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Background: COVID-19 pathophysiology and the predictive factors involved are not fully understood, but lymphocytes dysregulation appears to play a role. This paper aims to evaluate lymphocyte subsets in the pathophysiology of COVID-19 and as predictive factors for severe disease., Patient and Methods: A prospective cohort study of patients with SARS-CoV-2 bilateral pneumonia recruited at hospital admission. Demographics, medical history, and data regarding SARS-CoV-2 infection were recorded. Patients systematically underwent complete laboratory tests, including parameters related to COVID-19 as well as lymphocyte subsets study at the time of admission. Severe disease criteria were established at admission, and patients were classified on remote follow-up according to disease evolution. Linear regression models were used to assess associations with disease evolution, and Receiver Operating Characteristic (ROC) and the corresponding Area Under the Curve (AUC) were used to evaluate predictive values., Results: Patients with critical COVID-19 showed a decrease in CD3+CD4+ T cells count compared to non-critical (278 (485 IQR) vs. 545 (322 IQR)), a decrease in median CD4+/CD8+ ratio (1.7, (1.7 IQR) vs. 3.1 (2.4 IQR)), and a decrease in median CD4+MFI (21,820 (4491 IQR) vs. 26,259 (3256 IQR)), which persisted after adjustment. CD3+CD8+ T cells count had a high correlation with time to hospital discharge (PC = -0.700 (-0.931, -0.066)). ROC curves for predictive value showed lymphocyte subsets achieving the best performances, specifically CD3+CD4+ T cells (AUC = 0.756), CD4+/CD8+ ratio (AUC = 0.767), and CD4+MFI (AUC = 0.848)., Conclusions: A predictive value and treatment considerations for lymphocyte subsets are suggested, especially for CD3CD4+ T cells. Lymphocyte subsets determination at hospital admission is recommended.

Introduction: End-stage renal disease (ESRD) related to HIV is becoming a leading cause of renal replacement therapy requirement is some areas of the world. Our study aims to describe the incidence and renal outcomes of HIV-associated nephropathy (HIVAN), and immune-mediated kidney disease related to HIV (HIVICK) in Colombia., Methodology: A retrospective cohort study was performed, including all HIVAN or HIVICK incident cases assessed by the infectious diseases division in a high complexity institution in Colombia, between 2004 and 2018. A longitudinal data model under the Generalized Estimating Equations (GEE) method was used to determine changes on the glomerular filtration rate (GFR) over time., Results: Within a cohort composed by 1509 HIV-infected patients, we identified 22 with HIV-associated glomerular disease. Cumulative incidence was 1.45%. At diagnosis, GFR was above 30 mL/min in 90.8% of patients, and 77.2% displayed sub-nephrotic proteinuria. Factors associated with GFR at diagnosis were: level of CD4 (Coefficient 0.113, CI 95 %: 0.046, 0.179, p < 0.01), and the inverse of the CD4/CD8 ratio. The GEE model did not demonstrate significant changes in the GFR over a 3-year period. Findings were similar when comparing GFR at diagnosis with GFR at 12 (-3.9 mL/min/1.73m2, CI 95% -7.3, 0.4, p = 0.98), 24 (-2.47 mL/min/1.73m2, CI 95% -7.0, 2.1, p=0.85), and 36 months (0.39 mL/min/1.73m2, CI 95% -4.4, 5.2, p = 0.43) of follow-up., Conclusions: Patients with glomerular disease associated with HIV have stable GFR over a 3-year period, and low rates of progression towards dialysis requirement. Differences with previous reports could be related with early diagnosis and treatment with highly active antiretroviral therapy., Competing Interests: No Conflict of Interest is declared, (Copyright (c) 2020 Oscar Munoz-Velandia, Angel Garcia-Pena, Javier Garzon-Herazo, Kateir Contreras-Villamizar, Martha Rodriguez-Sanchez, Elias Garcia-Consuegra, Esteban Toro-Trujillo.)

