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Fayazi F, Kheirouri S, Alizadeh M. Exploring effects of melatonin supplementation on insulin resistance: An updated systematic review of animal and human studies. Diabetes Metab Syndr 2024; 18:103073. [PMID: 39096757 DOI: 10.1016/j.dsx.2024.103073] [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: 04/07/2023] [Revised: 07/01/2024] [Accepted: 07/10/2024] [Indexed: 08/05/2024]
Abstract
BACKGROUND Insulin resistance (IR), defined as an impaired response to insulin stimulation of target tissues, is a substantial determinant of many metabolic disorders. This study aimed to update the findings of the previous systematic review evidence regarding the effect of melatonin on factors related to IR, including hyperinsulinemia, hyperglycemia, homeostasis model assessment of insulin resistance (HOMA-IR), and quantitative insulin sensitivity check index (QUICKI). METHODS We systematically reviewed the evidence on the impact of melatonin supplementation on IR indices, fasting insulin, and fasting plasma glucose. PubMed, ScienceDirect, SCOPUS, and Google Scholar databases were searched until March 2024. RESULTS We identified 6114 potentially relevant articles during the search. Eighteen animal studies and 15 randomized clinical trials met the inclusion criteria. The results indicated that melatonin supplementation reduced fasting plasma glucose (FPG, 14 out of 29 studies), fasting insulin (22 out of 28 studies), HOMA-IR (28 out of 33 studies), and increased QUICKI (7 out of 7 studies). According to RCT studies, melatonin treatment at a dosage of 10 mg reduced HOMA-IR levels in individuals with various health conditions. CONCLUSION According to most evidence, melatonin supplementation may decrease fasting insulin and HOMA-IR and increase QUICKI but may not affect FPG.
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Affiliation(s)
- Fakhrosadat Fayazi
- Student Research Center, Tabriz University of Medical Sciences, Tabriz, Iran.
| | - Sorayya Kheirouri
- Department of Nutrition, Faculty of Nutrition and Food Sciences, Tabriz University of Medical Sciences, Tabriz, Iran.
| | - Mohammad Alizadeh
- Department of Nutrition, Faculty of Nutrition and Food Sciences, Tabriz University of Medical Sciences, Tabriz, Iran; Nutrition Research Center, Tabriz University of Medical Sciences, Tabriz, Iran.
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2
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Silva AAD, Pérez EMDS, Figueiredo ISTD, Alencar NMND, Alves APNN, Fernandes FAN, Vasconcelos RP, Oliveira ACD, Gaban SVF. Effect of virgin coconut oil on body weight, white fat depots, and biochemical and morphological parameters in mice fed standard or high-fat diets. Food Funct 2023; 14:6853-6863. [PMID: 37417892 DOI: 10.1039/d3fo01447a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 07/08/2023]
Abstract
This study investigated the effects of virgin coconut oil (VCO) on body weight, white fat depots, and biochemical and morphological parameters in male Swiss mice fed standard (SD) or high-fat (HFD) diets. Thirty-three adult animals were assigned to one of four groups, as follows: SD, SD plus VCO (SDCO), HFD, and HFD plus VCO (HFDCO). VCO had no effects on the Lee index, subcutaneous fat, periepididymal fat, retroperitoneal fat, area under the curve for glucose, or pancreas weight, all of which were increased by HFD. Low-density lipoprotein cholesterol increased in the SDCO group compared with the SD group and decreased in the HFDCO group compared with the HFD group. VCO increased total cholesterol only in the SDCO group compared with the SD group, with no differences between the HFD and HFDCO groups. In conclusion, low-dose VCO supplementation did not improve obesity, had no effects on hepatic or renal function, and had beneficial effects on the lipid profile only in animals fed HFD.
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3
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Maity J, Dey T, Banerjee A, Chattopadhyay A, Das AR, Bandyopadhyay D. Melatonin ameliorates myocardial infarction in obese diabetic individuals: The possible involvement of macrophage apoptotic factors. J Pineal Res 2023; 74:e12847. [PMID: 36456538 DOI: 10.1111/jpi.12847] [Citation(s) in RCA: 2] [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: 08/22/2022] [Revised: 10/14/2022] [Accepted: 11/28/2022] [Indexed: 12/05/2022]
Abstract
In recent days, the hike in obesity-mediated epidemics across the globe and the prevalence of obesity-induced cardiovascular disease has become one of the chief grounds for morbidity and mortality. This epidemic-driven detrimental events in the cardiac tissues start with the altered distribution and metabolism pattern of high-density lipoprotein and low-density lipoprotein (LDL) leading to cholesterol (oxidized LDL) deposition on the arterial wall and atherosclerotic plaque generation, followed by vascular spasms and infarction. Subsequently, obesity-triggered metabolic malfunctions induce free radical generation which may further trigger pro-inflammatory signaling and nuclear factor kappa-light-chain-enhancer of activated B cells transcriptional factor, thus inducing interferon-gamma, tumor necrosis factor-alpha, and inducible nitric oxide synthase. This terrifying cardiomyopathy can be further aggravated in type 2 diabetes mellitus, thereby making obese diabetic patients prone toward the development of myocardial infarction (MI) or stroke in comparison to their nondiabetic counterparts. The accelerated oxidative stress and pro-inflammatory response induced cardiomyocyte hypertrophy, followed by apoptosis in obese diabetic individuals, causing progression of athero-thrombotic vascular disease. Being an efficient antioxidative and anti-inflammatory indolamine, melatonin effectively inhibits lipid peroxidation, pro-inflammatory reactions, thereby resolving free radical-induced myocardial damages along with maintaining antioxidant reservoir to preserve cardiovascular integrity. Prolonged melatonin treatment maintains balanced body weight and serum total cholesterol concentration by inhibiting cholesterol synthesis and promoting cholesterol catabolism. Additionally, melatonin promotes macrophage polarization toward the anti-inflammatory state, providing a proper shield during the recovery period. Therefore, the protective role of melatonin in maintaining the lipid metabolism homeostasis and blocking the atherosclerotic plaque rupture could be targeted as the possible therapeutic strategy for the management of obesity-induced acute MI. This review aimed at orchestrating the efficacy of melatonin in ameliorating irrevocable oxidative cardiovascular damage induced by the obesity-diabetes correlation.
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Affiliation(s)
- Juin Maity
- Oxidative Stress and Free Radical Biology Laboratory, Department of Physiology, University of Calcutta, Kolkata, India
| | - Tiyasa Dey
- Oxidative Stress and Free Radical Biology Laboratory, Department of Physiology, University of Calcutta, Kolkata, India
| | - Adrita Banerjee
- Oxidative Stress and Free Radical Biology Laboratory, Department of Physiology, University of Calcutta, Kolkata, India
| | | | - Asish R Das
- Department of Chemistry, University of Calcutta, Kolkata, India
| | - Debasish Bandyopadhyay
- Oxidative Stress and Free Radical Biology Laboratory, Department of Physiology, University of Calcutta, Kolkata, India
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4
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Miola A, Fornaro M, Sambataro F, Solmi M. Melatonin and melatonin-agonists for metabolic syndrome components in patients treated with antipsychotics: A systematic review and meta-analysis. Hum Psychopharmacol 2022; 37:e2821. [PMID: 34687076 DOI: 10.1002/hup.2821] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/06/2021] [Revised: 09/27/2021] [Accepted: 09/28/2021] [Indexed: 11/07/2022]
Abstract
OBJECTIVE Metabolic side effects are a limiting factor in the use of antipsychotics, which remain the cornerstone of long-term management of patients with severe mental illness. There is contrasting evidence on a possible role of melatonin and melatonin-agonists in attenuating antipsychotic-induced metabolic abnormalities. DESIGN We conducted a systematic review (PubMed, PsycInfo, Cochrane databases, up to August 2020) and a random-effect meta-analysis of double-blind, randomized placebo-controlled trials (RCTs) involving melatonin and melatonin-agonists in the treatment of antipsychotic-induced metabolic changes. The primary outcome was the standardized mean difference (SMD) of composite metabolic outcomes built with metabolic syndrome components. Secondary outcomes were individual metabolic syndrome components, and other anthropometric, glucose metabolism, lipid profile, and psychopathology measures. RESULTS Out of the initial 41 studies, six documented five separate RCTs randomizing 248 patients (126 to melatonin/ramelteon, 122 to placebo) affected by schizophrenia-spectrum disorders and bipolar disorder. Melatonin/ramelteon outperformed placebo on the primary outcome (SMD -0.28, 95% CI = -0.39 ÷ -0.168), as well as on all individual components of metabolic syndrome (systolic blood pressure MD -3.266, 95% CI = -6.020 ÷ -0.511; fasting glucose MD -3.766, 95% CI = -5.938 ÷ -1.593; triglycerides MD -9.800, 95% CI = -19.431 ÷ -0.169; HDL MD 2.995, 95% CI = 0.567 ÷ 5.423), except waist circumference. CONCLUSIONS Melatonin/ramelteon augmentation may be beneficial for non-anthropometric metabolic syndrome components in patients treated with antipsychotics.
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Affiliation(s)
- Alessandro Miola
- Department of Neuroscience, University of Padova, Padua, Italy.,Padua Neuroscience Center, University of Padova, Padua, Italy
| | - Michele Fornaro
- Section of Psychiatry, Department of Neuroscience, Reproductive Sciences and Dentistry, Federico II University, Naples, Italy
| | - Fabio Sambataro
- Department of Neuroscience, University of Padova, Padua, Italy.,Padua Neuroscience Center, University of Padova, Padua, Italy
| | - Marco Solmi
- Department of Psychiatry, University of Ottawa, Ottawa, Ontario, Canada.,Department of Mental Health, The Ottawa Hospital, Ottawa, Ontario, Canada.,Clinical Epidemiology Program, Ottawa Hospital Research Institute (OHRI), University of Ottawa, Ottawa, Ontario, Canada
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5
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Patel R, Parmar N, Pramanik Palit S, Rathwa N, Ramachandran AV, Begum R. Diabetes mellitus and melatonin: Where are we? Biochimie 2022; 202:2-14. [PMID: 35007648 DOI: 10.1016/j.biochi.2022.01.001] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/19/2021] [Revised: 12/07/2021] [Accepted: 01/04/2022] [Indexed: 12/24/2022]
Abstract
Diabetes mellitus (DM) and diabetes-related complications are amongst the leading causes of mortality worldwide. The international diabetes federation (IDF) has estimated 592 million people to suffer from DM by 2035. Hence, finding a novel biomolecule that can effectively aid diabetes management is vital, as other existing drugs have numerous side effects. Melatonin, a pineal hormone having antioxidative and anti-inflammatory properties, has been implicated in circadian dysrhythmia-linked DM. Reduced levels of melatonin and a functional link between melatonin and insulin are implicated in the pathogenesis of type 2 diabetes (T2D) Additionally, genomic studies revealed that rare variants in melatonin receptor 1b (MTNR1B) are also associated with impaired glucose tolerance and increased risk of T2D. Moreover, exogenous melatonin treatment in cell lines, rodent models, and diabetic patients has shown a potent effect in alleviating diabetes and other related complications. This highlights the role of melatonin in glucose homeostasis. However, there are also contradictory reports on the effects of melatonin supplementation. Thus, it is essential to explore if melatonin can be taken from bench to bedside for diabetes management. This review summarizes the therapeutic potential of melatonin in various diabetic models and whether it can be considered a safe drug for managing diabetic complications and diabetic manifestations like oxidative stress, inflammation, ER stress, mitochondrial dysfunction, metabolic dysregulation, etc.
