Work by the investigator in the first funding period of this application led to the novel discovery that cyclosporine stimulates the expression of transforming growth factor beta (TGF-b), an immunosuppressive cytokine. In this competitive renewal application, the current paradigm for cyclosporine induced immunosuppression, the inhibition of interleukin-2 gene transcription in alloreactive T cells, is being challenged by the hypothesis that cyclosporine induced TGF-b hyperexpression is pivotal in the immunosuppressive effect of this drug. The hypothesis will be tested in a murine islet transplant model comparing wild-type and IL-2 deficient recipients and by blocking TGF-b activity with antisense oligodeoxynucleotides (ODN) and anti-TGF-b monoclonal antibodies. A parallel murine renal cancer metastasis model will be utilized to assess the effect of cyclosporine induced TGF-b hyperexpression on tumor progression both in wild-type and nude mice, allowing assessment of TGF-b- dependent inhibition of NK activity, which cannot be studied in the transplant model. Finally, the effect of cyclosporine-induced TGF-b hyperexpression will be examined in vitro on CTL and NK cell cytolytic activity, as well as on the expression of cytotoxic attack molecules and immunoregulatory cytokines.

Agency
National Institute of Health (NIH)
Institute
National Institute of Allergy and Infectious Diseases (NIAID)
Type
Research Project (R01)
Project #
2R01AI026932-06
Application #
2761603
Study Section
Surgery, Anesthesiology and Trauma Study Section (SAT)
Program Officer
Kehn, Patricia J
Project Start
1991-04-01
Project End
2002-11-30
Budget Start
1998-12-01
Budget End
1999-11-30
Support Year
6
Fiscal Year
1999
Total Cost
Indirect Cost
Name
Weill Medical College of Cornell University
Department
Internal Medicine/Medicine
Type
Schools of Medicine
DUNS #
201373169
City
New York
State
NY
Country
United States
Zip Code
10065
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Khanna, A; Kapur, S; Sharma, V et al. (1997) In vivo hyperexpression of transforming growth factor-beta1 in mice: stimulation by cyclosporine. Transplantation 63:1037-9
Shin, G T; Khanna, A; Sharma, V K et al. (1997) In vivo hyperexpression of transforming growth factor-beta 1 in humans: stimulation by cyclosporine. Transplant Proc 29:284
Andjelic, S; Khanna, A; Suthanthiran, M et al. (1997) Intracellular Ca2+ elevation and cyclosporin A synergistically induce TGF-beta 1-mediated apoptosis in lymphocytes. J Immunol 158:2527-34

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