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Li Q, Song Z, Peng L, Feng S, Zhan K, Ling H. Dihydromyricetin Improves High Glucose-Induced Dopaminergic Neuronal Damage by Activating AMPK-Autophagy Signaling Pathway. Exp Clin Endocrinol Diabetes 2024. [PMID: 39168148 DOI: 10.1055/a-2399-1174] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 08/23/2024]
Abstract
INTRODUCTION In recent years, a growing number of clinical and biological studies have shown that patients with type 2 diabetes mellitus (T2DM) are at increased risk of developing Parkinson's disease (PD). Prolonged exposure to hyperglycemia results in abnormal glucose metabolism, which in turn causes pathological changes similar to PD, leading to selective loss of dopaminergic neurons in the compact part of the substantia nigra. Dihydromyricetin (DHM) is a naturally occurring flavonoid with various biological activities including antioxidant and hepatoprotective properties. In this study, the effect of DHM on high glucose-induced dopaminergic neuronal damage was investigated. METHODS The potential modulatory effects of DHM on high glucose-induced dopaminergic neuronal damage and its mechanism were studied. RESULTS DHM ameliorated high glucose-induced dopaminergic neuronal damage and autophagy injury. Inhibition of autophagy by 3-methyladenine abrogated the beneficial effects of DHM on high glucose-induced dopaminergic neuronal damage. In addition, DHM increased levels of p-AMP-activated protein kinase (AMPK) and phosphorylated UNC51-like kinase 1. The AMPK inhibitor compound C eliminated DHM-induced autophagy and subsequently inhibited the ameliorative effects of DHM on high glucose-induced dopaminergic neuronal damage. DISCUSSION DHM ameliorates high glucose-induced dopaminergic neuronal damage by activating the AMPK-autophagy pathway.
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Affiliation(s)
- Qi Li
- Department of Physiology, University of South China Hengyang Medical School, Hengyang, China
- Department of Pathology, Yuebei People's Hospital Affiliated to Shantou University School of Medicine, Shaoguan, China
| | - Zhenjiang Song
- Department of Physiology, University of South China Hengyang Medical School, Hengyang, China
| | - Liting Peng
- Department of Physiology, University of South China Hengyang Medical School, Hengyang, China
| | - Shuidong Feng
- Department of Social Medicine and Health Management, University of South China Hengyang Medical School, Hengyang, China
| | - Kebin Zhan
- Department of Neurology, The Second Affiliated Hospital, University of South China Hengyang Medical School, Hengyang, China
| | - Hongyan Ling
- Department of Physiology, University of South China Hengyang Medical School, Hengyang, China
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Zhang W, Yan Y, Yi C, Jiang X, Guo L, Huang S, Xia T, Huang F, Jiao Y, Li H, Yu B, Dai Y. Targeting ferroptosis in the neurovascular unit: A promising approach for treating diabetic cognitive impairment. Int Immunopharmacol 2024; 142:113146. [PMID: 39298819 DOI: 10.1016/j.intimp.2024.113146] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/02/2024] [Revised: 08/12/2024] [Accepted: 09/08/2024] [Indexed: 09/22/2024]
Abstract
The cognitive decline associated with chronic metabolic disease diabetes has garnered extensive scrutiny, yet its pathogenesis remains incompletely understood, and the advancement of targeted therapeutics has posed a persistent challenge. Ferroptosis, a novel form of cell death characterized by intracellular lipid peroxidation and iron overload, has recently emerged as a significant factor. Numerous contemporary studies have corroborated that ferroptosis within the neurovascular unit is intimately associated with the onset of diabetes-induced cognitive impairment. Numerous contemporary studies have corroborated that ferroptosis within the neurovascular unit is intimately associated with the onset of diabetic cognitive impairment (DCI). This article initially conducts a profound analysis of the mechanism of ferroptosis, followed by a detailed elucidation of the specific manifestations of neurovascular unit ferroptosis in the context of diabetic cognitive function impairment. Furthermore, an exhaustive review of pertinent literature from April 2020 to March 2024 has been undertaken, resulting in the selection of 31 documents of significant reference value. These documents encompass studies on 11 distinct drugs, all of which are centered around investigating methods to inhibit the ferroptosis pathway as a potential treatment for DCI. Simultaneously, we conducted a review of 12 supplementary literary sources that presented 10 pharmacological agents with anti-ferroptosis properties in other neurodegenerative disorders. This article critically examines the potential influence of neurovascular unit ferroptosis on the progression of cognitive impairment in diabetes, from the three aforementioned perspectives, and organizes the existing and potential therapeutic drugs. It is our aspiration that this article will serve as a theoretical foundation for scholars in related disciplines when conceptualizing, investigating, and developing novel clinical drugs for DCI.
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Affiliation(s)
- Wenlan Zhang
- School of Integrative Medicine, Tianjin University of Traditional Chinese Medicine, Tianjin 301617, China
| | - Yijing Yan
- School of Traditional Chinese Medicine, Tianjin University of Traditional Chinese Medicine, Tianjin 301617, China
| | - Chunmei Yi
- School of Integrative Medicine, Tianjin University of Traditional Chinese Medicine, Tianjin 301617, China
| | - Xijuan Jiang
- School of Integrative Medicine, Tianjin University of Traditional Chinese Medicine, Tianjin 301617, China
| | - Lin Guo
- School of Integrative Medicine, Tianjin University of Traditional Chinese Medicine, Tianjin 301617, China
| | - Shanshan Huang
- School of Integrative Medicine, Tianjin University of Traditional Chinese Medicine, Tianjin 301617, China
| | - Tong Xia
- School of Integrative Medicine, Tianjin University of Traditional Chinese Medicine, Tianjin 301617, China
| | - Fayin Huang
- School of Traditional Chinese Medicine, Tianjin University of Traditional Chinese Medicine, Tianjin 301617, China
| | - Yike Jiao
- School of Acupuncture & Moxibustion and Tuina, Tianjin University of Traditional Chinese Medicine, Tianjin 301617, China
| | - Huhu Li
- School of Integrative Medicine, Tianjin University of Traditional Chinese Medicine, Tianjin 301617, China.
| | - Bin Yu
- School of Medical Technology, Tianjin University of Traditional Chinese Medicine, Tianjin 301617, China.
| | - Yongna Dai
- School of Traditional Chinese Medicine, Tianjin University of Traditional Chinese Medicine, Tianjin 301617, China.
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Liang F, Tian X, Ding L. Daphnetin modulates GLP-1R to alleviate cognitive dysfunction in diabetes: implications for inflammation and oxidative stress. Front Pharmacol 2024; 15:1438926. [PMID: 39257395 PMCID: PMC11384579 DOI: 10.3389/fphar.2024.1438926] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/27/2024] [Accepted: 08/14/2024] [Indexed: 09/12/2024] Open
Abstract
Daphnetin exerts certain pharmacological function on a variety of diseases, but its role in diabetic cognitive dysfunction has not been elucidated. In this study, we carried a series of pharmacological studies of GLP-1R with daphnetin. In rats and PC12 cells, we found that daphnetin could alleviate diabetic cognitive dysfunction and increase the expression level of GLP-1R. Additionally, the anti-diabetic cognitive dysfunction effect of DAP was accompanied by the inhibition of inflammation and oxidative stress. Further in-depth studies demonstrated that the inhibition GLP-1R enhanced the protective effect of daphnetin, whilst, the overexpression of GLP-1R weakened the protective effect of daphnetin. These results indicated that daphnetin protects diabetes cognitive dysfunction by regulating GLP-1R-mediated inflammation and oxidative stress, act as a GLP-1R agonist. The study further demonstrated that daphnetin has great value in preventing cognitive dysfunction in type 2 diabetes, and GLP-1R is a key potential target for the treatment of related diseases.
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Affiliation(s)
- Feng Liang
- Department of Clinical Laboratory, Key Laboratory of Clinical Laboratory Diagnosis and Translational Research of Zhejiang Province Wenzhou, The First Affiliated Hospital of Wenzhou Medical University, Zhejiang, China
| | - Xinyi Tian
- College of Chemistry and Pharmacy, Northwest A&F University, Xianyang, China
| | - Lining Ding
- College of Chemistry and Pharmacy, Northwest A&F University, Xianyang, China
- Guangdong Pharmaceutical University, Guangzhou, China
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4
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Zeng T, Song Y, Qi S, Zhang R, Xu L, Xiao P. A comprehensive review of vine tea: Origin, research on Materia Medica, phytochemistry and pharmacology. JOURNAL OF ETHNOPHARMACOLOGY 2023; 317:116788. [PMID: 37343650 DOI: 10.1016/j.jep.2023.116788] [Citation(s) in RCA: 4] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/01/2023] [Revised: 05/24/2023] [Accepted: 06/13/2023] [Indexed: 06/23/2023]
Abstract
ETHNOPHARMACOLOGICAL RELEVANCE Vine tea is a popular folk tea that has been consumed in China for more than 1200 years. It is often used in ethnic medicine by ethnic groups in southwest China with at least 35 aliases in 10 provinces. In coastal areas, vine tea is mostly used to treat heatstroke, aphtha, aphonia, toothache, etc. In contrast, in the southwest inland regions, vine tea is mostly used to clear away heat and toxic materials, antiphlogosis and relieving sore-throat, lowering blood pressure and lipid levels, and alleviating fatigue. Three main species have been used as the source of vine tea, Nekemias grossedentata, Nekemias cantonensis and Nekemias megalophylla. Among them, the leaves of Nekemias grossedentata were considered as new food resource in complicance with regulations, according to the Food Safety Standards published by the Monitoring and Evaluation Department of the National Health and Family Planning Commission in China. AIM OF THE STUDY At present, the comprehensively summary of Materia Medica on the history and source of vine tea is currently unavailable. The current article summed up the Materia Medica, species origin and pharmacological effects of all 3 major species used in vine tea to fill the knowledge gaps. We also aim to provide a reference for future research on historical textual, resource development and medicinal utilization of vine tea. MATERIALS AND METHODS Adhering to the literature screening methodology outlined by the Preferred Reporting Items for Systematic Reviews and Meta-Analyses (PRISMA), this review encompasses 148 scholarly research papers from three database, paper ancient books, local chronicles and folklore through field investigations. We then comprehensively summarized and discussed research progresses in scientific and application studies of vine tea. RESULTS The historical records indicated that vine tea could have been used as early as Southern and Northern Dynasties (AC 420-589). Nekemias grossedentata, Nekemias cantonensis and Nekemias megalophylla, were used to considered as vine tea in the ethnic medicine. The main phytochemicals found in three plants are flavonoids, polyphenols and terpenoids, among which dihydromyricetin (DHM) is the most important and most studied active substance. The key words "Ampelopsis grossedentata" (Synonym of Nekemias grossedentata) and "dihydromyricetin/DHM" showed the highest frequency over the last 27 year based on the research trend analysis. And the ethnopharmacology studies drawn the main activities of vine tea are antioxidant, antibacterial, hepatoprotective, neuroprotective and anti-atherosclerosis activities. CONCLUSIONS This review systematically summarized and discussed vine tea from the following five aspects, history, genetic relationship, phytochemistry, research trend and ethnopharmacology. Vine tea has a long historical usage in Chinese ethnic medicine. Its outstanding therapeutic efficacies have attracted extensive attention in other places in the world at present. Nekemias cantonensis and Nekemias megalophylla are quite similar to Nekemias grossedentata in terms of many aspects. However, the current research has a narrow focus on mainly Nekemias grossedentata and DHM. We propose that future studies could be carried out to determine the synergistic effect of multi-components and multi-targets of vine tea including all 3 species to provide valuable knowledge.