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Affiliation(s)
- Roma Patel
- Department of Biochemistry, Faculty of Science, The Maharaja Sayajirao University of Baroda, Vadodara, 390 002, Gujarat, India
| | - Nishant Parmar
- Department of Biochemistry, Faculty of Science, The Maharaja Sayajirao University of Baroda, Vadodara, 390 002, Gujarat, India
| | - Sayantani Pramanik Palit
- Department of Biochemistry, Faculty of Science, The Maharaja Sayajirao University of Baroda, Vadodara, 390 002, Gujarat, India
| | - Nirali Rathwa
- Department of Biochemistry, Faculty of Science, The Maharaja Sayajirao University of Baroda, Vadodara, 390 002, Gujarat, India
| | - A V Ramachandran
- Division of Life Science, School of Sciences, Navrachana University, Vadodara, 391 410, Gujarat, India
| | - Rasheedunnisa Begum
- Department of Biochemistry, Faculty of Science, The Maharaja Sayajirao University of Baroda, Vadodara, 390 002, Gujarat, India.
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6
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Mechanisms of Melatonin in Obesity: A Review. Int J Mol Sci 2021; 23:ijms23010218. [PMID: 35008644 PMCID: PMC8745381 DOI: 10.3390/ijms23010218] [Citation(s) in RCA: 47] [Impact Index Per Article: 15.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/27/2021] [Revised: 12/20/2021] [Accepted: 12/22/2021] [Indexed: 12/11/2022] Open
Abstract
Obesity and its complications have become a prominent global public health problem that severely threatens human health. Melatonin, originally known as an effective antioxidant, is an endogenous hormone found throughout the body that serves various physiological functions. In recent decades, increasing attention has been paid to its unique function in regulating energy metabolism, especially in glucose and lipid metabolism. Accumulating evidence has established the relationship between melatonin and obesity; nevertheless, not all preclinical and clinical evidence indicates the anti-obesity effect of melatonin, which makes it remain to conclude the clinical effect of melatonin in the fight against obesity. In this review, we have summarized the current knowledge of melatonin in regulating obesity-related symptoms, with emphasis on its underlying mechanisms. The role of melatonin in regulating the lipid profile, adipose tissue, oxidative stress, and inflammation, as well as the interactions of melatonin with the circadian rhythm, gut microbiota, sleep disorder, as well as the α7nAChR, the opioidergic system, and exosomes, make melatonin a promising agent to open new avenues in the intervention of obesity.
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Tur DA, Khotskin NV, Akulov AE. Sex difference feeding behaviour of NOD SCID mice in a pharmacological model of type 1 diabetes. J Anim Physiol Anim Nutr (Berl) 2021; 105:984-988. [PMID: 33655640 DOI: 10.1111/jpn.13517] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/02/2020] [Revised: 11/01/2020] [Accepted: 11/28/2020] [Indexed: 11/29/2022]
Abstract
This study aimed to assess the sex differences in the feeding behaviour of non-obese diabetic severe combined immunodeficient (NOD SCID) mice in a pharmacological model of type 1 diabetes mellitus (T1Dm). In our study, we chose NOD SCID mice of both sexes and assessed their feeding behaviour, body weight, body fat and water content under identical experimental conditions and diets. After 1 month of diabetes mellitus in mice in the experimental group, males and females did not show any increase in body weight, and they weighed significantly less than the control group. However, compared with the control group, in females with a background of T1Dm, there was a significant decrease in body fat. The amount of water consumed in the experimental groups was higher than that in the control groups. The amount of food consumed by males increased when they increased their water consumption, whereas food consumption in females decreased significantly with an increase in water consumption. Thus, we discovered sex differences in the feeding behaviour, body weight and body fat and water content in the pharmacological model of T1Dm after 1 month in NOD SCID mice.
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Affiliation(s)
- Daria A Tur
- The Federal Research Center Institute of Cytology and Genetics, SB RAS, Novosibirsk, Russia
| | - Nikita V Khotskin
- The Federal Research Center Institute of Cytology and Genetics, SB RAS, Novosibirsk, Russia
| | - Andrey E Akulov
- The Federal Research Center Institute of Cytology and Genetics, SB RAS, Novosibirsk, Russia
- Novosibirsk State University, Novosibirsk, Russia
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Tavares BS, Tsosura TVS, Mattera MSLC, Santelli JO, Belardi BE, Chiba FY, Cintra LTA, Silva CC, Matsushita DH. Effects of melatonin on insulin signaling and inflammatory pathways of rats with apical periodontitis. Int Endod J 2021; 54:926-940. [PMID: 33411973 DOI: 10.1111/iej.13474] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/21/2020] [Revised: 01/04/2021] [Accepted: 01/05/2021] [Indexed: 12/15/2022]
Abstract
AIM To verify the effects of melatonin supplementation on insulin sensitivity, plasma concentrations of inflammatory cytokines, insulin signalling and inflammatory pathways in the soleus (SM) and extensor digitorum longus (EDL) muscles of rats with apical periodontitis (AP). METHODOLOGY Seventy-two Wistar rats were distributed into 4 groups: (a) control (C), (b) control supplemented with melatonin (M), (c) AP (AP), and (d) AP supplemented with melatonin (AP + M). AP was induced by pulp exposure of the maxillary and mandibular right first and second molars to the oral environment. After AP induction, oral supplementation with 5 mg kg-1 melatonin (diluted in drinking water) for 60 days was initiated. At the end of the treatment, the following were analysed: (1) plasma concentrations of insulin and inflammatory cytokines (TNF-α, IL-6, IL-1β and IL-10) using ELISA kits; (2) glycaemia using enzymatic assay; (3) insulin resistance using homoeostasis model assessment of insulin resistance (HOMA-IR) index; and (4) phosphorylation status of pp185 tyrosine, Akt serine, IKKα/β, and JNK in SM and EDL using Western blot. Analysis of variance of two or three factors was performed, followed by the Bonferroni test. P values < 0.05 were considered statistically significant. RESULTS AP promoted insulin resistance, significantly increased (P < 0.05) plasma concentrations of pro-inflammatory cytokines (TNF-α, IL-6, and IL-1β), significantly decreased (P < 0.05) the concentration of anti-inflammatory cytokine IL-10, impaired insulin signalling in SM, and increased IKKα/β phosphorylation status in SM and EDL. Melatonin supplementation in rats with AP improved insulin sensitivity, significantly decreased (P < 0.05) TNF-α and IL-1β, significantly increased (P < 0.05) IL-10 plasma concentrations, and changed the insulin signalling in soleus muscle and IKKα/β phosphorylation status in SM and EDL muscles. CONCLUSIONS Melatonin is a potent adjuvant treatment for improving apical periodontitis-associated changes in insulin sensitivity, insulin signalling and inflammatory pathways. In addition, the negative impact of AP on general health was also demonstrated.
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Affiliation(s)
- B S Tavares
- Programa de Pós-graduação Multicêntrico em Ciências Fisiológicas, PPGMCF, SBFis, Department of Basic Sciences, School of Dentistry, São Paulo State University (UNESP), Araçatuba, Brazil
| | - T V S Tsosura
- Programa de Pós-graduação Multicêntrico em Ciências Fisiológicas, PPGMCF, SBFis, Department of Basic Sciences, School of Dentistry, São Paulo State University (UNESP), Araçatuba, Brazil
| | - M S L C Mattera
- Programa de Pós-graduação Multicêntrico em Ciências Fisiológicas, PPGMCF, SBFis, Department of Basic Sciences, School of Dentistry, São Paulo State University (UNESP), Araçatuba, Brazil
| | - J O Santelli
- Programa de Pós-graduação Multicêntrico em Ciências Fisiológicas, PPGMCF, SBFis, Department of Basic Sciences, School of Dentistry, São Paulo State University (UNESP), Araçatuba, Brazil
| | - B E Belardi
- Programa de Pós-graduação Multicêntrico em Ciências Fisiológicas, PPGMCF, SBFis, Department of Basic Sciences, School of Dentistry, São Paulo State University (UNESP), Araçatuba, Brazil
| | - F Y Chiba
- Department of Preventive and Restorative Dentistry, School of Dentistry, São Paulo State University (UNESP), Araçatuba, Brazil
| | - L T A Cintra
- Department of Preventive and Restorative Dentistry, School of Dentistry, São Paulo State University (UNESP), Araçatuba, Brazil
| | - C C Silva
- Department of Preventive and Restorative Dentistry, School of Dentistry, São Paulo State University (UNESP), Araçatuba, Brazil
| | - D H Matsushita
- Programa de Pós-graduação Multicêntrico em Ciências Fisiológicas, PPGMCF, SBFis, Department of Basic Sciences, School of Dentistry, São Paulo State University (UNESP), Araçatuba, Brazil
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9
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Bai Y, Tang L, Li L, Li L. The roles of ADIPOQ rs266729 and MTNR1B rs10830963 polymorphisms in patients with gestational diabetes mellitus: A meta-analysis. Gene 2020; 730:144302. [DOI: 10.1016/j.gene.2019.144302] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/10/2019] [Revised: 12/18/2019] [Accepted: 12/18/2019] [Indexed: 12/27/2022]
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10
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Khorsand M, Akmali M, Akhzari M. Efficacy of melatonin in restoring the antioxidant status in the lens of diabetic rats induced by streptozotocin. J Diabetes Metab Disord 2019; 18:543-549. [PMID: 31890680 DOI: 10.1007/s40200-019-00445-8] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/08/2018] [Accepted: 09/23/2019] [Indexed: 02/07/2023]
Abstract
Background Melatonin is a well-known free radical scavenger. The present study aimed to investigate the effects of melatonin treatment on the antioxidant status in the lenticular tissue of streptozotocin (STZ)-induced diabetic rats. Methods Thirty-four male rats were randomly divided into four groups as follows: healthy control rats (group 1, n = 10); diabetic control rats (group 2, n = 10); melatonin-treated (5 mg/kg·day) diabetic rats (group 3, n = 10) and melatonin-treated (5 mg/kg·day) healthy rats (group 4, n = 4). Diabetes was induced by injection of streptozotocin (50 mg/kg, ip). Following 8-weeks of melatonin treatment, all rats were killed and the blood plasma and their lenses were stored at -70 °C for antioxidant enzyme activities assay and biochemical determination. Results The plasma glucose and lens malondialdehyde (MDA) increased significantly in the rats of group 2 as compared to the group 1. Also, a significant decrease in the levels of catalase (CAT) and glutathione reductase (GR) activities in the lenses and plasma reduced glutathione (GSH) was found. However, the levels of lenticular MDA (not significant) and the plasma glucose significantly decreased in the rats of group 3 compared to the group 2. Besides, the levels of CAT, GR in the rats lens and plasma GSH increased significantly. Conclusion Diabetes mellitus induced hyperglycemia and oxidative stress, whereas melatonin decreased the blood glucose levels and lipid peroxidation and increased the activities of antioxidant enzymes in diabetic rat lenses.
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Affiliation(s)
- Marjan Khorsand
- 1Department of Biochemistry and Molecular Biology, Shahid Sadoughi University of Medical Sciences, Fars-shiraz-meshkinfam St.-paramedical school-Department of laboratory sciences, Yazd, Iran
- 2Department of Biochemistry, Shiraz University of Medical Sciences, Medical School, P.O box: 71345 1167, Shiraz, Iran
| | - Masoumeh Akmali
- 2Department of Biochemistry, Shiraz University of Medical Sciences, Medical School, P.O box: 71345 1167, Shiraz, Iran
| | - Morteza Akhzari
- 2Department of Biochemistry, Shiraz University of Medical Sciences, Medical School, P.O box: 71345 1167, Shiraz, Iran
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Mok JX, Ooi JH, Ng KY, Koh RY, Chye SM. A new prospective on the role of melatonin in diabetes and its complications. Horm Mol Biol Clin Investig 2019; 40:/j/hmbci.ahead-of-print/hmbci-2019-0036/hmbci-2019-0036.xml. [PMID: 31693492 DOI: 10.1515/hmbci-2019-0036] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/27/2019] [Accepted: 10/01/2019] [Indexed: 01/01/2023]
Abstract
Melatonin is a hormone secreted by the pineal gland under the control of the circadian rhythm, and is released in the dark and suppressed during the day. In the past decades, melatonin has been considered to be used in the treatment for diabetes mellitus (DM). This is due to a functional inter-relationship between melatonin and insulin. Elevated oxidative stress is a feature found in DM associated with diabetic neuropathy (DN), retinopathy (DR), nephropathy and cardiovascular disease. Reactive oxygen species (ROS) and nitrogen oxidative species (NOS) are usually produced in massive amounts via glucose and lipid peroxidation, and this leads to diabetic complications. At the molecular level, ROS causes damage to the biomolecules and triggers apoptosis. Melatonin, as an antioxidant and a free radical scavenger, ameliorates oxidative stress caused by ROS and NOS. Besides that, melatonin administration is proven to bring other anti-DM effects such as reducing cellular apoptosis and promoting the production of antioxidants.
