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Yao Q, Liu Z, Yao A, Liu J, Jiang J, Chen Y, Li S, Han Y, Jiang Z, Qi Y. Circular RNA circTET3 mediates migration of rat vascular smooth muscle cells by targeting miR‐351‐5p. J Cell Physiol 2020; 235:6831-6842. [DOI: 10.1002/jcp.29577] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/18/2019] [Accepted: 01/13/2020] [Indexed: 12/16/2022]
Affiliation(s)
- Qing‐Ping Yao
- Institute of Mechanobiology & Medical Engineering, School of Life Sciences & BiotechnologyShanghai Jiao Tong UniversityShanghai China
| | - Ze Liu
- Institute of Mechanobiology & Medical Engineering, School of Life Sciences & BiotechnologyShanghai Jiao Tong UniversityShanghai China
| | - Ai‐Hong Yao
- Institute of Embedded Computing and IoT, College of Computer Science and TechnologyHarbin Engineering UniversityHarbin China
| | - Ji‐Ting Liu
- Institute of Mechanobiology & Medical Engineering, School of Life Sciences & BiotechnologyShanghai Jiao Tong UniversityShanghai China
| | - Jun Jiang
- Department of Surgerythe Affiliated Hospital of Southwest Medical UniversityLuzhou China
| | - Yi Chen
- Institute of Mechanobiology & Medical Engineering, School of Life Sciences & BiotechnologyShanghai Jiao Tong UniversityShanghai China
| | - Shan‐Shan Li
- Institute of Mechanobiology & Medical Engineering, School of Life Sciences & BiotechnologyShanghai Jiao Tong UniversityShanghai China
| | - Yue Han
- Institute of Mechanobiology & Medical Engineering, School of Life Sciences & BiotechnologyShanghai Jiao Tong UniversityShanghai China
| | - Zong‐Lai Jiang
- Institute of Mechanobiology & Medical Engineering, School of Life Sciences & BiotechnologyShanghai Jiao Tong UniversityShanghai China
| | - Ying‐Xin Qi
- Institute of Mechanobiology & Medical Engineering, School of Life Sciences & BiotechnologyShanghai Jiao Tong UniversityShanghai China
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Duraipandiyan V, Balamurugan R, Al-Dhabi NA, William Raja T, Ganesan P, Ahilan B, Valan Arasu M, Ignacimuthu S, Ali Esmail G. The down regulation of PTP1B expression and attenuation of disturbed glucose and lipid metabolism using Borassus flabellifer (L) fruit methanol extract in high fat diet and streptozotocin induced diabetic rats. Saudi J Biol Sci 2019; 27:433-440. [PMID: 31889867 PMCID: PMC6933253 DOI: 10.1016/j.sjbs.2019.11.004] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/12/2019] [Revised: 10/01/2019] [Accepted: 11/06/2019] [Indexed: 11/26/2022] Open
Abstract
Borassus flabellifer L. is a tall palm traditionally used for its stimulating, diuretic and anti-inflammatory activities; it is rich in fibers and various pharmacologically important secondary metabolites. This study was undertaken to evaluate the antidiabetic effects of Borassus flabellifer fruit methanol extract (BF-M) on diabetic rats induced with High Fat Diet (HFD)/streptozotocin (STZ). When BF-M (100 or 200 mg/kg) was administered for 21 days orally it led to a sharp decline in triglycerides, total cholesterol, free unsaturated fat, glucose-6-phosphate, fasting blood glucose and fructose 1,6 bisphosphatase in contrast to diabetic control. BF-M also downregulated Protein Tyrosine Phosphatase 1B. In vitro study showed the IC50 value to be 23.98 μg/mL. BF-M significantly increased serum insulin, glycogen content, and body weight. Western blot analysis exhibited significant inhibition of PTP1B in pancreatic tissue which was confirmed by histology and immunohistological studies. GC-MS analysis revelaled that the presence of major compounds such as 5-hydroxymethylfurfural (47.56%), Guanosine (21.01%) and n-hecxadeconoic acid (25.14%) in BF-M. In short, BF-M exerted antidiabetic property by down regulating PTP1B expression, and eventually enhancing glucose stimulated insulin release; it also exhibited favorable effects in diabetes and its secondary complications.