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Affiliation(s)
- Tiexin Zeng
- Institute of Medicinal Plant Development, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing, 100193, China; Key Laboratory of Bioactive Substances and Resources Utilization of Chinese Herbal Medicine, Ministry of Education, Beijing, 100193, China.
| | - Yanjun Song
- Institute of Medicinal Plant Development, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing, 100193, China; Key Laboratory of Bioactive Substances and Resources Utilization of Chinese Herbal Medicine, Ministry of Education, Beijing, 100193, China.
| | - Shunyao Qi
- Institute of Medicinal Plant Development, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing, 100193, China; Key Laboratory of Bioactive Substances and Resources Utilization of Chinese Herbal Medicine, Ministry of Education, Beijing, 100193, China.
| | - Ruyue Zhang
- Institute of Medicinal Plant Development, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing, 100193, China; Key Laboratory of Bioactive Substances and Resources Utilization of Chinese Herbal Medicine, Ministry of Education, Beijing, 100193, China.
| | - Lijia Xu
- Institute of Medicinal Plant Development, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing, 100193, China; Key Laboratory of Bioactive Substances and Resources Utilization of Chinese Herbal Medicine, Ministry of Education, Beijing, 100193, China.
| | - Peigen Xiao
- Institute of Medicinal Plant Development, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing, 100193, China; Key Laboratory of Bioactive Substances and Resources Utilization of Chinese Herbal Medicine, Ministry of Education, Beijing, 100193, China.
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Horvat A, Vlašić I, Štefulj J, Oršolić N, Jazvinšćak Jembrek M. Flavonols as a Potential Pharmacological Intervention for Alleviating Cognitive Decline in Diabetes: Evidence from Preclinical Studies. Life (Basel) 2023; 13:2291. [PMID: 38137892 PMCID: PMC10744738 DOI: 10.3390/life13122291] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/30/2023] [Revised: 11/15/2023] [Accepted: 11/24/2023] [Indexed: 12/24/2023] Open
Abstract
Diabetes mellitus is a complex metabolic disease associated with reduced synaptic plasticity, atrophy of the hippocampus, and cognitive decline. Cognitive impairment results from several pathological mechanisms, including increased levels of advanced glycation end products (AGEs) and their receptors, prolonged oxidative stress and impaired activity of endogenous mechanisms of antioxidant defense, neuroinflammation driven by the nuclear factor kappa-light-chain enhancer of activated B cells (NF-κB), decreased expression of brain-derived neurotrophic factor (BDNF), and disturbance of signaling pathways involved in neuronal survival and cognitive functioning. There is increasing evidence that dietary interventions can reduce the risk of various diabetic complications. In this context, flavonols, a highly abundant class of flavonoids in the human diet, are appreciated as a potential pharmacological intervention against cognitive decline in diabetes. In preclinical studies, flavonols have shown neuroprotective, antioxidative, anti-inflammatory, and memory-enhancing properties based on their ability to regulate glucose levels, attenuate oxidative stress and inflammation, promote the expression of neurotrophic factors, and regulate signaling pathways. The present review gives an overview of the molecular mechanisms involved in diabetes-induced cognitive dysfunctions and the results of preclinical studies showing that flavonols have the ability to alleviate cognitive impairment. Although the results from animal studies are promising, clinical and epidemiological studies are still needed to advance our knowledge on the potential of flavonols to improve cognitive decline in diabetic patients.
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Affiliation(s)
- Anđela Horvat
- Division of Molecular Medicine, Ruđer Bošković Institute, Bijenička 54, 10000 Zagreb, Croatia
| | - Ignacija Vlašić
- Division of Molecular Medicine, Ruđer Bošković Institute, Bijenička 54, 10000 Zagreb, Croatia
| | - Jasminka Štefulj
- Division of Molecular Biology, Ruđer Bošković Institute, Bijenička 54, 10000 Zagreb, Croatia
- Department of Psychology, Catholic University of Croatia, Ilica 242, 10000 Zagreb, Croatia
| | - Nada Oršolić
- Division of Animal Physiology, Faculty of Science, University of Zagreb, Rooseveltov trg 6, 10000 Zagreb, Croatia
| | - Maja Jazvinšćak Jembrek
- Division of Molecular Medicine, Ruđer Bošković Institute, Bijenička 54, 10000 Zagreb, Croatia
- Department of Psychology, Catholic University of Croatia, Ilica 242, 10000 Zagreb, Croatia
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6
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Wang Z, Cao Z, Yue Z, Yang Z. Research progress of dihydromyricetin in the treatment of diabetes mellitus. Front Endocrinol (Lausanne) 2023; 14:1216907. [PMID: 37732125 PMCID: PMC10507363 DOI: 10.3389/fendo.2023.1216907] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/10/2023] [Accepted: 08/18/2023] [Indexed: 09/22/2023] Open
Abstract
Diabetic Mellitus (DM), a chronic metabolic disorder disease characterized by hyperglycemia, is mainly caused by the absolute or relative deficiency of insulin secretion or decreased insulin sensitivity in target tissue cells. Dihydromyricetin (DMY) is a flavonoid compound of dihydroflavonol that widely exists in Ampelopsis grossedentata. This review aims to summarize the research progress of DMY in the treatment of DM. A detailed summary of related signaling induced by DMY are discussed. Increasing evidence implicates that DMY display hypoglycemic effects in DM via improving glucose and lipid metabolism, attenuating inflammatory responses, and reducing oxidative stress, with the signal transduction pathways underlying the regulation of AMPK or mTOR/autophagy, and relevant downstream cascades, including PGC-1α/SIRT3, MEK/ERK, and PI3K/Akt signal pathways. Hence, the mechanisms underlying the therapeutic implications of DMY in DM are still obscure. In this review, following with a brief introduction of the absorption, metabolism, distribution, and excretion characteristics of DMY, we summarized the current pharmacological developments of DMY as well as possible molecular mechanisms in the treatment of DM, aiming to push the understanding about the protective role of DMY as well as its preclinical assessment of novel application.
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Affiliation(s)
| | | | | | - Zhengfeng Yang
- Precision Research Center for Refractory Diseases, Shanghai General Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, China
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7
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Wang Z, Feng S, Li Q, Song Z, He J, Yang S, Yan C, Ling H. Dihydromyricetin alleviates hippocampal ferroptosis in type 2 diabetic cognitive impairment rats via inhibiting the JNK-inflammatory factor pathway. Neurosci Lett 2023; 812:137404. [PMID: 37482219 DOI: 10.1016/j.neulet.2023.137404] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/25/2023] [Revised: 07/15/2023] [Accepted: 07/18/2023] [Indexed: 07/25/2023]
Abstract
Type 2 diabetes mellitus (T2DM) is frequently associated with diabetic cognitive impairment (DCI), and recent studies have shown a strong association between DCI and hippocampal ferroptosis. In this study, we administered dihydromyricetin (DHM) or JNK inhibitor SP600125, to T2DM rats and monitored changes in blood glucose levels, conducted behavioral tests, and detected changes in JNK, inflammatory factors and ferroptosis-related indicators. Our findings demonstrated that T2DM rats displayed signs of cognitive impairment (CI), with ferrozine assays indicating elevated iron content in the hippocampus. Concurrently, there was an increase in p-JNK activity and inflammatory factors IL-6 and TNF-α in the hippocampal region of these rats. Furthermore, we observed elevated levels of Fe2+, MDA, ROS, LPO, and ACSL4, along with a decrease in GPX4 and GSH, suggesting the occurrence of hippocampal ferroptosis. SP600125 application reversed these changes in the T2DM rats, although it exhibited no significant effects in the control group. Treatment with high and low doses of DHM led to a reduction in p-JNK expression, inflammatory factor-related proteins, and iron accumulation in the hippocampal region, effectively alleviating hippocampal ferroptosis in T2DM rats. No notable effects of DHM were observed in the control group. To conclude, our study suggests that DHM can potentially alleviate hippocampal ferroptosis of T2DM cognitive impairment rats, primarily by suppressing the JNK-inflammatory factor pathway in the hippocampus.
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Affiliation(s)
- Zihan Wang
- Department of Physiology, Hengyang Medical School, University of South China, Hengyang 421001, Hunan, China; School of Medicine, The Chinese University of Hong Kong, Shenzhen 518172, Guangdong, China
| | - Shuidong Feng
- Department of Social Medicine and Health Service Management, School of Public Health, University of South China, Hengyang 421001, Hunan, China
| | - Qi Li
- Department of Physiology, Hengyang Medical School, University of South China, Hengyang 421001, Hunan, China
| | - Zhenjiang Song
- Department of Physiology, Hengyang Medical School, University of South China, Hengyang 421001, Hunan, China
| | - Jianqin He
- Department of Physiology, Hengyang Medical School, University of South China, Hengyang 421001, Hunan, China
| | - Sisi Yang
- Department of Physiology, Hengyang Medical School, University of South China, Hengyang 421001, Hunan, China
| | - Canqun Yan
- The Health Management Center, The Second Affiliated Hospital, Hengyang Medical School, University of South China, Hengyang 421001, Hunan, China
| | - Hongyan Ling
- Department of Physiology, Hengyang Medical School, University of South China, Hengyang 421001, Hunan, China.
