Abstract
Nonalcoholic fatty liver disease (NAFLD) is one of the most common chronic liver diseases worldwide. In recent years, a new terminology and definition of metabolic dysfunction-associated fatty liver disease (MAFLD) has been proposed. Compared to the NAFLD definition, MAFLD better emphasizes the pathogenic role of metabolic dysfunction in the development and progression of this highly prevalent condition. Metabolic disorders, including overweight/obesity, type 2 diabetes mellitus (T2DM), atherogenic dyslipidemia and hypertension, are often associated with systemic organ dysfunctions, thereby suggesting that multiple organ damage can occur in MAFLD. Substantial epidemiological evidence indicates that MAFLD is not only associated with an increased risk of liver-related complications, but also increases the risk of developing several extra-hepatic diseases, including new-onset T2DM, adverse cardiovascular and renal outcomes, and some common endocrine diseases. We have summarized the current literature on the adverse effect of MAFLD on the development of multiple extrahepatic (cardiometabolic and endocrine) complications and examined the role of different metabolic pathways and organ systems in the progression of MAFLD, thus providing new insights into the role of MAFLD as a multisystem metabolic disorder. Our narrative review aimed to provide insights into potential mechanisms underlying the known associations between MAFLD and extrahepatic diseases, as part of MAFLD as a multisystem disease, in order to help focus areas for future drug development targeting not only liver disease but also the risk of extrahepatic complications.
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Abbreviations
- NAFLD:
-
Non-alcoholic fatty liver disease
- MAFLD:
-
Metabolic dysfunctions associated fatty liver disease
- T2DM:
-
Type 2 diabetes mellitus
- HOMA:
-
Homeostasis model assessment
- NHANES:
-
National Health and Nutrition Examination Survey
- PPAR-α:
-
Peroxisome proliferator activated receptor-alpha
- SREBP-1:
-
Sterol regulatory element-binding protein-1
- MDM2:
-
Murine double minute 2
- TG-VLDL:
-
Triglyceride-very low-density lipoprotein
- apoB:
-
Apolipoprotein B
- CREBH:
-
CAMP response element-binding protein H
- SIRT3:
-
Sirtuin 3
- AdipoR2:
-
Adiponectin receptor 2
- FGF1-IGFBP2:
-
Fibroblast growth factor-insulin-like growth factor binding protein 2
- SGLT2:
-
Sodium-glucose cotransporter 2
- GLP-1:
-
Glucagon-like peptide-1
- GLUT4:
-
Glucose transporter-4
- PI3K/AKT:
-
Phosphatidylinositol 3-kinase/protein kinase B
- AMPK:
-
AMP-activated protein kinase
- GPX4:
-
Glutathione peroxidase 4
- GCDCA:
-
Glycochenodeoxycholate
- TFR/ACSL4:
-
Transferrin receptor/acyl-CoA synthetase long-chain family 4
- TGR5:
-
Takeda G protein-coupled receptor 5
- FXR:
-
Farnesoid X receptor
- mtDNA:
-
Mitochondrial genome
- IRX3:
-
Iroquois homeobox 3
- Grx2a:
-
Glutaredoxin 2a
- NLRP3:
-
NOD-, LRR- and pyrin domain-containing 3
- NKG2D:
-
Monokine induced by interferon-gamma natural killer cell group 2D
- CKD:
-
Chronic kidney disease
- CVD:
-
Cardiovascular disease
- PSVT:
-
Paroxysmal supraventricular tachycardia
- GGT:
-
Gamma-glutamyl transferase
- OSA:
-
Obstructive sleep apnea
- COPD:
-
Chronic obstructive pulmonary disease
- FIB-4:
-
Fibrosis-4
- FVC:
-
Forced vital capacity
- FEV1:
-
Forced expiratory volume in 1 s
- BM:
-
Breast masses
- HDL:
-
High-density lipoprotein
- LDL:
-
Low-density lipoprotein
- PCOS:
-
Polycystic ovary syndrome
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Funding
This work is supported by grants from the National Natural Science Foundation of China (82370577, 82070588, 82000690), National Key R&D Program of China (2023YFA1800801) and supported by China Postdoctoral Science Foundation (2023M732681). Jing Zhao is supported in part by grants from Youth Research Project Fund from Wuxi Municipal Health Commission (Q202212). Dan-Qin Sun is supported in part by grants from Top Talent Support Program for young and middle-aged people of Wuxi Health Committee and scientific technological innovation and venture capital fund in Wuxi (BJ2023023), scientific technological innovation and venture capital fund in Wuxi (Y20232011). GT is supported in part by grants from the School of Medicine, University of Verona, Italy. CDB is supported in part by the Southampton NIHR Biomedical Research Centre (NIHR 203319), UK.
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MHZ, DQS and JZ researched data for the article. JZ wrote the manuscript. LL and YYC drew the schematic map for the manuscript. XG, GT and CDB conducted critical revision and writing of the manuscript. All authors reviewed and commented on the manuscript and approved the final version.
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Zhao, J., Liu, L., Cao, YY. et al. MAFLD as part of systemic metabolic dysregulation. Hepatol Int (2024). https://doi.org/10.1007/s12072-024-10660-y
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DOI: https://doi.org/10.1007/s12072-024-10660-y