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Distinct functions of erythropoietin and stem cell factor are linked to activation of mTOR kinase signaling pathway in human erythroid progenitors.

Abstract：

:Erythropoietin (EPO) and Stem Cell Factor (SCF) have partially distinct functions in erythroid cell development. The primary functions of EPO are to prevent apoptosis and promote differentiation, with a minor role as a mitogen. On the other hand SCF acts primarily as a mitogenic factor promoting erythroid cell proliferation with a minor role in inhibition of apoptosis. The concerted effects of these two growth factors are responsible for guiding initial commitment, expansion and differentiation of progenitors. The aim of the study was to identify signaling elements pertinent to translational control and elucidate whether both cytokines can contribute to protein translation providing some functional redundancy as seen with respect to apoptosis. The current study focused on non-apoptotic functions of SCF mediated through mTOR/p70S6 leading to protein translation and cell proliferation. We utilized a human primary erythroid progenitors and erythroblasts that are responsive to EPO and SCF to investigate the activation of mTOR/p70S6 kinases and their downstream effectors, the pathway primarily responsible for protein translation. We showed that mTOR, p70S6 kinases and their downstream signaling elements 4EBP1 and S6 ribosomal protein are all activated by SCF but not by EPO in primary erythroid progenitors. We also found that SCF is the sole contributor to activation of the protein translational machinery and activation of mTOR/p70S6 pathway is confined to the proliferative phase of erythroid differentiation program. Altogether these results demonstrate that unlike the survival function which is supported by both EPO and SCF protein translation essential for proliferation is governed by only SCF.

journal_name

Cytokine

journal_title

Cytokine

authors

Geslain R,Uddin S,Liu H,Jiang H,van Besien K,Pan T,Wickrema A

doi

10.1016/j.cyto.2012.10.017

subject

Has Abstract

pub_date

2013-01-01 00:00:00

pages

329-35

issue

1

eissn

1043-4666

issn

1096-0023

pii

S1043-4666(12)00750-8

journal_volume

61

pub_type

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