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Bellavite P, Fazio S, Affuso F. A Descriptive Review of the Action Mechanisms of Berberine, Quercetin and Silymarin on Insulin Resistance/Hyperinsulinemia and Cardiovascular Prevention. Molecules 2023; 28:4491. [PMID: 37298967 PMCID: PMC10254920 DOI: 10.3390/molecules28114491] [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: 05/16/2023] [Revised: 05/26/2023] [Accepted: 05/30/2023] [Indexed: 06/12/2023] Open
Abstract
Insulin resistance (IR) and the associated hyperinsulinemia are early pathophysiological changes which, if not well treated, can lead to type 2 diabetes, endothelial dysfunction and cardiovascular disease. While diabetes care is fairly well standardized, the prevention and treatment of IR lacks a single pharmaceutical approach and many lifestyle and dietary interventions have been proposed, including a wide range of food supplements. Among the most interesting and well-known natural remedies, alkaloid berberine and the flavonol quercetin have particular relevance in the literature, while silymarin-the active principle of the Silybum marianum thistle-was traditionally used for lipid metabolism disorders and to sustain liver function. This review describes the major defects of insulin signaling leading to IR and the main properties of the three mentioned natural substances, their molecular targets and synergistic action mechanisms. The actions of berberine, quercetin and silymarin are partially superimposable as remedies against reactive oxygen intermediates generated by a high-lipid diet and by NADPH oxidase, which is triggered by phagocyte activation. Furthermore, these compounds inhibit the secretion of a battery of pro-inflammatory cytokines, modulate intestinal microbiota and are especially able to control the various disorders of the insulin receptor and post-receptor signaling systems. Although most of the evidence on the effects of berberine, quercetin and silymarin in modulating insulin resistance and preventing cardiovascular disease derive from experimental studies on animals, the amount of pre-clinical knowledge strongly suggests the need to investigate the therapeutic potential of these substances in human pathology.
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Affiliation(s)
- Paolo Bellavite
- Pathophysiology Chair, Homeopathic Medical School of Verona, 37121 Verona, Italy
| | - Serafino Fazio
- Department of Internal Medicine, University of Naples Federico II, 80138 Naples, Italy;
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Li C, Su Z, Chen Z, Cao J, Liu X, Xu F. Lactobacillus reuteri strain 8008 attenuated the aggravation of depressive-like behavior induced by CUMS in high-fat diet-fed mice through regulating the gut microbiota. Front Pharmacol 2023; 14:1149185. [PMID: 37050901 PMCID: PMC10083334 DOI: 10.3389/fphar.2023.1149185] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/21/2023] [Accepted: 03/20/2023] [Indexed: 03/28/2023] Open
Abstract
Objective: Gut microbiota play a key role in the pathogenesis of obesity and depression. Probiotics are a preventive strategy for obesity and a novel treatment for depression symptoms. However, the ameliorative or therapeutic effect of potential probiotic candidate Lactobacillus reuteri (L. reuteri) on obesity and depression comorbidity still remains unclear. We investigated the effects of chronic unpredictable mild stress (CUMS) in high-fat diet-fed mice and the effects of Lactobacillus reuteri strain 8008 on various disease indicators of obesity and depression comorbidity disease. Methods: Forty male C57BL/6 mice were randomized into 2 groups: the normal control (NC) group (n = 10) and the high-fat diet (HFD) group (n = 30), being fed with normal diet (ND) or high-fat diet (HFD) for 8 weeks, respectively. Then the obese mice fed with HFD were randomly allocated into 3 sub-groups: the HFD group (n = 10); the HFD + CUMS group (n = 10); the HFD + CUMS + L.r group (n = 10). The latter 2 subgroups underwent CUMS for 4 weeks to build the obesity and depression comorbidity mice model. During the duration of treatment, mice were gavaged with 0.5 mL PBS solution or L. reuteri (2 × 109 CFU/mL) once a day, respectively. The body weight, food intake, organ weight, behavioral indicators, histology, blood lipids, levels of inflammatory cytokines and tight junction proteins and abundance of colonic contents bacteria were measured. Results: The obesity and depression comorbidity mice model was successfully established after HFD feeding and chronic stress. The comorbid mice demonstrated inflammatory responses increase in liver and adipose tissues, worsened damage to the intestinal barrier as well as gut microbiota disorder. Gavaged with L. reuteri attenuated depressive-like behavior, improved blood lipids and insulin resistance, reduced inflammation in liver and adipose tissues, improved intestinal tight junctions as well as the microbiome dysbiosis in obesity and depression comorbidity mice. Conclusion: Lactobacillus reuteri strain 8008 could alleviate depressive-like behaviors and related indicators of obesity disorders by regulating the gut microbiota in obesity and depression comorbid mice.
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Affiliation(s)
- Canye Li
- Fengxian Hospital, Southern Medical University, Shanghai, China
| | - Zuanjun Su
- Fengxian Hospital, Southern Medical University, Shanghai, China
| | - Zhicong Chen
- Fengxian Hospital, Southern Medical University, Shanghai, China
| | - Jinming Cao
- Fengxian Hospital, Southern Medical University, Shanghai, China
| | - Xiufeng Liu
- Sixth People’s Hospital South Campus, Shanghai Jiaotong University, Shanghai, China
| | - Feng Xu
- Fengxian Hospital, Southern Medical University, Shanghai, China
- Sixth People’s Hospital South Campus, Shanghai Jiaotong University, Shanghai, China
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Adzuki Bean MY59 Extract Reduces Insulin Resistance and Hepatic Steatosis in High-Fat-Fed Mice via the Downregulation of Lipocalin-2. Nutrients 2022; 14:nu14235049. [PMID: 36501079 PMCID: PMC9739659 DOI: 10.3390/nu14235049] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/11/2022] [Revised: 11/25/2022] [Accepted: 11/25/2022] [Indexed: 11/29/2022] Open
Abstract
Adzuki bean is well known as a potential functional food that improves metabolic complications from obesity and diabetes. Lipocalin-2 (LCN2) has been implicated to have an important role in obesity and diabetes. However, the protective roles of adzuki bean MY59 extract (ABE) on insulin resistance and hepatic steatosis are not fully understood. In the present study, we investigated the effects of ABE on LCN2 expression in high-fat diet (HFD)-fed mice. ABE reduced HFD-induced fat mass and improved insulin resistance. In addition to hepatic steatosis, HFD-fed mice showed many apoptotic cells and neutrophils in the epididymal fat pads. However, these findings were significantly reduced by ABE supplementation. In particular, we found that increased LCN2 proteins from serum, epididymal fat pads, and liver in HFD-fed mice are significantly reduced by ABE. Furthermore, ABE reduced increased heme oxygenase-1 and superoxide dismutase-1 expressions in adipose tissue and liver in HFD-fed mice. We found that hepatic nuclear factor-kappa B (NF-κB) p65 expression in HFD-fed mice was also reduced by ABE. Thus, these findings indicate that ABE feeding could improve insulin resistance and hepatic steatosis by decreasing LCN2-mediated inflammation and oxidative stress in HFD-fed mice.
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Preparation, physicochemical characterization, and bioactivity evaluation of berberine-entrapped albumin nanoparticles. Sci Rep 2022; 12:17431. [PMID: 36261663 PMCID: PMC9581884 DOI: 10.1038/s41598-022-21568-8] [Citation(s) in RCA: 7] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/26/2022] [Accepted: 09/28/2022] [Indexed: 01/12/2023] Open
Abstract
Berberine (BBR) is an isoquinoline alkaloid with several clinical therapeutic applications. Its low water solubility, absorption, and cellular bioavailability diminish BBR's therapeutic efficacy. In this study, BBR was encapsulated into bovine serum albumin nanoparticles (BSA NPs) core to reduce BBR limitations and enhance its clinical therapeutic properties. Several physicochemical characterization tools, such as Dynamic Light Scattering and Ultraviolet-Visible spectroscopic measurements, field emission transmission electron microscopy surface morphology, Fourier transforms infrared spectroscopy, thermal stability analysis, and releasing studies, were used to evaluate the BBR-BSA NPs. Compared to BBR, BBR-BSA nanoparticles demonstrated superior free radical scavenging and antioxidant capacities, anti-hemolytic and anticoagulant efficacies, and antimicrobial activities, as demonstrated by the findings of the in vitro studies. Furthermore, a stressed pancreatic rat model was induced using a high-fat, high-sucrose diet plus carbon tetrachloride injection. The in vivo results revealed that BBR-BSA NPs substantially restored peripheral glucose metabolism and insulin sensitivity. Oral administration of BBR-BSA NPs also improved pancreatic β-cells homeostasis, upregulated pancreatic antioxidant mechanisms, inhibited oxidants generation, and attenuated oxidative injury in the stressed pancreatic tissues. In conclusion, our in vitro and in vivo results confirmed that BBR-BSA NPs demonstrated more potent antioxidant properties and restored pancreatic homeostasis compared to BBR.
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Nguyen TMH, Le TPQ, Hoang VV, Nhu DL, Ha HTT. Fecal indicator bacteria diversity and decay in an estuarine mangrove ecosystem of the Xuan Thuy National Park, Vietnam. JOURNAL OF WATER AND HEALTH 2022; 20:915-926. [PMID: 35768967 DOI: 10.2166/wh.2022.310] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/15/2023]
Abstract
Mangroves are complex and dynamic ecosystems that are highly dependent on diverse microbial activities. In this study, laboratory experiments and field studies for fecal indicator bacteria (FIB) decay rates are carried out for the first time in the Xuan Thuy Mangrove Forest Reserve of Vietnam. Results show that there are significant differences in bacterial diversity in the water of mangrove areas that have been deforested compared to those which have been planted. The highest mean total coliform (TC) and Escherichia coli (EC) values were found in the natural mangroves (3,807±2,922 and 964±1133 CFU 100 ml-1, respectively). The results indicated that the source of contamination and seasonal changes affect the abundance of fecal bacteria. These results were exceeding by far the safety guidelines for individual, non-commercial water supplies in most of the samples. In the planted mangrove sampling sites, the highest mean Fecal streptococci (FS) values of 1,520±1,652 CFU 100 ml-1 were found. Microbial die-off rates were calculated over 5 days, and observed to be systematically higher for TC than for EC.
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Affiliation(s)
- Thi Mai Huong Nguyen
- Institute of Natural Product Chemistry, Vietnam Academy of Science and Technology, 18 Hoang Quoc Viet Road, Cau Giay, Hanoi, Vietnam E-mail:
| | - Thi Phuong Quynh Le
- Institute of Natural Product Chemistry, Vietnam Academy of Science and Technology, 18 Hoang Quoc Viet Road, Cau Giay, Hanoi, Vietnam E-mail:
| | - Vinh Van Hoang
- VNU Institute of Microbiology and Biotechnology, Vietnam National University, Hanoi, Vietnam
| | - Da Le Nhu
- Institute of Natural Product Chemistry, Vietnam Academy of Science and Technology, 18 Hoang Quoc Viet Road, Cau Giay, Hanoi, Vietnam E-mail:
| | - Hoang Thi Thu Ha
- Institute of Natural Product Chemistry, Vietnam Academy of Science and Technology, 18 Hoang Quoc Viet Road, Cau Giay, Hanoi, Vietnam E-mail:
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Su YL, Liu D, Liu YJ, Ji YL, Liu GS, Wang JLT, Wang B, Wang H. Phlorizin alleviates cholinergic memory impairment and regulates gut microbiota in d-galactose induced mice. Exp Gerontol 2022; 165:111863. [PMID: 35660419 DOI: 10.1016/j.exger.2022.111863] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/18/2021] [Revised: 04/24/2022] [Accepted: 05/28/2022] [Indexed: 02/06/2023]
Abstract
We explored the effect of phlorizin against cholinergic memory impairment and dysbacteriosis in D-galactose induced ICR mice. The control (CON) group, D-galactose model (DGM) group, and three groups (DG-PL, DG-PM, DG-PH) treated with phlorizin at 0.01%, 0.02%, and 0.04% (w/w) in diets were raised for 12 weeks. Supplementing with phlorizin reversed the loss of organ coefficient and body weight caused by D-galactose. The functional abilities of phlorizin on hippocampal-dependent spatial learning and memory, anti-oxidation, anti-inflammation were also observed. Meanwhile, phlorizin intervention upregulated the gene expression of Nrf2, GSH-PX, SOD1, decreased the gene expression of NF-κB, TLR-4, TNF-α, and IL-1β in the hippocampus, while enhanced the gene expression of JAM-A, Mucin2, Occludin in the caecum. Furthermore, a neurotransmitter of acetylcholine (ACh) was enhanced, while acetylcholinesterase (AChE) activity was inhibited by phlorizin administration. Moreover, phlorizin administration increased short-chain fatty acids (SCFAs) content, and reduced lipopolysaccharides (LPS) levels, which may relate to the rebuilding of gut microbiota homeostasis. Treatment with phlorizin may be an effective intervention for alleviating cognitive decline and gut microbiota dysbiosis.
