Our current understanding of the processes which regulate cellular mitogenesis is derived largely from the study of receptor tyrosine kinases, transforming viral oncogenes, and their normal cellular homologues. Recently, receptors which couple to heterotrimeric G proteins have also been shown to mediate signals which regulate cellular growth and differentiation. Growing evidence suggests that these receptors, which mediate potent mitogenic responses to a variety of humoral, endothelium- or platelet-derived substances, participate in the regulation of cellular proliferation in both physiologic and pathophysiologic states and in cellular transformation in some, mostly neuroendocrine, tumors. Perhaps surprisingly, many of these G protein-coupled receptor-derived signals are dependent upon the regulation of tyrosine protein kinases, and are thus indicative of complex crosstalk between G protein-coupled receptor and receptor tyrosine kinase signaling cascades. To date, four distinct classes of tyrosine protein kinase; src kinases, focal adhesion kinases (FAK), receptor tyrosine kinases, and Janus kinases, have been implicated in various aspects of G protein-coupled receptor signaling. The molecular mechanisms whereby these kinases are regulated, and their roles in transduction of G protein-coupled receptor-mediated mitogenic signals, is largely unknown. This project tests the hypothesis that G protein-coupled receptors mediate signals which regulate gene expression, and control cytoskeletal rearrangement, via the activation and targeting of tyrosine kinases to specific multi-protein signaling complexes. Employing Gs-, Gi, and Gq/11-coupling receptors in cultured cell model systems as well as primary cultures of cardiac and vascular smooth muscle, the first specific aim of the project is to determine the proximal mechanisms whereby G protein-coupled receptors regulate the activity of src, FAK and receptor tyrosine kinases. A parallel aim is to determine the role of activated c-src/receptor tyrosine kinase, and c-src/FAK complexes in the regulation of mitogen-activated protein kinase cascades. Another aim is to determine the role of these kinase complexes in mediating G protein-coupled receptor-dependent reorganization of the actin cytoskeleton. Understanding the mechanisms whereby G protein-coupled receptors regulate these components of the mitogenic signal may facilitate the identification of targets for the prevention of the proliferative complications of conditions such as diabetes mellitus, atherosclerosis and post-angioplasty restenosis.

Agency
National Institute of Health (NIH)
Institute
National Institute of Diabetes and Digestive and Kidney Diseases (NIDDK)
Type
Research Project (R01)
Project #
5R01DK055524-03
Application #
6177429
Study Section
Pharmacology A Study Section (PHRA)
Program Officer
Margolis, Ronald N
Project Start
1998-09-25
Project End
2003-08-31
Budget Start
2000-09-01
Budget End
2001-08-31
Support Year
3
Fiscal Year
2000
Total Cost
$154,000
Indirect Cost
Name
Duke University
Department
Internal Medicine/Medicine
Type
Schools of Medicine
DUNS #
071723621
City
Durham
State
NC
Country
United States
Zip Code
27705
Luttrell, Louis M; Maudsley, Stuart; Gesty-Palmer, Diane (2018) Translating in vitro ligand bias into in vivo efficacy. Cell Signal 41:46-55
Lee, Mi-Hye; Appleton, Kathryn M; El-Shewy, Hesham M et al. (2017) S1P in HDL promotes interaction between SR-BI and S1PR1 and activates S1PR1-mediated biological functions: calcium flux and S1PR1 internalization. J Lipid Res 58:325-338
Peterson, Yuri K; Luttrell, Louis M (2017) The Diverse Roles of Arrestin Scaffolds in G Protein-Coupled Receptor Signaling. Pharmacol Rev 69:256-297
Morinelli, Thomas A; Luttrell, Louis M; Strungs, Erik G et al. (2016) Angiotensin II receptors and peritoneal dialysis-induced peritoneal fibrosis. Int J Biochem Cell Biol 77:240-50
Williams, Grace R; Bethard, Jennifer R; Berkaw, Mary N et al. (2016) Exploring G protein-coupled receptor signaling networks using SILAC-based phosphoproteomics. Methods 92:36-50
Maudsley, Stuart; Martin, Bronwen; Janssens, Jonathan et al. (2016) Informatic deconvolution of biased GPCR signaling mechanisms from in vivo pharmacological experimentation. Methods 92:51-63
Luttrell, Louis M (2016) GPCR Signaling Rides a Wave of Conformational Changes. Cell 167:602-603
Lee, Mi-Hye; Appleton, Kathryn M; Strungs, Erik G et al. (2016) The conformational signature of ?-arrestin2 predicts its trafficking and signalling functions. Nature 531:665-8
Wilson, Parker C; Fitzgibbon, Wayne R; Garrett, Sara M et al. (2015) Inhibition of Sphingosine Kinase 1 Ameliorates Angiotensin II-Induced Hypertension and Inhibits Transmembrane Calcium Entry via Store-Operated Calcium Channel. Mol Endocrinol 29:896-908
Maudsley, Stuart; Martin, Bronwen; Gesty-Palmer, Diane et al. (2015) Delineation of a conserved arrestin-biased signaling repertoire in vivo. Mol Pharmacol 87:706-17

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