Influence of increased adiposity on mitochondrial-associated proteins of the rat colon A proteomic and transcriptomic analysis

A proteomic and transcriptomic analysis

Sara Padidar, Andrew J. Farquharson, Garry J. Rucklidge, Janice E. Drew

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

Epidemiological studies report obesity to be an important risk factor influencing colon pathologies, yet mechanism(s) are unknown. Recent studies have shown significant elevation of insulin, leptin and triglycerides associated with increased adipose tissue. In situ hybridisation studies have located insulin, leptin and adiponectin receptor expression in the colon epithelia. The influence of increased adiposity and associated deregulation of insulin and adipokines on regulation of the colon epithelium is unknown. Altered adipokine and insulin signalling associated with obesity has an impact on mitochondrial function and mitochondrial dysfunction is increasingly recognised as a contributing factor in many diseases. Proteomics and transcriptomics are potentially powerful methods useful in elucidating the mechanisms whereby obesity increases risk of colon diseases as observed epidemiologically. This study investigated colon mitochondrial-associated protein profiles and corresponding gene expression in colon in response to increased adiposity in a rat model of diet induced obesity. Increased adiposity in diet-induced obese sensitive rats was found to be associated with altered protein expression of 69 mitochondrial-associated proteins involved in processes associated with calcium binding, protein folding, energy metabolism, electron transport chain, structural proteins, protein synthesis and degradation, redox regulation, and transport. The changes in these mitochondrial protein profiles were not correlated with changes at the gene expression level assessed using real-time PCR arrays. (C) 2008 Elsevier B.V. All rights reserved.

Original languageEnglish
Pages (from-to)532-541
Number of pages10
JournalBiochimica et Biophysica Acta. Molecular Basis of Disease : BBA
Volume1782
Issue number9
Early online date13 Jun 2008
DOIs
Publication statusPublished - Sep 2008

Keywords

  • real-time PCR array
  • mitochondrial dysfunction
  • obesity
  • colon
  • creatine-kinase isoenzymes
  • Sprague-Dawley rats
  • gene-expression
  • permeability transition
  • colorectal-cancer
  • oxidative stress
  • insulin
  • actin
  • diet

Cite this

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title = "Influence of increased adiposity on mitochondrial-associated proteins of the rat colon A proteomic and transcriptomic analysis: A proteomic and transcriptomic analysis",
abstract = "Epidemiological studies report obesity to be an important risk factor influencing colon pathologies, yet mechanism(s) are unknown. Recent studies have shown significant elevation of insulin, leptin and triglycerides associated with increased adipose tissue. In situ hybridisation studies have located insulin, leptin and adiponectin receptor expression in the colon epithelia. The influence of increased adiposity and associated deregulation of insulin and adipokines on regulation of the colon epithelium is unknown. Altered adipokine and insulin signalling associated with obesity has an impact on mitochondrial function and mitochondrial dysfunction is increasingly recognised as a contributing factor in many diseases. Proteomics and transcriptomics are potentially powerful methods useful in elucidating the mechanisms whereby obesity increases risk of colon diseases as observed epidemiologically. This study investigated colon mitochondrial-associated protein profiles and corresponding gene expression in colon in response to increased adiposity in a rat model of diet induced obesity. Increased adiposity in diet-induced obese sensitive rats was found to be associated with altered protein expression of 69 mitochondrial-associated proteins involved in processes associated with calcium binding, protein folding, energy metabolism, electron transport chain, structural proteins, protein synthesis and degradation, redox regulation, and transport. The changes in these mitochondrial protein profiles were not correlated with changes at the gene expression level assessed using real-time PCR arrays. (C) 2008 Elsevier B.V. All rights reserved.",
keywords = "real-time PCR array, mitochondrial dysfunction, obesity, colon, creatine-kinase isoenzymes, Sprague-Dawley rats, gene-expression, permeability transition, colorectal-cancer, oxidative stress, insulin, actin, diet",
author = "Sara Padidar and Farquharson, {Andrew J.} and Rucklidge, {Garry J.} and Drew, {Janice E.}",
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AU - Rucklidge, Garry J.

AU - Drew, Janice E.

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AB - Epidemiological studies report obesity to be an important risk factor influencing colon pathologies, yet mechanism(s) are unknown. Recent studies have shown significant elevation of insulin, leptin and triglycerides associated with increased adipose tissue. In situ hybridisation studies have located insulin, leptin and adiponectin receptor expression in the colon epithelia. The influence of increased adiposity and associated deregulation of insulin and adipokines on regulation of the colon epithelium is unknown. Altered adipokine and insulin signalling associated with obesity has an impact on mitochondrial function and mitochondrial dysfunction is increasingly recognised as a contributing factor in many diseases. Proteomics and transcriptomics are potentially powerful methods useful in elucidating the mechanisms whereby obesity increases risk of colon diseases as observed epidemiologically. This study investigated colon mitochondrial-associated protein profiles and corresponding gene expression in colon in response to increased adiposity in a rat model of diet induced obesity. Increased adiposity in diet-induced obese sensitive rats was found to be associated with altered protein expression of 69 mitochondrial-associated proteins involved in processes associated with calcium binding, protein folding, energy metabolism, electron transport chain, structural proteins, protein synthesis and degradation, redox regulation, and transport. The changes in these mitochondrial protein profiles were not correlated with changes at the gene expression level assessed using real-time PCR arrays. (C) 2008 Elsevier B.V. All rights reserved.

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