Research over the past 3-4 years has established the ligand-activated transcription factor, peroxisome proliferator receptor (PPAR) gamma, as a dominant component of the adipogenic process. Toward the goal of understanding the molecular mechanisms involved in regulating expression of the PPARgamma gene during adipogenesis, the specific aims of the proposed research are: (1) To identify and characterize specific regulatory regions (cis-acting elements) within the promoter of the PPARgamma gene and (3) To determine how both adipogenic (dexamethasone) and anti-adipogenic (retinoic acid) stimuli modulate expression of the PPARgamma gene. The hypothesis to be tested is that during adipogenic (retinoic acid) stimuli modulate expression of the PPARgamma gene. The hypothesis to be tested is that during adipogenesis, transacting factors, which in response to adipogenic stimuli, bind to or dissociate from cis-acting elements within the promoter of the PPAR gamma gene ultimately resulting in transcriptional initiation. Cis-acting elements will be identified using ex vivo transfected reporter and DNaseI footprinting assays. Trans-acting factors will be identified using ex vivo transfected reporter and DNaseI footprinting assays. Trans-acting factors will be identified by analyzing sequence specific elements and/or protein purification using identified cis-acting element sequences. Finally, the influence of both adipogenic and anti-adipogenic stimuli on cis-acting elements will be examined using a pre-adipocyte implantation technique. Completion of the proposed research will contribute toward understanding the process of adipogenesis and may serve as a starting point for manipulation of the adipogenic process in the treatment of obesity and obesity-associated illnesses.

Agency
National Institute of Health (NIH)
Institute
National Institute of Diabetes and Digestive and Kidney Diseases (NIDDK)
Type
Postdoctoral Individual National Research Service Award (F32)
Project #
5F32DK009894-03
Application #
6350640
Study Section
Special Emphasis Panel (ZRG2-REB (01))
Program Officer
Hyde, James F
Project Start
2001-02-01
Project End
Budget Start
2001-02-01
Budget End
2002-01-31
Support Year
3
Fiscal Year
2001
Total Cost
$40,196
Indirect Cost
Name
Johns Hopkins University
Department
Biochemistry
Type
Schools of Medicine
DUNS #
045911138
City
Baltimore
State
MD
Country
United States
Zip Code
21218
Dowell, Paul; Lane, M Daniel (2005) C/EBPalpha reverses the anti-adipogenic effects of the HIV protease inhibitor nelfinavir. Biochem Biophys Res Commun 327:571-4
Dowell, Paul; Otto, Tamara C; Adi, Saleh et al. (2003) Convergence of peroxisome proliferator-activated receptor gamma and Foxo1 signaling pathways. J Biol Chem 278:45485-91
Dowell, Paul; Cooke, David W (2002) Olf-1/early B cell factor is a regulator of glut4 gene expression in 3T3-L1 adipocytes. J Biol Chem 277:1712-8
Dowell, P; Flexner, C; Kwiterovich, P O et al. (2000) Suppression of preadipocyte differentiation and promotion of adipocyte death by HIV protease inhibitors. J Biol Chem 275:41325-32