Endothelial cell gene expression and behavior is highly regulated by fluid shear stress from flowing blood. Endothelial responses to flow regulate vascular embryogenesis, normal vascular physiology and development of atherosclerosis. Our previous work identified a mechanotransduction complex consisting of PECAM-1, VE-cadherin and VEGF receptor 2 that resides at cell-cell junctions and mediates conversion of force to biochemical signals in this system. PECAM-1 appears to be the true force transducer, VE-cadherin functions as an adapter that brings VEGFR2 into the complex and the VEGFR tyrosine kinase initiates key downstream signals. These signals include conversion of integrins to high affinity states, which leads to their binding to extracellular matrix. These newly bound integrins then generate signals. Consistent with this model, the extracellular matrix under the endothelial cells critically modulates the signals induced by flow. In particular, PAK (p21-activated kinase) mediates critical aspects of this matrix specificity. The current project aims to elucidate the molecular mechanism for transduction by the junctional mechanotransduction complex and to test the role of PAK in atherogenesis in vivo. To achieve these overall goals we will: 1) measure forces across PECAM-1 and elucidate the role of the PECAM-1 cytoplasmic domain in mechanotransduction. 2) identify the protein interactions that mediate adapter function by VE-cadherin. 3) examine vascular inflammation and atherogenesis in PAK-deficient mice.

Public Health Relevance

Atherosclerosis is a chronic inflammatory disease of arteries. Approximately half of all deaths in the United States are caused by heart attacks, strokes or other vascular events associated with atherosclerosis. While risk factors such as hyperlipidemia and diabetes are important risk factors, atherosclerosis is initiated and maintained at regions of arteries that are subject to disturbances in fluid flow. This project will investigate the molecular mechanisms of mechanotransduction in arteries that leads to atherosclerosis. Understand how fluid shear stress induces vascular inflammation is likely to identify new drug targets that may lead to more effective therapies to prevent or treat these diseases.

Agency
National Institute of Health (NIH)
Institute
National Heart, Lung, and Blood Institute (NHLBI)
Type
Research Project (R01)
Project #
5R01HL075092-10
Application #
8254438
Study Section
Vascular Cell and Molecular Biology Study Section (VCMB)
Program Officer
Kindzelski, Andrei L
Project Start
2003-12-29
Project End
2014-04-30
Budget Start
2013-05-01
Budget End
2014-04-30
Support Year
10
Fiscal Year
2013
Total Cost
$392,111
Indirect Cost
$156,491
Name
Yale University
Department
None
Type
Schools of Medicine
DUNS #
043207562
City
New Haven
State
CT
Country
United States
Zip Code
06520
Pawar, Archana; Meier, Jeremy A; Dasgupta, Anwesha et al. (2016) Ral-Arf6 crosstalk regulates Ral dependent exocyst trafficking and anchorage independent growth signalling. Cell Signal 28:1225-36
Papangeli, Irinna; Kim, Jongmin; Maier, Inna et al. (2016) MicroRNA 139-5p coordinates APLNR-CXCR4 crosstalk during vascular maturation. Nat Commun 7:11268
Baeyens, Nicolas; Bandyopadhyay, Chirosree; Coon, Brian G et al. (2016) Endothelial fluid shear stress sensing in vascular health and disease. J Clin Invest 126:821-8
Nickerson, M L; Witte, N; Im, K M et al. (2016) Molecular analysis of urothelial cancer cell lines for modeling tumor biology and drug response. Oncogene :
Brenner, Michael D; Zhou, Ruobo; Conway, Daniel E et al. (2016) Spider Silk Peptide Is a Compact, Linear Nanospring Ideal for Intracellular Tension Sensing. Nano Lett 16:2096-102
Dubrac, Alexandre; Genet, Gael; Ola, Roxana et al. (2016) Targeting NCK-Mediated Endothelial Cell Front-Rear Polarity Inhibits Neovascularization. Circulation 133:409-21
Balestrini, Jenna L; Gard, Ashley L; Gerhold, Kristin A et al. (2016) Comparative biology of decellularized lung matrix: Implications of species mismatch in regenerative medicine. Biomaterials 102:220-30
Yun, Sanguk; Budatha, Madhusudhan; Dahlman, James E et al. (2016) Interaction between integrin α5 and PDE4D regulates endothelial inflammatory signalling. Nat Cell Biol 18:1043-53
Baeyens, Nicolas; Schwartz, Martin A (2016) Biomechanics of vascular mechanosensation and remodeling. Mol Biol Cell 27:7-11
Conway, Daniel E; Schwartz, Martin A (2015) Mechanotransduction of shear stress occurs through changes in VE-cadherin and PECAM-1 tension: implications for cell migration. Cell Adh Migr 9:335-9

Showing the most recent 10 out of 66 publications