A large portion of the population is afflicted by the hypertensive and cardiovascular degenerative effects of AII. Because plasma levels of AII are often normal in the above disease states, abnormalities are likely to exist in receptor regulation and/or cell signaling, the mechanisms of which are complex and not fully understood. The applicant will use vascular smooth muscle cells in culture to i) define the C-terminal domain responsible for activation of phospholipase C; ii) investigate and identify the mechanisms of cross-talk by which the G-protein-coupled receptor activates MAPkinase via calcium calmodulin kinase; iii) identify receptor binding proteins responsible for receptor internalization and the mechanism of desensitization; and iv) down regulation of the AT1 mRNA by destabilization of the mRNA. The focus is on the dominant vasoconstrictor, mitogenic, hypertrophic receptor (AT1) and the regulatory function of the cytosolic C-terminal region. Techniques to be used include receptor antibodies, AT1 engineered mutant, the yeast two hybrid system, and specific new inhibitors and assay techniques. The approach using cellular and molecular tools will provide significant new information on complex receptor regulation and signaling and thus insights into potential defects in and therapy for various vascular diseases.

Agency
National Institute of Health (NIH)
Institute
National Heart, Lung, and Blood Institute (NHLBI)
Type
Research Project (R01)
Project #
3R01HL058205-03S1
Application #
6096533
Study Section
Special Emphasis Panel (ZRG4 (03))
Project Start
1997-04-10
Project End
2001-03-31
Budget Start
1999-08-01
Budget End
2000-03-31
Support Year
3
Fiscal Year
1999
Total Cost
Indirect Cost
Name
Vanderbilt University Medical Center
Department
Biochemistry
Type
Schools of Medicine
DUNS #
004413456
City
Nashville
State
TN
Country
United States
Zip Code
37212
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