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Chen SM, Huang TY, Lee WJ, Chuang LM, Chang TJ. Positive correlation of ANGPTL8 expression in human visceral adipose tissue with body mass index. J Formos Med Assoc 2024; 123:860-865. [PMID: 38191275 DOI: 10.1016/j.jfma.2023.12.018] [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: 05/13/2023] [Revised: 12/21/2023] [Accepted: 12/27/2023] [Indexed: 01/10/2024] Open
Abstract
BACKGROUND Angiopoietin-like protein 8 (ANGPTL8) is an important regulator of lipid metabolism. We aimed to investigate the difference of ANGPTL8 expression in different depots of adipose tissues between individuals with and without obesity, and its correlation with various metabolic parameters. METHODS Subcutaneous (SAT) and visceral adipose tissue (VAT) samples were collected from patients who underwent bariatric or intra-abdominal surgery. Expression levels of ANGPTL8, monoglyceride lipase (MGL), monocyte chemoattractant protein-1 (MCP-1), leptin and adiponectin (APM1) were determined using real-time quantitative polymerase chain reaction. The correlation of ANGPTL8 expression with various metabolic parameters and other gene expression levels was analyzed using Person's correlation analysis. Logistic regression was used to establish a prediction model of obesity. RESULTS Totally 330 subjects (obese: 281, non-obese: 49) were recruited. ANGPTL8 expression in VAT was significantly higher in the obesity group than in the non-obesity group (P = 0.0096). ANGPTL8 expression in VAT was positively correlated with body mass index (BMI) (r = 0.1169, P < 0.05) and was independently associated with obesity (O.R., 1.246; 95 % C.I. 1.013-21.533, P = 0.038). We also found the gene expression of ANGPTL8 in SAT and VAT was negatively correlated with APM1 expression in respective SAT and VAT. CONCLUSION ANGPTL8 expression levels in VAT were higher in subjects with obesity, and positively correlated with BMI. This suggests a role of ANGPTL8 in the pathophysiology of obesity and may pave the way for novel treatment target of obesity.
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Affiliation(s)
- Shiau-Mei Chen
- Department of Internal Medicine, National Taiwan University Hospital, Taipei, Taiwan
| | - Tse-Ying Huang
- Department of Internal Medicine, National Taiwan University Hospital, Hsin-Chu Branch, Taiwan
| | - Wei-Jei Lee
- Department of Surgery, Taoyuan Min-Sheng General Hospital, Taoyuan, Taiwan
| | - Lee-Ming Chuang
- Department of Internal Medicine, National Taiwan University Hospital, Taipei, Taiwan; School of Medicine, National Taiwan University, Taipei, Taiwan; Graduate Institute of Molecular Medicine, National Taiwan University, Taipei, Taiwan; Graduate Institute of Clinical Medicine, College of Medicine, National Taiwan University, Taipei, Taiwan; Institute of Epidemiology and Preventive Medicine, College of Public Health, National Taiwan University, Taipei, Taiwan
| | - Tien-Jyun Chang
- Department of Internal Medicine, National Taiwan University Hospital, Taipei, Taiwan; School of Medicine, National Taiwan University, Taipei, Taiwan.
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Wu H, Wang H, Sun L, Liu M, Wang H, Sun X, Zhang W. Association Between rs2278426 Polymorphism of the ANGPTL8 Gene and Polycystic Ovary Syndrome. Diabetes Metab Syndr Obes 2024; 17:1749-1760. [PMID: 38645655 PMCID: PMC11032162 DOI: 10.2147/dmso.s455274] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/17/2024] [Accepted: 04/08/2024] [Indexed: 04/23/2024] Open
Abstract
Purpose To study the relationship between the single nucleotide polymorphism (SNP) rs2278426 in the angiopoietin-like protein 8 gene (ANGPTL8) and polycystic ovary syndrome (PCOS). Patients and methods A total of 122 patients with PCOS and 108 controls were recruited for comparison of glucose, lipid, insulin, sex hormone, and ANGPTL8 levels. Polymerase chain reaction (PCR) and gene sequencing were performed for comparison of the frequency of the CC, CT, and TT rs2278426 genotypes and the rs2278426 allele distributions between the PCOS and control groups and between the obese and non-obese subgroups of the PCOS and control groups. Results The frequency of the T allele was significantly higher in the PCOS group than that in the controls (P = 0.037). In the dominant genetic model, the proportion of the CT+TT genotype in the PCOS group was significantly higher than that in the controls (P = 0.047). Subgroup analysis demonstrated that the T allele proportion was significantly higher in obese PCOS group than obese control group (P = 0.027). PCOS with the CT+TT genotype had significantly higher body mass index (BMI; P = 0.001), triglyceride (TG; P = 0.005), homeostasis model assessment of insulin resistance (HOMA-IR; P = 0.035), testosterone (P = 0.041), and ANGPTL8 (P = 0.037) levels and significantly lower high-density lipoprotein (HDL) levels (P = 0.025) than PCOS with the CC genotype. Obese PCOS group with the CT+TT genotype had significantly higher TG (P = 0.015), luteinizing hormone (LH; P = 0.030), fasting insulin (FINS; P = 0.039), HOMA-IR (P = 0.018), and ANGPTL8 (P = 0.049) levels than obese PCOS group with the CC genotype. Conclusion Polymorphisms of rs2278426 may induce glycolipid metabolic disorders by affecting ANGPTL8 levels and functions in Han Chinese females with obesity from the Shandong region, increasing the risk of PCOS in this population.
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Affiliation(s)
- Han Wu
- Center for Reproductive Medicine, The Second Affiliated Hospital of Shandong First Medical University, Taian, 271000, People’s Republic of China
| | - Hui Wang
- Gynecological Minimally Invasive Surgery Center, The Affiliated Taian City Central Hospital of Qingdao University, Taian, 271000, People’s Republic of China
| | - Lixia Sun
- Department of Hematology, The Affiliated Taian City Central Hospital of Qingdao University, Taian, 271000, People’s Republic of China
| | - Mengchen Liu
- Center for Reproductive Medicine, The Second Affiliated Hospital of Shandong First Medical University, Taian, 271000, People’s Republic of China
| | - Haoran Wang
- Center for Reproductive Medicine, The Second Affiliated Hospital of Shandong First Medical University, Taian, 271000, People’s Republic of China
| | - Xianchang Sun
- Department of Physiology, Shandong First Medical University & Shandong Academy of Medical Sciences, Jinan, 250117, People’s Republic of China
| | - Wenjuan Zhang
- Center for Reproductive Medicine, The Second Affiliated Hospital of Shandong First Medical University, Taian, 271000, People’s Republic of China
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Ghosh A, Leung YH, Yu J, Sladek R, Chénier I, Oppong AK, Peyot ML, Madiraju SRM, Al-Khairi I, Thanaraj TA, Abubaker J, Al-Mulla F, Prentki M, Abu-Farha M. Silencing ANGPTL8 reduces mouse preadipocyte differentiation and insulin signaling. Biochim Biophys Acta Mol Cell Biol Lipids 2024; 1869:159461. [PMID: 38272177 DOI: 10.1016/j.bbalip.2024.159461] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/04/2023] [Revised: 01/12/2024] [Accepted: 01/19/2024] [Indexed: 01/27/2024]
Abstract
ANGPTL8, expressed mainly in the liver and adipose tissue, regulates the activity of lipoprotein lipase (LPL) present in the extracellular space and triglyceride (TG) metabolism through its interaction with ANGPTL3 and ANGPTL4. Whether intracellular ANGPTL8 can also exert effects in tissues where it is expressed is uncertain. ANGPTL8 expression was low in preadipocytes and much increased during differentiation. To better understand the role of intracellular ANGPTL8 in adipocytes and assess whether it may play a role in adipocyte differentiation, we knocked down its expression in normal mouse subcutaneous preadipocytes. ANGPTL8 knockdown reduced adipocyte differentiation, cellular TG accumulation and also isoproterenol-stimulated lipolysis at day 7 of differentiation. RNA-Seq analysis of ANGPTL8 siRNA or control siRNA transfected SC preadipocytes on days 0, 2, 4 and 7 of differentiation showed that ANGPTL8 knockdown impeded the early (day 2) expression of adipogenic and insulin signaling genes, PPARγ, as well as genes related to extracellular matrix and NF-κB signaling. Insulin mediated Akt phosphorylation was reduced at an early stage during adipocyte differentiation. This study based on normal primary cells shows that ANGPTL8 has intracellular actions in addition to effects in the extracellular space, like modulating LPL activity. Preadipocyte ANGPTL8 expression modulates their differentiation possibly via changes in insulin signaling gene expression.
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Affiliation(s)
- Anindya Ghosh
- Departments of Nutrition, Biochemistry and Molecular Medicine, University of Montreal, and Montreal Diabetes Research Center, Centre de Recherche du Centre Hospitalier de l'Université de Montréal (CRCHUM), Montréal, QC, Canada
| | - Yat Hei Leung
- Departments of Nutrition, Biochemistry and Molecular Medicine, University of Montreal, and Montreal Diabetes Research Center, Centre de Recherche du Centre Hospitalier de l'Université de Montréal (CRCHUM), Montréal, QC, Canada
| | - Jeffrey Yu
- Department of Medicine, McGill University, Montréal, QC, Canada
| | - Robert Sladek
- Department of Medicine, McGill University, Montréal, QC, Canada
| | - Isabelle Chénier
- Departments of Nutrition, Biochemistry and Molecular Medicine, University of Montreal, and Montreal Diabetes Research Center, Centre de Recherche du Centre Hospitalier de l'Université de Montréal (CRCHUM), Montréal, QC, Canada
| | - Abel K Oppong
- Departments of Nutrition, Biochemistry and Molecular Medicine, University of Montreal, and Montreal Diabetes Research Center, Centre de Recherche du Centre Hospitalier de l'Université de Montréal (CRCHUM), Montréal, QC, Canada
| | - Marie-Line Peyot
- Departments of Nutrition, Biochemistry and Molecular Medicine, University of Montreal, and Montreal Diabetes Research Center, Centre de Recherche du Centre Hospitalier de l'Université de Montréal (CRCHUM), Montréal, QC, Canada
| | - S R Murthy Madiraju
- Departments of Nutrition, Biochemistry and Molecular Medicine, University of Montreal, and Montreal Diabetes Research Center, Centre de Recherche du Centre Hospitalier de l'Université de Montréal (CRCHUM), Montréal, QC, Canada
| | | | | | | | | | - Marc Prentki
- Departments of Nutrition, Biochemistry and Molecular Medicine, University of Montreal, and Montreal Diabetes Research Center, Centre de Recherche du Centre Hospitalier de l'Université de Montréal (CRCHUM), Montréal, QC, Canada.
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Arikan FB, Ulas M, Ustundag Y, Boyunaga H, Badem ND. Investigation of the relationship between betatrophin and certain key enzymes involved in carbohydrate and lipid metabolism in insulin-resistant mice. Horm Mol Biol Clin Investig 2023; 44:311-320. [PMID: 36869875 DOI: 10.1515/hmbci-2022-0104] [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: 11/15/2022] [Accepted: 02/08/2023] [Indexed: 03/05/2023]
Abstract
OBJECTIVES The present study sought to examine the relationship of betatrophin with certain key enzymes, namely lactate dehydrogenase-5 (LDH5), citrate synthase (CS), and acetyl-CoA carboxylase-1 (ACC1), in insulin-resistant mice. METHODS Eight-week-old male C57BL6/J mice were used in this study (experimental group n=10 and control group n=10). S961 was administered using an osmotic pump to induce insulin resistance in the mice. The betatrophin, LDH5, CS, and ACC1 expression levels were determined from the livers of the mice using the real-time polymerase chain reaction (RT-PCR) method. Moreover, biochemical parameters such as the serum betatrophin, fasting glucose, insulin, triglyceride, total cholesterol, and high-density lipoprotein (HDL) and low-density lipoprotein (LDL) cholesterol levels were analyzed. RESULTS The betatrophin expression and serum betatrophin (p=0.000), fasting glucose, insulin, triglyceride (p≤0.001), and total cholesterol (p=0.013) levels were increased in the experimental group. In addition, the CS gene expression level was statistically significantly decreased in the experimental group (p=0.01). Although strong correlation was found between the expression and serum betatrophin and triglyceride levels, no correlation was found between the betatrophin gene expression and the LDH5, ACC1, and CS gene expression levels. CONCLUSIONS The betatrophin level appears to play an important role in the regulation of triglyceride metabolism, while insulin resistance increases both the betatrophin gene expression and serum levels and decreases the CS expression level. The findings suggest that betatrophin may not regulate carbohydrate metabolism through CS and LDH5 or lipid metabolism directly through the ACC1 enzyme.
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Affiliation(s)
- Funda Bulut Arikan
- Faculty of Medicine, Department of Physiology, Kırıkkale University, Kırıkkale, Türkiye
| | - Mustafa Ulas
- Faculty of Medicine, Department of Physiology, Fırat University, Elazığ, Türkiye
| | - Yasemin Ustundag
- Faculty of Veterinary, Department of Anatomy, Dokuz Eylul University, Izmir, Türkiye
| | - Hakan Boyunaga
- Faculty of Medicine, Medical Biochemistry Department, Medipol University, Ankara, Türkiye
| | - Nermin Dindar Badem
- Department of Medical Biochemistry, Health Sciences University, Gülhane Training and Research Hospital, Ankara, Türkiye
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Gao Y, Yuan Y, Wen S, Chen Y, Zhang Z, Feng Y, Jiang B, Ma S, Hu R, Fang C, Ruan X, Yuan Y, Fang X, Luo C, Meng Z, Wang X, Guo X. Dual role of ANGPTL8 in promoting tumor cell proliferation and immune escape during hepatocarcinogenesis. Oncogenesis 2023; 12:26. [PMID: 37188659 DOI: 10.1038/s41389-023-00473-3] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/24/2022] [Revised: 04/19/2023] [Accepted: 04/25/2023] [Indexed: 05/17/2023] Open
Abstract
The interplay between hepatocellular carcinoma (HCC) cells and the tumor microenvironment is essential for hepatocarcinogenesis, but their contributions to HCC development are incompletely understood. We assessed the role of ANGPTL8, a protein secreted by HCC cells, in hepatocarcinogenesis and the mechanisms through which ANGPTL8 mediates crosstalk between HCC cells and tumor-associated macrophages. Immunohistochemical, Western blotting, RNA-Seq, and flow cytometry analyses of ANGPTL8 were performed. A series of in vitro and in vivo experiments were conducted to reveal the role of ANGPTL8 in the progression of HCC. ANGPTL8 expression was positively correlated with tumor malignancy in HCC, and high ANGPTL8 expression was associated with poor overall survival (OS) and disease-free survival (DFS). ANGPTL8 promoted HCC cell proliferation in vitro and in vivo, and ANGPTL8 KO inhibited the development of HCC in both DEN-induced and DEN-plus-CCL4-induced mouse HCC tumors. Mechanistically, the ANGPTL8-LILRB2/PIRB interaction promoted polarization of macrophages to the immunosuppressive M2 phenotype in macrophages and recruited immunosuppressive T cells. In hepatocytes, ANGPTL8-mediated stimulation of LILRB2/PIRB regulated the ROS/ERK pathway and upregulated autophagy, leading to the proliferation of HCC cells. Our data support the notion that ANGPTL8 has a dual role in promoting tumor cell proliferation and immune escape during hepatocarcinogenesis.
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Affiliation(s)
- Yujiu Gao
- Department of Critical Care Medicine, Hubei Key Laboratory of Embryonic Stem Cell Research, School of Basic Medical Sciences, Taihe Hospital, Hubei University of Medicine, 442000, Shiyan, China
- Department of Nephrology, Taihe Hospital, 442000, Shiyan, China
- Hubei Clinical Research Center for Umbilical Cord Blood Hematopoietic Stem Cells, Taihe Hospital, 442000, Shiyan, China
| | - Yue Yuan
- Department of Critical Care Medicine, Hubei Key Laboratory of Embryonic Stem Cell Research, School of Basic Medical Sciences, Taihe Hospital, Hubei University of Medicine, 442000, Shiyan, China
- College of Pharmacy, Hubei University of Medicine, 442000, Shiyan, China
- Department of Anesthesiology, Renmin Hospital of Wuhan University, 430060, Wuhan, China
| | - Shu Wen
- Department of Critical Care Medicine, Hubei Key Laboratory of Embryonic Stem Cell Research, School of Basic Medical Sciences, Taihe Hospital, Hubei University of Medicine, 442000, Shiyan, China
| | - Yanghui Chen
- Department of Critical Care Medicine, Hubei Key Laboratory of Embryonic Stem Cell Research, School of Basic Medical Sciences, Taihe Hospital, Hubei University of Medicine, 442000, Shiyan, China
| | - Zongli Zhang
- Institute of Pediatric Disease, Taihe Hospital, 442000, Shiyan, China
| | - Ying Feng
- Department of Critical Care Medicine, Hubei Key Laboratory of Embryonic Stem Cell Research, School of Basic Medical Sciences, Taihe Hospital, Hubei University of Medicine, 442000, Shiyan, China
| | - Bin Jiang
- Department of Hepatobiliary Pancreatic Surgery, Taihe Hospital, 442000, Shiyan, China
| | - Shinan Ma
- Department of Critical Care Medicine, Hubei Key Laboratory of Embryonic Stem Cell Research, School of Basic Medical Sciences, Taihe Hospital, Hubei University of Medicine, 442000, Shiyan, China
| | - Rong Hu
- Department of Critical Care Medicine, Hubei Key Laboratory of Embryonic Stem Cell Research, School of Basic Medical Sciences, Taihe Hospital, Hubei University of Medicine, 442000, Shiyan, China
| | - Chen Fang
- Department of Critical Care Medicine, Hubei Key Laboratory of Embryonic Stem Cell Research, School of Basic Medical Sciences, Taihe Hospital, Hubei University of Medicine, 442000, Shiyan, China
| | - Xuzhi Ruan
- Department of Critical Care Medicine, Hubei Key Laboratory of Embryonic Stem Cell Research, School of Basic Medical Sciences, Taihe Hospital, Hubei University of Medicine, 442000, Shiyan, China
| | - Yahong Yuan
- Department of Critical Care Medicine, Hubei Key Laboratory of Embryonic Stem Cell Research, School of Basic Medical Sciences, Taihe Hospital, Hubei University of Medicine, 442000, Shiyan, China
| | - Xinggang Fang
- Department of Critical Care Medicine, Hubei Key Laboratory of Embryonic Stem Cell Research, School of Basic Medical Sciences, Taihe Hospital, Hubei University of Medicine, 442000, Shiyan, China
| | - Chao Luo
- Department of Critical Care Medicine, Hubei Key Laboratory of Embryonic Stem Cell Research, School of Basic Medical Sciences, Taihe Hospital, Hubei University of Medicine, 442000, Shiyan, China
| | - Zhongji Meng
- Department of Infectious Diseases, Institute of Biomedical Research, Hubei Clinical Research Center for Precise Diagnosis and Treatment of Liver Cancer, Taihe Hospital, 442000, Shiyan, China.
| | - Xiaoli Wang
- Department of Critical Care Medicine, Hubei Key Laboratory of Embryonic Stem Cell Research, School of Basic Medical Sciences, Taihe Hospital, Hubei University of Medicine, 442000, Shiyan, China.
