1
|
Thilakarathna WPDW, Rupasinghe HPV. Proanthocyanidins-Based Synbiotics as a Novel Strategy for Nonalcoholic Fatty Liver Disease (NAFLD) Risk Reduction. Molecules 2024; 29:709. [PMID: 38338453 PMCID: PMC10856248 DOI: 10.3390/molecules29030709] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/23/2023] [Revised: 01/29/2024] [Accepted: 02/01/2024] [Indexed: 02/12/2024] Open
Abstract
Nonalcoholic fatty liver disease (NAFLD), the most common liver disease worldwide, is a spectrum of liver abnormalities ranging from steatosis to nonalcoholic steatohepatitis (NASH) characterized by excessive lipid accumulation. The prevalence of NAFLD is predicted to increase rapidly, demanding novel approaches to reduce the global NAFLD burden. Flavonoids, the most abundant dietary polyphenols, can reduce the risk of NAFLD. The majority of dietary flavonoids are proanthocyanidins (PACs), which are oligomers and polymers of the flavonoid sub-group flavan-3-ols. The efficacy of PAC in reducing the NAFLD risk can be significantly hindered by low bioavailability. The development of synbiotics by combining PAC with probiotics may increase effectiveness against NAFLD by biotransforming PAC into bioavailable metabolites. PAC and probiotic bacteria are capable of mitigating steatosis primarily through suppressing de novo lipogenesis and promoting fatty acid β-oxidation. PAC and probiotic bacteria can reduce the progression of steatosis to NASH mainly through ameliorating hepatic damage and inflammation induced by hepatic oxidative stress, endoplasmic reticulum stress, and gut microbiota dysbiosis. Synbiotics of PAC are superior in reducing the risk of NAFLD compared to independent administration of PAC and probiotics. The development of PAC-based synbiotics can be a novel strategy to mitigate the increasing incidence of NAFLD.
Collapse
Affiliation(s)
- Wasitha P. D. W. Thilakarathna
- Department of Plant, Food, and Environmental Sciences, Faculty of Agriculture, Dalhousie University, Truro, NS B2N 5E3, Canada;
| | - H. P. Vasantha Rupasinghe
- Department of Plant, Food, and Environmental Sciences, Faculty of Agriculture, Dalhousie University, Truro, NS B2N 5E3, Canada;
- Department of Pathology, Faculty of Medicine, Dalhousie University, Halifax, NS B3H 4H7, Canada
| |
Collapse
|
2
|
Zamanian MY, Sadeghi Ivraghi M, Khachatryan LG, Vadiyan DE, Bali HY, Golmohammadi M. A review of experimental and clinical studies on the therapeutic effects of pomegranate ( Punica granatum) on non-alcoholic fatty liver disease: Focus on oxidative stress and inflammation. Food Sci Nutr 2023; 11:7485-7503. [PMID: 38107091 PMCID: PMC10724645 DOI: 10.1002/fsn3.3713] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/11/2023] [Revised: 09/06/2023] [Accepted: 09/12/2023] [Indexed: 12/19/2023] Open
Abstract
Non-alcoholic fatty liver disease (NAFLD) is frequently linked to metabolic disorders and is prevalent in obese and diabetic patients. The pathophysiology of NAFLD involves multiple factors, including insulin resistance (IR), oxidative stress (OS), inflammation, and genetic predisposition. Recently, there has been an emphasis on the use of herbal remedies with many people around the world resorting to phytonutrients or nutraceuticals for treatment of numerous health challenges in various national healthcare settings. Pomegranate (Punica granatum) parts, such as juice, peel, seed and flower, have high polyphenol content and is well known for its antioxidant capabilities. Pomegranate polyphenols, such as hydrolyzable tannins, anthocyanins, and flavonoids, have high antioxidant capabilities that can help lower the OS and inflammation associated with NAFLD. The study aimed to investigate whether pomegranate parts could attenuate OS, inflammation, and other risk factors associated with NAFLD, and ultimately prevent the development of the disease. The findings of this study revealed that: 1. pomegranate juice contains hypoglycemic qualities that can assist manage blood sugar levels, which is vital for avoiding and treating NAFLD. 2. Polyphenols from pomegranate flowers increase paraoxonase 1 (PON1) mRNA and protein levels in the liver, which can help protect liver enzymes and prevent NAFLD. 3. Punicalagin (PU) is one of the major ellagitannins found in pomegranate, and PU-enriched pomegranate extract (PE) has been shown to inhibit HFD-induced hyperlipidemia and hepatic lipid deposition in rats. 4. Pomegranate fruit consumption, which is high in antioxidants, can decrease the activity of AST and ALT (markers of liver damage), lower TNF-α (a marker of inflammation), and improve overall antioxidant capacity in NAFLD patients. Overall, the polyphenols in pomegranate extracts have antioxidant, anti-inflammatory, hypoglycemic, and protective effects on liver enzymes, which can help prevent and manage NAFLD effects on liver enzymes, which can help prevent and manage NAFLD.
