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Aidsmap | Autologous CD8 T-cell infusion CD8 T-cells are immune cells which play a key role in the cellular immune response (as opposed to the humoral immune response, which involves antibodies). CD8 T-cells also seem to have non-cytotoxic activity against HIV - that is HIV replication is stopped without infected cells being killed. Walker (1986) reported that CD8 lymphocytes are capable of suppressing the replication of HIV in autologous peripheral blood mononuclear cells of patients with AIDS. www.aidsmap.com /en/docs/FE83AFAE-1E87-41D8-8749-1EDB8B78CC51.asp   (1556 words)

Heat Shock Protein as a Vaccine Vehicle However, there is also some evidence from animal models of human autoimmune diseases, such as arthritis, that suggests that T cells which recognize mycobacterial hsp60 and may sometimes cross-react with self hsps and cause disease (Holoshitz et al., 1983 and 1984; Shinnick et al., 1988; van Eden et al., 1988; Young et al., 1988). We have recently demonstrated that hsp70 fusion proteins can elicit CD8+ CTL in the absence of CD4+ T lymphocytes and that this function resides in a 200-amino acid segment of TBhsp70, indicating that chaperone activity is not required (Huang et al., 2000). The similarity of CD8+ CTL responses to OVA.TBhsp70 in CD4-/- and wild-type mice suggests that hsp70 fusion proteins are relatively potent CD8+ CTL immunogens. web.wi.mit.edu /young/hsp   (2328 words)

Journal of Translational Medicine | Full text | CD8+ T lymphocyte responses target functionally important regions of ... In HIV-1 infection, virus-specific CD8 T cell responses are readily detected in peripheral blood and lymph nodes, but HIV-1 replication typically persists in the face of an exuberant CD8 response [1-3]. Thus, although the specific relationship between CD8 T cells and viral control in HIV-1 infection remains unclear, CD8 responses appear to be a critical component of an effective HIV-1-specific immune response [16,17]. Although Integrase peptides were targeted by CD8 T cells in HIV-1 infected subjects at three times the frequency of Protease peptides, comparison of CD8 T cell responses per unit protein length suggests that the relative targeting of the two proteins is similar (Figure 6). www.translational-medicine.com /content/2/1/15   (7340 words)

Review of Dr. JA Levy's work   (Site not responding. Last check: 2007-10-23) CD8+ T cells from HIV-1-infected individuals inhibit acute infection by human and primate immunodeficiency viruses. CD8+ cells from asymptomatic human immunodeficiency virus-infected individuals suppress superinfection of their peripheral blood mononuclear cells. CD8+ T lymphocyte control of HIV replication in cultured CD4+ cells varies among infected individuals. www.aidshivresearch.com /showlab.php?surname=Levy&initials=JA   (3839 words)

A cytotoxic T lymphocyte inhibits acquired immunodeficiency syndrome virus replication in peripheral blood lymphocytes. CD8+ (suppressor/cytotoxic) lymphocytes block replication of HIV-1 or the simian immunodeficiency virus of macaques (SIVmac) in PBL of infected individuals. We now show that these CD8+ lymphocytes undergo clonal expansion in vivo after AIDS virus infection of the individual, suggesting they may be antigen-specific T cells. Finally, physical contact is required for the CD8+ lymphocyte-mediated inhibition of AIDS virus replication, since this inhibitory function is blocked by anti-LFA-1 and anti-CD8 mAbs. www.aegis.com /aidsline/1989/jul/M8970263.html   (406 words)

Human protein: P01732 - T-cell surface glycoprotein CD8 alpha chain precursor (T-lymphocyte differentiation antigen ... The CD8 antigen is a cell surface glycoprotein found on most cytotoxic T lymphocytes that mediates efficient cell-cell interactions within the immune system. The CD8 antigen, acting as a coreceptor, and the T-cell receptor on the T lymphocyte recognize antigen displayed by an antigen presenting cell (APC) in the context of class I MHC molecules. Familial CD8 deficiency is a novel autosomal recessive immunologic defect characterized by absence of CD8+ cells, leading to recurrent bacterial infections. harvester.embl.de /harvester/P017/P01732.htm   (1328 words)

Bioline International Official Site (site up-dated regularly) Hence in association with the CD4^+- CD8^+ switch in cured patients it was also observed a slight, but not significant increase of IFN-gamma production at the end of therapy, as well as a striking significant decrease in the IL-4 production in cured patients. These results suggest that activation of CD8^+ T cells and production of IFN-gamma may have a beneficial effect in ATL, although we can not reject the possibility that the IFN-gamma detected in the culture supernatants would be produced by other cell types (e.g.: natural killer cells). In this case the CD8^+ T cell response seems to be involved in the mechanisms of protective immunity since there is evidence that the vaccine is able to induce protection in approximately 50% of cases (CMF Antunes et al. www.bioline.org.br /request?oc96075   (2227 words)

