1
|
Wang J, Liao N, Liu G, Li Y, Xu F, Shi J. Diversity and regioselectivity of O-methyltransferases catalyzing the formation of O-methylated flavonoids. Crit Rev Biotechnol 2024; 44:1203-1225. [PMID: 38035668 DOI: 10.1080/07388551.2023.2280755] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/25/2023] [Revised: 08/26/2023] [Accepted: 10/17/2023] [Indexed: 12/02/2023]
Abstract
Flavonoids and their methylated derivatives have immense market potential in the food and biomedical industries due to their multiple beneficial effects, such as antimicrobial, anti-inflammatory, and anticancer activities. The biological synthesis of flavonoids and their derivatives is often accomplished via the use of genetically modified microorganisms to ensure large-scale production. Therefore, it is pivotal to understand the properties of O-methyltransferases (OMTs) that mediate the methylation of flavonoids. However, the properties of these OMTs are governed by their: sources, substrate specificity, amino acid residues in the active sites, and the intricate mechanism. In order to obtain a clue for the selection of suitable OMTs for the biosynthesis of a target methylated flavonoid, we made a comprehensive review of the currently reported results, with a particular focus on their comparative regioselectivity for different flavonoid substrates. Additionally, the possible mechanisms for the diversity of this class of enzymes were explored using molecular simulation technology. Finally, major gaps in our understanding and areas for future studies were discussed. The findings of this study may be useful in selecting genes that encode OMTs and designing enzyme-based processes for synthesizing O-methylated flavonoids.
Collapse
Affiliation(s)
- Juan Wang
- Key Laboratory for Space Bioscience and Biotechnology, School of Life Sciences, Northwestern Polytechnical University, Xi'an, People's Republic of China
| | - Ning Liao
- Key Laboratory for Space Bioscience and Biotechnology, School of Life Sciences, Northwestern Polytechnical University, Xi'an, People's Republic of China
| | - Guanwen Liu
- Key Laboratory for Space Bioscience and Biotechnology, School of Life Sciences, Northwestern Polytechnical University, Xi'an, People's Republic of China
| | - Yinghui Li
- Key Laboratory for Space Bioscience and Biotechnology, School of Life Sciences, Northwestern Polytechnical University, Xi'an, People's Republic of China
| | - Fengqin Xu
- Key Laboratory for Space Bioscience and Biotechnology, School of Life Sciences, Northwestern Polytechnical University, Xi'an, People's Republic of China
| | - Junling Shi
- Key Laboratory for Space Bioscience and Biotechnology, School of Life Sciences, Northwestern Polytechnical University, Xi'an, People's Republic of China
| |
Collapse
|
2
|
7,8-Dihydroxyflavone Attenuates Inflammatory Response and Insulin Resistance Induced by the Paracrine Interaction between Adipocytes and Macrophages. Int J Mol Sci 2023; 24:ijms24043520. [PMID: 36834930 PMCID: PMC9961847 DOI: 10.3390/ijms24043520] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/02/2023] [Revised: 02/07/2023] [Accepted: 02/08/2023] [Indexed: 02/12/2023] Open
Abstract
Obesity-induced inflammation and insulin resistance are mediated by macrophage infiltration into adipose tissue. We investigated the effects of 7,8-dihydroxyflavone (7,8-DHF), a flavone found in plants, on the inflammatory response and insulin resistance induced by the interaction between adipocytes and macrophages. Hypertrophied 3T3-L1 adipocytes were cocultured with RAW 264.7 macrophages and treated with 7,8-DHF (3.12, 12.5, and 50 μM). The inflammatory cytokines and free fatty acid (FFA) release were evaluated by assay kits, and signaling pathways were determined by immunoblotting. Coculture of adipocytes and macrophages increased inflammatory mediators, such as nitric oxide (NO), monocyte chemoattractant protein-1 (MCP-1), tumor necrosis factor-alpha (TNF-α), and interleukin-6 (IL-6) and FFA secretion but suppressed the production of anti-inflammatory adiponectin. 7,8-DHF counteracted the coculture-induced changes (p < 0.001). 7,8-DHF also inhibited c-Jun N-terminal kinase (JNK) activation and blocked nuclear factor kappa B (NF-κB) nuclear translocation in the coculture system (p < 0.01). In addition, adipocytes cocultured with macrophages did not increase glucose uptake and Akt phosphorylation in response to insulin. However, 7,8-DHF treatment recovered the impaired responsiveness to insulin (p < 0.01). These findings show that 7,8-DHF alleviates inflammation and adipocyte dysfunction in the coculture of hypertrophied 3T3-L1 adipocytes and RAW 264.7 macrophages, indicating its potential as a therapeutic agent for obesity-induced insulin resistance.
