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Chemokine expression in nerve allografts
Rajiv Midha1, Catherine A Munro, Vankayalapati Ramakrishna
1Division of Neurosurgery and Neuroscience Research Program, Department of Surgery, Sunnybrook and Women's College Health Sciences Centre, University of Toronto, Toronto, Ontario, Canada. rajiv.madha@sw.ca
Neurosurgery
|May 26, 2004
Summary
Chemokines like MIP-1 alpha, MIP-2, and RANTES attract immune cells to nerve allografts, initiating rejection. Blocking these chemokines may prevent nerve allograft rejection.
Area of Science:
- Immunology
- Transplantation Biology
- Molecular Medicine
Background:
- Chemokines are crucial for immune cell trafficking to inflammatory sites.
- Immune cell infiltration is key to allograft rejection.
- The specific role of chemokines in nerve allograft rejection remains unclear.
Purpose of the Study:
- To investigate the role of chemokines in nerve allograft rejection.
- To test the hypothesis that chemokines attract macrophages and T lymphocytes to nerve allografts, initiating rejection.
Main Methods:
- Lewis rats received peroneal nerve allografts and isografts.
- Intragraft chemokine gene expression (cytokine-induced neutrophil chemoattractant, MIP-2, MCP-1, MIP-1 alpha, RANTES) was analyzed via RT-PCR from 12 hours to 10 days post-transplantation.
Main Results:
- Cytokine-induced neutrophil chemoattractant and monocyte chemoattractant protein-1 were expressed in both allografts and isografts early post-transplantation.
- MIP-1 alpha, MIP-2, and RANTES were exclusively expressed in allografts.
- MIP-1 alpha and MIP-2 showed early onset and rapid decline, while RANTES exhibited delayed kinetics with a peak at Day 4.
Conclusions:
- Chemokine gene induction precedes immune cell infiltration in nerve allografts.
- MIP-1 alpha, MIP-2, and RANTES likely recruit macrophages, granulocytes, and lymphocytes, respectively.
- Targeting these chemokines or their receptors could be a strategy to prevent nerve allograft rejection.