Collapse
Affiliation(s)
- Mohammad Yassin Zamanian
- Department of Physiology, School of MedicineHamadan University of Medical SciencesHamadanIran
- Department of Pharmacology and Toxicology, School of PharmacyHamadan University of Medical SciencesHamadanIran
| | | | - Lusine G. Khachatryan
- Department of Pediatric Diseases, N.F. Filatov Clinical Institute of Children's HealthI.M. Sechenov First Moscow State Medical University (Sechenov University)MoscowRussia
| | - Diana E. Vadiyan
- Institute of Dentistry, Department of Pediatric, Preventive Dentistry and OrthodonticsI.M. Sechenov First Moscow State Medical University (Sechenov University)MoscowRussia
| | | | | |
Collapse
|
3
|
Clavelo‐Farrow C, Thomas P. The role of candidate transport proteins in β-cell long-chain fatty acid uptake: Where are we now? Diabet Med 2023; 40:e15198. [PMID: 37577762 PMCID: PMC10947460 DOI: 10.1111/dme.15198] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/03/2023] [Revised: 08/04/2023] [Accepted: 08/11/2023] [Indexed: 08/15/2023]
Abstract
Type 2 diabetes (T2D) in humans is typically preceded by elevated levels of circulatory long-chain free fatty acids (LC-FFA). These excess LC-FFA are widely thought to be taken up by pancreatic β-cells, contributing to their dysfunction and death during the development of T2D; a process that has been termed lipotoxicity. Depending on their degree of saturation and carbon chain length, LC-FFA can exert different effects on pancreatic β-cells viability and function in vitro. Long-chain saturated fatty acids (LC-SFA) are thought to be toxic, whereas monounsaturated fatty acids are not and may even offer protection against the toxic effects of LC-SFAs. However, the mechanism of LC-FFA uptake into pancreatic β-cells is poorly understood, partly because it has been an understudied area of research. Determining how LC-FFA are taken up into β-cells is crucial for later formulation of therapies to prevent potential cellular overload of LC-FFA, thereby slowing the onset of T2D. In this work, we detail more than 40 years of literature investigating the role of membrane-associated transport proteins in LC-FFA uptake. By focussing on what is known in other cell types, we highlight where we can extrapolate our current understanding of protein-mediated transport to β-cells and uncover where further understanding is required.
Collapse
Affiliation(s)
| | - Patricia Thomas
- Institute of Metabolism and Systems Research, University of BirminghamBirminghamUK
| |
Collapse
|
4
|
Wang Z, Zou L, Zhang Y, Zhu M, Zhang S, Wu D, Lan J, Zang X, Wang Q, Zhang H, Wu Z, Zhu H, Chen D. ACS-20/FATP4 mediates the anti-ageing effect of dietary restriction in C. elegans. Nat Commun 2023; 14:7683. [PMID: 38001113 PMCID: PMC10673863 DOI: 10.1038/s41467-023-43613-4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/29/2023] [Accepted: 11/15/2023] [Indexed: 11/26/2023] Open
Abstract
Dietary restriction is an effective anti-ageing intervention across species. However, the molecular mechanisms from the metabolic aspects of view are still underexplored. Here we show ACS-20 as a key mediator of dietary restriction on healthy ageing from a genetic screen of the C. elegans acyl-CoA synthetase family. ACS-20 functions in the epidermis during development to regulate dietary restriction-induced longevity. Functional transcriptomics studies reveal that elevated expression of PTR-8/Patched is responsible for the proteostasis and lifespan defects of acs-20. Furthermore, the conserved NHR-23 nuclear receptor serves as a transcriptional repressor of ptr-8 and a key regulator of dietary restriction-induced longevity. Mechanistically, a specific region in the ptr-8 promoter plays a key role in mediating the transcription regulation and lifespan extension under dietary restriction. Altogether, these findings identify a highly conserved lipid metabolism enzyme as a key mediator of dietary restriction-induced lifespan and healthspan extension and reveal the downstream transcriptional regulation mechanisms.