Collapse
|
3
|
Tan Y, Yang J, Jiang Y, Sun S, Wei X, Wang R, Bu J, Li D, Kang L, Chen T, Guo J, Cui G, Tang J, Huang L. Identification and characterization of two Isatis indigotica O-methyltransferases methylating C-glycosylflavonoids. HORTICULTURE RESEARCH 2022; 9:uhac140. [PMID: 36072835 PMCID: PMC9437721 DOI: 10.1093/hr/uhac140] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 12/30/2021] [Accepted: 06/14/2022] [Indexed: 06/15/2023]
Abstract
Isatis indigotica accumulates several active substances, including C-glycosylflavonoids, which have important pharmacological activities and health benefits. However, enzymes catalyzing the methylation step of C-glycosylflavonoids in I. indigotica remain unknown. In this study, three O-methyltransferases (OMTs) were identified from I. indigotica that have the capacity for O-methylation of the C-glycosylflavonoid isoorientin. The Type II OMTs IiOMT1 and IiOMT2 efficiently catalyze isoorientin to form isoscoparin, and decorate one of the aromatic vicinal hydroxyl groups on flavones and methylate the C6, C8, and 3'-hydroxyl positions to form oroxylin A, wogonin, and chrysoeriol, respectively. However, the Type I OMT IiOMT3 exhibited broader substrate promiscuity and methylated the C7 and 3'-hydroxyl positions of flavonoids. Further site-directed mutagenesis studies demonstrated that five amino acids of IiOMT1/IiOMT2 (D121/D100, D173/D149, A174/A150R, N200/N176, and D248/D233) were critical residues for their catalytic activity. Additionally, only transient overexpression of Type II OMTs IiOMT1 and IiOMT2 in Nicotiana benthamiana significantly increased isoscoparin accumulation, indicating that the Type II OMTs IiOMT1 and IiOMT2 could catalyze the methylation step of C-glycosylflavonoid, isoorientin at the 3'-hydroxyl position. This study provides insights into the biosynthesis of methylated C-glycosylflavonoids, and IiOMTs could be promising catalysts in the synthesis of bioactive compounds.
Collapse
Affiliation(s)
- Yuping Tan
- State Key Laboratory of Dao-di Herbs, National Resource Center for Chinese Materia Medica, China Academy of Chinese Medical Sciences, Beijing 100700, China
- School of Traditional Chinese Medicine, Shenyang Pharmaceutical University, Shenyang 117004, China
| | - Jian Yang
- State Key Laboratory of Dao-di Herbs, National Resource Center for Chinese Materia Medica, China Academy of Chinese Medical Sciences, Beijing 100700, China
| | - Yinyin Jiang
- State Key Laboratory of Dao-di Herbs, National Resource Center for Chinese Materia Medica, China Academy of Chinese Medical Sciences, Beijing 100700, China
| | - Shufu Sun
- State Key Laboratory of Dao-di Herbs, National Resource Center for Chinese Materia Medica, China Academy of Chinese Medical Sciences, Beijing 100700, China
- School of Pharmacy, Anhui University of Chinese Medicine, Hefei 230012, China
| | - Xiaoyan Wei
- State Key Laboratory of Dao-di Herbs, National Resource Center for Chinese Materia Medica, China Academy of Chinese Medical Sciences, Beijing 100700, China
- College of Chinese Medicinal Materials, Jilin Agricultural University, Changchun 130118, China
| | - Ruishan Wang
- State Key Laboratory of Dao-di Herbs, National Resource Center for Chinese Materia Medica, China Academy of Chinese Medical Sciences, Beijing 100700, China
| | - Junling Bu
- State Key Laboratory of Dao-di Herbs, National Resource Center for Chinese Materia Medica, China Academy of Chinese Medical Sciences, Beijing 100700, China
| | - Dayong Li
- National Engineering Research Center for Vegetables, Beijing Vegetable Research Center, Beijing Academy of Agriculture and Forestry Science, Beijing 100097, China
| | - Liping Kang
- State Key Laboratory of Dao-di Herbs, National Resource Center for Chinese Materia Medica, China Academy of Chinese Medical Sciences, Beijing 100700, China
| | - Tong Chen
- State Key Laboratory of Dao-di Herbs, National Resource Center for Chinese Materia Medica, China Academy of Chinese Medical Sciences, Beijing 100700, China
