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Al Kury LT, Sydorenko V, Smail MMA, Qureshi MA, Shmygol A, Papandreou D, Singh J, Howarth FC. Calcium signaling in endocardial and epicardial ventricular myocytes from streptozotocin-induced diabetic rats. J Diabetes Investig 2021; 12:493-500. [PMID: 33112506 PMCID: PMC8015823 DOI: 10.1111/jdi.13451] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/19/2020] [Revised: 10/08/2020] [Accepted: 10/22/2020] [Indexed: 12/16/2022] Open
Abstract
AIMS/INTRODUCTION Abnormalities in Ca2+ signaling have a key role in hemodynamic dysfunction in diabetic heart. The purpose of this study was to explore the effects of streptozotocin (STZ)-induced diabetes on Ca2+ signaling in epicardial (EPI) and endocardial (ENDO) cells of the left ventricle after 5-6 months of STZ injection. MATERIALS AND METHODS Whole-cell patch clamp was used to measure the L-type Ca2+ channel (LTCC) and Na+ /Ca2+ exchanger currents. Fluorescence photometry techniques were used to measure intracellular free Ca2+ concentration. RESULTS Although the LTCC current was not significantly altered, the amplitude of Ca2+ transients increased significantly in EPI-STZ and ENDO-STZ compared with controls. Time to peak LTCC current, time to peak Ca2+ transient, time to half decay of LTCC current and time to half decay of Ca2+ transients were not significantly changed in EPI-STZ and ENDO-STZ myocytes compared with controls. The Na+ /Ca2+ exchanger current was significantly smaller in EPI-STZ and in ENDO-STZ compared with controls. CONCLUSIONS STZ-induced diabetes resulted in an increase in amplitude of Ca2+ transients in EPI and ENDO myocytes that was independent of the LTCC current. Such an effect can be attributed, at least in part, to the dysfunction of the Na+ /Ca2+ exchanger. Additional studies are warranted to improve our understanding of the regional impact of diabetes on Ca2+ signaling, which will facilitate the discovery of new targeted treatments for diabetic cardiomyopathy.
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Affiliation(s)
- Lina T Al Kury
- Department of Health SciencesCollege of Natural and Health SciencesZayed UniversityAbu DhabiUnited Arab Emirates
| | - Vadym Sydorenko
- Department of Cellular MembranologyBogomoletz Institute of PhysiologyKievUkraine
| | - Manal MA Smail
- Department of PhysiologyCollege of Medicine and Health SciencesUAE UniversityAl AinUnited Arab Emirates
| | - Muhammad A Qureshi
- Department of PhysiologyCollege of Medicine and Health SciencesUAE UniversityAl AinUnited Arab Emirates
| | - Anatoly Shmygol
- Department of PhysiologyCollege of Medicine and Health SciencesUAE UniversityAl AinUnited Arab Emirates
| | - Dimitrios Papandreou
- Department of Health SciencesCollege of Natural and Health SciencesZayed UniversityAbu DhabiUnited Arab Emirates
| | - Jaipaul Singh
- School of Forensic and Applied SciencesUniversity of Central LancashirePrestonUK
| | - Frank Christopher Howarth
- Department of PhysiologyCollege of Medicine and Health SciencesUAE UniversityAl AinUnited Arab Emirates
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In Vitro Studies to Assess the α-Glucosidase Inhibitory Activity and Insulin Secretion Effect of Isorhamnetin 3-O-Glucoside and Quercetin 3-O-Glucoside Isolated from Salicornia herbacea. Processes (Basel) 2021. [DOI: 10.3390/pr9030483] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022] Open
Abstract
In this study, we examined the effect of ethanolic extract of Salicornia herbacea (ESH), isorhamnetin 3-O-glucoside (I3G), quercetin 3-O-glucoside (Q3G), quercetin, and isorhamnetin on α-glucosidase activity and glucose-stimulated insulin secretion (GSIS) in insulin-secreting rat insulinoma (INS-1) cells. A portion of the ethyl acetate fraction of ESH was chromatographed on a silica gel by a gradient elution with chloroform and methanol to provide Q3G and I3G. ESH, Q3G, and quercetin inhibited α-glucosidase activity, and quercetin (IC50 value was 29.47 ± 3.36 μM) inhibited the activity more effectively than Q3G. We further demonstrated that ESH, Q3G, quercetin, I3G, and isorhamnetin promote GSIS in INS-1 pancreatic β-cells without inducing cytotoxicity. Among them, I3G was the most effective in enhancing GSIS. I3G enhanced the phosphorylation of total extracellular signal-regulated kinase (ERK), insulin receptor substrate-2 (IRS-2), phosphatidylinositol 3-kinase (PI3K), Akt, and activated pancreatic and duodenal homeobox-1 (PDX-1), which are associated with insulin secretion and β-cell function. As components of ESH, Q3G has the potential to regulate blood glucose by inhibiting α-glucosidase activity, and I3G enhances the insulin secretion, but its bioavailability should be considered in determining biological importance.