Collapse
Affiliation(s)
- Zi Wang
- Model Animal Research Center of Medical School, MOE Key Laboratory of Model Animals for Disease Study, Nanjing University, Nanjing, Jiangsu, 210061, China
| | - Lina Zou
- Model Animal Research Center of Medical School, MOE Key Laboratory of Model Animals for Disease Study, Nanjing University, Nanjing, Jiangsu, 210061, China
| | - Yiyan Zhang
- Model Animal Research Center of Medical School, MOE Key Laboratory of Model Animals for Disease Study, Nanjing University, Nanjing, Jiangsu, 210061, China
- Zhejiang University-University of Edinburgh Institute, Zhejiang University School of Medicine, Haining, 314400, China
| | - Mengnan Zhu
- School of Life Science and Technology, ShanghaiTech University, Shanghai, 201210, China
| | - Shuxian Zhang
- School of Life Science and Technology, ShanghaiTech University, Shanghai, 201210, China
| | - Di Wu
- Institute of Drug Discovery and Development, Center for Drug Safety Evaluation and Research, Zhengzhou University, Zhengzhou, Henan, 450001, China
| | - Jianfeng Lan
- Affiliated Hospital of Guilin Medical University, Guilin, Guangxi, 541001, China
| | - Xiao Zang
- Model Animal Research Center of Medical School, MOE Key Laboratory of Model Animals for Disease Study, Nanjing University, Nanjing, Jiangsu, 210061, China
- Zhejiang University-University of Edinburgh Institute, Zhejiang University School of Medicine, Haining, 314400, China
| | - Qi Wang
- Model Animal Research Center of Medical School, MOE Key Laboratory of Model Animals for Disease Study, Nanjing University, Nanjing, Jiangsu, 210061, China
- Zhejiang University-University of Edinburgh Institute, Zhejiang University School of Medicine, Haining, 314400, China
| | - Hanxin Zhang
- Model Animal Research Center of Medical School, MOE Key Laboratory of Model Animals for Disease Study, Nanjing University, Nanjing, Jiangsu, 210061, China
| | - Zixing Wu
- Model Animal Research Center of Medical School, MOE Key Laboratory of Model Animals for Disease Study, Nanjing University, Nanjing, Jiangsu, 210061, China
| | - Huanhu Zhu
- School of Life Science and Technology, ShanghaiTech University, Shanghai, 201210, China
| | - Di Chen
- Model Animal Research Center of Medical School, MOE Key Laboratory of Model Animals for Disease Study, Nanjing University, Nanjing, Jiangsu, 210061, China.
- Zhejiang University-University of Edinburgh Institute, Zhejiang University School of Medicine, Haining, 314400, China.
- Department of Colorectal Surgery, The Second Affiliated Hospital, Zhejiang University School of Medicine, Hangzhou, Zhejiang, 310058, China.