| | - Juan Guo
- State Key Laboratory of Dao-di Herbs, National Resource Center for Chinese Materia Medica, China Academy of Chinese Medical Sciences, Beijing 100700, China
| | - Guanghong Cui
- State Key Laboratory of Dao-di Herbs, National Resource Center for Chinese Materia Medica, China Academy of Chinese Medical Sciences, Beijing 100700, China
| | | | | |
Collapse
|
4
|
7,8-Dihydroxyflavone Enhanced Colonic Cholinergic Contraction and Relieved Loperamide-Induced Constipation in Rats. Dig Dis Sci 2021; 66:4251-4262. [PMID: 33528684 DOI: 10.1007/s10620-020-06817-y] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/15/2020] [Accepted: 12/29/2020] [Indexed: 12/14/2022]
Abstract
BACKGROUND Whether 7,8-dihydroxyflavone (7,8-DHF), a tyrosine kinase receptor B (TrkB) agonist, modulates colonic smooth muscle motility and/or alleviates constipation has not yet been studied. AIMS Here, we aimed to determine how 7,8-DHF influences carbachol (CCh)-stimulated contraction of colonic strips and the in vivo effect of 7,8-DHF on constipation. METHODS Muscle strips were isolated from rat colons for recording contractile tension and performing western blotting. Constipation was induced in rats with loperamide. RESULTS Although it specifically activated TrkB, 7,8-DHF applied alone neither activated PLCγ1 in the colonic strips nor induced colonic strip contraction. However, 7,8-DHF enhanced CCh-stimulated PLCγ1 activation and strip contraction. The PLCγ1 antagonist U73122 suppressed both CCh-stimulated and 7,8-DHF-enhanced/CCh-stimulated contraction. While clarifying the underlying mechanism, we revealed that 7,8-DHF augmented muscarinic M3 receptor expression in the colonic strips. The M3-selective antagonist tarafenacin specifically inhibited the 7,8-DHF-enhanced/CCh-stimulated contraction of the colonic strips. Since 7,8-DHF increased Akt phosphorylation, and LY294002 (an antagonist of PI3K upstream of Akt) dramatically inhibited both 7,8-DHF-augmented M3 expression and 7,8-DHF-enhanced/CCh-stimulated contractions, we assumed that 7,8-DHF/TrkB/Akt was associated with the modulation of M3 expression in the colonic strips. ANA-12, a specific TrkB antagonist, not only inhibited TrkB activation by 7,8-DHF but also suppressed 7,8-DHF-enhanced cholinergic contraction, 7,8-DHF/CCh-mediated activation of PLCγ1/Akt, and M3 overexpression in colonic strips. In vivo 7,8-DHF, also by promoting intestinal motility and M3 expression, significantly alleviated loperamide-induced functional constipation in rats. CONCLUSIONS Our results suggest that 7,8-DHF regulates colonic motility possibly via a TrkB/Akt/M3 pathway and may be applicable for alleviating constipation.
Collapse
|
5
|
Atucha NM, Romecín P, Vargas F, García-Estañ J. Effects of flavonoids in experimental models of arterial hypertension. Curr Top Med Chem 2021; 22:735-745. [PMID: 34749613 DOI: 10.2174/1568026621666211105100800] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/28/2021] [Revised: 07/21/2021] [Accepted: 08/12/2021] [Indexed: 11/22/2022]
Abstract
Flavonoids are a class of substances of a vegetal origin with many interesting actions from the point of view of human disease. Interest in flavonoids in the diet has increased in recent years due to the publication of basic, clinical and epidemiological studies that have shown a whole array of salutory effects related to intake of flavonols and flavones as well as a lower morbility and mortality of cardiovascular diseases. Since arterial hypertension is the most common modifiable risk factor for cardiovascular diseases, this review will focus mainly on the effects of flavonoids on the cardiovascular system with relation to the elevation of blood pressure. Its antihypertensive effects as well as the many investigations performed in experimental models of arterial hypertension are reviewed in this mini-review.
