Cited by 31Adipose Tissue and MetabolismMitochondrial Function and PathologyMetabolism, Diabetes, and Cancer

Sex-dependent differences in rat brown adipose tissue mitochondrial biogenesis and insulin signaling parameters in response to an obesogenic diet

Nadal-Casellas, A., Bauzá-Thorbrügge, M., Proenza, A. M., Gianotti, M., Lladó, I.·2013·Molecular and Cellular Biochemistry

Abstract

Marked sex-dependent differences in mitochondrial function and redox status have been found in brown adipose tissue (BAT) of control rats. Insulin also plays a role in the development and maintenance of this tissue. The aim was to investigate sexual dimorphism in the effects of diet-induced obesity on BAT mitochondrial function, as well as on insulin signaling pathway. 10-week-old Wistar rats of both sexes were fed a control diet or a palatable high-fat diet for 26 weeks. Serum markers of insulin sensitivity were analyzed. Mitochondrial DNA (mtDNA) content, mitochondrial oxidative activities, PGC-1α mRNA levels, as well as the protein levels of insulin receptor subunit β (IRβ), glucose transporter GLUT4, β(3)-adrenergic receptor (β(3)-AR), phosphatidylinositol 3-kinase, mitochondrial transcription factor A (TFAM), cytochrome c oxidase subunit IV (COX IV), and uncoupling protein 1 (UCP1) were measured in BAT. Obese females showed impaired systemic insulin sensitivity accompanied by diminished IRβ, GLUT4, and β(3)-AR protein levels in BAT. In addition, TFAM and COX IV protein and PGC-1α mRNA levels decreased in obese females, whereas mtDNA levels increased. In obese males, oxidative and thermogenic capacities rose and no significant changes were observed in the insulin signaling pathway elements. The reduction of the insulin signaling pathway in BAT of obese females may be responsible, at least partially, for the impaired biogenesis process, which could favor the increase of body weight found in this sex. In contrast, the enhanced mitochondrial functionality in the BAT of males would avoid increased oxidative damage and the impairment of insulin signaling.

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Crossref · 10.1007/s11010-012-1481-x

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Authors
Nadal-Casellas, A., Bauzá-Thorbrügge, M., Proenza, A. M., Gianotti, M., & Lladó, I.
Affiliations
  • Research Institute of Health Sciences (ES)
  • Instituto de Salud Carlos III (ES)
Corresponding author
Gianotti, M.
Venue
Molecular and Cellular Biochemistry
Published
2012-10-29
Volume
373
Issue
1-2
Pages
125-135
ISSN
  • 0300-8177 (ISSN-L)
  • 1573-4919
OpenAlex
W2127649986
Cited by
31
References
61
Citations by year
2024: 1 · 2023: 2 · 2022: 3 · 2021: 1 · 2019: 4 · 2018: 3 · 2017: 2 · 2016: 4 · 2015: 5 · 2014: 3 · 2013: 2 · 2012: 1
FWCI
2.21
Type
journal article
Language
en
Open access
closed
Locations
  • Molecular and Cellular Biochemistry (publishedVersion)
  • PubMed (publishedVersion)
Funders
Instituto de Salud Carlos III
Topics
  • Health Sciences › Medicine › Physiology › Adipose Tissue and Metabolism
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Mitochondrial Function and Pathology
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Metabolism, Diabetes, and Cancer
Keywords
brown adipose tissue, sex differences, mitochondrial biogenesis, insulin signaling, diet-induced obesity, high-fat diet, PGC-1α, insulin receptor beta, GLUT4, beta3-adrenergic receptor, TFAM, mitochondrial DNA, UCP1, thermogenesis, oxidative capacity, insulin sensitivity
MeSH terms
Animals, Body Composition, Adipose Tissue, Brown, Energy Intake, Citrate (si)-Synthase, Electron Transport Complex IV, Female, Insulin, Male, Mitochondria, Obesity, Organ Size, Receptor, Insulin, Sex Characteristics, Signal Transduction, Rats, Wistar, Receptors, Adrenergic, beta-2, Oxidative Stress, Phosphatidylinositol 3-Kinases, Proto-Oncogene Proteins c-akt, Glucose Transporter Type 4, Rats, Diet, High-Fat, Mitochondrial Turnover

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