- Hubei Clinical Research Center for Umbilical Cord Blood Hematopoietic Stem Cells, Taihe Hospital, 442000, Shiyan, China.
| | - Xingrong Guo
- Department of Critical Care Medicine, Hubei Key Laboratory of Embryonic Stem Cell Research, School of Basic Medical Sciences, Taihe Hospital, Hubei University of Medicine, 442000, Shiyan, China.
- Hubei Clinical Research Center for Umbilical Cord Blood Hematopoietic Stem Cells, Taihe Hospital, 442000, Shiyan, China.
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Pérez-López FR, Yuan J, Sánchez-Prieto M, López-Baena MT, Pérez-Roncero GR, Varikasuvu SR. Maternal and cord blood betatrophin (angiopoietin-like protein 8) in pregnant women with gestational diabetes and normoglycemic controls: A systematic review, meta-analysis, and meta-regression. Diabetes Metab Res Rev 2023; 39:e3612. [PMID: 36656279 DOI: 10.1002/dmrr.3612] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/25/2022] [Revised: 11/15/2022] [Accepted: 01/13/2023] [Indexed: 01/20/2023]
Abstract
AIMS This systematic review and meta-analysis examined maternal and cord blood betatrophin levels in pregnant women with gestational diabetes mellitus (GDM) and normoglycemic controls. MATERIAL AND METHODS PubMed, Cochrane Library, Embase, LILACS, WangFang, and China National Knowledge Infrastructure were searched for literature from inception until May 2022. The primary outcomes were maternal and cord blood betatrophin levels. A random-effect meta-analysis was used to estimate the pooled results. The mean differences (MDs) or standardised MDs (SMD) and their 95% confidence intervals (CIs) were calculated. I2 tests were used to evaluate the heterogeneity. The quality of studies was evaluated using the Newcastle-Ottawa Scale. RESULTS Betatrophin levels were reported in 22 studies with a total of 3034 pregnant women, and in seven studies including cord blood from 456 infants. Women with GDM display higher betatrophin levels than the normoglycemic controls (SMD = 0.85, 95% CI: 0.38-1.31) during the second half of the pregnancy. The sensitivity analysis indicated that no single study had significantly influenced the betatrophin overall outcomes. There was heterogeneity between the studies as evidenced by high I2 values. Meta-regression analysis indicated a significant regression coefficient for maternal betatrophin and glycosilated haemoglobin. There was no significant difference in cord blood betatrophin in infants from women with and without GDM (SMD = 0.34, 95% CI: -0.15-0.83). Women with GDM also had significantly higher insulin, glucose, glycosylated haemoglobin, HOMA-IR, LDL-cholesterol, HDL-cholesterol, triglycerides, and body mass index compared with the normoglycemic controls. CONCLUSIONS Maternal betatrophin levels were higher in women with GDM than in the normoglycemic controls. There was no difference in cord blood betatrophin. SYSTEMATIC REVIEW REGISTRATION PROSPERO CRD42022311372.
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Affiliation(s)
- Faustino R Pérez-López
- Faculty of Medicine, University of Zaragoza, Zaragoza, Spain
- Aragón Health Research Institute, Zaragoza, Spain
| | - Junhua Yuan
- Special Medicine Department, School of Basic Medicine, Qingdao University, Qingado, China
| | - Manuel Sánchez-Prieto
- Department of Obstetrics and Gynecology, Dexeus University Hospital, Barcelona, Spain
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Betatrophin and Insulin Resistance. Metabolites 2022; 12:metabo12100925. [PMID: 36295827 PMCID: PMC9610572 DOI: 10.3390/metabo12100925] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/10/2022] [Revised: 09/09/2022] [Accepted: 09/24/2022] [Indexed: 11/18/2022] Open
Abstract
Betatrophin (angiopoietin-like protein 8 (ANGPTL8)) is a hormone that was recently discovered in the human liver. Multiple homologous sequences have been detected in mammalian liver, white adipose, and brown adipose tissues. Betatrophin is crucial for the development of type 2 diabetes (T2D), insulin resistance, and lipid metabolism. Similar to the intake of insulin, thyroid hormones, irisin, and calories, betatrophin expression in the organism is usually attributed to energy consumption or heat generation. It can mediate the activity of lipoprotein lipase (LPL), which is the key enzyme of lipoprotein lipolysis. Due to its association with metabolic markers and the roles of glucose and lipid, the physiological function of betatrophin in glucose homeostasis and lipid metabolism can be more comprehensively understood. Betatrophin was also shown to facilitate pancreatic β-cell proliferation in a mouse model of insulin resistance. There are also reports that demonstrate that betatrophin regulates triglycerides (TGs) in the liver. Therefore, the process of regulating the physiological function by betatrophin is complicated, and its exact biological significance remains elusive. This study provides a comprehensive review of the current research, and it discusses the possible physiological functions of betatrophin, and specifically the mechanism of betatrophin in regulating blood glucose and blood lipids.
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Zhao Z, Deng X, Jia J, Zhao L, Wang C, Cai Z, Guo C, Yang L, Wang D, Ma S, Deng J, Li H, Zhou L, Tu Z, Yuan G. Angiopoietin-like protein 8 (betatrophin) inhibits hepatic gluconeogenesis through PI3K/Akt signaling pathway in diabetic mice. Metabolism 2022; 126:154921. [PMID: 34715116 DOI: 10.1016/j.metabol.2021.154921] [Citation(s) in RCA: 8] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/02/2021] [Revised: 10/15/2021] [Accepted: 10/21/2021] [Indexed: 02/06/2023]
Abstract
BACKGROUND & AIMS Angiopoietin-like protein 8 (ANGPTL8) is a 198 amino-acid long, novel secreted protein that is mainly expressed in the liver and brown adipose tissues. At present, evidence supporting the involvement of ANGPTL8 in the regulation of glucose metabolism is inconclusive, along with its function in the liver. Previous studies mainly focused on the effect of ANGPTL8 on glucose metabolism in non-diabetic mice, and few relevant studies in diabetic mice exist. Therefore, this study aimed to investigate the role of ANGPTL8 on glucose homeostasis and elucidate the underlying mechanisms in diabetic mice. METHODS db/db diabetic and high-fat diet/streptozotocin-induced diabetic mice were injected with adenovirus expressing ANGPTL8 through the tail vein. Blood glucose levels were measured and glucose, insulin, and pyruvate tolerance tests were performed. To explore the molecular mechanism by which ANGPTL8 regulates hepatic glucose metabolism and manipulate mouse ANGPTL8 expression levels both in vivo and in vitro based on adenoviral transduction, gain- and loss-of-function strategies were adopted. RESULTS Adenovirus-mediated overexpression of ANGPTL8 decreased fasting blood glucose levels and improved glucose tolerance and insulin sensitivity in db/db and high-fat diet/streptozotocin-induced diabetic mice. ANGPTL8 knockdown yielded the opposite effects. ANGPTL8 was upregulated in the cAMP/Dex-induced hepatocyte gluconeogenesis model. Moreover, ANGPTL8 overexpression in primary hepatocytes and diabetic mouse livers inhibited the expression of gluconeogenesis-related genes, including PEPCK and G6PC, by activating the AKT signaling pathway and, thereby, reducing glucose production. Therefore, the results demonstrated that ANGPTL8 improved glucose metabolism via inhibition of hepatic gluconeogenesis in diabetic mice. CONCLUSIONS Current findings highlight a critical role of hepatic ANGPTL8 in glucose homeostasis, suggesting that increased ANGPTL8 expression could be an underlying factor for the inhibition of hepatic gluconeogenesis, which could be targeted for the prevention and treatment of type 2 diabetes.
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Affiliation(s)
- Zhicong Zhao
- Department of Endocrinology, Affiliated Hospital of Jiangsu University, Zhenjiang, Jiangsu 212031, China
| | - Xia Deng
- Department of Endocrinology, Affiliated Hospital of Jiangsu University, Zhenjiang, Jiangsu 212031, China
| | - Jue Jia
- Department of Endocrinology, Affiliated Hospital of Jiangsu University, Zhenjiang, Jiangsu 212031, China
| | - Li Zhao
- Department of Endocrinology, Affiliated Hospital of Jiangsu University, Zhenjiang, Jiangsu 212031, China
| | - Chenxi Wang
- Department of Endocrinology, Affiliated Hospital of Jiangsu University, Zhenjiang, Jiangsu 212031, China
| | - Zhensheng Cai
- Department of Endocrinology, Affiliated Hospital of Jiangsu University, Zhenjiang, Jiangsu 212031, China
| | - Chang Guo
- Department of Endocrinology, Affiliated Hospital of Jiangsu University, Zhenjiang, Jiangsu 212031, China
| | - Ling Yang
- Department of Endocrinology, Affiliated Hospital of Jiangsu University, Zhenjiang, Jiangsu 212031, China
| | - Dong Wang
- Department of Endocrinology, Affiliated Hospital of Jiangsu University, Zhenjiang, Jiangsu 212031, China
| | - Suxian Ma
- Department of Endocrinology, Suzhou Municipal Hospital, Suzhou, Jiangsu 215002, China
| | - Jialiang Deng
- Department of Rheumatology and Immunology, Affiliated Hospital of Jiangsu University, Zhenjiang, Jiangsu 212031, China
| | - Haoxiang Li
- Department of Endocrinology, Affiliated Hospital of Jiangsu University, Zhenjiang, Jiangsu 212031, China
| | - Libin Zhou
- Shanghai Institute of Endocrine and Metabolic Diseases, Department of Endocrine and Metabolic Diseases, Shanghai Clinical Center for Endocrine and Metabolic Diseases, Ruijin Hospital, Shanghai Jiaotong University School of Medicine, Shanghai 200025, China.
| | - Zhigang Tu
- School of Life Sciences, Jiangsu University, Zhenjiang, Jiangsu 212013, China.
| | - Guoyue Yuan
- Department of Endocrinology, Affiliated Hospital of Jiangsu University, Zhenjiang, Jiangsu 212031, China.
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Navaeian M, Ahmadpour-Yazdi H, Asadian S, Gheibi N. The effect of ANGPTL8 protein on proliferation and apoptosis in HepG2 hepatocellular carcinoma cell line. GENE REPORTS 2021. [DOI: 10.1016/j.genrep.2021.101306] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
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Xu F, Tian D, Shi X, Sun K, Chen Y. Analysis of the Expression and Prognostic Potential of a Novel Metabolic Regulator ANGPTL8/Betatrophin in Human Cancers. Pathol Oncol Res 2021; 27:1609914. [PMID: 34646087 PMCID: PMC8502826 DOI: 10.3389/pore.2021.1609914] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/10/2021] [Accepted: 09/13/2021] [Indexed: 12/04/2022]
Abstract
The angiopoietin-like protein (ANGPTL) family members, except for the novel atypical member ANGPTL8/betatrophin, have been reported to participate in angiogenesis, inflammation and cancer. ANGPTL8/betatrophin is a metabolic regulator that is involved in lipid metabolism and glucose homeostasis. However, little is known about the expression and prognostic value of ANGPTL8/betatrophin in human cancers. In this study, we first conducted detailed analyses of ANGPTL8/betatrophin expression in cancer/normal samples via the Human Protein Atlas (HPA), Gene Expression Profiling Interactive Analysis (GEPIA), DriverDBv3, ENCORI and UALCAN databases. ANGPTL8/betatrophin showed high tissue specificity (enriched in the liver) and cell-type specificity (enriched in HepG2 and MCF7 cell lines). More than one databases demonstrated that the gene expression of ANGPTL8/betatrophin was significantly lower in cholangiocarcinoma (CHOL), breast invasive carcinoma (BRCA), lung adenocarcinoma (LUAD), lung squamous cell carcinoma (LUSC), uterine corpus endometrial carcinoma (UCEC), and significantly higher in kidney renal clear cell carcinoma (KIRC) compared with that in normal samples. However, the protein expression of ANGPTL8/betatrophin displayed opposite results in clear cell renal cell carcinoma (ccRCC)/KIRC. Based on the expression profiles, the prognostic value was evaluated with the GEPIA, DriverDBv3, Kaplan Meier plotter and ENCORI databases. Two or more databases demonstrated that ANGPTL8/betatrophin significantly affected the survival of KIRC, uterine corpus endometrial carcinoma (UCEC), pheochromocytoma and paraganglioma (PCPG) and sarcoma (SARC); patients with PCPG and SARC may benifit from high ANGPTL8/betatrophin expression while high ANGPTL8/betatrophin expression was associated with poor prognosis in KIRC and UCEC. Functional analyses with the GeneMANIA, Metascape and STRING databases suggested that ANGPTL8/betatrophin was mainly involved in lipid homeostasis, especially triglyceride and cholesterol metabolism; glucose homeostasis, especially insulin resistance; AMPK signaling pathway; PI3K/Akt signaling pathway; PPAR signaling pathway; mTOR signaling pathway; HIF-1 signaling pathway; autophagy; regulation of inflammatory response. ANGPTL8/betatrophin may be a promising prognostic biomarker and therapeutic target, thus providing evidence to support further exploration of its role in defined human cancers.
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Affiliation(s)
- Fangfang Xu
- Clinical Medical Research Center, Henan Provincial People's Hospital and Zhengzhou University People's Hospital, Zheng Zhou, China
| | - Dandan Tian
- Department of Hypertension, Henan Provincial People's Hospital and Zhengzhou University People's Hospital, Zheng Zhou, China
| | - Xiaoyang Shi
- Department of Endocrinology, Henan Provincial People's Hospital and Zhengzhou University People's Hospital, Zheng Zhou, China
| | - Kai Sun
- Department of Hematology, Henan Provincial People's Hospital and Zhengzhou University People's Hospital, Zheng Zhou, China
| | - Yuqing Chen
- Department of Hematology, Henan Provincial People's Hospital and Zhengzhou University People's Hospital, Zheng Zhou, China
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Li M, Fan R, Peng X, Huang J, Zou H, Yu X, Yang Y, Shi X, Ma D. Association of ANGPTL8 and Resistin With Diabetic Nephropathy in Type 2 Diabetes Mellitus. Front Endocrinol (Lausanne) 2021; 12:695750. [PMID: 34603198 PMCID: PMC8479106 DOI: 10.3389/fendo.2021.695750] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/15/2021] [Accepted: 08/30/2021] [Indexed: 12/22/2022] Open
Abstract
Background Previous studies showed altered angiopoietin-like protein-8 (ANGPTL-8) and resistin circulating levels in type 2 diabetes mellitus (T2DM). Whether or not the alteration in ANGPTL-8 and resistin level can be a predictive maker for increased diabetic nephropathy risk remains unclear. Aim To Investigate the possible association of ANGPTL-8 and resistin with DN, and whether this association is affected by NAFLD status. Methods A total of 278 T2DM patients were enrolled. Serum levels of ANGPTL8, resistin, BMI, blood pressure, duration of diabetes, glycosylated hemoglobin (HbA1c), fasting blood glucose (FPG), hypersensitive C-reactive protein (hs-CRP), lipid profile, liver, and kidney function tests were assessed. The relationship between DN with ANGPTL8 and resistin was analyzed in the unadjusted and multiple-adjusted regression models. Results Serum levels of ANGPTL8 and resistin were significantly higher in DN compared with T2DM subjects without DN (respectively; P <0.001), especially in non-NAFLD populations. ANGPTL8 and resistin showed positive correlation with hs-CRP (respectively; P<0.01), and negative correlation with estimated GFR (eGFR) (respectively; P=<0.001) but no significant correlation to HOMA-IR(respectively; P>0.05). Analysis showed ANGPTL8 levels were positively associated with resistin but only in T2DM patients with DN(r=0.1867; P<0.05), and this significant correlation disappeared in T2DM patients without DN. After adjusting for confounding factors, both ANGPTL8(OR=2.095, 95%CI 1.253-3.502 P=0.005) and resistin (OR=2.499, 95%CI 1.484-4.208 P=0.001) were risk factors for DN. Data in non-NAFLD population increased the relationship between ANGPTL8 (OR=2.713, 95% CI 1.494-4.926 P=0.001), resistin (OR=4.248, 95% CI 2.260-7.987 P<0.001)and DN. The area under the curve (AUC) on receiver operating characteristic (ROC) analysis of the combination of ANGPTL8 and resistin was 0.703, and the specificity was 70.4%. These data were also increased in non-NAFLD population, as the AUC (95%CI) was 0.756, and the specificity was 91.2%. Conclusion This study highlights a close association between ANGPTL8, resistin and DN, especially in non-NAFLD populations. These results suggest that ANGPTL-8 and resistin may be risk predictors of DN.