Collapse
Affiliation(s)
- Noemi M Atucha
- Departmento de Fisiología, Facultad de Medicina, Instituto Murciano de Investigación Biomédica, Universidad de Murcia, Murcia, and Granada. Spain
| | - Paola Romecín
- Departmento de Fisiología, Facultad de Medicina, Instituto Murciano de Investigación Biomédica, Universidad de Murcia, Murcia, and Granada. Spain
| | - Felix Vargas
- Departmento de Fisiología, Facultad de Medicina, Instituto Murciano de Investigación Biomédica, Universidad de Murcia, Murcia, and Granada. Spain
| | - Joaquin García-Estañ
- Departmento de Fisiología, Facultad de Medicina, Instituto Murciano de Investigación Biomédica, Universidad de Murcia, Murcia, and Granada. Spain
| |
Collapse
|
6
|
Enhanced BDNF Actions Following Acute Hypoxia Facilitate HIF-1α-Dependent Upregulation of Cav3-T-Type Ca 2+ Channels in Rat Cardiomyocytes. MEMBRANES 2021; 11:membranes11070470. [PMID: 34202148 PMCID: PMC8307968 DOI: 10.3390/membranes11070470] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 06/07/2021] [Revised: 06/16/2021] [Accepted: 06/23/2021] [Indexed: 01/19/2023]
Abstract
Brain-derived neurotrophic factor (BDNF) has recently been recognized as a cardiovascular regulator particularly in the diseased condition, including coronary artery disease, heart failure, cardiomyopathy, and hypertension. Here, we investigate the role of BDNF on the T-type Ca2+ channel, Cav3.1 and Cav3.2, in rat neonatal cardiomyocytes exposed to normoxia (21% O2) and acute hypoxia (1% O2) in vitro for up to 3 h. The exposure of cardiomyocytes to hypoxia (1 h, 3 h) caused a significant upregulation of the mRNAs for hypoxia-inducible factor 1α (Hif1α), Cav3.1, Cav3.2 and Bdnf, but not tropomyosin-related kinase receptor B (TrkB). The upregulation of Cav3.1 and Cav3.2 caused by hypoxia was completely halted by small interfering RNA (siRNA) targeting Hif1a (Hif1a-siRNA) or Bdnf (Bdnf-siRNA). Immunocytochemical staining data revealed a distinct upregulation of Cav3.1- and Cav3.2-proteins caused by hypoxia in cardiomyocytes, which was markedly suppressed by Bdnf-siRNA. These results unveiled a novel regulatory action of BDNF on the T-type Ca2+ channels expression through the HIF-1α-dependent pathway in cardiomyocytes.
Collapse
|
7
|
Hang PZ, Zhu H, Li PF, Liu J, Ge FQ, Zhao J, Du ZM. The Emerging Role of BDNF/TrkB Signaling in Cardiovascular Diseases. Life (Basel) 2021; 11:life11010070. [PMID: 33477900 PMCID: PMC7833389 DOI: 10.3390/life11010070] [Citation(s) in RCA: 22] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/08/2020] [Revised: 01/08/2021] [Accepted: 01/16/2021] [Indexed: 02/06/2023] Open
Abstract
Brain-derived neurotrophic factor (BDNF) is one of the most abundantneurotrophins in the central nervous system. Numerous studies suggestthat BDNF has extensive roles by binding to its specific receptor, tropomyosin-related kinase receptor B (TrkB), and thereby triggering downstream signaling pathways. Recently, growing evidence highlightsthat the BDNF/TrkB pathway is expressed in the cardiovascular system andclosely associated with the development and outcome of cardiovascular diseases (CVD), including coronary artery disease, heart failure, cardiomyopathy, hypertension, and metabolic diseases. Furthermore, circulating BDNF has also been revealed as a new potential biomarker for both diagnosis and prognosis of CVD. In this review, we discuss the current evidence of the emerging role of BDNF/TrkBsignalingand address the challenges that remain in translating these discoveries to novel therapeutic strategies for CVD.