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McCarthy E, Dunn J, Augustine K, Connaughton VP. Prolonged Hyperglycemia Causes Visual and Cognitive Deficits in Danio rerio. Int J Mol Sci 2022; 23:10167. [PMID: 36077569 PMCID: PMC9456228 DOI: 10.3390/ijms231710167] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/29/2022] [Revised: 08/30/2022] [Accepted: 09/01/2022] [Indexed: 11/18/2022] Open
Abstract
The present study induced prolonged hyperglycemia (a hallmark symptom of Type 2 diabetes [T2DM]) in Danio rerio (zebrafish) for eight or twelve weeks. The goal of this research was to study cognitive decline as well as vision loss in hyperglycemic zebrafish. Fish were submerged in glucose for eight or twelve weeks, after which they were assessed with both a cognitive assay (three-chamber choice) and a visual assay (optomotor response (OMR)). Zebrafish were also studied during recovery from hyperglycemia. Here, fish were removed from the hyperglycemic environment for 4 weeks after either 4 or 8 weeks in glucose, and cognition and vision was again assessed. The 8- and 12-week cognitive results revealed that water-treated fish showed evidence of learning while glucose- and mannitol-treated fish did not within the three-day testing period. OMR results identified an osmotic effect with glucose-treated fish having significantly fewer positive rotations than water-treated fish but comparable rotations to mannitol-treated fish. The 8- and 12-week recovery results showed that 4 weeks was not enough time to fully recovery from the hyperglycemic insult sustained.
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Dutta BJ, Singh S, Seksaria S, Das Gupta G, Singh A. Inside the diabetic brain: Insulin resistance and molecular mechanism associated with cognitive impairment and its possible therapeutic strategies. Pharmacol Res 2022; 182:106358. [PMID: 35863719 DOI: 10.1016/j.phrs.2022.106358] [Citation(s) in RCA: 22] [Impact Index Per Article: 11.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/08/2022] [Revised: 07/02/2022] [Accepted: 07/15/2022] [Indexed: 01/21/2023]
Abstract
Type 2 diabetes mellitus (T2DM) the most prevalent metabolic disease that has evolved into a major public health issue. Concerning about its secondary complications, a growing body of evidence links T2DM to cognitive impairment and neurodegenerative disorders. The underlying pathology behind this secondary complication disease is yet to be fully known. Nonetheless, they are likely to be associated with poor insulin signaling as a result of insulin resistance. We have combed through a rising body of literature on insulin signaling in the normal and diabetic brains along with various factors like insulin resistance, hyperglycemia, obesity, oxidative stress, neuroinflammation and Aβ plaques which can act independently or synergistically to link T2DM with cognitive impairments. Finally, we explored several pharmacological and non-pharmacological methods in the hopes of accelerating the rational development of medications for cognitive impairment in T2DM by better understanding these shared pathways.
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Affiliation(s)
- Bhaskar Jyoti Dutta
- Department of Pharmacology, ISF College of Pharmacy, GT Road, Ghal Kalan, Moga 142001, Punjab, India
| | - Shamsher Singh
- Department of Pharmacology, ISF College of Pharmacy, GT Road, Ghal Kalan, Moga 142001, Punjab, India
| | - Sanket Seksaria
- Department of Pharmacology, ISF College of Pharmacy, GT Road, Ghal Kalan, Moga 142001, Punjab, India
| | - Ghanshyam Das Gupta
- Department of Pharmacology, ISF College of Pharmacy, GT Road, Ghal Kalan, Moga 142001, Punjab, India
| | - Amrita Singh
- Department of Pharmacology, ISF College of Pharmacy, GT Road, Ghal Kalan, Moga 142001, Punjab, India.
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Tetramethylpyrazine Attenuates Cognitive Impairment Via Suppressing Oxidative Stress, Neuroinflammation, and Apoptosis in Type 2 Diabetic Rats. Neurochem Res 2022; 47:2431-2444. [PMID: 35665448 DOI: 10.1007/s11064-022-03640-x] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/12/2022] [Revised: 05/14/2022] [Accepted: 05/17/2022] [Indexed: 10/18/2022]
Abstract
Cognitive dysfunction is an important complication observed in type 2 diabetes mellitus (T2DM) patients. Tetramethylpyrazine (TMP) is known to exhibit anti-diabetic and neuroprotective properties. Therefore, the present study aimed to investigate the possible therapeutic effects of TMP against type 2 diabetes-associated cognitive impairment in rats. High-fat diet (HFD) followed by a low dose of streptozotocin (35 mg/kg) was used to induce diabetes in Sprague-Dawley rats. TMP (20, 40, and 80 mg/kg) and Pioglitazone (10 mg/kg) were administered for 4 weeks. The Morris water maze (MWM) and novel objective recognition task (NOR) tests were used to assess memory function. Fasting blood glucose (FBG), lipid profile, HOMA-IR, glycosylated hemoglobin (HbA1c), and glucose tolerance were measured. Acetylcholinesterase (AChE) and choline acetytransferase (ChAT) activity, acetylcholine (ACh) levels, oxidative stress, apoptotic (Bcl-2, Bax, caspase-3), and inflammatory markers (TNF-α, IL-1β, and NF-kβ) were assessed. BDNF, p-AKT, and p-CREB levels were also measured. In the present work, we observed that treatment of diabetic rats with TMP alleviated learning and memory deficits, improved insulin sensitivity, and attenuated hyperglycemia and dyslipidemia. Furthermore, treatment with TMP increased BDNF, p-Akt, and p-CREB levels, normalized cholinergic dysfunction, and suppressed oxidative, inflammatory, and apoptotic markers in the hippocampus. Collectively, our results suggest that the TMP may be an effective neuroprotective agent in alleviating type 2 diabetes-associated cognitive deficits.
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11
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Zhou X, Song Y, Zeng C, Zhang H, Lv C, Shi M, Qin S. Molecular Mechanism Underlying the Regulatory Effect of Vine Tea on Metabolic Syndrome by Targeting Redox Balance and Gut Microbiota. Front Nutr 2022; 9:802015. [PMID: 35252293 PMCID: PMC8891217 DOI: 10.3389/fnut.2022.802015] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/26/2021] [Accepted: 01/17/2022] [Indexed: 11/13/2022] Open
Abstract
Metabolic syndrome (MS) is a metabolic disorder that arises from the increasing prevalence of obesity. The pathophysiology seems to be largely attributable to the imbalance of lipid and glucose metabolism, redox signaling pathways, and gut microbiota. The increased syndromes, such as type 2 diabetes and cardiovascular disease demands natural therapeutic attention for those at high risk. Vine tea, as a traditional medicinal and edible resource rich in flavonoids, especially for dihydromyricetin (DHM), exhibits promising health benefits on the intervention of MS, but the specific molecular mechanism has not been systematically elucidated. The present article aims to summarize the regulatory effects and biological targets of vine tea or DHM on MS, and analyze the underlying potential molecular mechanisms in cells, animals, and humans, mainly by regulating the redox associated signaling pathways, such as Nrf2, NF-κB, PI3K/IRS2/AKT, AMPK-PGC1α-SIRT1, SIRT3 pathways, and the crosstalk among them, and by targeting several key biomarkers. Moreover, vine tea extract or DHM has a positive impact on the modulation of intestinal microecology by upregulating the ratio of Firmicutes/Bacteroidetes (F/B) and increasing the relative abundance of Akkermansia muciniphila. Therefore, this review updated the latest important theoretical basis and molecular evidence for the development and application of vine tea in dietary functional products or drugs against MS and also imputed the future perspectives to clarify the deep mechanism among vine tea or DHM, redox associated signaling pathways, and gut microbiota.
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Affiliation(s)
- Xixin Zhou
- Department of Biological Sciences, College of Bioscience and Biotechnology, Hunan Agricultural University, Changsha, China
| | - Ying Song
- Department of Biological Sciences, College of Bioscience and Biotechnology, Hunan Agricultural University, Changsha, China
| | - Chaoxi Zeng
- Lab of Food Function and Nutrigenomics, College of Food Science and Technology, Hunan Agricultural University, Changsha, China
| | - Haowei Zhang
- Lab of Food Function and Nutrigenomics, College of Food Science and Technology, Hunan Agricultural University, Changsha, China
| | - Chenghao Lv
- Department of Biological Sciences, College of Bioscience and Biotechnology, Hunan Agricultural University, Changsha, China
- Lab of Food Function and Nutrigenomics, College of Food Science and Technology, Hunan Agricultural University, Changsha, China
| | - Meng Shi
- Lab of Food Function and Nutrigenomics, College of Food Science and Technology, Hunan Agricultural University, Changsha, China
- *Correspondence: Meng Shi
| | - Si Qin
- Department of Biological Sciences, College of Bioscience and Biotechnology, Hunan Agricultural University, Changsha, China
- Lab of Food Function and Nutrigenomics, College of Food Science and Technology, Hunan Agricultural University, Changsha, China
- Si Qin
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Sun CC, Yin ZP, Chen JG, Wang WJ, Zheng GD, Li JE, Chen LL, Zhang QF. Dihydromyricetin Improves Cognitive Impairments in d-Galactose-Induced Aging Mice through Regulating Oxidative Stress and Inhibition of Acetylcholinesterase. Mol Nutr Food Res 2022; 66:e2101002. [PMID: 34932880 DOI: 10.1002/mnfr.202101002] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/03/2021] [Revised: 12/02/2021] [Indexed: 02/05/2023]
Abstract
SCOPE Alzheimer's disease (AD) is a neurodegenerative disease with phenomena of cognitive impairments. Oxidative stress and cholinergic system dysfunction are two widely studied pathogenesis of AD. Dihydromyricetin (DMY) is a natural dihydroflavonol with many bioactivities. In this study, it is aimed to investigate the effects of DMY on cognitive impairment in d-galactose (d-gal) induced aging mice. METHODS AND RESULTS Mice are intraperitoneally injected with d-gal for 16 weeks, and DMY is supplemented in drinking water. The results show that DMY significantly improves d-gal-induced cognitive impairments in novel object recognition and Y-maze studies. H&E and TUNEL staining show that DMY could improve histopathological changes and cell apoptosis in mice brain. DMY effectively induces the activities of catalase, superoxide dismutase and glutathione peroxidase, and reduces malondialdehyde level in mice brain and liver. Furthermore, DMY reduces cholinergic injury by inhibiting the activity of Acetylcholinesterase (AChE) in mice brain. In vitro studies show that DMY is a non-competitive inhibitor of AChE with IC50 value of 161.2 µg mL-1 . CONCLUSION DMY alleviates the cognitive impairments in d-gal-induced aging mice partly through regulating oxidative stress and inhibition of acetylcholinesterase.
