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Decrease in cAMP levels promoted by CD48-CD2 interaction correlates with inhibition of apoptosis in B cells.

Abstract：

:The authors recently reported that CD2 ligation rescues B cells from antigen-induced apoptosis by upregulation of intracellular Bcl-2 levels. However, the characterization of the early signals involved in apoptosis rescue by CD2 ligation has not been well established. In this context, CD2 does not promote either phosphatidylinositol turnover or CA2+ mobilization in B cells. In this paper the authors show that CD2 interaction with its ligand CD48 also reduces the apoptosis induced by forskolin and the phosphodiesterase inhibitor 3-isobutyl-1-methylxanthine and, to a much lesser extent, the apoptosis induced by cholera toxin in murine B splenocytes. Using a cAMP detection system sensitive to the picomolar range, the authors demonstrate that CD2-CD48 interaction decreases the intracellular cAMP concentrations induced by forskolin but not by cholera toxin. In comparison with the CD2-CD48 interaction, CD40-CD40 ligand interaction completely inhibits the apoptosis induced by cAMP increases without affecting the intracellular cAMP levels promoted by forskolin or cholera toxin. These results indicate that CD2 can also control the apoptosis at the very early steps after receptor signalling, such as the adenylate cyclase activity. Given that heterotrimeric G-proteins can mediate the adenylate cyclase activity the authors suggest that CD2 signalling could act through these small proteins, which would explain the inability of CD2 signalling to rescue from the apoptosis induced by cholera toxin, a Gs-protein activator. Conversely, CD40 seems to control apoptosis further downstream of the cAMP-PKA pathway where the survival and apoptotic signals are confluent, which might therefore render it a more efficient system to block apoptosis.

journal_name

Scand J Immunol

journal_title

Scandinavian journal of immunology

authors

Baixeras E,Garcia-Lozano E,Martinez-A C

doi

10.1046/j.1365-3083.1996.d01-63.x

subject

Has Abstract

pub_date

1996-04-01 00:00:00

pages

406-12

issue

4

eissn

0300-9475

issn

1365-3083

journal_volume

43

pub_type

杂志文章

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