Cited by 26Adipokines, Inflammation, and Metabolic DiseasesDiet, Metabolism, and DiseaseRegulation of Appetite and Obesity

RLIP76 protein knockdown attenuates obesity due to a high-fat diet

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Singhal, Sharad S., Figarola, James, Singhal, Jyotsana, Reddy, Marpadga A., Liu, Xueli, Berz, David, Natarajan, Rama, Awasthi, Sanjay·2013·Journal of Biological Chemistry

Abstract

Feeding a Western high-fat diet (HFD) to C57BL/6 mice induces obesity, associated with a chronic inflammatory state, lipid transport, and metabolic derangements, and organ system effects that particularly prominent in the kidneys. Here, we report that RLIP76 homozygous knock-out ( RLIP76 −/− ) mice are highly resistant to obesity as well as these other features of metabolic syndrome caused by HFD. The normal increase in pro-inflammatory and fibrotic markers associated with HFD induced obesity in wild-type C57B mice was broadly and nearly completely abrogated in RLIP76 −/− mice. This is a particularly striking finding because chemical markers of oxidative stress including lipid hydroperoxides and alkenals were significantly higher in RLIP76 −/− mice. Whereas HFD caused marked suppression of AMPK in wild-type C57B mice, RLIP76 −/− mice had baseline activation of AMP-activated protein kinase, which was not further affected by HFD. The baseline renal function was reduced in RLIP76 −/− mice as compared with wild-type, but was unaffected by HFD, in marked contrast to severe renal impairment and glomerulopathy in the wild-type mice given HFD. Our findings confirm a fundamental role of RLIP76 in regulating the function of obesity-promoting pro-inflammatory cytokines, and provide a novel mechanism for targeted therapy of obesity and metabolic syndrome. Background: RLIP76 homozygous knock-out mice ( RLIP76 −/− ) display a partially anti-metabolic syndrome phenotype characterized by insulin sensitivity, hypoglycemia, and hypolipidemia. Results: RLIP76 −/− mice are highly resistant to obesity as well as these other features of metabolic syndrome (MetS) caused by a high-fat diet. Conclusion: Our findings confirm a fundamental role of RLIP76 in regulating the function of obesity-promoting pro-inflammatory cytokines. Significance: Present studies provide a novel mechanism for targeted therapy of obesity and MetS.

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Authors
Singhal, S. S., Figarola, J., Singhal, J., Reddy, M. A., Liu, X., Berz, D., Natarajan, R., & Awasthi, S.
Affiliations
City Of Hope National Medical Center (US)
Corresponding author
  • Singhal, Sharad S.
  • Awasthi, Sanjay
Venue
Journal of Biological Chemistry
Publisher
Elsevier BV
Published
2013-08
Volume
288
Issue
32
Pages
23394-23406
ISSN
0021-9258 (ISSN-L)
OpenAlex
W2078739444
Cited by
26
References
60
Citations by year
2026: 2 · 2023: 2 · 2022: 3 · 2021: 4 · 2020: 4 · 2019: 4 · 2018: 2 · 2017: 1 · 2016: 1 · 2015: 1 · 2014: 2
FWCI
0.97
Type
journal article
Language
en
Open access
Locations
  • Journal of Biological Chemistry (publishedVersion, cc-by)
  • Europe PMC (PubMed Central) (publishedVersion)
  • PubMed Central (publishedVersion)
  • PubMed (publishedVersion)
Funders
  • Perricone Family Foundation
  • Beckman Research Institute, City of Hope
  • National Institutes of Health
  • National Cancer Institute (R01 CA77495, R01CA077495, P30CA033572)
  • National Institute of Diabetes and Digestive and Kidney Diseases (R01DK065073)
Topics
  • Health Sciences › Medicine › Epidemiology › Adipokines, Inflammation, and Metabolic Diseases
  • Health Sciences › Medicine › Endocrinology, Diabetes and Metabolism › Diet, Metabolism, and Disease
  • Life Sciences › Neuroscience › Endocrine and Autonomic Systems › Regulation of Appetite and Obesity
Keywords
RLIP76, obesity, high-fat diet, metabolic syndrome, inflammatory cytokines, renal fibrosis, oxidative stress, lipid hydroperoxides, alkenals, AMPK, renal function, glomerular disease, obesity resistance
MeSH terms
Animals, Dietary Fats, Enzyme Activation, Inflammation, Obesity, Biomarkers, Cytokines, Mice, Knockout, Oxidative Stress, GTPase-Activating Proteins, Metabolic Syndrome, Mice, AMP-Activated Protein Kinases, Gene Knockdown Techniques

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