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Affiliation(s)
- Yan-Ling Su
- Department of Biological Science and Technology, Jinzhong University, Jinzhong 030619, China; State Key Laboratory of Food Nutrition and Safety, College of Food Science and Engineering, Tianjin University of Science & Technology, Tianjin 300457, China
| | - Dong Liu
- State Key Laboratory of Food Nutrition and Safety, College of Food Science and Engineering, Tianjin University of Science & Technology, Tianjin 300457, China; Jiangsu Key Laboratory of Preventive and Translational Medicine for Geriatric Disease, Department of Nutrition and Food Hygiene, School of Public Health, Medical College of Soochow University, Suzhou 215123, China
| | - Yao-Jie Liu
- State Key Laboratory of Food Nutrition and Safety, College of Food Science and Engineering, Tianjin University of Science & Technology, Tianjin 300457, China
| | - Yang-Lin Ji
- State Key Laboratory of Food Nutrition and Safety, College of Food Science and Engineering, Tianjin University of Science & Technology, Tianjin 300457, China
| | - Gui-Shan Liu
- School of Food & Wine, Ningxia University, Yinchuan 750021, China
| | - Ji-Li-Te Wang
- Department of Agriculture, Hetao College, Inner Mongolia, Bayannur 015000, China
| | - Biao Wang
- College of Chemical Engineering and Material Science, Tianjin University of Science and Technology, Tianjin 300457, China.
| | - Hao Wang
- State Key Laboratory of Food Nutrition and Safety, College of Food Science and Engineering, Tianjin University of Science & Technology, Tianjin 300457, China.
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Liu H, Zhang Z, Li J, Liu W, Warda M, Cui B, Abd El-Aty AM. Oligosaccharides derived from Lycium barbarum ameliorate glycolipid metabolism and modulate the gut microbiota community and the faecal metabolites in a type 2 diabetes mouse model: metabolomic bioinformatic analysis. Food Funct 2022; 13:5416-5429. [PMID: 35475434 DOI: 10.1039/d1fo02667d] [Citation(s) in RCA: 9] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
Herein, we assessed the effects of Lycium barbarum oligosaccharides (LBO) on the intestinal microenvironment of a type 2 diabetes (T2D) mouse model through gut microbiome and metabolomics analysis. We set high (300 mg kg-1), medium (200 mg kg-1), and low (100 mg kg-1) doses of LBO for intervention once a day for 4 weeks. The results showed that the intervention effect of the medium-dose group was the most significant. It reduced the symptoms of hyperglycemia, inflammation, insulin resistance, and lipid accumulation in the T2D mouse model. It restored the structure of damaged tissues and cells, such as the pancreas, liver, and kidneys. LBO increased the relative abundance of beneficial bacteria, such as Lactobacillus, Bacteroides, Prevotella, and Akkermansia, and maintained intestinal barrier integrity. The faecal metabolic map showed that the contents of glycogen amino acids, such as proline, serine, and leucine, increased. The contents of cholic, capric, and dodecanoic acid decreased. In summary, we may suggest that LBO can be used as a prebiotic for treating T2D.
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Affiliation(s)
- Hao Liu
- State Key Laboratory of Biobased Material and Green Papermaking, Qilu University of Technology, Shandong Academy of Sciences, Jinan, 250353, China. .,School of Food Science and Engineering, Qilu University of Technology, Shandong Academy of Sciences, Jinan, Shandong, 250353, China
| | - Zheng Zhang
- State Key Laboratory of Biobased Material and Green Papermaking, Qilu University of Technology, Shandong Academy of Sciences, Jinan, 250353, China. .,School of Food Science and Engineering, Qilu University of Technology, Shandong Academy of Sciences, Jinan, Shandong, 250353, China
| | - Jianpeng Li
- State Key Laboratory of Biobased Material and Green Papermaking, Qilu University of Technology, Shandong Academy of Sciences, Jinan, 250353, China. .,School of Food Science and Engineering, Qilu University of Technology, Shandong Academy of Sciences, Jinan, Shandong, 250353, China
| | - Wei Liu
- Yucheng People's Hospital, Dezhou, 251200, China
| | - Mohamad Warda
- Department of Biochemistry and Molecular Biology, Faculty of Veterinary Medicine, Cairo University, Giza-12211, Egypt
| | - Bo Cui
- State Key Laboratory of Biobased Material and Green Papermaking, Qilu University of Technology, Shandong Academy of Sciences, Jinan, 250353, China. .,School of Food Science and Engineering, Qilu University of Technology, Shandong Academy of Sciences, Jinan, Shandong, 250353, China
| | - A M Abd El-Aty
- State Key Laboratory of Biobased Material and Green Papermaking, Qilu University of Technology, Shandong Academy of Sciences, Jinan, 250353, China. .,Department of Pharmacology, Faculty of Veterinary Medicine, Cairo University, Giza-12211, Egypt.,Department of Medical Pharmacology, Medical Faculty, Ataturk University, Erzurum 25240, Turkey
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Smoak P, Burke SJ, Collier JJ. Botanical Interventions to Improve Glucose Control and Options for Diabetes Therapy. SN COMPREHENSIVE CLINICAL MEDICINE 2021; 3:2465-2491. [PMID: 35098034 PMCID: PMC8796700 DOI: 10.1007/s42399-021-01034-8] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 01/16/2023]
Abstract
Diabetes mellitus is a major public health problem worldwide. This endocrine disease is clustered into distinct subtypes based on the route of development, with the most common forms associated with either autoimmunity (T1DM) or obesity (T2DM). A shared hallmark of both major forms of diabetes is a reduction in function (insulin secretion) or mass (cell number) of the pancreatic islet beta-cell. Diminutions in both mass and function are often present. A wide assortment of plants have been used historically to reduce the pathological features associated with diabetes. In this review, we provide an organized viewpoint focused around the phytochemicals and herbal extracts investigated using various preclinical and clinical study designs. In some cases, crude extracts were examined directly, and in others, purified compounds were explored for their possible therapeutic efficacy. A subset of these studies compared the botanical product with standard of care prescribed drugs. Finally, we note that botanical formulations are likely suspects for future drug discovery and refinement into class(es) of compounds that have either direct or adjuvant therapeutic benefit.
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Affiliation(s)
- Peter Smoak
- Laboratory of Islet Biology and Inflammation, Pennington Biomedical Research Center, Louisiana State University System, 6400 Perkins Road, Baton Rouge, LA 70808, USA
| | - Susan J. Burke
- Immunogenetics Laboratory, Pennington Biomedical Research Center, Louisiana State University System, 6400 Perkins Road, LA 70808 Baton Rouge, USA
| | - J. Jason Collier
- Laboratory of Islet Biology and Inflammation, Pennington Biomedical Research Center, Louisiana State University System, 6400 Perkins Road, Baton Rouge, LA 70808, USA
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Zhao MM, Lu J, Li S, Wang H, Cao X, Li Q, Shi TT, Matsunaga K, Chen C, Huang H, Izumi T, Yang JK. Berberine is an insulin secretagogue targeting the KCNH6 potassium channel. Nat Commun 2021; 12:5616. [PMID: 34556670 PMCID: PMC8460738 DOI: 10.1038/s41467-021-25952-2] [Citation(s) in RCA: 40] [Impact Index Per Article: 13.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/28/2020] [Accepted: 09/08/2021] [Indexed: 11/09/2022] Open
Abstract
Coptis chinensis is an ancient Chinese herb treating diabetes in China for thousands of years. However, its underlying mechanism remains poorly understood. Here, we report the effects of its main active component, berberine (BBR), on stimulating insulin secretion. In mice with hyperglycemia induced by a high-fat diet, BBR significantly increases insulin secretion and reduced blood glucose levels. However, in mice with hyperglycemia induced by global or pancreatic islet β-cell-specific Kcnh6 knockout, BBR does not exert beneficial effects. BBR directly binds KCNH6 potassium channels, significantly accelerates channel closure, and subsequently reduces KCNH6 currents. Consequently, blocking KCNH6 currents prolongs high glucose-dependent cell membrane depolarization and increases insulin secretion. Finally, to assess the effect of BBR on insulin secretion in humans, a randomized, double-blind, placebo-controlled, two-period crossover, single-dose, phase 1 clinical trial (NCT03972215) including 15 healthy men receiving a 160-min hyperglycemic clamp experiment is performed. The pre-specified primary outcomes are assessment of the differences of serum insulin and C-peptide levels between BBR and placebo treatment groups during the hyperglycemic clamp study. BBR significantly promotes insulin secretion under hyperglycemic state comparing with placebo treatment, while does not affect basal insulin secretion in humans. All subjects tolerate BBR well, and we observe no side effects in the 14-day follow up period. In this study, we identify BBR as a glucose-dependent insulin secretagogue for treating diabetes without causing hypoglycemia that targets KCNH6 channels.
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Affiliation(s)
- Miao-Miao Zhao
- Department of Endocrinology, Beijing Tongren Hospital, Capital Medical University, 100730, Beijing, China
- Beijing Key Laboratory of Diabetes Research and Care, Beijing Diabetes Institute, 100730, Beijing, China
| | - Jing Lu
- Department of Endocrinology, Beijing Tongren Hospital, Capital Medical University, 100730, Beijing, China
- Beijing Key Laboratory of Diabetes Research and Care, Beijing Diabetes Institute, 100730, Beijing, China
| | - Sen Li
- Beijing Key Laboratory of Diabetes Research and Care, Beijing Diabetes Institute, 100730, Beijing, China
| | - Hao Wang
- Department of Endocrinology, Beijing Tongren Hospital, Capital Medical University, 100730, Beijing, China
- Beijing Key Laboratory of Diabetes Research and Care, Beijing Diabetes Institute, 100730, Beijing, China
- Laboratory of Molecular Endocrinology and Metabolism, Department of Molecular Medicine, Institute for Molecular and Cellular Regulation, Gunma University, Maebashi, Japan
| | - Xi Cao
- Department of Endocrinology, Beijing Tongren Hospital, Capital Medical University, 100730, Beijing, China
- Beijing Key Laboratory of Diabetes Research and Care, Beijing Diabetes Institute, 100730, Beijing, China
| | - Qi Li
- Beijing Key Laboratory of Diabetes Research and Care, Beijing Diabetes Institute, 100730, Beijing, China
| | - Ting-Ting Shi
- Department of Endocrinology, Beijing Tongren Hospital, Capital Medical University, 100730, Beijing, China
- Beijing Key Laboratory of Diabetes Research and Care, Beijing Diabetes Institute, 100730, Beijing, China
| | - Kohichi Matsunaga
- Laboratory of Molecular Endocrinology and Metabolism, Department of Molecular Medicine, Institute for Molecular and Cellular Regulation, Gunma University, Maebashi, Japan
| | - Chen Chen
- School of Biomedical Sciences, University of Queensland, Brisbane, QLD, 4072, Australia
| | - Haixia Huang
- Department of Physiology and Pathophysiology, School of Basic Medical Sciences, Capital Medical University, 100069, Beijing, China
| | - Tetsuro Izumi
- Laboratory of Molecular Endocrinology and Metabolism, Department of Molecular Medicine, Institute for Molecular and Cellular Regulation, Gunma University, Maebashi, Japan
| | - Jin-Kui Yang
- Department of Endocrinology, Beijing Tongren Hospital, Capital Medical University, 100730, Beijing, China.
- Beijing Key Laboratory of Diabetes Research and Care, Beijing Diabetes Institute, 100730, Beijing, China.
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Zhao Q, Hou D, Fu Y, Xue Y, Guan X, Shen Q. Adzuki Bean Alleviates Obesity and Insulin Resistance Induced by a High-Fat Diet and Modulates Gut Microbiota in Mice. Nutrients 2021; 13:nu13093240. [PMID: 34579118 PMCID: PMC8466346 DOI: 10.3390/nu13093240] [Citation(s) in RCA: 49] [Impact Index Per Article: 16.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/26/2021] [Revised: 09/11/2021] [Accepted: 09/14/2021] [Indexed: 12/23/2022] Open
Abstract
Adzuki bean consumption has many health benefits, but its effects on obesity and regulating gut microbiota imbalances induced by a high-fat diet (HFD) have not been thoroughly studied. Mice were fed a low-fat diet, a HFD, and a HFD supplemented with 15% adzuki bean (HFD-AB) for 12 weeks. Adzuki bean supplementation significantly reduced obesity, lipid accumulation, and serum lipid and lipopolysaccharide (LPS) levels induced by HFD. It also mitigated liver function damage and hepatic steatosis. In particular, adzuki bean supplementation improved glucose homeostasis by increasing insulin sensitivity. In addition, it significantly reversed HFD-induced gut microbiota imbalances. Adzuki bean significantly reduced the ratio of Firmicutes/Bacteroidetes (F/B); enriched the occurrence of Bifidobacterium, Prevotellaceae, Ruminococcus_1, norank_f_Muribaculaceae, Alloprevotella, Muribaculum, Turicibacter, Lachnospiraceae_NK4A136_group, and Lachnoclostridium; and returned HFD-dependent taxa (Desulfovibrionaceae, Bilophila, Ruminiclostridium_9, Blautia, and Ruminiclostridium) back to normal status. PICRUSt2 analysis showed that the changes in gut microbiota induced by adzuki bean supplementation may be associated with the metabolism of carbohydrates, lipids, sulfur, and cysteine and methionine; and LPS biosynthesis; and valine, leucine, and isoleucine degradation.
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Affiliation(s)
- Qingyu Zhao
- College of Food Science and Nutritional Engineering, China Agricultural University, Beijing 100083, China; (Q.Z.); (D.H.); (Y.F.); (Y.X.)
- National Center of Technology Innovation (Deep Processing of Highland Barley) in Food Industry, Beijing 100083, China
- National Engineering Research Center for Fruit and Vegetable Processing, Beijing 100083, China
- Key Laboratory of Plant Protein and Grain Processing, Beijing 100083, China
| | - Dianzhi Hou
- College of Food Science and Nutritional Engineering, China Agricultural University, Beijing 100083, China; (Q.Z.); (D.H.); (Y.F.); (Y.X.)
- National Center of Technology Innovation (Deep Processing of Highland Barley) in Food Industry, Beijing 100083, China
- National Engineering Research Center for Fruit and Vegetable Processing, Beijing 100083, China
- Key Laboratory of Plant Protein and Grain Processing, Beijing 100083, China
| | - Yongxia Fu
- College of Food Science and Nutritional Engineering, China Agricultural University, Beijing 100083, China; (Q.Z.); (D.H.); (Y.F.); (Y.X.)