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Affiliation(s)
- Cui-Cui Sun
- Jiangxi Key Laboratory of Natural Product and Functional Food, College of Food Science and Engineering, Jiangxi Agricultural University, Nanchang, 330045, China
| | - Zhong-Ping Yin
- Jiangxi Key Laboratory of Natural Product and Functional Food, College of Food Science and Engineering, Jiangxi Agricultural University, Nanchang, 330045, China
| | - Ji-Guang Chen
- Jiangxi Key Laboratory of Natural Product and Functional Food, College of Food Science and Engineering, Jiangxi Agricultural University, Nanchang, 330045, China
| | - Wen-Jun Wang
- Jiangxi Key Laboratory of Natural Product and Functional Food, College of Food Science and Engineering, Jiangxi Agricultural University, Nanchang, 330045, China
| | - Guo-Dong Zheng
- Jiangxi Key Laboratory of Natural Product and Functional Food, College of Food Science and Engineering, Jiangxi Agricultural University, Nanchang, 330045, China
| | - Jing-En Li
- Jiangxi Key Laboratory of Natural Product and Functional Food, College of Food Science and Engineering, Jiangxi Agricultural University, Nanchang, 330045, China
| | - Ling-Li Chen
- Jiangxi Key Laboratory of Natural Product and Functional Food, College of Food Science and Engineering, Jiangxi Agricultural University, Nanchang, 330045, China
| | - Qing-Feng Zhang
- Jiangxi Key Laboratory of Natural Product and Functional Food, College of Food Science and Engineering, Jiangxi Agricultural University, Nanchang, 330045, China
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Feng J, Zhou Y, Liao L, Yu L, Yuan P, Zhang J. Network Pharmacology and Transcriptomics Reveal the Mechanism of GuaLouQuMaiWan in Treatment of Type 2 Diabetes and Its Active Small Molecular Compound. J Diabetes Res 2022; 2022:2736504. [PMID: 36248223 PMCID: PMC9560855 DOI: 10.1155/2022/2736504] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/08/2022] [Revised: 06/18/2022] [Accepted: 09/14/2022] [Indexed: 11/17/2022] Open
Abstract
The main pathophysiological abnormalities in type 2 diabetes (T2D) include pancreatic β-cell dysfunction and insulin resistance. Due to hyperglycemia, patients receive long-term treatment. However, side effects and drug tolerance usually lead to treatment failure. GuaLouQuMaiWan (GLQMW), a common traditional Chinese medicine (TCM) prescription, has positive effects on controlling blood sugar and improving quality of life, but the mechanism is still unclear. To decipher their molecular mechanisms, we used a novel computational systems pharmacology-based approach consisting of bioinformatics analysis, network pharmacology, and drug similarity comparison. We divided the participants into nondisease (ND), impaired glucose tolerance (IGT), and type 2 diabetes groups according to the WHO's recommendations for diabetes. By analyzing the gene expression profile of the ND-IGT-T2D (ND to IGT to T2D) process, we found that the function of downregulated genes in the whole process was mainly related to insulin secretion, while the upregulated genes were related to inflammation. Furthermore, other genes in the ND-IGT (ND to IGT) process are mainly related to inflammation and lipid metabolic disorders. We speculate that 17 genes with a consistent trend may play a key role in the process of ND-IGT-T2D. We further performed target prediction for 50 compounds in GLQMW that met the screening criteria and intersected the differentially expressed genes of the T2D process with the compounds of GLQMW; a total of 18 proteins proved potential targets for GLQMW. Among these, RBP4 is considerably related to insulin resistance. GO/KEGG enrichment analyses of the target genes of GLQMW showed enrichment in inflammation- and T2D therapy-related pathways. Based on the RDKit tool and the DrugBank database, we speculate that (-)-taxifolin, dialoside A_qt, spinasterol, isofucosterol, and 11,14-eicosadienoic acid can be used as potential drugs for T2D via molecular docking and drug similarity comparison.
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Affiliation(s)
- Jiahao Feng
- Scientific Research Center, The Seventh Affiliated Hospital of Sun Yat-sen University, Shenzhen, China 518000
| | - Yuheng Zhou
- Department of Thoracic Oncology, Sun Yat-sen University Cancer Center, Guangzhou, China 510632
| | - Li Liao
- Chongqing Jiangjin District Hospital of Chinese Medicine, Chongqing, China 404100
| | - Liping Yu
- Shenzhen Hospital of Traditional Chinese Medicine, Shenzhen, China 518000
| | - Ping Yuan
- Tongren Hospital Shanghai Jiao Tong University, Shanghai, China 200000
| | - Jun Zhang
- School of Traditional Medicine, Jinan University, Guangzhou, China 510632
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14
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Cheng L, Wang X, Ma X, Xu H, Yang Y, Zhang D. Effect of dihydromyricetin on hepatic encephalopathy associated with acute hepatic failure in mice. PHARMACEUTICAL BIOLOGY 2021; 59:557-564. [PMID: 33982639 PMCID: PMC8128201 DOI: 10.1080/13880209.2021.1917625] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/13/2023]
Abstract
CONTEXT Hepatic encephalopathy (HE) is a complex neuropsychiatric disease caused by liver failure. Dihydromyricetin (DMY) is a traditional medicine used to treat liver injury. OBJECTIVE To investigate the effects of dihydromyricetin (DMY) on hepatic encephalopathy associated with acute hepatic failure mice models established by thioacetamide (TAA) exposure. MATERIALS AND METHODS Female BALB/c mouse were randomly divided into control, DMY, TAA, and TAA + DMY groups (n = 8). The first two groups were intraperitoneally injected with saline or 5 mg/kg DMY, respectively. The last two groups were injected with 600 mg/kg TAA to establish HE models, and then the mice in the last group were treated with 5 mg/kg DMY. Neurological and cognition functions were evaluated 24 and 48 h after injection. Mice were sacrificed after which livers and brains were obtained for immunoblot and histopathological analysis, while blood was collected for the analysis of liver enzymes. RESULTS In the TAA + DMY group, ALT and AST decreased to 145.31 ± 12.88 U/L and 309.51 ± 25.92 U/L, respectively, whereas ammonia and TBIL decreased to 415.67 ± 41.91 μmol/L and 3.31 ± 0.35 μmol/L, respectively. Moreover, MDA decreased to 10.74 ± 3.97 nmol/g, while SOD and GST increased to 398.69 ± 231.30 U/g and 41.37 ± 21.84 U/g, respectively. The neurological score decreased to 2.87 ± 0.63, and the number of GFAP-positive cells decreased to 41.10 ± 1.66. Furthermore, the protein levels of TNF-α, IL-6, and GABAA in the cortex decreased. CONCLUSIONS We speculate that DMY can serve as a novel treatment for HE.
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Affiliation(s)
- Long Cheng
- Department of Gastroenterology, Lanzhou University Second Hospital, Lanzhou, People’s Republic of China
| | - Xiaoying Wang
- Department of Gastroenterology, Lanzhou University Second Hospital, Lanzhou, People’s Republic of China
| | - Xueni Ma
- Department of Gastroenterology, Lanzhou University Second Hospital, Lanzhou, People’s Republic of China
| | - Huimei Xu
- Department of Gastroenterology, Lanzhou University Second Hospital, Lanzhou, People’s Republic of China
| | - Yifan Yang
- Department of Gastroenterology, Lanzhou University Second Hospital, Lanzhou, People’s Republic of China
| | - Dekui Zhang
- Department of Gastroenterology, Lanzhou University Second Hospital, Lanzhou, People’s Republic of China
- CONTACT Dekui Zhang Department of Gastroenterology, Lanzhou University Second Hospital, Lanzhou730030, People’s Republic of China
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15
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Tu Y, Li L, Wang Z, Yang L. Advances in analytical techniques and quality control of traditional Chinese medicine injections. J Pharm Biomed Anal 2021; 206:114353. [PMID: 34562802 DOI: 10.1016/j.jpba.2021.114353] [Citation(s) in RCA: 16] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/02/2021] [Revised: 07/27/2021] [Accepted: 08/29/2021] [Indexed: 12/24/2022]
Abstract
Traditional Chinese medicine injections (TCMIs) are a new pharmaceutical form in the modernization of traditional Chinese medicines (TCMs). Its efficacy is rapid, the curative effect is improved, and is widely used in critical and acute diseases, complicated and severe diseases, and other treatment. However, with the broad applications of TCMIs, clinical adverse reactions frequently occur, and safety problems become more prominent. Therefore, the quality control of TCMIs is essential. Chemical analysis methods and biological analysis methods are widely used in the quality control of TCMIs. This article describes the current status of TCMIs, the analytical techniques, and methods currently used, and the quality control of TCMIs. A summary of the advantages and disadvantages of the current analysis methods is presented. An overview of the quality control of TCMIs is introduced. In addition, emerging techniques of the quality control of TCMIs are introduced.
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Affiliation(s)
- Yujia Tu
- The MOE Key Laboratory of Standardization of Chinese Medicines and the SATCM Key Laboratory of New Resources and Quality Evaluation of Chinese Medicines, Institute of Chinese Materia Medica, Shanghai University of Traditional Chinese Medicine, Shanghai 201203, China
| | - Linnan Li
- The MOE Key Laboratory of Standardization of Chinese Medicines and the SATCM Key Laboratory of New Resources and Quality Evaluation of Chinese Medicines, Institute of Chinese Materia Medica, Shanghai University of Traditional Chinese Medicine, Shanghai 201203, China
| | - Zhengtao Wang
- The MOE Key Laboratory of Standardization of Chinese Medicines and the SATCM Key Laboratory of New Resources and Quality Evaluation of Chinese Medicines, Institute of Chinese Materia Medica, Shanghai University of Traditional Chinese Medicine, Shanghai 201203, China; Shanghai R&D Center for Standardization of Chinese Medicines, Shanghai 201203, China
| | - Li Yang
- The MOE Key Laboratory of Standardization of Chinese Medicines and the SATCM Key Laboratory of New Resources and Quality Evaluation of Chinese Medicines, Institute of Chinese Materia Medica, Shanghai University of Traditional Chinese Medicine, Shanghai 201203, China; Shanghai R&D Center for Standardization of Chinese Medicines, Shanghai 201203, China.
