t lymphocytes that are involved in cellular mediated immunity include two types known as tcd8+ (cytotoxic t lymphocytes) and tcd4+ (helper t lymphocytes). tcd4+ has four main subtypes, including th1, th2, th17, and treg lymphocytes.th17 lymphocytes play a role in defense against microbes that th1 and th2 lymphocytes have not the ability to respond to them. the most important cytokines, which ar...

Typically, proliferation of mature small lymphocytes of normal morphology; lymphocytes with more abundant cytoplasm may be present. When prolymphocytes are 10% or greater they are classified as 'chronic lymphocytic leukaemia-prolymphocytic leukaemia'. The main immunophenotypic features that define BCLL are: the predominant population shares B-cell markers CD19, CD20, and CD23 with the CD5 antig...

Mononuclear cells isolated from paired blood and synovial fluid of seven patients with rheumatoid arthritis showed cytoadherence to porcine Peyer's patch high endothelial venules using the Stamper-Woodruff method. A significantly greater proportion of binding was found among the synovial fluid lymphocytes. These would appear to be a population of cells that share adherence characteristics with ...

In six normal subjects, no surface immunoglobulins were detected on blood lymphocytes containing bundle-shaped tubular (BST) inclusions, after incubation with anti-human IgM peroxidase-labeled Fab'2 fragments. These Fab'2 fragments from pepsin-digested sheep anti-human immunoglobulins revealed human mu kappa, and lambda chains. These results suggest that the BST inclusions do not belong to B ly...

Previous work has shown that the immediate precursor of B lymphocytes (PB cell) has many properties that distinguish it from both B lymphoctes and hemopoietic stem cells. Size, density, tissue distribution, and sensitivity to cytotoxic antisera differ for each type of cell. The work described here was designed to study three aspects of the differentiation of PB cells. First, since PB cells prob...

The humoral immune response of the mouse to certain antigens is characterized by the dominant expression of a single or limited number of related, immunoglobulin variable region (V) structures by antibody-secreting lymphocytes. Such dominance could be due to preferred expression of these V regions in the B cell population prior to the immune response or could result from the action of selective...

Interleukin-5 (IL-5) is the major soluble factor able to mediate hypereosinophilia. We report a case of hypereosinophilic syndrome in which the presence of a population of CD3-CD4+ cells able to overproduce IL-5 was shown. The lack of CD3 and TCRAB membrane expression on otherwise phenotypically normal mature T lymphocytes together with the absence of detectable TCRBV mRNA and clonal rearrangem...