This study was performed to see whether local injection of dexamethasone may protect the neural grafts from immunological rejection and increase the successive rate of graft. Rats with unilateral 6-hydroxydopamine lesions of the mesostriatal dopamine pathway received fetal ventral mesencephalic (FVM) cells and dexamethasone in two regions of the striatum and showed significant (P<0.001) reduction in rotational asymmetry as compared to the non-immunosuppressed group. A significantly greater number of total TH-ir cells (P<0.001) and fewer number of total GFAP -ir cells (P<0.001) and inflammatory cells were observed in the striatum of animals in immunosuppressed group than those in non-immunosuppressed group. This results indicated that local injection of dexamethasone could not only reduce the immune rejection and increase the survival grafted cell but also avoid the side effects brought by long systemic administer of immunosuppressant.
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