| |
Collapse
|
5
|
Zhao Z, Huang J, Zhong D, Wang Y, Che Z, Xu Y, Hong R, Qian Y, Meng Q, Yin J. Associations of three thermogenic adipokines with metabolic syndrome in obese and non-obese populations from the China plateau: the China Multi-Ethnic Cohort. BMJ Open 2023; 13:e066789. [PMID: 37491087 PMCID: PMC10373706 DOI: 10.1136/bmjopen-2022-066789] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 07/27/2023] Open
Abstract
OBJECTIVES High altitude exposure decreases the incidence of obesity and metabolic syndrome, but increases the expression of the thermogenic adipokines (leptin, fat cell fatty acid-binding protein (A-FABP) and visfatin). This study investigated the correlation of these adipokines with obesity and metabolic syndrome (MetS) in populations residing in a plateau-specific environment. DESIGN Case-control study. SETTING We cross-sectionally analysed data from the China Multi-Ethnic Cohort. PARTICIPANTS A total of 475 obese (OB, body mass index (BMI)≥28.0 kg/m2) plateau Han people and 475 age, sex and region-matched non-obese (NO, 18.5≤BMI<24.0 kg/m2) subjects were recruited. MetS was defined according to the National Cholesterol Education Program Adult Treatment Panel III guidelines. PRIMARY AND SECONDARY OUTCOME MEASURES Data with normal distributions were expressed as the mean (Stanard Deviation, SD), and data with skewed distributions were expressed as the median (Interquartile Range, IQR). The participants were grouped and the rank-sum test, χ2 test or t-tests was used for comparing groups. Spearman correlation coefficients were estimated to assess the relationships among leptin, A-FABP, visfatin and the components of MetS in each group. RESULTS A-FABP was an independent predictor of OB (OR, 1.207; 95% CI, 1.170 to 1.245; p<0.05), ABSI (OR, 1.035; 95%CI, 1.019 to 1.052; p<0.05) and MetS (OR, 1.035; 95% CI, 1.013 to 1.057; p<0.05). Leptin was an independent predictor of MetS in the NO group. Visfatin was an independent predictor of increased ABSI, but not for OB or MetS. CONCLUSION An abnormally elevated plasma A-FABP level, but not leptin or visfatin is a potential risk factor for MetS in high-altitude populations.
Collapse
Affiliation(s)
- Zhimin Zhao
- School of Public Health, Kunming Medical University, Kunming, China
| | - Juan Huang
- School of Public Health, Kunming Medical University, Kunming, China
- Ultrasonography Department, First Affiliated Hospital of Kunming Medical University, Kunming, China
| | - Dubo Zhong
- Yunnan Yunce Quality Inspection Limited Company, Kunming, China, Yunnan, Kunming, China
| | - Yanjiao Wang
- School of Public Health, Kunming Medical University, Kunming, China
| | - Zhuohang Che
- School of Public Health, Kunming Medical University, Kunming, China
| | - Yahui Xu
- School of Public Health, Kunming Medical University, Kunming, China
| | | | - Ying Qian
- School of Public Health, Kunming Medical University, Kunming, China
| | - Qiong Meng
- School of Public Health, Kunming Medical University, Kunming, China
| | - Jianzhong Yin
- School of Public Health, Kunming Medical University, Kunming, China
- Baoshan College of Traditional Chinese Medicine, Baoshan, China
| |
Collapse
|
6
|
Yang YH, Wen R, Yang N, Zhang TN, Liu CF. Roles of protein post-translational modifications in glucose and lipid metabolism: mechanisms and perspectives. Mol Med 2023; 29:93. [PMID: 37415097 DOI: 10.1186/s10020-023-00684-9] [Citation(s) in RCA: 7] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/28/2023] [Accepted: 06/10/2023] [Indexed: 07/08/2023] Open
Abstract
The metabolism of glucose and lipids is essential for energy production in the body, and dysregulation of the metabolic pathways of these molecules is implicated in various acute and chronic diseases, such as type 2 diabetes, Alzheimer's disease, atherosclerosis (AS), obesity, tumor, and sepsis. Post-translational modifications (PTMs) of proteins, which involve the addition or removal of covalent functional groups, play a crucial role in regulating protein structure, localization function, and activity. Common PTMs include phosphorylation, acetylation, ubiquitination, methylation, and glycosylation. Emerging evidence indicates that PTMs are significant in modulating glucose and lipid metabolism by modifying key enzymes or proteins. In this review, we summarize the current understanding of the role and regulatory mechanisms of PTMs in glucose and lipid metabolism, with a focus on their involvement in disease progression associated with aberrant metabolism. Furthermore, we discuss the future prospects of PTMs, highlighting their potential for gaining deeper insights into glucose and lipid metabolism and related diseases.