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16
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Meng J, Zhu Y, Ma H, Wang X, Zhao Q. The role of traditional Chinese medicine in the treatment of cognitive dysfunction in type 2 diabetes. JOURNAL OF ETHNOPHARMACOLOGY 2021; 280:114464. [PMID: 34329715 DOI: 10.1016/j.jep.2021.114464] [Citation(s) in RCA: 15] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/03/2021] [Revised: 07/04/2021] [Accepted: 07/24/2021] [Indexed: 06/13/2023]
Abstract
ETHNOPHARMACOLOGICAL RELEVANCE Diabetic cognitive dysfunction (DCD) is mainly one of the complications of type 2 diabetes mellitus (T2DM) with complex and obscure pathogenesis. Extensive evidence has demonstrated the effectiveness and safety of traditional Chinese medicine (TCM) for DCD management. AIM OF THE STUDY This review attempted to systematically summarize the possible pathogenesis of DCD and the current Chinese medicine on the treatment of DCD. MATERIALS AND METHODS We acquired information of TCM on DCD treatment from PubMed, Web of Science, Science Direct and CNKI databases. We then dissected the potential mechanisms of currently reported TCMs and their active ingredients for the treatment of DCD by discussing the deficiencies and giving further recommendations. RESULTS Most TCMs and their active ingredients could improve DCD through alleviating insulin resistance, microvascular dysfunction, abnormal gut microbiota composition, inflammation, and the damages of the blood-brain barrier, cerebrovascular and neurons under hyperglycemia conditions. CONCLUSIONS TCM is effective in the treatment of DCD with few adverse reactions. A large number of in vivo and in vitro, and clinical trials are still needed to further reveal the potential quality markers of TCM on DCD treatment.
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Affiliation(s)
- Jinni Meng
- Department of Pharmacology, School of Pharmacy, Ningxia Medical University, Ningxia, China
| | - Yafei Zhu
- College of Basic Medicine, Ningxia Medical University, Ningxia, China
| | - Huixia Ma
- Department of Pharmacology, School of Pharmacy, Ningxia Medical University, Ningxia, China
| | - Xiaobo Wang
- State Key Laboratory of Southwestern Chinese Medicine Resources, Innovative Institute of Chinese Medicine and Pharmacy, Chengdu University of Traditional Chinese Medicine, Chengdu, China.
| | - Qipeng Zhao
- Department of Pharmacology, School of Pharmacy, Ningxia Medical University, Ningxia, China; Key Laboratory of Hui Ethnic Medicine Modernization, Ministry of Education, Ningxia Medical University, Ningxia, China.
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17
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Matinfar P, Peeri M, Azarbayjani MA. Swimming exercise attenuates anxiety-like behavior by reducing brain oxidative stress in type 2 diabetic mice. Physiol Behav 2021; 237:113449. [PMID: 33945802 DOI: 10.1016/j.physbeh.2021.113449] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/04/2020] [Revised: 04/20/2021] [Accepted: 04/29/2021] [Indexed: 11/28/2022]
Abstract
Anxiety-related behaviors are among the most prevalent psychiatric disorders in patients with type 2 diabetes (T2D). The protective effect of exercise on neuropsychiatric disorders has been documented. However, there are no studies that examined whether swimming exercise can decrease anxiety-like symptoms in type 2 diabetes. We investigated the effects of swimming exercise on body weight, anxiety-like behavior, glucose and insulin levels, and brain oxidative stress in male C57BL/6 mice. T2D-induced mice were subjected to swimming exercise, then anxiety-like behaviors were measured by the open field, light-dark box, and elevated plus-maze tests. Glucose and insulin levels were measure in serum, and antioxidant/oxidative markers including glutathione (GSH), malondialdehyde (MDA), and glutathione disulfide (GSSG) were measured in the brain. Our findings showed that T2D increased body weight, anxiety-like symptoms, glucose and insulin resistance, and oxidative stress by increasing MDA and GSSG levels in the brain of mice. Interestingly, swimming exercise reversed these parameters in diabetic mice. Our findings clearly indicate that there is a protective impact of swimming exercise on anxiety-like behavior by reducing insulin resistance and brain oxidative stress in mice with type 2 diabetes. Further studies are needed to validate these findings in humans.
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Affiliation(s)
- Parinaz Matinfar
- Department of Exercise Physiology, Central Tehran Branch, Islamic Azad University, Tehran, Iran
| | - Maghsoud Peeri
- Department of Exercise Physiology, Central Tehran Branch, Islamic Azad University, Tehran, Iran.
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18
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Huang B, Hu X, Hu J, Chen Z, Zhao H. Betaine Alleviates Cognitive Deficits in Diabetic Rats via PI3K/Akt Signaling Pathway Regulation. Dement Geriatr Cogn Disord 2021; 49:270-278. [PMID: 32702702 DOI: 10.1159/000508624] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/30/2020] [Accepted: 05/12/2020] [Indexed: 11/19/2022] Open
Abstract
BACKGROUND Diabetes mellitus is a metabolic disease which also causes cognitive deficits. Betaine (N,N,N-trimethylglycine), also known as trimethylglycine, has been shown to ameliorate diabetic symptoms in diabetic animals and improve cognitive ability in Alzheimer disease (AD) animals. However, the effects of betaine on cognitive deficits in diabetic animals have not been described yet. Therefore, in the current study, the effects of betaine on cognition in diabetic rats were evaluated. METHODS We established a diabetic rat model by injecting streptozotocin (STZ) into rats and administrated betaine to these diabetic rats. We monitored the metabolism index, and glucose and insulin levels in blood and cerebrospinal fluid. We measured inflammatory cytokine levels, including TNF-α, IL-1β, and IL-6, in serum and hippocampus. We also monitored oxidative stress in the hippocampus by measuring malondialdehyde (MDA) level and superoxide dismutase (SOD) activity. We measured the learning and memory ability of diabetic rats using the Morris water and Y maze tests and tested the phosphatidylinositol 3-kinase (PI3K)/Akt activation and p-mTOR level in the hippocampus. RESULTS Betaine improved glucose metabolism and suppressed the production of inflammatory cytokines, including TNF-α, IL-1β, and IL-6. Also, betaine decreased MDA concentration and increased SOD activity in the hippocampus of diabetic rats. Betaine ameliorated cognitive deficits in diabetic rats, and it promoted PI3K expression and Akt activation and decreased p-mTOR expression. CONCLUSION Betaine alleviates cognitive deficits in STZ-induced diabetic rats via regulating the PI3K/Akt signaling pathway.
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Affiliation(s)
- Bingqing Huang
- Department of Clinical Nutrition, Second People's Hospital of Hefei, Anhui Medical University Affiliated Hefei Hospital, Hefei, China,
| | - Xiaoli Hu
- Department of Medical Affairs, Second People's Hospital of Hefei, Anhui Medical University Affiliated Hefei Hospital, Hefei, China
| | - Jie Hu
- Department of Clinical Nutrition, Second People's Hospital of Hefei, Anhui Medical University Affiliated Hefei Hospital, Hefei, China
| | - Zhenfei Chen
- Department of Medical Affairs, Second People's Hospital of Hefei, Anhui Medical University Affiliated Hefei Hospital, Hefei, China
| | - Hao Zhao
- Department of Medical Affairs, Second People's Hospital of Hefei, Anhui Medical University Affiliated Hefei Hospital, Hefei, China
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19
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Cázares-Camacho R, Domínguez-Avila JA, Astiazarán-García H, Montiel-Herrera M, González-Aguilar GA. Neuroprotective effects of mango cv. 'Ataulfo' peel and pulp against oxidative stress in streptozotocin-induced diabetic rats. JOURNAL OF THE SCIENCE OF FOOD AND AGRICULTURE 2021; 101:497-504. [PMID: 32648261 DOI: 10.1002/jsfa.10658] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/04/2020] [Revised: 07/02/2020] [Accepted: 07/10/2020] [Indexed: 06/11/2023]
Abstract
BACKGROUND Oxidative stress has been implicated in the pathogenesis and progression of diabetes mellitus. Both can damage the brain. Mango and its by-products are sources of bioactive compounds with antioxidant properties. We hypothesized that mango cv. 'Ataulfo' peel and pulp mitigate oxidative stress in the brain of streptozotocin-induced diabetic rats. RESULTS Twenty-four male Wistar rats were divided into four groups: control, untreated diabetic (UD), diabetic treated with a mango-supplemented diet (MTD), and diabetic pretreated with a mango-supplemented diet (MPD). The rats were fed the different diets for 4 weeks after diabetes induction (MTD), or 2 weeks before and 4 weeks after induction (MPD). After the intervention, serum and brain (cerebellum and cortex) were collected to evaluate gene expression, enzyme activity, and redox biomarkers. Superoxide dismutase 2 (SOD2) expression increased in the cortex of the MTD group, whereas glutathione-S-transferase p1 (GSTp1) expression was higher in the cortex of the MTD group, and cortex and cerebellum of the MPD group. SOD1 activity was higher in the cerebellum and cortex of all diabetic groups, whereas GST activity increased in the cerebellum and cortex of the MPD group. Lipid peroxidation increased in the cerebellum and cortex of the UD group; however, a mango-supplemented diet prevented this increase in both regions, while also mitigating polyphagia and weight loss, and maintaining stable glycemia in diabetic rats. CONCLUSION We propose that mango exerts potent neuroprotective properties against diabetes-induced oxidative stress. It can be an alternative to prevent and treat biochemical alterations caused by diabetes. © 2020 Society of Chemical Industry.
