Abstract
Background
Decreased muscle mass or sarcopenia has been associated with nonalcoholic fatty liver disease (NAFLD). However, the functional consequences of this association and its pathogenesis remain ill-defined.
Aims
To evaluate muscle mass and function in a diet-induced NAFLD mouse model and explore its association with changes in serum insulin-like growth factor-1 (IGF-1).
Methods
Weight gain, visceral fat, serum biochemical parameters, liver histology, and hepatic triglyceride content (HTC) were assessed in C57/Bl6 mice fed a westernized diet during 16 weeks. In addition, we determined muscle fiber size and strength of limb skeletal muscle, myosin heavy chain (MHC) protein levels, and IGF-1 serum levels.
Results
Westernized diet feeding was associated with weight gain, increased visceral fat mass (epididymal pad weight: 0.76 g ± 0.13 vs. 0.33 ± 0.27 g; p = 0.0023), hepatic steatosis (HTC: 118.2 ± 6.88 mg/g liver vs. 43.26 ± 5.63 mg/g<, p < 0.05), and necroinflammation (histological scores: 1.29 ± 0.42 vs. 4.00 ± 0.53<, p < 0.05). Also, mice fed the experimental diet had an increased proportion of low-diameter muscle fibers (0–30 μm) and a decreased proportion of high-diameter muscle fibers (60–90 μm), which correlated with decreased MHC protein levels, consistent with significant muscle atrophy. Functional studies showed that mice fed a westernized diet had reduced muscle strength and lower serum levels of IGF-1 (284.2 ± 20.04 pg/ml) compared with chow-fed mice (366.0 ± 12.42 pg/ml, p < 0.05).
Conclusion
Experimental NAFLD is associated with sarcopenia, decreased muscle strength, and reduced IGF-1 serum levels. IGF-1 reduction may be involved in pathogenesis of NAFLD-associated sarcopenia.
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Abbreviations
- NAFLD:
-
Nonalcoholic fatty liver disease
- IGF-1:
-
Insulin-like growth factor 1
- HTC:
-
Hepatic triglyceride content
- MHC:
-
Myosin heavy chain
- NASH:
-
Nonalcoholic steatohepatitis
- KNHANES:
-
Korea National Health and Nutrition Examination Survey
- ALIOS:
-
American lifestyle-induced obesity syndrome
- NAS:
-
NAFLD activity score system
- TA:
-
Tibialis anterior
- Lo:
-
Optimum muscle length
- Po:
-
Maximum isometric tetanic force
- CSA:
-
Cross-sectional area
- WGA:
-
Wheat germ agglutinin
- ALT:
-
Alanine aminotransferase
- IL1β:
-
Interleukin-1 beta
- IL-6:
-
Interleukin-6
- IL-8:
-
Interleukin-8
- IL-10:
-
Interleukin-10
- IL-12:
-
Interleukin-12
- NAS:
-
NAFLD activity score
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Acknowledgments
This study was supported by research grants from the Fondo Nacional de Desarrollo Cientıfico y Tecnologico (FONDECYT 1150327 to M.A., 1161646 to C.C.V., 1150311 to F.B. and PD3140396 to D.C.) and the Comision Nacional de Investigacion Cientıfica y Tecnologica (Grant CONICYT PIA/Basal PFB12, Basal Centre for Excellence in Science and Technology to M.A.) both from the Government of Chile. Association-Francaise Contre Les Myopathies AFM 16670 (C.C.V.), Millennium Institute on Immunology and Immunotherapy, P09-016-F (C.C.V.), UNAB DI-741-15/N (C.C.V.).
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Daniel Cabrera and Alex Ruiz have contributed equally to this work.
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Supplementary Figure 1
Serum inflammatory cytokines profile in the American Lifestyle-Induced Obesity Syndrome [ALIOS]-diet mouse model of NAFLD. Serum was isolated from 16-weeks ALIOS diet-fed mice to evaluate the levels of IL-12, IL-10, IL-6, IL-1b, and IL-8 through a cytometric bead array (CBA) (JPEG 480 kb)
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Cabrera, D., Ruiz, A., Cabello-Verrugio, C. et al. Diet-Induced Nonalcoholic Fatty Liver Disease Is Associated with Sarcopenia and Decreased Serum Insulin-Like Growth Factor-1. Dig Dis Sci 61, 3190–3198 (2016). https://doi.org/10.1007/s10620-016-4285-0
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DOI: https://doi.org/10.1007/s10620-016-4285-0