Introduction: The diagnosis of cardiac sarcoidosis (CS) is difficult to ascertain due to the insensitivity of endomyocardial biopsy. Current diagnostic criteria require a positive endomyocardial biopsy or extra-cardiac biopsy with clinical features suggestive of CS. Common tests for diagnosis of pulmonary sarcoidosis include bronchoalveolar lavage (BAL), lung and mediastinal lymph node (MLN) biopsies. Our objective was to determine the diagnostic utility of these tests in patients with suspected CS and without prior history of pulmonary involvement., Methods: This retrospective cohort study included 37 patients without history of extra-cardiac sarcoidosis referred for suspected CS. All patients underwent chest computed tomography (CT) staged using the modified Scadding criteria, and had BAL, and/or lung or MLN biopsy. BAL cellular analyses with lymphocytes>15% and/or CD4/CD8 ratio≥ 4 were considered suggestive of sarcoidosis. The number of positive biopsies and BALs were compared between normal CT (Scadding stage 0) and abnormal CT (Scadding stage 1-4) groups., Results: A definitive diagnosis of sarcoidosis was ascertained in 18/31 (58%) patients undergoing lung or lymph node biopsy, and a potential diagnosis in 18/27 (67%) patients with BAL CD4/CD8>4 or lymphocytes>15%. Of the 12 patients in the normal CT group, 4/10 (40%) had positive lung biopsies, and 9/12 (75%) patients had either positive biopsy or BAL criteria., Conclusions: In suspected cardiac sarcoidosis, a diagnosis of extra-cardiac sarcoidosis was ascertained in a majority of patients irrespective of degree of lung involvement on chest CT. Our results support referral for pulmonary biopsy/bronchoalveolar lavage in suspected CS to confirm the diagnosis of sarcoidosis., (Copyright © 2018. Published by Elsevier Ltd.)

Introduction: The objective was to identify comorbidities related to HIV-positive patients in Blumenau, State of Santa Catarina., Methods: A retrospective, descriptive observational design study which analyzed data from 424 patients assisted by the sexually transmitted disease/acquired immunodeficiency syndrome (STD/AIDS) Specialized Care Service (SCS)., Results: Of 424 medical records analyzed, 388 patients presented CD4+/CD8+ ratios lower than 1. The most prevalent comorbidities were smoking, depression, alcoholism, and herpes zoster infection, in males and females., Conclusions: The most relevant comorbidity in both genders was herpes zoster, an important marker of immunity in patients. The lowest mean was observed among patients with neurotoxoplasmosis.

Background: Despite mixed results in the literature, some clinicians continue to consider an elevated CD4/CD8 ratio in bronchoalveolar lavage (BAL) fluid to be supportive of a diagnosis of sarcoidosis. However, the CD4/CD8 ratio in mediastinal lymph nodes involved by sarcoidosis has not been extensively studied. The primary aim of this study was to evaluate the utility of the CD4/CD8 ratio in mediastinal lymph node aspirates obtained by endobronchial ultrasound-guided transbronchial needle aspiration (EBUS-TBNA) for diagnosing sarcoidosis., Methods: Our archives were searched for EBUS-TBNAs in which mediastinal lymph node aspirates had been submitted for flow cytometry (n=160). Clinical and pathologic findings in these cases were reviewed retrospectively. Cases were included in the study if they had (1) a clinical diagnosis of sarcoidosis supported by cytopathologic confirmation of non-necrotizing granulomas in EBUS-TBNA-derived lymph node aspirates (23 cases), or (2) a pathologically confirmed non-neoplastic diagnosis other than sarcoidosis (7 cases). Cases that did not fulfil these criteria were excluded (130 cases)., Results: The CD4/CD8 ratios in mediastinal lymph nodes and BAL fluid were compared. The CD4/CD8 ratio was elevated in mediastinal lymph nodes in 12/23 (52%) cases of sarcoidosis and 3/7 (43%) pathologically confirmed nonsarcoid cases. BAL fluid had been concurrently submitted for flow cytometry in 20/23 cases of sarcoidosis and 5/7 nonsarcoid cases. CD4/CD8 was elevated in BAL fluid in 9/20 (45%) cases of sarcoidosis and 2/5 (40%) nonsarcoid cases., Conclusion: As in BAL fluid, the CD4/CD8 ratio in mediastinal lymph nodes involved by sarcoid granulomas is highly variable and does not reliably confirm or exclude sarcoidosis.