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Affiliation(s)
- Jia Xin Mok
- School of Medical Laboratory Science, University of Otago, Dunedin 9054, New Zealand.,University of Otago, Dunedin School of Medicine, Department of Pathology, Medical Laboratory Science, Dunedin 9016, New Zealand
| | - Jack Hau Ooi
- International Medical University, School of Health Science, Kuala Lumpur 57000, Malaysia
| | - Khuen Yen Ng
- Monash University Malaysia, School of Pharmacy, Selangor 47500, Malaysia
| | - Rhun Yian Koh
- International Medical University, School of Health Science, Kuala Lumpur 57000, Malaysia
| | - Soi Moi Chye
- International Medical University, School of Health Science, Kuala Lumpur 57000, Malaysia.,School of Health Science, Division of Biomedical Science and Biotechnology, International Medical University, No. 126, Jalan Jalil Perkasa 19, Bukit Jalil, 57000 Kuala Lumpur, Malaysia, Phone: +60-3-27317220, Fax: +06-3-86567229
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12
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D Avila LSP, de Oliveira KA, de Abreu ES, Vasconcelos RP, Nascimento JDF, Bezerra Pontes EO, Rickli S, Coelho de Souza AN, Leal Cardoso JH, Silveira LR, Carneiro EM, de Carvalho DP, Torres Leal FL, de Oliveira AC. Hypoglycaemic effect of resveratrol in streptozotocin-induced diabetic rats is impaired when supplemented in association with leucine. Int J Food Sci Nutr 2019; 71:529-539. [PMID: 31694434 DOI: 10.1080/09637486.2019.1687660] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
Abstract
Studies have shown synergistic and independent effects of leucine and resveratrol (RSV) as possible therapeutic agents to ameliorate metabolic disorders. Thus, the objective of this study was to investigate the effects of supplementation with leucine and RSV, alone and in combination, on metabolic changes in white adipose tissue of neonatally STZ-induced diabetic rats. After weaning, the rats were treated with trans-resveratrol (0.6 mg/kg/dose) and/or leucine (1.35 mg/kg/dose) administered orally. The animals were euthanized at age 16 weeks for blood analyses. Subcutaneous (SC), periepididymal (PE) and retroperitoneal (RP) fat pads were weighed. Adipocytes from PE and RP pads were isolated for morphometric analysis. Long-term supplementation with RSV promoted adiposity recovery, prevented hypoinsulinemia and improved the metabolic profile of the diabetic rats. However, some of these effects were impaired when RSV was associated with leucine. The diabetic rats supplemented with leucine alone showed no significant improvement in metabolic disorders.
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Affiliation(s)
| | | | - Ewerton Sousa de Abreu
- Superior Institute of Biomedical Sciences, State University of Ceará, Fortaleza, CE, Brazil
| | | | | | | | - Sarah Rickli
- Research Center on Obesity and Comorbidities, Campinas, SP, Brazil
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13
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Farias TDSMD, Paixao RID, Cruz MM, de Sa RDCDC, Simão JDJ, Antraco VJ, Alonso-Vale MIC. Melatonin Supplementation Attenuates the Pro-Inflammatory Adipokines Expression in Visceral Fat from Obese Mice Induced by A High-Fat Diet. Cells 2019; 8:E1041. [PMID: 31489938 PMCID: PMC6770101 DOI: 10.3390/cells8091041] [Citation(s) in RCA: 24] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/13/2019] [Revised: 09/04/2019] [Accepted: 09/05/2019] [Indexed: 12/16/2022] Open
Abstract
Obesity is defined as a condition of abnormal or excessive fat accumulation in white adipose tissue that results from the exacerbated consumption of calories associated with low energy expenditure. Fat accumulation in both adipose tissue and other organs contributes to a systemic inflammation leading to the development of metabolic disorders such as type 2 diabetes, hypertension, and dyslipidemia. Melatonin is a potent antioxidant and improves inflammatory processes and energy metabolism. Using male mice fed a high-fat diet (HFD-59% fat from lard and soybean oil; 9:1) as an obesity model, we investigated the effects of melatonin supplementation on the prevention of obesity-associated complications through an analysis of plasma biochemical profile, body and fat depots mass, adipocytes size and inflammatory cytokines expression in epididymal (EPI) adipose depot. Melatonin prevented a gain of body weight and fat depot mass as well as adipocyte hypertrophy. Melatonin also reversed the increase of total cholesterol, triglycerides and LDL-cholesterol. In addition, this neurohormone was effective in completely decreasing the inflammatory cytokines leptin and resistin in plasma. In the EPI depot, melatonin reversed the increase of leptin, Il-6, Mcp-1 and Tnf-α triggered by obesity. These data allow us to infer that melatonin presents an anti-obesity effect since it acts to prevent the progression of pro-inflammatory markers in the epididymal adipose tissue together with a reduction in adiposity.
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Affiliation(s)
- Talita da Silva Mendes de Farias
- Department of Biological Sciences, Institute of Environmental Sciences, Chemical and Pharmaceutical, Federal University of Sao Paulo, Diadema 09913-130, Brazil.
| | - Regislane Ino da Paixao
- Department of Biological Sciences, Institute of Environmental Sciences, Chemical and Pharmaceutical, Federal University of Sao Paulo, Diadema 09913-130, Brazil.
| | - Maysa Mariana Cruz
- Department of Biological Sciences, Institute of Environmental Sciences, Chemical and Pharmaceutical, Federal University of Sao Paulo, Diadema 09913-130, Brazil.
| | | | - Jussara de Jesus Simão
- Department of Biological Sciences, Institute of Environmental Sciences, Chemical and Pharmaceutical, Federal University of Sao Paulo, Diadema 09913-130, Brazil.
| | - Vitor Jaco Antraco
- Department of Biological Sciences, Institute of Environmental Sciences, Chemical and Pharmaceutical, Federal University of Sao Paulo, Diadema 09913-130, Brazil.
| | - Maria Isabel Cardoso Alonso-Vale
- Department of Biological Sciences, Institute of Environmental Sciences, Chemical and Pharmaceutical, Federal University of Sao Paulo, Diadema 09913-130, Brazil.
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Yan H, Meng J, Zhang S, Zhuang H, Song Y, Xiao X, Wang DW, Jiang J. Pretreatment of rAAV-Mediated Expression of Myostatin Propeptide Lowers Type 2 Diabetes Incidence inC57BL/6Mice on a High-Fat Diet. Hum Gene Ther 2019; 30:661-671. [DOI: 10.1089/hum.2018.140] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Affiliation(s)
- Hui Yan
- Division of Cardiology, Department of Internal Medicine, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Hubei Key Laboratory of Genetics and Molecular Mechanisms of Cardiological Disorders (Huazhong University of Science and Technology), Wuhan, P.R. China
| | - Jiejie Meng
- Division of Cardiology, Department of Internal Medicine, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Hubei Key Laboratory of Genetics and Molecular Mechanisms of Cardiological Disorders (Huazhong University of Science and Technology), Wuhan, P.R. China
| | - Shasha Zhang
- Division of Cardiology, Department of Internal Medicine, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Hubei Key Laboratory of Genetics and Molecular Mechanisms of Cardiological Disorders (Huazhong University of Science and Technology), Wuhan, P.R. China
| | - Hang Zhuang
- Division of Cardiology, Department of Internal Medicine, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Hubei Key Laboratory of Genetics and Molecular Mechanisms of Cardiological Disorders (Huazhong University of Science and Technology), Wuhan, P.R. China
| | - YuE Song
- Division of Cardiology, Department of Internal Medicine, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Hubei Key Laboratory of Genetics and Molecular Mechanisms of Cardiological Disorders (Huazhong University of Science and Technology), Wuhan, P.R. China
| | - Xiao Xiao
- Division of Molecular Pharmaceutics, Eshelman School of Pharmacy, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina
| | - Dao Wen Wang
- Division of Cardiology, Department of Internal Medicine, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Hubei Key Laboratory of Genetics and Molecular Mechanisms of Cardiological Disorders (Huazhong University of Science and Technology), Wuhan, P.R. China
| | - Jiangang Jiang
- Division of Cardiology, Department of Internal Medicine, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Hubei Key Laboratory of Genetics and Molecular Mechanisms of Cardiological Disorders (Huazhong University of Science and Technology), Wuhan, P.R. China
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Barragán-Bonilla MI, Mendoza-Bello JM, Aguilera P, Parra-Rojas I, Illades-Aguiar B, Ramírez M, Espinoza-Rojo M. Combined Administration of Streptozotocin and Sucrose Accelerates the Appearance of Type 2 Diabetes Symptoms in Rats. J Diabetes Res 2019; 2019:3791061. [PMID: 31355292 PMCID: PMC6637680 DOI: 10.1155/2019/3791061] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/11/2019] [Revised: 04/06/2019] [Accepted: 05/28/2019] [Indexed: 12/13/2022] Open
Abstract
Type 2 diabetes is a disease with a high global prevalence, characterized by chronic hyperglycemia, insulin resistance, polyphagia, polydipsia, polyuria, and changes in body weight. Animal models have been very useful for the study of this disease and to search for new therapeutic targets that delay, attenuate, or avoid diabetic complications. The purpose of this work was to establish a model of type 2 diabetes and exhibit the majority of the characteristics of the disease. Two-day-old male and female Wistar rats were treated once with streptozotocin (70 or 90 mg/kg body weight). After weaning, they were given a sucrose-sweetened beverage (SSB; sucrose at 10 or 30%) during 7 or 11 weeks; their body weight and food intake were measured daily. With the rats at 14 weeks of age, we determined the following: (a) fasting blood glucose, (b) oral glucose tolerance, and (c) insulin tolerance. We found that the supplementation of sucrose at 10% for 7 weeks in male rats which had previously been given streptozotocin (70 mg/kg) at neonatal stage leads to the appearance of the signs and symptoms of the characteristic of type 2 diabetes in adulthood.
