We have previously shown that the proliferative response of T cells to antigenic or mitogenic stimulus decreased with age and that caloric resection (CR) attenuated the age-related decline in proliferation and IL-2 expression. Because activation-induced apoptosis is known to regulate cell proliferation and eliminate the high number of activated cells during an immune response, it was of interes...

We have recently shown that peripheral blood T cells of multiple myeloma (MM) patients are very susceptible to stimulation of the T-cell receptor/CD3 complex with anti-CD3 monoclonal antibodies (MoAbs). CD3 stimulation is currently under clinical investigation as a nonspecific approach to boost antitumor effector mechanisms. The aim of this study was to determine whether the hyperreactivity of ...

T cells play a key role in the pathogenesis of type 1 diabetes, and targeting the CD3 component of the T-cell receptor complex provides one therapeutic approach. Anti-CD3 treatment can reverse overt disease in spontaneously diabetic non-obese diabetic mice, an effect proposed to, at least in part, be caused by a selective depletion of pathogenic cells. We have used a transfer model to further i...

T-lineage acute lymphoblastic leukemia (T-ALL) cells have abundant cytoplasmic CD3/Ti but express low amounts on the cell surface and are deficient in CD3/Ti-mediated signal transduction. Nevertheless, plating T-ALL cells on dishes containing immobilized anti-CD3 monoclonal antibodies with a source of growth factors induced the expression of CD25 (interleukin-2 receptor alpha chain) and stimula...

Human thymocyte differentiation was examined by injecting fetal thymic progenitor populations into human thymic xenografts in SCID-hu mice. Thymic progenitors were fluorescently labeled with the lipophilic dye PKH2. The phenotypes of their progeny could be identified by flow cytometric analysis of cells with a very high fluorescent PKH2 signal. Intrathymic injection of purified triple negative ...

Large granular lymphocyte (LGL) leukemia is a rare disease characterized by clonal expansion of LGL associated with chronic neutropenia, multiple auto-antibodies, and occasionally polyarthritis. We studied cell surface antigen expression and functional activity of leukemic LGL from ten such patients. Using two-color flow cytometric analysis, we found that leukemic LGL from all ten patients expr...

Lipid rafts are important signaling platforms in T cells. Little is known about their properties in human CD8(+) T cells. We studied polarization of lipid rafts by digital immunofluorescence microscopy in primary human T cells, using beads coated with anti-CD3 and anti-CD28 mAbs (CD3/28 beads). Unlike CD4(+) T cells, CD8(+) T cells did not polarize lipid rafts when stimulated with CD3/28 beads,...

Diabetes mellitus is a metabolic disorder, which results from insufficient secretion of insulin and/or its action, thus leading to hyperglycemia. Liver damage known be among the most common complications type 2 diabetes (T2D) and in T1D. Comparison leukocyte phenotypes liver tissue with appropriate blood parameters may assess degree search for approaches correction destruction mellitus. Therefo...

Recent studies indicate that there may be functional uncoupling of the TCR-CD3 complex and suggest that the TCR-CD3 complex is composed of two parallel signal-transducing units, one made of gamma delta epsilon chains and the other of zeta chains. To elucidate the molecular mechanisms that may explain the functional uncoupling of TCR and CD3, we have analyzed their expression by using flow cytom...