In HIV-infected patients a low CD4:CD8 ratio can persist despite CD4 recovery with long-term antiretroviral treatment (ART). As CD4:CD8 inversion is considered a marker of immune-senescence, we aimed to assess if it was associated with the chronic inflammation state in aging patients with HIV. A total of 112 patients with a >15 year history of HIV infection and ART were included, 85 of whom were suppressed. All subjects were tested for interleukin (IL)-6, high-sensitivity (hs)-PCR, and D-dimer levels. Complete clinical, therapeutic, and hematochemical data were retrieved. Coreceptor tropism based on HIV-DNA gp120 genotyping was also available within the past 6 months. A progressive increase in the CD4:CD8 ratio over time was observed without reaching a plateau. Based on the CD4:CD8 ratio at the time of testing, patients were classified into group A (normal ratio ≥0.9) and group B (<0.9). A normal ratio was observed in 37% of patients. Variables associated with an inverted CD4:CD8 ratio were older age, nadir CD4, and detectable HIV viremia. No association between HIV subtype, coreceptor tropism, cytomegalovirus (CMV), hepatitis B virus (HBV), and hepatitis C virus (HCV) coinfections and CD4:CD8 ratio was observed. Group B patients showed a trend for a higher frequency of diabetes and hypertriglyceridemia compared to group A patients, but they did not differ in IL-6, hs-PCR, and D-dimer levels or in frequency of severe non-AIDS-associated events. In conclusion, CD4:CD8 ratio normalization occurs rarely, even after several years of ART. Chronic inflammation in patients aging with HIV does not seem to be directly dependent on the CD4:CD8 ratio. However, the persistent immune dysregulation expressed by a CD4:CD8 inversion might be linked to a higher risk of non-AIDS events, especially metabolic disorders.

Idiopathic aplastic anemia (AA) is an immune-mediated bone marrow failure syndrome. Immune abnormalities such as decreased lymphocyte counts, inverted CD4/CD8 T-cell ratio and increased IFN-γ-producing T cells have been found in AA. CD30, a surface protein belonging to the tumor necrosis factor receptor family and releasing from cell surface as a soluble form (sCD30) after activation, marks a subset of activated T cells secreting IFN-γ when exposed to allogeneic antigens. Our study found elevated BM plasma levels of sCD30 in patients with SAA, which were closely correlated with disease severity, including absolute lymphocyte count (ALC) and absolute netrophil count (ANC). We also noted that sCD30 levels were positively correlated with plasma IFN-γ levels and CD4/CD8 T-cell ratio in patients with SAA. In order to explain these phenomena, we stimulated T cells with alloantigen in vitro and found that CD30+ T cells were the major source of IFN-γ, and induced CD30+ T cells from patients with SAA produced significantly more IFN-γ than that from healthy individuals. In addition, increased proportion of CD8+ T cells in AA showed enhanced allogeneic response by the fact that they expressed more CD30 during allogeneic stimulation. sCD30 levels decreased in patients responded to immunosuppressive therapy. In conclusion, elevated BM plasma levels of sCD30 reflected the enhanced CD30+ T cell-mediated immune response in SAA. CD30 as a molecular marker that transiently expresses on IFN-γ-producing T cells, may participate in mediating bone marrow failure in AA, which also can facilitate our understanding of AA pathogenesis to identify new therapeutic targets.

Laboratory tests for pulmonary sarcoidosis (percentage lymphocytes and CD4/CD8 ratio in bronchoalveolar lavage fluid and serum angiotensin-converting enzyme activity) lack sensitivity and specificity. In a retrospective study of 153 subjects under suspicion of pulmonary sarcoidosis (36 cases and 117 patients with other diseases [control patients]), we defined likelihood ratios (LRs) for rationally selected result intervals of these tests, which improve clinical interpretation as compared with dichotomous interpretation based on a single cutoff value. By using logistic regression analysis, we further integrated the 3 individual tests into a unified algorithm that could rule out diagnosis in 57 (48.7%) of the 177 control subjects and confirm diagnosis in 12 (33%) of the 36 pulmonary sarcoidosis cases. We conclude that use of LRs improves interpretation of laboratory tests for pulmonary sarcoidosis. In addition, we present a prediction algorithm based on the combination of laboratory tests that helps clinicians confirm or exclude diagnosis in almost half of the study population.

