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Title: Insulin degradation by adipose tissue is increased in human obesity
Author: Rafecas Jorba, Immaculada
Fernández López, José Antonio
Salinas, Isabel
Formiguera Sala, X.
Remesar Betlloch, Xavier
Foz Sala, M. (Màrius)
Alemany, Marià, 1946-
Keywords: Insulina
Issue Date: 1995
Publisher: The Endocrine Society
Abstract: White adipose tissue samples from obese and lean patients were used for the estimation ofinsulin protease and insulin:glutathione transhydrogenase using 1251-labeled insulin. There was no activity detected in the absence of reduced glutathione, which indicates that insulin is cleaved in human adipose "tissue through reduction of the disulfide bridge between the chains. O bese patients showed higher transhydrogenase activity (per U tissue protein wt, per U tissue wt, and in the total adipose tissue mass) than the lean group. There is a significant correlation between the activity per U tissue wt, and protein and total activity in the whole adipose tissue with respect to body mass index, with a higher activity in obese patients. The potential ofinsulin cleavage by adipose tissue in obese patients was a mean 5.6-fold higher than that in controla. The coexistence of high insulinemia and high cleavage capability implies that insulin secretion and turnover are increased in the o bese. Thus, white adipose tissue may be crucial in the control of energy availability through modulation ofinsulin cleavage.
Note: Reproducció del document publicat a:
It is part of: Journal of Clinical Endocrinology and Metabolism, 1995, vol. 80, p. 693-695
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ISSN: 0021-972X
Appears in Collections:Articles publicats en revistes (Nutrició, Ciències de l'Alimentació i Gastronomia)

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