IRES-dependent regulation of FGF-2 mRNA translation in pathophysiological conditions in the mouse.

Abstract:

:The mRNA coding for FGF-2 (fibroblast growth factor 2), a major angiogenic factor, is translated by an IRES (internal ribosome entry site)-dependent mechanism. We have studied the role of the IRES in the regulation of FGF-2 expression in vivo, under pathophysiological conditions, by creating transgenic mice lines expressing bioluminescent bicistronic transgenes. Analysis of FGF-2 IRES activity indicates strong tissue specificity in adult brain and testis, suggesting a role of the IRES in the activation of FGF-2 expression in testis maturation and brain function. We have explored translational control of FGF-2 mRNA under diabetic hyperglycaemic conditions, as FGF-2 is implied in diabetes-related vascular complications. FGF-2 IRES is specifically activated in the aorta wall in streptozotocin-induced diabetic mice, in correlation with increased expression of endogenous FGF-2. Thus, under hyperglycaemic conditions, where cap-dependent translation is blocked, IRES activation participates in FGF-2 overexpression, which is one of the keys of diabetes-linked atherosclerosis aggravation. IRES activation under such pathophysiological conditions may involve ITAFs (IRES trans-acting factors), such as p53 or hnRNP AI (heterogeneous nuclear ribonucleoprotein AI), recently identified as inhibitory or activatory ITAFs respectively for FGF-2 IRES.

journal_name

Biochem Soc Trans

authors

Gonzalez-Herrera IG,Prado-Lourenco L,Teshima-Kondo S,Kondo K,Cabon F,Arnal JF,Bayard F,Prats AC

doi

10.1042/BST20060017

keywords:

subject

Has Abstract

pub_date

2006-02-01 00:00:00

pages

17-21

issue

Pt 1

eissn

0300-5127

issn

1470-8752

pii

BST20060017

journal_volume

34

pub_type

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