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The Journal of Immunology, Vol 146, Issue 5 1446-1454, Copyright © 1991 by American Association of Immunologists
ARTICLES |
AJ Yellen, W Glenn, VP Sukhatme, XM Cao and JG Monroe
Department of Pathology and Laboratory Medicine, University of Pennsylvania School of Medicine, Philadelphia 19104.
During the course of B lymphocyte development, newly emerging surface Ig+ B cells pass through a stage when Ag-Ag receptor interactions lead not to immune responsiveness but to a state of functional tolerance. We have explored the molecular basis of antigenic nonresponsiveness and tolerance susceptibility using tolerance-susceptible surface Ig+ splenic B lymphocytes from neonatal mice and anti-mu chain antibodies as a polyclonal ligand. In this population of cells, surface IgM is uncoupled from the inositol phospholipid (PI)-hydrolysis pathway at a point proximal to the receptor; anti-mu antibodies did not stimulate inositol phosphate generation despite the fact that PI-hydrolysis was observed after treatment with A1F4, implicating the existence of a functional G protein and phospholipase C. Further evidence for a difference early in the signal transduction pathway stems from the finding that anti-mu stimulation does not induce the expression of two immediate/early PKC-linked genes egr-1 and c-fos. This appears to be the primary signaling difference between the mature and immature B cells from the neonatal mouse splenic population, as these cells undergo a G0-G1 cell cycle phase transition when surface IgM is bypassed using phorbol diester and calcium ionophore. Interestingly, despite undetectable levels of PI-hydrolysis, we observed equivalent receptor-mediated changes in intracellular calcium when comparing the immature and mature populations. These results indicate incomplete coupling of surface IgM to the signal transduction machinery operative in mature, immunocompetent B cells and suggests a molecular mechanism accounting for the differential processing of surface IgM signals into activation vs tolerogenic responses observed in these two stages of B cell development.
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