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Affiliation(s)
- Rosario Cázares-Camacho
- Coordinación de Tecnología de Alimentos de Origen Vegetal, Centro de Investigación en Alimentación y Desarrollo A. C., Hermosillo, Mexico
| | | | - Humberto Astiazarán-García
- Coordinación de Nutrición, Centro de Investigación en Alimentación y Desarrollo A. C., Hermosillo, Mexico
| | | | - Gustavo A González-Aguilar
- Coordinación de Tecnología de Alimentos de Origen Vegetal, Centro de Investigación en Alimentación y Desarrollo A. C., Hermosillo, Mexico
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20
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Lang X, Zhao N, He Q, Li X, Li X, Sun C, Zhang X. Treadmill exercise mitigates neuroinflammation and increases BDNF via activation of SIRT1 signaling in a mouse model of T2DM. Brain Res Bull 2020; 165:30-39. [PMID: 32987101 DOI: 10.1016/j.brainresbull.2020.09.015] [Citation(s) in RCA: 21] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/23/2020] [Revised: 09/16/2020] [Accepted: 09/17/2020] [Indexed: 02/06/2023]
Abstract
Although previous studies showed that exercise can improve cognitive dysfunction in type 2 diabetes (T2DM), the underlying mechanism remains unclear. Sirtuin 1 (SIRT1) has been shown to play a role in regulating inflammatory responses in the brain and increasing BDNF expression. This study investigated the effects of treadmill exercise on the hippocampal inflammatory response and BDNF expression in a T2DM mice model. We also tested whether these effects are SIRT1-dependent. In this study, C57BL/ 6 mice were used to construct T2DM model by a high-fat diet and STZ injection. We found that treadmill exercise for 8 weeks can significantly improve the cognitive dysfunction, alleviate activation of proinflammatory microglia M1 (Iba1 labeling) in the hippocampus of T2DM mice, and reduce the levels of proinflammatory factors IL-1β, IL-6, TNF-α, increase the expression levels of anti-inflammatory factors IL-10, TGF-β1, and promote the release of BDNF. We also found that exercise activate the signaling pathway of SIRT1/ NF-κB and SIRT1/ PGC-1α/ FNDC5/ BDNF. After the application of nicotinamide (NAM, SIRT1 inhibitor), the positive effects of exercise were remarkably suppressed. Our results showed that long-term moderate intensity treadmill exercise can alleviate inflammatory response in the hippocampus and increase BDNF expression in T2DM mice by activating SIRT1.
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Affiliation(s)
| | - Na Zhao
- Key Laboratory of Adolescent Health Assessment and Exercise Intervention of Ministry of Education, East China Normal University, Shanghai, China
| | - Qiang He
- School of Physical Education of Shandong University, Jinan, China
| | - Xun Li
- College of Sports and Health, Shandong Sport University, Jinan, China
| | - Xuejiao Li
- School of Physical Education of Shandong University, Jinan, China
| | - Chuanning Sun
- School of Physical Education of Shandong University, Jinan, China
| | - Xianliang Zhang
- School of Physical Education of Shandong University, Jinan, China.
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21
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Hua YY, Zhang Y, Gong WW, Ding Y, Shen JR, Li H, Chen Y, Meng GL. Dihydromyricetin Improves Endothelial Dysfunction in Diabetic Mice via Oxidative Stress Inhibition in a SIRT3-Dependent Manner. Int J Mol Sci 2020; 21:ijms21186699. [PMID: 32933152 PMCID: PMC7555401 DOI: 10.3390/ijms21186699] [Citation(s) in RCA: 27] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/12/2020] [Revised: 08/29/2020] [Accepted: 09/08/2020] [Indexed: 02/07/2023] Open
Abstract
Dihydromyricetin (DHY), a flavonoid component isolated from Ampelopsis grossedentata, exerts versatile pharmacological activities. However, the possible effects of DHY on diabetic vascular endothelial dysfunction have not yet been fully elucidated. In the present study, male C57BL/6 mice, wild type (WT) 129S1/SvImJ mice and sirtuin 3 (SIRT3) knockout (SIRT3-/-) mice were injected with streptozotocin (STZ, 60 mg/kg/day) for 5 consecutive days. Two weeks later, DHY were given at the doses of 250 mg/kg by gavage once daily for 12 weeks. Fasting blood glucose (FBG) and glycosylated hemoglobin (HbA1c) level, endothelium-dependent relaxation of thoracic aorta, reactive oxygen species (ROS) production, SIRT3, and superoxide dismutase 2 (SOD2) protein expressions, as well as mitochondrial Deoxyribonucleic Acid (mtDNA) copy number, in thoracic aorta were detected. Our study found that DHY treatment decreased FBG and HbA1c level, improved endothelium-dependent relaxation of thoracic aorta, inhibited oxidative stress and ROS production, and enhanced SIRT3 and SOD2 protein expression, as well as mtDNA copy number, in thoracic aorta of diabetic mice. However, above protective effects of DHY were unavailable in SIRT3-/- mice. The study suggested DHY improved endothelial dysfunction in diabetic mice via oxidative stress inhibition in a SIRT3-dependent manner.
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Affiliation(s)
| | | | | | | | | | | | - Yun Chen
- Correspondence: (Y.C.); (G.-L.M.); Tel.: +86-513-8505-1726 (G.-L.M.); Fax: +86-513-8505-1728 (G.-L.M.)
| | - Guo-Liang Meng
- Correspondence: (Y.C.); (G.-L.M.); Tel.: +86-513-8505-1726 (G.-L.M.); Fax: +86-513-8505-1728 (G.-L.M.)
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22
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Etemad L, Farkhari H, Alavi MS, Roohbakhsh A. The Effect of Dihydromyricetin, a Natural Flavonoid, on
Morphine-induced Conditioned Place Preference and Physical Dependence in
Mice. Drug Res (Stuttg) 2020; 70:410-416. [DOI: 10.1055/a-1206-6757] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
Abstract
Objective Dihydromyricetin (DHM), a natural flavonoid, is used to reduce
alcohol hangover. It has a modulatory role on GABAA receptors with significant
effects on seizure and anxiety in animal models. We aimed to evaluate the effect
of DHM on morphine conditioned place preference (CPP) and withdrawal sings
following morphine dependence using animal models.
Methods The effect of DHM (1, 2 and 5 mg/kg,
intraperitoneal; ip) on the acquisition and expression of morphine-induced CPP
was evaluated in male mice. Administration of morphine for three consecutive
days induced physical dependence. The withdrawal signs such as jumping and
defecation were precipitated by administration of naloxone
(8 mg/kg, ip). The effect of DHM on the development of physical
dependence was assessed by injection of DHM before morphine administrations.
Results DHM, at the dose of 5 mg/kg, reduced expression
of morphine CPP with an increase in the locomotor activity. DHM, at the doses of
2 and 5 mg/kg, also reduced development of morphine CPP. DHM
alleviated development of morphine-induced physical dependence at the dose of 1,
2, and 5 mg/kg by decreasing jumping and defecation.
Conclusion These results indicated that DHM decreased acquisition and
expression of morphine CPP and inhibited development of morphine-induced
physical dependence.
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Affiliation(s)
- Leila Etemad
- Pharmaceutical Research Center, Pharmaceutical Technology Institute,
Mashhad University of Medical Sciences, Mashhad, Iran
| | - Hadi Farkhari
- Department of Pharmacodynamics and Toxicology, School of Pharmacy,
Mashhad University of Medical Sciences, Mashhad, Iran
| | - Mohaddeseh Sadat Alavi
- Department of Pharmacology, Faculty of Medicine, Mashhad University of
Medical Sciences, Mashhad, Iran
- Division of Neurocognitive Sciences, Psychiatry and Behavioral Sciences
Research Center, Mashhad University of Medical Sciences, Mashhad,
Iran
| | - Ali Roohbakhsh
- Pharmaceutical Research Center, Pharmaceutical Technology Institute,
Mashhad University of Medical Sciences, Mashhad, Iran
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Chang Y, Yuan L, Liu J, Muhammad I, Cao C, Shi C, Zhang Y, Li R, Li C, Liu F. Dihydromyricetin attenuates Escherichia coli lipopolysaccharide-induced ileum injury in chickens by inhibiting NLRP3 inflammasome and TLR4/NF-κB signalling pathway. Vet Res 2020; 51:72. [PMID: 32448367 PMCID: PMC7247275 DOI: 10.1186/s13567-020-00796-8] [Citation(s) in RCA: 33] [Impact Index Per Article: 8.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/24/2020] [Accepted: 05/10/2020] [Indexed: 12/15/2022] Open
Abstract
Lipopolysaccharide (LPS) as a major component of Escherichia coli cell wall can cause inflammation and cell death. Dihydromyricetin (ampelopsin, DHM) is a natural flavonoid compound with anti-inflammatory, anti-oxidant and anti-bacterial effects. The preventive effects of DHM against ileum injury remain unclear. Here, we explored the protective role of DHM against LPS-induced ileum injury in chickens. In this study, DHM significantly attenuated LPS-induced alteration in diamine oxidase, malondialdehyde, reduced glutathione, glutathione peroxidase and superoxide dismutase levels in chicken plasma and ileum. Histology evaluation showed that the structure of blood vessels in ileum was seriously fragmented and presence of necrotic tissue in the lumen in the LPS group. Scanning electron microscopic observation revealed that the surface of the villi was rough and uneven, the structure was chaotic, and the normal finger shape was lost in the LPS group. In contrast, 0.05% and 0.1% DHM treatment partially alleviated the abnormal morphology. Additionally, DHM maintained the barrier function by restoring the protein expression of occludin, claudin-1 and zonula occludens protein-1. DHM inhibited apoptosis through the reduction of the expression of bax and caspase-3 and restored the expression of bcl-2. Importantly, DHM could reduce ileum NLR family pyrin domain-containing 3 (NLRP3), caspase-1, interleukin (IL)-1β and IL-18 expression to protect tissues from pyroptosis and inhibited toll-like receptor 4 (TLR4)/nuclear factor kappa-B (NF-κB) signalling pathway. In summary, DHM attenuated the ileum mucosal damage, oxidative stress and apoptosis, maintained barrier function, inhibited NLRP3 inflammasome and TLR4/NF-κB signalling pathway activation triggered by Escherichia coli LPS.