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Affiliation(s)
- Martha Isela Barragán-Bonilla
- Laboratorio de Biología Molecular y Genómica de la Facultad de Ciencias Químico-Biológicas, Universidad Autónoma de Guerrero, Av. Lázaro Cárdenas S/N, Ciudad Universitaria, Chilpancingo de los Bravo, Gro. 39090, Mexico
| | - Juan Miguel Mendoza-Bello
- Laboratorio de Biología Molecular y Genómica de la Facultad de Ciencias Químico-Biológicas, Universidad Autónoma de Guerrero, Av. Lázaro Cárdenas S/N, Ciudad Universitaria, Chilpancingo de los Bravo, Gro. 39090, Mexico
| | - Penélope Aguilera
- Laboratorio de Patología Vascular Cerebral, Instituto Nacional de Neurología y Neurocirugía “Manuel Velasco Suárez”, Av. Insurgentes Sur 3877, Mexico City 14269, Mexico
| | - Isela Parra-Rojas
- Laboratorio de Obesidad y Diabetes de la Facultad de Ciencias Químico-Biológicas, Universidad Autónoma de Guerrero, Av. Lázaro Cárdenas S/N Ciudad Universitaria, Chilpancingo de los Bravo, Gro. 39090, Mexico
| | - Berenice Illades-Aguiar
- Laboratorio de Biomedicina Molecular de la Facultad de Ciencias Químico-Biológicas, Universidad Autónoma de Guerrero, Av. Lázaro Cárdenas S/N, Ciudad Universitaria, Chilpancingo de los Bravo, Gro. 39090, Mexico
| | - Mónica Ramírez
- CONACYT-Universidad Autónoma de Guerrero, Av. Javier Méndez Aponte No. 1, Fracc. Servidor Agrario, Chilpancingo de los Bravo, Gro. 39070, Mexico
| | - Mónica Espinoza-Rojo
- Laboratorio de Biología Molecular y Genómica de la Facultad de Ciencias Químico-Biológicas, Universidad Autónoma de Guerrero, Av. Lázaro Cárdenas S/N, Ciudad Universitaria, Chilpancingo de los Bravo, Gro. 39090, Mexico
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Combined treatment with melatonin and insulin improves glycemic control, white adipose tissue metabolism and reproductive axis of diabetic male rats. Life Sci 2018; 199:158-166. [PMID: 29501522 DOI: 10.1016/j.lfs.2018.02.040] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/27/2017] [Revised: 02/14/2018] [Accepted: 02/26/2018] [Indexed: 01/27/2023]
Abstract
AIMS Melatonin treatment has been reported to be capable of ameliorating metabolic diabetes-related abnormalities but also to cause hypogonadism in rats. We investigated whether the combined treatment with melatonin and insulin can improve insulin resistance and other metabolic disorders in rats with streptozotocin-induced diabetes during neonatal period and the repercussion of this treatment on the hypothalamic-pituitary-gonadal axis. MAIN METHODS At the fourth week of age, diabetic animals started an 8-wk treatment with only melatonin (0.2 mg/kg body weight) added to drinking water at night or associated with insulin (NHP, 1.5 U/100 g/day) or only insulin. Animals were then euthanized, and the subcutaneous (SC), epididymal (EP), and retroperitoneal (RP) fat pads were excised, weighed and processed for adipocyte isolation for morphometric analysis as well as for measuring glucose uptake, oxidation, and incorporation of glucose into lipids. Hypothalamus was collected for gene expression and blood samples were collected for biochemical assays. KEY FINDINGS The treatment with melatonin plus insulin (MI) was capable of maintaining glycemic control. In epididymal (EP) and subcutaneous (SC) adipocytes, the melatonin plus insulin (MI) treatment group recovered the insulin responsiveness. In the hypothalamus, melatonin treatment alone promoted a significant reduction in kisspeptin-1, neurokinin B and androgen receptor mRNA levels, in relation to control group. SIGNIFICANCE Combined treatment with melatonin and insulin promoted a better glycemic control, improving insulin sensitivity in white adipose tissue (WAT). Indeed, melatonin treatment reduced hypothalamic genes related to reproductive function.
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Fadda LM, Mohamed AM, Ali HM, Hagar H, Aldossari M. Prophylactic administration of carnosine and melatonin abates the incidence of renal toxicity induced by an over dose of titanium dioxide nanoparticles. J Biochem Mol Toxicol 2018; 32:e22040. [PMID: 29469982 DOI: 10.1002/jbt.22040] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/24/2017] [Revised: 01/22/2018] [Accepted: 01/25/2018] [Indexed: 11/08/2022]
Abstract
The alleviative effects of two antioxidants, carnosine (Car) and melatonin (Mel), against titanium dioxide nanoparticles (TiO2 -NPs) toxicity-induced oxidative and inflammatory renal damage were examined in rats. Administration of these antioxidants along with TiO2 -NPs effectively reduced serum urea, uric acid, creatinine, glucose, tumor necrosis factor-α, interleukin-6, C-reactive protein, immunoglobulin G, vascular endothelial growth factor, and nitric oxide, as well as a significant amelioration of the decrease in glutathione levels in renal tissue was observed, compared to those in rats treated with TiO2 -NPs alone. The renoprotective properties of the antioxidants were confirmed by reduced intensity of renal damage as demonstrated by histological findings. In conclusion, Car and Mel play protective roles against TiO2 -NPs-induced renal inflammation and oxidative injury, likely due to their antioxidant and anti-inflammatory properties.
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Affiliation(s)
- Laila Mohamed Fadda
- Pharmacology Department, Faculty of Pharmacy, King Saud University, Riyadh, Kingdom of Saudi Arabia
| | - Azza M Mohamed
- Biochemistry Department, Faculty of Science-Al Faisaliah, King Abdulaziz University, Jeddah, Kingdom of Saudi Arabia.,Therapeutic Chemistry Department, National Research Center, Dokki, Egypt
| | - Hanaa Mahmoud Ali
- Genetic and Cytology Department, National Research Center, Dokki, Egypt.,Common First Year Deanship, King Saud University, Riyadh, Kingdom of Saudi Arabia
| | - Hanan Hagar
- Pharmacology Unit (31), Medical College and King Khalid University Hospital, King Saud University, Riyadh, Kingdom of Saudi Arabia
| | - Manal Aldossari
- Master degree student at Pharmacology Department; Faculty of Pharmacy, King Saud University, Riyadh, KSA
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Bohlen TM, Silveira MA, Buonfiglio DDC, Ferreira-Neto HC, Cipolla-Neto J, Donato J, Frazao R. A Short-Day Photoperiod Delays the Timing of Puberty in Female Mice via Changes in the Kisspeptin System. Front Endocrinol (Lausanne) 2018; 9:44. [PMID: 29515520 PMCID: PMC5826198 DOI: 10.3389/fendo.2018.00044] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/23/2022] Open
Abstract
The reproduction of seasonal breeders is modulated by exposure to light in an interval of 24 h defined as photoperiod. The interruption of reproductive functions in seasonally breeding rodents is accompanied by the suppression of the Kiss1 gene expression, which is known to be essential for reproduction. In non-seasonal male rodents, such as rats and mice, short-day photoperiod (SP) conditions or exogenous melatonin treatment also have anti-gonadotropic effects; however, whether photoperiod is able to modulate the puberty onset or Kiss1 gene expression in mice is unknown. In the present study, we investigated whether photoperiodism influences the sexual maturation of female mice via changes in the kisspeptin system. We observed that SP condition delayed the timing of puberty in female mice, decreased the hypothalamic expression of genes related to the reproductive axis and reduced the number of Kiss1-expressing neurons in the rostral hypothalamus. However, SP also reduced the body weight gain during development and affected the expression of neuropeptides involved in the energy balance regulation. When body weight was recovered via a reduction in litter size, the timing of puberty in mice born and raised in SP was advanced and the effects in hypothalamic mRNA expression were reverted. These results suggest that the SP delays the timing of puberty in female mice via changes in the kisspeptin system, although the effects on hypothalamic-pituitary-gonadal axis are likely secondary to changes in body weight gain.
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Affiliation(s)
- Tabata Mariz Bohlen
- Department of Anatomy, Institute of Biomedical Sciences, University of São Paulo, São Paulo, Brazil
| | - Marina Augusto Silveira
- Department of Anatomy, Institute of Biomedical Sciences, University of São Paulo, São Paulo, Brazil
| | - Daniella do Carmo Buonfiglio
- Department of Physiology and Biophysics, Institute of Biomedical Sciences, University of São Paulo, São Paulo, Brazil
| | | | - José Cipolla-Neto
- Department of Physiology and Biophysics, Institute of Biomedical Sciences, University of São Paulo, São Paulo, Brazil
| | - Jose Donato
- Department of Physiology and Biophysics, Institute of Biomedical Sciences, University of São Paulo, São Paulo, Brazil
| | - Renata Frazao
- Department of Anatomy, Institute of Biomedical Sciences, University of São Paulo, São Paulo, Brazil
- *Correspondence: Renata Frazao,
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Reutrakul S, Sumritsopak R, Saetung S, Chanprasertyothin S, Chailurkit LO, Anothaisintawee T. Lower nocturnal urinary 6-sulfatoxymelatonin is associated with more severe insulin resistance in patients with prediabetes. Neurobiol Sleep Circadian Rhythms 2018; 4:10-16. [PMID: 31236502 PMCID: PMC6584596 DOI: 10.1016/j.nbscr.2017.06.001] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/31/2017] [Revised: 05/19/2017] [Accepted: 06/24/2017] [Indexed: 12/25/2022] Open
Abstract
OBJECTIVE Melatonin, a neurohormone secreted by the pineal gland, controls circadian rhythmicity, modulates sleep and plays a role in glucose metabolism. Low secretion of nocturnal urinary 6-sulfatoxymelatonin (aMT6S) was associated with incident diabetes. Sleep disturbances have also been shown to be risk factors for diabetes. In this study, we explored the relationship between nocturnal urinary aMT6s and markers of glucose metabolism in prediabetes patients, considering sleep related factors. METHODS Sixty two non-shift working patients with prediabetes [hemoglobin A1c (HbA1c) 5.7-6.49%] who were not on beta-blockers participated. Sleep duration and efficiency was recorded using 7-day actigraphy. Obstructive sleep apnea was evaluated using an overnight in-home monitoring device. Nocturnal urinary aMT6s/creatinine ratio was measured from an overnight urine sample. Oral glucose tolerance test (OGTT, 75-grams glucose) was performed, with measurements of insulin and glucose levels. RESULTS Mean (SD) age was 55.3 (8.2) years and mean HbA1c level was 6.01 (0.2)%. Mean (SD) sleep duration 6.0 (0.9) h, sleep efficiency was 83.4 (6.6)% and a median (interquartile rage) apnea hypopnea index was 10.3 (3.6, 16.4). Median nocturnal urinary aMT6s was 17.4 (9.4, 28.2) ng/mg creatinine. Higher nocturnal urinary aMT6s significantly correlated with lower fasting insulin (p = 0.004), lower insulin response to OGTT (p = 0.027), and lower fasting and whole body insulin resistance as indicated by lower HOMA-IR and higher Matsuda insulin sensitivity index (p = 0.006 and p = 0.011, respectively), but it was not correlated with fasting glucose, glucose response to OGTT, or HbA1c. Sleep duration inversely correlated with HbA1c but no other correlations were found between other sleep variables and markers of glucose metabolism or nocturnal urinary aMT6s. After adjusting for body mass index, higher nocturnal urinary aMT6s significantly correlated with lower HOMA-IR (p = 0.025) and fasting insulin levels (p = 0.014). CONCLUSION Nocturnal urinary aMT6s inversely correlated with fasting insulin resistance and insulin levels in patients with prediabetes. These results support the role of melatonin in glucose metabolism.
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Affiliation(s)
- Sirimon Reutrakul
- Division of Endocrinology and Metabolism, Department of Medicine, Faculty of Medicine Ramathibodi Hospital, Mahidol University, Bangkok, Thailand
| | - Rungtip Sumritsopak
- Division of Endocrinology and Metabolism, Department of Medicine, Faculty of Medicine Ramathibodi Hospital, Mahidol University, Bangkok, Thailand
| | - Sunee Saetung
- Division of Endocrinology and Metabolism, Department of Medicine, Faculty of Medicine Ramathibodi Hospital, Mahidol University, Bangkok, Thailand
| | - Suwannee Chanprasertyothin
- Research Center, Department of Medicine, Faculty of Medicine Ramathibodi Hospital, Mahidol University, Bangkok, Thailand
| | - La-or Chailurkit
- Division of Endocrinology and Metabolism, Department of Medicine, Faculty of Medicine Ramathibodi Hospital, Mahidol University, Bangkok, Thailand
| | - Thunyarat Anothaisintawee
- Department of Family Medicine, Faculty of Medicine Ramathibodi Hospital, Mahidol University, Bangkok, Thailand
- Section for Clinical Epidemiology and Biostatistics, Faculty of Medicine Ramathibodi Hospital, Mahidol University, Bangkok, Thailand
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Effects of Melatonin on Glucose Homeostasis, Antioxidant Ability, and Adipokine Secretion in ICR Mice with NA/STZ-Induced Hyperglycemia. Nutrients 2017; 9:nu9111187. [PMID: 29109369 PMCID: PMC5707659 DOI: 10.3390/nu9111187] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/01/2017] [Revised: 10/04/2017] [Accepted: 10/26/2017] [Indexed: 01/04/2023] Open
Abstract
Diabetes is often associated with decreased melatonin level. The aim was to investigate the effects of different dosage of melatonin on glucose hemostasis, antioxidant ability and adipokines secretion in diabetic institute for cancer research (ICR) mice. Forty animals were randomly divided into five groups including control (C), diabetic (D), low-dosage (L), medium-dosage (M), and high-dosage (H) groups. Groups L, M, and H, respectively, received oral melatonin at 10, 20, and 50 mg/kg of BW (body weight) daily after inducing hyperglycemia by nicotinamide (NA)/ streptozotocin (STZ). After the six-week intervention, results showed that melatonin administration increased insulin level and performed lower area under the curve (AUC) in H group (p < 0.05). Melatonin could lower hepatic Malondialdehyde (MDA) level in all melatonin-treated groups and increase superoxide dismutase activity in H group (p < 0.05). Melatonin-treated groups revealed significant higher adiponectin in L group, and lower leptin/adiponectin ratio and leptin in M and H groups (p < 0.05). Melatonin could lower cholesterol and triglyceride in liver and decrease plasma cholesterol and low-density lipoprotein-cholesterol (LDL-C) in L group, and increase plasma high-density lipoprotein-cholesterol (HDL-C) in H group (p < 0.05). Above all, melatonin could decrease oxidative stress, increase the adiponectin level and improve dyslipidemia, especially in H group. These data support melatonin possibly being a helpful aid for treating hyperglycemia-related symptoms.
