[Changes of ataxia, spontaneous movement and the cerebellar noradrenaline system with aging in ataxic mice]

Changes of cerebellar weight, spontaneous movement and ataxia with aging were investigated in Weaver and cytosine arabinoside-injected mice (Ara-C). In addition, changes of cerebellar NA and MHPG concentrations in both mice were measured by high performance liquid chromatography. Cerebellar weight increased with aging in both mice. Spontaneous movements in Weaver mice were not significantly changed, but Ara-C mice showed a decreasing tendency with aging. Ataxic gait improved with aging in Weaver mice, but not in Ara-C mice. With aging, cerebellar NA and MHPG concentrations were decreased in controls, but not in Ara-C mice. In Weaver mice, cerebellar MHPG concentration was decreased. These results suggest that NA turnover in ataxic mice is different from that in controls, but is not correlated closely with ataxia.