Abstract
Transplantation of foetal SCN tissue into the brain of arrhythmic SCN-lesioned rats and hamsters has shown to be effective in restoring circadian rhythms. Transplantation of the SCN into normal untreated rats has not been described so far as function is concerned. In rats certain demands have to be met for successful grafting of the SCN. Location, age and method of transplantation play an important role in the survival and function of the graft. This paper describes a method for SCN transplantation in normal rats. Results show transplant survival in 95% and successful grafting of SCN tissue in 85% of the treated rats as shown by VP and VIP staining. Disturbed circadian eating, drinking and activity rhythms are noted when grafts are located very near the endogenous SCN. Rhythms of wheel running and body temperature were less affected. The method described seems therefore well suited to do further research with circadian rhythms.
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