- National Center of Technology Innovation (Deep Processing of Highland Barley) in Food Industry, Beijing 100083, China
- National Engineering Research Center for Fruit and Vegetable Processing, Beijing 100083, China
- Key Laboratory of Plant Protein and Grain Processing, Beijing 100083, China
| | - Yong Xue
- College of Food Science and Nutritional Engineering, China Agricultural University, Beijing 100083, China; (Q.Z.); (D.H.); (Y.F.); (Y.X.)
- National Center of Technology Innovation (Deep Processing of Highland Barley) in Food Industry, Beijing 100083, China
- National Engineering Research Center for Fruit and Vegetable Processing, Beijing 100083, China
- Key Laboratory of Plant Protein and Grain Processing, Beijing 100083, China
| | - Xiao Guan
- School of Medical Instrument and Food Engineering, University of Shanghai for Science and Technology, Shanghai 200093, China;
| | - Qun Shen
- College of Food Science and Nutritional Engineering, China Agricultural University, Beijing 100083, China; (Q.Z.); (D.H.); (Y.F.); (Y.X.)
- National Center of Technology Innovation (Deep Processing of Highland Barley) in Food Industry, Beijing 100083, China
- National Engineering Research Center for Fruit and Vegetable Processing, Beijing 100083, China
- Key Laboratory of Plant Protein and Grain Processing, Beijing 100083, China
- Correspondence: ; Tel.: +86-010-6273-7524
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Berberine Reshapes the Balance of the Local Renin-Angiotensin System by Modulating Autophagy under Metabolic Stress in Pancreatic Islets. J Renin Angiotensin Aldosterone Syst 2021; 2021:9928986. [PMID: 34394712 PMCID: PMC8356011 DOI: 10.1155/2021/9928986] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/27/2021] [Accepted: 04/09/2021] [Indexed: 01/22/2023] Open
Abstract
Results Prolonged exposure to palmitate increased the expression of ACE and AngII type 1 receptor (ATR1) and decreased the ACE2 expression, which was partly offset by berberine. In ob/ob mice, berberine increased in tolerance to glucose, improved abnormal β-cell and α-cell distributions, upregulated ACE2 expression, and decreased autophagosomes and the expression of LC3 and SQSTM1/p62. Autophagosomes and expression of LC3 and SQSTM1/p62 were increased in ACE2KO mice. Conclusions We demonstrated that berberine may improve the pancreatic islet function by regulating local RAS-mediated autophagy under metabolic stress.
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Cole LK, Zhang M, Chen L, Sparagna GC, Vandel M, Xiang B, Dolinsky VW, Hatch GM. Supplemental Berberine in a High-Fat Diet Reduces Adiposity and Cardiac Dysfunction in Offspring of Mouse Dams with Gestational Diabetes Mellitus. J Nutr 2021; 151:892-901. [PMID: 33484149 DOI: 10.1093/jn/nxaa408] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/23/2020] [Revised: 11/18/2020] [Accepted: 11/23/2020] [Indexed: 12/13/2022] Open
Abstract
BACKGROUND There are few evidence-based strategies to attenuate the risk of metabolic syndrome in offspring exposed to gestational diabetes mellitus (GDM). Berberine (BBR) is an isoquinoline alkaloid extracted from Chinese herbs and exhibits glucose lowering properties. OBJECTIVES We hypothesized that dietary BBR would improve health outcomes in the mouse offspring of GDM dams. METHODS Wild-type C57BL/6 female mice were fed either a Lean-inducing low-fat diet (L-LF,10% kcal fat, 35% kcal sucrose) or a GDM-inducing high-fat diet (GDM-HF, 45% kcal fat, 17.5% sucrose) for 6 wk prior to breeding with wild-type C57BL/6 male mice throughout pregnancy and the suckling period. The resulting Lean and GDM-exposed male and female offspring were randomly assigned an LF (10% kcal fat, 35% kcal sucrose), HF (45% kcal fat, 17.5% sucrose), or high-fat berberine (HFB) (45% kcal fat, 17.5% sucrose diet) containing BBR (160 mg/kg/d, HFB) at weaning for 12 wk. The main outcome was to evaluate the effects of BBR on obesity, pancreatic islet function, and cardiac contractility in GDM-exposed HF-fed offspring. Significance between measurements was determined using a 2 (gestational exposure) × 3 (diet) factorial design by a 2- way ANOVA using Tukey post-hoc analysis. RESULTS In the GDM-HF group, body weights were significantly increased (16%) compared with those in baseline (L-LF) animals (P < 0.05). Compared with the L-LF animals, the GDM-HF group had a reduction in pancreatic insulin glucose-stimulated insulin secretion (74%) and increased cardiac isovolumetric contraction time (IVCT; ∼150%) (P < 0.05). Compared with GDM-HF animals, the GDM-HFB group with the dietary addition of BBR had significantly reduced body weight (16%), increased glucose-stimulated insulin secretion from pancreatic islets (254%), and reduced systolic heart function (46% IVCT) (P < 0.05). CONCLUSIONS In a mouse model of GDM, dietary BBR treatment provided protection from obesity and the development of pancreatic islet and cardiac dysfunction.
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Affiliation(s)
- Laura K Cole
- Diabetes Research Envisioned and Accomplished in Manitoba (DREAM) Theme, Children's Hospital Research Institute of Manitoba, Department of Pharmacology and Therapeutics, Faculty of Health Sciences, University of Manitoba, Winnipeg, Canada
| | - Ming Zhang
- Department of Pharmacology, College of Basic Medical Sciences, School of Nursing, Jilin University, Changchun, China
| | - Li Chen
- Department of Pharmacology, College of Basic Medical Sciences, School of Nursing, Jilin University, Changchun, China
| | - Genevieve C Sparagna
- Department of Medicine, Division of Cardiology, University of Colorado Anschutz Medical Center, Aurora, USA
| | - Marilyne Vandel
- Diabetes Research Envisioned and Accomplished in Manitoba (DREAM) Theme, Children's Hospital Research Institute of Manitoba, Department of Pharmacology and Therapeutics, Faculty of Health Sciences, University of Manitoba, Winnipeg, Canada
| | - Bo Xiang
- Diabetes Research Envisioned and Accomplished in Manitoba (DREAM) Theme, Children's Hospital Research Institute of Manitoba, Department of Pharmacology and Therapeutics, Faculty of Health Sciences, University of Manitoba, Winnipeg, Canada
| | - Vernon W Dolinsky
- Diabetes Research Envisioned and Accomplished in Manitoba (DREAM) Theme, Children's Hospital Research Institute of Manitoba, Department of Pharmacology and Therapeutics, Faculty of Health Sciences, University of Manitoba, Winnipeg, Canada
| | - Grant M Hatch
- Diabetes Research Envisioned and Accomplished in Manitoba (DREAM) Theme, Children's Hospital Research Institute of Manitoba, Department of Pharmacology and Therapeutics, Faculty of Health Sciences, University of Manitoba, Winnipeg, Canada.,Center for Research and Treatment of Atherosclerosis, University of Manitoba, Winnipeg, Canada
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13
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Liu D, Ji Y, Guo Y, Wang H, Wu Z, Li H, Wang H. Dietary Supplementation of Apple Phlorizin Attenuates the Redox State Related to Gut Microbiota Homeostasis in C57BL/6J Mice Fed with a High-Fat Diet. JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY 2021; 69:198-211. [PMID: 33350821 DOI: 10.1021/acs.jafc.0c06426] [Citation(s) in RCA: 21] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/12/2023]
Abstract
We explored the effects of dietary supplementation with phlorizin on redox state-related gut microbiota homeostasis in an obesity mouse model. Mice (C57BL/6J) were grouped as follows for 12 weeks: normal chow diet group (NCD), high-fat and cholesterol diet group (HFD), and treatment groups fed with HFD along with three levels of phlorizin. Phlorizin alleviated the hyperlipidemia and redox status and increased the total ccal SCFA content (1.88 ± 0.25 mg/g). Additionally, phlorizin regulated gene expression related to lipid metabolism, redox status, and cecum barrier and rebuilt gut microbiota homeostasis. After interference by antibiotics, the total phloretin content in the feces was decreased about 4-fold, and most of the health-promoting effects were abolished, indicating that phlorizin might be susceptible to microbial biotransformation and that microecology is indispensable for maintaining the redox state capacities of phlorizin. Phlorizin treatment could be an advantageous option for improving HFD-related obesity and redox states related to gut microbiota homeostasis.
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Affiliation(s)
- Dong Liu
- State Key Laboratory of Food Nutrition and Safety, Tianjin University of Science & Technology, Tianjin 300457, China
- Jiangsu Key Laboratory of Preventive and Translational Medicine for Geriatric Disease, Department of Nutrition and Food Hygiene, School of Public Health, Medical College of Soochow University, Suzhou 215123, China
| | - Yanglin Ji
- State Key Laboratory of Food Nutrition and Safety, Tianjin University of Science & Technology, Tianjin 300457, China
| | - Yatu Guo
- Tianjin Key Lab of Ophthalmology and Visual Science, Tianjin Eye Hospital, Tianjin Eye Institute, Tianjin 300384, China
| | - Hui Wang
- Tianjin Municipal Public Security Hospital, Tianjin 300042, China
| | - Zijian Wu
- College of Biotechnology and Food Science, Tianjin University of Commerce, Tianjin 30014, China
| | - Heyu Li
- Tianjin Ubasio Biotechnology Group Co., Ltd, Tianjin 300457, China
| | - Hao Wang
- State Key Laboratory of Food Nutrition and Safety, Tianjin University of Science & Technology, Tianjin 300457, China
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14
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Zhang XY, Chen J, Yi K, Peng L, Xie J, Gou X, Peng T, Tang L. Phlorizin ameliorates obesity-associated endotoxemia and insulin resistance in high-fat diet-fed mice by targeting the gut microbiota and intestinal barrier integrity. Gut Microbes 2020; 12:1-18. [PMID: 33222603 PMCID: PMC7714487 DOI: 10.1080/19490976.2020.1842990] [Citation(s) in RCA: 127] [Impact Index Per Article: 31.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/03/2023] Open
Abstract
Phlorizin (PHZ) is one of phytonutrients in apples that contributes to the health-promoting effect implicated by the saying, 'an apple a day keeps the doctor away'. PHZ was firstly identified as a competitive inhibitor of sodium-glucose co-transporters-2 (SGLT2); however, its low bioavailability makes it hard to fully explain its pharmacological mechanisms. This study aimed to investigate the ameliorating effect of PHZ on high-fat diet (HFD)-induced obesity via modulating the "gut microbiota-barrier axis". Firstly, C57BL/6 J mice were fed a normal chow diet (NCD) or HFD coadministered with or without PHZ for 12 weeks. Our results showed that PHZ supplementation significantly reduced HFD-induced body weight gain (P < .001), alleviated metabolic disorders (MDs) like insulin resistance (P < .001) and elevation of serum lipopolysaccharides (LPS) (P < .001), attenuated HFD-induced gut microbiota alterations, enhanced short-chain fatty acids (SCFAs) production (P < .001), and inhibited fecal LPS production (P < .001). To investigate the role of the fecal microbiota in the observed beneficial effects, a fecal microbiota transplantation (FMT) experiment was performed by transplanting the feces of the four groups of mice (as donor mice) daily collected from the fourth week to a new batch of acclimatized HFD-fed mice. Our results confirmed that feeding the gut contents of the PHZ-modulated mice could attenuate HFD-induced MDs, accompanied by enhanced glucagon-like peptide 2 (GLP-2) secretion (P < .001) and restoration of HFD-induced damage in the gut epithelial barrier. This study has provided evidence that the "gut microbiota-barrier axis" was an alternative target for the anti-obesity effect of PHZ. This work has also provided an explanation for the high efficacy of PHZ despite the low bioavailability, and PHZ holds great potential to be developed as a functional food ingredient.