Curriculum Vitae The availability of a tractable animal model with a defined anti-tumor CTL response in vivo permits detailed analysis of the induction, immunoregulation, and tumoricidal mechanism(s) of the T cell subset that is critical in surveillance against virus-induced tumors. antiviral CD8+ T cell responses in neonatal mice: susciptibility to polyoma virus-induced tumors is associated with lack of cytotoxic function by viral antigen-specific T cells. CD8 binding to MHC class I molecules is influenced by T cell maturation and glycosylation. www.med.emory.edu /faculty/profile_cv.cfm?id=107   (839 words)

Medibolics This should not be surprising as CD8+ cells fight many of the microbes that cause diseases in humans. There were significant associations (P < 0.05) between survival and CD8+ T-cell counts, clinical AIDS stage, risk group, and antiretroviral drug regimen after baseline, but only the use of protease inhibitors had an independent effect on survival (hazard ratio [HR], 0.096; 95% confidence interval [95% CI], 0.094-0.097). When the study was restricted to patients never exposed to PIs, the parenteral route of disease transmission, high absolute CD8 + T-cell counts, and low serum levels of tumor necrosis factor alpha were independent predictors of survival in extremely advanced HIV1 disease. www.medibolics.com /HighCD8TCellsEqualImprovedSurvival.htm   (324 words)

page d'accueil ICA (1989) Differential L chain expression in the antibody responses to phosphorylcholine of adult bone marrow or peritoneum-derived B lymphocytes. (1989) Genetic polymorphism of rabbit VHa region: A new allotype, a108. (1989) Membrane IgM cross-linking is not coupled to protein kinase C translocation in WEHI-231 B lymphoma cells. www.pasteur.fr /recherche/unites/Imchan/publis.html   (4226 words)

IMMUNO-BE-LPT in Toxicology,143:125-140 Analyzing 40,000 lymphocytes insured adequate CD8+ cells for accurate cell cycle determinations considering that the percentage of cells in S phase was close to zero for lymphocytes cultured without treatment. The proliferation response to tetanus toxoid or beryllium was influenced by the addition of commercial serum or autologous plasma to the cell culture. Commercial human serum enhanced the CD8+ lymphocyte response to antigens as compared to autologous plasma, and this enhancement was occasionally enough to make the total lymphocyte response positive in a few cases even though the CD4+ lymphocytes did not respond. www.csm.ornl.gov /~frome/vgLPT/tox00   (6364 words)

Bioline International Official Site (site up-dated regularly) The CD8+ T cell subpopulation may also have a regulatory role, so that the CD4+/CD8+ ratio could represent not only the proportion of both cell types in the circulation but their functional balance in the immune response to mycobacteria (Orme et al. The aim of this report was to study the influence of BCG vaccination, in a country with high coverage of BCG vaccination, and T cell counts on tuberculin reactivity in HIV+ subjects. We speculate that alterations in the subpopulations of T lymphocytes, mainly the decreased number of CD4+ and the increase in CD8+ cells, may lead to a disbalance in the DTH responses. www.bioline.org.br /request?oc97048   (2535 words)

Lymphocyte subpopulations in bancroftian filariasis : activated(DR+) CD8+ T cells in patients with chronic lymphatic ...   (Site not responding. Last check: 2007-10-23) To examine the relationship between lymphocyte phenotypes and states of activation in patients with Bancroftian filariasis, dual colour flow cytometry and concurrent in vitro cell culture were performed on normal individuals (NV; n=15), and on patients with either asymptomatic microfilarraemia (MF; n=12) or elephantiasis (CP; n=11). T lymphocytes (CD8) in both patient groups were found to be within the range defined by clinically normal individuals. T lymphocytes may be involved in the pathogenesis of the chronic obstructed lymphatic form of this disease. www.trc-chennai.org /Publications/pub403.htm   (263 words)

References 1989 Stress proteins may provide a link between the immune response to infection and autoimmunity. Specificity of the proliferative response of human CD8 clones to mycobacterial antigens. 1999 CD8+ T cells mediate CD40-independent maturation of dendritic cells in vivo. web.wi.mit.edu /young/hsp/refs.html   (1653 words)