Background & Objectives: The enumeration of CD4 and CD8 positive cells, surrogate markers for HIV disease progression, is helpful in management and follow up of immunocompromised HIV-positive patients. In assessing the degree of immune deficiency in HIV-positive patients of a particular region, knowledge of reference range of T-cell subset counts of healthy individuals of that particular region is essential. The present cross-sectional study was undertaken to determine the reference range of T-cell subsets in healthy north Indians and to compare the values with those in HIV-positives., Methods: Blood samples from 125 HIV seronegative healthy volunteers comprising group I (88 males, 37 females) and 452 HIV- positive patients, divided into group II of asymptomatic (n=137; 93 males, 44 females) and group III of AIDS patients (n=315; 253 males, 62 females) in the age group of 17-60 yr, were analysed for enumeration of CD4+, CD8+ cells/microl by flow cytometry., Results: In group I, the CD4 and CD8 levels were 687 +/- 219 and 611 +/- 288 cells/microl in males and 740 +/- 255 and 546 +/- 246 cells/microl in females. Overall, a significant depressed level of CD4 (525 +/- 207 cells/microl) and elevated level of CD8 (1174 +/- 484 cells/microl) in group II and (170 +/- 115 and 1051 +/- 586 cells/microl) respectively in group III were observed. Group II patients had highest level of CD8 cells. No asymptomatic women had CD4 count of <200 cells/microl., Interpretation & Conclusion: Our findings on T-cell subset reference ranges of normal healthy north Indians validate the utility of determination of CD4 cell count as a useful predictor of AIDS in Indian conditions and confirm that a significant per cent of AIDS patients had CD4 cell count below 200/microl.

Unlabelled: Sarcoidosis is characterized by an accumulation of the activated lymphocytes in affected organs. The aim of the study was the analysis of lymphocytes activation markers in a bronchoalveolar lavage fluid (BALF) in sarcoidosis and the influence of the disease outcome on the changes of cells subpopulations., Material and Methods: We performed the study on 12 patients with the regression of sarcoidosis after the mean period of the observation 8.1 +/- 3.8 months., Results: We observed a tendency toward a BALF cellularity normalization: lowering of the percentage of CD4+ lymphocytes (mean: 67.1% vs. 57.8%, p = 0.047), lowering of the CD4+/CD8+ ratio (mean: 6.3 +/- 5.4 vs. 3.7 +/- 5.2, p < or = 0.05), lowering of the percentage of HLA-DR+ lymphocytes (mean: 65% < or = 16.4 vs. 43.9% +/- 18.0, p = 0.05), lowering of the percentage of CD25+ lymphocytes (mean: 5.7% vs. 3.1%, p < or = 0.05) and CD4+CD25+ (mean: 4.0% vs. 2.4%, p = 0.011)., Conclusion: The clinical improvement of sarcoidosis is accompanied by the lowering of the percentage of activated lymphocytes in BALF.

In Africa tens of millions of people are HIV+. Prevention alone is not effective, and needs to be coupled with anti-retroviral treatment (HAART). Laboratory tests as CD4+ T cell count are fundamental tools in HIV disease monitoring, but they require costly equipment, reagents and specialised manpower. The goal of this study was to minimise and optimise the reagents needed for a reliable routine CD4+ cell count in a resource-poor setting (Mozambique). Panleucogating protocol (PLG), requires two antibodies only, CD45 and CD4, or three if CD8 is requested for special clinical reasons. PLG was compared with the current protocol used in two Mozambique hospitals, based on FSC/SSC gating and CD3/CD4/CD8 staining. 189 samples from HIV+ patients, included in the Community of Sant'Egidio's DREAM program and on HAART were processed with both protocols. The overall correlation of the lymphocyte subsets measurements was satisfactory, with r2 always >0.96. The Bland-Altman analysis of CD4+ cell count showed a negative bias when CD4+ cells were <15%, due to the imprecise FSC/SSC gating used previously. When CD4+ cells were >15% the negative bias tended to zero, further confirming the better quality of the PLG gating strategy. Two- or three color PLG protocol, in double platform, currently seems the most accurate and affordable method to monitor CD4+ lymphocytes and CD4/CD8 ratio by flow cytometry in resource-poor medical settings.

