Estimations have been made on abilities of certain tissues of mice injected intravenously with insulin I-131 to concentrate and degrade this compound; change of I-131 from TCA insoluble to TCA soluble form has been used as measure of degradation. Insulin I-131, estimated as TCA insoluble I-131, was concentrated by liver and especially by kidney; formation of TCA soluble I-131 occurred most rapidly in liver. With insulin I-131 held constant but total insulin progressively increased, concentration ratios for TCA insoluble I-131 progressively increased in kidney, and decreased in other tissues. In all tissues, conversion of I-131 from TCA insoluble to TCA soluble form decreased progressively with increase in total insulin. Prior mixing of insulin I-131 with excess guinea pig anti-insulin serum (AIS) resulted in loss of tissue abilities to convert the I-131 into TCA soluble form, and in loss of abilities of all tissues other than liver to concentrate this TCA insoluble I-131.
On Insulin 1-131 Metabolism in Mice: Modifying Effects of Anti-insulin Serum and of Total Insulin Dosage
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Lyle V Beck, Daniel S Zaharko, Nancy Oberts, Christine King; On Insulin 1-131 Metabolism in Mice: Modifying Effects of Anti-insulin Serum and of Total Insulin Dosage. Diabetes 1 May 1966; 15 (5): 336–341. https://doi.org/10.2337/diab.15.5.336
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