Eurekah.com   (Site not responding. Last check: 2007-10-23) In this section, we wish to make two broad points: (i) the host mounts the type of immune response best suited to eradicating the particular type of microbe which it faces; and (ii) the type of immune response mounted is dictated by the interaction of the infectious agent with the host's antigen presentation pathways. T cells bearing the appropriate TcR are irrevocably committed to divide, expand, develop their effector functions, and pass into the memory phase; it is important to note that no further antigen contact is required. T cell responses were detected against all 10 known epitopes, presented by at least 6 HLA alleles; promising though this may appear, the responses were not strong, and their induction required three doses of vaccine. www.eurekah.com /dbfiles/whitton09.html   (11053 words)

References CD8 T cell memory in B cell-deficient mice. Counting antigen-specific CD8 T cells: a reevaluation of bystander activation during viral infection. Differential requirements for survival and proliferation of CD8 naive or memory T cells. www-binf.bio.uu.nl /takumi/thesis/node64.html   (1375 words)

Publications   (Site not responding. Last check: 2007-10-23) Murine cytomegalovirus interference with antigen presentation has little effect on the size or the effector memory phenotype of the CD8 T cell response. Expansion and function of CD8+ T cells expressing Ly49 inhibitory receptors specific for MHC class I molecules. Expression of the Vb5.1 gene by murine peripheral T cells is controlled by MHC genes an skewed to the CD8+ subset. mcb.berkeley.edu /labs/raulet/publications.html   (3029 words)

Association of the Adaptor Molecule LAT with CD4 and CD8 Coreceptors Identifies a New Coreceptor Function in T Cell ... LAT was preferentially immunoprecipitated by CD8, whereas Lck was preferentially immunoprecipitated by CD4 (lanes 1 and 2). (AAA), CD8ß (BBB), and CD4 (444) molecules (references (20) and (44)) are schematically depicted by gray, hatched, or white bars and designated by a three-letter code indicating the origin of their extracellular, transmembrane (tmb), and intracellular domains. CD8, but was not induced by TCR engagement alone (Figure 4 B, lanes 1–6). www.jem.org /cgi/content/full/190/10/1517   (6080 words)

Microbiology & Immunology - Hung-Sia Teh   (Site not responding. Last check: 2007-10-23) Studies in TCR transgenic mice that expressed the cognate antigen for the transgenic TCR led to the identification of a population of self-specific CD8 T cells that are dependent on interaction with the cognate self-antigen for their development. Self-specific CD8 T cells comprise ~10% of the CD8 T cells in normal mice and they possess an activated/memory phenotype and exhibit characteristics of both T cells and NK cells. Furthermore, self-specific CD8 T cells utilize receptors of both the innate and adaptive immune systems in the destruction of syngeneic tumor cells. www.microbiology.ubc.ca /hsteh.htm   (913 words)

David Lewinsohn, M.D., Ph.D. The long term objectives of the laboratory are to investigate the basic cellular and molecular mechanisms of human CD8+ T cell responses to tuberculosis infection. Recently, we have characterized CD8+ T cells that are non-classically restricted in that they are neither HLA-A-, B-, or C-restricted, nor do they appear to utilize molecule CD1. In one PPD+ subject, the majority of the Mtb-specific CD8+ T cells were non-classically restricted, while a minority were classically HLA-restricted. www.ohsu.edu /vgti/lewinsohn.htm   (597 words)

A sicca syndrome in HIV infection: association with HLA-DR5 and CD8 lymphocytosis [see comments] A sicca syndrome with parotid enlargement, pulmonary insufficiency, and lymphadenopathy was seen in 12 patients infected with human immunodeficiency virus (HIV), only 1 of whom has had an opportunistic infection during 304 patient months of study. There was a striking increase in numbers of circulating CD8 lymphocytes and the prevalence of HLA-DR5 was greatly increased. In patients with this diffuse infiltrative lymphocytosis syndrome (DILS) the CD8 lymphocytosis, which probably depends on histocompatibility antigen status, may influence disease progression in HIV infection. www.aegis.com /aidsline/1989/dec/M89C0080.html   (354 words)

N.A.R.I. - National AIDS Research Institute, Pune, India   (Site not responding. Last check: 2007-10-23) The CD4 count was 743, the CD8 was 822 and the CD4/CD8 ratio was 0.9. There was a past history of genital ulcer disease in 1982 and jaundice in 1989 (lasted 2 months). The CD4 count was 313, the CD8 was 985 and the CD4/CD8 ratio was 0.32. www.nari-icmr.res.in /pr_virus_bank5.html   (800 words)