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Affiliation(s)
- Mengni Li
- Department of Endocrinology, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China
| | - Rongping Fan
- Department of Endocrinology, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China
| | - Xuemin Peng
- Department of Endocrinology, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China
| | - Jiaojiao Huang
- Department of Endocrinology, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China
| | - Huajie Zou
- Department of Endocrinology, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China
| | - Xuefeng Yu
- Department of Endocrinology, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China
- Wuhan Branch of National Clinical Research Center for Metabolic Diseases, Wuhan, China
| | - Yan Yang
- Department of Endocrinology, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China
- Wuhan Branch of National Clinical Research Center for Metabolic Diseases, Wuhan, China
| | - Xiaoli Shi
- Department of Endocrinology, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China
- Wuhan Branch of National Clinical Research Center for Metabolic Diseases, Wuhan, China
| | - DeLin Ma
- Department of Endocrinology, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China
- Wuhan Branch of National Clinical Research Center for Metabolic Diseases, Wuhan, China
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Abstract
ANGPTL8 is an important cytokine, which is significantly increased in type 2 diabetes mellitus (T2DM), obesity and metabolic syndrome. Many studies have shown that ANGPTL8 can be used as a bio-marker of these metabolic disorders related diseases, and the baseline ANGPTL8 level has also been found to be positively correlated with retinopathy and all-cause mortality in patients with T2DM. This may be related to the inhibition of lipoprotein lipase activity and the reduction of circulating triglyceride (TG) clearance by ANGPTL8. Consistently, inhibition of ANGPTL8 seems to prevent or improve atherosclerosis. However, it is puzzling that ANGPTL8 seems to have a directing function for TG uptake in peripheral tissues; that is, ANGPTL8 specifically enhances the reserve and buffering function of white adipose tissue, which may alleviate the ectopic lipid accumulation to a certain extent. Furthermore, ANGPTL8 can improve insulin sensitivity and inhibit hepatic glucose production. These contradictory results lead to different opinions on the role of ANGPTL8 in metabolic disorders. In this paper, the correlation between ANGPTL8 and metabolic diseases, the regulation of ANGPTL8 and the physiological role of ANGPTL8 in the process of glucose and lipid metabolism were summarized, and the physiological/pathological significance of ANGPTL8 in the process of metabolic disorder was discussed.
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Affiliation(s)
- Chang Guo
- Department of Nephrology, Affiliated Hospital of Jiangsu University, 438 Jiefang Road, Zhenjiang 212001, Jiangsu, People's Republic of China
| | - Chenxi Wang
- Department of Endocrinology, Affiliated Hospital of Jiangsu University, 438 Jiefang Road, Zhenjiang 212001, Jiangsu, People's Republic of China
| | - Xia Deng
- Department of Endocrinology, Affiliated Hospital of Jiangsu University, 438 Jiefang Road, Zhenjiang 212001, Jiangsu, People's Republic of China
| | - Jianqiang He
- Department of Nephrology, Affiliated Hospital of Jiangsu University, 438 Jiefang Road, Zhenjiang 212001, Jiangsu, People's Republic of China
| | - Ling Yang
- Department of Endocrinology, Affiliated Hospital of Jiangsu University, 438 Jiefang Road, Zhenjiang 212001, Jiangsu, People's Republic of China
| | - Guoyue Yuan
- Department of Endocrinology, Affiliated Hospital of Jiangsu University, 438 Jiefang Road, Zhenjiang 212001, Jiangsu, People's Republic of China
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Hao Q, Zheng A, Zhang H, Cao H. Down-regulation of betatrophin enhances insulin sensitivity in type 2 diabetes mellitus through activation of the GSK-3β/PGC-1α signaling pathway. J Endocrinol Invest 2021; 44:1857-1868. [PMID: 33464548 DOI: 10.1007/s40618-020-01493-1] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/08/2020] [Accepted: 12/23/2020] [Indexed: 12/23/2022]
Abstract
OBJECTIVE The incidence of type 2 diabetes mellitus (T2DM) among children and adolescents has been rising. Accumulating evidences have noted the significant role of betatrophin in the regulation of lipid metabolism and glucose homeostasis. In our study, we tried to figure out the underlying mechanism of betatrophin in insulin resistance (IR) in type 2 diabetes mellitus (T2DM). METHODS First, fasting serum betatrophin, fasting blood glucose (FBG), insulin, total cholesterol (TC), triglyceride (TG), and low-density lipoprotein cholesterol (LDL-C) were detected in T2DM children. The homeostasis model assessment of insulin resistance (HOMA-IR), Gutt insulin sensitivity index (ISIG) and Matsuda insulin sensitivity index (ISIM) were calculated. A T2DM-IR mouse model was induced by high-fat diet, with the expression of GSK-3β and PGC-1α detected. Besides, HepG2 cells were induced by a high concentration of insulin to establish an IR cell model (HepG2-IR). The cell viability, glucose consumption, liver glycogen content, inflammation, and fluorescence level of GSK-3β and PGC-1α were analyzed. RESULTS Betatrophin was highly expressed in serum of T2DM children and was positively correlated with FBG, insulin, TC, TG, LDL-C and HOMA-IR, while negatively correlated with ISIG and ISIM. Betatrophin and GSK-3β in the liver tissues of T2DM-IR mice were increased, while the PGC-1α expression was decreased. Betatrophin expression was negatively correlated with PGC-1α and positively correlated with GSK-3β. Silencing of betatrophin enhanced insulin sensitivity through the activation of GSK-3β/PGC-1α signaling pathway. In vitro experiments also found that silencing of betatrophin promoted glucose consumption and glycogen synthesis while inhibited inflammation. CONCLUSION Our findings concluded that silencing of betatrophin could enhance insulin sensitivity and improve histopathological morphology through the activation of GSK-3β/PGC-1α signaling pathway.
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Affiliation(s)
- Q Hao
- Department of Endocrinology, The First People's Hospital of Shangqiu, No.292 Kaixuan South Road, Shangqiu, 476100, Henan, People's Republic of China
| | - A Zheng
- College of Biology and Food, Shangqiu Normal University, Shangqiu, 476000, Henan, People's Republic of China
| | - H Zhang
- Department of Endocrinology, The First People's Hospital of Shangqiu, No.292 Kaixuan South Road, Shangqiu, 476100, Henan, People's Republic of China
| | - H Cao
- Department of Endocrinology, The First People's Hospital of Shangqiu, No.292 Kaixuan South Road, Shangqiu, 476100, Henan, People's Republic of China.
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14
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Yeoh SG, Sum JS, Lai JY, W Isa WYH, Lim TS. Potential of Phage Display Antibody Technology for Cardiovascular Disease Immunotherapy. J Cardiovasc Transl Res 2021; 15:360-380. [PMID: 34467463 DOI: 10.1007/s12265-021-10169-x] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/30/2021] [Accepted: 08/22/2021] [Indexed: 11/26/2022]
Abstract
Cardiovascular disease (CVD) is one of the leading causes of death worldwide. CVD includes coronary artery diseases such as angina, myocardial infarction, and stroke. "Lipid hypothesis" which is also known as the cholesterol hypothesis proposes the linkage of plasma cholesterol level with the risk of developing CVD. Conventional management involves the use of statins to reduce the serum cholesterol levels as means for CVD prevention or treatment. The regulation of serum cholesterol levels can potentially be regulated with biological interventions like monoclonal antibodies. Phage display is a powerful tool for the development of therapeutic antibodies with successes over the recent decade. Although mainly for oncology, the application of monoclonal antibodies as immunotherapeutic agents could potentially be expanded to CVD. This review focuses on the concept of phage display for antibody development and discusses the potential target antigens that could potentially be beneficial for serum cholesterol management.
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Affiliation(s)
- Soo Ghee Yeoh
- Institute for Research in Molecular Medicine, Universiti Sains Malaysia, 11800, Penang, Malaysia
| | - Jia Siang Sum
- Institute for Research in Molecular Medicine, Universiti Sains Malaysia, 11800, Penang, Malaysia
| | - Jing Yi Lai
- Institute for Research in Molecular Medicine, Universiti Sains Malaysia, 11800, Penang, Malaysia
| | - W Y Haniff W Isa
- School of Medical Sciences, Department of Medicine, Universiti Sains Malaysia, Kubang Kerian, 16150, Kelantan, Malaysia
| | - Theam Soon Lim
- Institute for Research in Molecular Medicine, Universiti Sains Malaysia, 11800, Penang, Malaysia.
- Analytical Biochemistry Research Centre, Universiti Sains Malaysia, 11800, Penang, Malaysia.
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15
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Navaeian M, Asadian S, Ahmadpour Yazdi H, Gheibi N. ANGPTL8 roles in proliferation, metabolic diseases, hypothyroidism, polycystic ovary syndrome, and signaling pathways. Mol Biol Rep 2021; 48:3719-3731. [PMID: 33864588 DOI: 10.1007/s11033-021-06270-8] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/21/2020] [Accepted: 03/05/2021] [Indexed: 12/18/2022]
Abstract
A new and atypical member of the ANGPTL family is angiopoietin-like protein 8 (ANGPTL8). This newly discovered hormone is a drug target that can be used to treat diabetes and dyslipidemia. The protein, as a hepatocyte-derived circulating factor, can control the triglyceride level of plasma. ANGPTL8 is significantly associated with inflammation and metabolic syndrome consequences such as obesity, diabetes, hypothyroidism, and PCOS. ANGPTL8 gene has four exons encoding a 22/5 kDa weight of 198 amino acid polypeptides. A highly preserved ANGPTL8 gene among mammals exhibits the essential hormone functions of ANGPTL8. Nevertheless, the physiological function of this hormone in the body is poorly understood. Studies published in PubMed (2008-2020), Google Scholar (2004-2020), and Scopus (2004-2020) databases of clinical trials were reviewed. This analysis is aimed at collecting information on ANGPTL8. The emphasis of this review was on gathering information about the role of ANGPTL8 in the metabolism of glucose and lipids and cell proliferation. It addition to the different roles of ANGPTL8 in diabetes and lipid metabolism, this review emphasized on the protein role in signaling pathways. The study also proposes the signaling pathways that may be considered as a new target for treatment.
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Affiliation(s)
- Maryam Navaeian
- Student Research Committee, Qazvin University of Medical Sciences, Qazvin, Iran
| | - Samieh Asadian
- Cellular and Molecular Research Center, Research Institute for Prevention of Non-Communicable Disease, Qazvin University of Medical Sciences, Qazvin, Iran
| | - Hossein Ahmadpour Yazdi
- Cellular and Molecular Research Center, Research Institute for Prevention of Non-Communicable Disease, Qazvin University of Medical Sciences, Qazvin, Iran.
| | - Nematollah Gheibi
- Cellular and Molecular Research Center, Research Institute for Prevention of Non-Communicable Disease, Qazvin University of Medical Sciences, Qazvin, Iran.
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16
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Xu F, Wang N, Li G, Tian D, Shi X. ANGPTL8/Betatrophin Improves Glucose Tolerance in Older Mice and Metabolomic Analysis Reveals Its Role in Insulin Resistance in HepG2 Cells. Diabetes Metab Syndr Obes 2021; 14:4209-4221. [PMID: 34703256 PMCID: PMC8523517 DOI: 10.2147/dmso.s330700] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/22/2021] [Accepted: 09/23/2021] [Indexed: 12/13/2022] Open
Abstract
BACKGROUND Insulin resistance is a determining factor in the pathophysiology of type 2 diabetes mellitus (T2DM). Angiopoietin-like protein 8 (ANGPTL8, also known as betatrophin), associated with glucose homeostasis and lipid metabolism, has attracted attention. But its mechanism in glucose metabolism remains unclear. This study aimed to explore the effect of ANGPTL8/betatrophin on glucose tolerance in Kunming (KM) mice of different ages and metabolic profiles in insulin-resistant HepG2 cells. Our study may provide a new perspective of ANGPTL8/betatrophin in insulin resistance from the metabolic changes. METHODS Oral glucose tolerance test was performed in KM mice of different ages. Insulin concentration was measured by using a quantitative enzyme-linked immunosorbent assay (ELISA). ANGPTL8/betatrophin knockouts in HepG2 cells were established with clustered regularly interspaced short palindromic repeats (CRISPR)/CRISPR-associated (Cas) protein 9 (CRISPR/Cas9) system. Cell counting kit-8 (CCK-8) assay was used to determine cell viability after gene knockout. The effect of ANGPTL8/betatrophin on the metabolomic changes was evaluated in high insulin-induced insulin-resistant HepG2 cells by an ultra-performance liquid chromatography-tandem mass spectrometry (UPLC-MS/MS) method. RESULTS ANGPTL8/betatrophin improved glucose tolerance in older mice not by altering the concentration of insulin. Cell growth was affected in ANGPTL8/betatrophin knockout HepG2. Based on UPLC-MS/MS, compared with wild type insulin-resistant HepG2 cells, we identified 83 differential metabolites in ANGPTL8/betatrophin knockout HepG2 cells after high insulin induction. Among the 14 differential up-regulated metabolites, D-mannose had the highest fold change. In insulin-resistant HepG2 cells, ANGPTL8/betatrophin knockout exerted an effect on the amino acid metabolism, carbohydrate metabolism, metabolism of cofactors and vitamins, lipid metabolism, nucleotide metabolism, and genetic information processing pathway. CONCLUSION This study identified the effect of ANGPTL8/betatrophin on glucose tolerance in mice of different ages and metabolic profiles in insulin-resistant HepG2 cells. These findings may contribute to a new understanding of its role in glucose metabolism in the context of insulin resistance.
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Affiliation(s)
- Fangfang Xu
- Clinical Medical Research Center, Department of Research and Discipline Development, Henan Provincial People’s Hospital, Zhengzhou University People’s Hospital, Henan University People’s Hospital, School of Clinical Medicine, Henan University, Zhengzhou, Henan, 450003, People’s Republic of China
- Correspondence: Fangfang Xu Clinical Medical Research Center, Department of Research and Discipline Development, Henan Provincial People’s Hospital, Zhengzhou University People’s Hospital, Henan University People’s Hospital, School of Clinical Medicine, Henan University, Zhengzhou, Henan, 450003, People’s Republic of ChinaTel +86-371 87160613 Email
| | - Nan Wang
- Biotechnology Research Institute, Chinese Academy of Agricultural Sciences, Beijing, 100081, People’s Republic of China
| | - Gangqiang Li
- Biotechnology Research Institute, Chinese Academy of Agricultural Sciences, Beijing, 100081, People’s Republic of China
| | - Dandan Tian
- Department of Hypertension, Henan Provincial People’s Hospital, Zhengzhou University People’s Hospital, Zhengzhou, Henan, 450003, People’s Republic of China
| | - Xiaoyang Shi
- Department of Endocrinology, Henan Provincial People’s Hospital, Zhengzhou University People’s Hospital, Zhengzhou, Henan, 450003, People’s Republic of China
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Lightbourne M, Wolska A, Abel BS, Rother KI, Walter M, Kushchayeva Y, Auh S, Shamburek RD, Remaley AT, Muniyappa R, Brown RJ. Apolipoprotein CIII and Angiopoietin-like Protein 8 are Elevated in Lipodystrophy and Decrease after Metreleptin. J Endocr Soc 2020; 5:bvaa191. [PMID: 33442570 DOI: 10.1210/jendso/bvaa191] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/24/2020] [Indexed: 02/08/2023] Open
Abstract
Context Lipodystrophy syndromes cause hypertriglyceridemia that improves with leptin treatment using metreleptin. Mechanisms causing hypertriglyceridemia and improvements after metreleptin are incompletely understood. Objective Determine relationship of circulating lipoprotein lipase (LPL) modulators with hypertriglyceridemia in healthy controls and in patients with lipodystrophy before and after metreleptin. Methods Cross-sectional comparison of patients with lipodystrophy (generalized lipodystrophy n = 3; partial lipodystrophy n = 11) vs age/sex-matched healthy controls (n = 28), and longitudinal analyses in patients before and after 2 weeks and 6 months of metreleptin. The study was carried out at the National Institutes of Health, Bethesda, Maryland. Outcomes were LPL stimulators apolipoprotein (apo) C-II and apoA-V and inhibitors apoC-III and angiopoietin-like proteins (ANGPTLs) 3, 4, and 8; ex vivo activation of LPL by plasma. Results Patients with lipodystrophy were hypertriglyceridemic and had higher levels of all LPL stimulators and inhibitors vs controls except for ANGPTL4, with >300-fold higher ANGPTL8, 4-fold higher apoC-III, 3.5-fold higher apoC-II, 1.9-fold higher apoA-V, 1.6-fold higher ANGPTL3 (P < .05 for all). At baseline, all LPL modulators except ANGPLT4 positively correlated with triglycerides. Metreleptin decreased apoC-II and apoC-III after 2 weeks and 6 months, and decreased ANGPTL8 after 6 months (P < 0.05 for all). Plasma from patients with lipodystrophy caused higher ex vivo LPL activation vs hypertriglyceridemic control plasma (P < .0001), which did not change after metreleptin. Conclusion Elevations in LPL inhibitors apoC-III and ANGPTL8 may contribute to hypertriglyceridemia in lipodystrophy, and may mediate reductions in circulating and hepatic triglycerides after metreleptin. These therefore are strong candidates for therapies to lower triglycerides in these patients.