Collapse
Affiliation(s)
- Peng-Zhou Hang
- Department of Pharmacy, Clinical Medical College, Yangzhou University, Northern Jiangsu People’s Hospital, Yangzhou 225001, China; (P.-Z.H.); (H.Z.); (F.-Q.G.)
- Institute of Clinical Pharmacology, The Second Affiliated Hospital of Harbin Medical University (University Key Laboratory of Drug Research), Harbin 150086, China; (P.-F.L.); (J.L.)
| | - Hua Zhu
- Department of Pharmacy, Clinical Medical College, Yangzhou University, Northern Jiangsu People’s Hospital, Yangzhou 225001, China; (P.-Z.H.); (H.Z.); (F.-Q.G.)
| | - Pei-Feng Li
- Institute of Clinical Pharmacology, The Second Affiliated Hospital of Harbin Medical University (University Key Laboratory of Drug Research), Harbin 150086, China; (P.-F.L.); (J.L.)
| | - Jie Liu
- Institute of Clinical Pharmacology, The Second Affiliated Hospital of Harbin Medical University (University Key Laboratory of Drug Research), Harbin 150086, China; (P.-F.L.); (J.L.)
| | - Feng-Qin Ge
- Department of Pharmacy, Clinical Medical College, Yangzhou University, Northern Jiangsu People’s Hospital, Yangzhou 225001, China; (P.-Z.H.); (H.Z.); (F.-Q.G.)
| | - Jing Zhao
- Medical Research Center, Clinical Medical College, Yangzhou University, Northern Jiangsu People’s Hospital, Yangzhou 225001, China
- Correspondence: or (J.Z.); or (Z.-M.D.); Tel.: +86-514-8737-3691 (J.Z.); +86-451-8660-5353 (Z.-M.D.); Fax: +86-514-8737-3039 (J.Z.); +86-451-8666-5559 (Z.-M.D.)
| | - Zhi-Min Du
- Institute of Clinical Pharmacology, The Second Affiliated Hospital of Harbin Medical University (University Key Laboratory of Drug Research), Harbin 150086, China; (P.-F.L.); (J.L.)
- State Key Laboratory of Quality Research in Chinese Medicines, Macau University of Science and Technology, Macau 999078, China
- Correspondence: or (J.Z.); or (Z.-M.D.); Tel.: +86-514-8737-3691 (J.Z.); +86-451-8660-5353 (Z.-M.D.); Fax: +86-514-8737-3039 (J.Z.); +86-451-8666-5559 (Z.-M.D.)
| |
Collapse
|
8
|
Feng Z, Wang H, Liu M, Chen T, Liu Y, Xu W, Wang H, Liu J. In situ grafting of PEG Acrylate on drugs with aliphatic hydroxyl functionalities via RAFT polymerization to synthesize drug/polymer conjugates with improved water solubility. Eur Polym J 2021. [DOI: 10.1016/j.eurpolymj.2020.110123] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
|
9
|
Emili M, Guidi S, Uguagliati B, Giacomini A, Bartesaghi R, Stagni F. Treatment with the flavonoid 7,8-Dihydroxyflavone: a promising strategy for a constellation of body and brain disorders. Crit Rev Food Sci Nutr 2020; 62:13-50. [DOI: 10.1080/10408398.2020.1810625] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
Affiliation(s)
- Marco Emili
- Department of Biomedical and Neuromotor Sciences, University of Bologna, Bologna, Italy
| | - Sandra Guidi
- Department of Biomedical and Neuromotor Sciences, University of Bologna, Bologna, Italy
| | - Beatrice Uguagliati
- Department of Biomedical and Neuromotor Sciences, University of Bologna, Bologna, Italy
| | - Andrea Giacomini
- Department of Biomedical and Neuromotor Sciences, University of Bologna, Bologna, Italy
| | - Renata Bartesaghi
- Department of Biomedical and Neuromotor Sciences, University of Bologna, Bologna, Italy
| | - Fiorenza Stagni
- Department for Life Quality Studies, University of Bologna, Rimini, Italy
| |
Collapse
|
10
|
Ma L, Qu Z, Luan X, Jiang X, Pan R, Zhao T, Ma X, He B. Effects of 7,8‐dihydroxyflavone on rat jejunal dynamics subjected to ischaemia–reperfusion injury. Clin Exp Pharmacol Physiol 2019; 47:67-75. [PMID: 31313342 DOI: 10.1111/1440-1681.13136] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/31/2019] [Revised: 07/02/2019] [Accepted: 07/11/2019] [Indexed: 01/07/2023]
Affiliation(s)
- Li Ma
- Department of Clinical Nutrition Affiliated Hospital Qingdao University Qingdao China
| | - Zhiqiang Qu