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Affiliation(s)
- Yicong Chang
- Department of Basic Veterinary Science, College of Veterinary Medicine, Northeast Agricultural University, Harbin, China
| | - Liang Yuan
- Department of Basic Veterinary Science, College of Veterinary Medicine, Northeast Agricultural University, Harbin, China
| | - Jiarui Liu
- Department of Basic Veterinary Science, College of Veterinary Medicine, Northeast Agricultural University, Harbin, China
| | - Ishfaq Muhammad
- Department of Basic Veterinary Science, College of Veterinary Medicine, Northeast Agricultural University, Harbin, China
| | - Chuanbao Cao
- Department of Basic Veterinary Science, College of Veterinary Medicine, Northeast Agricultural University, Harbin, China
| | - Chenxi Shi
- Department of Basic Veterinary Science, College of Veterinary Medicine, Northeast Agricultural University, Harbin, China
| | - Yuanyuan Zhang
- Department of Basic Veterinary Science, College of Veterinary Medicine, Northeast Agricultural University, Harbin, China
| | - Rui Li
- Department of Basic Veterinary Science, College of Veterinary Medicine, Northeast Agricultural University, Harbin, China.,Heilongjiang Key Laboratory for Animal Disease Control and Pharmaceutical Development, Harbin, China
| | - Changwen Li
- Harbin Veterinary Research Institute of Chinese Academy of Agricultural Sciences, Harbin, China
| | - Fangping Liu
- Department of Basic Veterinary Science, College of Veterinary Medicine, Northeast Agricultural University, Harbin, China. .,Heilongjiang Key Laboratory for Animal Disease Control and Pharmaceutical Development, Harbin, China.
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Metabolomics of the Protective Effect of Ampelopsis grossedentata and Its Major Active Compound Dihydromyricetin on the Liver of High-Fat Diet Hamster. EVIDENCE-BASED COMPLEMENTARY AND ALTERNATIVE MEDICINE 2020; 2020:3472578. [PMID: 32071609 PMCID: PMC7007936 DOI: 10.1155/2020/3472578] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 07/03/2019] [Revised: 09/30/2019] [Accepted: 10/05/2019] [Indexed: 11/18/2022]
Abstract
The flavonoid dihydromyricetin (DMY) is the main component of Ampelopsis grossedentata (Hand-Mazz) W. T. Wang (AG), a daily beverage and folk medicine used in Southern China to treat jaundice hepatitis, cold fever, and sore throat. Recently, DMY and AG were shown to have a beneficial effect on lipid metabolism disorder. However, the mechanisms of how DMY and AG protect the liver during lipid metabolism disorder remain unclear. In this study, we first analyzed the chemical compounds of AG by HPLC-DAD-ESI-IT-TOF-MSn. Of the 31 compounds detected, 29 were identified based on previous results. Then, the effects of DMY and AG on high-fat diet hamster livers were studied and the metabolite levels and metabolic pathway activity of the liver were explored by 1H NMR metabolomics. Compared to the high-fat diet group, supplementation of AG and DMY attenuated the high-fat-induced increase in body weight, liver lipid deposition, serum triglycerides and total cholesterol levels, and normalized endogenous metabolite concentrations. PCA and PLS-DA score plots demonstrated that while the metabolic profiles of hamsters fed a high-fat diet supplemented with DMY or AG were both far from those of hamsters fed a normal diet or a high-fat diet alone, they were similar to each other. Our data suggest that the underlying mechanism of the protective effect of DMY and AG might be related to an attenuation of the deleterious effect of high-fat diet-induced hyperlipidemia on multiple metabolic pathways including amino acid metabolism, ketone body metabolism, energy metabolism, tricarboxylic acid cycle, and enhanced fatty acid oxidation.
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25
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Tong H, Zhang X, Tan L, Jin R, Huang S, Li X. Multitarget and promising role of dihydromyricetin in the treatment of metabolic diseases. Eur J Pharmacol 2019; 870:172888. [PMID: 31866404 DOI: 10.1016/j.ejphar.2019.172888] [Citation(s) in RCA: 24] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/30/2019] [Revised: 12/01/2019] [Accepted: 12/18/2019] [Indexed: 12/30/2022]
Abstract
Dihydromyricetin (DMY or DHM), also known as ampelopsin, is the main natural flavonol compound extracted from the plant Ampelopsis grossedentata (Hand. -Mazz) W.T. Wang. In recent years, accumulating studies have been conducted to explore the extensive biological functions of DMY, including antitumor, anti-inflammation, organ-protective, and metabolic regulation effects. DMY acts as a potential preventive or therapeutic agent in treating multiple diseases, such as diabetes mellitus, atherosclerosis, nonalcoholic fatty liver disease and osteoporosis. This review article summarizes the preventive and therapeutic potential of DMY in multiple metabolic diseases and the main signaling pathways in which DMY participates to offer a comprehensive understanding and guidance for future studies.
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Affiliation(s)
- Haihui Tong
- Department of Pediatrics, Wuhan Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, No. 1277 Jie Fang Avenue, Wuhan, Hubei Province, 430022, China.
| | - Xuejun Zhang
- Department of Orthopedics, The People's Hospital of China Three Gorges University, First People's Hospital of Yichang, No. 4 Hudi Street, Yichang, Hubei Province, 443000, China.
| | - Lingfang Tan
- Department of Pediatrics, Wuhan Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, No. 1277 Jie Fang Avenue, Wuhan, Hubei Province, 430022, China.
| | - Runming Jin
- Department of Pediatrics, Wuhan Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, No. 1277 Jie Fang Avenue, Wuhan, Hubei Province, 430022, China.
| | - Shilong Huang
- Department of Orthopedics, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, No. 1095 Jie Fang Avenue, Wuhan, Hubei Province, 430030, China.
| | - Xin Li
- Department of Pediatrics, Wuhan Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, No. 1277 Jie Fang Avenue, Wuhan, Hubei Province, 430022, China.
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26
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Preparation of a nanoscale dihydromyricetin-phospholipid complex to improve the bioavailability: in vitro and in vivo evaluations. Eur J Pharm Sci 2019; 138:104994. [PMID: 31302210 DOI: 10.1016/j.ejps.2019.104994] [Citation(s) in RCA: 36] [Impact Index Per Article: 7.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/13/2019] [Revised: 06/28/2019] [Accepted: 07/10/2019] [Indexed: 02/06/2023]
Abstract
Dihydromyricetin (DMY), a flavanonol compound found as the most abundant and bioactive constituent in Ampelopsis grossedentata (Hand-Mazz) W.T. Wang, possesses numerous pharmacological activities, such as antioxidant, anti-inflammation, anticancer, anti-microbial, hypoglycemic and hypolipidemic effects, and so on. Recently, DMY shows a promising potential to develop as an agent for the prevention and treatment of Type 2 diabetes mellitus (T2DM). However, the low oral bioavailability of DMY was one of the special concerns to be resolved for its clinical applications. In this study, DMY phospholipid complex (DMY-HSPC COM) was prepared by the solvent evaporation technique and optimized with DMY combination ratio. Scanning electron microscopy (SEM), X-ray powder diffraction (XRPD), differential scanning calorimetry (DSC), and Fourier transform infrared spectrophotometry (FT-IR) were carried to characterize the formation of DMY-HSPC COM. The particle size, zeta potential, drug loading and solubility of DMY-HSPC COM were further investigated. The phospholipid complex technology could significantly improve the solubility of DMY. Pharmacokinetic study results of DMY-HSPC COM in healthy SD rats and T2DM rats demonstrated that the oral bioavailability was significantly increased when compared with pure DMY as well, which could be attributed to the improvement of the aqueous solubility of the complex, absorption promotion and a probable decrease in intestinal and hepatic metabolism. In addition, when compared with healthy SD rats, pharmacokinetic parameters of pure DMY and DMY-HSPC COM showed significant difference in T2DM rats. Thus, phospholipid complex technology holds a promising potential for increasing the oral bioavailability of DMY.
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27
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Trujillo‐Estrada L, Nguyen C, da Cunha C, Cai L, Forner S, Martini AC, Ager RR, Prieto GA, Cotman CW, Baglietto‐Vargas D, LaFerla FM. Tau underlies synaptic and cognitive deficits for type 1, but not type 2 diabetes mouse models. Aging Cell 2019; 18:e12919. [PMID: 30809950 PMCID: PMC6516168 DOI: 10.1111/acel.12919] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/21/2018] [Revised: 12/25/2018] [Accepted: 01/13/2019] [Indexed: 01/07/2023] Open
Abstract
Diabetes mellitus (DM) is one of the most devastating diseases that currently affects the aging population. Recent evidence indicates that DM is a risk factor for many brain disorders, due to its direct effects on cognition. New findings have shown that the microtubule-associated protein tau is pathologically processed in DM; however, it remains unknown whether pathological tau modifications play a central role in the cognitive deficits associated with DM. To address this question, we used a gain-of-function and loss-of-function approach to modulate tau levels in type 1 diabetes (T1DM) and type 2 diabetes (T2DM) mouse models. Our study demonstrates that tau differentially contributes to cognitive and synaptic deficits induced by DM. On one hand, overexpressing wild-type human tau further exacerbates cognitive and synaptic impairments induced by T1DM, as human tau mice treated under T1DM conditions show robust deficits in learning and memory processes. On the other hand, neither a reduction nor increase in tau levels affects cognition in T2DM mice. Together, these results shine new light onto the different molecular mechanisms that underlie the cognitive and synaptic impairments associated with T1DM and T2DM.
