Glycogen-storage disease in rats, a genetically determined deficiency of liver phosphorylase kinase.
Rats from an inbred strain (NZR/Mh) were found to have high concentrations of glycogen in their livers, even after 24 h of starvation. Despite this, blood glucose concentrations were well maintained on starvation for up to 72 h. The primary defect is a deficiency of liver phosphorylase kinase, causing a lack of active glycogen phosphorylase, although total phosphorylase is normal. The intravenous injection of glucagon caused a rapid activation of cyclic AMP-dependent protein kinase in the liver, but no increase in either phosphorylase kinase or phosphorylase a activity. Although total glycogen synthase activity in the livers of affected rats was higher than normal, glycogen synthase in the active form was very low, presumably as a result of the high liver glycogen content. The condition is transmitted as autosomal recessive and, apart from hepatomegaly, the affected rats appear healthy.
D000818:Animals; D001786:Blood Glucose / Q000378:metabolism; D005934:Glucagon / Q000494:pharmacology; D006003:Glycogen / Q000378:metabolism; D006008:Glycogen Storage Disease / Q000201:enzymology* / Q000235:genetics; D008099:Liver / Q000187:drug effects / Q000201:enzymology*; D008112:Liver Glycogen / Q000235:genetics / Q000378:metabolism; D010764:Phosphorylase Kinase / Q000172:deficiency*; D051381:Rats; D011919:Rats, Inbred Strains; D014018:Tissue Distribution
D001786:Blood Glucose; D008112:Liver Glycogen; D006003:Glycogen; D005934:Glucagon; D010764:Phosphorylase Kinase