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Affiliation(s)
- V Duraipandiyan
- Department of Botany and Microbiology, College of Science, King Saud University, P.O. Box 2455, Riyadh 11451, Saudi Arabia.,Division of Ethnopharmacology, Entomology Research Institute, Loyola College, Chennai 600034, India
| | - R Balamurugan
- Division of Ethnopharmacology, Entomology Research Institute, Loyola College, Chennai 600034, India
| | - Naif Abdullah Al-Dhabi
- Department of Botany and Microbiology, College of Science, King Saud University, P.O. Box 2455, Riyadh 11451, Saudi Arabia
| | - T William Raja
- Division of Ethnopharmacology, Entomology Research Institute, Loyola College, Chennai 600034, India
| | - P Ganesan
- Division of Ethnopharmacology, Entomology Research Institute, Loyola College, Chennai 600034, India
| | - B Ahilan
- Division of Ethnopharmacology, Entomology Research Institute, Loyola College, Chennai 600034, India
| | - M Valan Arasu
- Department of Botany and Microbiology, College of Science, King Saud University, P.O. Box 2455, Riyadh 11451, Saudi Arabia
| | - S Ignacimuthu
- Division of Ethnopharmacology, Entomology Research Institute, Loyola College, Chennai 600034, India
| | - Galal Ali Esmail
- Department of Botany and Microbiology, College of Science, King Saud University, P.O. Box 2455, Riyadh 11451, Saudi Arabia
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Inhibiting Protein Tyrosine Phosphatase 1B to Improve Regenerative Functions of Endothelial Cells. J Cardiovasc Pharmacol 2019; 71:59-64. [PMID: 28817487 DOI: 10.1097/fjc.0000000000000530] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/15/2023]
Abstract
Protein tyrosine phosphatase-1B (PTP1B) is an important negative regulator of insulin receptor- and vascular endothelial growth factor receptor-dependent signalings in endothelial cells. Genetic or pharmacological inhibition of PTP1B has been shown to enhance endothelial cell proliferation and migration and increase nitric oxide production. In vivo, inhibiting PTP1B can reverse endothelial dysfunction, promote angiogenesis, and accelerate wound healing. Intense research is currently continuing in an effort to discover novel selective PTP1B inhibitors, primarily for treating insulin resistance. We propose that these drugs may also represent a new horizon for boosting the regenerative capacities of endothelial cells.
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Nemecz M, Constantin A, Dumitrescu M, Alexandru N, Filippi A, Tanko G, Georgescu A. The Distinct Effects of Palmitic and Oleic Acid on Pancreatic Beta Cell Function: The Elucidation of Associated Mechanisms and Effector Molecules. Front Pharmacol 2019; 9:1554. [PMID: 30719005 PMCID: PMC6348268 DOI: 10.3389/fphar.2018.01554] [Citation(s) in RCA: 54] [Impact Index Per Article: 10.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/27/2018] [Accepted: 12/20/2018] [Indexed: 12/13/2022] Open
Abstract
In this study, we aimed to identify the mechanisms underlying the different effects of palmitic acid and oleic acid on human pancreatic beta cell function. To address this problem, the oxidative stress, endoplasmic reticulum stress, inflammation, apoptosis and their mediator molecules have been investigated in the insulin releasing beta cells exposed to palmitic and/or oleic acid. Herein, we have demonstrated that in cultured 1.1B4 beta cells oleic acid promotes neutral lipid accumulation and insulin secretion, whereas palmitic acid is poorly incorporated into triglyceride and it does not stimulate insulin secretion from human pancreatic islets at physiologically glucose concentrations. In addition, palmitic acid caused: (1) oxidative stress through a mechanism involving increases in ROS production and MMP-2 protein expression/gelatinolytic activity associated with down-regulation of SOD2 protein; (2) endoplasmic reticulum stress by up-regulation of chaperone BiP protein and unfolded protein response (UPR) transcription factors (eIF2α, ATF6, XBP1u proteins) and by PTP-1B down-regulation in both mRNA and protein levels; (3) inflammation through enhanced synthesis of proinflammatory cytokines (IL6, IL8 proteins); and (4) apoptosis by enforced proteic expression of CHOP multifunctional transcription factor. Oleic acid alone had opposite effects due to its different capacity of controlling these metabolic pathways, in particular by reduction of the ROS levels and MMP-2 activity, down-regulation of BiP, eIF2α, ATF6, XBP1u, CHOP, IL6, IL8 and by SOD2 and PTP-1B overexpression. The supplementation of saturated palmitic acid with the monounsaturated oleic acid reversed the negative effects of palmitic acid alone regulating insulin secretion from pancreatic beta cells through ROS, MMP-2, ATF6, XBP1u, IL8 reduction and SOD2, PTP-1B activation. Our findings have shown the protective action of oleic acid against palmitic acid on beta cell lipotoxicity through promotion of triglyceride accumulation and insulin secretion and regulation of some effector molecules involved in oxidative stress, endoplasmic reticulum stress, inflammation and apoptosis.