- Center for Medical Research Affiliated Hospital Qingdao University Qingdao China
| | - Xiao Luan
- Department of Pathophysiology Medical College of Qingdao University Qingdao China
| | - Xiuli Jiang
- Department of Clinical Nutrition Affiliated Hospital Qingdao University Qingdao China
| | - Rongfang Pan
- Department of Clinical Nutrition Affiliated Hospital Qingdao University Qingdao China
| | - Ting Zhao
- Department of Clinical Nutrition Affiliated Hospital Qingdao University Qingdao China
| | - Xuan Ma
- Department of Clinical Nutrition Affiliated Hospital Qingdao University Qingdao China
| | - Baoguo He
- Department of Gastroenterology, Affiliated Hospital Qingdao University Qingdao China
| |
Collapse
|
11
|
Aguilera-Méndez A, Espino-García R, Toledo-López ZJ, Hernández-Gallegos Z, Villafaña-Rauda S, Nieto-Aguilar R, Serrato-Ochoa D, Manuel-Jacobo GC. Biotin improves relaxation of rat aortic rings in combination with antihypertensive drugs. PHARMANUTRITION 2019. [DOI: 10.1016/j.phanu.2019.100147] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
|
12
|
Cai H, Feng J, Wang S, Shu T, Luo Z, Liu S. Tannic acid directed synthesis of Fe3O4@TA@P(NVP-co-NIPAM) magnetic microspheres for polyphenol extraction. Food Chem 2019; 283:530-538. [DOI: 10.1016/j.foodchem.2018.12.125] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/06/2018] [Revised: 12/24/2018] [Accepted: 12/29/2018] [Indexed: 01/18/2023]
|
13
|
Zhao J, Du J, Pan Y, Chen T, Zhao L, Zhu Y, Chen Y, Zheng Y, Liu Y, Sun L, Hang P, Du Z. Activation of cardiac TrkB receptor by its small molecular agonist 7,8-dihydroxyflavone inhibits doxorubicin-induced cardiotoxicity via enhancing mitochondrial oxidative phosphorylation. Free Radic Biol Med 2019; 130:557-567. [PMID: 30472367 DOI: 10.1016/j.freeradbiomed.2018.11.024] [Citation(s) in RCA: 31] [Impact Index Per Article: 6.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/21/2018] [Revised: 11/09/2018] [Accepted: 11/20/2018] [Indexed: 02/08/2023]
Abstract
Brain-derived neurotrophic factor (BDNF)/tropomyosin-related receptor kinase B (TrkB) pathway has been revealed as a novel therapeutic target for several neurological diseases. Recently, small-molecule TrkB agonist 7,8-dihydroxyflavone (7,8-DHF) has received considerable attention as a novel potential candidate for the treatment of various BDNF-implicated human disorders. However, its roles in cardiac diseases are not fully understood. Here, the present study aimed to clarify the effects and mechanisms of 7,8-DHF on doxorubicin (Dox)-induced cardiotoxicity. Kunming mice and H9c2 cells were employed to investigate the functional role of 7,8-DHF both in vivo and in vitro. 7,8-DHF markedly increased cell viability and reduced cell death of Dox-treated cells. Meanwhile, 7,8-DHF significantly increased mitochondrial respiration, membrane potential, and optic atrophy 1 (OPA1) protein expression. 7,8-DHF improved cardiac function and attenuated cardiac injury in Dox mice model. Expression of AMP-activated protein kinase (AMPK) and signal transducers and activators of transcription 3 (STAT3) was restored by 7,8-DHF. Furthermore, the protective role of 7,8-DHF was abolished by ANA-12 (a specific antagonist of TrkB). In elucidating the molecular mechanism, the phosphorylation of Akt was significantly increased while extracellular regulated protein kinase (ERK) was decreased after 7,8-DHF treatment. The regulatory effects of 7,8-DHF on STAT3 and AMPK was reversed by Akt inhibitor. In summary, 7,8-DHF attenuated Dox-induced cardiotoxicity by activating Akt and increasing mitochondrial oxidative phosphorylation and thereby regulating STAT3, AMPK, and ERK signals. The present study enhanced current understanding of TrkB receptor in the cardiovascular system and provided a novel target for prevention and treatment of heart diseases.