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Affiliation(s)
- Xiao-Yu Zhang
- College of Life Sciences, Sichuan Normal University, Chengdu, P.R. China,CONTACT Xiao-yu Zhang College of Life Sciences, Sichuan Normal University, Chengdu610101, China
| | - Jiang Chen
- College of Life Sciences, Sichuan Normal University, Chengdu, P.R. China,College of Life Sciences, Sichuan University, Chengdu, P.R. China,Chengdu Institute of Biology, Chinese Academy of Sciences, Chengdu, P.R. China
| | - Kang Yi
- College of Life Sciences, Sichuan Normal University, Chengdu, P.R. China
| | - Ling Peng
- College of Life Sciences, Sichuan Normal University, Chengdu, P.R. China
| | - Jie Xie
- College of Life Sciences, Sichuan Normal University, Chengdu, P.R. China
| | - Xun Gou
- College of Life Sciences, Sichuan Normal University, Chengdu, P.R. China
| | - Tong Peng
- R&D Department, Keystonecare Technology (Chengdu) Co., Ltd, Chengdu, P.R. China
| | - Lin Tang
- College of Life Sciences, Sichuan University, Chengdu, P.R. China
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15
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Apaya MK, Kuo TF, Yang MT, Yang G, Hsiao CL, Chang SB, Lin Y, Yang WC. Phytochemicals as modulators of β-cells and immunity for the therapy of type 1 diabetes: Recent discoveries in pharmacological mechanisms and clinical potential. Pharmacol Res 2020; 156:104754. [DOI: 10.1016/j.phrs.2020.104754] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/07/2019] [Revised: 03/07/2020] [Accepted: 03/10/2020] [Indexed: 12/19/2022]
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16
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Li J, Du H, Zhang M, Zhang Z, Teng F, Zhao Y, Zhang W, Yu Y, Feng L, Cui X, Zhang M, Lu T, Guan F, Chen L. Amorphous solid dispersion of Berberine mitigates apoptosis via iPLA 2β/Cardiolipin/Opa1 pathway in db/db mice and in Palmitate-treated MIN6 β-cells. Int J Biol Sci 2019; 15:1533-1545. [PMID: 31337982 PMCID: PMC6643135 DOI: 10.7150/ijbs.32020] [Citation(s) in RCA: 21] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/05/2018] [Accepted: 04/12/2019] [Indexed: 01/09/2023] Open
Abstract
Aims: Berberine (BBR) improves beta-cell function in Type 2 diabetes (T2D) because of its anti-apoptotic activity, and our laboratory developed a new preparation named Huang-Gui Solid Dispersion (HGSD) to improve the oral bioavailability of BBR. However, the mechanism by which BBR inhibits beta-cell apoptosis is unclear. We hypothesized that the Group VIA Ca2+-Independent Phospholipase A2 (iPLA2β)/Cardiolipin(CL)/Opa1 signaling pathway could exert a protective role in T2D by regulating beta-cell apoptosis and that HGSD could inhibit β-cell apoptosis through iPLA2β/CL/Opa1 upregulation. Methods: We examined how iPLA2β and BBR regulated apoptosis and insulin secretion through CL/Opa1 in vivo and in vitro. In in vitro studies, we developed Palmitate(PA)-induced apoptotic cell death model in mouse insulinoma cells (MIN6). iPLA2β overexpression and silencing technology were used to examine how the iPLA2β/CL/Opa1 interaction may play an important role in BBR treatment. In in vivo studies, db/db mice were used as a diabetic animal model. The pancreatic islet function and morphology, beta-cell apoptosis and mitochondrial injury were examined to explore the effects of HGSD. The expression of iPLA2β/CL/Opa1 was measured to explore whether the signaling pathway was damaged in T2D and was involved in HGSD treatment. Results: The overexpression of iPLA2β and BBR treatment significantly attenuated Palmitate- induced mitochondrial injury and apoptotic death compared with Palmitate-treated MIN6 cell. In addition, iPLA2β silencing could simultaneously partly abolish the anti-apoptotic effect of BBR and decrease CL/Opa1 signaling in MIN6 cells. Moreover, HGSD treatment significantly decreased beta-cell apoptosis and resulted in the upregulation of iPLA2β/CL/Opa1 compared to those of the db/db mice. Conclusion: The results indicated that the regulation of iPLA2β/CL/Opa1 by HGSD may prevent beta-cell apoptosis and may improve islet beta-cell function in Type 2 diabetic mice and in palmitate-treated MIN6 cells.
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Affiliation(s)
- Junnan Li
- Department of Pharmacology, School of Basic Medical Sciences, Jilin University, Changchun 130021, China
| | - Hongwei Du
- Department of Pediatric Endocrinology, The First Clinical Hospital Affiliated to Jilin University, Changchun 130021, China
| | - Meishuang Zhang
- Department of Pharmacology, School of Basic Medical Sciences, Jilin University, Changchun 130021, China
| | - Zhi Zhang
- School of Life Sciences, Jilin University, Changchun 130012, China
| | - Fei Teng
- Department of Pharmacology, School of Basic Medical Sciences, Jilin University, Changchun 130021, China
| | - Yali Zhao
- Department of Pharmacology, School of Basic Medical Sciences, Jilin University, Changchun 130021, China
| | - Wenyou Zhang
- Department of Pharmacology, School of Basic Medical Sciences, Jilin University, Changchun 130021, China
| | - Yang Yu
- Department of Pharmacology, School of Basic Medical Sciences, Jilin University, Changchun 130021, China
| | - Linjing Feng
- Department of Pharmacology, School of Basic Medical Sciences, Jilin University, Changchun 130021, China
| | - Xinming Cui
- Key Laboratory of Pathobiology, Ministry of Education, School of Basic Medical Sciences, Jilin University, Changchun 130021, China
| | - Ming Zhang
- Department of Pharmacology, School of Basic Medical Sciences, Jilin University, Changchun 130021, China
| | - Tzongshi Lu
- Brigham and Women's Hospital, Harvard Medical School, Boston, MA 02115, United States
| | - Fengying Guan
- Department of Pharmacology, School of Basic Medical Sciences, Jilin University, Changchun 130021, China.,Brigham and Women's Hospital, Harvard Medical School, Boston, MA 02115, United States
| | - Li Chen
- Department of Pharmacology, School of Basic Medical Sciences, Jilin University, Changchun 130021, China
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17
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Pumpkin polysaccharide modifies the gut microbiota during alleviation of type 2 diabetes in rats. Int J Biol Macromol 2018; 115:711-717. [DOI: 10.1016/j.ijbiomac.2018.04.127] [Citation(s) in RCA: 82] [Impact Index Per Article: 13.7] [Reference Citation Analysis] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/09/2018] [Revised: 04/21/2018] [Accepted: 04/23/2018] [Indexed: 12/13/2022]
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18
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Bai M, Liu Y, Zhou F, Zhang Y, Zhu Q, Zhang L, Zhang Q, Wang S, Zhu K, Wang X, Zhou L. Berberine inhibits glucose oxidation and insulin secretion in rat islets. Endocr J 2018; 65:469-477. [PMID: 29467344 DOI: 10.1507/endocrj.ej17-0543] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/23/2022] Open
Abstract
Glucose promotes insulin secretion primarily via its metabolism and the production of metabolic coupling factors in beta-cells. The activation of AMP-activated protein kinase (AMPK), an energy sensor, results in a decrease in insulin secretion from beta-cells, but its mechanism remains largely unknown. Berberine, an oral anti-diabetic drug, has been shown to activate AMPK in multiple peripheral tissues. Here, we examined the effects of berberine and AMPK activation on insulin secretion and glucose oxidation in rat islets. Our results showed that berberine inhibited glucose-stimulated insulin secretion from rat islets with AMPK activation. When glucose concentration was elevated to 25 mmol/L, the inhibitory action of berberine on insulin secretion disappeared. Furthermore, berberine significantly decreased oxygen consumption rate (OCR) and ATP production induced by high glucose in rat islets. Although adenovirus-mediated overexpression of constituent-activated AMPK markedly decreased GSIS and OCR in rat islets, the inhibition of AMPK by compound C did not reverse berberine-suppressed OCR. In addition, berberine attenuated glucose-stimulated expression of fatty acid synthase. These results indicate that berberine-mediated deceleration of glucose oxidation is tightly link to the decreased insulin secretion in islets independent of AMPK activation and inhibition of fatty acid synthesis may also contribute to the effect of berberine on insulin secretion.
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Affiliation(s)
- Mengyao Bai
- Shanghai Institute of Endocrine and Metabolic Diseases, Shanghai Clinical Center for Endocrine and Metabolic Diseases, Department of Endocrine and Metabolic Diseases, Ruijin Hospital, Shanghai Jiaotong University School of Medicine, Shanghai 200025, China
| | - Yun Liu
- Shanghai Institute of Endocrine and Metabolic Diseases, Shanghai Clinical Center for Endocrine and Metabolic Diseases, Department of Endocrine and Metabolic Diseases, Ruijin Hospital, Shanghai Jiaotong University School of Medicine, Shanghai 200025, China
| | - Feiye Zhou
- Shanghai Institute of Endocrine and Metabolic Diseases, Shanghai Clinical Center for Endocrine and Metabolic Diseases, Department of Endocrine and Metabolic Diseases, Ruijin Hospital, Shanghai Jiaotong University School of Medicine, Shanghai 200025, China
| | - Yuqing Zhang
- Shanghai Institute of Endocrine and Metabolic Diseases, Shanghai Clinical Center for Endocrine and Metabolic Diseases, Department of Endocrine and Metabolic Diseases, Ruijin Hospital, Shanghai Jiaotong University School of Medicine, Shanghai 200025, China
| | - Qin Zhu
- Shanghai Institute of Endocrine and Metabolic Diseases, Shanghai Clinical Center for Endocrine and Metabolic Diseases, Department of Endocrine and Metabolic Diseases, Ruijin Hospital, Shanghai Jiaotong University School of Medicine, Shanghai 200025, China
| | - Linlin Zhang
- Shanghai Institute of Endocrine and Metabolic Diseases, Shanghai Clinical Center for Endocrine and Metabolic Diseases, Department of Endocrine and Metabolic Diseases, Ruijin Hospital, Shanghai Jiaotong University School of Medicine, Shanghai 200025, China
| | - Qi Zhang
- Department of Endocrinology, Xinhua Hospital, Shanghai Jiaotong University School of Medicine, Shanghai 200092, China
| | - Shushu Wang
- Shanghai Institute of Endocrine and Metabolic Diseases, Shanghai Clinical Center for Endocrine and Metabolic Diseases, Department of Endocrine and Metabolic Diseases, Ruijin Hospital, Shanghai Jiaotong University School of Medicine, Shanghai 200025, China
| | - Kecheng Zhu
- Shanghai Institute of Endocrine and Metabolic Diseases, Shanghai Clinical Center for Endocrine and Metabolic Diseases, Department of Endocrine and Metabolic Diseases, Ruijin Hospital, Shanghai Jiaotong University School of Medicine, Shanghai 200025, China
| | - Xiao Wang
- Shanghai Institute of Endocrine and Metabolic Diseases, Shanghai Clinical Center for Endocrine and Metabolic Diseases, Department of Endocrine and Metabolic Diseases, Ruijin Hospital, Shanghai Jiaotong University School of Medicine, Shanghai 200025, China
| | - Libin Zhou
- Shanghai Institute of Endocrine and Metabolic Diseases, Shanghai Clinical Center for Endocrine and Metabolic Diseases, Department of Endocrine and Metabolic Diseases, Ruijin Hospital, Shanghai Jiaotong University School of Medicine, Shanghai 200025, China
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19
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Mei X, Zhang X, Wang Z, Gao Z, Liu G, Hu H, Zou L, Li X. Insulin Sensitivity-Enhancing Activity of Phlorizin Is Associated with Lipopolysaccharide Decrease and Gut Microbiota Changes in Obese and Type 2 Diabetes (db/db) Mice. JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY 2016; 64:7502-7511. [PMID: 27635781 DOI: 10.1021/acs.jafc.6b03474] [Citation(s) in RCA: 81] [Impact Index Per Article: 10.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
Phlorizin exists in a number of fruits and foods and exhibits many bioactivities. The mechanism of its antidiabetic effect has been known as it can competitively inhibit sodium-glucose symporters (SGLTs). However, phlorizin has a wide range of two-phase metabolism in systemic circulation and shows poor oral bioavailability. An alternative mechanism may involve gut microbiota in intestine. Sixteen obese mice with type 2 diabetes (db/db) and eight age-matched control mice (db/+) were divided into three groups: diabetic group treated with phlorizin (DMT group), vehicle-treated diabetic group (DM group), and normal control group (CC group). Phlorizin was given in normal saline solution by intragastric administration for 10 weeks. After the last treatment course, body weight, energy intake, serum lipopolysaccharides (LPS), insulin resistance, and fecal short-chain fatty acids (SCFAs) were compared. 16S rRNA gene denaturing gradient gel electrophoresis (DGGE) and quantitative PCR were used to determine the changes in microbiome composition. Coadministration of phlorizin significantly prevented metabolic syndrome by decreasing weight gain, energy intake, serum lipopolysaccharides, and insulin resistance, and the fecal level of total SCFAs was dramatically increased, especially butyric acid. DGGE and quantitative PCR demonstrated that phlorizin coadministration increased the gut microbial diversity and the growth of Akkermansia muciniphila and Prevotella. Meanwhile, the gut microbiota structure of db/db mice after phlorizin treatment was improved and approached the normal group. The mechanism of the hypoglycemic action of phlorizin is associated with LPS decrease and gut microbiota changes; briefly, it acts in the intestine to modify gut microbial community structure, resulting in lower LPS load in the host and higher SCFAs producing beneficial bacteria.
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Affiliation(s)
- Xueran Mei
- College of Life Sciences, Sichuan Normal University , Longquan, Chengdu 610101, China
- Metabonomics Synergy Innovation Laboratory, School of Medicine and Nursing, Chengdu University , Longquan, Chengdu 610106, China
| | - Xiaoyu Zhang
- College of Life Sciences, Sichuan Normal University , Longquan, Chengdu 610101, China
| | - Zhanguo Wang
- Metabonomics Synergy Innovation Laboratory, School of Medicine and Nursing, Chengdu University , Longquan, Chengdu 610106, China
| | - Ziyang Gao
- College of Life Sciences, Sichuan Normal University , Longquan, Chengdu 610101, China
| | - Gang Liu
- College of Life Sciences, Sichuan Normal University , Longquan, Chengdu 610101, China
| | - Huiling Hu
- School of Pharmacy, Chengdu University of Traditional Chinese Medicine , Wenjiang, Chengdu 610730, China
| | - Liang Zou
- Metabonomics Synergy Innovation Laboratory, School of Medicine and Nursing, Chengdu University , Longquan, Chengdu 610106, China
| | - Xueli Li
- College of Life Sciences, Sichuan Normal University , Longquan, Chengdu 610101, China
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Oh YS. Plant-Derived Compounds Targeting Pancreatic Beta Cells for the Treatment of Diabetes. EVIDENCE-BASED COMPLEMENTARY AND ALTERNATIVE MEDICINE : ECAM 2015; 2015:629863. [PMID: 26587047 PMCID: PMC4637477 DOI: 10.1155/2015/629863] [Citation(s) in RCA: 45] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 08/21/2015] [Accepted: 10/04/2015] [Indexed: 12/11/2022]
Abstract
Diabetes is a global health problem and a national economic burden. Although several antidiabetic drugs are available, the need for novel therapeutic agents with improved efficacy and few side effects remains. Drugs derived from natural compounds are more attractive than synthetic drugs because of their diversity and minimal side effects. This review summarizes the most relevant effects of various plant-derived natural compounds on the functionality of pancreatic beta cells. Published data suggest that natural compounds directly enhance insulin secretion, prevent pancreatic beta cell apoptosis, and modulate pancreatic beta cell differentiation and proliferation. It is essential to continuously investigate natural compounds as sources of novel pharmaceuticals. Therefore, more studies into these compounds' mechanisms of action are warranted for their development as potential anti-diabetics.
