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Prospective evaluation of aminopeptidase activities in plasma and peripheral organs of streptozotocin-induced diabetic rats

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Abstract

The cleavage of peptides by aminopeptidase enzyme types could be among the mechanisms related to certain disruptions on mediator and modulatory functions in diabetes mellitus. In order to examine this hypothesis, we measured representative aminopeptidase activities in tissues of peripheral organs of control and streptozotocin-diabetic rats. None of the examined aminopeptidase activities differed between diabetics and controls in plasma, ileum, stomach or lung. Soluble and membrane-associated alanyl, and membrane-associated cystyl aminopeptidase activities were higher in the kidney of diabetics. Decreased activity was observed in soluble and membrane-associated aspartyl and soluble dipeptidyl-peptidase IV, while increased activity was observed in soluble alanyl, arginyl, and cystyl aminopeptidases in the pancreas of diabetics. In the jejunum, soluble cystyl aminopeptidase increased in diabetics. Soluble arginyl and type-1-pyroglutamyl aminopeptidase and membrane-associated dipeptidyl-peptidase IV activities increased in the liver of diabetics. Membrane-associated dipeptidyl-peptidase IV and alanyl aminopeptidase activities in the spleen were higher in diabetics than in controls. Membrane-associated alanyl aminopeptidase activity also increased in the heart of diabetics. All these changes in streptozotocin-treated rats were avoided by the administration of insulin. Our comparative analysis of a diverse array of aminopeptidase activities supported the proposal that the regulation of peptide cleavage by these enzyme types is associated with the effects of strep-tozotocin-diabetes mellitus on peripheral organs.

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Authors and Affiliations

  1. Laboratory of Pharmacology, Instituto Butantan, Av. Vital Brazil, 1500, 05503-900, Sao Paulo, SP, Brazil

    L. Zambotti-Villela, S. C. Yamasaki, J. S. Villarroel, R. F. Alponti & P. F. Silveira PhD

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  1. L. Zambotti-Villela
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  2. S. C. Yamasaki
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  3. J. S. Villarroel
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  4. R. F. Alponti
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  5. P. F. Silveira PhD
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Correspondence to P. F. Silveira PhD.

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Zambotti-Villela, L., Yamasaki, S.C., Villarroel, J.S. et al. Prospective evaluation of aminopeptidase activities in plasma and peripheral organs of streptozotocin-induced diabetic rats. J Endocrinol Invest 31, 492–498 (2008). https://doi.org/10.1007/BF03346396

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