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Affiliation(s)
- Marissa Lightbourne
- Eunice Kennedy Shriver National Institute of Child Health and Human Development, National Institutes of Health, Bethesda, MD, USA
| | - Anna Wolska
- Lipoprotein Metabolism Laboratory, Translational Vascular Medicine Branch, National Heart, Lung, and Blood Institute, National Institutes of Health, Bethesda, MD, USA
| | - Brent S Abel
- National Institute of Diabetes and Digestive and Kidney Diseases, National Institutes of Health, Bethesda, MD, USA
| | - Kristina I Rother
- National Institute of Diabetes and Digestive and Kidney Diseases, National Institutes of Health, Bethesda, MD, USA
| | - Mary Walter
- National Institute of Diabetes and Digestive and Kidney Diseases, National Institutes of Health, Bethesda, MD, USA
| | - Yevgeniya Kushchayeva
- National Institute of Diabetes and Digestive and Kidney Diseases, National Institutes of Health, Bethesda, MD, USA
| | - Sungyoung Auh
- National Institute of Diabetes and Digestive and Kidney Diseases, National Institutes of Health, Bethesda, MD, USA
| | - Robert D Shamburek
- Cardiovascular Branch, National Heart, Lung, and Blood Institute, National Institutes of Health, Bethesda, MD, USA
| | - Alan T Remaley
- Lipoprotein Metabolism Laboratory, Translational Vascular Medicine Branch, National Heart, Lung, and Blood Institute, National Institutes of Health, Bethesda, MD, USA
| | - Ranganath Muniyappa
- National Institute of Diabetes and Digestive and Kidney Diseases, National Institutes of Health, Bethesda, MD, USA
| | - Rebecca J Brown
- National Institute of Diabetes and Digestive and Kidney Diseases, National Institutes of Health, Bethesda, MD, USA
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Ruhanen H, Haridas PAN, Jauhiainen M, Olkkonen VM. Angiopoietin-like protein 3, an emerging cardiometabolic therapy target with systemic and cell-autonomous functions. Biochim Biophys Acta Mol Cell Biol Lipids 2020; 1865:158791. [PMID: 32777482 DOI: 10.1016/j.bbalip.2020.158791] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/21/2020] [Revised: 06/23/2020] [Accepted: 08/03/2020] [Indexed: 12/13/2022]
Abstract
Angiopoietin like protein 3 (ANGPTL3) is best known for its function as an inhibitor of lipoprotein and endothelial lipases. Due to the capacity of genetic or pharmacologic ANGPTL3 suppression to markedly reduce circulating lipoproteins, and the documented cardioprotection upon such suppression, ANGPTL3 has become an emerging therapy target for which both antibody and antisense oligonucleotide (ASO) therapeutics are being clinically tested. While the antibody is relatively selective for circulating ANGPTL3, the ASO also depletes the intra-hepatocellular protein, and there is emerging evidence for cell-autonomous functions of ANGPTL3 in the liver. These include regulation of hepatocyte glucose and fatty acid uptake, insulin sensitivity, LDL/VLDL remnant uptake, VLDL assembly/secretion, polyunsaturated fatty acid (PUFA) and PUFA-derived lipid mediator content, and gene expression. In this review we elaborate on (i) why ANGPTL3 is considered one of the most promising new cardiometabolic therapy targets, and (ii) the present evidences for its intra-hepatocellular or cell-autonomous functions.
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Affiliation(s)
- Hanna Ruhanen
- Minerva Foundation Institute for Medical Research, Helsinki, Finland; Molecular and Integrative Biosciences, University of Helsinki, Finland
| | | | - Matti Jauhiainen
- Minerva Foundation Institute for Medical Research, Helsinki, Finland
| | - Vesa M Olkkonen
- Minerva Foundation Institute for Medical Research, Helsinki, Finland; Department of Anatomy, Faculty of Medicine, University of Helsinki, Finland.
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Leutner M, Matzhold C, Bellach L, Deischinger C, Thurner S, Klimek P, Kautzky-Willer A. Betatrophin is downregulated in pregnant women with a history of RYGB operation and a high risk of postprandial hypoglycaemia. Sci Rep 2020; 10:13152. [PMID: 32753693 PMCID: PMC7403341 DOI: 10.1038/s41598-020-70075-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/28/2020] [Accepted: 06/22/2020] [Indexed: 11/21/2022] Open
Abstract
Betatrophin is a liver and adipose tissue-derived protein which has recently been linked to glucose metabolism. So far, no data exist about the role of betatrophin in pregnant women with a history of Roux-En-Y gastric bypass (RYGB) operation with a high risk of postprandial hypoglycaemia. In this prospective clinical study, an oral glucose tolerance test (OGTT) and an intravenous glucose tolerance test (IVGTT) were performed between the 24th and 28th week of pregnancy and 3–6 months post-partum in a cohort of obese and normal-weight pregnant women, as well as in women with a history of RYGB operation. In the cohort of pregnant women with RYGB and exaggerated risk of postprandial hypoglycaemic events, basal and dynamic betatrophin levels during the OGTT were lower than in the obese or normal-weight pregnant women (basal levels: 13.66 ± 5.88 vs. 19.03 ± 4.15 vs. 15.68 ± 6.48, p = 0.016; OGTT 60′: 13.33 ± 5.40 vs. 17.37 ± 3.16 vs. 15.84 ± 4.99, p = 0.030). During the OGTT, basal and dynamic betatrophin levels at 60′ were positively associated with glucose levels at 60 min (r = 0.55, p = 0.01 and r = 0.45, p = 0.039). This positive association was followed by significant hypoglycaemic events in the RYGB group. It was only in the RYGB group that betatrophin was negatively related to the disposition index (rho = -0.53, p = 0.014). After pregnancy there was a decrease in basal and stimulated betatrophin levels during the OGTT in all three patient groups. In comparison to normal-weight and obese pregnant women, women with a history of RYGB operation and a high risk of postprandial hypoglycaemic events have lower levels of betatrophin. This indicate a mechanistic role in order to decrease the risk of postprandial hypoglycaemia in this specific cohort.
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Affiliation(s)
- Michael Leutner
- Unit of Gender Medicine, Clinical Division of Endocrinology and Metabolism, Department of Internal Medicine III, Medical University of Vienna, Waehringer Guertel 18-20, 1090, Vienna, Austria
| | - Caspar Matzhold
- Section for Science of Complex Systems, CeMSIIS, Medical University of Vienna, Spitalgasse 23, 1090, Vienna, Austria.,Complexity Science Hub Vienna, Josefstädter Strasse 39, 1080, Vienna, Austria
| | - Luise Bellach
- Unit of Gender Medicine, Clinical Division of Endocrinology and Metabolism, Department of Internal Medicine III, Medical University of Vienna, Waehringer Guertel 18-20, 1090, Vienna, Austria
| | - Carola Deischinger
- Unit of Gender Medicine, Clinical Division of Endocrinology and Metabolism, Department of Internal Medicine III, Medical University of Vienna, Waehringer Guertel 18-20, 1090, Vienna, Austria
| | - Stefan Thurner
- Section for Science of Complex Systems, CeMSIIS, Medical University of Vienna, Spitalgasse 23, 1090, Vienna, Austria.,Complexity Science Hub Vienna, Josefstädter Strasse 39, 1080, Vienna, Austria.,Santa Fe Institute, 1399 Hyde Park Road, Santa Fe, NM, 85701, USA.,IIASA, Schlossplatz 1, 2361, Laxenburg, Austria
| | - Peter Klimek
- Section for Science of Complex Systems, CeMSIIS, Medical University of Vienna, Spitalgasse 23, 1090, Vienna, Austria.,Complexity Science Hub Vienna, Josefstädter Strasse 39, 1080, Vienna, Austria
| | - Alexandra Kautzky-Willer
- Unit of Gender Medicine, Clinical Division of Endocrinology and Metabolism, Department of Internal Medicine III, Medical University of Vienna, Waehringer Guertel 18-20, 1090, Vienna, Austria. .,Gender Institute, 3571, Gars am Kamp, Austria.
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Taherkhani F, Hosseini KM, Zebardast S, Chegini KG, Gheibi N. Anti proliferative and apoptotic effects on pancreatic cancer cell lines indicate new roles for ANGPTL8 (Betatrophin). Genet Mol Biol 2020; 43:e20190196. [PMID: 32745158 PMCID: PMC7416753 DOI: 10.1590/1678-4685-gmb-2019-0196] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/15/2019] [Accepted: 05/31/2020] [Indexed: 11/25/2022] Open
Abstract
Despite considerable advances, the treatment of pancreatic cancer (PC) still
requires much effort. Unusual regulation of the Wnt and apoptotic signaling
pathways is widespread in cancer incidence. For instance, the
WIF1 (Wnt inhibitory factor 1) gene is down-regulated in
many cancers. The purpose of this study was to determine the effects of
recombinant Betatrophin, a recently discovered hormone, on MiaPaca-II and
Panc-1 pancreatic cell lines. Various concentrations of
Betatrophin were added to MiaPaca-II and Panc-1 pancreatic cell
lines during periods of 24 , 48, and 72 h. The MTT assay was applied to
investigate cell proliferation after treatment. The rate of apoptotic cells was
assessed using double-staining flow cytometry, and the expression levels of the
WIF1 gene and Bcl2 protein was observed by real-time PCR
and western blotting, respectively. The findings of this study suggest that
Betatrophin has an anti-proliferative effect on both MiaPaca-II and Panc-1 cell
lines, in line with the up-regulation of WIF1 as a tumor
suppressor gene. Moreover, the induction of apoptosis by ANGPTL8 occurred by the
down-regulation of Bcl2. Thus, Betatrophin can be proposed as a potential
therapeutic drug for treating pancreatic cancer.
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Affiliation(s)
| | | | - Sanaz Zebardast
- Cellular and Molecular Research Center, Research Institute for Prevention of Non-Communicable Diseases, Qazvin University of Medical Sciences, Qazvin, Iran
| | - Koorosh Goodarzvand Chegini
- Cellular and Molecular Research Center, Research Institute for Prevention of Non-Communicable Diseases, Qazvin University of Medical Sciences, Qazvin, Iran
| | - Nematollah Gheibi
- Cellular and Molecular Research Center, Research Institute for Prevention of Non-Communicable Diseases, Qazvin University of Medical Sciences, Qazvin, Iran
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Angiopoietin-like protein 8 accelerates atherosclerosis in ApoE -/- mice. Atherosclerosis 2020; 307:63-71. [PMID: 32739681 DOI: 10.1016/j.atherosclerosis.2020.06.014] [Citation(s) in RCA: 19] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/11/2019] [Revised: 06/11/2020] [Accepted: 06/19/2020] [Indexed: 12/27/2022]
Abstract
BACKGROUND AND AIMS Angiopoietin-like protein 8 (ANGPTL8) is a hormone involved in regulating lipid metabolism. Patients with coronary artery disease have markedly higher plasma levels of ANGPTL8 than controls; however, the role of ANGPTL8 in atherosclerosis has not been explored. Therefore, we explored the effects of ANGPTL8 on atherosclerosis development in a mouse model. METHODS We induced experimental atherosclerosis in ApoE-/- mice ANGPTL8-knockdown. and ANGPTL8-overexpression ApoE-/- mice. We also explored the mechanism using ANGPTL8-overexpression macrophages. RESULTS ANGPTL8 expression was increased in human and mouse atherosclerotic lesions. ANGPTL8 overexpression promoted the development of atherosclerosis whereas ANGPTL8 knockdown protected against atherosclerosis. Immunofluorescence co-staining results showed that ANGPTL8 was expressed in macrophages in atherosclerotic plaques. Compared with wild type cells, ANGPTL8-overexpressing macrophages, including bone marrow-derived macrophages and Raw 264.7 macrophages, showed enhanced foam cell formation and increased accumulation of cholesterol that was induced by increased uptake and decreased efflux of cholesterol. The results of this study also showed that ANGPTL8 induced the expression of CD36 and scavenger receptor (SR)-A, and inhibited the expression of SR-BI. CONCLUSIONS Our findings demonstrate an unanticipated role of ANGPTL8 in the development of atherosclerosis and regulation of foam cell formation. ANGPTL8 may be a promising new target for atherosclerosis.
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ANGPTL8 enhances insulin sensitivity by directly activating insulin-mediated AKT phosphorylation. Gene 2020; 749:144707. [PMID: 32344005 DOI: 10.1016/j.gene.2020.144707] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/22/2020] [Revised: 04/14/2020] [Accepted: 04/21/2020] [Indexed: 12/14/2022]
Abstract
ANGPTL8 is a 22-KDa protein in the angiopoietin-like family. It is a liver-derived hormone that dynamically regulates glucose metabolism after refeeding. The mechanism of its regulation of glucose metabolism is unclear. We analyzed the effect of ANGPTL8 overexpression on glucose tolerance in the mouse liver by tail vein hydrodynamic transfection. The mechanism of ANGPTL8 improving insulin sensitivity was analyzed by the overexpression or knockdown of ANGPTL8 in mouse primary hepatocytes through in vitro synthetic mRNA and siRNA technology. The key site of ANGPTL8 protein regulating this signal pathway was screened by DNA point mutation and fragment truncation. The results showed that ANGPTL8 may directly regulate AKT protein phosphorylation in the insulin-mediated PI3K/AKT signaling pathway to improve insulin sensitivity. Ser94 and Thr98 are the key sites of ANGPTL8 protein in activating AKT protein phosphorylation. Present results indicate that ANGPTL8 may be a potential new agent to reduce postprandial blood glucose.
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Siddiqa A, Ahmad J, Ali A, Khan S. Deciphering the expression dynamics of ANGPTL8 associated regulatory network in insulin resistance using formal modelling approaches. IET Syst Biol 2020; 14:47-58. [PMID: 32196463 PMCID: PMC8687251 DOI: 10.1049/iet-syb.2019.0032] [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] [Indexed: 01/10/2023] Open
Abstract
ANGPTL8 is a recently identified novel hormone which regulates both glucose and lipid metabolism. The increase in ANGPTL8 during compensatory insulin resistance has been recently reported to improve glucose tolerance and a part of cytoprotective metabolic circuit. However, the exact signalling entities and dynamics involved in this process have remained elusive. Therefore, the current study was conducted with a specific aim to model the regulation of ANGPTL8 with emphasis on its role in improving glucose tolerance during insulin resistance. The main contribution of this study is the construction of a discrete model (based on kinetic logic of René Thomas) and its equivalent Stochastic Petri Net model of ANGPTL8 associated Biological Regulatory Network (BRN) which can predict its dynamic behaviours. The predicted results of these models are in‐line with the previous experimental observations and provide comprehensive insights into the signalling dynamics of ANGPTL8 associated BRN. The authors’ results support the hypothesis that ANGPTL8 plays an important role in supplementing the insulin signalling pathway during insulin resistance and its loss can aggravate the pathogenic process by quickly leading towards Diabetes Mellitus. The results of this study have potential therapeutic implications for treatment of Diabetes Mellitus and are suggestive of its potential as a glucose‐lowering agent.
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Affiliation(s)
- Amnah Siddiqa
- Research Center for Modelling and Simulation (RCMS), National university of Sciences and Technology (NUST), Sector H-12, Islamabad 46000, Pakistan
| | - Jamil Ahmad
- Department of Computer Science and Information Technology, University of Malakand, Chakdara, Dir Lower, Khyber Pakhtunkhwa 18800, Pakistan.
| | - Amjad Ali
- Atta-ur-Rahman School of Applied Biosciences (ASAB), National University of Sciences and Technology (NUST), Sector H-12, Islamabad 46000, Pakistan
| | - Sharifullah Khan
- School of Electrical Engineering and Computer Science (SEECS), National University of Sciences and Technology (NUST), Pakistan
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Evidences for Expression and Location of ANGPTL8 in Human Adipose Tissue. J Clin Med 2020; 9:jcm9020512. [PMID: 32069954 PMCID: PMC7074245 DOI: 10.3390/jcm9020512] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/26/2020] [Accepted: 02/10/2020] [Indexed: 12/25/2022] Open
Abstract
The metabolism of triglycerides (TGs) is regulated, among others, by the lipoprotein lipase (LPL) that hydrolyses the TGs on endothelial cells. In turn, LPL is inhibited by the ANGPTLs family of proteins, such as ANGPTL3, 4, and, 8; the latter is the least known. In this work, we have tried to establish the expression and localisation of the Angiopoietin-like 8 (ANGPTL8) protein in the visceral adipose tissue (VAT) of morbid-obese and non-obese patients. 109 subjects (66 women and 43 men) undergoing laparoscopic surgery participated in this study. A blood sample and a portion of the VAT were obtained, and the patients were classified according to their Body Mass Index (BMI) as non-obese (19.5–30 kg/m2) and morbid-obese (40–50 kg/m2). No significant changes in ANGPTL8 plasma levels were determined by EIA in obese patients. The immunocytochemistry and Western blotting showed the presence of increased ANGPTL8 in morbid-obese patients (p < 0.05). In-situ hybridisation and a real time polymerase chain reaction (RT-PCR) confirmed that the mRNA that encodes ANGPTL8 was present in adipocytes, without differences in their nutritional state (p = 0.89), and even in the endothelial cells. Our data suggests that ANGPT8 plasmatic levels do not change significantly in patients with morbid obesity, although there is a modest difference related to gender. Besides, we demonstrate that in visceral adipose tissue, ANGPTL8 is well defined in the cytoplasm of adipocytes coexisting with perilipin-1 and its mRNA, also is present in endothelial cells. These findings suggest the possibility that among other functions, ANGPTL8 could perform either a paracrine and/or an endocrine role in the adipose tissue.
