Gene/Protein Disease Symptom Drug Enzyme Compound
Pivot Concepts: Gene/Protein Disease Symptom Drug Enzyme Compound   Target Concepts: Gene/Protein Disease Symptom Drug Enzyme Compound

---

Query: UMLS:C0021051 (immunodeficiency)
71,517 document(s) hit in 31,850,051 MEDLINE articles (0.00 seconds)

We measured apoptosis of subsets of T lymphocytes by single-cell analysis of caspase activation, to confirm high turnover of chemokine receptor CCR5(+) T cells in subjects with acute, primary human immunodeficiency virus type 1 (HIV-1) infection (PHI). High levels of spontaneous apoptosis, consisting mainly of CD8(+) T lymphocytes, were closely associated with increases in the activation markers Ki-67, CD38, and the HIV coreceptor CCR5 and with decreases in Bcl-2 and the interleukin (IL)-7 receptor at the single-cell level. Increased expression of Ki-67 and CCR5 ex vivo, as well as increased apoptosis, was seen in all T cell receptor beta-chain variable region (TCRBV) subfamilies studied. The addition of IL-2 or IL-15, but not IL-7, significantly inhibited caspase activation, increased Bcl-2 expression, and rapidly initiated proliferation in vitro of CD8(+) T cells expressing CCR5 and multiple TCRBV subfamilies. Furthermore, IL-15 receptor alpha-chain messenger RNA levels were increased in peripheral blood mononuclear cells during PHI. These results suggest that CCR5(+)Ki-67(+)Bcl-2(dim) activated T cells generated during PHI traffic via blood to tissue sites, where the cells may survive and/or further proliferate under the local influence of IL-2 or IL-15. Understanding cytokine effects on CCR5(+) T cells will be important in understanding chronic HIV-1 replication and pathogenesis.
...
PMID:Polyclonal proliferation and apoptosis of CCR5+ T lymphocytes during primary human immunodeficiency virus type 1 infection: regulation by interleukin (IL)-2, IL-15, and Bcl-2. 1275 Oct 31

T cell dynamics and viral genotype were studied in human immunodeficiency virus 1-infected individuals receiving antiretroviral therapy who were viremic and had either increasing (discordant immunological responders) or decreasing (nonresponders) CD4(+) T cell counts. A comparison was made with treated individuals who were not viremic and had increasing CD4(+) T cell counts (complete responders). Nonresponders had higher CD4(+) T cell proliferation (as assessed by Ki67 expression) and immune activation (as assessed by CD38 and human leukocyte antigen-DR expression), together with a reduction in T cell receptor excision circles, compared with discordant immunological responders and complete responders, which suggests that there is enhanced viral pathogenicity in both peripheral T cells and the thymus. Although there was a high prevalence of mutations in the protease and reverse transcriptase genes in discordant immunological responders, these changes were also observed in nonresponders.
...
PMID:Immunological and virological failure after antiretroviral therapy is associated with enhanced peripheral and thymic pathogenicity. 1279 68

During 6 months of treatment, we measured human immunodeficiency virus (HIV)-1 virus loads, CD4 T cell counts, and immune activation markers, in 111 HIV-1-infected patients with active tuberculosis (TB). The median virus load (baseline, 5.58 log(10) copies/mL) significantly increased at 1 month (5.71 log(10) copies/mL), then returned to near-baseline levels at 3 months (5.40 log(10) copies/mL) and at 6 months (5.36 log(10) copies/mL). In contrast, the median CD4 counts increased at 1 month (186/mm(3)), at 3 months (238/mm(3)), and at 6 months (239/mm(3)). CD4 counts and virus loads did not change during therapy. Expression of CD38 and HLA-DR remained high throughout treatment, whereas plasma levels of interleukin-6 decreased over time.
...
PMID:Human immunodeficiency virus-1 RNA levels and CD4 lymphocyte counts, during treatment for active tuberculosis, in South African patients. 1279 75