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Affiliation(s)
- Yoon Sin Oh
- Lee Gil Ya Cancer and Diabetes Institute, Gachon University, Incheon 406-840, Republic of Korea
- Gachon Medical Research Institute, Gil Hospital, Incheon 405-760, Republic of Korea
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21
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Yu Y, Hao G, Zhang Q, Hua W, Wang M, Zhou W, Zong S, Huang M, Wen X. Berberine induces GLP-1 secretion through activation of bitter taste receptor pathways. Biochem Pharmacol 2015. [PMID: 26206195 DOI: 10.1016/j.bcp.2015.07.012] [Citation(s) in RCA: 63] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/17/2023]
Abstract
Our previous studies revealed that berberine-mediated GLP-1 secretion was a possible mechanism for berberine exerting good effects on hyperglycemia. This study was designed to ascertain whether berberine-induced secretion of GLP-1 was related with activation of bitter taste receptors expressed in gastrointestinal tract. Western blotting results showed that TAS2R38, a subtype of bitter taste receptor, was expressed on human enteroendocrine NCI-H716 cells. GLP-1 secretion induced by berberine from NCI-H716 cells was inhibited by incubation with anti-TAS2R38 antibody. We further performed gene silencing using siRNA to knockdown TAS2R38 from NCI-H716 cells, which showed that siRNA knockdown of the TAS2R38 reduced berberine-mediated GLP-1 secretion. We adopted inhibitors of PLC and TRPM5 known to be involved in bitter taste transduction to investigate the underlying pathways mediated in berberine-induced GLP-1 secretion. It was found that PLC inhibitor U73122 inhibited berberine-induced GLP-1 release in NCI-H716 cells, while TRPM5 blocker quinine failed to attenuate berberine-induced secretion of GLP-1. The present results demonstrated that berberine stimulated GLP-1 secretion via activation of gut-expressed bitter taste receptors in a PLC-dependent manner. Because berberine was found to be a ligand of bitter taste receptor, the results of present study may provide an explanation for some bitter taste substance obtain hypoglycemic effect.
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Affiliation(s)
- Yunli Yu
- Department of Clinical Pharmacology, The Second Affiliated Hospital of Soochow University, Suzhou 215004, PR China.
| | - Gang Hao
- Suzhou Institute for Food and Drug Control, 215104, PR China.
| | - Quanying Zhang
- Department of Clinical Pharmacology, The Second Affiliated Hospital of Soochow University, Suzhou 215004, PR China.
| | - Wenyan Hua
- Department of Clinical Pharmacology, The Second Affiliated Hospital of Soochow University, Suzhou 215004, PR China.
| | - Meng Wang
- Department of Clinical Pharmacology, The Second Affiliated Hospital of Soochow University, Suzhou 215004, PR China.
| | - Wenjia Zhou
- Department of Clinical Pharmacology, The Second Affiliated Hospital of Soochow University, Suzhou 215004, PR China.
| | - Shunlin Zong
- Department of Clinical Pharmacology, The Second Affiliated Hospital of Soochow University, Suzhou 215004, PR China.
| | - Ming Huang
- Department of Clinical Pharmacology, The Second Affiliated Hospital of Soochow University, Suzhou 215004, PR China.
| | - Xiaozhou Wen
- Jiangsu Province Hospital of Traditional Chinese Medicine, 210029, PR China.
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Berberine Induces Cell Apoptosis through Cytochrome C/Apoptotic Protease-Activating Factor 1/Caspase-3 and Apoptosis Inducing Factor Pathway in Mouse Insulinoma Cells. Chin J Integr Med 2015; 25:853-860. [DOI: 10.1007/s11655-015-2280-5] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 01/07/2015] [Indexed: 12/20/2022]
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23
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Liu YX, Si MM, Lu W, Zhang LX, Zhou CX, Deng SL, Wu HS. Effects and molecular mechanisms of the antidiabetic fraction of Acorus calamus L. on GLP-1 expression and secretion in vivo and in vitro. JOURNAL OF ETHNOPHARMACOLOGY 2015; 166:168-175. [PMID: 25792018 DOI: 10.1016/j.jep.2015.03.014] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/20/2014] [Revised: 02/11/2015] [Accepted: 03/08/2015] [Indexed: 06/04/2023]
Abstract
ETHNOPHARMACOLOGICAL RELEVANCE The radix of Acorus calamus L. (AC) is widely used in diabetes therapies in traditional folk medicine from America and Indonesia, and we have previously reported that the ethyl acetate fraction of AC (ACE) acts as an antidiabetic through insulin sensitizing, insulin releasing and alpha-glucosidase inhibitory activities. The present study is designed to investigate the effects and molecular mechanisms of ACE on glucagon-like peptide-1 (GLP-1) expression and secretion related to its hypoglycemic effects. MATERIALS AND METHODS The hypoglycemic effect of ACE (100mg/kg, i.g.) was confirmed by testing blood glucose levels or via oral glucose tolerance test (OGTT) in streptozotocin (STZ) induced hyperglycemic mice, db/db diabetic mice and diet-induced obese (DIO) mice. Plasma insulin, GLP-1 levels and intestinal GLP-1 related gene expression were determined in STZ-induced and db/db diabetic mice. The in vitro effects of ACE (12.5μg/ml) on the expression and secretion of GLP-1 were detected in NCI-H716 intestinal L-cells, and the correlation between ACE and molecules in the Wnt signaling pathway was further explored. RESULTS ACE (100mg/kg) significantly lowered fasting blood glucose in STZ-induced and db/db diabetic mice and improved the OGTT in DIO mice. Insulin releasing and islet protective effects, along with the increased secretion of GLP-1, were observed. The expression of proglucagon gene (gcg) and post-translational processing gene prohormone convertase 3 (pc3) and the GLP-1 content in the culture medium of L-cells notably increased after the ACE treatment (12.5μg/ml). At the same time, β-catenin nuclear translocation occurred, and its downstream protein cyclin D1 was activated, showing the involvement of Wnt signaling. CONCLUSIONS ACE might activate Wnt signaling to increase the gene expression of gcg and pc3 and exert incretin effects, including insulinotropic and islet protection, to lower blood glucose levels via elevated GLP-1 secretion either directly or indirectly.
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Affiliation(s)
- Yun-Xi Liu
- Institute of Pharmacology & Toxicology and Biochemical Pharmaceutics, College of Pharmaceutical Sciences, Zhejiang University, 866 Yu-hang-tang Road, Hangzhou, China
| | - Mei-Mei Si
- Institute of Pharmacology & Toxicology and Biochemical Pharmaceutics, College of Pharmaceutical Sciences, Zhejiang University, 866 Yu-hang-tang Road, Hangzhou, China
| | - Wei Lu
- Experiment Education Center for Pharmaceutical Sciences, Zhejiang University, Hangzhou, China
| | - Li-Xia Zhang
- Experiment Education Center for Pharmaceutical Sciences, Zhejiang University, Hangzhou, China
| | - Chang-Xin Zhou
- Department of Traditional Chinese Medicine and Natural Drug Research, College of Pharmaceutical Science, Zhejiang University, Hangzhou, China
| | - Shu-Li Deng
- Department of Conservative Dentistry, Affiliated Hospital of Stomatology, Zhejiang University, Hangzhou, China
| | - Hao-Shu Wu
- Institute of Pharmacology & Toxicology and Biochemical Pharmaceutics, College of Pharmaceutical Sciences, Zhejiang University, 866 Yu-hang-tang Road, Hangzhou, China; Experiment Education Center for Pharmaceutical Sciences, Zhejiang University, Hangzhou, China.
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Zhang J, Tang H, Deng R, Wang N, Zhang Y, Wang Y, Liu Y, Li F, Wang X, Zhou L. Berberine Suppresses Adipocyte Differentiation via Decreasing CREB Transcriptional Activity. PLoS One 2015; 10:e0125667. [PMID: 25928058 PMCID: PMC4415922 DOI: 10.1371/journal.pone.0125667] [Citation(s) in RCA: 45] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/06/2014] [Accepted: 03/23/2015] [Indexed: 11/25/2022] Open
Abstract
Berberine, one of the major constituents of Chinese herb Rhizoma coptidis, has been demonstrated to lower blood glucose, blood lipid, and body weight in patients with type 2 diabetes mellitus. The anti-obesity effect of berberine has been attributed to its anti-adipogenic activity. However, the underlying molecular mechanism remains largely unknown. In the present study, we found that berberine significantly suppressed the expressions of CCAAT/enhancer-binding protein (C/EBP)α, peroxisome proliferators-activated receptor γ2 (PPARγ2), and other adipogenic genes in the process of adipogenesis. Berberine decreased cAMP-response element-binding protein (CREB) phosphorylation and C/EBPβ expression at the early stage of 3T3-L1 preadipocyte differentiation. In addition, CREB phosphorylation and C/EBPβ expression induced by 3-isobutyl-1-methylxanthine (IBMX) and forskolin were also attenuated by berberine. The binding activities of cAMP responsive element (CRE) stimulated by IBMX and forskolin were inhibited by berberine. The binding of phosphorylated CREB to the promoter of C/EBPβ was abrogated by berberine after the induction of preadipocyte differentiation. These results suggest that berberine blocks adipogenesis mainly via suppressing CREB activity, which leads to a decrease in C/EBPβ-triggered transcriptional cascades.
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Affiliation(s)
- Juan Zhang
- Shanghai Clinical Center for Endocrine and Metabolic Diseases, Shanghai Institute of Endocrine and Metabolic Diseases, Department of Endocrine and Metabolic Diseases, Ruijin Hospital, Shanghai Jiaotong University School of Medicine, Shanghai, China
| | - Hongju Tang
- Shanghai Clinical Center for Endocrine and Metabolic Diseases, Shanghai Institute of Endocrine and Metabolic Diseases, Department of Endocrine and Metabolic Diseases, Ruijin Hospital, Shanghai Jiaotong University School of Medicine, Shanghai, China
| | - Ruyuan Deng
- Shanghai Clinical Center for Endocrine and Metabolic Diseases, Shanghai Institute of Endocrine and Metabolic Diseases, Department of Endocrine and Metabolic Diseases, Ruijin Hospital, Shanghai Jiaotong University School of Medicine, Shanghai, China
| | - Ning Wang
- Shanghai Clinical Center for Endocrine and Metabolic Diseases, Shanghai Institute of Endocrine and Metabolic Diseases, Department of Endocrine and Metabolic Diseases, Ruijin Hospital, Shanghai Jiaotong University School of Medicine, Shanghai, China
| | - Yuqing Zhang
- Shanghai Clinical Center for Endocrine and Metabolic Diseases, Shanghai Institute of Endocrine and Metabolic Diseases, Department of Endocrine and Metabolic Diseases, Ruijin Hospital, Shanghai Jiaotong University School of Medicine, Shanghai, China
| | - Yao Wang
- Shanghai Clinical Center for Endocrine and Metabolic Diseases, Shanghai Institute of Endocrine and Metabolic Diseases, Department of Endocrine and Metabolic Diseases, Ruijin Hospital, Shanghai Jiaotong University School of Medicine, Shanghai, China
| | - Yun Liu
- Shanghai Clinical Center for Endocrine and Metabolic Diseases, Shanghai Institute of Endocrine and Metabolic Diseases, Department of Endocrine and Metabolic Diseases, Ruijin Hospital, Shanghai Jiaotong University School of Medicine, Shanghai, China
| | - Fengying Li
- Shanghai Clinical Center for Endocrine and Metabolic Diseases, Shanghai Institute of Endocrine and Metabolic Diseases, Department of Endocrine and Metabolic Diseases, Ruijin Hospital, Shanghai Jiaotong University School of Medicine, Shanghai, China
| | - Xiao Wang
- Shanghai Clinical Center for Endocrine and Metabolic Diseases, Shanghai Institute of Endocrine and Metabolic Diseases, Department of Endocrine and Metabolic Diseases, Ruijin Hospital, Shanghai Jiaotong University School of Medicine, Shanghai, China
| | - Libin Zhou
- Shanghai Clinical Center for Endocrine and Metabolic Diseases, Shanghai Institute of Endocrine and Metabolic Diseases, Department of Endocrine and Metabolic Diseases, Ruijin Hospital, Shanghai Jiaotong University School of Medicine, Shanghai, China
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Liu L, Liu J, Gao Y, Yu X, Xu G, Huang Y. Uncoupling protein-2 mediates the protective action of berberine against oxidative stress in rat insulinoma INS-1E cells and in diabetic mouse islets. Br J Pharmacol 2015; 171:3246-54. [PMID: 24588674 DOI: 10.1111/bph.12666] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/10/2014] [Accepted: 02/27/2014] [Indexed: 12/14/2022] Open
Abstract
BACKGROUND AND PURPOSE Uncoupling protein-2 (UCP2) may regulate glucose-stimulated insulin secretion. The current study investigated the effects of berberine, an alkaloid found in many medicinal plants, on oxidative stress and insulin secretion through restoration of UCP2 expression in high glucose (HG)-treated INS-1E cells and rat islets or in db/db mouse islets. EXPERIMENTAL APPROACH Mouse and rat pancreatic islets were isolated. Nitrotyrosine, superoxide dismutase (SOD)-1 and UCP2 expression and AMPK phosphorylation were examined by Western blotting. Insulin secretion was measured by ELISA. Mitochondrial reactive oxygen species (ROS) production was detected by confocal microscopy. KEY RESULTS Incubation of INS-1E cells and rat islets with HG (30 mmol·L(-1); 8 h) elevated nitrotyrosine level, reduced SOD-1 and UCP2 expression and AMPK phosphorylation, and inhibited glucose-stimulated insulin secretion. HG also increased mitochondrial ROS in INS-1E cells. Co-treatment with berberine inhibited such effects. The AMPK inhibitor compound C, the UCP2 inhibitor genipin and adenovirus ucp2 shRNA inhibited these protective effects of berberine. Furthermore, compound C normalized berberine-stimulated UCP2 expression but genipin did not affect AMPK phosphorylation. Islets from db/db mice exhibited elevated nitrotyrosine levels, reduced expression of SOD-1 and UCP2 and AMPK phosphorylation, and decreased insulin secretion compared with those from db/m(+) mice. Berberine also improved these defects in diabetic islets and genipin blocked the effects of berberine. CONCLUSIONS AND IMPLICATIONS Berberine inhibited oxidative stress and restored insulin secretion in HG-treated INS-IE cells and diabetic mouse islets by activating AMPK and UCP2. UCP2 is an important signalling molecule in mediating anti-diabetic effects of berberine.
