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. 1976 Apr;57(4):1089–1092. doi: 10.1172/JCI108352

Inhibition of insulin degradation by nonsuppressible insulin-like activity.

G Burghen, W C Duckworth, A E Kitabchi, S S Solomon, P L Poffenbarger
PMCID: PMC436754  PMID: 947951

Abstract

Nonsuppressible insulin-like activity, provided by three sources, was evaluated for its effect on the proteolytic degradation of insulin utilizing insulin protease obtained from rat liver homogenate as well as liver cell membranes. All three preparations of nonsuppressible insulin-like activity were found to be competitive inhibitors of insulin degradation. In addition human plasma was fractionated yielding an acetone precipitate which was found to have nonsuppressible insulin-like activity and to be a competitive inhibitor of insulin protease.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

  1. ANTONIADES H. N. Studies on the state of insulin in blood: the state and transport of insulin in blood. Endocrinology. 1961 Jan;68:7–16. doi: 10.1210/endo-68-1-7. [DOI] [PubMed] [Google Scholar]
  2. Baskin F. K., Kitabchi A. E. Substrate studies for insulin-specific protease. Eur J Biochem. 1973 Sep 3;37(3):489–496. doi: 10.1111/j.1432-1033.1973.tb03010.x. [DOI] [PubMed] [Google Scholar]
  3. Burghen G. A., Kitabchi A. E., Brush J. S. Characterization of a rat liver protease with specificity for insulin. Endocrinology. 1972 Sep;91(3):633–642. doi: 10.1210/endo-91-3-633. [DOI] [PubMed] [Google Scholar]
  4. Bürgi H., Müller W. A., Humbel R. E., Labhart A., Froesch E. R. Non-suppressible insulin-like activity of human serum. I. Physicochemical properties, extraction and partial purification. Biochim Biophys Acta. 1966 Jun 29;121(2):349–359. doi: 10.1016/0304-4165(66)90124-3. [DOI] [PubMed] [Google Scholar]
  5. Cresto J. C., Lavine R. L., Fink G., Recant L. Plasma proinsulin. Comparison of insulin specific protease and gel filtration assays. Diabetes. 1974 Jun;23(6):505–511. doi: 10.2337/diab.23.6.505. [DOI] [PubMed] [Google Scholar]
  6. Duckworth W. C., Heinemann M. A., Kitabchi A. E. Purification of insulin-specific protease by affinity chromatography. Proc Natl Acad Sci U S A. 1972 Dec;69(12):3698–3702. doi: 10.1073/pnas.69.12.3698. [DOI] [PMC free article] [PubMed] [Google Scholar]
  7. Duckworth W. C., Heinemann M., Kitabchi A. E. Proteolytic degradation of insulin and glucagon. Biochim Biophys Acta. 1975 Feb 19;377(2):421–430. doi: 10.1016/0005-2744(75)90322-8. [DOI] [PubMed] [Google Scholar]
  8. Duckworth W. C., Kitabchi A. E. Direct measurement of plasma proinsulin in normal and diabetic subjects. Am J Med. 1972 Oct;53(4):418–427. doi: 10.1016/0002-9343(72)90137-4. [DOI] [PubMed] [Google Scholar]
  9. Freychet P., Kahn R., Roth J., Neville D. M., Jr Insulin interactions with liver plasma membranes. Independence of binding of the hormone and its degradation. J Biol Chem. 1972 Jun 25;247(12):3953–3961. [PubMed] [Google Scholar]
  10. Kitabchi A. E., Duckworth W. C., Brush J. S., Heinemann M. Direct measurement of proinsulin in human plasma by the use of an insulin-degrading enzyme. J Clin Invest. 1971 Sep;50(9):1792–1799. doi: 10.1172/JCI106669. [DOI] [PMC free article] [PubMed] [Google Scholar]
  11. Kitabchi A. E., Stentz F. B. Degradation of insulin and proinsulin by various organ homogenates of rat. Diabetes. 1972 Nov;21(11):1091–1101. doi: 10.2337/diab.21.11.1091. [DOI] [PubMed] [Google Scholar]
  12. Kitabchi A. E. The biological and immunological properties of pork and beef insulin, proinsulin, and connecting peptides. J Clin Invest. 1970 May;49(5):979–987. doi: 10.1172/JCI106317. [DOI] [PMC free article] [PubMed] [Google Scholar]
  13. Neville D. M., Jr Isolation of an organ specific protein antigen from cell-surface membrane of rat liver. Biochim Biophys Acta. 1968 Apr 9;154(3):540–552. doi: 10.1016/0005-2795(68)90014-7. [DOI] [PubMed] [Google Scholar]
  14. Poffenbarger P. L. The purification and partial characterization of an insulin-like protein from human serum. J Clin Invest. 1975 Dec;56(6):1455–1463. doi: 10.1172/JCI108226. [DOI] [PMC free article] [PubMed] [Google Scholar]
  15. Solomon S. S., Ensinck J. W., Williams R. H. Effect of starvation on plasma immunoreactive insulin and non-suppressible insulin-like activity in normal and obese humans. Metabolism. 1968 Jun;17(6):528–534. doi: 10.1016/0026-0495(68)90045-0. [DOI] [PubMed] [Google Scholar]
  16. Solomon S. S., Poffenbarger P. L., Hepp D. K., Fenster L. F., Ensinck J. W., Williams R. H. Quantitation and partial characterization of nonsuppressible insulin-like activity in serum and tissue extracts of the rat. Endocrinology. 1967 Aug;81(2):213–225. doi: 10.1210/endo-81-2-213. [DOI] [PubMed] [Google Scholar]
  17. Starr J. I., Juhn D. D., Rubenstein A. H. Degradation of insulin in serum by insulin-specific protease. J Lab Clin Med. 1975 Oct;86(4):631–637. [PubMed] [Google Scholar]

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