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Eur J Nutr. 2015 Oct;54(7):1139-49. doi: 10.1007/s00394-014-0790-0. Epub 2014 Nov 5.

Increased body fat mass and tissue lipotoxicity associated with ovariectomy or high-fat diet differentially affects bone and skeletal muscle metabolism in rats.

Author information

1
INRA, UMR 1019, UNH, CRNH Auvergne, 63000, Clermont-Ferrand, France.
2
Clermont Université, Université d'Auvergne, Unité de Nutrition Humaine, BP 10448, 63000, Clermont-Ferrand, France.
3
Lesieur, Asnieres-Sur-Seine, France.
4
UMR 1260, INRA, 13385, Marseille, France.
5
Nutrition, Obésité et Risque Thrombotique, UMR 1062, INSERM, 13385, Marseille, France.
6
Faculté de Médecine, Université d'Aix-Marseille, 13385, Marseille, France.
7
INRA, UMR 1019, Plateforme d'Exploration du Métabolisme, UNH, 63000, Clermont-Ferrand, France.
8
CHU Clermont-Ferrand, Service de Nutrition Clinique, 63003, Clermont-Ferrand, France.
9
INRA, UMR 1019, UNH, CRNH Auvergne, 63000, Clermont-Ferrand, France. swalrand@clermont.inra.fr.
10
Clermont Université, Université d'Auvergne, Unité de Nutrition Humaine, BP 10448, 63000, Clermont-Ferrand, France. swalrand@clermont.inra.fr.
11
Centre de recherche de Clermont-Theix-Lyon, 58 rue Montalembert, 63003, Clermont-Ferrand, France. swalrand@clermont.inra.fr.

Abstract

PURPOSE:

The aim of this study was to evaluate and compare the musculoskeletal effects induced by ovariectomy-related fat mass deposition against the musculoskeletal effects caused by a high-fat diet.

METHODS:

A group of adult female rats was ovariectomized and fed a control diet. Two additional groups were sham-operated and fed a control or a high-fat diet for 19 weeks. Distal femur and serum bone parameters were measured to assess bone metabolism. Muscle protein metabolism, mitochondrial markers and triglyceride content were evaluated in tibialis anterior. Triglyceride content was evaluated in liver. Circulating inflammatory and metabolic markers were determined.

RESULTS:

The high-fat diet and ovariectomy led to similar increases in fat mass (+36.6-56.7%; p < 0.05) but had different impacts on bone and muscle tissues and inflammatory markers. Consumption of the high-fat diet led to decreased bone formation (-38.4%; p < 0.05), impaired muscle mitochondrial metabolism, muscle lipotoxicity and a 20.9% increase in tibialis anterior protein synthesis rate (p < 0.05). Ovariectomy was associated with higher bone turnover as bone formation increased +72.7% (p < 0.05) and bone resorption increased +76.4% (p < 0.05), leading to bone loss, a 17.9% decrease in muscle protein synthesis rate (p < 0.05) and liver lipotoxicity.

CONCLUSIONS:

In female rats, high-fat diet and ovariectomy triggered similar gains in fat mass but had different impacts on bone and muscle metabolism. The ovariectomy-induced mechanisms affecting the musculoskeletal system are mainly caused by estrogen depletion, which surpasses the potential-independent effect of adiposity.

KEYWORDS:

Adipose tissue; Bone; Osteoporosis; Sarcopenia; Skeletal muscle

PMID:
25370302
DOI:
10.1007/s00394-014-0790-0
[Indexed for MEDLINE]

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