Collapse
Affiliation(s)
- Yu-Hang Yang
- Department of Pediatrics, Shengjing Hospital of China Medical University, No.36, SanHao Street, Liaoning Province, Shenyang City, 110004, China
| | - Ri Wen
- Department of Pediatrics, Shengjing Hospital of China Medical University, No.36, SanHao Street, Liaoning Province, Shenyang City, 110004, China
| | - Ni Yang
- Department of Pediatrics, Shengjing Hospital of China Medical University, No.36, SanHao Street, Liaoning Province, Shenyang City, 110004, China
| | - Tie-Ning Zhang
- Department of Pediatrics, Shengjing Hospital of China Medical University, No.36, SanHao Street, Liaoning Province, Shenyang City, 110004, China.
| | - Chun-Feng Liu
- Department of Pediatrics, Shengjing Hospital of China Medical University, No.36, SanHao Street, Liaoning Province, Shenyang City, 110004, China.
| |
Collapse
|
7
|
Wang C, Mu T, Feng X, Zhang J, Gu Y. Study on fatty acid binding protein in lipid metabolism of livestock and poultry. Res Vet Sci 2023; 158:185-195. [PMID: 37030094 DOI: 10.1016/j.rvsc.2023.03.011] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/23/2022] [Revised: 03/04/2023] [Accepted: 03/13/2023] [Indexed: 03/17/2023]
Abstract
Fatty acid binding proteins (FABPs) are key proteins in lipid transport, and 12 family members have been documented in the literature. In recent years, new insights have been gained into the structure and function of FABPs, which are important regulators of lipid metabolic processes in the body and play a central role in coordinating lipid transport and metabolism in various tissues and organs across species. This paper provides a brief overview of the structure and biological functions of FABPs and reviews related studies on lipid metabolism in livestock and poultry to lay the foundation for research on the mechanism underlying the regulatory effect of FABPs on lipid metabolism in livestock and poultry and for the genetic improvement of livestock and poultry.
Collapse
Affiliation(s)
- Chuanchuan Wang
- School of Agriculture, Ningxia University, 750021, Yinchuan, China
| | - Tong Mu
- School of Agriculture, Ningxia University, 750021, Yinchuan, China
| | - Xiaofang Feng
- School of Agriculture, Ningxia University, 750021, Yinchuan, China
| | - Juan Zhang
- School of Agriculture, Ningxia University, 750021, Yinchuan, China
| | - Yaling Gu
- School of Agriculture, Ningxia University, 750021, Yinchuan, China.
| |
Collapse
|
8
|
Kolieb E, Maher SA, Shalaby MN, Alsuhaibani AM, Alharthi A, Hassan WA, El-Sayed K. Vitamin D and Swimming Exercise Prevent Obesity in Rats under a High-Fat Diet via Targeting FATP4 and TLR4 in the Liver and Adipose Tissue. INTERNATIONAL JOURNAL OF ENVIRONMENTAL RESEARCH AND PUBLIC HEALTH 2022; 19:13740. [PMID: 36360622 PMCID: PMC9656563 DOI: 10.3390/ijerph192113740] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 07/10/2022] [Revised: 10/16/2022] [Accepted: 10/18/2022] [Indexed: 11/05/2022]
Abstract
The prevalence of obesity has risen in the last decades, and it has caused massive health burdens on people's health, especially metabolic and cardiovascular issues. The risk of vitamin D insufficiency is increased by obesity, because adipose tissue alters both the requirements for and bioavailability of vitamin D. Exercise training is acknowledged as having a significant and long-term influence on body weight control; the favorable impact of exercise on obesity and obesity-related co-morbidities has been demonstrated via various mechanisms. The current work illustrated the effects of vitamin D supplementation and exercise on obesity induced by a high-fat diet (HFD) and hepatic steatosis in rats and explored how fatty acid transport protein-4 (FATP4) and Toll-like receptor-4 antibodies (TLR4) might be contributing factors to obesity and related hepatic steatosis. Thirty male albino rats were divided into five groups: group 1 was fed a normal-fat diet, group 2 was fed an HFD, group 3 was fed an HFD and given vitamin D supplementation, group 4 was fed an HFD and kept on exercise, and group 5 was fed an HFD, given vitamin D, and kept on exercise. The serum lipid profile adipokines, interleukin-6 (IL-6), and tumor necrosis factor-alpha (TNF-α) were analyzed, and the pathological changes in adipose and liver tissues were examined. In addition, the messenger-ribonucleic acid (mRNA) expression of FATP4 and immunohistochemical expression of TLR4 in adipose and liver tissues were evaluated. Vitamin D supplementation and exercise improved HFD-induced weight gain and attenuated hepatic steatosis, along with improving the serum lipid profile, degree of inflammation, and serum adipokine levels. The expression of FATP4 and TLR4 in both adipose tissue and the liver was downregulated; it was noteworthy that the group that received vitamin D and was kept on exercise showed also improvement in the histopathological picture of this group. According to the findings of this research, the protective effect of vitamin D and exercise against obesity and HFD-induced hepatic steatosis is associated with the downregulation of FATP4 and TLR4, as well as a reduction in inflammation.
