Document Detail

Differential regulation of the rat heme oxygenase-1 expression by Ets oncoproteins in glomerular mesangial cells.
MedLine Citation:
PMID:  16310515     Owner:  NLM     Status:  MEDLINE    
The Ets-1 oncoprotein and the heme-catabolizing enzyme heme oxygenase (HO)-1 have been implicated in the pathogenesis of renal disease. We investigated the role of the putative Ets-binding sites (EBSs) in the transactivation of the proximal promoter of rat heme oxygenase 1 (hmox1) gene by the Ets oncoproteins Fli-1, Erg-2, and Ets-1 in mesangial cells. We examined several rat hmox1-chloramphenicol acetytransferase (CAT) constructs and EBS mutant constructs in an effort to assess the effect of ETS oncoproteins on transactivation of the rat hmox1 proximal promoter in renal glomerular mesangial cells. CAT assays demonstrated that the proximal promoter region (-1387 to -40) contains positive and negative regulatory regions and that the EBS-2, 3, and 4 play a role in basal promoter activity. Overexpression of Fli-1 and Erg-2 proteins showed a significant increase in promoter activity, whereas Ets-1 showed no effect on promoter activity. The Fli-1-induced transcriptional activation was not altered by mutation of EBSs, either independently or in combination. However, mutation of EBS-4 independently or a combined mutation of sites 3 and 4 led to a 50% reduction in Erg-2-induced transcriptional activation. Furthermore, mutation of EBS-2 and 4 completely abolished Erg-2-mediated promoter activation. Our results support a role for Ets transcription factors in the regulation of rat hmox-1 gene expression in mesangial cells.
Prasad D K Dhulipala; Prasun K Datta; E Shyam Reddy; Elias A Lianos
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  The Journal of laboratory and clinical medicine     Volume:  146     ISSN:  0022-2143     ISO Abbreviation:  J. Lab. Clin. Med.     Publication Date:  2005 Dec 
Date Detail:
Created Date:  2005-11-28     Completed Date:  2006-01-03     Revised Date:  2008-11-21    
Medline Journal Info:
Nlm Unique ID:  0375375     Medline TA:  J Lab Clin Med     Country:  United States    
Other Details:
Languages:  eng     Pagination:  326-32     Citation Subset:  AIM; IM    
Department of Medicine, Robert Wood Johnson Medical School, University of Medicine and Dentistry of New Jersey, New Brunswick, NJ 08903-0019, USA.
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MeSH Terms
Cells, Cultured
Ether-A-Go-Go Potassium Channels / genetics,  metabolism
Gene Expression Regulation, Enzymologic*
Glomerular Mesangium / cytology,  enzymology*
Heme Oxygenase (Decyclizing) / genetics*,  metabolism
Point Mutation
Proto-Oncogene Protein c-ets-1 / genetics*,  metabolism
Proto-Oncogene Protein c-fli-1 / genetics,  metabolism
Transcriptional Activation
Reg. No./Substance:
0/Erg2 protein, rat; 0/Ether-A-Go-Go Potassium Channels; 0/Proto-Oncogene Protein c-ets-1; 0/Proto-Oncogene Protein c-fli-1; EC Oxygenase (Decyclizing); EC protein, rat

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