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Affiliation(s)
- Limei Liu
- Department of Physiology and Pathophysiology, Peking University Health Science Center, Peking, China
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Effects of berberine and cinnamic acid on palmitic acid-induced intracellular triglyceride accumulation in NIT-1 pancreatic β cells. Chin J Integr Med 2014; 22:496-502. [PMID: 25491540 DOI: 10.1007/s11655-014-1986-0] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/04/2014] [Indexed: 12/12/2022]
Abstract
OBJECTIVE To investigate the effects of berberine (BBR) and cinnamic acid (CA), the main active components in Jiaotai Pill (, JTP), on palmitic acid (PA)-induced intracellular triglyceride (TG) accumulation in NIT-1 pancreatic β cells. METHODS Cells were incubated in culture medium containing PA (0.25 mmol/L) for 24 h. Then treatments with BBR (10 μmol/L), CA (100 μmol/L) and the combination of BBR and CA (BBR+CA) were performed respectively. Intracellular lipid accumulation was assessed by Oil Red O staining and TG content was measured by colorimetric assay. The expression of adenosine monophosphate-activated protein kinase (AMPK) protein and its downstream lipogenic and fatty acid oxidation genes, including fatty acid synthase (FAS), acetyl-coA carboxylase (ACC), phosphorylation acetyl-coA carboxylase (pACC), carnitine acyl transferase 1 (CPT-1) and sterol regulating element binding protein 1c (SREBP-1c) were determined by Western blot or real time polymerase chain reaction. RESULTS PA induced an obvious lipid accumulation and a significant increase in intracellular TG content in NIT-1 cells. PA also induced a remarkable decrease in AMPK protein expression and its downstream targets such as pACC and CPT-1. Meanwhile, AMPK downstream lipogenic genes including SREBP-1c mRNA, FAS and ACC protein expressions were increased. Treatments with BBR and BBR+CA, superior to CA, significantly reversed the above genes changes in NIT-1 pancreatic β cells. However, the synergistic effect of BBR and CA on intracellular TG content was not observed in the present study. CONCLUSION It can be concluded that in vitro, BBR and BBR+CA could inhibit PA-induced lipid accumulation by decreasing lipogenesis and increasing lipid oxidation in NIT-1 pancreatic β cells.
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Deng Y, Xu J, Zhang X, Yang J, Zhang D, Huang J, Lv P, Shen W, Yang Y. Berberine attenuates autophagy in adipocytes by targeting BECN1. Autophagy 2014; 10:1776-86. [PMID: 25126729 DOI: 10.4161/auto.29746] [Citation(s) in RCA: 54] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023] Open
Abstract
The lysosomal degradation pathway, autophagy, is essential for the maintenance of cellular homeostasis. Recently, autophagy has been demonstrated to be required in the process of adipocyte conversion. However, its role in mature adipocytes under physiological and pathological conditions remains unclear. Here, we report a major function of BECN1 in the regulation of basal autophagy in mature adipocytes. We also show that berberine, a natural plant alkaloid, inhibits basal autophagy in adipocytes and adipose tissue of mice fed a high-fat diet via downregulation of BECN1 expression. We further demonstrate that berberine has a pronounced effect on the stability of Becn 1 mRNA through the Mir30 family. These findings explore the potential of BECN1 as a key molecule and a drug target for regulating autophagy in mature adipocytes.
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Affiliation(s)
- Yujie Deng
- Department of Endocrine and Metabolic Diseases; Institute of Endocrine and Metabolic Diseases; Ruijin Hospital; Shanghai Jiaotong University School of Medicine; Shanghai, China
| | - Jun Xu
- Department of Endocrine and Metabolic Diseases; Institute of Endocrine and Metabolic Diseases; Ruijin Hospital; Shanghai Jiaotong University School of Medicine; Shanghai, China
| | - Xiaoyan Zhang
- Department of Endocrine and Metabolic Diseases; Institute of Endocrine and Metabolic Diseases; Ruijin Hospital; Shanghai Jiaotong University School of Medicine; Shanghai, China
| | - Jian Yang
- Department of Endocrine and Metabolic Diseases; Institute of Endocrine and Metabolic Diseases; Ruijin Hospital; Shanghai Jiaotong University School of Medicine; Shanghai, China
| | - Di Zhang
- Department of Endocrine and Metabolic Diseases; Institute of Endocrine and Metabolic Diseases; Ruijin Hospital; Shanghai Jiaotong University School of Medicine; Shanghai, China
| | - Jian Huang
- Department of Endocrine and Metabolic Diseases; Institute of Endocrine and Metabolic Diseases; Ruijin Hospital; Shanghai Jiaotong University School of Medicine; Shanghai, China
| | - Pengfei Lv
- Department of Endocrine and Metabolic Diseases; Institute of Endocrine and Metabolic Diseases; Ruijin Hospital; Shanghai Jiaotong University School of Medicine; Shanghai, China
| | - Weili Shen
- Shanghai Key Laboratory of Vascular Biology; Department of Hypertension; Ruijin Hospital; Shanghai Jiaotong University School of Medicine; Shanghai, China
| | - Ying Yang
- Department of Endocrine and Metabolic Diseases; Institute of Endocrine and Metabolic Diseases; Ruijin Hospital; Shanghai Jiaotong University School of Medicine; Shanghai, China
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Whole exome sequencing of insulinoma reveals recurrent T372R mutations in YY1. Nat Commun 2014; 4:2810. [PMID: 24326773 DOI: 10.1038/ncomms3810] [Citation(s) in RCA: 100] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/04/2013] [Accepted: 10/23/2013] [Indexed: 12/24/2022] Open
Abstract
Functional pancreatic neuroendocrine tumours (PNETs) are mainly represented by insulinoma, which secrete insulin independent of glucose and cause hypoglycaemia. The major genetic alterations in sporadic insulinomas are still unknown. Here we identify recurrent somatic T372R mutations in YY1 by whole exome sequencing of 10 sporadic insulinomas. Further screening in 103 additional insulinomas reveals this hotspot mutation in 30% (34/113) of all tumours. T372R mutation alters the expression of YY1 target genes in insulinomas. Clinically, the T372R mutation is associated with the later onset of tumours. Genotyping of YY1, a target of mTOR inhibitors, may contribute to medical treatment of insulinomas. Our findings highlight the importance of YY1 in pancreatic β-cells and may provide therapeutic targets for PNETs.
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ZHANG JUAN, TANG HONGJU, ZHANG YUQING, DENG RUYUAN, SHAO LI, LIU YUN, LI FENGYING, WANG XIAO, ZHOU LIBIN. Identification of suitable reference genes for quantitative RT-PCR during 3T3-L1 adipocyte differentiation. Int J Mol Med 2014; 33:1209-18. [DOI: 10.3892/ijmm.2014.1695] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/07/2013] [Accepted: 02/27/2014] [Indexed: 11/06/2022] Open
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Jiang Y, Huang W, Wang J, Xu Z, He J, Lin X, Zhou Z, Zhang J. Metformin plays a dual role in MIN6 pancreatic β cell function through AMPK-dependent autophagy. Int J Biol Sci 2014; 10:268-77. [PMID: 24644425 PMCID: PMC3957082 DOI: 10.7150/ijbs.7929] [Citation(s) in RCA: 85] [Impact Index Per Article: 8.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/18/2013] [Accepted: 02/07/2014] [Indexed: 12/20/2022] Open
Abstract
Metformin improves insulin sensitivity in insulin sensitive tissues such as liver, muscle and fat. However, the functional roles and the underlying mechanism of metformin action in pancreatic β cells remain elusive. Here we show that, under normal growth condition, metformin suppresses MIN6 β cell proliferation and promotes apoptosis via an AMPK-dependent and autophagy-mediated mechanism. On the other hand, metformin protects MIN6 cells against palmitic acid (PA)-induced apoptosis. Our findings indicate that metformin plays a dual role in β cell survival and overdose of this anti-diabetic drug itself may lead to potential β cell toxicity.
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Affiliation(s)
- Yingling Jiang
- 1. Metabolic Syndrome Research Center and Diabetes Center, Institute of Aging and Geriatric Diseases, Key Laboratory of Diabetes Immunology, Ministry of Education, Institute of Metabolism and Endocrinology, Second Xiangya Hospital, Central South University, Changsha, Hunan, China 410011 ; 2. Endocrinology Department, Zhuzhou Central Hospital, Zhuzhou, Hunan, China 412007
| | - Wei Huang
- 1. Metabolic Syndrome Research Center and Diabetes Center, Institute of Aging and Geriatric Diseases, Key Laboratory of Diabetes Immunology, Ministry of Education, Institute of Metabolism and Endocrinology, Second Xiangya Hospital, Central South University, Changsha, Hunan, China 410011
| | - Jing Wang
- 1. Metabolic Syndrome Research Center and Diabetes Center, Institute of Aging and Geriatric Diseases, Key Laboratory of Diabetes Immunology, Ministry of Education, Institute of Metabolism and Endocrinology, Second Xiangya Hospital, Central South University, Changsha, Hunan, China 410011
| | - Zhipeng Xu
- 1. Metabolic Syndrome Research Center and Diabetes Center, Institute of Aging and Geriatric Diseases, Key Laboratory of Diabetes Immunology, Ministry of Education, Institute of Metabolism and Endocrinology, Second Xiangya Hospital, Central South University, Changsha, Hunan, China 410011
| | - Jieyu He
- 1. Metabolic Syndrome Research Center and Diabetes Center, Institute of Aging and Geriatric Diseases, Key Laboratory of Diabetes Immunology, Ministry of Education, Institute of Metabolism and Endocrinology, Second Xiangya Hospital, Central South University, Changsha, Hunan, China 410011
| | - Xiaohong Lin
- 2. Endocrinology Department, Zhuzhou Central Hospital, Zhuzhou, Hunan, China 412007
| | - Zhiguang Zhou
- 1. Metabolic Syndrome Research Center and Diabetes Center, Institute of Aging and Geriatric Diseases, Key Laboratory of Diabetes Immunology, Ministry of Education, Institute of Metabolism and Endocrinology, Second Xiangya Hospital, Central South University, Changsha, Hunan, China 410011
| | - Jingjing Zhang
- 1. Metabolic Syndrome Research Center and Diabetes Center, Institute of Aging and Geriatric Diseases, Key Laboratory of Diabetes Immunology, Ministry of Education, Institute of Metabolism and Endocrinology, Second Xiangya Hospital, Central South University, Changsha, Hunan, China 410011
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Berberine reverts hepatic mitochondrial dysfunction in high-fat fed rats: a possible role for SirT3 activation. Mitochondrion 2013; 13:637-46. [PMID: 24041461 DOI: 10.1016/j.mito.2013.09.002] [Citation(s) in RCA: 84] [Impact Index Per Article: 7.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/24/2013] [Revised: 08/06/2013] [Accepted: 09/06/2013] [Indexed: 02/07/2023]
Abstract
Berberine is an isoquinoline alkaloid with anti-diabetic properties. Despite the central role of liver and thus hepatic mitochondria in whole-body metabolism, berberine effects on hepatic mitochondrial function in an obesity model are still unknown. Here, we demonstrate that berberine treatment recovers mitochondrial efficiency when altered by a high-fat feeding. Mitochondria isolated from the liver of high-fat fed rats exhibited decreased capacity to accumulate calcium and impaired oxidative phosphorylation (OXPHOS) capacity, as shown by impaired mitochondrial membrane potential, oxygen consumption and cellular ATP levels. Interestingly, the recovery of mitochondrial function by berberine was associated with an increased activity of the mitochondrial sirtuin 3 (SirT3). In conclusion, berberine potent protective effects against metabolic syndrome may rely on increasing mitochondrial SirT3 activity, normalizing mitochondrial function and preventing a state of energetic deficit caused by impaired OXPHOS.
