Autocrine function of erythropoietin in IGF-1-induced erythropoietin biosynthesis.

Abstract:

:Insulin-like growth factor-1 (IGF-1) and erythropoietin (EPO) are induced in brain cells after brain ischemia and show synergistic neuroprotective effects. In LN215 astrocytoma cells, IGF-1 induced the activation of hypoxia-inducible factor-1, leading to increases in EPO mRNA levels and the secretion of EPO. Interestingly, blocking the potential action of secreted EPO on LN215 cells with EPO antibody, EPO receptor antibody, and soluble EPO receptor significantly suppressed the effect of IGF-1 on the biosynthesis of EPO. Synergistic action between IGF-1 and recombinant human EPO in the astrocytic production of EPO was observed. These data suggest that the IGF-1-EPO production/secretion process initiates a positive feedback loop of EPO biosynthesis in astrocytes, providing a molecular link between the two neuroprotective cytokines.

journal_name

Neuroreport

journal_title

Neuroreport

authors

Kim I,Kim CH,Yim YS,Ahn YS

doi

10.1097/WNR.0b013e32831743fb

subject

Has Abstract

pub_date

2008-11-19 00:00:00

pages

1699-703

issue

17

eissn

0959-4965

issn

1473-558X

journal_volume

19

pub_type

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