Journal
DNA AND CELL BIOLOGY
Volume 28, Issue 9, Pages 425-U15Publisher
MARY ANN LIEBERT, INC
DOI: 10.1089/dna.2009.0884
Keywords
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Funding
- United States Public Health Service [AA000626]
- National Institute of Alcohol Abuse and Alcoholism (NIH) [2 T32 AA07467]
- Hopkins Digestive Diseases Basic Research Development Center [2464388]
- NATIONAL INSTITUTE ON ALCOHOL ABUSE AND ALCOHOLISM [T32AA007467, R01AA000626] Funding Source: NIH RePORTER
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Hepatic fibrosis results from excessive deposition of type I collagen. The roles of Smads in mediating the effect of transforming growth factor-beta 1 (TGF beta 1) on activation of the alpha(1)(I) collagen promoter were determined. Smads bind in association with Sp1 to the CC(GG)-rich TGF beta 1 responsive element of the promoter that lacks the classical Smad recognition element, and enhance binding of Sp1. In transfection experiments, TGF beta 1 activated a proximal promoter, but not promoters mutated at sites that prevented Sp1 binding. Sp1 alone or the combination of Smad2 and Smad4 activated the promoter in transfected human LX-2 stellate cells. Sp1 or Smad2 knockdowns with siRNAs prevented the effect of TGF beta 1 in enhancing the promoter. In conclusion, this study shows that Smads bind in association with Sp1 to the CC(GG)-rich TGF beta 1 responsive element of the human alpha(1)(I) collagen promoter that lacks the classical Smad recognition element, thus enhancing the binding of Sp1 and in this manner activating the collagen promoter.
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