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Affiliation(s)
- Miruna Nemecz
- Department of Pathophysiology and Pharmacology, Institute of Cellular Biology and Pathology 'Nicolae Simionescu' of Romanian Academy, Bucharest, Romania
| | - Alina Constantin
- Department of Pathophysiology and Pharmacology, Institute of Cellular Biology and Pathology 'Nicolae Simionescu' of Romanian Academy, Bucharest, Romania
| | - Madalina Dumitrescu
- Department of Pathophysiology and Pharmacology, Institute of Cellular Biology and Pathology 'Nicolae Simionescu' of Romanian Academy, Bucharest, Romania
| | - Nicoleta Alexandru
- Department of Pathophysiology and Pharmacology, Institute of Cellular Biology and Pathology 'Nicolae Simionescu' of Romanian Academy, Bucharest, Romania
| | - Alexandru Filippi
- Department of Pathophysiology and Pharmacology, Institute of Cellular Biology and Pathology 'Nicolae Simionescu' of Romanian Academy, Bucharest, Romania
| | - Gabriela Tanko
- Department of Pathophysiology and Pharmacology, Institute of Cellular Biology and Pathology 'Nicolae Simionescu' of Romanian Academy, Bucharest, Romania
| | - Adriana Georgescu
- Department of Pathophysiology and Pharmacology, Institute of Cellular Biology and Pathology 'Nicolae Simionescu' of Romanian Academy, Bucharest, Romania
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Perez-Suarez I, Ponce-González JG, de La Calle-Herrero J, Losa-Reyna J, Martin-Rincon M, Morales-Alamo D, Santana A, Holmberg HC, Calbet JAL. Severe energy deficit upregulates leptin receptors, leptin signaling, and PTP1B in human skeletal muscle. J Appl Physiol (1985) 2017; 123:1276-1287. [DOI: 10.1152/japplphysiol.00454.2017] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/16/2017] [Revised: 06/22/2017] [Accepted: 07/19/2017] [Indexed: 11/22/2022] Open
Abstract
In obesity, leptin receptors (OBR) and leptin signaling in skeletal muscle are downregulated. To determine whether OBR and leptin signaling are upregulated with a severe energy deficit, 15 overweight men were assessed before the intervention (PRE), after 4 days of caloric restriction (3.2 kcal·kg body wt−1·day−1) in combination with prolonged exercise (CRE; 8 h walking + 45 min single-arm cranking/day) to induce an energy deficit of ~5,500 kcal/day, and following 3 days of control diet (isoenergetic) and reduced exercise (CD). During CRE, the diet consisted solely of whey protein ( n = 8) or sucrose ( n = 7; 0.8 g·kg body wt−1·day−1). Muscle biopsies were obtained from the exercised and the nonexercised deltoid muscles and from the vastus lateralis. From PRE to CRE, serum glucose, insulin, and leptin were reduced. OBR expression was augmented in all examined muscles associated with increased maximal fat oxidation. Compared with PRE, after CD, phospho-Tyr1141OBR, phospho-Tyr985OBR, JAK2, and phospho-Tyr1007/1008JAK2 protein expression were increased in all muscles, whereas STAT3 and phospho-Tyr705STAT3 were increased only in the arms. The expression of protein tyrosine phosphatase 1B (PTP1B) in skeletal muscle was increased by 18 and 45% after CRE and CD, respectively ( P < 0.05). Suppressor of cytokine signaling 3 (SOCS3) tended to increase in the legs and decrease in the arm muscles (ANOVA interaction: P < 0.05). Myosin heavy chain I isoform was associated with OBR protein expression ( r = −0.75), phospho-Tyr985OBR ( r = 0.88), and phospho-Tyr705STAT3/STAT3 ( r = 0.74). In summary, despite increased PTP1B expression, skeletal muscle OBR and signaling are upregulated by a severe energy deficit with greater response in the arm than in the legs likely due to SOCS3 upregulation in the leg muscles. NEW & NOTEWORTHY This study shows that the skeletal muscle leptin receptors and their corresponding signaling cascade are upregulated in response to a severe energy deficit, contributing to increase maximal fat oxidation. The responses are more prominent in the arm muscles than in the legs but partly blunted by whey protein ingestion and high volume of exercise. This occurs despite an increase of protein tyrosine phosphatase 1B protein expression, a known inhibitor of insulin and leptin signaling.