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Pan XH, Huang X, Ruan GP, Pang RQ, Chen Q, Wang JX, He J, Zhao J, Cai XM, Zhao N, Chen Y, Zhu XQ. Umbilical cord mesenchymal stem cells are able to undergo differentiation into functional islet-like cells in type 2 diabetic tree shrews. Mol Cell Probes 2017; 34:1-12. [DOI: 10.1016/j.mcp.2017.04.002] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/09/2017] [Revised: 04/06/2017] [Accepted: 04/06/2017] [Indexed: 12/19/2022]
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Neu-P11, a novel MT1/MT2 agonist, reverses diabetes by suppressing the hypothalamic-pituitary-adrenal axis in rats. Eur J Pharmacol 2017; 812:225-233. [PMID: 28687198 DOI: 10.1016/j.ejphar.2017.07.001] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/29/2016] [Revised: 06/19/2017] [Accepted: 07/03/2017] [Indexed: 12/15/2022]
Abstract
Excessive glucocorticoid (GC) in type 2 diabetes mellitus (T2DM) reduces insulin sensitivity, impairs β-cell function, increases gluconeogenesis and glycogenolysis, impairs glucose uptake and metabolism, and reduces the insulinotropic effects of glucagon-like peptide 1. Melatonin, which serves as a physiological regulator of the hypothalamic-pituitary-adrenal (HPA) axis, has been suggested to have anti-diabetic effects. The objective of the present study was to investigate the effect of the MT1/MT2 melatonin agonist Neu-P11 on glucose and lipid metabolism in T2DM rats induced by a high fat diet combined with low doses of streptozotocin. T2DM rats were intragastrically administered melatonin (20mg/kg), Neu-P11 (20, 10, 5mg/kg), or a vehicle for 4 weeks. The results showed that the increased food intake, water consumption, hyperglycemia, glucose intolerance, and insulin resistance in T2DM rats were all improved by Neu-P11 treatment. Neu-P11 increased GC receptor expression and suppressed 11β-hydroxysteroid dehydrogenase 1 activity in the hippocampus by enhancing GC sensitivity and HPA feedback, thus decreasing the high GC levels. Transcript levels of the glucose metabolism-related genes peroxisome proliferator-activated receptor-γ, glucose transporter type-4, and adiponectin in adipose tissue were significantly increased after Neu-P11 treatment, while leptin mRNA was significantly decreased. Furthermore, MT1 and MT2 protein levels were enhanced by Neu-P11. These data suggest that normalization of the hyperactivated HPA axis by melatonin and Neu-P11 in T2DM regulates metabolic profiles and insulin sensitivity, which may attenuate insulin resistance and glucose homeostasis. Because Neu-P11 has superior pharmacokinetics and a longer half-life than melatonin, it might be beneficial in treating obesity and T2DM.
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Cunha AP, Ribeiro AC, Ricardo NM, Oliveira AC, Dávila LS, Cardoso JH, Rodrigues DC, Azeredo HM, Silva LM, Brito ES, Mendes Filho J, Rocha TM, Leal LK, Ricardo NM. Polysaccharides from Caesalpinia ferrea seeds – Chemical characterization and anti-diabetic effects in Wistar rats. Food Hydrocoll 2017. [DOI: 10.1016/j.foodhyd.2016.10.039] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
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Balci Yuce H, Karatas O, Aydemir Turkal H, Pirim Gorgun E, Ocakli S, Benli I, Cayli S. The Effect of Melatonin on Bone Loss, Diabetic Control, and Apoptosis in Rats With Diabetes With Ligature-Induced Periodontitis. J Periodontol 2015; 87:e35-43. [PMID: 26654347 DOI: 10.1902/jop.2015.150315] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
Abstract
BACKGROUND The aim of this study examines the effect of systemic melatonin administration on proinflammatory cytokine levels, apoptosis, alveolar bone loss (ABL), lipid metabolism, and diabetic control in in rats with diabetes mellitus (DM) and ligature-induced periodontitis. METHODS Fifty-two male Wistar rats were used in this study. Study groups were as follows: 1) non-ligated control (NL, n = 6); 2) streptozotocin (STZ, n = 8); 3) STZ and melatonin (STZ+Mel, n = 8); 4) ligature (L, n = 6); 5) ligature and melatonin (L+Mel, n = 8); 6) STZ and ligature (STZ+L, n = 8); and 7) STZ, ligature, and melatonin (STZ+L+Mel, n = 8). DM was induced by intraperitoneal injection of a single dose of STZ (60 mg/kg). Melatonin was administered by intraperitoneal injection of a dose of 10 mg/kg/day for 4 weeks. Silk ligatures were placed subgingivally around the mandibular right first molars. The study period was 4 weeks, and animals were sacrificed at the end of 4 weeks. Morphometric analysis of bone loss was performed. Tissues were histopathologically examined. Inducible nitric oxide synthase (iNOS) and B-cell lymphoma-2-associated X (bax) protein expressions, serum interleukin (IL)-1β levels, and tartrate-resistant acid phosphatase-positive (TRAP+) osteoclast numbers were also evaluated. RESULTS After 4 weeks, the highest ABL was observed in the STZ+L group, and the difference was significant (P <0.05). Systemically administered melatonin significantly decreased ABL in the STZ+L+Mel group compared with that in the STZ+L group (P <0.05). TRAP+ osteoclast numbers were the highest in the STZ+L group, and melatonin significantly decreased osteoclast numbers (P <0.05) but had no effect on iNOS, IL-1β, or bax levels. CONCLUSIONS Within the limits of this study, it can be concluded that systemic melatonin treatment may decrease osteoclastic activity and reduce ABL in the model using rats with DM.
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Affiliation(s)
- Hatice Balci Yuce
- Department of Periodontology, Faculty of Dentistry, Gaziosmanpaşa University, Tokat, Turkey
| | - Ozkan Karatas
- Department of Periodontology, Faculty of Dentistry, Gaziosmanpaşa University, Tokat, Turkey
| | - Humeyra Aydemir Turkal
- Department of Periodontology, Faculty of Dentistry, Gaziosmanpaşa University, Tokat, Turkey
| | - Emine Pirim Gorgun
- Department of Periodontology, Faculty of Dentistry, Cumhuriyet University, Sivas, Turkey
| | - Seda Ocakli
- Department of Histology and Embryology, Faculty of Medicine, Gaziosmanpaşa University
| | - Ismail Benli
- Department of Biochemistry, Faculty of Medicine, Gaziosmanpaşa University
| | - Sevil Cayli
- Department of Histology and Embryology, Faculty of Medicine, Yıldırım Beyazıt University, Ankara, Turkey
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Liu S, Guo Y, Yuan Q, Pan Y, Wang L, Liu Q, Wang F, Wang J, Hao A. Melatonin prevents neural tube defects in the offspring of diabetic pregnancy. J Pineal Res 2015; 59:508-17. [PMID: 26475080 DOI: 10.1111/jpi.12282] [Citation(s) in RCA: 34] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/14/2015] [Accepted: 10/02/2015] [Indexed: 01/11/2023]
Abstract
Melatonin, an endogenous neurohormone secreted by the pineal gland, has a variety of physiological functions and neuroprotective effects. However, its protective role on the neural tube defects (NTDs) was not very clear. The aim of this study was to investigate the effects of melatonin on the incidence of NTDs (including anencephaly, encephalocele, and spina bifida) of offspring from diabetic pregnant mice as well as its underlying mechanisms. Pregnant mice were given 10 mg/kg melatonin by daily i.p. injection from embryonic day (E) 0.5 until being killed on E11.5. Here, we showed that melatonin decreased the NTDs (especially exencephaly) rate of embryos exposed to maternal diabetes. Melatonin stimulated proliferation of neural stem cells (NSCs) under hyperglycemic condition through the extracellular regulated protein kinases (ERK) pathway. Furthermore, as a direct free radical scavenger, melatonin decreased apoptosis of NSCs exposed to hyperglycemia. In the light of these findings, it suggests that melatonin supplementation may play an important role in the prevention of neural malformations in diabetic pregnancy.
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Affiliation(s)
- Shangming Liu
- Key Laboratory of the Ministry of Education for Experimental Teratology, Department of Histology and Embryology, Shandong University School of Medicine, Jinan, Shandong, China
| | - Yuji Guo
- Key Laboratory of the Ministry of Education for Experimental Teratology, Department of Histology and Embryology, Shandong University School of Medicine, Jinan, Shandong, China
| | - Qiuhuan Yuan
- Key Laboratory of the Ministry of Education for Experimental Teratology, Department of Histology and Embryology, Shandong University School of Medicine, Jinan, Shandong, China
| | - Yan Pan
- Institute of Biomedical Engineering, Shandong University School of Medicine, Jinan, Shandong, China
| | - Liyan Wang
- Key Laboratory of the Ministry of Education for Experimental Teratology, Department of Histology and Embryology, Shandong University School of Medicine, Jinan, Shandong, China
| | - Qian Liu
- Key Laboratory of the Ministry of Education for Experimental Teratology, Department of Histology and Embryology, Shandong University School of Medicine, Jinan, Shandong, China
| | - Fuwu Wang
- Key Laboratory of the Ministry of Education for Experimental Teratology, Department of Histology and Embryology, Shandong University School of Medicine, Jinan, Shandong, China
| | - Jingjing Wang
- Institute of Pathology and Pathophysiology, Shandong University School of Medicine, Jinan, Shandong, China
| | - Aijun Hao
- Key Laboratory of the Ministry of Education for Experimental Teratology, Department of Histology and Embryology, Shandong University School of Medicine, Jinan, Shandong, China
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Szewczyk-Golec K, Woźniak A, Reiter RJ. Inter-relationships of the chronobiotic, melatonin, with leptin and adiponectin: implications for obesity. J Pineal Res 2015; 59:277-91. [PMID: 26103557 DOI: 10.1111/jpi.12257] [Citation(s) in RCA: 97] [Impact Index Per Article: 10.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/04/2015] [Accepted: 06/19/2015] [Indexed: 12/15/2022]
Abstract
Obesity and its medical complications represent a significant problem throughout the world. In recent decades, mechanisms underlying the progression of obesity have been intensively examined. The involvement of both the behavioral aspects, such as calorie-rich diet, low physical activity and sleep deprivation, and the intrinsic factors, including adipose tissue deregulation, chronic inflammation, oxidative stress, and chronodisruption, has been identified. The circadian disturbances of the adipose tissue endocrine function have been correlated with obesity. Leptin and adiponectin are adipokines strongly associated with glucose and lipid metabolism and with energy balance. Their synthesis and secretion display circadian rhythms that are disturbed in the obese state. Hyperleptinemia resulting in leptin resistance, and hypo-adiponectinemia have been linked to the pathophysiology of the obesity-related disorders. A deficiency of melatonin, one of the consequences of sleep deprivation, has also been demonstrated to correlate with obesity. Melatonin is a pineal secretory product involved in numerous actions, such as regulation of internal biological clocks and energy metabolism, and it functions as an antioxidant and as an anti-inflammatory agent. There exists a substantial amount of evidence supporting the beneficial effects of melatonin supplementation on obesity and its complications. In the current review, the results of studies related to the interactions between melatonin, and both leptin and adiponectin are discussed. Despite the existence of some inconsistencies, melatonin has been found to normalize the expression and secretion patterns of both adipokines. These results support the concept of melatonin as a potential therapeutic agent for obesity and related disorders.