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Morelli MB, Chavez C, Santulli G. Angiopoietin-like proteins as therapeutic targets for cardiovascular disease: focus on lipid disorders. Expert Opin Ther Targets 2020; 24:79-88. [PMID: 31856617 DOI: 10.1080/14728222.2020.1707806] [Citation(s) in RCA: 36] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
Abstract
Introduction: Angiopoietin-like (ANGPTL) proteins belong to a family of eight secreted factors that are structurally related to proteins that modulate angiogenesi, commonly known as angiopoietins. Specifically, ANGPTL3, ANGPTL4, and ANGPTL8 (the 'ANGPT L3-4-8 triad'), have surfaced as principal regulators of plasma lipid metabolism by functioning as potent inhibitors of lipoprotein lipase. The targeting of these proteins may open up future therapeutic avenues for metabolic and cardiovascular disease.Areas covered: This article systematically summarizes the compelling literature describing the mechanistic roles of ANGPTL3, 4, and 8 in lipid metabolism, emphasizing their importance in determining the risk of cardiovascular disease. We shed light on population-based studies linking loss-of-function variations in ANGPTL3, 4, and 8 with decreased risk of metabolic conditions and cardiovascular disorders. We also discuss how the strategies aiming at targeting the ANGPT L3-4-8 triad could offer therapeutic benefit in the clinical scenario.Expert opinion: Monoclonal antibodies and antisense oligonucleotides that target ANGPTL3, 4, and 8 are potentially an efficient therapeutic strategy for hypertriglyceridemia and cardiovascular risk reduction, especially in patients with limited treatment options. These innovative therapeutical approaches are at an embryonic stage in development and hence further investigations are necessary for eventual use in humans.
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Affiliation(s)
- Marco Bruno Morelli
- Department of Medicine; Wilf Family Cardiovascular Research Institute, Albert Einstein College of Medicine, New York, NY, USA.,Department of Molecular Pharmacology, Einstein-Mount Sinai Diabetes Research Center (ES-DRC), The "Norman Fleischer" Institute for Diabetes and Metabolism (FIDAM), Albert Einstein College of Medicine, NY, New York, USA
| | - Christopher Chavez
- Department of Medicine; Wilf Family Cardiovascular Research Institute, Albert Einstein College of Medicine, New York, NY, USA
| | - Gaetano Santulli
- Department of Medicine; Wilf Family Cardiovascular Research Institute, Albert Einstein College of Medicine, New York, NY, USA.,Department of Molecular Pharmacology, Einstein-Mount Sinai Diabetes Research Center (ES-DRC), The "Norman Fleischer" Institute for Diabetes and Metabolism (FIDAM), Albert Einstein College of Medicine, NY, New York, USA.,Department of Advanced Biomedical Sciences and International Translational Research and Medical Education Consortium (ITME), "Federico II" University, Naples, Italy
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Zhou J, Zhe R, Guo X, Chen Y, Zou Y, Zhou L, Wang Z. The Role of PPARδ Agosnist GW501516 in Rats with Gestational Diabetes Mellitus. Diabetes Metab Syndr Obes 2020; 13:2307-2316. [PMID: 32669864 PMCID: PMC7335770 DOI: 10.2147/dmso.s251491] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/26/2020] [Accepted: 05/19/2020] [Indexed: 12/24/2022] Open
Abstract
BACKGROUND Gestational diabetes mellitus (GDM) is a disorder of glucose metabolism that occurs or is found for the first time during pregnancy. GDM is very harmful and urgently needs drug treatment to improve pregnancy outcome. PPARδ is involved in a variety of biological processes related to glycolipid metabolism in the body, suggesting that it may be closely related to insulin resistance and impaired glucose tolerance. The role of PPARδ agonist GW501516 in gestational diabetes has not been studied. METHODS Firstly, the rat model of GDM was established. Then, fasting blood-glucose (FGB), fasting insulin (FINS), HOMA-islet resistance index (HOMA-IR) and insulin sensitivity index (ISI) of GDM rats treated with GW501516 were measured on day 3, day 10 and day 17. Glucose tolerance test was performed on the 20th day of gestation to measure glucose tolerance in rats. The expression of PPARδ and Angptl8 in islet tissues of rats was detected by Western blot and immunohistochemistry (IHC). Histopathological changes of islet were detected by HE stain; apoptosis rate of islet cells was detected by Tunel; and expression of apoptosis-related proteins in the cells was detected by Western blot. The biochemical kits were used to detect the expression of lipid metabolism-related factors in blood of GDM rats after the PPARδ agonist GW501516 treatment. Finally, the expression of SREBP-1c and GLUT2 in islet tissues was detected by RT-qPCR and IHC. RESULTS The PPARδ agonist GW501516 decreased the expression of FGB, FINS and HOMA-IR in GDM rats, and we found that GW501516 decreased ISI in GDM rats. GW501516 increased glucose tolerance in GDM rats too. In GDM rats, the expression of PPARδ in islet decreased and the expression of Angptl8 increased, which was reversed by GW501516. In addition, we also found that GW501516 can improve the damaged islet tissue of GDM rats, reduce the apoptosis rate of islet cells and inhibit the expression of lipid metabolism-related factors in the blood. Finally, we found that GW501516 inhibited the expression of SREBP-1c and promoted the expression of GLUT2 in the islet tissue. CONCLUSION The PPARδ agonist GW501516 could improve the blood glucose level, damaged islet tissue and increase the insulin content in the rats with GDM, possibly by regulating the SREBP-1c/GLUT2 pathway. Our study provided a new basis for clinical treatment of GDM in pregnant women with PPARδ agonist GW501516.
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Affiliation(s)
- Jun Zhou
- Department of Obstetrics, Shenzhen People’s Hospital, Shenzhen518000, People’s Republic of China
| | - Ruilian Zhe
- Department of Obstetrics, Shenzhen People’s Hospital, Shenzhen518000, People’s Republic of China
| | - Xiaohui Guo
- Department of Obstetrics, Shenzhen People’s Hospital, Shenzhen518000, People’s Republic of China
| | - Yuying Chen
- Department of Obstetrics, Shenzhen People’s Hospital, Shenzhen518000, People’s Republic of China
| | - Yan Zou
- Emergency Department of Shenzhen Maternal and Child Health Hospital, Shenzhen518000, People’s Republic of China
| | - Li Zhou
- Department of Obstetrics, Shenzhen People’s Hospital, Shenzhen518000, People’s Republic of China
| | - Zhijian Wang
- Department of Obstetrics and Gynecology, Nanfang Hospital, Southern Medical University, Guangzhou, Guangdong510510, People’s Republic of China
- Correspondence: Zhijian Wang Department of Obstetrics and Gynecology, Nanfang Hospital, Southern Medical University, Number 1838, North Guangzhou Avenue, Guangzhou, Guangdong510515, People’s Republic of China Email
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Guo C, Zhao L, Ding Y, Zhao Z, Wang C, Li L, Cai Z, Li Y, Xia H, Zhu Z, Yu F, Dai M, Deng X, Yuan G. ANGPTL8 Gene Polymorphism rs2278426 Is Related to Carotid Intima-Media Thickness in T2DM. Diabetes Metab Syndr Obes 2020; 13:4519-4528. [PMID: 33244249 PMCID: PMC7685358 DOI: 10.2147/dmso.s274759] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/30/2020] [Accepted: 09/17/2020] [Indexed: 01/03/2023] Open
Abstract
AIM ANGPTL8 is a cytokine expressed and secreted by liver and adipose tissue, and is involved in glucose, lipid, and energy metabolism. Although studies have shown that ANGPTL8 is elevated in type 2 diabetes mellitus (T2DM) and cardiovascular disease, few have examined the association between ANGPTL8 single-nucleotide polymorphisms and the risk of macrovascular complications in T2DM patients. This study aimed to explore the relationship between rs2278426 and carotid intima-media thickening (cIMT) in T2DM. METHODS A total of 217 T2DM patients and 201 healthy control subjects with normal glucose tolerance were recruited in the study. T2DM patients were divided into two groups: T2DM patients without cIM thickening (cIMT <1 mm, 109 cases) and T2DM patients with cIM thickening (cIMT ≥1 mm, 108 cases). rs2278426 genotypes in all 418 subjects were determined and the risk of T2DM and T2DM with cIM thickening analyzed. RESULTS CT+TT-genotype frequency in T2DM was higher than in controls with normal glucose tolerance, and the proportion of the CT+TT genotype in the group with cIMT was higher than in the group (P<0.05). In addition, T alleles were associated with waist:hip ratio, triglycerides, high density-lipoprotein cholesterol, plasma glucose at 2 hours' oral glucose tolerance, and homeostatic model assessment of insulin resistance (P<0.05). CONCLUSION Generally, carriers of the T allele at rs2278426 are more likely to develop T2DM, and the risk of cIM thickening is significantly increased for T-allele carriers with T2DM, which indicates an increased risk of macroangiopathy.
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Affiliation(s)
- Chang Guo
- Department of Endocrinology, Affiliated Hospital of Jiangsu University, Zhenjiang, Jiangsu, 212001, People’s Republic of China
| | - Li Zhao
- Department of Endocrinology, Affiliated Hospital of Jiangsu University, Zhenjiang, Jiangsu, 212001, People’s Republic of China
| | - Yi Ding
- Department of Endocrinology, Affiliated Hospital of Jiangsu University, Zhenjiang, Jiangsu, 212001, People’s Republic of China
| | - Zhicong Zhao
- Department of Endocrinology, Affiliated Hospital of Jiangsu University, Zhenjiang, Jiangsu, 212001, People’s Republic of China
| | - Chenxi Wang
- Department of Endocrinology, Affiliated Hospital of Jiangsu University, Zhenjiang, Jiangsu, 212001, People’s Republic of China
| | - Lian Li
- Department of Endocrinology, Affiliated Hospital of Jiangsu University, Zhenjiang, Jiangsu, 212001, People’s Republic of China
| | - Zhensheng Cai
- Department of Endocrinology, Affiliated Hospital of Jiangsu University, Zhenjiang, Jiangsu, 212001, People’s Republic of China
| | - Yanyan Li
- Department of Endocrinology, Affiliated Hospital of Jiangsu University, Zhenjiang, Jiangsu, 212001, People’s Republic of China
| | - Hong Xia
- Department of Endocrinology, Affiliated Hospital of Jiangsu University, Zhenjiang, Jiangsu, 212001, People’s Republic of China
| | - ZhuanZhuan Zhu
- Department of Endocrinology, Affiliated Hospital of Jiangsu University, Zhenjiang, Jiangsu, 212001, People’s Republic of China
| | - Fan Yu
- Department of Endocrinology, Affiliated Hospital of Jiangsu University, Zhenjiang, Jiangsu, 212001, People’s Republic of China
| | - Meiqing Dai
- Department of Endocrinology, Affiliated Hospital of Jiangsu University, Zhenjiang, Jiangsu, 212001, People’s Republic of China
| | - Xia Deng
- Department of Endocrinology, Affiliated Hospital of Jiangsu University, Zhenjiang, Jiangsu, 212001, People’s Republic of China
- Xia Deng Department of Endocrinology, Affiliated Hospital of Jiangsu University, Zhenjiang, Jiangsu, 212001, People’s Republic of China Email
| | - Guoyue Yuan
- Department of Endocrinology, Affiliated Hospital of Jiangsu University, Zhenjiang, Jiangsu, 212001, People’s Republic of China
- Correspondence: Guoyue Yuan Department of Endocrinology, Affiliated Hospital of Jiangsu University, Zhenjiang, Jiangsu212001, People’s Republic of ChinaTel +86-135-0528-9352 Email
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Hou G, Tang Y, Ren L, Guan Y, Hou X, Song G. The ANGPTL8 rs2278426 (C/T) Polymorphism Is Associated with Prediabetes and Type 2 Diabetes in a Han Chinese Population in Hebei Province. Int J Endocrinol 2020; 2020:1621239. [PMID: 33343659 PMCID: PMC7728483 DOI: 10.1155/2020/1621239] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/01/2020] [Revised: 10/14/2020] [Accepted: 11/23/2020] [Indexed: 12/23/2022] Open
Abstract
BACKGROUND Our aim was to investigate the association between the genetics of the angiopoietin protein-like 8 (ANGPTL8) rs2278426 (C/T) polymorphism with prediabetes (pre-DM) and type 2 diabetes (T2DM) in a Han Chinese population in Hebei Province, China. METHODS We enrolled 1,460 participants into this case-control study: healthy controls, n = 524; pre-DM, n = 460; and T2DM: n = 460. Ligase assays on blood samples from all participants were used to identify polymorphisms. Differences in genotype and allele distributions were compared by the chi-square test and one-way analysis of variance, and a post hoc pairwise analysis was performed using the Bonferroni test. The logistic regression technique was adjusted for age, sex, and body mass index. RESULTS The frequency of the TT (10.9%) genotype was significantly higher in pre-DM patients than in controls (odds ratio [OR] = 1.696, 95% confidence interval [CI] = 1.026-2.802, P=0.039). In the T2DM group, the CT (48%) and TT (15%) genotypes were significantly higher compared with those in the control group (CT : OR = 1.384, 95% CI = 1.013-1.890, P=0.041; TT : OR = 2.530, 95% CI = 1.476-4.334, P=0.001). The frequency of the T allele was significantly higher in the pre-DM (32.8%) and T2DM (39%) groups compared with the control group (26.9%) and was significantly associated with an increased risk of pre-DM (OR = 1.253, 95% CI = 1.017-1.544, P=0.034) and T2DM (OR = 1.518, 95% CI = 1.214-1.897, P=0.001). Furthermore, insulin levels in the pre-DM and T2DM groups were significantly decreased in those with the TT genotype compared with the CC and CT genotypes. CONCLUSION ANGPTL8 rs2278426 may be involved in the mechanism of insulin secretion and could lead to an increased risk of pre-DM and T2DM.
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Affiliation(s)
- Guangsen Hou
- Department of Internal Medicine, Hebei Medical University, Shijiazhuang, Hebei 050017, China
| | - Yong Tang
- Endocrinology Department, Hebei General Hospital, Shijiazhuang, Hebei 050051, China
| | - Luping Ren
- Endocrinology Department, Hebei General Hospital, Shijiazhuang, Hebei 050051, China
| | - Yunpeng Guan
- Department of Internal Medicine, Hebei Medical University, Shijiazhuang, Hebei 050017, China
| | - Xiaoyu Hou
- Department of Internal Medicine, Hebei Medical University, Shijiazhuang, Hebei 050017, China
| | - Guangyao Song
- Department of Internal Medicine, Hebei Medical University, Shijiazhuang, Hebei 050017, China
- Endocrinology Department, Hebei General Hospital, Shijiazhuang, Hebei 050051, China
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Lundsgaard AM, Fritzen AM, Nicolaisen TS, Carl CS, Sjøberg KA, Raun SH, Klein AB, Sanchez-Quant E, Langer J, Ørskov C, Clemmensen C, Tschöp MH, Richter EA, Kiens B, Kleinert M. Glucometabolic consequences of acute and prolonged inhibition of fatty acid oxidation. J Lipid Res 2020; 61:10-19. [PMID: 31719103 PMCID: PMC6939602 DOI: 10.1194/jlr.ra119000177] [Citation(s) in RCA: 19] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/03/2019] [Revised: 09/20/2019] [Indexed: 12/22/2022] Open
Abstract
Excessive circulating FAs have been proposed to promote insulin resistance (IR) of glucose metabolism by increasing the oxidation of FAs over glucose. Therefore, inhibition of FA oxidation (FAOX) has been suggested to ameliorate IR. However, prolonged inhibition of FAOX would presumably cause lipid accumulation and thereby promote lipotoxicity. To understand the glycemic consequences of acute and prolonged FAOX inhibition, we treated mice with the carnitine palmitoyltransferase 1 (CPT-1) inhibitor, etomoxir (eto), in combination with short-term 45% high fat diet feeding to increase FA availability. Eto acutely increased glucose oxidation and peripheral glucose disposal, and lowered circulating glucose, but this was associated with increased circulating FAs and triacylglycerol accumulation in the liver and heart within hours. Several days of FAOX inhibition by daily eto administration induced hepatic steatosis and glucose intolerance, specific to CPT-1 inhibition by eto. Lower whole-body insulin sensitivity was accompanied by reduction in brown adipose tissue (BAT) uncoupling protein 1 (UCP1) protein content, diminished BAT glucose clearance, and increased hepatic glucose production. Collectively, these data suggest that pharmacological inhibition of FAOX is not a viable strategy to treat IR, and that sufficient rates of FAOX are required for maintaining liver and BAT metabolic function.
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Affiliation(s)
- Anne-Marie Lundsgaard
- Section of Molecular Physiology, Department of Nutrition, Exercise, and Sports, Faculty of Science, University of Copenhagen, Copenhagen, Denmark
| | - Andreas M Fritzen
- Section of Molecular Physiology, Department of Nutrition, Exercise, and Sports, Faculty of Science, University of Copenhagen, Copenhagen, Denmark
| | - Trine S Nicolaisen
- Section of Molecular Physiology, Department of Nutrition, Exercise, and Sports, Faculty of Science, University of Copenhagen, Copenhagen, Denmark
| | - Christian S Carl
- Section of Molecular Physiology, Department of Nutrition, Exercise, and Sports, Faculty of Science, University of Copenhagen, Copenhagen, Denmark
| | - Kim A Sjøberg
- Section of Molecular Physiology, Department of Nutrition, Exercise, and Sports, Faculty of Science, University of Copenhagen, Copenhagen, Denmark
| | - Steffen H Raun
- Section of Molecular Physiology, Department of Nutrition, Exercise, and Sports, Faculty of Science, University of Copenhagen, Copenhagen, Denmark
| | - Anders B Klein
- Novo Nordisk Foundation Center for Basic Metabolic Research, Faculty of Health and Medical Sciences, University of Copenhagen, Copenhagen, Denmark
| | - Eva Sanchez-Quant
- Institute for Diabetes and Obesity, Helmholtz Diabetes Center at Helmholtz Zentrum München, German Research Center for Environmental Health, Neuherberg, Germany
| | - Jakob Langer
- Institute for Diabetes and Obesity, Helmholtz Diabetes Center at Helmholtz Zentrum München, German Research Center for Environmental Health, Neuherberg, Germany
| | - Cathrine Ørskov
- Department of Biomedical Sciences, Faculty of Health and Medical Sciences, University of Copenhagen, Copenhagen, Denmark
| | - Christoffer Clemmensen
- Novo Nordisk Foundation Center for Basic Metabolic Research, Faculty of Health and Medical Sciences, University of Copenhagen, Copenhagen, Denmark
| | - Matthias H Tschöp
- Institute for Diabetes and Obesity, Helmholtz Diabetes Center at Helmholtz Zentrum München, German Research Center for Environmental Health, Neuherberg, Germany; German Center for Diabetes Research (DZD), Helmholtz Zentrum München, Neuherberg, Germany; Division of Metabolic Diseases, Technische Universität München, München, Germany
| | - Erik A Richter
- Section of Molecular Physiology, Department of Nutrition, Exercise, and Sports, Faculty of Science, University of Copenhagen, Copenhagen, Denmark
| | - Bente Kiens
- Section of Molecular Physiology, Department of Nutrition, Exercise, and Sports, Faculty of Science, University of Copenhagen, Copenhagen, Denmark.
| | - Maximilian Kleinert
- Section of Molecular Physiology, Department of Nutrition, Exercise, and Sports, Faculty of Science, University of Copenhagen, Copenhagen, Denmark; Institute for Diabetes and Obesity, Helmholtz Diabetes Center at Helmholtz Zentrum München, German Research Center for Environmental Health, Neuherberg, Germany.
