• JoomlaWorks Simple Image Rotator
  • JoomlaWorks Simple Image Rotator
  • JoomlaWorks Simple Image Rotator
  • JoomlaWorks Simple Image Rotator
  • JoomlaWorks Simple Image Rotator
  • JoomlaWorks Simple Image Rotator
  • JoomlaWorks Simple Image Rotator
  • JoomlaWorks Simple Image Rotator
  • JoomlaWorks Simple Image Rotator
  • JoomlaWorks Simple Image Rotator
 
  Bookmark and Share
 
 
Doctoral Thesis
DOI
https://doi.org/10.11606/T.42.2010.tde-11012011-095428
Document
Author
Full name
Laila Romagueira Bichara dos Santos
Institute/School/College
Knowledge Area
Date of Defense
Published
São Paulo, 2010
Supervisor
Committee
Carpinelli, Angelo Rafael (President)
Anhê, Gabriel Forato
Carneiro, Everardo Magalhães
Hirata, Aparecida Emiko
Salgado, Thais Martins de Lima
Title in Portuguese
Participação da NAD(P)H oxidase no direcionamento do metabolismo induzido pelo ácido oléico durante o processo de secreção de insulina.
Keywords in Portuguese
Ácidos graxos
Ativação enzimática
Insulina
Metabolismo
Secreção (Fisiologia)
Abstract in Portuguese
Ácidos graxos são requeridos para a manutenção da função celular e atuam como moduladores da secreção de insulina induzida. Os importantes sítios de formação de EROs são a mitocôndria e a NAD(P)H oxidase, a primeira pode alterar a produção de EROs em função da atividade metabólica e a segunda tem sua atividade regulada por diversos fatores, dentre eles a PKC .O ácido oléico, junto com o palmítico, é um dos AGs mais abundantes na circulação. O tratamento agudo (1 hora) com 100 µM de ácido oléico aumentou a secreção de insulina associado ao aumento no metabolismo do AG. A oxidação desse ácido graxo induziu aumento no conteúdo de EROs em 16,7 mM de glicose com participação da NAD(P)H oxidase. Apesar da reconhecida função da EROs como sinalizadores, a diminuição de EROs induzida pela inibição da NAD(P)H oxidase promoveu aumento relativo na oxidação da glicose. A secreção relativa de insulina aumentou após inibição da NAD(P)H oxidase, sugerindo função regulatória das EROs no metabolismo da glicose e, conseqüentemente, da secreção de insulina. Dessa forma, o ácido oléico é capaz de aumentar a secreção de insulina com participação da NAD(P)H oxidase e as EROs produzidas por essa enzima promovendo a regulação do metabolismo da glicose.
Title in English
NAD(P)H oxidase participates in the oleic acid-induced metabolic channelling during insulin secretion.
Keywords in English
Enzyme activation
Fatty acids
Insulin
Metabolism
Secretion (Physiology)
Abstract in English
Fatty acids are required to maintain cellular functioning and are able to modulate insulin secretion from pancreatic islets. The important sites of ROS production are the mitochondria and the NAD(P)H oxidase. The mitochondrial ROS release depends on cellular activity and NAD(P)H oxidase activity depends on many factors, including PKC. Acute (1 hour) exposure to oleic acid increased insulin secretion at 16.7 mM glucose. The insulin secretion induced by OA was associated to increased fatty acid oxidation and decreased glucose metabolism. Also, at 16.7 mM glucose, OA oxidation increased ROS production mediated by NAD(P)H. ROS decreased content induced by NAD(P)H oxidase inhibition induced glucose oxidation re-establishment after OA stimulus. The relative secretion was stimulated by NAD(P)H oxidase inhibition after OA stimulus. This suggests that ROS produced by NAD(P)H oxidase act as glucose metabolism regulators in the pancreatic cell. In consequence of glucose metabolism re-establishment the insulin secretion was increased. In conclusion, ROS produced by NAD(P)H oxidase are regulators of glucose metabolism. The glucose metabolism regulation may be in part responsible for the increased insulin secretion induced by ROS.
 
WARNING - Viewing this document is conditioned on your acceptance of the following terms of use:
This document is only for private use for research and teaching activities. Reproduction for commercial use is forbidden. This rights cover the whole data about this document as well as its contents. Any uses or copies of this document in whole or in part must include the author's name.
Publishing Date
2011-04-28
 
WARNING: Learn what derived works are clicking here.
All rights of the thesis/dissertation are from the authors
CeTI-SC/STI
Digital Library of Theses and Dissertations of USP. Copyright © 2001-2024. All rights reserved.