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Affiliation(s)
- Ismael Perez-Suarez
- Department of Physical Education, University of Las Palmas de Gran Canaria, Las Palmas de Gran Canaria, Spain
- Research Institute of Biomedical and Health Sciences, Las Palmas de Gran Canaria, Spain; and
| | | | - Jaime de La Calle-Herrero
- Department of Physical Education, University of Las Palmas de Gran Canaria, Las Palmas de Gran Canaria, Spain
| | - Jose Losa-Reyna
- Department of Physical Education, University of Las Palmas de Gran Canaria, Las Palmas de Gran Canaria, Spain
| | - Marcos Martin-Rincon
- Department of Physical Education, University of Las Palmas de Gran Canaria, Las Palmas de Gran Canaria, Spain
- Research Institute of Biomedical and Health Sciences, Las Palmas de Gran Canaria, Spain; and
| | - David Morales-Alamo
- Department of Physical Education, University of Las Palmas de Gran Canaria, Las Palmas de Gran Canaria, Spain
- Research Institute of Biomedical and Health Sciences, Las Palmas de Gran Canaria, Spain; and
| | - Alfredo Santana
- Clinical Genetics Unit, Complejo Hospitalario Universitario Insular-Materno Infantil de Las Palmas de Gran Canaria, Las Palmas de Gran Canaria, Spain
- Research Institute of Biomedical and Health Sciences, Las Palmas de Gran Canaria, Spain; and
| | - Hans-Christer Holmberg
- Swedish Winter Sports Research Centre, Department of Health Sciences, Mid Sweden University, Östersund, Sweden
| | - Jose A. L. Calbet
- Department of Physical Education, University of Las Palmas de Gran Canaria, Las Palmas de Gran Canaria, Spain
- Research Institute of Biomedical and Health Sciences, Las Palmas de Gran Canaria, Spain; and
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Cellular and Molecular Mechanisms of Diabetic Atherosclerosis: Herbal Medicines as a Potential Therapeutic Approach. OXIDATIVE MEDICINE AND CELLULAR LONGEVITY 2017; 2017:9080869. [PMID: 28883907 PMCID: PMC5572632 DOI: 10.1155/2017/9080869] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 04/26/2017] [Revised: 06/30/2017] [Accepted: 07/10/2017] [Indexed: 01/09/2023]
Abstract
An increasing number of patients diagnosed with diabetes mellitus eventually develop severe coronary atherosclerosis disease. Both type 1 and type 2 diabetes mellitus increase the risk of cardiovascular disease associated with atherosclerosis. The cellular and molecular mechanisms affecting the incidence of diabetic atherosclerosis are still unclear, as are appropriate strategies for the prevention and treatment of diabetic atherosclerosis. In this review, we discuss progress in the study of herbs as potential therapeutic agents for diabetic atherosclerosis.