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Shang A, Liu HY, Luo M, Xia Y, Yang X, Li HY, Wu DT, Sun Q, Geng F, Li HB, Gan RY. Sweet tea (Lithocarpus polystachyus rehd.) as a new natural source of bioactive dihydrochalcones with multiple health benefits. Crit Rev Food Sci Nutr 2020; 62:917-934. [DOI: 10.1080/10408398.2020.1830363] [Citation(s) in RCA: 30] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Affiliation(s)
- Ao Shang
- National Agricultural Science & Technology Center, Chengdu, China
- Institute of Urban Agriculture, Chinese Academy of Agricultural Sciences, Chengdu, China
- Guangdong Provincial Key Laboratory of Food, Nutrition and Health, Department of Nutrition, School of Public Health, Sun Yat-Sen University, Guangzhou, China
| | - Hong-Yan Liu
- National Agricultural Science & Technology Center, Chengdu, China
- Institute of Urban Agriculture, Chinese Academy of Agricultural Sciences, Chengdu, China
| | - Min Luo
- Guangdong Provincial Key Laboratory of Food, Nutrition and Health, Department of Nutrition, School of Public Health, Sun Yat-Sen University, Guangzhou, China
| | - Yu Xia
- National Agricultural Science & Technology Center, Chengdu, China
- Institute of Urban Agriculture, Chinese Academy of Agricultural Sciences, Chengdu, China
| | - Xiao Yang
- National Agricultural Science & Technology Center, Chengdu, China
- Institute of Urban Agriculture, Chinese Academy of Agricultural Sciences, Chengdu, China
| | - Hang-Yu Li
- Guangdong Provincial Key Laboratory of Food, Nutrition and Health, Department of Nutrition, School of Public Health, Sun Yat-Sen University, Guangzhou, China
| | - Ding-Tao Wu
- Institute of Food Processing and Safety, College of Food Science, Sichuan Agricultural University, Ya’an, Sichuan, China
| | - Quancai Sun
- School of Food and Biological Engineering, Jiangsu University, Zhenjiang, China
| | - Fang Geng
- Key Laboratory of Coarse Cereal Processing (Ministry of Agriculture and Rural Affairs), School of Food and Biological Engineering, Chengdu University, Chengdu, China
| | - Hua-Bin Li
- Guangdong Provincial Key Laboratory of Food, Nutrition and Health, Department of Nutrition, School of Public Health, Sun Yat-Sen University, Guangzhou, China
| | - Ren-You Gan
- National Agricultural Science & Technology Center, Chengdu, China
- Institute of Urban Agriculture, Chinese Academy of Agricultural Sciences, Chengdu, China
- Key Laboratory of Coarse Cereal Processing (Ministry of Agriculture and Rural Affairs), School of Food and Biological Engineering, Chengdu University, Chengdu, China
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