Abstract
Background/purpose of the study
Although low skeletal muscle mass is associated with non-alcoholic fatty liver disease (NAFLD), it is currently uncertain whether there are associations between weight-adjusted appendicular skeletal muscle (ASM%), severity of histological features of NAFLD, and the patatin-like phospholipase domain-containing 3 (PNPLA3) rs738409 polymorphism. Our aim was to test for a possible influence of the PNPLA3 rs738409 variant on the association between ASM% and severity of NAFLD histological features.
Methods
We enrolled 401 Chinese male with biopsy-proven NAFLD. Using a bioelectrical-impedance body composition analyzer (BIA, Inbody 720, Japan Inc., Tokyo), we calculated the ASM% as the percentage of total appendicular skeletal muscle mass (ASM, kg)/total body mass (kg) × 100.
Results
Compared to those with high ASM%, patients with low ASM% (≤ 30.6, i.e., the median value of distribution of the whole sample) had a greater severity of individual histological features of NAFLD. These patients also had a higher risk of severe steatosis and non-alcoholic steatohepatitis (NASH) (adjusted-odds ratio [OR] 2.34, 95% CI 1.39–3.93, and adjusted-OR 2.22, 95% CI 1.30–3.77) even after adjusting for age, body mass index, diabetes, and serum creatinine levels. Carriage of the G allele of PNPLA3 rs738409 plus low ASM% was associated with a higher risk of severe steatosis and presence of liver fibrosis (OR 3.02, 95% CI 1.46–6.26, p = 0.003 and OR 2.18, 95% CI 1.03–4.60, p = 0.041 respectively), and there was a non-significant but borderline increased risk of NASH (OR 2.00, 95% CI 0.98–4.06, p = 0.056).
Conclusions
Low ASM% and the presence of a G allele within PNPLA3 rs738409 is associated with more severe histological features of NAFLD.
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Abbreviations
- NAFLD:
-
Non-alcoholic fatty liver disease
- BMI:
-
Body mass index
- ASM%:
-
Weight-adjusted appendicular skeletal muscle
- HOMA-IR:
-
Homeostasis model assessment-insulin resistance
- AST:
-
Aspartate aminotransferase
- ALT:
-
Alanine aminotransferase
- GGT:
-
γ-Glutamyltranspeptidase
- ALP:
-
Alkaline phosphatase
- HDL:
-
High-density lipoprotein
- LDL:
-
Low-density lipoprotein
- CK-18:
-
Cytokeratin-18
- PNPLA3 :
-
Patatin-like phospholipase domain-containing 3
- NAS:
-
NAFLD activity score
- NASH:
-
Non-alcoholic steatohepatitis
- BIA:
-
Bioelectrical impedance analyzer
- CI:
-
Confidence interval
- NASH-CRN:
-
NASH-Clinical Research Network
- OR:
-
Odds ratio
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Funding
This work was supported by grants from the National Natural Science Foundation of China (82070588), High Level Creative Talents from Department of Public Health in Zhejiang Province and Project of New Century 551 Talent Nurturing in Wenzhou. GT is supported in part by grants from the School of Medicine, University of Verona, Verona, Italy. CDB is supported in part by the Southampton NIHR Biomedical Research Centre (IS-BRC-20004), UK. XYP is supported in part by grants from Wenzhou science and technology Bureau (Y20180141).
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Guarantor of the article: M-HZ. Authors’ contributions: Study concept and design: X-YP, W-YL and M-HZ. Acquisition of data: P-WZ, GL, L-JT, O-YH, H-YY. Pathology analysis: X-DW. Drafting of the manuscript: X-YP and W-YL. Critical revision and comment: GT and CDB. Statistical analysis: X-YP, W-YL, FG. Study supervision: M-HZ. All authors contributed to the manuscript for important intellectual content and approved the submission.
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All the authors (Xiao-Yan Pan, Wen-Yue Liu, Pei-Wu Zhu, Gang Li, Liang-Jie Tang, Feng Gao, Ou-Yang Huang, Hai-Yang Yuan, Giovanni Targher, Christopher D. Byrne, Xiao-Dong Wang, Ming-Hua Zheng) declare that they do not have anything to disclose regarding any funding or conflict of interest with respect to this manuscript.
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Ethical approval for the study was obtained from the ethics committee of the First Affiliated Hospital of Wenzhou Medical University. All procedures performed in studies involving human participants were in accordance with the ethical standards of the institutional research committee and with the 1964 Helsinki Declaration and its later amendments.
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Written informed consent was obtained from all participants included in the study.
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Pan, XY., Liu, WY., Zhu, PW. et al. Low skeletal muscle mass is associated with more severe histological features of non-alcoholic fatty liver disease in male. Hepatol Int 16, 1085–1093 (2022). https://doi.org/10.1007/s12072-022-10384-x
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DOI: https://doi.org/10.1007/s12072-022-10384-x