Marine algae-derived sulfated polymannuroguluronate (SPMG), a candidate drug for AIDS treatment, was intraperitoneally injected into normal mice for 6 weeks, and the in vivo and in vitro mechanisms of SPMG for immunomodulation were investigated in isolated lymphocytes by MTT assay, flow cytometry, and surface plasmon resonance assay. SPMG treatment at 5 and 10 mg/kg enhanced concanavalin A (ConA)-induced T cell proliferation, cellular levels of CD69, interleukin-2 (IL-2), and interferon-gamma (IFN-gamma), as well as CD4/CD8 ratio, while decreasing tumor necrosis factor-alpha (TNF-alpha) level in T cells of peripheral blood mononuclear cells. In addition, 1 molecule of SPMG bound to 2/3 molecules of IL-2 with a K(D) of 9.53 x 10(-7) M. Heparin prevented SPMG binding to IL-2 by 72.2%; thus, to a large extent, SPMG and heparin share common binding sites on IL-2. In contrast, other glycosaminoglycans (e.g., chondroitin sulfate and dermatan sulfate) had little effect on SPMG and IL-2 interaction, suggesting the requirement of a defined sequence within the sugar chain for specific recognition of IL-2. Concomitant treatment of IL-2 and SPMG augmented lymphocyte proliferation, compared with IL-2 alone; in contrast, SPMG alone had no proliferative effect. Taken together, our findings demonstrated for the first time that SPMG exerted its immunomodulation by direct activation of T cell function, accompanied by simultaneous modulation of cytokine function, which suggests that SPMG would show great promise for use in anti-AIDS therapy.

CD4-CD8 ratio is an important diagnostic measure of immune system functioning. In particular, CD4-CD8 ratio predicts the time taken for progression of HIV infection to acquired immune deficiency syndrome (AIDS) and the long-term survival of AIDS patients. To map genes that regulate differences between healthy individuals in CD4-CD8 ratio, we typed 757 highly polymorphic microsatellite markers at an average spacing of approximately 5 cM across the genome in 405 pairs of dizygotic twins at ages 12, 14 and 16. We used multipoint variance components linkage analysis to test for linkage between marker loci and CD4-CD8 ratio at each age. We found suggestive evidence of linkage on chromosome 11p in 12-year-old twins (LOD=2.55, P=0.00031) and even stronger evidence of linkage in the same region at age 14 (LOD=3.51, P=0.00003). Possible candidate genes include CD5 and CD6, which encode cell membrane proteins involved in the positive selection of thymocytes. We also found suggestive evidence of linkage at other areas of the genome including regions on chromosomes 1, 3, 4, 5, 6, 12, 13, 15, 17 and 22.

Androgens influence some immunological processes, including alternation of the number and function of the circulating lymphocytes and monocytes. In the present study, the effects of three different doses of testosterone on the numbers and percentages of the peripheral blood cells were investigated; the lymphocyte subsets were determined and the proliferation of lymphocyte was detected. Groups of Sprague-Dawley rats were treated with 0.5, 2.5, 12.5 mg/kg or only vehicle, respectively. Compared with controls, the results of complete blood counts showed that the absolute and relative numbers of monocytes decreased. The lymphocyte subpopulations determined by flow cytometry indicated an increase in CD8+ T cells, whereas the CD3+, CD4+ and CD4+CD8+ T cells remained unchanged. Thus, the immunoregulatory index (CD4+/CD8+ ratio) decreased. The proliferative activities determined by MTT assay were down-regulated. In conclusion, the immunosuppressive effects of testosterone may be attributed to a decline in number of monocytes, CD4+/CD8+ ratio and proliferative activities together with an increase of CD8+ T cells in Sprague-Dawley rats.

The expression of CCR5 and CXCR3, two chemokine receptors involved with homing of T cells to inflamed tissue, was examined longitudinally on CD4+ and CD8+ T cells in patients with a first demyelinating event of the central nervous system (CNS) randomized to receive i.m. injections of interferon-beta1a (IFN-beta1a) or placebo. Blood for analysis was collected before and 48 h after injection at baseline and after 3 and 12 months of treatment. The results showed that treatment with IFN-beta1a did not affect numbers of T cells expressing CCR5 and CXCR3 during the first 12 months of treatment, either at the peak of biological response or at the trough of interferon effect, at steady-state.