The Ras superfamily of small GTPases play important signal transduction roles in T cell activation, anergy, apoptosis and effector function. In a post translational process called isoprenylation, small GTPases are modified with lipid moieties in order to allow these proteins to insert in the cell membrane where they become activated and activate their effector proteins. Isoprenylation inhibitors disrupt small-GTPase function by inhibiting the post-translational addition of farnesyl or geranylgeranyl groups. Because they inhibit small-GTPase functions, it is hypothesized that isoprenylation inhibitors have immunosuppressive and tolerogenic properties that may prevent allograft rejection and promote long term graft acceptance in a rat heart transplant model.
The specific aims of this project are. 1. To determine if isoprenylation inhibitors abrogate T cell activation and function in vitro. 2. To determine the effects of isoprenylation inhibitors on the T cell: APC immunologic synapse formation. 3. To determine if isoprenylation inhibitors abrogate Ras, Rac and/or Rho isoprenylation. 4. To determine if isoprenylation inhibitors promote activation induced apoptosis in T cells. 5. To determine the ability and efficacy of isoprenylation inhibitors to prevent acute allograft rejection and to promote tolerance in a rat heart transplant model.

Agency
National Institute of Health (NIH)
Institute
National Institute of Allergy and Infectious Diseases (NIAID)
Type
Postdoctoral Individual National Research Service Award (F32)
Project #
1F32AI051094-01
Application #
6445752
Study Section
Special Emphasis Panel (ZRG1-IMB (20))
Program Officer
Prograis, Lawrence J
Project Start
2002-05-01
Project End
Budget Start
2002-05-01
Budget End
2003-04-30
Support Year
1
Fiscal Year
2002
Total Cost
$44,212
Indirect Cost
Name
Stanford University
Department
Surgery
Type
Schools of Medicine
DUNS #
800771545
City
Stanford
State
CA
Country
United States
Zip Code
94305
Si, Ming-Sing; Reitz, Bruce A; Borie, Dominic C (2005) Inhibition of lymphocyte activation and function by the prenylation inhibitor L-778,123. Invest New Drugs 23:21-9
Si, Ming-Sing; Reitz, Bruce A; Borie, Dominic C (2005) Effects of the kinase inhibitor CGP41251 (PKC 412) on lymphocyte activation and TNF-alpha production. Int Immunopharmacol 5:1141-9