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Sun C, Shang J, Yao Y, Yin X, Liu M, Liu H, Zhou Y. O-GlcNAcylation: a bridge between glucose and cell differentiation. J Cell Mol Med 2016; 20:769-81. [PMID: 26929182 PMCID: PMC4831356 DOI: 10.1111/jcmm.12807] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/12/2015] [Accepted: 01/08/2016] [Indexed: 12/12/2022] Open
Abstract
Glucose is the major energy supply and a critical metabolite for most cells and is especially important when cell is differentiating. High or low concentrations of glucose enhances or inhibits the osteogenic, chondrogenic and adipogenic differentiation of cell via the insulin, transforming growth factor‐β and peroxisome proliferator‐activated receptor γ pathways, among others. New evidence implicates the hexosamine biosynthetic pathway as a mediator of crosstalk between glucose flux, cellular signalling and epigenetic regulation of cell differentiation. Extracellular glucose flux alters intracellular O‐GlcNAcylation levels through the hexosamine biosynthetic pathway. Signalling molecules that are important for cell differentiation, including protein kinase C, extracellular signal‐regulated kinase, Runx2, CCAAT/enhancer‐binding proteins, are modified by O‐GlcNAcylation. Thus, O‐GlcNAcylation markedly alters cell fate during differentiation via the post‐transcriptional modification of proteins. Furthermore, O‐GlcNAcylation and phosphorylation show complex interactions during cell differentiation: they can either non‐competitively occupy different sites on a substrate or competitively occupy a single site or proximal sites. Therefore, the influence of glucose on cell differentiation via O‐GlcNAcylation offers a potential target for controlling tissue homoeostasis and regeneration in ageing and disease. Here, we review recent progress establishing an emerging relationship among glucose concentration, O‐GlcNAcylation levels and cell differentiation.
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Affiliation(s)
- Chao Sun
- Department of Orthopedics, Xinqiao Hospital, Third Military Medical University, Chongqing, China
| | - Jin Shang
- Department of Orthopedics, Xinqiao Hospital, Third Military Medical University, Chongqing, China
| | - Yuan Yao
- Department of Orthopedics, Xinqiao Hospital, Third Military Medical University, Chongqing, China
| | - Xiaohong Yin
- Center for Evidence-based and Translational Medicine, Zhongnan Hospital, Wuhan University, Wuhan, China
| | - Minghan Liu
- Department of Orthopedics, Xinqiao Hospital, Third Military Medical University, Chongqing, China
| | - Huan Liu
- Department of Orthopedics, Xinqiao Hospital, Third Military Medical University, Chongqing, China
| | - Yue Zhou
- Department of Orthopedics, Xinqiao Hospital, Third Military Medical University, Chongqing, China
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Palacios-Ortega S, Varela-Guruceaga M, Martínez JA, de Miguel C, Milagro FI. Effects of high glucose on caveolin-1 and insulin signaling in 3T3-L1 adipocytes. Adipocyte 2016; 5:65-80. [PMID: 27144098 DOI: 10.1080/21623945.2015.1122856] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/16/2015] [Revised: 10/29/2015] [Accepted: 11/12/2015] [Indexed: 12/17/2022] Open
Abstract
Adipocytes exposed to high glucose concentrations exhibit impaired metabolic function, including an increase of oxidative and proinflammatory factors that might favor the development of insulin resistance. Caveolin-1 (Cav-1) is a key mediator of the insulin transduction pathway whose expression is significantly enhanced during adipocyte differentiation. In this work, we studied the effects of high glucose concentration on the regulation of Cav-1 expression and activation and its relation to the insulin signaling pathway during the adipogenic process and in long-term differentiated adipocytes. Both, long-term high glucose exposure during adipogenesis and short-term glucose incubation of mature adipocytes, promoted triglyceride accumulation in 3T3-L1 cells. The short-term exposure of mature adipocytes to high glucose significantly reduced the sensitivity to insulin of Cav-1, insulin receptor (IR) and potein kinase B (AKT-2) phosphorylation, as well as insulin-induced deoxyglucose uptake. Adipocytes differentiated in the presence of high glucose lost Cav-1 and IR response to insulin-stimulated phosphorylation, but maintained the insulin sensitivity of AKT-2 phosphorylation and deoxyglucose uptake. Although long-term high glucose exposure increased DNA methylation in Cav-1 promoter, Cav-1 expression was not affected. Moreover, these cells showed an increase of Cav-1, IR and AKT-2 protein content, pointing to an adaptive response induced by the long-term high glucose exposure.
