Relationship of Plasma Total Bilirubin, Apparent Unbound Bilirubin and Total Albumin with Cerebellar Glycogen and Abnormal Purkinje Cells in the Gunn Rat

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Abstract
Total plasma bilirubin, apparent unbound plasma bilirubin, cerebellar glycogen and Purkinje cells were quantified in heterozygous Gunn rats, homozygous Gunn rats and normal Wistar rats. Our results indicated that, in the Gunn rat, total bilirubin, apparent unbound bilirubin, and the bilirubin/albumin molar ratio are highly correlated with each other and with alterations in cerebellar Purkinje cells and accumulation of cerebellar glycogen. In addition, cerebella of heterozygous Gunn rats contained many abnormal Purkinje cells without intramitochondrial glycogen and cerebella of homozygous Gunn rats showed many Purkinje cells with intramitochondrial glycogen. Our results demonstrate previously unreported differences between heterozygous Gunn rats and controls. We suggest that a population of Purkinje cells in the heterozygous Gunn rats may have received a cellular insult from fetal exposure to bilirubin.