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Affiliation(s)
- Karolina Szewczyk-Golec
- The Chair of Medical Biology, Nicolaus Copernicus University, Ludwik Rydygier Collegium Medicum, Bydgoszcz, Poland
| | - Alina Woźniak
- The Chair of Medical Biology, Nicolaus Copernicus University, Ludwik Rydygier Collegium Medicum, Bydgoszcz, Poland
| | - Russel J Reiter
- Department of Cellular and Structural Biology, University of Texas Health Science Center, San Antonio, TX, USA
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Kato H, Tanaka G, Masuda S, Ogasawara J, Sakurai T, Kizaki T, Ohno H, Izawa T. Melatonin promotes adipogenesis and mitochondrial biogenesis in 3T3-L1 preadipocytes. J Pineal Res 2015; 59:267-75. [PMID: 26123001 DOI: 10.1111/jpi.12259] [Citation(s) in RCA: 52] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/06/2015] [Accepted: 06/26/2015] [Indexed: 01/16/2023]
Abstract
Melatonin is synthesized in the pineal gland, but elicits a wide range of physiological responses in peripheral target tissues. Recent advances suggest that melatonin controls adiposity, resulting in changes in body weight. The aim of this study was to investigate the effect of melatonin on adipogenesis and mitochondrial biogenesis in 3T3-L1 mouse embryo fibroblasts. Melatonin significantly increased the expression of peroxisome proliferator-activated receptor-γ (PPAR-γ), a master regulator of adipogenesis, and promoted differentiation into adipocytes. Melatonin-treated cells also formed smaller lipid droplets and abundantly expressed several molecules associated with lipolysis, including adipose triglyceride lipase, perilipin, and comparative gene identification-58. Moreover, the hormone promoted biogenesis of mitochondria, as indicated by fluorescent staining, elevated the citrate synthase activity, and upregulated the expression of PPAR-γ coactivator 1 α, nuclear respiratory factor-1, and transcription factor A. The expression of uncoupling protein 1 was also observable both at mRNA and at protein level in melatonin-treated cells. Finally, adiponectin secretion and the expression of adiponectin receptors were enhanced. These results suggest that melatonin promotes adipogenesis, lipolysis, mitochondrial biogenesis, and adiponectin secretion. Thus, melatonin has potential as an anti-obesity agent that may reverse obesity-related disorders.
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Affiliation(s)
- Hisashi Kato
- Graduate School of Health and Sports Science, Doshisha University, Kyotanabe, Kyoto, Japan
| | - Goki Tanaka
- Graduate School of Health and Sports Science, Doshisha University, Kyotanabe, Kyoto, Japan
| | - Shinya Masuda
- Division of Diabetic Research, Clinical Research Institute, National Hospital Organization, Kyoto Medical Center, Fushimi, Kyoto, Japan
| | - Junetsu Ogasawara
- Department of Molecular Predictive Medicine and Sports Science, Kyorin University, Mitaka, Tokyo, Japan
| | - Takuya Sakurai
- Department of Molecular Predictive Medicine and Sports Science, Kyorin University, Mitaka, Tokyo, Japan
| | - Takako Kizaki
- Department of Molecular Predictive Medicine and Sports Science, Kyorin University, Mitaka, Tokyo, Japan
| | - Hideki Ohno
- Department of Molecular Predictive Medicine and Sports Science, Kyorin University, Mitaka, Tokyo, Japan
| | - Tetsuya Izawa
- Graduate School of Health and Sports Science, Doshisha University, Kyotanabe, Kyoto, Japan
- Faculty of Health and Sports Science, Doshisha University, Kyotanabe, Kyoto, Japan
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Ali MA, El-Abhar HS, Kamel MA, Attia AS. Antidiabetic Effect of Galantamine: Novel Effect for a Known Centrally Acting Drug. PLoS One 2015; 10:e0134648. [PMID: 26262991 PMCID: PMC4532414 DOI: 10.1371/journal.pone.0134648] [Citation(s) in RCA: 32] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/21/2015] [Accepted: 07/10/2015] [Indexed: 01/26/2023] Open
Abstract
The cholinergic anti-inflammatory pathway is one of the putative biochemical pathways that link diabetes with Alzheimer disease. Hence, we aimed to verify the potential antidiabetic effect of galantamine, unveil the possible mechanisms and evaluate its interaction with vildagliptin. The n5-STZ rat model was adopted and the diabetic animals were treated with galantamine and/or vildagliptin for 4 weeks. Galantamine lowered the n5-STZ-induced elevation in body weight, food/water intake, serum levels of glucose, fructosamine, and ALT/AST, as well as AChE in the tested organs. Moreover, it modulated successfully the lipid profile assessed in serum, liver, and muscle, and increased serum insulin level, as well as % β-cell function, in a pattern similar to that of vildagliptin. Additionally, galantamine confirmed its antioxidant (Nrf2, TAC, MDA), anti-inflammatory (NF-κB, TNF-α, visfatin, adiponectin) and anti-apoptotic (caspase-3, cytochrome c) capabilities by altering the n5-STZ effect on all the aforementioned parameters. On the molecular level, galantamine/vildagliptin have improved the insulin (p-insulin receptor, p-Akt, GLUT4/GLUT2) and Wnt/β-catenin (p-GSK-3β, β-catenin) signaling pathways. On almost all parameters, the galantamine effects surpassed that of vildagliptin, while the combination regimen showed the best effects. The present results clearly proved that galantamine modulated glucose/lipid profile possibly through its anti-oxidant, -apoptotic, -inflammatory and -cholinesterase properties. These effects could be attributed partly to the enhancement of insulin and Wnt/β-catenin signaling pathways. Galantamine can be strongly considered as a potential antidiabetic agent and as an add-on therapy with other oral antidiabetics.
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Affiliation(s)
- Mennatallah A. Ali
- Department of Pharmacology & Toxicology, Faculty of Pharmacy and Drug Manufacturing, Pharos University, Alexandria, Egypt
| | - Hanan S. El-Abhar
- Department of Pharmacology & Toxicology, Faculty of Pharmacy, Cairo University, Cairo, Egypt
| | - Maher A. Kamel
- Department of Biochemistry, Medical Research Institute, Alexandria University, Alexandria, Egypt
| | - Ahmed S. Attia
- Department of Microbiology and Immunology, Faculty of Pharmacy, Cairo University, Cairo, Egypt
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Quan X, Wang J, Liang C, Zheng H, Zhang L. Melatonin inhibits tunicamycin-induced endoplasmic reticulum stress and insulin resistance in skeletal muscle cells. Biochem Biophys Res Commun 2015; 463:1102-7. [DOI: 10.1016/j.bbrc.2015.06.065] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/05/2015] [Accepted: 06/09/2015] [Indexed: 10/23/2022]
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Oliveira AC, Andreotti S, Chimin P, Sertié RAL, Farias TDSM, Torres-Leal FL, de Proença ARG, Campaña AB, D'Avila LSP, Oliveira KA, Lima FB. Neonatal streptozotocin-induced diabetes in mothers promotes metabolic programming of adipose tissue in male rat offspring. Life Sci 2015; 136:151-6. [PMID: 26144624 DOI: 10.1016/j.lfs.2015.06.024] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/28/2015] [Revised: 06/02/2015] [Accepted: 06/30/2015] [Indexed: 12/26/2022]
Abstract
AIMS Maternal hyperglycemia during pregnancy can lead to fetal changes, like macrosomia or obesity in adultlife. Experimentalmodels of diabetes have been studied to evaluate the consequences of offspring lipidmetabolism. This study aimed to investigate the metabolic changes in adipose tissue of offspring of streptozotocininduced diabetic mothers during neonatal period. MAIN METHODS Diabetes was induced in female rats by streptozotocin administration on 5th day of life. In adulthood, female rats were bred with control male rats. Male puppies were sacrificed on 12th week of life and epididymal (EP) and subcutaneous (SC) adipose fat pads were excised and weighted. Adipocytes were isolated and evaluated for basal and insulin-stimulated 2-deoxyglucose uptake, oxidation of glucose into CO2, and incorporationof glucose into lipids and lipolytic capacity. KEY FINDINGS Bodyweight, EP fat padweight and diameter of adipocytes fromoffspring of diabeticmothers were increased in comparison to offspring of control mothers. EP adipocytes from offspring of diabetic mothers presented increased basal and insulin stimulated glucose uptake in comparison to control ones. Similar pattern was observed for glucose oxidation into CO2 and incorporation into lipids. However, significant difference in lipolytic capacity in vitrowas not observed. Protein content of GLUT4, insulin receptor and acetyl-CoA carboxylase was significantly increased in EP fat pad of offspring of diabetic mothers in relation to control group. SIGNIFICANCE Metabolic programming occurred in the adipose tissue of offspring of diabetic mothers, increasing its capacity to store lipids with no changes in lipolytic capacity.
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Affiliation(s)
- Ariclécio C Oliveira
- Superior Institute of Biomedical Sciences, State University of Ceará, Brazil; Department of Physiology and Biophysics, Institute of Biomedical Sciences, University of São Paulo, Brazil.
| | - Sandra Andreotti
- Department of Physiology and Biophysics, Institute of Biomedical Sciences, University of São Paulo, Brazil
| | - Patricia Chimin
- Department of Physiology and Biophysics, Institute of Biomedical Sciences, University of São Paulo, Brazil
| | - Rogério A L Sertié
- Department of Physiology and Biophysics, Institute of Biomedical Sciences, University of São Paulo, Brazil
| | - Talita da S M Farias
- Department of Physiology and Biophysics, Institute of Biomedical Sciences, University of São Paulo, Brazil
| | - Francisco L Torres-Leal
- Department of Physiology and Biophysics, Institute of Biomedical Sciences, University of São Paulo, Brazil; Department of Biophysics and Physiology, Federal University of Piauí, Brazil
| | - André R G de Proença
- Department of Physiology and Biophysics, Institute of Biomedical Sciences, University of São Paulo, Brazil
| | - Amanda B Campaña
- Department of Physiology and Biophysics, Institute of Biomedical Sciences, University of São Paulo, Brazil
| | | | - Keciany A Oliveira
- Superior Institute of Biomedical Sciences, State University of Ceará, Brazil
| | - Fábio B Lima
- Department of Physiology and Biophysics, Institute of Biomedical Sciences, University of São Paulo, Brazil
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Briançon-Marjollet A, Weiszenstein M, Henri M, Thomas A, Godin-Ribuot D, Polak J. The impact of sleep disorders on glucose metabolism: endocrine and molecular mechanisms. Diabetol Metab Syndr 2015. [PMID: 25834642 DOI: 10.1186/s13098- 015-0018-3] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/30/2022] Open
Abstract
Modern lifestyle has profoundly modified human sleep habits. Sleep duration has shortened over recent decades from 8 to 6.5 hours resulting in chronic sleep deprivation. Additionally, irregular sleep, shift work and travelling across time zones lead to disruption of circadian rhythms and asynchrony between the master hypothalamic clock and pacemakers in peripheral tissues. Furthermore, obstructive sleep apnea syndrome (OSA), which affects 4 - 15% of the population, is not only characterized by impaired sleep architecture but also by repetitive hemoglobin desaturations during sleep. Epidemiological studies have identified impaired sleep as an independent risk factor for all cause of-, as well as for cardiovascular, mortality/morbidity. More recently, sleep abnormalities were causally linked to impairments in glucose homeostasis, metabolic syndrome and Type 2 Diabetes Mellitus (T2DM). This review summarized current knowledge on the metabolic alterations associated with the most prevalent sleep disturbances, i.e. short sleep duration, shift work and OSA. We have focused on various endocrine and molecular mechanisms underlying the associations between inadequate sleep quality, quantity and timing with impaired glucose tolerance, insulin resistance and pancreatic β-cell dysfunction. Of these mechanisms, the role of the hypothalamic-pituitary-adrenal axis, circadian pacemakers in peripheral tissues, adipose tissue metabolism, sympathetic nervous system activation, oxidative stress and whole-body inflammation are discussed. Additionally, the impact of intermittent hypoxia and sleep fragmentation (key components of OSA) on intracellular signaling and metabolism in muscle, liver, fat and pancreas are also examined. In summary, this review provides endocrine and molecular explanations for the associations between common sleep disturbances and the pathogenesis of T2DM.