Collapse
Affiliation(s)
- Jing Zhao
- Department of Cardiology, the First Affiliated Hospital of Harbin Medical University (Key Laboratory of Cardiac Diseases and Heart Failure, Harbin Medical University), Harbin 150001, PR China
| | - Jingjing Du
- Institute of Clinical Pharmacology, the Second Affiliated Hospital of Harbin Medical University (The University Key Laboratory of Drug Research, Heilongjiang Province), Harbin 150086, PR China
| | - Yang Pan
- Institute of Clinical Pharmacology, the Second Affiliated Hospital of Harbin Medical University (The University Key Laboratory of Drug Research, Heilongjiang Province), Harbin 150086, PR China
| | - Tingting Chen
- Institute of Clinical Pharmacology, the Second Affiliated Hospital of Harbin Medical University (The University Key Laboratory of Drug Research, Heilongjiang Province), Harbin 150086, PR China
| | - Lihui Zhao
- Institute of Clinical Pharmacology, the Second Affiliated Hospital of Harbin Medical University (The University Key Laboratory of Drug Research, Heilongjiang Province), Harbin 150086, PR China
| | - Yanmeng Zhu
- Department of Pharmacology, Harbin Medical University, Harbin 150081, PR China
| | - Yingfu Chen
- Institute of Clinical Pharmacology, the Second Affiliated Hospital of Harbin Medical University (The University Key Laboratory of Drug Research, Heilongjiang Province), Harbin 150086, PR China
| | - Yuyang Zheng
- Institute of Clinical Pharmacology, the Second Affiliated Hospital of Harbin Medical University (The University Key Laboratory of Drug Research, Heilongjiang Province), Harbin 150086, PR China
| | - Yu Liu
- Institute of Clinical Pharmacology, the Second Affiliated Hospital of Harbin Medical University (The University Key Laboratory of Drug Research, Heilongjiang Province), Harbin 150086, PR China
| | - Lihua Sun
- Department of Pharmacology, Harbin Medical University, Harbin 150081, PR China
| | - Pengzhou Hang
- Institute of Clinical Pharmacology, the Second Affiliated Hospital of Harbin Medical University (The University Key Laboratory of Drug Research, Heilongjiang Province), Harbin 150086, PR China; Department of Clinical Pharmacology, College of Pharmacy, Harbin Medical University, Harbin 150081, PR China.
| | - Zhimin Du
- Institute of Clinical Pharmacology, the Second Affiliated Hospital of Harbin Medical University (The University Key Laboratory of Drug Research, Heilongjiang Province), Harbin 150086, PR China; Department of Clinical Pharmacology, College of Pharmacy, Harbin Medical University, Harbin 150081, PR China.