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Esfahani M, Goodarzi MT. A Short Review on ANGPTL-8 as an Important Regulator in Diabetes. AVICENNA JOURNAL OF MEDICAL BIOCHEMISTRY 2019. [DOI: 10.34172/ajmb.2019.11] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022] Open
Abstract
ANGPTL8, a new hormone, is regarded as a novel target for type-2 diabetes and associated metabolic disorder. Nutritional state and hormonal factors are involved in the regulation of ANGPTL-8 expression. This protein is associated with some myokines or adipokines. Several studies confirmed the function of ANGPTL-8 in glucose metabolism and diabetes complications; however, there are opposite results. The accurate function of ANGPTL-8 in T2D remains unclear. Further strictly controlled studies including measuring methods, nutritional state, diagnostic criteria of overweight/obesity, age, and ethnicity may help to resolve discrepancies. In addition, more studies are demanded to clarify the potential role of ANGPTL-8 in humans, a cause or an effect of this protein in association with insulin resistance, the regulatory mechanism of ANGPTL-8 expression, and the association of ANGPTL8 with other adipokines or myokines. In this mini review, we described various roles of ANGPTL-8 in diabetes.
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Affiliation(s)
- Maryam Esfahani
- Ph.D. in Clinical Biochemistry, Nutrition Health Research Center, Hamadan University of Medical Sciences, Hamadan, Iran
| | - Mohammad Taghi Goodarzi
- Professor of Clinical Biochemistry, Department of Biochemistry, Shahrood Branch, Islamic Azad University, Shahrood, Iran
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31
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Guo C, Zhao Z, Deng X, Chen Z, Tu Z, Yuan G. Regulation of angiopoietin-like protein 8 expression under different nutritional and metabolic status. Endocr J 2019; 66:1039-1046. [PMID: 31631098 DOI: 10.1507/endocrj.ej19-0263] [Citation(s) in RCA: 11] [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
Type 2 diabetes mellitus (T2DM) is a chronic metabolic disease with increasing prevalence worldwide. Angiopoietin-like protein 8 (ANGPTL8), a member of the angiopoietin-like protein family, is involved in glucose metabolism, lipid metabolism, and energy homeostasis and believed to be associated with T2DM. Expression levels of ANGPTL8 are often significantly altered in metabolic diseases, such as non-alcoholic fatty liver disease (NAFLD) and diabetes mellitus. Studies have shown that ANGPTL8, together with other members of this protein family, such as angiopoietin-like protein 3 (ANGPTL3) and angiopoietin-like protein 4 (ANGPTL4), regulates the activity of lipoprotein lipase (LPL), thereby participating in the regulation of triglyceride related lipoproteins (TRLs). In addition, members of the angiopoietin-like protein family are varyingly expressed among different tissues and respond differently under diverse nutritional and metabolic status. These findings may provide new options for the diagnosis and treatment of diabetes, metabolic syndromes and other diseases. In this review, the interaction between ANGPTL8 and ANGPTL3 or ANGPTL4, and the differential expression of ANGPTL8 responding to different nutritional and metabolic status during the regulation of LPL activity were reviewed.
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Affiliation(s)
- Chang Guo
- Department of Endocrinology, Affiliated Hospital of Jiangsu University, Zhenjiang, Jiangsu 212001, China
| | - Zhicong Zhao
- Department of Endocrinology, Affiliated Hospital of Jiangsu University, Zhenjiang, Jiangsu 212001, China
| | - Xia Deng
- Department of Endocrinology, Affiliated Hospital of Jiangsu University, Zhenjiang, Jiangsu 212001, China
| | - Zian Chen
- Institute of Life Sciences, Jiangsu University, Zhenjiang, Jiangsu 212013, China
| | - Zhigang Tu
- Institute of Life Sciences, Jiangsu University, Zhenjiang, Jiangsu 212013, China
| | - Guoyue Yuan
- Department of Endocrinology, Affiliated Hospital of Jiangsu University, Zhenjiang, Jiangsu 212001, China
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32
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Hu S, Wang J, Yan X, Yang H, Li S, Jiang W, Liu Y. Egg oil from Portunus trituberculatus alleviates insulin resistance through activation of insulin signaling in mice. Appl Physiol Nutr Metab 2019; 44:1081-1088. [PMID: 30802144 DOI: 10.1139/apnm-2018-0718] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2023]
Abstract
Marine bioactive lipids have been utilized to overcome insulin resistance. However, oil from swimming crab has never been studied. Here, we analyzed the constituents of egg oil from Portunus trituberculatus (Pt-egg oil) and investigated its protective effects against insulin resistance in mice on a high-fat diet. The results showed that Pt-egg oil contained 52.05% phospholipids, 8.61% free fatty acids (especially eicosapentaenoic acid and docosahexaenoic acid), 32.38% triglyceride, 4.79% total cholesterol, and ditissimus astaxanthin. Animal experiments showed that Pt-egg oil significantly mitigated insulin resistance and was associated with reductions in blood glucose, insulin, glucose tolerance, insulin tolerance, serum lipids, and hepatic glycogen. Pt-egg oil activated the phosphatidylinositol 3-hydroxy kinase (PI3K)/protein kinase B (Akt)/glucose transporter 4 pathway in skeletal muscle both at the transcriptional level and at the translational level. Pt-egg oil also promoted hepatic glycogen synthesis through activation of the PI3K/Akt/glycogen synthase kinase-3 beta pathway. These indicate that Pt-egg oil can be used as an alternative to marine bioactive lipids to improve insulin resistance.
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Affiliation(s)
- Shiwei Hu
- Innovation Application Institute, Zhejiang Ocean University, Zhoushan, Zhoushan, 316022, China
| | - Jingfeng Wang
- College of Food Science and Engineering, Ocean University of China, Qingdao, Shandong Province 266003, China
| | - Xiaojun Yan
- Innovation Application Institute, Zhejiang Ocean University, Zhoushan, Zhoushan, 316022, China
| | - Huicheng Yang
- Zhejiang Marine Development Research Institute, Zhoushan 316021, China
| | - Shijie Li
- Innovation Application Institute, Zhejiang Ocean University, Zhoushan, Zhoushan, 316022, China
| | - Wei Jiang
- Innovation Application Institute, Zhejiang Ocean University, Zhoushan, Zhoushan, 316022, China
| | - Yu Liu
- Innovation Application Institute, Zhejiang Ocean University, Zhoushan, Zhoushan, 316022, China
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33
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Janssen LGM, Jauhiainen M, Olkkonen VM, Haridas PAN, Nahon KJ, Rensen PCN, Boon MR. Short-Term Cooling Increases Plasma ANGPTL3 and ANGPTL8 in Young Healthy Lean Men but Not in Middle-Aged Men with Overweight and Prediabetes. J Clin Med 2019; 8:jcm8081214. [PMID: 31416197 PMCID: PMC6723119 DOI: 10.3390/jcm8081214] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/03/2019] [Revised: 08/08/2019] [Accepted: 08/12/2019] [Indexed: 01/16/2023] Open
Abstract
Angiopoietin-like proteins (ANGPTLs) regulate triglyceride (TG)-rich lipoprotein distribution via inhibiting TG hydrolysis by lipoprotein lipase in metabolic tissues. Brown adipose tissue combusts TG-derived fatty acids to enhance thermogenesis during cold exposure. It has been shown that cold exposure regulates ANGPTL4, but its effects on ANGPTL3 and ANGPTL8 in humans have not been elucidated. We therefore investigated the effect of short-term cooling on plasma ANGPTL3 and ANGPTL8, besides ANGPTL4. Twenty-four young, healthy, lean men and 20 middle-aged men with overweight and prediabetes were subjected to 2 h of mild cooling just above their individual shivering threshold. Before and after short-term cooling, plasma ANGPTL3, ANGPTL4, and ANGPTL8 were determined by ELISA. In young, healthy, lean men, short-term cooling increased plasma ANGPTL3 (+16%, p < 0.05), ANGPTL4 (+15%, p < 0.05), and ANGPTL8 levels (+28%, p < 0.001). In middle-aged men with overweight and prediabetes, short-term cooling only significantly increased plasma ANGPTL4 levels (+15%, p < 0.05), but not ANGPTL3 (230 ± 9 vs. 251 ± 13 ng/mL, p = 0.051) or ANGPTL8 (2.2 ± 0.5 vs. 2.3 ± 0.5 μg/mL, p = 0.46). We show that short-term cooling increases plasma ANGPTL4 levels in men, regardless of age and metabolic status, but only overtly increases ANGPTL3 and ANGPTL8 levels in young, healthy, lean men.
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Affiliation(s)
- Laura G M Janssen
- Department of Medicine, Division of Endocrinology, Leiden University Medical Center, P.O. Box 9600, 2300 RC Leiden, The Netherlands
- Einthoven Laboratory for Experimental Vascular Medicine, Leiden University Medical Center, P.O. Box 9600, 2300 RC Leiden, The Netherlands
| | - Matti Jauhiainen
- Minerva Foundation Institute for Medical Research, Biomedicum 2U, 00290 Helsinki, Finland
| | - Vesa M Olkkonen
- Minerva Foundation Institute for Medical Research, Biomedicum 2U, 00290 Helsinki, Finland
| | - P A Nidhina Haridas
- Minerva Foundation Institute for Medical Research, Biomedicum 2U, 00290 Helsinki, Finland
| | - Kimberly J Nahon
- Department of Medicine, Division of Endocrinology, Leiden University Medical Center, P.O. Box 9600, 2300 RC Leiden, The Netherlands
- Einthoven Laboratory for Experimental Vascular Medicine, Leiden University Medical Center, P.O. Box 9600, 2300 RC Leiden, The Netherlands
| | - Patrick C N Rensen
- Department of Medicine, Division of Endocrinology, Leiden University Medical Center, P.O. Box 9600, 2300 RC Leiden, The Netherlands
- Einthoven Laboratory for Experimental Vascular Medicine, Leiden University Medical Center, P.O. Box 9600, 2300 RC Leiden, The Netherlands
| | - Mariëtte R Boon
- Department of Medicine, Division of Endocrinology, Leiden University Medical Center, P.O. Box 9600, 2300 RC Leiden, The Netherlands.
- Einthoven Laboratory for Experimental Vascular Medicine, Leiden University Medical Center, P.O. Box 9600, 2300 RC Leiden, The Netherlands.
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34
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Angptl8 mediates food-driven resetting of hepatic circadian clock in mice. Nat Commun 2019; 10:3518. [PMID: 31388006 PMCID: PMC6684615 DOI: 10.1038/s41467-019-11513-1] [Citation(s) in RCA: 35] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/28/2018] [Accepted: 07/18/2019] [Indexed: 12/12/2022] Open
Abstract
Diurnal light-dark cycle resets the master clock, while timed food intake is another potent synchronizer of peripheral clocks in mammals. As the largest metabolic organ, the liver sensitively responds to the food signals and secretes hepatokines, leading to the robust regulation of metabolic and clock processes. However, it remains unknown which hepatokine mediates the food-driven resetting of the liver clock independent of the master clock. Here, we identify Angptl8 as a hepatokine that resets diurnal rhythms of hepatic clock and metabolic genes in mice. Mechanistically, the resetting function of Angptl8 is dependent on the signal relay of the membrane receptor PirB, phosphorylation of kinases and transcriptional factors, and consequently transient activation of the central clock gene Per1. Importantly, inhibition of Angptl8 signaling partially blocks food-entrained resetting of liver clock in mice. We have thus identified Angptl8 as a key regulator of the liver clock in response to food.
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35
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Liao Z, Wu X, Song Y, Luo R, Yin H, Zhan S, Li S, Wang K, Zhang Y, Yang C. Angiopoietin-like protein 8 expression and association with extracellular matrix metabolism and inflammation during intervertebral disc degeneration. J Cell Mol Med 2019; 23:5737-5750. [PMID: 31211513 PMCID: PMC6653761 DOI: 10.1111/jcmm.14488] [Citation(s) in RCA: 37] [Impact Index Per Article: 7.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/14/2018] [Revised: 05/12/2019] [Accepted: 05/23/2019] [Indexed: 12/28/2022] Open
Abstract
Intervertebral disc degeneration (IDD) is considered the primary culprit for low back pain. Although the underlying mechanisms remain unknown, hyperactive catabolism of the extracellular matrix (ECM) and inflammation are suggested to play critical roles in IDD progression. This study was designed to elucidate the role of angiopoietin-like protein 8 (ANGPTL8) in the progression of IDD, especially the relationship of ANGPTL8 with ECM metabolism and inflammation. A positive association between ANGPTL8 expression and degenerative grades of IDD was detected in the analysis of human nucleus pulposus tissue samples. Silencing of ANGPTL8 attenuated the degradation of the anabolic protein type collagen II, and reduced the expression of the catabolic proteins MMP3 and MMP9, and the inflammatory cytokine IL-6 through inhibition of NF-κB signalling activation. In addition, the effect of ANGPTL8 was evaluated in a rat model of puncture-induced IDD. Based on the imaging results and histological examination in animal study, knockdown of ANGPTL8 was demonstrated to ameliorate the IDD progression. These results demonstrate the detrimental role of ANGPTL8 expression in the pathogenesis of IDD and may provide a new therapeutic target for IDD treatment.
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Affiliation(s)
- Zhiwei Liao
- Department of OrthopaedicsUnion Hospital, Tongji Medical College, Huazhong University of Science and TechnologyWuhanChina
| | - Xinghuo Wu
- Department of OrthopaedicsUnion Hospital, Tongji Medical College, Huazhong University of Science and TechnologyWuhanChina
| | - Yu Song
- Department of OrthopaedicsUnion Hospital, Tongji Medical College, Huazhong University of Science and TechnologyWuhanChina
| | - Rongjin Luo
- Department of OrthopaedicsUnion Hospital, Tongji Medical College, Huazhong University of Science and TechnologyWuhanChina
| | - Huipeng Yin
- Department of OrthopaedicsUnion Hospital, Tongji Medical College, Huazhong University of Science and TechnologyWuhanChina
| | - Shengfeng Zhan
- Department of OrthopaedicsUnion Hospital, Tongji Medical College, Huazhong University of Science and TechnologyWuhanChina
| | - Shuai Li
- Department of OrthopaedicsUnion Hospital, Tongji Medical College, Huazhong University of Science and TechnologyWuhanChina
| | - Kun Wang
- Department of OrthopaedicsUnion Hospital, Tongji Medical College, Huazhong University of Science and TechnologyWuhanChina
| | - Yukun Zhang
- Department of OrthopaedicsUnion Hospital, Tongji Medical College, Huazhong University of Science and TechnologyWuhanChina
| | - Cao Yang
- Department of OrthopaedicsUnion Hospital, Tongji Medical College, Huazhong University of Science and TechnologyWuhanChina
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36
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ANGPTL8 regulates adipocytes differentiation and adipogenesis in bovine. Gene 2019; 707:93-99. [PMID: 31048067 DOI: 10.1016/j.gene.2019.04.048] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/08/2018] [Revised: 03/20/2019] [Accepted: 04/17/2019] [Indexed: 12/17/2022]
Abstract
The formation of bovine adipose tissue involves complex developmental and physiological processes that play a vital role in determining the quality of beef; however, the regulatory mechanisms are largely unknown. Angiopoietin-like protein 8 (ANGPTL8) has been reported to be involved in the development of adipose tissue; however, the mechanism of adipogenesis which is regulated by ANGPTL8 has not been revealed in cattle. In this study, RT-qPCR and Oil Red O staining were performed to detect the expression of ANGPTL8 and adipocyte differentiation in bovine. We found that ANGPTL8 had a high expression level in adipose tissue and that the expression pattern was consistent with those of PPARγ, C/EBPα and LPL which are key regulators and transcription factors involved in preadipocyte differentiation and adipogenesis. The overexpression of ANGPTL8 by the adenovirus vector promoted lipid droplet formation in adipocytes. Thus, we speculated that ANGPTL8 could significantly enhance lipid deposition. Moreover, the expression of LPL and SREBP1, key genes inhibiting adipogenesis, was significantly decreased by ANGPTL8 overexpression. These results suggested that ANGPTL8 promotes adipocyte differentiation. In conclusion, we consider that ANGPTL8 regulates adipocyte differentiation and adipogenesis in bovine.