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Chen GP, Zhang XQ, Wu T, Li L, Han J, Du CQ. Alteration of mevalonate pathway in proliferated vascular smooth muscle from diabetic mice: possible role in high-glucose-induced atherogenic process. J Diabetes Res 2015; 2015:379287. [PMID: 25918730 PMCID: PMC4396976 DOI: 10.1155/2015/379287] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/25/2015] [Revised: 03/17/2015] [Accepted: 03/17/2015] [Indexed: 12/18/2022] Open
Abstract
The proliferation of vascular smooth muscle cells (VSMCs) is one of the main features of atherosclerosis induced by high glucose. Mevalonate pathway is an important metabolic pathway that plays a key role in multiple cellular processes. The aim of this study was to define whether the enzyme expression in mevalonate pathway is changed in proliferated VSMCs during atherogenic process in diabetic mice. Diabetes was induced in BALB/c mice with streptozotocin (STZ, 50 mg/kg/day for 5 days). Induction of diabetes with STZ was associated with an increase of lesion area and media thickness after 8 and 16 weeks of diabetes. In aorta, there were overexpressions of some enzymes, including 3-hydroxy-3-methylglutaryl-coenzyme A reductase (HMGR), farnesyl pyrophosphate synthase (FPPS), geranylgeranyl pyrophosphate synthase (GGPPS), farnesyltransferase (FNT), and geranylgeranyltransferase-1 (GGT-1), and unchanged expression of squalene synthase (SQS) and phosphor-3-hydroxy-3-methylglutaryl-coenzyme A reductase (P-HMGR) in 8 and 16 weeks of diabetes. In vitro, VSMCs were cultured and treated with different glucose concentrations for 48 h. High glucose (22.2 mM) induced VSMC proliferation and upregulation of HMGR, FPPS, GGPPS, FNT, and GGT-1 but did not change the expressions of SQS and P-HMGR. In conclusion, altered expression of several key enzymes in the mevalonate pathway may play a potential pathophysiological role in atherogenic process of diabetes macrovascular complication.
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Affiliation(s)
- Guo-Ping Chen
- Department of Endocrinology, The First Affiliated Hospital, College of Medicine, Zhejiang University, Hangzhou 310003, China
- *Guo-Ping Chen:
| | - Xiao-Qin Zhang
- Department of Respirology, Zhejiang Provincial People's Hospital, Hangzhou 310014, China
| | - Tao Wu
- Institute of Cardiology, The First Affiliated Hospital, College of Medicine, Zhejiang University, Hangzhou 310003, China
| | - Liang Li
- Institute of Cardiology, The First Affiliated Hospital, College of Medicine, Zhejiang University, Hangzhou 310003, China
| | - Jie Han
- Institute of Cardiology, The First Affiliated Hospital, College of Medicine, Zhejiang University, Hangzhou 310003, China
| | - Chang-Qing Du
- Department of Cardiology, Zhejiang Hospital, Hangzhou 310003, China
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Rogers SC, Zhang X, Azhar G, Luo S, Wei JY. Exposure to high or low glucose levels accelerates the appearance of markers of endothelial cell senescence and induces dysregulation of nitric oxide synthase. J Gerontol A Biol Sci Med Sci 2013; 68:1469-81. [PMID: 23585419 DOI: 10.1093/gerona/glt033] [Citation(s) in RCA: 48] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023] Open
Abstract
To test the hypothesis that aging impairs endothelial cell response to glucose stress, we utilized a human umbilical vein endothelial cell in vitro model in which clinically relevant concentrations of normal (5.5 mM), high (25 mM), and low (1.5mM) glucose were tested. With advancing population doubling, exposure to normal glucose gradually decreased endothelial nitric oxide synthase expression and activity, resulting in slow, progressive development of markers of cell senescence (by population doubling level [PDL] 44). High or low glucose treatment accelerated the appearance of markers of senescence (by ~PDL 35) along with declines in endothelial nitric oxide synthase expression and activity. Human umbilical vein endothelial cells exposed to alternating low and high glucose gave even more rapid acceleration in the appearance of markers of senescence (by ~PDL 18) and reduction in endothelial nitric oxide synthase levels. Thus, exposure to low and high glucose induces earlier appearance of markers of endothelial cell senescence and dysregulation of the nitric oxide synthase gene and protein expression and function. These findings will help to elucidate endothelial dysfunction associated with glucose intolerance and improve future therapy for diabetic seniors.
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Affiliation(s)
- Steven C Rogers
- Reynolds Institute on Aging, University of Arkansas for Medical Sciences, 629 Jack Stephens Drive, Little Rock, AR 72205.