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Affiliation(s)
- Anne Briançon-Marjollet
- Université Grenoble Alpes, HP2, F-38041 Grenoble, Cedex France.,INSERM U1042, F-38041 Grenoble, Cedex France
| | - Martin Weiszenstein
- Centre for Research on Diabetes, Metabolism and Nutrition, Third Faculty of Medicine, Charles University, Prague, Czech Republic
| | - Marion Henri
- Université Grenoble Alpes, HP2, F-38041 Grenoble, Cedex France.,INSERM U1042, F-38041 Grenoble, Cedex France
| | - Amandine Thomas
- Université Grenoble Alpes, HP2, F-38041 Grenoble, Cedex France.,INSERM U1042, F-38041 Grenoble, Cedex France
| | - Diane Godin-Ribuot
- Université Grenoble Alpes, HP2, F-38041 Grenoble, Cedex France.,INSERM U1042, F-38041 Grenoble, Cedex France
| | - Jan Polak
- Centre for Research on Diabetes, Metabolism and Nutrition, Third Faculty of Medicine, Charles University, Prague, Czech Republic.,2nd Internal Medicine Department, University Hospital Kralovske Vinohrady, Prague, Czech Republic.,Sports Medicine Department, Third Faculty of Medicine, Charles University in Prague, Ruska 87, Praha 10, 100 00 Czech Republic
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32
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Briançon-Marjollet A, Weiszenstein M, Henri M, Thomas A, Godin-Ribuot D, Polak J. The impact of sleep disorders on glucose metabolism: endocrine and molecular mechanisms. Diabetol Metab Syndr 2015; 7:25. [PMID: 25834642 PMCID: PMC4381534 DOI: 10.1186/s13098-015-0018-3] [Citation(s) in RCA: 138] [Impact Index Per Article: 15.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/03/2014] [Accepted: 03/05/2015] [Indexed: 12/11/2022] Open
Abstract
Modern lifestyle has profoundly modified human sleep habits. Sleep duration has shortened over recent decades from 8 to 6.5 hours resulting in chronic sleep deprivation. Additionally, irregular sleep, shift work and travelling across time zones lead to disruption of circadian rhythms and asynchrony between the master hypothalamic clock and pacemakers in peripheral tissues. Furthermore, obstructive sleep apnea syndrome (OSA), which affects 4 - 15% of the population, is not only characterized by impaired sleep architecture but also by repetitive hemoglobin desaturations during sleep. Epidemiological studies have identified impaired sleep as an independent risk factor for all cause of-, as well as for cardiovascular, mortality/morbidity. More recently, sleep abnormalities were causally linked to impairments in glucose homeostasis, metabolic syndrome and Type 2 Diabetes Mellitus (T2DM). This review summarized current knowledge on the metabolic alterations associated with the most prevalent sleep disturbances, i.e. short sleep duration, shift work and OSA. We have focused on various endocrine and molecular mechanisms underlying the associations between inadequate sleep quality, quantity and timing with impaired glucose tolerance, insulin resistance and pancreatic β-cell dysfunction. Of these mechanisms, the role of the hypothalamic-pituitary-adrenal axis, circadian pacemakers in peripheral tissues, adipose tissue metabolism, sympathetic nervous system activation, oxidative stress and whole-body inflammation are discussed. Additionally, the impact of intermittent hypoxia and sleep fragmentation (key components of OSA) on intracellular signaling and metabolism in muscle, liver, fat and pancreas are also examined. In summary, this review provides endocrine and molecular explanations for the associations between common sleep disturbances and the pathogenesis of T2DM.
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Affiliation(s)
- Anne Briançon-Marjollet
- />Université Grenoble Alpes, HP2, F-38041 Grenoble, Cedex France
- />INSERM U1042, F-38041 Grenoble, Cedex France
| | - Martin Weiszenstein
- />Centre for Research on Diabetes, Metabolism and Nutrition, Third Faculty of Medicine, Charles University, Prague, Czech Republic
| | - Marion Henri
- />Université Grenoble Alpes, HP2, F-38041 Grenoble, Cedex France
- />INSERM U1042, F-38041 Grenoble, Cedex France
| | - Amandine Thomas
- />Université Grenoble Alpes, HP2, F-38041 Grenoble, Cedex France
- />INSERM U1042, F-38041 Grenoble, Cedex France
| | - Diane Godin-Ribuot
- />Université Grenoble Alpes, HP2, F-38041 Grenoble, Cedex France
- />INSERM U1042, F-38041 Grenoble, Cedex France
| | - Jan Polak
- />Centre for Research on Diabetes, Metabolism and Nutrition, Third Faculty of Medicine, Charles University, Prague, Czech Republic
- />2nd Internal Medicine Department, University Hospital Kralovske Vinohrady, Prague, Czech Republic
- />Sports Medicine Department, Third Faculty of Medicine, Charles University in Prague, Ruska 87, Praha 10, 100 00 Czech Republic
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Teodoro BG, Baraldi FG, Sampaio IH, Bomfim LHM, Queiroz AL, Passos MA, Carneiro EM, Alberici LC, Gomis R, Amaral FG, Cipolla-Neto J, Araújo MB, Lima T, Akira Uyemura S, Silveira LR, Vieira E. Melatonin prevents mitochondrial dysfunction and insulin resistance in rat skeletal muscle. J Pineal Res 2014; 57:155-67. [PMID: 24981026 DOI: 10.1111/jpi.12157] [Citation(s) in RCA: 76] [Impact Index Per Article: 7.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/02/2014] [Accepted: 06/27/2014] [Indexed: 01/02/2023]
Abstract
Melatonin has a number of beneficial metabolic actions and reduced levels of melatonin may contribute to type 2 diabetes. The present study investigated the metabolic pathways involved in the effects of melatonin on mitochondrial function and insulin resistance in rat skeletal muscle. The effect of melatonin was tested both in vitro in isolated rats skeletal muscle cells and in vivo using pinealectomized rats (PNX). Insulin resistance was induced in vitro by treating primary rat skeletal muscle cells with palmitic acid for 24 hr. Insulin-stimulated glucose uptake was reduced by palmitic acid followed by decreased phosphorylation of AKT which was prevented my melatonin. Palmitic acid reduced mitochondrial respiration, genes involved in mitochondrial biogenesis and the levels of tricarboxylic acid cycle intermediates whereas melatonin counteracted all these parameters in insulin-resistant cells. Melatonin treatment increases CAMKII and p-CREB but had no effect on p-AMPK. Silencing of CREB protein by siRNA reduced mitochondrial respiration mimicking the effect of palmitic acid and prevented melatonin-induced increase in p-AKT in palmitic acid-treated cells. PNX rats exhibited mild glucose intolerance, decreased energy expenditure and decreased p-AKT, mitochondrial respiration, and p-CREB and PGC-1 alpha levels in skeletal muscle which were restored by melatonin treatment in PNX rats. In summary, we showed that melatonin could prevent mitochondrial dysfunction and insulin resistance via activation of CREB-PGC-1 alpha pathway. Thus, the present work shows that melatonin play an important role in skeletal muscle mitochondrial function which could explain some of the beneficial effects of melatonin in insulin resistance states.
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Affiliation(s)
- Bruno G Teodoro
- Department of Biochemistry and Immunology, Faculty of Medicine of Ribeirão Preto, University of Sao Paulo (USP), Ribeirão Preto, Brazil; Federal Institute of Science Education and Technology of São Paulo, Sao Paulo, Brazil
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She M, Laudon M, Yin W. Melatonin receptors in diabetes: a potential new therapeutical target? Eur J Pharmacol 2014; 744:220-3. [PMID: 25160745 DOI: 10.1016/j.ejphar.2014.08.012] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/26/2014] [Revised: 08/08/2014] [Accepted: 08/18/2014] [Indexed: 01/13/2023]
Abstract
Melatonin is synthesized and secreted mainly by the pineal gland in a circadian fashion, and it thus mediates endogenous circadian rhythms and influences other physiological functions. Both the G-protein coupled receptors MT1 (encoded by MTNR1A) and MT2 (encoded by MTNR1B) in mammals mediate the actions of melatonin. Evidence from in vivo and in vitro studies proved a key role of melatonin in the regulation of glucose metabolism and the pathogenesis of diabetes, as further confirmed by the recent studies of human genetic variants of MTNR1B. Remarkably, it was also suggested that genetic variations within MTNR1B disordered β-cells function directly, i.e. insulin secretion. This indicated the functional link between MT2 and T2D risk at the protein level, and it may represent the prevailing pathomechanism for how impaired melatonin signaling causes metabolic disorders and increases the T2D risk. It is speculated that melatonin and its receptors may be a new therapeutic avenue in diabetes.
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Affiliation(s)
- Meihua She
- Institute of Cardiovascular Research, Key Laboratory for Arteriosclerology of Hunan Province, University of South China, Hengyang 421001, China; Department of Biochemistry and Molecular Biology, School of Pharmaceutical and Biological Science, University of South China, Hengyang, China
| | - Moshe Laudon
- Drug Discovery, Neurim Pharmaceuticals Ltd., Tel Aviv, Israel
| | - Weidong Yin
- Institute of Cardiovascular Research, Key Laboratory for Arteriosclerology of Hunan Province, University of South China, Hengyang 421001, China; Department of Biochemistry and Molecular Biology, School of Pharmaceutical and Biological Science, University of South China, Hengyang, China.
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Bibak B, Khalili M, Rajaei Z, Soukhtanloo M, Hadjzadeh MAR, Hayatdavoudi P. Effects of melatonin on biochemical factors and food and water consumption in diabetic rats. Adv Biomed Res 2014; 3:173. [PMID: 25250287 PMCID: PMC4166052 DOI: 10.4103/2277-9175.139191] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/18/2013] [Accepted: 08/18/2013] [Indexed: 11/20/2022] Open
Abstract
Background: Diabetic neuropathy is one of the serious problems due to microvessel vasculopathy in diabetes. It has been reported that hyperglycemia and hypertriglyceridemia are the underlying mechanisms in inducing and progression of diabetic neuropathy. The aim of the present study was to investigate the effects of melatonin on serum glucose and lipid levels, as well as food consumption and water intake in streptozotocin-induced diabetic rats. Materials and Methods: Eighty male Wistar rats were randomly assigned to six groups including; normal control group, diabetic control group and 4 diabetic experimental groups that received melatonin intraperitoneally at doses of 2.5, 5, 10, and 20 mg/kg at the end of sixth week after verification of neuropathy by means of evaluation of sciatic nerve conduction velocity (MNCV), for two weeks. Blood glucose and lipid levels, body weight, the amounts of food consumption, and water intake were determined in all groups at weeks 0 (before diabetes induction), 3, 6, and at the end of eighth week. Results: Treatment with melatonin reduced significantly the serum glucose (P < 0.001) and triglyceride (P < 0.05) levels, food consumption (P < 0.001), and water intake (P < 0.001) in diabetic rats at the end of eighth week. However, melatonin had no significant effect on body weight of diabetic animals. Conclusions: Treatment with melatonin could improve several signs of diabetes, including hyperglycemia, hypertriglyceridemia, polyphagia, and polydipsia. Therefore, melatonin may be used as an adjunct therapy in the treatment of diabetes.