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37
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A long noncoding RNA LOC103690121 promotes hippocampus neuronal apoptosis in streptozotocin-induced type 1 diabetes. Neurosci Lett 2019; 703:11-18. [PMID: 30851305 DOI: 10.1016/j.neulet.2019.03.006] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/17/2018] [Revised: 01/07/2019] [Accepted: 03/05/2019] [Indexed: 12/16/2022]
Abstract
Diabetes related cognitive impairment is a severe complication. The diabetes-induced cognitive impairment is associated with insulin resistance and glucose-induced neuron apoptosis in the brain. We intended to investigate the association of long non-coding RNAs with diabetes-induced cognitive impairment in rats. Here, Type 1diabetes (T1D) rat model was induced using streptozotocin (STZ). The diabetic rats showed significant cognitive dysfunction, with increased latency period to find the hidden platform during morris water maze test. The brain injury and reduced neuronsin STZ-induced diabetic rats was determined using hematoxylin and eosin staining and Nissl's staining. We performed the LncRNA microarray analysis and identified 101 differentially expressed lncRNAs in streptozotocin (STZ)-induced type 1 diabetes (T1D) comparing with control. Among these lncRNA, LOC103690121 was upregulated. in vitro glucose treatment in hippocampal neurons showed LOC103690121 and neuron apoptosis was increased by glucose treatment. Transfection experiments showed LOC103690121 overexpression promoted neuron apoptosis, and its inhibition suppressed glucose-induced apoptosis. Western blot analysis showed that the expression profiles of apoptosis related proteins (cleaved-caspase-3, -8, -9, and Bax) were in line with LOC103690121 expression, while the profiles of Bcl-2 and PI3K/Akt signaling pathway was contrast to LOC103690121 expression. In conclusion, the results of our study confirmed lncRNA LOC103690121 promoted STZ-induced cognitive impairment in diabetic rats by promoting neuron apoptosis through PI3K/Akt signaling pathway.
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38
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Siddiqa A, Cirillo E, Tareen SHK, Ali A, Kutmon M, Eijssen LMT, Ahmad J, Evelo CT, Coort SL. Biological Pathways Leading From ANGPTL8 to Diabetes Mellitus-A Co-expression Network Based Analysis. Front Physiol 2019; 9:1841. [PMID: 30627105 PMCID: PMC6309236 DOI: 10.3389/fphys.2018.01841] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/01/2018] [Accepted: 12/06/2018] [Indexed: 01/11/2023] Open
Abstract
Angiopoietin like protein 8 (ANGPTL8) is a newly identified hormone with unique nature due to its ability to regulate both glucose and lipid metabolic pathways. It is characterized as an important molecular player of insulin induced nutrient storage and utilization pathway during fasting to re-feeding metabolic transition. Several studies have contributed to increase our knowledge regarding its function and mechanism of action. Moreover, its altered expression levels have been observed in Insulin Resistance, Diabetes Mellitus (Types I & II) and Non Alcohlic Fatty Liver Disease emphasizing its assessment as a drug target. However, there is still a great deal of information that remains to be investigated including its associated biological processes, partner proteins in these processes, its regulators and its association with metabolic pathogenesis. In the current study, the analysis of a transcriptomic data set was performed for functional assessment of ANGPTL8 in liver. Weighted Gene Co-expression Network Analysis coupled with pathway analysis tools was performed to identify genes that are significantly co-expressed with ANGPTL8 in liver and investigate their presence in biological pathways. Gene ontology term enrichment analysis was performed to select the gene ontology classes that over-represent the hepatic ANGPTL8-co-expressed genes. Moreover, the presence of diabetes linked SNPs within the genes set co-expressed with ANGPTL8 was investigated. The co-expressed genes of ANGPTL8 identified in this study (n = 460) provides narrowed down list of molecular targets which are either co-regulated with it and/or might be regulation partners at different levels of interaction. These results are coherent with previously demonstrated roles and regulators of ANGPTL8. Specifically, thirteen co-expressed genes (MAPK8, CYP3A4, PIK3R2, PIK3R4,PRKAB2, G6PC, MAP3K11, FLOT1, PIK3C2G, SHC1, SLC16A2, and RAPGEF1) are also present in the literature curated pathway of ANGPTL8 (WP39151). Moreover, the gene-SNP analysis of highly associated biological processes with ANGPTL8 revealed significant genetic signals associated to Diabetes Mellitus and similar phenotypic traits. It provides meaningful insights on the influencing genes involved and co-expressed in these pathways. Findings of this study have implications in functional characterization of ANGPTL8 with emphasis on the identified genes and pathways and their possible involvement in the pathogenesis of Diabetes Mellitus and Insulin Resistance.
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Affiliation(s)
- Amnah Siddiqa
- Research Centre for Modeling and Simulation, National University of Sciences and Technology, Islamabad, Pakistan.,Department of Bioinformatics - BiGCaT, NUTRIM School of Nutrition and Translational Research in Metabolism, Maastricht University, Maastricht, Netherlands
| | - Elisa Cirillo
- Department of Bioinformatics - BiGCaT, NUTRIM School of Nutrition and Translational Research in Metabolism, Maastricht University, Maastricht, Netherlands
| | - Samar H K Tareen
- Maastricht Centre for Systems Biology(MaCSBio), Maastricht University, Maastricht, Netherlands
| | - Amjad Ali
- Atta-ur-Rahman School of Applied Biosciences, National University of Sciences and Technology, Islamabad, Pakistan
| | - Martina Kutmon
- Department of Bioinformatics - BiGCaT, NUTRIM School of Nutrition and Translational Research in Metabolism, Maastricht University, Maastricht, Netherlands.,Maastricht Centre for Systems Biology(MaCSBio), Maastricht University, Maastricht, Netherlands
| | - Lars M T Eijssen
- Department of Bioinformatics - BiGCaT, NUTRIM School of Nutrition and Translational Research in Metabolism, Maastricht University, Maastricht, Netherlands
| | - Jamil Ahmad
- Research Centre for Modeling and Simulation, National University of Sciences and Technology, Islamabad, Pakistan.,Department of Computer Science and Information Technology, University of Malakand, Chakdara, Pakistan
| | - Chris T Evelo
- Department of Bioinformatics - BiGCaT, NUTRIM School of Nutrition and Translational Research in Metabolism, Maastricht University, Maastricht, Netherlands.,Maastricht Centre for Systems Biology(MaCSBio), Maastricht University, Maastricht, Netherlands
| | - Susan L Coort
- Department of Bioinformatics - BiGCaT, NUTRIM School of Nutrition and Translational Research in Metabolism, Maastricht University, Maastricht, Netherlands
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Liu J, Yang K, Xiao W, Le Y, Lang S, Zhang J, Wei R, Yang J, Hong T. GLP-1 receptor agonists stimulate ANGPTL8 production through the PI3K/Akt pathway in a GLP-1 receptor-dependent manner. Peptides 2018; 106:83-90. [PMID: 30003931 DOI: 10.1016/j.peptides.2018.07.001] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/19/2018] [Revised: 06/20/2018] [Accepted: 07/02/2018] [Indexed: 12/17/2022]
Abstract
The level of serum angiopoietin-like protein 8 (ANGPTL8), a novel hepatokine, is associated with obesity and type 2 diabetes mellitus (T2DM). The aims of this study were to investigate whether serum ANGPTL8 level in patients with T2DM was affected by treatment with exenatide, a glucagon-like peptide-1 receptor (GLP-1R) agonist, and to determine whether and how GLP-1R agonists regulated ANGPTL8 production in hepatocytes. A multiple-center trial was conducted in China. Among 240 patients with T2DM enrolled in this trial, 195 patients adhered to a 16-week exenatide treatment and follow-up. Human liver cell line HepG2 cells were incubated for 24 h with either exendin-4 (a native form of exenatide) or liraglutide in the presence or absence of GLP-1R antagonist exendin (9-39) and PI3K inhibitor LY294002. Change of serum ANGPTL8 level in patients with T2DM and regulation of ANGPTL8 production by the GLP-1R agonists in HepG2 cells were evaluated. Results showed that compared with baseline, exenatide treatment significantly increased serum ANGPTL8 level, and lowered body weight, fasting blood glucose (FBG) and glycated hemoglobin A1c (HbA1c) in patients with T2DM (all P < 0.05). The exenatide treatment-mediated upregulation of serum ANGPTL8 level was not associated with the levels of its lowering effects on body weight, FBG and HbA1c stratified by the median. Moreover, exendin-4 or liraglutide dose-dependently upregulated the level of ANGPTL8 expression and secretion in HepG2 cells, which was eliminated by adding exendin (9-39) and LY294002. In conclusion, GLP-1R agonists enhance ANGPTL8 production in vivo and in vitro, which is mediated via the PI3K/Akt pathway in a GLP-1R-dependent manner.
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Affiliation(s)
- Junling Liu
- Department of Endocrinology and Metabolism, Peking University Third Hospital, Beijing 100191, China
| | - Kun Yang
- Department of Endocrinology and Metabolism, Peking University Third Hospital, Beijing 100191, China
| | - Wenhua Xiao
- Department of Endocrinology and Metabolism, Peking University Third Hospital, Beijing 100191, China
| | - Yunyi Le
- Department of Endocrinology and Metabolism, Peking University Third Hospital, Beijing 100191, China
| | - Shan Lang
- Department of Endocrinology and Metabolism, Peking University Third Hospital, Beijing 100191, China
| | - Jingjing Zhang
- Department of Endocrinology and Metabolism, Peking University Third Hospital, Beijing 100191, China
| | - Rui Wei
- Department of Endocrinology and Metabolism, Peking University Third Hospital, Beijing 100191, China
| | - Jin Yang
- Department of Endocrinology and Metabolism, Peking University Third Hospital, Beijing 100191, China.
| | - Tianpei Hong
- Department of Endocrinology and Metabolism, Peking University Third Hospital, Beijing 100191, China.
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Huang Y, Chen X, Chen X, Feng Y, Guo H, Li S, Dai T, Jiang R, Zhang X, Fang C, Hu J. Angiopoietin-like protein 8 in early pregnancy improves the prediction of gestational diabetes. Diabetologia 2018; 61:574-580. [PMID: 29167926 DOI: 10.1007/s00125-017-4505-y] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/14/2017] [Accepted: 10/16/2017] [Indexed: 12/13/2022]
Abstract
AIMS/HYPOTHESIS Screening high-risk individuals for gestational diabetes mellitus (GDM) in early pregnancy conventionally relies on established maternal risk factors; however, the sensitivity and specificity of these factors are not satisfactory. The present study aimed to determine whether the concentration of angiopoietin-like protein 8 (ANGPTL8), either alone or combined with other risk factors in early pregnancy, could be used to predict subsequent GDM. METHODS From August 2015 to January 2016, 474 women receiving prenatal care at around 12-16 weeks of gestation were recruited into the study. ANGPTL8 levels were measured at the first prenatal visit. All the participants received a 75 g OGTT during weeks 24-28 of gestation. RESULTS ANGPTL8 levels in early pregnancy were considerably higher in women who developed GDM than those who maintained normal glucose tolerance (2822 ± 938 vs 2120 ± 1118 pg/ml, respectively; p < 0.0001). Multivariable logistic regression revealed that ANGPTL8 levels were significantly associated with risk of GDM independent of conventional risk factors. In addition, women in the highest quartile of ANGPTL8 concentration had an 8.75-fold higher risk of developing GDM compared with women in the lowest quartile (OR8.75, 95%CI 2.43, 31.58). More importantly, incorporating ANGPTL8 into the conventional prediction model significantly increased the AUC for prediction of GDM (0.772vs 0.725; p = 0.019). CONCLUSIONS Our study suggests that ANGPTL8 levels in early pregnancy are significantly and independently associated with risk of GDM at 24-28 weeks of gestation. Combining ANGPTL8 levels with conventional risk factors could thus improve the prediction of GDM.
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Affiliation(s)
- Yun Huang
- Department of Endocrinology, The Second Affiliated Hospital of Soochow University, 1055 Sanxiang Road, Suzhou, Jiangsu, People's Republic of China
| | - Xin Chen
- Department of Gynaecology and Obstetrics, The Second Affiliated Hospital of Soochow University, Jiangsu, People's Republic of China
| | - Xiaohong Chen
- Department of Endocrinology, The Second Affiliated Hospital of Soochow University, 1055 Sanxiang Road, Suzhou, Jiangsu, People's Republic of China
| | - Yu Feng
- Department of Endocrinology, The Second Affiliated Hospital of Soochow University, 1055 Sanxiang Road, Suzhou, Jiangsu, People's Republic of China
| | - Heming Guo
- Department of Endocrinology, The Second Affiliated Hospital of Soochow University, 1055 Sanxiang Road, Suzhou, Jiangsu, People's Republic of China
| | - Sicheng Li
- Department of Endocrinology, The Second Affiliated Hospital of Soochow University, 1055 Sanxiang Road, Suzhou, Jiangsu, People's Republic of China
| | - Ting Dai
- Department of Endocrinology, The Second Affiliated Hospital of Soochow University, 1055 Sanxiang Road, Suzhou, Jiangsu, People's Republic of China
| | - Rong Jiang
- Department of Endocrinology, The Second Affiliated Hospital of Soochow University, 1055 Sanxiang Road, Suzhou, Jiangsu, People's Republic of China
| | - Xiaoyan Zhang
- Department of Endocrinology, The Second Affiliated Hospital of Soochow University, 1055 Sanxiang Road, Suzhou, Jiangsu, People's Republic of China
| | - Chen Fang
- Department of Endocrinology, The Second Affiliated Hospital of Soochow University, 1055 Sanxiang Road, Suzhou, Jiangsu, People's Republic of China.
| | - Ji Hu
- Department of Endocrinology, The Second Affiliated Hospital of Soochow University, 1055 Sanxiang Road, Suzhou, Jiangsu, People's Republic of China.
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Pan ZG, An XS. SARM1 deletion restrains NAFLD induced by high fat diet (HFD) through reducing inflammation, oxidative stress and lipid accumulation. Biochem Biophys Res Commun 2018; 498:416-423. [PMID: 29454967 DOI: 10.1016/j.bbrc.2018.02.115] [Citation(s) in RCA: 28] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/11/2018] [Accepted: 02/13/2018] [Indexed: 12/12/2022]
Abstract
SARM1 (Sterile alpha and armadillo motif-containing protein 1) is the recently identified TIR domain-containing cytosolic protein, which is involved in toll-like receptors (TLRs) signaling transduction. In the present study, the role of SARM1 in high fat diet (HFD)-induced non-alcoholic fatty liver disease (NAFLD) progression was explored. We found that SARM1 was expressed highly in fatty liver. And SARM1-knockout (KO) reduced steatohepatitis and metabolic disorders induced by HFD. SARM1-deletion decreased aspartate aminotransferase (AST) and alanine aminotransferase (ALT) levels in HFD-fed mice. Additionally, inflammatory response caused by HFD was alleviated by SARM1-deletion through inactivating TLR4/7/9 and nuclear factor kappa B (NF-κB) pathways. Of note, SARM1-deletion also reduced the expressions of inflammation-associated molecules in hypothalamus of HFD-fed mice. Furthermore, HFD administration led to oxidative stress in liver of mice, while being decreased in SARM1-KO mice. Moreover, SARM1-ablation improved lipid dyslipidemia by suppressing the mRNA levels of genes, linked to glycolysis, lipogenesis and transcriptional regulation. Insulin resistance was also attenuated by SARM1-deficiency through enhancing the activation of liver Akt/glycogen synthase kinase-3β (GSK3β) and insulin receptor substrate-1 (IRS1)/FOXO1 pathways in HFD-fed mice. Also, SARM1-knockout improved neuropeptide Y (NPY), Pro-Opiomelanocortins (POMC), Agouti-related Protein (AGRP) and Cocaine-and-Amphetamine Responsive Transcript 1 (CART1) expressions in hypothalamus of mice after HFD administration. In vitro, we found that the reduction of inflammatory response, oxidative stress and dyslipidemia induced by SARM1-knockout in primary hepatocytes after fructose stimulation was largely attributed to its suppression to TLR4/7/9. Together, the findings demonstrated that SARM1 might be an effective target for developing effective therapeutic strategies against NAFLD.
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Affiliation(s)
- Zhen-Guo Pan
- Department of Gastroenterology, Huai'an First People's Hospital, Nanjing Medical University, 6 Beijing Road West, Huai'an, Jiangsu 223300, PR China
| | - Xu-Sheng An
- Intensive Care Unit, Huai'an First People's Hospital, Nanjing Medical University, 6 Beijing Road West, Huai'an, Jiangsu 223300, PR China.
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Luo M, Peng D. ANGPTL8: An Important Regulator in Metabolic Disorders. Front Endocrinol (Lausanne) 2018; 9:169. [PMID: 29719529 PMCID: PMC5913278 DOI: 10.3389/fendo.2018.00169] [Citation(s) in RCA: 41] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/24/2017] [Accepted: 03/28/2018] [Indexed: 12/26/2022] Open
Abstract
Long-term controversy regarding the role of angiopoietin-like protein 8 (ANGPTL8) in beta-cell proliferation and diabetes progression made it a research spotlight. Recently, the controversy was resolved. Although ANGPTL8 could not control beta-cell expansion and islet function, ANGPTL8 was still considered as a novel but atypical member in the ANGPTL family because of its unique structure and crucial effects on lipid metabolism. Besides, ANGPTL8 also participated in some other disorders such as non-alcoholic fatty liver disease and renal dysfunction. Understanding the features of ANGPTL8 may offer new diagnostic and therapeutic approaches to metabolic-related diseases. Therefore, we reviewed most recent findings about ANGPTL8 and aimed to provide an integrated picture of ANGPTL8.
