The present study demonstrates the minimal, optimal, and synergistic signals involved in the activation of normal human peripheral blood and tonsillar B cells to proliferation. Initial activation signals were delivered to B cells by low concentrations of anti-mu antibody which did not induce proliferation by themselves. However, marked synergy was seen when anti-mu antibody was added to culture...

Tissue cultures with two compartments, separated by a cell impermeable nuclepore membrane (1 micro pore size), were used to investigate the mechanism of T-B lymphocyte cooperation. It was found that collaboration was as effective when the T and B lymphocyte populations were separated by the membrane as when they were mixed together. Critical tests were performed to verify that the membranes use...

In HER2 (ErbB2)-overexpressing cells, transforming growth factor B (TGF-B), via activation of phosphoinositide-3 kinase (PI3K), recruits actin and actinin to HER2, which then colocalizes with Vav2, activated Rac1, and Pak1 at cell protrusions. This results in prolonged Rac1 activation, enhanced motility and invasiveness, Bad phosphorylation, uncoupling of Bad/Bcl-2, and enhanced cell survival. ...

The importance of murine monokines and lymphokines in T cell immune responses has been emphasized by the development o f T cell cloning technology (1) and the identification of cloned tumor lines that respond to or secrete these factors (2, 3). Such studies have shown that the monokine interleukin 1 (IL-1) 1 induces certain T cells to secrete interleukin 2 (IL-2), and that this lymphokine can m...

Each cell has receptors on the surface that specifically bind to solutes (ligands) produced during tissue damage or infection. This review aimed describe role of PRR in human body's defense system. The binding ligand its receptor results activation intracellular signaling pathways and activation. B T lymphocytes adaptive immune system have developed (that is, T-cell receptor, TCR, B-cell BCR) a...