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Affiliation(s)
- Bahram Bibak
- Department of Physiology, School of Medicine, North Khorasan University of Medical Sciences, Bojnourd, Iran
| | - Monavareh Khalili
- Neurocognitive Research Center and Department of Physiology, Mashhad University of Medical Sciences, Mashhad, Iran
| | - Ziba Rajaei
- Department of Physiology, School of Medicine, Isfahan University of Medical Sciences, Isfahan, Iran
| | - Mohammad Soukhtanloo
- Department of Biochemistry, School of Medicine, Mashhad University of Medical Sciences, Mashhad, Iran
| | - Mousa-Al-Reza Hadjzadeh
- Neurocognitive Research Center and Department of Physiology, Mashhad University of Medical Sciences, Mashhad, Iran
| | - Parichehr Hayatdavoudi
- Neurocognitive Research Center and Department of Physiology, Mashhad University of Medical Sciences, Mashhad, Iran
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Ren J, Xiang AH, Trigo E, Takayanagi M, Beale E, Lawrence JM, Hartiala J, Richey JM, Allayee H, Buchanan TA, Watanabe RM. Genetic variation in MTNR1B is associated with gestational diabetes mellitus and contributes only to the absolute level of beta cell compensation in Mexican Americans. Diabetologia 2014; 57:1391-9. [PMID: 24728128 PMCID: PMC4117246 DOI: 10.1007/s00125-014-3239-3] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/13/2014] [Accepted: 03/25/2014] [Indexed: 01/27/2023]
Abstract
AIMS/HYPOTHESIS MTNR1B is a type 2 diabetes susceptibility locus associated with cross-sectional measures of insulin secretion. We hypothesised that variation in MTNR1B contributes to the absolute level of a diabetes-related trait, temporal rate of change in that trait, or both. METHODS We tested rs10830963 for association with cross-sectional diabetes-related traits in up to 1,383 individuals or with rate of change in the same phenotypes over a 3-5 year follow-up in up to 374 individuals from the family-based BetaGene study of Mexican Americans. RESULTS rs10830963 was associated cross-sectionally with fasting glucose (p = 0.0069), acute insulin response (AIR; p = 0.0013), disposition index (p = 0.00078), glucose effectiveness (p = 0.018) and gestational diabetes mellitus (OR 1.48; p = 0.012), but not with OGTT 30 min Δinsulin (the difference between the 30 min and fasting plasma insulin concentration) or 30 min insulin-based disposition index. rs10830963 was also associated with rate of change in fasting glucose (p = 0.043), OGTT 30 min Δinsulin (p = 0.01) and AIR (p = 0.037). There was no evidence for an association with the rate of change in beta cell compensation for insulin resistance. CONCLUSIONS/INTERPRETATION We conclude that variation in MTNR1B contributes to the absolute level of insulin secretion but not to differences in the temporal rate of change in insulin secretion. The observed association with the rate of change in insulin secretion reflects the natural physiological response to changes in underlying insulin sensitivity and is not a direct effect of the variant.
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Affiliation(s)
- Jie Ren
- Department of Preventive Medicine, Keck School of Medicine of USC, 2250 Alcazar St, Los Angeles, CA, 90089-9073, USA
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Cipolla-Neto J, Amaral FG, Afeche SC, Tan DX, Reiter RJ. Melatonin, energy metabolism, and obesity: a review. J Pineal Res 2014; 56:371-81. [PMID: 24654916 DOI: 10.1111/jpi.12137] [Citation(s) in RCA: 362] [Impact Index Per Article: 36.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/15/2014] [Accepted: 03/17/2014] [Indexed: 12/15/2022]
Abstract
Melatonin is an old and ubiquitous molecule in nature showing multiple mechanisms of action and functions in practically every living organism. In mammals, pineal melatonin functions as a hormone and a chronobiotic, playing a major role in the regulation of the circadian temporal internal order. The anti-obesogen and the weight-reducing effects of melatonin depend on several mechanisms and actions. Experimental evidence demonstrates that melatonin is necessary for the proper synthesis, secretion, and action of insulin. Melatonin acts by regulating GLUT4 expression and/or triggering, via its G-protein-coupled membrane receptors, the phosphorylation of the insulin receptor and its intracellular substrates mobilizing the insulin-signaling pathway. Melatonin is a powerful chronobiotic being responsible, in part, by the daily distribution of metabolic processes so that the activity/feeding phase of the day is associated with high insulin sensitivity, and the rest/fasting is synchronized to the insulin-resistant metabolic phase of the day. Furthermore, melatonin is responsible for the establishment of an adequate energy balance mainly by regulating energy flow to and from the stores and directly regulating the energy expenditure through the activation of brown adipose tissue and participating in the browning process of white adipose tissue. The reduction in melatonin production, as during aging, shift-work or illuminated environments during the night, induces insulin resistance, glucose intolerance, sleep disturbance, and metabolic circadian disorganization characterizing a state of chronodisruption leading to obesity. The available evidence supports the suggestion that melatonin replacement therapy might contribute to restore a more healthy state of the organism.
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Affiliation(s)
- J Cipolla-Neto
- Department of Physiology and Biophysics, Institute of Biomedical Sciences, University of São Paulo, São Paulo, Brazil
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Park JH, Shim HM, Na AY, Bae KC, Bae JH, Im SS, Cho HC, Song DK. Melatonin prevents pancreatic β-cell loss due to glucotoxicity: the relationship between oxidative stress and endoplasmic reticulum stress. J Pineal Res 2014; 56:143-53. [PMID: 24168371 DOI: 10.1111/jpi.12106] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/22/2013] [Accepted: 10/25/2013] [Indexed: 12/31/2022]
Abstract
Prolonged hyperglycemia results in pancreatic β-cell dysfunction and apoptosis, referred to as glucotoxicity. Although both oxidative and endoplasmic reticulum (ER) stresses have been implicated as major causative mechanisms of β-cell glucotoxicity, the reciprocal importance between the two remains to be elucidated. The aim of this study was to evaluate the differential effect of oxidative stress and ER stress on β-cell glucotoxicity, by employing melatonin which has free radical-scavenging and antioxidant properties. As expected, in β-cells exposed to prolonged high glucose levels, cell viability and glucose-stimulated insulin secretion (GSIS) were significantly impaired. Melatonin treatment markedly attenuated cellular apoptosis by scavenging reactive oxygen species via its plasmalemmal receptor-independent increase in antioxidant enzyme activity. However, treatments with antioxidants alone were insufficient to recover the impaired GSIS. Interestingly, 4-phenylbutyric acid (4-PBA), a chemical chaperone that attenuate ER stress by stabilizing protein structure, alleviated the impaired GSIS, but not apoptosis, suggesting that glucotoxicity induces oxidative and ER stress independently. We found that cotreatment of glucotoxic β-cells with melatonin and 4-PBA dramatically improved both their survival and insulin secretion. Taken together, these results suggest that ER stress may be the more critical mechanism for prolonged high-glucose-induced GSIS impairment, whereas oxidative stress appears to be more critical for the impaired β-cell viability. Therefore, combinatorial therapy of melatonin with an ER stress modifier may help recover pancreatic β-cells under glucotoxic conditions in type 2 diabetes.
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Affiliation(s)
- Jae-Hyung Park
- Department of Physiology, Keimyung University School of Medicine, Daegu, Korea
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Piromelatine decreases triglyceride accumulation in insulin resistant 3T3-L1 adipocytes: Role of ATGL and HSL. Biochimie 2013; 95:1650-4. [DOI: 10.1016/j.biochi.2013.05.005] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/30/2012] [Accepted: 05/14/2013] [Indexed: 11/21/2022]
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Konenkov VI, Klimontov VV, Michurina SV, Prudnikova MA, Ishenko IJ. Melatonin and diabetes: from pathophysiology to the treatment perspectives. DIABETES MELLITUS 2013. [DOI: 10.14341/2072-0351-3751] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/20/2023]
Abstract
Pineal hormone melatonin synchronizes insulin secretion and glucose homeostasis with solar periods. Misalliance between melatonin-mediated circadian rhythms and insulin secretion characterizes diabetes mellitus type 1 (T1DM) and type 2 (T2DM). Insulin deficiency in T1DM is accompanied by increased melatonin production. Conversely, T2DM is characterized by diminished melatonin secretion. In genome-wide association studies the variants of melatonin receptor MT2 gene (rs1387153 and rs10830963) were associated with fasting glucose, beta-cell function and T2DM. In experimental models of diabetes melatonin enhanced beta-cell proliferation and neogenesis, improved insulin resistance and alleviated oxidative stress in retina and kidneys. However, further investigation is required to assess the therapeutic value of melatonin in diabetic patients.
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Huang HJ, Chen YH, Liang KC, Jheng YS, Jhao JJ, Su MT, Lee-Chen GJ, Hsieh-Li HM. Exendin-4 protected against cognitive dysfunction in hyperglycemic mice receiving an intrahippocampal lipopolysaccharide injection. PLoS One 2012; 7:e39656. [PMID: 22844396 PMCID: PMC3402484 DOI: 10.1371/journal.pone.0039656] [Citation(s) in RCA: 51] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/29/2012] [Accepted: 05/24/2012] [Indexed: 01/02/2023] Open
Abstract
Background Chronic hyperglycemia-associated inflammation plays critical roles in disease initiation and the progression of diabetic complications, including Alzheimer’s disease (AD). However, the association of chronic hyperglycemia with acute inflammation of the central nervous system in the progression of AD still needs to be elucidated. In addition, recent evidence suggests that Glucagon-like peptide-1 receptor (GLP-1R) protects against neuronal damage in the brain. Therefore, the neuroprotective effects of the GLP-1R agonist exendin-4 (EX-4) against hyperglycemia/lipopolysaccharides (LPS) damage were also evaluated in this study. Methodology/Principal Findings Ten days after streptozotocin (STZ) or vehicle (sodium citrate) treatment in mice, EX-4 treatment (10 µg/kg/day) was applied to the mice before intrahippocampal CA1 injection of LPS or vehicle (saline) and continued for 28 days. This study examined the molecular alterations in these mice after LPS and EX4 application, respectively. The mouse cognitive function was evaluated during the last 6 days of EX-4 treatment. The results showed that the activation of NF-κB-related inflammatory responses induced cognitive dysfunction in both the hyperglycemic mice and the mice that received acute intrahippocampal LPS injection. Furthermore, acute intrahippocampal LPS injection exacerbated the impairment of spatial learning and memory through a strong decrease in monoaminergic neurons and increases in astrocytes activation and apoptosis in the hyperglycemic mice. However, EX-4 treatment protected against the cognitive dysfunction resulting from hyperglycemia or/and intrahippocampal LPS injection. Conclusions/Significance These findings reveal that both hyperglycemia and intrahippocampal LPS injection induced cognitive dysfunction via activation of NF-κB-related inflammatory responses. However, acute intrahippocampal LPS injection exacerbated the progression of cognitive dysfunction in the hyperglycemic mice via a large increase in astrocytes activation-related responses. Furthermore, EX-4 might be considered as a potential adjuvant entity to protect against neurodegenerative diseases.
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Affiliation(s)
- Hei-Jen Huang
- Department of Nursing, Mackay Medicine, Nursing and Management College, Taipei, Taiwan
| | - Yen-Hsu Chen
- Department of Life Science, National Taiwan Normal University, Taipei, Taiwan
| | - Keng-Chen Liang
- Department of Psychology, National Taiwan University, Taipei, Taiwan
| | - Yu-Syuan Jheng
- Department of Nursing, Mackay Medicine, Nursing and Management College, Taipei, Taiwan
| | - Jhih-Jhen Jhao
- Department of Nursing, Mackay Medicine, Nursing and Management College, Taipei, Taiwan
| | - Ming-Tsan Su
- Department of Life Science, National Taiwan Normal University, Taipei, Taiwan
| | - Guey-Jen Lee-Chen
- Department of Life Science, National Taiwan Normal University, Taipei, Taiwan
| | - Hsiu Mei Hsieh-Li
- Department of Life Science, National Taiwan Normal University, Taipei, Taiwan
- * E-mail:
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