Abstract

The distribution of TRH receptors in the membrane fraction of the CNS in ataxic mutant mice (C3Hf/Nem-rol and C57BL/6j-tg) was studied. TRH binding sites in cerebellum and frontal lobe of the ataxic form and the non-ataxic heterozygotes of Rolling Mouse Nagoya were decreased in comparison with the controls, whereas those in the spinal cord of Rolling Mouse Nagoya and cerebellum of Tottering Mouse were increased in the ataxic mice over the controls. Kinetic studies were performed on cerebrum and cerebellum of the different ataxic mutant mice. Such species differences in the distribution of the TRH receptors have to be considered in the action of TRH in individual ataxia cases.

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