The present study assessed antiviral T cell immune responses in 48 human immunodeficiency virus (HIV)-infected children with a stable or decreasing CD4(+) T cell counts and different levels of viral control, in the presence or absence of antiretroviral therapy. Children with full (<40 copies/mL) or partial (<50,000 copies/mL) virus suppression and with a history of stable CD4(+) T cell counts had significantly increased levels of anti-HIV CD4(+) T cell lymphoproliferative responses, lower levels of CD38(+), and higher CD8(+)/CD28(+) T cell percentage, compared with those in treated children with a lack of virus suppression (>50,000 copies/mL). Levels of anti-HIV CD8(+) T cell activity, although higher in treated children with a lack of virus suppression, were not significantly different between the groups. Although levels of anti-HIV CD4(+) and CD8(+) T cell responses were not associated, these levels of responses were associated with the percentage of specific T cell subsets. Overall, a history of stable CD4(+) T cell counts, as a result of therapy that imparted full or partial virus suppression, was associated with increased levels of anti-HIV CD4(+) T helper responses and decreased T cell activation.
...
PMID:Presence of human immunodeficiency virus-1-specific CD4 and CD8 cellular immune responses in children with full or partial virus suppression. 1296 19

The aim of this study was to assess whether the density of CD38 antigen expression on CD8+ T cells can be used as a marker of activation of the immune system in Human immunodeficiency virus 1 (HIV-1)-positive patients treated with highly active antiretroviral therapy (HAART). T cell subsets, expression of CD38 antigen on CD8+T cells, HIV-1 viral load and stage of the disease were analyzed at baseline and after 12 months of HAART in 24 HIV-1-infected patients. Our data showed that the use of HAART is effective in reducing plasma viral load and in achieving a stable CD4+ count and percentage of CD8+/CD38+ cells. The percentages of CD8/CD38+ cells in HIV-1-infected patients at baseline and after 12 months of HAART were significantly higher than those of controls. Analysis of the density of CD38 expression revealed that it was due to CD8+/CD38+ subsets with low and medium density of antigen expression. Absolute number of CD4+ T cells correlated negatively with the percentage of CD8+/CD38+ cells at baseline of the study. Persistent up-regulation of the CD38 expression on CD8+ T cells and its correlation with the decreased CD4+ count despite the reduction of plasma viral load may reflect residual replication of HIV-1 in reservoirs. Thus, this immunological parameter can serve as a biological marker of HIV-1 infection and might have utility in clinical management of HIV-1-infected persons.
...
PMID:Cd38 expression on Cd8+ T cells in Human immunodeficiency virus 1-positive adults treated with HAART. 1452 79

We compared immune restoration in patients who suppressed human immunodeficiency virus type 1 replication after treatment with a protease inhibitor (PI) plus nevirapine or with 3 nucleoside reverse-transcriptase inhibitors (NRTIs) plus nevirapine. Changes in total and memory CD4 and CD8 cells were similar in the groups, as were decreases in immune activation (e.g., CD38 and HLA-DR) and increases in CD28 expression. Increases in naive CD4 and CD8 cells tended to be greater in the NRTI-treated group, with differences in naive CD4 cells significant at weeks 8 and 12 (P<.05) but not at week 48. Lymphocyte apoptosis decreased in both groups, but the week-1 decrease was greater in the PI-treated group (P<.02). Lymphocyte proliferation and skin-test responses were comparable. We find little evidence for differences in the major direct immunologic effect of PI versus NRTI regimens and propose that effects observed elsewhere were indirect, mediated through antiviral activity or adaptation of the virus to selection pressure.
...
PMID:Immune reconstitution is comparable in antiretroviral-naive subjects after 1 year of successful therapy with a nucleoside reverse-transcriptase inhibitor- or protease inhibitor-containing antiretroviral regimen. 1462 69

An observational study of children vertically infected with human immunodeficiency virus type 1 (HIV-1) was performed to determine the role of CD38 expression in CD8(+) T cells as prognostic marker of virological failure in children receiving HAART. We studied 42 children who were receiving antiretroviral therapy and who had an undetectable virus load (uVL), and we found a negative correlation between CD38 expression in CD8(+) T cells and the duration of uVL. We selected 17 HIV-1-infected children with CD38 values close to the baseline level (i.e., the first uVL achieved), and we distributed the children into 2 groups on the basis of median CD38 value in CD8(+) T cells. Children with CD38 values in CD8(+) T cells that were higher than the median had a higher incidence and relative risk of virological failure than did those with values lower than the median. In conclusion, we demonstrate for the first time that CD8(+)CD38(+) T cell count is a good prognostic marker of therapeutic failure in HIV-1-infected children.
...
PMID:CD38 expression in CD8+ T cells predicts virological failure in HIV type 1-infected children receiving antiretroviral therapy. 1472 14