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Affiliation(s)
- Laura Trujillo‐Estrada
- Institute for Memory Impairments and Neurological DisordersUniversity of CaliforniaIrvineCalifornia
| | - Cassidy Nguyen
- Institute for Memory Impairments and Neurological DisordersUniversity of CaliforniaIrvineCalifornia
| | - Celia da Cunha
- Institute for Memory Impairments and Neurological DisordersUniversity of CaliforniaIrvineCalifornia
| | - Lena Cai
- Institute for Memory Impairments and Neurological DisordersUniversity of CaliforniaIrvineCalifornia
| | - Stefania Forner
- Institute for Memory Impairments and Neurological DisordersUniversity of CaliforniaIrvineCalifornia
| | - Alessandra C. Martini
- Institute for Memory Impairments and Neurological DisordersUniversity of CaliforniaIrvineCalifornia
| | - Rahasson R. Ager
- Institute for Memory Impairments and Neurological DisordersUniversity of CaliforniaIrvineCalifornia
| | - Gilberto Aleph Prieto
- Institute for Memory Impairments and Neurological DisordersUniversity of CaliforniaIrvineCalifornia
| | - Carl W. Cotman
- Institute for Memory Impairments and Neurological DisordersUniversity of CaliforniaIrvineCalifornia
- Department of Neurobiology and BehaviorUniversity of CaliforniaIrvineCalifornia
- Department of NeurologyUniversity of CaliforniaIrvineCalifornia
| | - David Baglietto‐Vargas
- Institute for Memory Impairments and Neurological DisordersUniversity of CaliforniaIrvineCalifornia
- Department of Neurobiology and BehaviorUniversity of CaliforniaIrvineCalifornia
| | - Frank M. LaFerla
- Institute for Memory Impairments and Neurological DisordersUniversity of CaliforniaIrvineCalifornia
- Department of Neurobiology and BehaviorUniversity of CaliforniaIrvineCalifornia
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28
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AS1949490, an inhibitor of 5′-lipid phosphatase SHIP2, promotes protein kinase C-dependent stabilization of brain-derived neurotrophic factor mRNA in cultured cortical neurons. Eur J Pharmacol 2019; 851:69-79. [DOI: 10.1016/j.ejphar.2019.02.003] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/07/2018] [Revised: 02/04/2019] [Accepted: 02/08/2019] [Indexed: 12/11/2022]
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29
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Guan S, Shen Y, Ge H, Xiong W, He L, Liu L, Yin C, Wei X, Gao Y. Dihydromyricetin Alleviates Diabetic Neuropathic Pain and Depression Comorbidity Symptoms by Inhibiting P2X 7 Receptor. Front Psychiatry 2019; 10:770. [PMID: 31681052 PMCID: PMC6813736 DOI: 10.3389/fpsyt.2019.00770] [Citation(s) in RCA: 27] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/13/2018] [Accepted: 09/24/2019] [Indexed: 12/12/2022] Open
Abstract
Diabetic neuropathic pain (DNP) and major depressive disorder (MDD) are common complications of diabetes mellitus and mutually affect each other. As a member of the ATP-gated ion channel family, P2X7 receptor is associated with the transduction of pain signal and the onset of depression. The aim of this study was to investigate the effects of dihydromyricetin (DHM) on rats with comorbid DNP and MDD. After the comorbid model was established, rat behavior changes were monitored by measuring the mechanical withdrawal threshold, thermal withdrawal latency, sugar water preference, immobility time in the forced-swim test, and open-field test parameters. The expressions of P2X7 receptor in the dorsal root ganglia (DRGs), spinal cord, and hippocampus were assessed by quantitative real-time PCR, Western blotting, and double immunofluorescence. We found that hyperalgesia, allodynia, and depressive behaviors of rats with comorbid DNP and MDD were relieved by treatment with DHM or application of a short-hairpin RNA for P2X7 receptor. The expression levels of P2X7, phosphorylated extracellular signal-regulated kinase 1/2, tumor necrosis factor α, and interleukin 1ß were increased in the DRGs, spinal cord, and hippocampus of rats in the model group but restored after DHM or P2X7 short-hairpin RNA treatment. In conclusion, P2X7 receptor in the DRGs, spinal cord, and hippocampus participates in the transduction of DNP and MDD signals. DHM seems to relieve comorbid DNP and MDD by reducing the expression of P2X7 receptor in the DRGs, spinal cord, and hippocampus and may be an effective new drug for the treatment of patients with both DNP and MDD.
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Affiliation(s)
- Shu Guan
- Department of Physiology, Basic Medical College, Nanchang University, Nanchang, China
| | - Yulin Shen
- Department of Physiology, Basic Medical College, Nanchang University, Nanchang, China.,Sport Biological Centre, China Institute of Sport Science, Beijing, China
| | - Huixiang Ge
- Department of Physiology, Basic Medical College, Nanchang University, Nanchang, China
| | - Wei Xiong
- Department of Preventive Dentistry, Affiliated Stomatological Hospital of Nanchang University, Nanchang, China
| | - Lingkun He
- Department of Preventive Dentistry, Affiliated Stomatological Hospital of Nanchang University, Nanchang, China
| | - Lijuan Liu
- Department of Preventive Dentistry, Affiliated Stomatological Hospital of Nanchang University, Nanchang, China
| | - Cancan Yin
- Department of Preventive Dentistry, Affiliated Stomatological Hospital of Nanchang University, Nanchang, China
| | - Xingyu Wei
- Basic Medical College of Grade 2017, Nanchang University, Nanchang, China
| | - Yun Gao
- Department of Physiology, Basic Medical College, Nanchang University, Nanchang, China.,Jiangxi Provincial Key Laboratory of Autonomic Nervous Function and Disease, Nanchang University, Nanchang, China
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30
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Liang J, Wu J, Wang F, Zhang P, Zhang X. Semaphoring 4D is required for the induction of antioxidant stress and anti-inflammatory effects of dihydromyricetin in colon cancer. Int Immunopharmacol 2018; 67:220-230. [PMID: 30562683 DOI: 10.1016/j.intimp.2018.12.025] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/22/2018] [Revised: 12/07/2018] [Accepted: 12/10/2018] [Indexed: 12/13/2022]
Abstract
Semaphorin 4D (Sema4D) has been involved in cancer progression, the expression of which is associated with the poor clinical outcomes of some cancer patients. Dihydromyricetin (DMY) has antitumor potentials for different types of human cancer cells. However, the pharmacological effects of DMY on colon cancer (CC) or the regulatory effects of Sema4D on this process remain largely unknown. In the present study, we aimed to evaluate the effects of DMY on CC, and to elucidate the role of Sema4D in DMY-induced antitumor effects. DMY inhibited the proliferation and growth of Colo-205 colon cancer cells significantly in vivo and in vitro. DMY inhibited reactive oxygen species (ROS) and malondialdehyde (MDA) levels, but increased glutathione (GSH) level. Moreover, the activities of antioxidant enzymes catalase (CAT), superoxide dismutase (SOD), glutathione peroxidase (GPx), glutathione reductase (GR) and heme oxygenase 1 (HO-1) were enhanced by DMY treatment in vitro, showing strong anti-oxidative stress effect. In addition, DMY inhibited the secretion of interleukin 1β (IL-1β), interleukin-6 (IL-6), interleukin-8 (IL-8) and tumor necrosis factor (TNF-α) in the supernatant of Colo-205 culture medium. Besides, the expressions of cyclooxygenase (COX-2) and inducible nitric oxide synthase (iNOS) were suppressed by DMY in dose-dependent manners in vivo, showing potent anti-inflammatory effect. Further investigations showed that DMY suppressed the expression and secretion of Sema4D in Colo-205 cells and tissues. Interestingly, overexpression of Sema4D significantly weakened the regulatory effects of DMY on oxidative stress. Furthermore, overexpression of Sema4D significantly attenuated the anti-inflammatory effects of DMY. Collectively, we drew a conclusion that the anti-colon cancer effect of DMY was attributed to its negative modulation on oxidative stress and inflammation via suppression of Sema4D. The findings broaden the width and depth of molecular mechanisms involved in the DMY action, facilitating the development of DMY in anti-colon cancer therapies.
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Affiliation(s)
- Jun Liang
- Oncology Medicine Center, Shanghai East Hospital, Tongji University School of Medicine, Shanghai 200120, China
| | - Jing Wu
- Department of Oncology, Shanghai East Hospital, Tongji University School of Medicine, Shanghai 200120, China
| | - Fei Wang
- Department of Oncology, Shanghai East Hospital, Tongji University School of Medicine, Shanghai 200120, China
| | - Pengfei Zhang
- Department of Oncology, Shanghai East Hospital, Tongji University School of Medicine, Shanghai 200120, China
| | - Xuemei Zhang
- Department of Oncology, Shanghai East Hospital, Tongji University School of Medicine, Shanghai 200120, China.
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31
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Liu CM, Yang W, Ma JQ, Yang HX, Feng ZJ, Sun JM, Cheng C, Jiang H. Dihydromyricetin Inhibits Lead-Induced Cognitive Impairments and Inflammation by the Adenosine 5'-Monophosphate-Activated Protein Kinase Pathway in Mice. JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY 2018; 66:7975-7982. [PMID: 29975840 DOI: 10.1021/acs.jafc.8b02433] [Citation(s) in RCA: 25] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
Dihydromyricetin (DHM), a natural flavonoid derived from the medicinal and edible plant Ampelopsis grossedentata, exhibits antioxidant, antiapoptosis, antitumor, and anti-inflammatory bioactivities. This study evaluated the effects of DHM on Pb-induced neurotoxicity and explored the underlying mechanisms. DHM significantly ameliorated behavioral impairments of Pb-induced mice. It decreased the levels of lipid peroxidation and protein carbonyl and increased the activities of superoxide dismutase and catalase in the brains. DHM suppressed Pb-induced apoptosis, as indicated by the decreased levels of Bax and cleaved caspase-3. DHM also decreased inflammatory cytokines in the brains of Pb-treated mice. DHM decreased amyloid-beta (Aβ) level and nuclear factor-κB nuclear translocation. Moreover, DHM induced the adenosine 5'-monophosphate-activated protein kinase (AMPK) phosphorylation and inhibited the activation of p38, Toll-like receptor 4, myeloid differentiation factor 88, and glycogen synthase kinase-3. Collectively, this is the first report indicating that DHM could improve Pb-induced cognitive functional impairment by preventing oxidative stress, apoptosis, and inflammation and that the protective effect was mediated partly through the AMPK pathway.
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Affiliation(s)
- Chan-Min Liu
- School of Life Science , Jiangsu Normal University , No.101, Shanghai Road , Tangshan New Area, 221116 , Xuzhou City , Jiangsu Province , PR China
| | - Wei Yang
- School of Life Science , Jiangsu Normal University , No.101, Shanghai Road , Tangshan New Area, 221116 , Xuzhou City , Jiangsu Province , PR China
| | - Jie-Qiong Ma
- School of Chemistry and Pharmaceutica Engineering , Sichuan University of Science and Engineering , Xuyuan road , 643000 , Zigong City , Sichuan Province , PR China
| | - Hui-Xin Yang
- School of Life Science , Jiangsu Normal University , No.101, Shanghai Road , Tangshan New Area, 221116 , Xuzhou City , Jiangsu Province , PR China
| | - Zhao-Jun Feng
- School of Life Science , Jiangsu Normal University , No.101, Shanghai Road , Tangshan New Area, 221116 , Xuzhou City , Jiangsu Province , PR China
| | - Jian-Mei Sun
- School of Life Science , Jiangsu Normal University , No.101, Shanghai Road , Tangshan New Area, 221116 , Xuzhou City , Jiangsu Province , PR China
| | - Chao Cheng
- School of Life Science , Jiangsu Normal University , No.101, Shanghai Road , Tangshan New Area, 221116 , Xuzhou City , Jiangsu Province , PR China
| | - Hong Jiang
- School of Life Science , Jiangsu Normal University , No.101, Shanghai Road , Tangshan New Area, 221116 , Xuzhou City , Jiangsu Province , PR China
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