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The insulin-degrading activity of liver supernatants and epididymal adipose-tissue homogenates from genetically obese-hyperglycaemic mice (ob ob) and their lean litter mates was studied by measurement of radioactive trichloroacetic acid-soluble degradation products of the insulin molecule. Optimum assay conditions for the decomposition of the hormone were devised. The properties of the degrading activity suggested the presence of enzymic insulin destruction in both the liver and epididymal adipose tissue. There was no difference in insulin degradation in liver samples from obese and lean mice when the results were related to the protein content of the supernatants. The epididymal adipose-tissue homogenates from obese mice displayed about eightfold higher degrading activity per unit of protein than did homogenates from lean animals. The physiological significance of this finding is discussed in the light of the increased fat depots, hyperphagia, raised serum insulin concentrations and increased insulin tolerance previously recorded in this strain of mice.

Degradation of insulin in vitro by liver and epididymal adipose tissue from obese–hyperglycaemic mice