Role of BLNK in oxidative stress signaling in B cells.

Abstract:

:BLNK (B cell linker protein) represents a central linker protein that bridges the B cell receptor-associated kinases with a multitude of signaling pathways. In this study, we have investigated the role of BLNK in oxidative stress signaling in B cells. H2O2 treatment of B cells induced a rapid tyrosine phosphorylation of BLNK in a H2O2 dose-dependent manner, which was inhibited in Syk-deficient DT40 cells. Calcium mobilization in BLNK-deficient as well as Syk-deficient and phospholipase C (PLC)-gamma2-deficient cells after H2O2 treatment was completely abolished. These were derived from decreased inositol 1,4,5-trisphosphate generation through PLC-gamma2 in BLNK-deficient cells. Moreover, viability of BLNK-deficient as well as PLC-gamma2-deficient cells after exposure to low doses of H2O2 was dramatically enhanced compared with that of the wild-type cells. Furthermore, c-Jun N-terminal kinase activation following high doses of H2O2 stimulation, but not low doses of H2O2 stimulation, was abrogated in BLNK-deficient as well as Syk-deficient cells. These findings have led to the suggestion that BLNK is required for coupling Syk to PLC-gamma2, thereby accelerating cell apoptosis in B cells exposed to low doses of H2O2.

journal_name

Antioxid Redox Signal

authors

Han W,Takano T,He J,Ding J,Gao S,Noda C,Yanagi S,Yamamura H

doi

10.1089/152308601317203576

keywords:

subject

Has Abstract

pub_date

2001-12-01 00:00:00

pages

1065-73

issue

6

eissn

1523-0864

issn

1557-7716

journal_volume

3

pub_type

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