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The pituitary neurointermediate lobe of genetically obese (ob/ob) mice contains a hormone which stimulates insulin release and which cross-reacts with a -COOH-terminal ACTH antiserum, suggesting that it is related to corticotropin-like intermediate lobe peptide (CLIP), the 18-39 fragment of ACTH. The hormone, which we have called beta-cell-tropin, has been shown to be present in the plasma of the ob/ob mouse and to potentiate glucose induced insulin secretion. We have now shown that ACTH22-39 prepared by tryptic digestion of human synthetic CLIP behaves similarly on Biogel chromatography and on reverse-phase HPLC to the naturally occurring beta-cell-tropin. Furthermore, beta-cell-tropin and ACTH22-39 have indistinguishable antigenic and insulin releasing properties. 相似文献
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