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Grape seed procyanidins improve β-cell functionality under lipotoxic conditions due to their lipid-lowering effect. J Nutr Biochem 2013; 24:948-53. [DOI: 10.1016/j.jnutbio.2012.06.015] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/13/2011] [Revised: 04/04/2012] [Accepted: 06/15/2012] [Indexed: 11/20/2022]
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Fu A, Eberhard CE, Screaton RA. Role of AMPK in pancreatic beta cell function. Mol Cell Endocrinol 2013; 366:127-34. [PMID: 22766107 DOI: 10.1016/j.mce.2012.06.020] [Citation(s) in RCA: 82] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/05/2011] [Revised: 05/08/2012] [Accepted: 06/21/2012] [Indexed: 10/28/2022]
Abstract
Pharmacological activation of AMP activated kinase (AMPK) by metformin has proven to be a beneficial therapeutic approach for the treatment of type II diabetes. Despite improved glucose regulation achieved by administration of small molecule activators of AMPK, the potential negative impact of enhanced AMPK activity on insulin secretion by the pancreatic beta cell is an important consideration. In this review, we discuss our current understanding of the role of AMPK in central functions of the pancreatic beta cell, including glucose-stimulated insulin secretion (GSIS), proliferation, and survival. In addition we discuss the controversy surrounding the role of AMPK in insulin secretion, underscoring the merits and caveats of methods used to date.
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Affiliation(s)
- Accalia Fu
- Children's Hospital of Eastern Ontario Research Institute, Ottawa, Canada
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Derosa G, Maffioli P, Cicero AFG. Berberine on metabolic and cardiovascular risk factors: an analysis from preclinical evidences to clinical trials. Expert Opin Biol Ther 2012; 12:1113-24. [PMID: 22780092 DOI: 10.1517/14712598.2012.704014] [Citation(s) in RCA: 125] [Impact Index Per Article: 10.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Abstract
INTRODUCTION Type 2 diabetes mellitus and hypercholesterolemia have proven to give an increased incidence of cardiovascular diseases (CVD). Recent studies have suggested that the natural alkaloid berberine could have pharmacological activities potentially useful in diabetes and hypercholesterolemia management. AREAS COVERED The aim of this review is to evaluate the metabolic properties of the natural alkaloid berberine, and its potential application to the treatment of diabetes and CVD prevention. EXPERT OPINION Berberine proved to be effective in improving glycemic control and lipid profile. The modern investigation on berberine pharmacological activity is actually developing and numerous scientific evidences are actually in progress and reported in international congresses. The near future perspective is the isolation or neo-synthesis of berberine analogs with a higher bioavailability. The anti-hyperlipidemic and anti-diabetic effects of berberine have to be related to markers of improvement in organ damage in humans; longer trials are needed to better evaluate the safety profile of the molecule, when administered alone or in association with other anti-hyperlipidemic or anti-diabetic drugs, especially in the European population.
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Affiliation(s)
- Giuseppe Derosa
- University of Pavia, Department of Internal Medicine and Therapeutics, Fondazione IRCCS Policlinico S. Matteo, P.le C. Golgi, 2-27100 Pavia, Italy.
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Shen N, Huan Y, Shen ZF. Berberine inhibits mouse insulin gene promoter through activation of AMP activated protein kinase and may exert beneficial effect on pancreatic β-cell. Eur J Pharmacol 2012; 694:120-6. [DOI: 10.1016/j.ejphar.2012.07.052] [Citation(s) in RCA: 36] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/14/2012] [Revised: 07/07/2012] [Accepted: 07/11/2012] [Indexed: 11/15/2022]
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Activation of SIRT1 protects pancreatic β-cells against palmitate-induced dysfunction. Biochim Biophys Acta Mol Basis Dis 2012; 1822:1815-25. [PMID: 22968147 DOI: 10.1016/j.bbadis.2012.08.009] [Citation(s) in RCA: 44] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/01/2012] [Revised: 08/08/2012] [Accepted: 08/13/2012] [Indexed: 01/23/2023]
Abstract
Sirtuin 1 (SIRT1), a nicotinamide adenosine dinucleotide-dependent histone deacetylase, is an important regulator of energy homeostasis in response to nutrient availability. In pancreatic β-cells, SIRT1 has been shown to up-regulate insulin secretion in response to glucose stimulation. However, the potential roles of SIRT1 in islet β-cells against lipotoxicity remain poorly understood. Here, we demonstrated that SIRT1 mRNA and protein expressions were markedly reduced in the islets isolated from rats infused with 20% Intralipid for 24h. Long-term exposure to 0.4mmol/L palmitate also decreased SIRT1 expression in cultured INS-1 cells and isolated rat islets, which was prevented by 10μmol/L resveratrol, a SIRT1 agonist. In addition, resveratrol improved glucose-stimulated insulin secretion decreased by palmitate, which was abrogated by EX527, a specific SIRT1 inhibitor. Furthermore, inhibition of SIRT1 activity by EX527 or a knockdown of SIRT1 suppressed insulin promoter activity, along with decreased insulin, v-maf musculoaponeurotic fibrosarcoma oncogene homolog A (MafA), and NK6 homeodomain 1 (NKX6.1) mRNA expressions. Activation of SIRT1 by resveratrol or overexpression of SIRT1 antagonized palmitate-inhibited insulin transcriptional activity. SIRT1 overexpression exerted an additive effect on pancreatic and duodenal homeobox 1 (PDX1)-stimulated insulin promoter activity and abolished forkhead box O1 protein (FOXO1)-decreased insulin transcriptional activity. Resveratrol reversed FOXO1 nuclear translocation induced by palmitate. Our findings indicate that SIRT1 protects against palmitate-induced β-cell dysfunction.
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Structural changes of gut microbiota during berberine-mediated prevention of obesity and insulin resistance in high-fat diet-fed rats. PLoS One 2012; 7:e42529. [PMID: 22880019 PMCID: PMC3411811 DOI: 10.1371/journal.pone.0042529] [Citation(s) in RCA: 388] [Impact Index Per Article: 32.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/02/2012] [Accepted: 07/09/2012] [Indexed: 01/02/2023] Open
Abstract
Berberine, a major pharmacological component of the Chinese herb Coptis chinensis, which was originally used to treat bacterial diarrhea, has recently been demonstrated to be clinically effective in alleviating type 2 diabetes. In this study, we revealed that berberine effectively prevented the development of obesity and insulin resistance in high-fat diet (HFD)-fed rats, which showed decreased food intake. Increases in the levels of serum lipopolysaccharide-binding protein, monocyte chemoattractant protein-1, and leptin and decrease in the serum level of adiponectin corrected for body fat in HFD-fed rats were also significantly retarded by the co-administration of berberine at 100 mg/kg body weight. Bar-coded pyrosequencing of the V3 region of 16S rRNA genes revealed a significant reduction in the gut microbiota diversity of berberine-treated rats. UniFrac principal coordinates analysis revealed a marked shift of the gut microbiota structure in berberine-treated rats away from that of the controls. Redundancy analysis identified 268 berberine-responding operational taxonomic units (OTUs), most of which were essentially eliminated, whereas a few putative short-chain fatty acid (SCFA)-producing bacteria, including Blautia and Allobaculum, were selectively enriched, along with elevations of fecal SCFA concentrations. Partial least square regression models based on these 268 OTUs were established (Q2>0.6) for predicting the adiposity index, body weight, leptin and adiponectin corrected for body fat, indicating that these discrete phylotypes might have a close association with the host metabolic phenotypes. Taken together, our findings suggest that the prevention of obesity and insulin resistance by berberine in HFD-fed rats is at least partially mediated by structural modulation of the gut microbiota, which may help to alleviate inflammation by reducing the exogenous antigen load in the host and elevating SCFA levels in the intestine.
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Cicero AFG, Tartagni E. Antidiabetic properties of berberine: from cellular pharmacology to clinical effects. Hosp Pract (1995) 2012; 40:56-63. [PMID: 22615079 DOI: 10.3810/hp.2012.04.970] [Citation(s) in RCA: 45] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/01/2023]
Abstract
Berberine is an alkaloid that is highly concentrated in the roots, rhizomes, and stem bark of various plants. It affects glucose metabolism, increasing insulin secretion, stimulating glycolysis, suppressing adipogenesis, inhibiting mitochondrial function, activating the 5' adenosine monophosphate-activated protein kinase (AMPK) pathway, and increasing glycokinase activity. Berberine also increases glucose transporter-4 (GLUT-4) and glucagon-like peptide-1 (GLP-1) levels. On GLP-1 receptor activation, adenylyl cyclase is activated, and cyclic adenosine monophosphate is generated, leading to activation of second messenger pathways and closure of adenosine triphosphate-dependent potassium channels. Increased intracellular potassium causes depolarization, and calcium influx through the voltage-dependent calcium channels occurs. This intracellular calcium increase stimulates the migration and exocytosis of the insulin granules. In glucose-consuming tissues, such as adipose, or liver or muscle cells, berberine affects both GLUT-4 and retinol-binding protein-4 in favor of glucose uptake into cells; stimulates glycolysis by AMPK activation; and has effects on the peroxisome proliferator-activated receptor γ molecular targets and on the phosphorylation of insulin receptor substrate-1, finally resulting in decreased insulin resistance. Moreover, recent studies suggest that berberine could have a direct action on carbohydrate metabolism in the intestine. The antidiabetic and insulin-sensitizing effect of berberine has also been confirmed in a few relatively small, short-term clinical trials. The tolerability is high for low dosages, with some gastrointestinal complaints appearing to be associated with use of high dosages.
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Affiliation(s)
- Arrigo F G Cicero
- Internal Medicine, Aging and Kidney Diseases Department, University of Bologna, Bologna, Italy.
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Cheng F, Wang Y, Li J, Su C, Wu F, Xia WH, Yang Z, Yu BB, Qiu YX, Tao J. Berberine improves endothelial function by reducing endothelial microparticles-mediated oxidative stress in humans. Int J Cardiol 2012; 167:936-42. [PMID: 22465347 DOI: 10.1016/j.ijcard.2012.03.090] [Citation(s) in RCA: 74] [Impact Index Per Article: 6.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/25/2011] [Revised: 01/12/2012] [Accepted: 03/03/2012] [Indexed: 12/19/2022]
Abstract
BACKGROUND Circulating endothelial microparticles (EMPs) lead to endothelial dysfunction by increasing oxidative stress. Berberine has a beneficial effect on endothelial function, but no data are available on the EMP-mediated oxidative stress. The present study tests the hypothesis that berberine contributes to the improvement of endothelial function in humans via inhibiting EMP-mediated oxidative stress in vascular endothelium. METHODS Twelve healthy subjects received a 1-month berberine therapy and eleven healthy subjects served as control. Endothelium-dependent and -independent function in the brachial artery was assessed by flow-mediated vasodilation (FMD) and sublingual nitroglyceride-mediated vasodilation (NMD). Circulating EMPs and serum malondialdehyde (MDA) were measured before and after therapy. Furthermore, in vitro human umbilical vein endothelial cells (HUVECs) were stimulated by EMPs with or without presence of anti-oxidant compound apocynin or berberine. Intracellular reactive oxygen species (ROS), nitric oxide (NO) production and NADPH oxidase 4 (Nox4) protein expressions were examined, respectively. RESULTS The levels of serum MDA and circulating CD31+/CD42- MPs were significantly reduced in the berberine group compared with the control group, which were associated with improvement of FMD. The EMPs in vitro facilitated ROS production and Nox4 protein expression and reduced NO synthesis in HUVECs. These alterations can be reversed by the presence of apocynin or berberine, respectively. CONCLUSION The present study demonstrated for the first time that EMP-induced upregulation of Nox4 expression may enhance ROS production in HUVECs. Berberine treatment contributes to the amelioration of endothelial function through a partially reducing oxidative stress of vascular endothelium induced by circulating CD31+/CD42- microparticles in humans.
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Affiliation(s)
- Fei Cheng
- Department of Hypertension and Vascular Disease, The First Affiliated Hospital, Sun Yat-Sen University, Guangzhou 510080, China
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Affuso F, Mercurio V, Ruvolo A, Pirozzi C, Micillo F, Carlomagno G, Grieco F, Fazio S. A nutraceutical combination improves insulin sensitivity in patients with metabolic syndrome. World J Cardiol 2012; 4:77-83. [PMID: 22451856 PMCID: PMC3312235 DOI: 10.4330/wjc.v4.i3.77] [Citation(s) in RCA: 48] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/28/2011] [Revised: 12/21/2011] [Accepted: 12/28/2011] [Indexed: 02/06/2023] Open
Abstract
AIM To test the efficacy of a proprietary nutraceutical combination in reducing insulin resistance associated with the metabolic syndrome (MetS). METHODS Sixty-four patients with MetS followed at a tertiary outpatient clinic were randomly assigned to receive either placebo or a proprietary nutraceutical combination (AP) consisting of berberine, policosanol and red yeast rice, in a prospective, double-blind, placebo-controlled study. Evaluations were performed at baseline and after 18 wk of treatment. The homeostasis model assessment of insulin resistance (HOMA-IR) index was the primary outcome measure. Secondary endpoints included lipid panel, blood glucose and insulin fasting, after a standard mixed meal and after an oral glucose tolerance test (OGTT), flow-mediated dilation (FMD), and waist circumference. RESULTS Fifty nine patients completed the study, 2 withdrew because of adverse effects. After 18 wk there was a significant reduction in the HOMA-IR index in the AP group compared with placebo (ΔHOMA respectively -0.6 ± 1.2 vs 0.4 ± 1.9; P < 0.05). Total and low density lipoprotein cholesterol also significantly decreased in the treatment arm compared with placebo (Δlow density lipoprotein cholesterol -0.82 ± 0.68 vs -0.13 ± 0.55 mmol/L; P < 0.001), while triglycerides, high density lipoprotein cholesterol, and the OGTT were not affected. In addition, there were significant reductions in blood glucose and insulin after the standard mixed meal, as well as an increase in FMD (ΔFMD 1.9 ± 4.2 vs 0 ± 1.9 %; P < 0.05) and a significant reduction in arterial systolic blood pressure in the AP arm. CONCLUSION This short-term study shows that AP has relevant beneficial effects on insulin resistance and many other components of MetS.
