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Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)
 
 
 
 
 

The rate of degradation of liver glycogen phosphorylase is specifically decreased in the C57BL/KsJ-db/db mouse.

We have recently demonstrated that the activity of liver glycogen phosphorylase, the rate-limiting enzyme of glycogenolysis, is elevated in genetically diabetic (db/db) mouse and that it is primarily due to the presence of increased amounts of this enzyme. In the present study, we examined the turnover of glycogen phosphorylase in vivo in order to elucidate the mechanism for this specific increase. The rate of phosphorylase synthesis was slightly decreased in the diabetic mouse compared to controls. However, the relative rates of synthesis were similar in these two groups. The rate of degradation of this enzyme was decreased 20% (p less than 0.05) in the diabetic mouse compared to controls. More importantly, the relative rate of degradation of phosphorylase was found to be lower in the diabetic animals. This indicates that the elevated concentration of phosphorylase in the liver of the db/db mouse is likely due to a specific decrease in its rate of degradation.[1]

References

  1. The rate of degradation of liver glycogen phosphorylase is specifically decreased in the C57BL/KsJ-db/db mouse. Roesler, W.J., Nijjar, M.S., Khandelwal, R.L. Mol. Cell. Biochem. (1989) [Pubmed]
 
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