Neural transplantation in mouse Parkinson's disease.

A complete recovery from the methamphetamine-induced rotational response was shown in C57BL/6 (H-2b) mice which had had unilateral 6-OHDA lesions in the nigrostriatal pathway about 60 days after transplantation of approximately 1 x 106 dopamine-rich cells from syngeneic or allogeneic (C3H/HeN, H-2k) mouse embryos (ED 15), without immunosuppressive agents. Morphological examination showed tyrosine-hydroxylase-immunoreactive cell clusters around the needle tract in the mice which were transplanted not only with syngeneic cells but also with allogeneic cells. This might indicate that so-called immunosuppressive agents are not necessary for grafted embryonic cells to survive in an allogeneic mouse brain.