The cooperating preference of helper T cells originating from F1 bone marrow, but differentiating in adult thymectomized, lethally irradiated F1 recipients reconstituted with either f1 or homozygous parental thymus grafts was investigated. Cooperating preference was assayed by determining the levels of helper activity provided by antigen-primed T cells derived from such thymic chimeras for hapt...

Cooperation between thymus-derived (T) a lymphocytes and non-thymus-derived (B) lymphocytes has been shown to be necessary for the antibody response to protein antigens in experimental animals (1) and in man (2). Supernates of antigen-stimulated T cells can replace T cells for the in vitro antibody response by B cells (3). Two classes of T-ceU helper factors have been demonstrated in experiment...

UNLABELLED  Objective. This study describes the immunological response in the dermal layer of the peri-colostomic region, and identifies and quantifies the cellular elements present. METHODS Forty-one patients with colostomies present for more than 8 weeks were included. Thirty-one patients were men (75.6%) and 10 were women (24.4%) with an average age of 49.9 years. Thirty-four patients (...

background: the aim of preliminary study was determined development process status of t-cell population lymphocytes in ukrainian children after 22 years from chernobyl accident for next feasibility study. material and method: 150 participants aged 6 to 16 years are included in three groups: group i (n=65), 30 to 60 km from center accident at zone 3th, group ii (n=65) 60 to 90 km from same locat...

Lymph node (LNL) and salivary gland lymphocytes (SGL) from three patients with pseudolymphoma and primary Sjögren's syndrome (1(0)SS) were characterized with monoclonal antibodies to demonstrate (a) a predominance of T cells (greater than 80%) reactive with anti-T cell antibodies OKT4 (greater than 70%) and OKT8 (less than 20%); (b) a high prevalence of activation antigens (greater than 50% of ...

Cells of the immune system provide particularly fruitful subjects for the study of lineage commitment. Both T and B lymphocytes undergo complicated patterns of differentiation from uncommitted, nonfunctional precursor cells to highly sophisticated effector cells. The development of the helper T lymphocyte is one of the most elegant examples of this. A little over a decade ago, Mosmann and Coffm...

Most immunologists agree that CD8 T cells are important in controlling viruses, at least after the first week of infection – the time it takes for naive CD8 T cells to expand and differentiate into antiviral cytotoxic T lymphocytes (CTL). Nonetheless, CD8 T-cell measurements in HIV clinical studies show little relation to disease prognosis. There are two possible interpretations – either CD8 T ...