We report a case of plasmablastic lymphoma presenting in cervical lymph nodes in an 82-year-old, human immunodeficiency virus-negative man. Cytologic and histologic examinations demonstrated a large cell lymphoma with plasmacytic differentiation. The tumor cells were positive for CD138, CD38, epithelial membrane antigen, CD30, and lysozyme, but lacked expression of leukocyte common antigen, T-cell, and B-cell markers. Abundant Epstein-Barr virus-encoded RNA transcripts were identified by in situ hybridization. A monoclonal rearrangement of kappa-light- chain gene was demonstrated. The cytologic, histologic, immunohistochemical, and molecular features of plasmablastic lymphoma are reviewed. The potential diagnostic pitfalls and differential diagnoses, especially in a fine-needle aspiration specimen, are addressed.
...
PMID:Plasmablastic lymphoma of the cervical lymph nodes in a human immunodeficiency virus-negative patient: a case report and review of the literature. 1508 96

In this report we evaluated CD4(+) T, CD8(+) T and natural killer (NK) cell counts, the levels of naive/memory subsets within the CD4(+) T lymphocyte population, expression of CD38 on T lymphocytes, and CD4(+) and CD8(+) T cell cytokine production in two girls with hyper-IgM (HIM) syndrome. Both girls developed recurrent infections early in infancy, presenting a wide spectrum of clinical manifestations, with a strikingly different disease severity between them. CD4(+) T cell counts were low in both children (patient 1: 214 cells/mm(3) and patient 2: 392 cells/mm(3)), and the CD4/CD8 T cell ratio was 0.4 for patient 1, the patient with the more severe disease, and 1.4 for patient 2. NK cell numbers were low in patient 1 (60 cells/mm(3)) and borderline (286 cells/mm(3)) with regard to normal levels in patient 2. An imbalance of naive and memory/effector cell subsets was found in both girls, with the percentage of CD45RA(+) 27(+) (naive) CD4(+) T lymphocytes being 5.8 and 12.4 for patients 1 and 2, respectively. Expression of CD38 on the surface of T lymphocytes was low in patient 1. Detection of intracellular interferon (IFN)-gamma and tumour necrosis factor (TNF)-alpha in CD4(+) and CD8(+) T lymphocytes upon PMA-Io stimulus was preserved in both children. In conclusion, we found low numbers of CD4(+) T lymphocytes and a dramatic redistribution of naive and memory/effector CD4(+) T lymphocytes in two girls with non-X-linked HIM syndrome. Furthermore, we found low expression of CD38 on T lymphocytes and low numbers of NK cells in the patient with the more severe disease, indicating a possible role for these cells in the pathogenesis of this immunodeficiency.
...
PMID:An imbalance of naive and memory/effector subsets and altered expression of CD38 on T lymphocytes in two girls with hyper-IgM syndrome. 1508 93

The main topic of this article is B cell development and differentiation, with a special focus on the mechanisms and molecules that regulate the expression of humoral immunity. Molecular epidemiological analysis was performed on the genes responsible for the X-linked agammaglobulinemia (XLA) phenotype of the majority of Italian patients and their distinct mutations were characterized. Mutations in Bruton's tyrosine kinase (BTK), a member of Tec Family of protein tyrosine kinases, have been found to be mainly responsible for XLA disease. The exact function of BTK in signal transduction is not yet known; thus, the specific role of BTK in receptor-dependent calcium signaling and the pro-antiapoptotic regulatory activity was addressed by transfecting RAMOS-1, a BTK-deficient human Burkitt's/B cell leukemia line with wild-type and mutant constructs. This work may provide clues about critical sites in the molecule and give support for gene therapy as a potential successful approach to XLA. Another aspect of this research is the identification and dissection of the molecular events that are likely to be directly related to the ability to express various isotypes of immunoglobulin with differing function and certain B cell immunodeficiency, mainly common variable disease and non-X-linked hyperIgM. B cell development and maturation steps in different compartments of the immune system are tracked by the analysis of cell-surface molecules and components of the signal transduction pathways, i.e. CD40, CD30, CD27, CD38, CD22 and CD24. A few components involved in B cell development, maturation and differentiation and their specific functional role are at least partially known, but these are far from fitting into an understandable pathway at present.
...
PMID:Insight into B cell development and differentiation. 1517 20


<< Previous 1 2 3 4 5 6 7 8 9 10 Next >>

---