A number of different mechanisms exist to effect allograft rejection. The role of the lymphocyte is central in graft rejection; ample evidence exists that the helper T cell and the cytolytic T cell can effect graft loss. It is also clear that events occurring locally at the graft site are distinct from the systemic response to the allograft. The sponge matrix allograft model provides ready access to cells which accumulate at the site of allograft rejection. In combination with limiting dilution analysis which can identify small numbers of sensitized cells, we can readily assess events associated with local and systemic allograft immunity. Using these functional assessments of lymphocytes rather than radiolabel eliminates the need to introduce radiolabelled cells into the intravascular space. We plan to use these techniques to define these local and systemic events according to the tissue transplanted. Once these events are defined for various tissue we plan to use either local or systemic immunosuppression to modify them. The long term goal is to employ local immunosuppression to render the animal's systemic immune apparatus intact.

Agency
National Institute of Health (NIH)
Institute
National Institute of Allergy and Infectious Diseases (NIAID)
Type
Research Project (R01)
Project #
5R01AI028284-05
Application #
3142692
Study Section
Surgery, Anesthesiology and Trauma Study Section (SAT)
Project Start
1988-09-30
Project End
1993-09-29
Budget Start
1992-09-01
Budget End
1993-09-29
Support Year
5
Fiscal Year
1992
Total Cost
Indirect Cost
Name
University of California San Francisco
Department
Type
Schools of Medicine
DUNS #
073133571
City
San Francisco
State
CA
Country
United States
Zip Code
94143
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Osorio, R W; Ascher, N L; Melzer, J S et al. (1994) beta-2 Microglobulin gene disruption prolongs murine islet allograft survival in NOD mice. Transplant Proc 26:752
Osorio, R W; Ascher, N L; Melzer, J S et al. (1994) Enhancement of islet allograft survival in mice treated with MHC class I specific F(ab')2 alloantibody. Transplant Proc 26:749
Osorio, R W; Ascher, N L; Stock, P G (1994) Prolongation of in vivo mouse islet allograft survival by modulation of MHC class I antigen. Transplantation 57:783-8
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Osorio, R W; Ascher, N L; Jaenisch, R et al. (1993) Isolation of functional MHC class I-deficient islet cells. Transplant Proc 25:968-9
Osorio, R W; Ascher, N L; Jaenisch, R et al. (1993) Major histocompatibility complex class I deficiency prolongs islet allograft survival. Diabetes 42:1520-7
Martinez, O M; Ascher, N L; Ferrell, L et al. (1993) Evidence for a nonclassical pathway of graft rejection involving interleukin 5 and eosinophils. Transplantation 55:909-18
Krams, S M; Ascher, N L; Martinez, O M (1993) New immunologic insights into mechanisms of allograft rejection. Gastroenterol Clin North Am 22:381-400
Freise, C E; Clemmings, S; Clemens, L E et al. (1991) Demonstration of local immunosuppression with methylprednisolone in the sponge matrix allograft model. Transplantation 52:318-25

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