Neurochemical studies on the cerebellar hypoplasia of Gunn rat (hereditary hyperbilirubinemic rat).

The cerebellar hypoplasia induced by hereditary hyperbilirubinemia in the Gunn rat was analyzed neurochemically and immunohistochemically. The antiserum against myelin basic protein was used to visualize the arborization of the fibers in the cerebellum. Arborization was very scarce in the affected lobes of the homozygous (jj) cerebellum. Na,K-ATPase activity did not show significant differences between the jj and the control (Jj) cerebellum. The concentration of norepinephrine in the jj cerebellum was about 1.5 times that of the control. However, the activation ratio of the Na,K-ATPase by norepinephrine and other catecholamines such as dopamine and isoproterenol was about twice as high as the basal activity, and no significant difference was observed between the jj and the Jj cerebella. The glutamic acid decarboxylase activity of the jj cerebellum did not differ significantly from that of the control.