The role of the preBCR, the interleukin-7 receptor, and homotypic interactions during B-cell development.

Abstract:

:Considerable progress has been made in defining intermediate stages in the process leading from stem cells to mature B cells. Cell-bound and secreted molecules direct the progression through these stages and regulate the selection of clones from which the immune repertoire emerges. In fact, a myriad of signals derived from B-cell progenitors themselves and the microenvironment in which they develop direct the differentiation process. These signals are provided by B-cell antigen receptors (BCR) and their surrogates, and by adhesion and cytokine receptors. The co-operation of these receptors to control survival, expansion, and differentiation of early B-cell progenitors is the topic of this review. Specifically, we will summarize recent findings from our laboratory demonstrating that preBCR expression lowers the threshold for interleukin (IL)-7 responsiveness. How signals initiated by these receptors may intersect at this critical point of B-cell selection will be discussed. At the stage following IL-7 responsiveness we have shown that interactions between B-cell progenitors themselves promote their differentiation to immunoglobulin-secreting B cells. We propose that one function of stromal cells, known to be central to B lymphopoiesis, is to promote critical preB-preB homotypic interactions and ensuing signals.

journal_name

Immunol Rev

journal_title

Immunological reviews

authors

Stoddart A,Fleming HE,Paige CJ

keywords:

subject

Has Abstract

pub_date

2000-06-01 00:00:00

pages

47-58

eissn

0105-2896

issn

1600-065X

journal_volume

175

pub_type

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