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Yang J, Han Y, Sun H, Chen C, He D, Guo J, Yu C, Jiang B, Zhou L, Zeng C. (-)-Epigallocatechin gallate suppresses proliferation of vascular smooth muscle cells induced by high glucose by inhibition of PKC and ERK1/2 signalings. JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY 2011; 59:11483-11490. [PMID: 21973165 DOI: 10.1021/jf2024819] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
Proliferation of vascular smooth muscle cells (VSMCs) plays an important role in the development and progression of diabetes-related vascular complications. (-)-Epigallocatechin gallate (EGCG), the major catechin derived from green tea, is able to exert antidiabetes effects in animal models. However, it is not known whether or not EGCG inhibits VSMC proliferation induced by high glucose. This study tested the hypothesis that EGCG might have an inhibitory effect on VSMC proliferation induced by high glucose. VSMC proliferation was determined by [(3)H]-thymidine incorporation and uptake of 3-(4,5-dimethylthiazol-2-yl)-diphenyltetrazolium bromide (MTT). Extracellular signal-regulated kinase (ERK) 1/2 phosphorylation was determined by immunoblotting, and ERK 1/2 activity was detected by measuring the ability to phosphorylate its substrate Elk-1. Glucose increased VSMC proliferation in a concentration-dependent manner, which was reduced in the presence of EGCG. VSMC proliferation mediated by high glucose (30 mM) was involved in protein kinase C (PKC) and ERK1/2 signalings, because its effect was blocked by PKC inhibitor (PKC inhibitor 19-31) and ERK1/2 inhibitor (PD98059). Pretreatment of VSMCs with EGCG significantly inhibited the stimulatory effect of high glucose on PKC and ERK1/2 activation, followed by attenuation of its downstream transcription factor Elk-1 phosphorylation. Taken together, these results suggest that EGCG could suppress VSMC proliferation induced by high glucose by inhibition of PKC and ERK1/2 signalings in VSMCs, which indicates that EGCG might be a possible medicine to reduce vascular complications in diabetes.
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Affiliation(s)
- Jian Yang
- Department of Nutrition, Daping Hospital, The Third Military Medical University, Chongqing, 400042 People's Republic of China
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Pandey V, Chaube B, Bhat MK. Hyperglycemia regulates MDR-1, drug accumulation and ROS levels causing increased toxicity of carboplatin and 5-fluorouracil in MCF-7 cells. J Cell Biochem 2011; 112:2942-52. [DOI: 10.1002/jcb.23210] [Citation(s) in RCA: 33] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
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Gur S, Kadowitz PJ, Hellstrom WJ. A Protein Tyrosine Kinase Inhibitor, Imatinib Mesylate (Gleevec), Improves Erectile and Vascular Function Secondary to a Reduction of Hyperglycemia in Diabetic Rats. J Sex Med 2010; 7:3341-50. [DOI: 10.1111/j.1743-6109.2010.01922.x] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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14
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Lessard L, Stuible M, Tremblay ML. The two faces of PTP1B in cancer. BIOCHIMICA ET BIOPHYSICA ACTA-PROTEINS AND PROTEOMICS 2009; 1804:613-9. [PMID: 19782770 DOI: 10.1016/j.bbapap.2009.09.018] [Citation(s) in RCA: 148] [Impact Index Per Article: 9.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/24/2009] [Revised: 09/11/2009] [Accepted: 09/18/2009] [Indexed: 10/25/2022]
Abstract
PTP1B is a classical non-transmembrane protein tyrosine phosphatase that plays a key role in metabolic signaling and is a promising drug target for type 2 diabetes and obesity. Accumulating evidence also indicates that PTP1B is involved in cancer, but contrasting findings suggest that it can exert both tumor suppressing and tumor promoting effects depending on the substrate involved and the cellular context. In this review, we will discuss the diverse mechanisms by which PTP1B may influence tumorigenesis as well as recent in vivo data on the impact of PTP1B deficiency in murine cancer models. Together, these results highlight not only the great potential of PTP1B inhibitors in cancer therapy but also the need for a better understanding of PTP1B function prior to use of these compounds in human patients.
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Affiliation(s)
- Laurent Lessard
- Goodman Cancer Centre and Department of Biochemistry, McGill University, 1160 Pine Avenue, Montréal, Québec, Canada H3G 0B1
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