unresponsiveness to hepatitis b surface antigen (hbsag) has been shown to be associated with dysfunction of the presenting cells (apc) and defect in the specific b-lymphocyte and/or t-lymphocyte repertoires.   direct determination of the frequency of specific t-lymphocytes together with complementary analysis of the naive circulating immune cells could provide valuable information about the cel...

The aim of this study was to evaluate the immune system and lymphocyte function in 41 Iranian β-thalassemic patients and 50 controls, ages ranging from 2 to 18 years. The patients consisted of 20 splenectomized and 21 non-splenectomized patients. They were treated with Desferal, and had received repeated blood transfusion. Laboratory investigations included measurement of total T lymphocyt...

systemic lupus erythematosus (sle) is a chronic autoimmune disease which results in damage to various organs. some animal studies have revealed that activation of toll-like receptors (tlrs) is important in the pathogenesis of sle. in the present study, the percentage of different immune cell subsets in 35 sle patients and 38 control subjects was analyzed by flow cytometry. we also assessed the ...

Background: Based on the hypothesis that IgGs are potent tolerogens and that immature lymphohematopoietic antigen-presenting cells (APC), and even mature peripheral B cells, may be effective APC for tolerance induction, we designed an immunoglobulin fusion protein retroviral expression vector to test the role of B cells in a novel gene therapy strategy for the transfer of immune tolerance. Meth...

Many bursa-equivalent (B) lymphocytes of adult mice bear surface Ig and receptors for C3. The frequency of Ig-bearing cells increases rapidly immediately after birth, but these cells lack complement (C) receptors. Lymphocytes bearing C receptors are not found in the spleens of BALB/c, DBA/2, and C57BL/6 mice until 2 wk of age and do not attain substantial numbers until 3-4 wk of age. In AKR mic...

background: activated platelets shed microparticles (mps) in vivo and certainly in vitro under storage. like platelets, platelet-derived mps contribute to hemostatic and inflammatory responses. we sought to determine the interactions between platelet mps and peripheral b lymphocytes in the healthy blood circulation to propose a possible role for platelet mps in the functioning of b cells.   mat...

Human T and B lymphocytes differ morphologically and immunologically although little is known concerning their physiological parameters and biochemical constituents. In this study, microviscosity and lipid composition in normal human B and T lymphocytes were investigated. Microviscosity was examined using 1,6-diphenyl-1,3,5-hexatriene as a probe and lipid composition was analyzed by thin-layer ...