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43
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Cloning, expression, and spectral analysis of mouse betatrophin. Med J Islam Repub Iran 2017; 31:102. [PMID: 29951403 PMCID: PMC6014755 DOI: 10.14196/mjiri.31.102] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/29/2017] [Accepted: 12/18/2017] [Indexed: 12/11/2022] Open
Abstract
Background: Betatrophin, a novel secretory protein from liver and fatty tissues, is believed to be involved in lipid and glucose metabolism. However, its precise physiological role remains unclear. Here, we report the cloning, expression, and purification steps of mouse betatrophin in a prokaryotic system, followed by its structural analysis. Methods: Specific cloning primers were used to amplify the coding sequence of mouse liver betatrophin. The product was cloned into pET28 and expressed in E.coli BL21 (DE3) cells. The suitability of the refolding procedure was assessed by determining secondary structures of the initial and refolded proteins using circular dichroism spectroscopy. Results: The polymerase chain reaction resulted in a 549 bp nucleotide sequence, encoding a 183 amino acid polypeptide, with an apparent molecular weight of 21 kDa, which was expressed in an inclusion body. Following an optimization and refolding procedure, the recombinant protein was purified by anion exchange and metal affinity chromatography. CD spectra revealed that the refolded protein has suitable configuration. Conclusion: We believe that the produced betatrophin is suitable for further biochemical studies on glucose and lipid metabolism.
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Xian HM, Che H, Qin Y, Yang F, Meng SY, Li XG, Bai YL, Wang LH. Coriolus versicolor aqueous extract ameliorates insulin resistance with PI3K/Akt and p38 MAPK signaling pathways involved in diabetic skeletal muscle. Phytother Res 2017; 32:551-560. [PMID: 29243310 DOI: 10.1002/ptr.6007] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/31/2017] [Revised: 09/13/2017] [Accepted: 11/13/2017] [Indexed: 01/16/2023]
Affiliation(s)
- Hui-min Xian
- Department of Endocrinology; The Second affiliated Hospital of Harbin Medical University; Harbin Heilongjiang Province 150001 China
| | - Hui Che
- Department of Endocrinology; The Second affiliated Hospital of Harbin Medical University; Harbin Heilongjiang Province 150001 China
| | - Ying Qin
- Department of Endocrinology; The Second affiliated Hospital of Harbin Medical University; Harbin Heilongjiang Province 150001 China
- Department of Pharmacology; College of Pharmacy, Harbin Medical University; Harbin Heilongjiang Province 150001 China
| | - Fan Yang
- Department of Endocrinology; The Second affiliated Hospital of Harbin Medical University; Harbin Heilongjiang Province 150001 China
| | - Song-yan Meng
- Department of Endocrinology; The Second affiliated Hospital of Harbin Medical University; Harbin Heilongjiang Province 150001 China
| | - Xiao-guang Li
- Academician Workstation; Harbin Medical University; Harbin Heilongjiang Province 150001 China
| | - Yun-long Bai
- Department of Pharmacology; College of Pharmacy, Harbin Medical University; Harbin Heilongjiang Province 150001 China
- Institute of Chronic Disease; Heilongjiang Academy of Medical Science; Harbin Heilongjiang Province 150001 China
| | - Li-hong Wang
- Department of Endocrinology; The Second affiliated Hospital of Harbin Medical University; Harbin Heilongjiang Province 150001 China
- Institute of Chronic Disease; Heilongjiang Academy of Medical Science; Harbin Heilongjiang Province 150001 China
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Wang S, Hong X, Tu Z, Yuan G. Angiopoietin-like protein 8: An attractive biomarker for the evaluation of subjects with insulin resistance and related disorders. Diabetes Res Clin Pract 2017; 133:168-177. [PMID: 28965028 DOI: 10.1016/j.diabres.2017.08.025] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/13/2017] [Revised: 08/01/2017] [Accepted: 08/30/2017] [Indexed: 12/28/2022]
Abstract
Insulin resistance is prevalent worldwide and is associated with many metabolic diseases, in particular, type 2 diabetes mellitus (T2DM), obesity, nonalcoholic fatty liver disease (NAFLD), polycystic ovary syndrome (PCOS) and metabolic syndrome (MetS). Angiopoietin-like protein 8 (ANGPTL8), a newly-identified secreted protein composing of 198 amino acids, is enriched in the liver of human. Considering its promising potential for β-cell proliferation and therapeutic prospect for diabetes, ANGPTL8 has aroused extensive interests. However, a recent collaborative study confirmed that ANGPTL8 didn't stimulate dramatic β-cell regeneration. At present, a controversial scientific discussion on whether and how ANGPTL8 regulate insulin resistance has been ongoing. Interestingly, several in vitro and in vivo studies have suggested the complex roles of ANGPTL8 in insulin resistance. Data resulting from cross-sectional and longitudinal researches in human individuals involving the influence of ANGPTL8 on the development of insulin resistance were controversial. We therefore summarize currently clinical literature to exploit whether this exciting hormone could be applied for clinical application asa potential clinical biomarker to predict insulin resistance and related disorders.
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Affiliation(s)
- Su Wang
- Department of Endocrinology, Affiliated Jiangning Hospital of Nanjing Medical University, Nanjing, China; Department of Endocrinology, Affiliated Hospital of Jiangsu University, Zhenjiang, China
| | - Xiafei Hong
- Department of Endocrinology, Affiliated Hospital of Jiangsu University, Zhenjiang, China
| | - Zhigang Tu
- Institute of Life Sciences, Jiangsu University, Zhenjiang, China
| | - Guoyue Yuan
- Department of Endocrinology, Affiliated Hospital of Jiangsu University, Zhenjiang, China.
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46
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Insulin upregulates betatrophin expression via PI3K/Akt pathway. Sci Rep 2017; 7:5594. [PMID: 28717133 PMCID: PMC5514142 DOI: 10.1038/s41598-017-06052-y] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/06/2016] [Accepted: 06/07/2017] [Indexed: 12/24/2022] Open
Abstract
Betatrophin is regarded as a liver-produced hormone induced by insulin resistance (IR). However, it remains largely unknown how IR regulates betatrophin expression. To study whether IR could regulate betatrophin expression and the corresponding molecular mechanisms, betatrophin levels were examined in 6 in vitro IR models which were established using human hepatocytes L02 with different agents, including tumor necrosis factor-α, interleukin-1β, dexamethasone, palmitate, high glucose and insulin and betatrophin levels were elevated only in the insulin group. These results suggest that it is insulin, not IR that promotes betatrophin expression. In the meantime, PI3K/Akt pathway was activated by insulin and suppressed by above agents that caused IR. Insulin-upregulated betatrophin expression was suppressed by PI3K/Akt inhibitors and IR, suggesting that insulin upregulates and IR decreases betatrophin production through PI3K/Akt pathway. Consistently, the treatment of insulin in mice dose-dependently upregulated betatrophin levels, and the administration of metformin in IR mice also stimulated betatrophin production since published study showed metformin improved PI3K/Akt pathway and IR. In humans, compared with those without insulin treatment, serum betatrophin levels were increased in type 2 diabetic patients with insulin treatment. In conclusion, insulin stimulates betatrophin secretion through PI3K/Akt pathway and IR may play an opposite role.
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47
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Li Y, Yang P, Chang Q, Wang J, Liu J, Lv Y, Wang TTY, Gao B, Zhang Y, Yu LL. Inhibitory Effect of Piceatannol on TNF-α-Mediated Inflammation and Insulin Resistance in 3T3-L1 Adipocytes. JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY 2017; 65:4634-4641. [PMID: 28535046 DOI: 10.1021/acs.jafc.7b01567] [Citation(s) in RCA: 26] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
Piceatannol, a bioactive component in grape and blueberry, was examined for its potential in decreasing the inflammatory activities in adipocytes using a cocultured adipocyte and macrophage system, and suppressing tumor necrosis factor-α (TNF-α)-mediated inflammation and the related insulin resistance using a 3T3-L1 adipocyte model. Piceatannol at 10 μM significantly reduced the release of inflammatory cytokines of TNF-α and monocyte chemoattractant protein-1 (MCP-1) by 19 and 31% in the cocultured system, respectively. Pretreatment with piceatannol also inhibited TNF-α-induced expression of interleukin-6 (IL-6) and MCP-1 at both mRNA and protein levels in the 3T3-L1 adipocytes. Piceatannol also partially improved the malfunction of insulin-stimulated glucose uptake, which was reduced by TNF-α in 3T3-L1 adipocytes. Furthermore, the inhibitions were mediated by significant blocking of IκBα phosphorylation and nuclear factor-κB (NF-κB) activation through suppressing nuclear translocation of NF-κB p65 along with c-Jun N-terminal kinase (JNK)-mitogen activated protein kinase (MAPK) activation. In addition, the Akt-dependent forkhead box O1 (FoxO1) signaling pathway was involved in the restoration of insulin-stimulated glucose uptake through suppressing the down-regulation of phosphorylation of Akt and FoxO1 expressions. These results suggested the potential of piceatannol in improving chronic inflammatory condition and insulin sensitivity in obese adipose tissues.
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Affiliation(s)
- Yanfang Li
- Beijing Advanced Innovation Center for Food Nutrition and Human Health, Beijing Technology & Business University , Beijing 100048, China
- Institute of Food and Nutraceutical Science, School of Agriculture and Biology, Shanghai Jiao Tong University , Shanghai 200240, China
| | - Puyu Yang
- Institute of Food and Nutraceutical Science, School of Agriculture and Biology, Shanghai Jiao Tong University , Shanghai 200240, China
| | - Qimeng Chang
- Department of Surgery, Fudan University Minhang Hospital , Shanghai 201199, China
| | - Jing Wang
- Beijing Advanced Innovation Center for Food Nutrition and Human Health, Beijing Technology & Business University , Beijing 100048, China
| | - Jie Liu
- Beijing Advanced Innovation Center for Food Nutrition and Human Health, Beijing Technology & Business University , Beijing 100048, China
| | - Yuan Lv
- Institute of Food and Nutraceutical Science, School of Agriculture and Biology, Shanghai Jiao Tong University , Shanghai 200240, China
| | - Thomas T Y Wang
- Diet, Genomics, and Immunology Laboratory, Agricultural Research Service (ARS), U.S. Department of Agriculture , Beltsville, Maryland 20705, United States
| | - Boyan Gao
- Department of Nutrition and Food Science, University of Maryland , College Park, Maryland 20742, United States
| | - Yaqiong Zhang
- Institute of Food and Nutraceutical Science, School of Agriculture and Biology, Shanghai Jiao Tong University , Shanghai 200240, China
| | - Liangli Lucy Yu
- Department of Nutrition and Food Science, University of Maryland , College Park, Maryland 20742, United States
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Mele C, Grugni G, Mai S, Vietti R, Aimaretti G, Scacchi M, Marzullo P. Circulating angiopoietin-like 8 (ANGPTL8) is a marker of liver steatosis and is negatively regulated by Prader-Willi Syndrome. Sci Rep 2017; 7:3186. [PMID: 28600576 PMCID: PMC5466606 DOI: 10.1038/s41598-017-03538-7] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/07/2017] [Accepted: 05/11/2017] [Indexed: 12/17/2022] Open
Abstract
ANGPTL8 is a liver-derived protein related to insulin-sensitivity. Its relationship with obesity and liver function in Prader-Willi syndrome (PWS) is unknown. The present study investigated circulating ANGPTL8 in PWS and controls with common obesity, assessing its association to liver steatosis. For this purpose, 20 obese PWS and 20 controls matched for body mass index (BMI), sex and age underwent analysis of ANGPTL8 levels, glucose and lipid metabolism. Liver function tests and degree of liver steatosis by ultrasonography (US), fat-free mass (FFM) and fat mass (FM) by dual-energy x-ray absorptiometry (DEXA) were also assessed. In comparison to controls, obese PWS showed lower values of FFM (p < 0.0001) and higher FM (p = 0.01), while harbouring higher HDL cholesterol, lower triglycerides and OGTT-derived insulin levels, as well as a lower prevalence and severity of liver steatosis. With respect to obese controls, ANGPTL8 levels were significantly lower in PWS (p = 0.007) and overall correlated with transaminase levels and the severity of liver steatosis, as well as FFM (p < 0.05 for all). By a stepwise multivariable regression analysis, ANGPTL8 levels were independently predicted by PWS status (p = 0.01) and liver steatosis (p < 0.05). In conclusion, ANGPTL8 levels are lower in PWS than obese controls and are inversely associated with the severity of liver steatosis. Further studies should investigate the potential genetic basis for this observation.
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Affiliation(s)
- Chiara Mele
- Division of General Medicine, Ospedale S. Giuseppe, Istituto Auxologico Italiano, via Cadorna 90, 28824, Piancavallo di Oggebbio (VB), Italy
- Department of Translational Medicine, University of Piemonte Orientale, via Solaroli 17, 28100, Novara, Italy
| | - Graziano Grugni
- Division of Auxology, Ospedale S. Giuseppe, Istituto Auxologico Italiano, via Cadorna 90, 28824, Piancavallo di Oggebbio (VB), Italy
| | - Stefania Mai
- Laboratory of Metabolic Research, Ospedale S. Giuseppe, Istituto Auxologico Italiano, via Cadorna 90, 28824, Piancavallo di Oggebbio (VB), Italy
| | - Roberta Vietti
- Laboratory of Metabolic Research, Ospedale S. Giuseppe, Istituto Auxologico Italiano, via Cadorna 90, 28824, Piancavallo di Oggebbio (VB), Italy
| | - Gianluca Aimaretti
- Department of Translational Medicine, University of Piemonte Orientale, via Solaroli 17, 28100, Novara, Italy
| | - Massimo Scacchi
- Division of General Medicine, Ospedale S. Giuseppe, Istituto Auxologico Italiano, via Cadorna 90, 28824, Piancavallo di Oggebbio (VB), Italy
| | - Paolo Marzullo
- Division of General Medicine, Ospedale S. Giuseppe, Istituto Auxologico Italiano, via Cadorna 90, 28824, Piancavallo di Oggebbio (VB), Italy.
- Department of Translational Medicine, University of Piemonte Orientale, via Solaroli 17, 28100, Novara, Italy.
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Angiopoietin-like protein 8/betatrophin as a new determinant of type 2 diabetes remission after bariatric surgery. Transl Res 2017; 184:35-44.e4. [PMID: 28347650 DOI: 10.1016/j.trsl.2017.03.001] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/07/2016] [Revised: 02/06/2017] [Accepted: 03/02/2017] [Indexed: 01/02/2023]
Abstract
This work aimed to explore the link between angiopoietin-like protein 8 (ANGPTL8) and weight loss after metabolic surgery. In the cross-sectional study (n = 100), circulating ANGPTL8 concentrations were significantly lower in morbidly obese than in lean subjects, and strikingly lower in morbidly obese patients with type 2 diabetes mellitus (T2DM). Conversely, ANGPTL8 expression in subcutaneous adipose tissue (SAT) was higher in morbidly obese patients, particularly in those with T2DM, whereas its expression in visceral adipose tissue was unchanged. The main predictors for circulating levels of ANGPTL8 were BMI and T2DM, whereas ANGPTL8 expression in SAT was determined by the presence of T2DM. The prospective cohort studies before and 1 year after bariatric surgery in morbidly obese patients with (n = 45) and without (n = 30) T2DM, revealed a significant increase of circulating ANGPTL8 levels 1 year after the bariatric surgery. Intriguingly, this increment, which was predicted by basal ANGPTL8 concentrations, appeared as a determinant of T2DM remission. In conclusion, circulating ANGPTL8 levels have an inverse relationship with SAT expression. Low basal levels of ANGPTL8 rebound after bariatric surgery. The increment in ANGPTL8 concentrations at 1 month of follow-up after weight loss emerged as a significant predictor of the T2DM remission at 1 year of follow-up.
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50
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Mysore R, Liebisch G, Zhou Y, Olkkonen VM, Nidhina Haridas PA. Angiopoietin-like 8 (Angptl8) controls adipocyte lipolysis and phospholipid composition. Chem Phys Lipids 2017; 207:246-252. [PMID: 28528274 DOI: 10.1016/j.chemphyslip.2017.05.002] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/07/2017] [Revised: 05/03/2017] [Accepted: 05/15/2017] [Indexed: 01/08/2023]
Abstract
Angiopoietin-like 8 (Angptl8) inhibits lipolysis in the circulation together with Angplt3 and controls post-prandial fat storage in white adipose tissue (WAT). It is strongly induced by insulin in vivo in WAT and in vitro in adipocytes. In this study we addressed the function of Angptl8 in adipocytes by its stable lentivirus-mediated knock-down in 3T3-L1 cells, followed by analyses of triglyceride (TG) storage, lipid droplet (LD) morphology, the cellular lipidome, lipolysis, and gene expression. Depletion of Angptl8 did not drastically affect the adipocyte differentiation of 3T3-L1 cells but resulted in a moderate (18-19%) reduction of stored TGs. The lipidome analysis revealed a reduction of alkyl- phosphatidylcholines (PCs) and phosphatidylethanolamine (PE) plasmalogens, as well as saturated PCs and PEs. Importantly, the Angptl8 depleted cells displayed enhanced lipolysis as measured by release of non-esterified fatty acids (NEFAs). Consistently, mRNAs encoding Angptl4 and Leptin, which facilitate lipolysis, as well as Cpt1a, Cpt1b, and Pgc-1α involved in FA oxidation, were elevated. The Angptl8 mRNA itself was suppressed by pharmacologic treatments inducing lipolysis: stimulation with the β-adrenergic agonist isoproterenol or with the adenylate cyclase activator forskolin. To conclude, knock-down of Angptl8 in adipocytes suggests that the protein acts to inhibit intracellular lipolysis, analogous to its activity in the circulation. Depletion of Angptl8 results in an altered cellular phospholipid composition. The findings identify Angptl8 as a central insulin-regulated controller of adipocyte lipid metabolism.
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Affiliation(s)
| | - Gerhard Liebisch
- Institute of Clinical Chemistry and Laboratory Medicine, University of Regensburg, Germany
| | - You Zhou
- Minerva Foundation Institute for Medical Research, Helsinki, Finland; Systems Immunity University Research Institute and Division of Infection and Immunity, School of Medicine, Cardiff University, Cardiff, United Kingdom
| | - Vesa M Olkkonen
- Minerva Foundation Institute for Medical Research, Helsinki, Finland; Department of Anatomy, Faculty of Medicine, University of Helsinki, Finland
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