Collapse
Affiliation(s)
- Eman Kolieb
- Medical Physiology Department, Faculty of Medicine, Suez Canal University, Ismailia 41522, Egypt
| | - Shymaa Ahmed Maher
- Medical Biochemistry and Molecular Biology Department, Faculty of Medicine, Suez Canal University, Ismailia 41522, Egypt
- Center of Excellence in Molecular and Cellular Medicine (CEMCM), Faculty of Medicine, Suez Canal University, Ismailia 41522, Egypt
| | - Mohammed Nader Shalaby
- Biological Sciences and Sports Health Department, Faculty of Physical Education, Suez Canal University, Ismailia 41522, Egypt
| | - Amnah Mohammed Alsuhaibani
- Department of Physical Sport Science, College of Education, Princess Nourah bint Abdulrahman University, P.O. Box 84428, Riyadh 11671, Saudi Arabia
| | - Afaf Alharthi
- Department of Clinical Laboratory Sciences, College of Applied Medical Sciences, Taif University, P.O. Box 11099, Taif 21944, Saudi Arabia
| | - Wael A. Hassan
- Department of Pathology, Faculty of Medicine, Suez Canal University, Ismailia 41522, Egypt
- Department of Basic Sciences, College of Medicine, Sulaiman Alrajhi University, Al Bukayriyah 52726, Saudi Arabia
| | - Karima El-Sayed
- Medical Physiology Department, Faculty of Medicine, Suez Canal University, Ismailia 41522, Egypt
| |
Collapse
|
9
|
Chronic Central Leptin Infusion Promotes an Anti-Inflammatory Cytokine Profile Related to the Activation of Insulin Signaling in the Gastrocnemius of Male Rats. Biomedicines 2022; 10:biomedicines10071465. [PMID: 35884769 PMCID: PMC9312815 DOI: 10.3390/biomedicines10071465] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/30/2022] [Revised: 06/17/2022] [Accepted: 06/19/2022] [Indexed: 11/16/2022] Open
Abstract
Leptin is involved in the modulation of insulin signaling in peripheral tissues, being closely associated with changes in lipid metabolism. This adipokine modifies inflammatory pathways that can interact with insulin targets in peripheral organs; however, the mechanisms remain unclear. Inflammatory and insulin signaling targets, cytokines, adiponectin, irisin and non-esterified fatty acid (NEFA) levels and enzymes of fatty acid anabolism were studied in the gastrocnemius of chronic centrally infused leptin (L), pair-fed and control rats. The phosphorylation of signal transducer and activator of transcription 3 (STAT3) and c-Jun N-terminal kinase (JNK) was reduced in L rats (59% and 58%, respectively). The phosphorylation of the insulin receptor and Akt and adiponectin and irisin content was increased in L rats (154%, 157%, 308% and 329%, respectively). The levels of glucose-6-phosphate dehydrogenase, the mRNA content of acetyl Co-A carboxylase and NEFA concentrations were diminished in the muscles of L rats (59%, 50% and 61%, respectively). The activation of JNK correlated positively with STAT3 phosphorylation, tumoral necrosis factor-α and NEFA and negatively with irisin and Akt phosphorylation. These data suggest that the activation of insulin signaling targets and a decrease in NEFA content are associated with a reduction in muscle inflammation parameters, suggesting that leptin may integrate these pathways.
Collapse
|