Antigen receptor-initiated growth inhibition is blocked in CD45-loss variants of a mature B lymphoma, with limited effects on apoptosis.

Abstract:

:Role of CD45 in B cell antigen receptor (BcR)-mediated signaling events in mature B cells was examined using BAL-17 and its CD45-negative clones. In the CD45-negative clones, BcR stimulation induced tyrosine phosphorylation almost identical to the parental cells, with a few exceptions of reduced phosphorylation, especially of a protein of about 60 kDa. BcR-induced calcium responses were reduced in the CD45-negative clones, but the kinetics were similar to the parent. BcR stimulation led to growth inhibition in the parental cells, but signals for growth inhibition were completely blocked in the CD45-negative clones. Interestingly, the same stimulation induced low, but significant levels of apoptosis both in the parent and in the CD45-negative clones. Thus, in mature BAL-17 cells, CD45 subtly mediate early signaling events (tyrosine phosphorylation and Ca2+ mobilization), and is absolutely required for the signaling pathway leading to growth regulation, but has limited effects on apoptosis.

journal_name

Eur J Immunol

authors

Ogimoto M,Katagiri T,Mashima K,Hasegawa K,Mizuno K,Yakura H

doi

10.1002/eji.1830250823

subject

Has Abstract

pub_date

1995-08-01 00:00:00

pages

2265-71

issue

8

eissn

0014-2980

issn

1521-4141

journal_volume

25

pub_type

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