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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Omega-3 Supplementation Improves Pancreatic Islet Redox Status In Vivo and In Vitro Studies

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Author(s):
Lucena, Camila F. [1] ; Roma, Leticia P. [1] ; Graciano, Maria Fernanda R. [2] ; Veras, Katherine [1] ; Simoes, Daniel [1] ; Curi, Rui [1] ; Carpinelli, Angelo R. [1]
Total Authors: 7
Affiliation:
[1] Univ Sao Paulo, Inst Biomed Sci, Dept Physiol & Biophys, BR-05508000 Sao Paulo - Brazil
[2] Univ Londrina, Dept Physiol Sci, Londrina, Parana - Brazil
Total Affiliations: 2
Document type: Journal article
Source: PANCREAS; v. 44, n. 2, p. 287-295, MAR 2015.
Web of Science Citations: 6
Abstract

Objectives: The aim of the study was to evaluate the potential changes induced by fish oil (FO) supplementation on the redox status of pancreatic islets from healthy rats. To test whether these effects were due to eicosapentaenoic acid and docosahexaenoic acid (omega-3), in vitro experiments were performed. Methods: Rats were supplemented with FO, and pancreatic islets were obtained. Islets were also treated in vitro with palmitate (P) or eicosapentaenoic acid + docosahexaenoic acid (omega-3). Insulin secretion (GSIS), glucose oxidation, protein expression, and superoxide content were analyzed. Results: The FO group showed a reduction in superoxide content. Moreover, FO reduced the expression of NAD(P) H oxidase subunits and increased superoxide dismutase, without altering beta-cell function. Palmitate increased beta-cell reactive oxygen species (ROS) production, apoptosis, and impaired GSIS. Under these conditions, omega-3 triggered a parallel reduction in ROS production and beta-cell apoptosis induced by P and protected against the impairment in GSIS. There was no difference in mitochondrial ROS production. Conclusions: Our results show that omega-3 protect pancreatic islets from alterations induced by P. In vivo FO supplementation modulates the redox state of pancreatic beta-cell. Considering that in vitro effects do not involve mitochondrial superoxide production, we can speculate that this protection might involve NAD(P) H oxidase activity. (AU)

FAPESP's process: 12/16374-4 - POSSIBLE PROTECTIVE EFFECTS OF EPA AND DHA AGAINST APOPTOSIS INDUCED BY PALMITATE IN PANCREATIC ISLETS IN CULTURE
Grantee:Camila Ferraz Lucena Monaco
Support Opportunities: Scholarships in Brazil - Doctorate