N.A.R.I. - National AIDS Research Institute, Pune, India   (Site not responding. Last check: 2007-10-23) The CD4 count was 20, the CD8 was 847 and the CD4/CD8 ratio was 0.03. The CD4 count was 32, the CD8 was 69 and the CD4/CD8 ratio was 0.5. The CD4 count was 71, the CD8 was 828 and the CD4/CD8 ratio was 0.08. www.nari-icmr.res.in /pr_virus_bank8.html   (680 words)

Early gene m18, a novel player in the immune response to murine cytomegalovirus -- Holtappels et al. 83 (2): 311 -- ... CD8 T cells were measured by stimulation with the antigenic Memory was assessed for the CD8 T cell population in the spleen Contribution of the m18 peptide to the CD8 T cell response. vir.sgmjournals.org /cgi/content/full/83/2/311   (3188 words)

Low CD4 counts in normal human pregnancy These include any infections that the women may have experienced, the traumatic effects of C-sections which are normally performed on HIV-positive women to prevent neonatal transmission, or the potentially severe psychological stress of worrying if their baby will also be HIV-positive, which can take up to 18 months to determine. In 1989 a study was published of normal pregnancy which found reduced CD4 percentages in the 1st and 2nd trimester, as well as reduced CD4/CD8 ratios in the 2nd trimester (Castilla et al. 1989, page 104), but in fact they did not consider any of the factors described in this paper, such as infections, trauma, overexercising, normal daily variation, or psychological stress. www.pahealthsystems.com /message55573.html   (2395 words)

CD8 Coreceptor Extinction in Signaled CD4+CD8+ Thymocytes: Coordinate Roles for Both Transcriptional and ... CD8 Coreceptor Extinction in Signaled CD4+CD8+ Thymocytes: Coordinate Roles for Both Transcriptional and Posttranscriptional Regulatory Mechanisms in Developing Thymocytes -- Cibotti et al. The intensity of hybridization signals calculated by densitometric analysis was normalized to the 18S rRNA level (itself unchanged) and then used to calculate the percentage of specific RNA remaining. A region in the CD8 gene locus that directs expression to the mature CD8 T cell subset in transgenic mice. mcb.asm.org /cgi/content/full/20/11/3852   (4814 words)

Bristol University - Clinical Science @ North Bristol - Publications for 1989   (Site not responding. Last check: 2007-10-23) Lampeter, E. F., Signore, A., Gale, E. and Pozzilli, P. 1989, ‘Lessons from the NOD mouse for the pathogenesis and immunotherapy of human Type I (insulin-dependent) diabetes mellitus’, Diabetologia, vol. Bingley, P. and Gale, E. 1989, ‘Prediction of Type I Diabetes: the Bart's-Windsor Family Study’ in Immunotherapy of Type I Diabetes, eds D. Andreani, H. Kolb and P. Pozzilli, John Wiley and Sons, 137-145. Bingley, P. J., Tarn, A. and Gale, E. 1989, ‘A prospective family study of type 1 diabetes in the United Kingdom: An update after eight years’, in Prognosis of Diabetes in Children, Pediatr. www.bris.ac.uk /clinicalsciencenorth/diabetes/publications/1989   (491 words)

Bioline International Official Site (site up-dated regularly) 1989) and that a mild T cell depletion with anti-CD6 mAb may explain its low rate of graft failure compared to other methods (Voltarelli et al. Finally, the presence of residual thymic function was shown to be required for the reconstitution of the CD4 T helper subset, but not for the CD8 T cytotoxic/suppressor subset (Heitger et al. In addition, autologous transplantation of FACS-sorted CD34+ cells from peripheral blood resulted in delayed immune reconstitution, decreased diversity of Vb TCR expression in all patients and an increase of TCR gd T cells and of CD5+ B cells in one third of patients compared to unmanipulated grafts (Bomberger et al. www.bioline.org.br /request?oc00066   (7706 words)

FUNCTIONAL ROLE OF CD8+ LYMPHOCYTES IN SIMIAN IMMUNODEFICIENCY VIRUS INFECTION OF RHESUS MONKEYS Activated CD8+ lymphocytes were present in increased numbers in the paracortex of lymph nodes of SIV-infected rhesus monkeys with a lymphadenopathy syndrome, and SIV was isolated more readily from CD8+ lymphocyte-depleted peripheral blood lymphocytes (PBLs) of SIV-infected animals than from their unfractionated PBLs. In fact, CD8+ lymphocytes from SIV-infected rhesus monkeys, but not uninfected rhesus monkeys, blocked SIV replication in vitro in PBL populations. These findings suggest that the CD8+ cell that exerts this effect is either an activated lymphocyte or a memory lymphocyte. www.aegis.com /aidsline/1989/mar/M8930543.html   (470 words)

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