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Characterization of factor-independent variants derived from TF-1 hematopoietic progenitor cells: the role of the Raf/MAP kinase pathway in the anti-apoptotic effect of GM-CSF.

Abstract：

:Human hematopoietic progenitor cells (TF-1) undergo apoptosis upon deprivation of their dependent cytokine. In this report, we have isolated and characterized some spontaneously derived cytokine-independent variants from TF-1 cells. Analysis of several signaling molecules known to be activated by the GM-CSF pathway revealed that two non-autocrine variants were still responsive to GM-CSF stimulation. However, both variants, without ligand stimulation, already had some activated forms of Raf and MAP kinases. Given current knowledge, the activated Raf/MAP kinase pathway was likely to be responsible for the survival of both variants in the cytokine-free medium. However, the growth of hybrids between wild type and either variant was unexpectedly dependent on GM-CSF. Both variants like the wild type cells were still susceptible to apoptosis induced by other stimuli. These results suggest that either the activated Raf/MAP kinase pathway in both variants is not sufficient to repress the 'two-fold' death signals generated from the hybrids or that there is another mechanism that is responsible for the factor-independent growth of both variants.

journal_name

Oncogene

journal_title

Oncogene

authors

Chao JR,Chen CS,Wang TF,Tseng LH,Tsai JJ,Kuo ML,Yen JJ,Yang Yen HF

doi

10.1038/sj.onc.1200884

subject

Has Abstract

pub_date

1997-02-13 00:00:00

pages

721-8

issue

6

eissn

0950-9232

issn

1476-5594

journal_volume

14

pub_type

杂志文章

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