when compared to baseline. IL-10, TNF-alpha, IL-1beta and IL-8 returned to baseline values from exercise day 2 (IL-10, IL-1beta, IL-8) or exercise day 3 (TNF-alpha) onward. No significant differences were found between groups for all cytokines, except IL-8 (Time*Group Interaction P=0.02). CONCLUSIONS: These data suggest the presence of early adaptive mechanisms in response to repeated prolonged walking, demonstrated by attenuated exercise-induced elevations in cytokines on consecutive days that occur similar in lean and overweight/obese individuals.

Contains fulltext : 202887.pdf (publisher's version ) (Open Access)

Rede uitgesproken bij het afscheid van het ambt van hoogleraar Interne Geneeskunde aan de Radboud Universiteit/Radboudumc op 6 december 2019, Contains fulltext : 216396.pdf (publisher's version ) (Open Access)

Radboud University, 28 oktober 2019, Promotores : Hermus, A.R.M.M., Smit, J.W.A. Co-promotores : Netea-Maier, R.T., Plantinga, T.S., Contains fulltext : 207771.pdf (publisher's version ) (Open Access)

Item does not contain fulltext

Item does not contain fulltext

Item does not contain fulltext

Item does not contain fulltext

Radboud University, 12 oktober 2018, Promotores : Noordam, C., Hermus, A.R.M.M. Co-promotores : Kapusta, L., Claahsen-van der Grinten, H.L., Contains fulltext : 195511.pdf (publisher's version ) (Open Access)