Conserved Region of the Cytoplasmic Domain is not Essential for Erythropoietin-Dependent Growth
作者:
HiltonCraig J.,
BerridgeMichael V.,
期刊:
Growth Factors
(Taylor Available online 1995)
卷期:
Volume 12,
issue 4
页码: 263-276
ISSN:0897-7194
年代: 1995
DOI:10.3109/08977199509028965
出版商: Taylor&Francis
关键词: box 2;IL-2 Eps receptor;cytokine receptor superfamily
数据来源: Taylor
摘要:
AbstractRecent studies have suggested that the membrane proximal region of the cytoplasmic domain of the erythropoietin receptor and other members of the cytokine receptor superfamily may be required for signal transduction. Expression of several deletion mutants of the erythropoietin receptor in Ba/F3 cells showed that a region with homology to the interleukin-2 receptorβ-chain which includes Box 2 is not essential for erythropoietin-dependent cell proliferation. However, a region between Box 1 and Box 2 contains essential residues for proliferative response. Expression of mutant receptors was confirmed by reverse transcriptase-PCR analysis and by Western blotting, which also showed no evidence for expression of endogenous wild-type receptor. These findings are in direct conflict with previously reported mutagenesis studies of the erythropoietin receptor suggesting that mitogenesis may be channelled through more than one pathway depending on the complement of signaling molecules expressed in the cell.
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