Involvement of the Sp3 transcription factor in induction of p21Cip1/WAF1 in keratinocyte differentiation.

Details

Serval ID
serval:BIB_0CD475F33371
Type
Article: article from journal or magazin.
Collection
Publications
Title
Involvement of the Sp3 transcription factor in induction of p21Cip1/WAF1 in keratinocyte differentiation.
Journal
Journal of Biological Chemistry
Author(s)
Prowse D.M., Bolgan L., Molnár A., Dotto G.P.
ISSN
0021-9258 (Print)
ISSN-L
0021-9258
Publication state
Published
Issued date
1997
Volume
272
Number
2
Pages
1308-1314
Language
english
Abstract
The cyclin-dependent kinase inhibitor p21 is induced in several in vitro terminal differentiation systems as well as in differentiating tissues in vivo. To determine the mechanism responsible for p21 induction during differentiation of mouse primary keratinocytes, we performed a deletion analysis of the p21 promoter. The minimal region of the p21 promoter required for its induction in keratinocyte differentiation consists of a contiguous stretch of 78 base pairs, which contains a GC-rich region as well as the TATA box. We determined that transcription factors Sp1 and Sp3, present in primary keratinocyte nuclear extracts, bind the GC region concomitantly. Expression studies established that both Sp1 and Sp3 activate the p21 promoter, but showed that only Sp3 overexpression enhances promoter inducibility during differentiation. Furthermore, disruption of the GC-rich region dramatically decreases transcription factor binding as well as promoter activity and inducibility upon differentiation. The overexpression of either Sp1 or Sp3 restores the basal activity of the disrupted promoter, but only Sp3 can restore its inducibility. These findings show that both Sp1 and Sp3 can contribute to the basal activity of the p21 promoter, and establish Sp3 as a specific transcription factor involved in the induction of p21 promoter during keratinocyte differentiation.
Keywords
Animals, Calcium/metabolism, Cell Differentiation, Chromosome Mapping, Cyclin-Dependent Kinase Inhibitor p21, Cyclins/genetics, Cyclins/metabolism, DNA-Binding Proteins/metabolism, Electrophoresis, Polyacrylamide Gel, Enzyme Inhibitors/metabolism, Keratinocytes/cytology, Mice, Nuclear Proteins/metabolism, Promoter Regions, Genetic, Sp3 Transcription Factor, Transcription Factors/metabolism, Zinc Fingers
Pubmed
Web of science
Create date
24/01/2008 15:59
Last modification date
20/08/2019 13:34
Usage data