Dissection of the cytoplasmic domains of cytokine receptors involved in STAT and Ras dependent proliferation.

Abstract:

:Cytokine receptors have different signaling requirements which ultimately lead to various physiological responses. In an effort to precisely characterize the molecular determinants involved in the proliferative response mediated by cytokines, we examine dose-dependent proliferation of the betac (GM-CSF, IL-3, IL-5) and homodimeric (G-CSF, TPO) cytokine receptors. Here we report that all cytokine receptors tested activate mostly STAT3 and STAT5. While STAT3 had a positive effect on betac cytokine receptor dependent proliferation, STAT5 was strongly inhibitory. Similarly, G-CSF and TPO lead to activation of STAT3 and STAT5 but, unlike the betac cytokine receptors, both stimulated cellular growth. On the other hand, Ras activation was necessary for all receptor mediated proliferation with the exception of G-CSF R. Truncated mutants of the receptors intracellular domains were used to delineate the functional domains involved in JAK/STAT and Ras activation linked to cellular growth. For instance, we revealed a critical role for the specific alpha subunit of the betac receptors in triggering receptor activation, STAT3 stimulation and proliferation, while Ras activation originates from the distal intracellular portion of the betac subunit. Finally, we showed that proximal STAT activation is the triggering event of G-CSF and TPO receptor function.

journal_name

Oncogene

journal_title

Oncogene

authors

Piu F,Magnani M,Ader ME

doi

10.1038/sj.onc.1205444

subject

Has Abstract

pub_date

2002-05-16 00:00:00

pages

3579-91

issue

22

eissn

0950-9232

issn

1476-5594

journal_volume

21

pub_type

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