Growth factors(GF) control a range of physiological processes in multiple cell types. They should be ideal therapeutic compounds, and yet striking tissue culture and animal model effects become marginal in the clinic. Effective use of vascular GF is challenging principally because their complex structures make them unstable, and the biological parameters they affect are ubiquitous and tightly regulated. Some have explained the difficulty with achieving clinical effect on physicochemical properties. Indeed, it is almost exclusively controlled release that produces positive effects in animal and clinical trials. Initial thoughts were that controlled release circumvented rapid clearance, sustaining release and prolonging receptor-ligand interaction. However, GF with identical physicochemical parameters behave differentially when controlled release, with these differences being accentuated in disease states. Thus, pharmacokinetic clearance alone cannot explain why mode of delivery is so critical to GF biology. Three convergent, interrelated events control the biology of a GF once released to a target tissue and we will progressively examine these events in the normal and diseased tissue states. They include, tissue binding, transport, deposition and distribution of the GF, metabolism, clearance and degradation of the GF, and intercellular communication and signaling. In this revised grant we establish an iterative program which integrates all of these elements by making use of unique tools developed in our laboratory combining aspects of cellular and molecular biology, growth factor biochemistry, materials science, polymer chemistry and controlled-release technology in vitro and in vivo with mathematical modeling. We will specifically: 1 examine the impact of growth factor binding to target tissue under different disease states and after different modes of delivery; 2 define how cellular pharmacokinetics constrains cell-growth factor interactions, 3 characterize the impact on growth factor action of intercellular gap junction signaling; and 4 codify the biological regulatory response to growth factors using mathematical models. The results of these studies will add to our understanding of GF biology and possibly the means by which we develop therapies around these compounds.

Agency
National Institute of Health (NIH)
Institute
National Heart, Lung, and Blood Institute (NHLBI)
Type
Research Project (R01)
Project #
5R01HL067246-03
Application #
6856515
Study Section
Pharmacology A Study Section (PHRA)
Program Officer
Goldman, Stephen
Project Start
2003-03-15
Project End
2006-02-28
Budget Start
2005-03-01
Budget End
2006-02-28
Support Year
3
Fiscal Year
2005
Total Cost
$407,500
Indirect Cost
Name
Massachusetts Institute of Technology
Department
Other Health Professions
Type
Schools of Arts and Sciences
DUNS #
001425594
City
Cambridge
State
MA
Country
United States
Zip Code
02139
Schubert, Shai Y; Benarroch, Alejandro; Monter-Solans, Juan et al. (2011) Primary monocytes regulate endothelial cell survival through secretion of angiopoietin-1 and activation of endothelial Tie2. Arterioscler Thromb Vasc Biol 31:870-5
Baker, Aaron B; Groothuis, Adam; Jonas, Michael et al. (2009) Heparanase alters arterial structure, mechanics, and repair following endovascular stenting in mice. Circ Res 104:380-7
Schubert, Shai Y; Benarroch, Alejandro; Ostvang, Janne et al. (2008) Regulation of endothelial cell proliferation by primary monocytes. Arterioscler Thromb Vasc Biol 28:97-104
Tzafriri, A Rami; Edelman, Elazer R (2007) Endosomal receptor kinetics determine the stability of intracellular growth factor signalling complexes. Biochem J 402:537-49
Hwang, Chao-Wei; Levin, Andrew D; Jonas, Michael et al. (2005) Thrombosis modulates arterial drug distribution for drug-eluting stents. Circulation 111:1619-26
Tzafriri, A Rami; Edelman, Elazer R (2005) On the validity of the quasi-steady state approximation of bimolecular reactions in solution. J Theor Biol 233:343-50
Levin, Andrew D; Jonas, Michael; Hwang, Chao-Wei et al. (2005) Local and systemic drug competition in drug-eluting stent tissue deposition properties. J Control Release 109:236-43
Balcells, Mercedes; Fernandez Suarez, Marta; Vazquez, Maria et al. (2005) Cells in fluidic environments are sensitive to flow frequency. J Cell Physiol 204:329-35
Richter, Yoram; Groothuis, Adam; Seifert, Philip et al. (2004) Dynamic flow alterations dictate leukocyte adhesion and response to endovascular interventions. J Clin Invest 113:1607-14
Levin, Andrew D; Vukmirovic, Neda; Hwang, Chao-Wei et al. (2004) Specific binding to intracellular proteins determines arterial transport properties for rapamycin and paclitaxel. Proc Natl Acad Sci U S A 101:9463-7

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