The Cbl-b RING finger domain has a limited role in regulating inflammatory cytokine production by IgE-activated mast cells.

Abstract:

:The RING finger type E3 ubiquitin ligase, Cbl-b, is abundantly expressed in bone marrow-derived mast cells (BMMCs) and functions as a potent negative regulator of signalling responses from the high-affinity IgE receptor (FcvarepsilonRI). To determine the contribution of Cbl-b E3 ligase activity we generated knockin mice with a loss-of-function mutation in the RING finger domain. We find the mice to be healthy and, unlike equivalent c-Cbl RING finger mutant mice, produce homozygous offspring at the expected frequency. Comparative analyses of BMMCs from Cbl-b knockout and Cbl-b RING finger mutant mice revealed that both showed similarly enhanced FcvarepsilonRI signalling compared to wild-type cells for most parameters examined. A notable exception was a markedly higher level of activation of IkappaB kinase (IKK) in Cbl-b knockout BMMC compared to RING finger mutant-derived cells. In addition BMMCs from the Cbl-b RING finger mutant did not retard FcvarepsilonRI internalization to the extent observed for knockout cells. Most striking however was the finding that RING finger mutant mast cells do not produce the very high levels of TNF-alpha, IL-6, and MCP-1 evident in Cbl-b knockout cultures following FcvarepsilonRI activation. Thus the ability of Cbl-b to function as a negative regulator of FcvarepsilonRI signalling that promotes inflammatory cytokine production is largely independent of the RING finger domain.

journal_name

Mol Immunol

journal_title

Molecular immunology

authors

Oksvold MP,Dagger SA,Thien CB,Langdon WY

doi

10.1016/j.molimm.2007.08.002

subject

Has Abstract

pub_date

2008-02-01 00:00:00

pages

925-36

issue

4

eissn

0161-5890

issn

1872-9142

pii

S0161-5890(07)00679-7

journal_volume

45

pub_type

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