Document Detail


Antagonistic functions of tetradecanoyl phorbol acetate-inducible-sequence 11b and HuR in the hormonal regulation of vascular endothelial growth factor messenger ribonucleic acid stability by adrenocorticotropin.
MedLine Citation:
PMID:  16306087     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
Expression of vascular endothelial growth factor (VEGF), an endothelial cell-specific mitogen and a potent angiogenic factor, is up-regulated by a variety of factors including hypoxia, growth factors, and hormones. In the adrenal cortex, regulation of VEGF expression by the pituitary hormone ACTH ensures the maintenance of the organ vasculature. We have previously shown that ACTH evokes a rapid and transient increase in VEGF mRNA levels in primary adrenocortical cells through transcription-independent mechanisms. We further demonstrated that the zinc finger RNA-binding protein Tis11b (tetradecanoyl phorbol acetate-inducible-sequence 11b) destabilizes VEGF mRNA through its 3'-untranslated region (3'-UTR) and that Tis11b is involved in the decay phase of ACTH-induced VEGF mRNA expression. In the present study, we attempted to determine the mechanisms underlying ACTH-elicited increase in VEGF mRNA levels in adrenocortical cells. We show that ACTH triggers an increase in the levels of the mRNA-stabilizing protein HuR in the cytoplasm and a concomitant decrease in the levels of HuR in the nucleus. This process is accompanied by an increased association of HuR with the nucleocytoplasmic shuttling protein pp32, indicating that ACTH induces HuR translocation from the nuclear to the cytoplasmic compartment. Leptomycin B, a specific inhibitor of CRM1-dependent nuclear export of pp32, significantly reduced ACTH-induced VEGF mRNA levels. Furthermore, RNA interference-mediated depletion of HuR in adrenocortical cells abrogated ACTH-induced VEGF mRNA expression. Finally, we show that Tis11b and HuR exert antagonistic effects on VEGF 3'-UTR in vitro. Although both proteins could bind simultaneously on VEGF 3'-UTR, Tis11b markedly decreases HuR-binding to this RNA sequence. Altogether, these results suggest that the RNA-stabilizing protein HuR is instrumental to ACTH-induced expression of VEGF mRNA and that the nuclear export of HuR is a rate-limiting step in this process. HuR appears to transiently stabilize VEGF transcripts after ACTH stimulation of adrenocortical cells, and Tis11b appears to subsequently trigger their degradation.
Authors:
Nadia Cherradi; Cyrille Lejczak; Agnes Desroches-Castan; Jean-Jacques Feige
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Publication Detail:
Type:  In Vitro; Journal Article; Research Support, Non-U.S. Gov't     Date:  2005-11-23
Journal Detail:
Title:  Molecular endocrinology (Baltimore, Md.)     Volume:  20     ISSN:  0888-8809     ISO Abbreviation:  Mol. Endocrinol.     Publication Date:  2006 Apr 
Date Detail:
Created Date:  2006-03-28     Completed Date:  2006-06-23     Revised Date:  2009-11-18    
Medline Journal Info:
Nlm Unique ID:  8801431     Medline TA:  Mol Endocrinol     Country:  United States    
Other Details:
Languages:  eng     Pagination:  916-30     Citation Subset:  IM    
Affiliation:
Institut National de la Santé et de la Recherche Médicale, Equipe Mixte 01-05, Department of Cellular Responses and Dynamics, Commissariat à l'Energie Atomique, F-38054 Grenoble, France.
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MeSH Terms
Descriptor/Qualifier:
3' Untranslated Regions
Active Transport, Cell Nucleus
Adrenal Cortex / cytology,  drug effects
Adrenocorticotropic Hormone / pharmacology
Animals
Antigens, Surface / genetics,  metabolism*
Base Sequence
Cattle
Cells, Cultured
DNA-Binding Proteins / genetics,  metabolism*
Fatty Acids, Unsaturated / pharmacology
Gene Expression Regulation / drug effects
RNA Interference
RNA Stability / drug effects
RNA, Messenger / genetics*,  metabolism*
RNA-Binding Proteins / genetics,  metabolism*
Retroviridae Proteins / metabolism
Tetradecanoylphorbol Acetate / pharmacology
Vascular Endothelial Growth Factor A / genetics*
Chemical
Reg. No./Substance:
0/3' Untranslated Regions; 0/Antigens, Surface; 0/DNA-Binding Proteins; 0/ELAV-like protein 1; 0/Fatty Acids, Unsaturated; 0/RNA, Messenger; 0/RNA-Binding Proteins; 0/Retroviridae Proteins; 0/Vascular Endothelial Growth Factor A; 0/avian retrovirus proteins; 16561-29-8/Tetradecanoylphorbol Acetate; 87081-35-4/leptomycin B; 9002-60-2/Adrenocorticotropic Hormone
Comments/Corrections

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