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Affiliation(s)
- Flora Affuso
- Flora Affuso, Valentina Mercurio, Antonio Ruvolo, Concetta Pirozzi, Filomena Micillo, Guido Carlomagno, Fabrizia Grieco, Serafino Fazio, Department of Clinical Medicine, Cardiovascular and Immunological Sciences, Federico II University, 80131 Naples, Italy
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Abstract
The gastrointestinal epithelium transports solutes and water between lumen and blood and at the same time forms a barrier between these compartments. This highly selective and regulated barrier permits ions, water, and nutrients to be absorbed, but normally restricts the passage of harmful molecules, bacteria, viruses and other pathogens. During inflammation, the intestinal barrier can be disrupted, indicated by a decrease in transcellular electrical resistance and an increase in paracellular permeability for tracers of different size. Such inflammatory processes are accompanied by increased oxidative stress, which in turn can impair the epithelial barrier. In this review, we discuss the role of inflammatory oxidative stress on barrier function with special attention on the epithelial tight junctions. Diseases discussed causing barrier changes include the inflammatory bowel diseases Crohn's disease, ulcerative colitis, and microscopic colitis, the autoimmune disorder celiac disease, and gastrointestinal infections. In addition, the main cytokines responsible for these effects and their role during oxidative stress and intestinal inflammation will be discussed, as well as therapeutic approaches and their mode of action.
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Affiliation(s)
- Lena J John
- Department of General Medicine, Charité, Campus Benjamin Franklin, Berlin, Germany
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Prabhakar PK, Doble M. Mechanism of action of natural products used in the treatment of diabetes mellitus. Chin J Integr Med 2011; 17:563-74. [PMID: 21826590 DOI: 10.1007/s11655-011-0810-3] [Citation(s) in RCA: 105] [Impact Index Per Article: 8.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/20/2011] [Indexed: 11/24/2022]
Abstract
Diabetes mellitus (DM) is a metabolic disorder caused by insufficient or inefficient insulin secretary response and it is characterized by increased blood glucose levels (hyperglycemia). DM is a heterogonous group of syndromes. Glucose is the main energy source for the body, and in the case of DM, management of glucose becomes irregular. There are three key defects in the onset of hyperglycemia in DM, namely increased hepatic glucose production, diminished insulin secretion, and impaired insulin action. Conventional drugs treat diabetes by improving insulin sensitivity, increasing insulin production and/or decreasing the amount of glucose in blood. This article provides a comprehensive review of the mode of action of most popular hypoglycemic herbs, such as ginseng, bitter melon, fenugreek, banaba, Gymnema sylvestre and Coptis chinensis. The herbs act by increasing insulin secretion, enhancing glucose uptake by adipose and skeletal muscle tissues, inhibiting intestinal glucose absorption and inhibiting hepatic glucose production. Although evidence from animals and humans consistently supports the therapeutic effect of these phytomedicines, multicenter large-scale clinical trials have not been conducted to evaluate the safety and efficacy of these herbal medicines and their interaction with conventional drugs when administered simultaneously.
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Abstract
AMP-activated protein kinase AMP-activated protein kinase (AMPK AMPK ), a phylogenetically conserved serine/threonine protein kinase, is a major regulator of cellular and whole-body energy homeostasis that coordinates metabolic pathways in order to balance nutrient supply with energy demand. It is now recognized that pharmacological activation of AMPK improves blood glucose homeostasis, lipid profile, and blood pressure in insulin-resistant rodents. Indeed, AMPK activation mimics the beneficial effects of physical activity or those of calorie restriction calorie restriction by acting on multiple cellular targets. In addition, it is now demonstrated that AMPK is one of the probable (albeit indirect) targets of major antidiabetic drugs drugs including the biguanides (metformin metformin ) and thiazolidinedione thiazolidinedione s, as well as of insulin-sensitizing adipokines (e.g., adiponectin adiponectin ). Taken together, such findings highlight the logic underlying the concept of targeting the AMPK pathway for the treatment of metabolic syndrome and type 2 diabetes.
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Wang Y, Campbell T, Perry B, Beaurepaire C, Qin L. Hypoglycemic and insulin-sensitizing effects of berberine in high-fat diet- and streptozotocin-induced diabetic rats. Metabolism 2011; 60:298-305. [PMID: 20304443 DOI: 10.1016/j.metabol.2010.02.005] [Citation(s) in RCA: 105] [Impact Index Per Article: 8.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/21/2009] [Revised: 01/21/2010] [Accepted: 02/08/2010] [Indexed: 01/22/2023]
Abstract
Hypoglycemic effects of berberine (BBR) have been reported in several studies in cell and animal models. However, the mechanisms of action are not fully understood. The present study was therefore aimed at determining the effect and underlying mechanisms of action of BBR on diabetes in a high-fat diet- and streptozotocin-induced diabetic rat model. Ninety male Sprague-Dawley rats, 150 to 170 g, were housed individually in cages. Two groups (n = 12 each) were fed the AIN-93G diet (normal control) and the same diet modified to contain 33% fat and 2% cholesterol (high-fat control), respectively. The third group (n = 66) was fed the high-fat diet and injected intraperitoneally 2 weeks later with 35 mg/kg body weight of streptozotocin in citrate buffer (pH 4.5). The rats in both control groups were injected with the vehicle. After 12 days, rats with semifasting (5 hours) blood glucose levels between 14 and 25 mmol/L were divided into 4 groups (n = 12 each) and treated with 0 (diabetic control), 50, 100, and 150 mg/kg/d of BBR for 6 weeks while continuing on the high-fat diet. Hypoglycemic effects of BBR were consistently demonstrated by semifasting and fasting blood glucose levels, and insulin-sensitizing effects were seen during oral glucose tolerance testing. Berberine also reduced food intake while having no effect on body weight in diabetic rats. No effect of BBR was observed on plasma levels of insulin, adipokines (leptin and adiponectin), or inflammatory cytokines (tumor necrosis factor-α and C-reactive protein). Berberine did not affect the state of oxidative stress as assessed by the activity of superoxide dismutase and the concentrations of malondialdehyde and reduced and oxidized glutathione in the liver. These findings demonstrated the hypoglycemic and insulin-sensitizing capabilities of BBR, with the underlying mechanisms awaiting further investigation.
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Affiliation(s)
- Yanwen Wang
- Institute for Nutrisciences and Health, National Research Council Canada, Charlottetown, Prince Edward Island, Canada.
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Abstract
Following on from impressive economic development and urbanization, China is currently experiencing a high prevalence of metabolic syndrome. Patients with metabolic syndrome suffer from the "The Deadly Quartet" of hyperglycemia, hypertriglyceridemia, hypertension, and central (or upper body) obesity. Current treatment strategies directed towards metabolic syndrome tend to be limited to just one of these four conditions, so developing novel drugs to target multiple metabolic abnormalities could be preferable to current approaches. New insights suggest benefits of natural agents as treatments for metabolic syndrome. Herein, we review the evidence for using nine such agents developed on the basis of traditional medicine or herbal preparations.
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Affiliation(s)
- Xuan Xia
- Department of Endocrinology, The Third Affiliated Hospital of Sun Yat-Sen University, Guangzhou, China
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Tinworth KD, Harris PA, Sillence MN, Noble GK. Potential treatments for insulin resistance in the horse: A comparative multi-species review. Vet J 2010; 186:282-91. [DOI: 10.1016/j.tvjl.2009.08.032] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/17/2008] [Revised: 08/21/2009] [Accepted: 08/28/2009] [Indexed: 01/11/2023]
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Zhou L, Wang X, Yang Y, Wu L, Li F, Zhang R, Yuan G, Wang N, Chen M, Ning G. Berberine attenuates cAMP-induced lipolysis via reducing the inhibition of phosphodiesterase in 3T3-L1 adipocytes. Biochim Biophys Acta Mol Basis Dis 2010; 1812:527-35. [PMID: 20969954 DOI: 10.1016/j.bbadis.2010.10.001] [Citation(s) in RCA: 36] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/02/2009] [Revised: 10/06/2010] [Accepted: 10/08/2010] [Indexed: 12/11/2022]
Abstract
Berberine, a hypoglycemic agent, has been shown to decrease plasma free fatty acids (FFAs) level in insulin-resistant rats. In the present study, we explored the mechanism responsible for the antilipolytic effect of berberine in 3T3-L1 adipocytes. It was shown that berberine attenuated lipolysis induced by catecholamines, cAMP-raising agents, and a hydrolyzable cAMP analog, but not by tumor necrosis factor α and a nonhydrolyzable cAMP analog. Unlike insulin, the inhibitory effect of berberine on lipolysis in response to isoproterenol was not abrogated by wortmannin, an inhibitor of phosphatidylinositol 3-kinase, but additive to that of PD98059, an extracellular signal-regulated kinase kinase inhibitor. Prior exposure of adipocytes to berberine decreased the intracellular cAMP production induced by isoproterenol, forskolin, and 3-isobutyl-1-methylxanthine (IBMX), along with hormone-sensitive lipase (HSL) Ser-563 and Ser-660 dephosphorylation, but had no effect on perilipin phosphorylation. Berberine stimulated HSL Ser-565 as well as adenosine monophosphate-activated protein kinase (AMPK) phosphorylation. However, compound C, an AMPK inhibitor, did not reverse the regulatory effect of berberine on HSL Ser-563, Ser-660, and Ser-565 phosphorylation, nor the antilipolytic effect of berberine. Knockdown of AMPK using RNA interference also failed to restore berberine-suppressed lipolysis. cAMP-raising agents increased AMPK activity, which was not additive to that of berberine. Stimulation of adipocytes with berberine increased phosphodiesterase (PDE) 3B and PDE4 activity measured by hydrolysis of (3)[H]cAMP. These results suggest that berberine exerts an antilipolytic effect mainly by reducing the inhibition of PDE, leading to a decrease in cAMP and HSL phosphorylation independent of AMPK pathway.
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Affiliation(s)
- Libin Zhou
- Shanghai Institute of Endocrine and metabolic Disease, Department of Endocrine and Metabolic Disease, Shanghai Clinical Center for Endocrine and Metabolic disease, Ruijin Hospital, Shanghai Jiaotong University School of Medicine, Shanghai, China
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Rayasam GV, Tulasi VK, Sundaram S, Singh W, Kant R, Davis JA, Saini KS, Ray A. Identification of berberine as a novel agonist of fatty acid receptor GPR40. Phytother Res 2010; 24:1260-3. [PMID: 20658575 DOI: 10.1002/ptr.3165] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Abstract
Several herbal plants such as Chinese herb Rhizoma Coptidis have been reported to possess antidiabetic activity. Berberine is its major active constituent and functions as an insulin sensitizer and insulin secretagogue. It has been reported to modulate several signaling pathways and targets. The objective of the current study is to investigate if berberine can function as a ligand of fatty acid receptor GPR40, which stimulates glucose dependent insulin secretion. Towards this objective, a mammalian cell line with stable overexpression of GPR40 was generated and characterized. Berberine stimulated calcium mobilization with an EC(50) of 0.76 microM in this GPR40 overexpressing cell line. Further, berberine stimulated glucose dependent insulin secretion from rat pancreatic beta cell line. This suggests that berberine functions as an agonist of fatty acid receptor GPR40 and might be a novel antidiabetic mechanism of action for berberine.
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Affiliation(s)
- Geetha Vani Rayasam
- Department of Pharmacology, Novel Drug Discovery Research, R&D III RANBAXY, Plot 20, Sector 18, Gurgaon, Haryana, India.
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Zhou J, Zhou S. Berberine regulates peroxisome proliferator-activated receptors and positive transcription elongation factor b expression in diabetic adipocytes. Eur J Pharmacol 2010; 649:390-7. [PMID: 20868663 DOI: 10.1016/j.ejphar.2010.09.030] [Citation(s) in RCA: 43] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/16/2009] [Revised: 08/27/2010] [Accepted: 09/15/2010] [Indexed: 11/17/2022]
Abstract
Berberine has hypoglycemic and hypolipidemic effects on diabetic rats. This study investigated the relationship between hypoglycemic and hypolipidemic effects of berberine and peroxisome proliferator-activated receptors (PPARs) and positive transcription elongation factor b (P-TEFb) (including cyclin-dependent kinase 9 (CDK9) and cyclin T1) in white adipose tissue of diabetic rats and RNA interference-treated 3T3-L1 cells. Berberine promoted differentiation and inhibited lipid accumulation of 3T3-L1 cells, further decreased PPARα/δ/γ, CDK9 and cyclin T1 mRNA and protein expression and decreased tumor necrosis factor α content in supernatants of both control and RNA interference-treated 3T3-L1 cells. After a 16-week induction with 35 mg/kg streptozotocin (i.p.) and high-carbohydrate/high-fat diet, diabetic rats were treated with 75, 150 and 300 mg/kg berberine and 100 mg/kg fenofibrate or 4 mg/kg rosiglitazone for another 16 weeks. Berberine decreased white adipose tissue to body weight ratio and adipocyte size and increased adipocyte number. Berberine upregulated PPARα/δ/γ, CDK9 and cyclin T1 mRNA and protein expression in adipose tissue, decreased tumor necrosis factor α and free fatty acid content and increased lipoprotein lipase activity in serum and adipose tissue. Berberine modulated metabolic related PPARs expression and differentiation related P-TEFb expression in adipocytes, which are associated with its hypoglycemic and hypolipidemic effects.
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Affiliation(s)
- Jiyin Zhou
- Base for Drug Clinical Trial, Xinqiao Hospital, Third Military Medical University, Chongqing, 400037, PR China
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