| |
Collapse
|
14
|
He B, Qu Z, Tian Z, Zhao K, Wei L, Ma L. 7,8-dihydroxyflavone enhanced cholinergic contraction of rat gastric smooth muscle via augmenting muscarinic M3 receptor expression. Clin Exp Pharmacol Physiol 2018; 45:1170-1180. [PMID: 29927500 DOI: 10.1111/1440-1681.12999] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/27/2018] [Revised: 06/18/2018] [Accepted: 06/19/2018] [Indexed: 12/27/2022]
Affiliation(s)
- Baoguo He
- Department of Gastroenterology, Affiliated Hospital; Qingdao University; Qingdao China
| | - Zhiqiang Qu
- Center for Medical Research, Affiliated Hospital; Qingdao University; Qingdao China
| | - Zibin Tian
- Department of Gastroenterology, Affiliated Hospital; Qingdao University; Qingdao China
| | - Kun Zhao
- Department of Gastroenterology, Affiliated Hospital; Qingdao University; Qingdao China
| | - Liangzhou Wei
- Department of Gastroenterology, Affiliated Hospital; Qingdao University; Qingdao China
| | - Li Ma
- Department of Clinical Nutrition, Affiliated Hospital; Qingdao University; Qingdao China
| |
Collapse
|
15
|
Totoson P, Pedard M, Marie C, Demougeot C. Activation of endothelial TrkB receptors induces relaxation of resistance arteries. Vascul Pharmacol 2018; 106:46-53. [PMID: 29471140 DOI: 10.1016/j.vph.2018.02.005] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/05/2017] [Revised: 02/07/2018] [Accepted: 02/17/2018] [Indexed: 12/18/2022]
Abstract
While brain-derived neurotrophic factor (BDNF) was previously reported to induce relaxation of conduit artery, whether the BDNF/TrkB (tropomyosin-related kinase) pathway is involved in the tone control of resistance arteries is not known. This study investigated TrkB receptors levels/localization and the vasomotor effect of the TrkB receptor agonist LM22A-4 in isolated third-order mesenteric arteries from rats. Immunostaining revealed the presence of both full-length and truncated TrkB receptors, especially at the endothelial level. By using wire myography, LM22A-4 induced vascular relaxation that was significantly decreased by cyclotraxin B as a non-competitive TrkB antagonist and fully prevented by endothelium removal. Inhibitors of NO, EDHF, PGI2 production and the PI3K/Akt pathways separately reduced LM22A-4 induced-relaxation. By contrast, inhibition of Raf/MEK, PLCγ and CaM/CaMKII pathways did not change the relaxant effect of LM22A-4. Interestingly, BDNF also induced an endothelium and TrkB-dependent relaxation. These results indicate that endothelial TrkB activation results in the relaxation of resistance vessels via PI3K/Akt-induced eNOS phosphorylation and production of EDHF and PGI2. These data are consistent with the contribution of the endothelial BDNF/TrkB pathway to the regulation of peripheral vascular tone. They also validate the use of LM22A-4 as a reliable pharmacological agent for studying the vascular effect of BDNF.
Collapse
Affiliation(s)
- P Totoson
- PEPITE EA4267, FHU INCREASE, Univ. Bourgogne Franche-Comté, F-25030 Besançon, France
| | - M Pedard
- INSERM UMR 1093-CAPS, Univ. Bourgogne Franche-Comté, F-21000 Dijon, France
| | - C Marie
- INSERM UMR 1093-CAPS, Univ. Bourgogne Franche-Comté, F-21000 Dijon, France.
| | - C Demougeot
- PEPITE EA4267, FHU INCREASE, Univ. Bourgogne Franche-Comté, F-25030 Besançon, France
| |
Collapse
|
16
|
Hemoglobin catalyzes CoA degradation and thiol addition to flavonoids. Sci Rep 2018; 8:1282. [PMID: 29352172 PMCID: PMC5775311 DOI: 10.1038/s41598-018-19585-7] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/11/2017] [Accepted: 01/03/2018] [Indexed: 11/18/2022] Open
Abstract
In the presence of CoA, cell-free extracts prepared from porcine liver was found to convert 7,8-dihydroxyflavone (DHF) to a pantetheine conjugate, which was a novel flavonoid. We purified a 7,8-DHF-converting enzyme from the extracts, and identified it as hemoglobin (Hb). The purified Hb showed the following two activities: (i) degradation of CoA into pantetheine through hydrolytic cleavage to yield pantetheine and 3′-phospho-adenosine-5′-diphosphate (ADP) independently of heme, and (ii) addition of a thiol (e.g., pantetheine, glutathione and cysteine) to 7,8-DHF through C-S bond formation. Human Hb also exhibited the above flavonoid-converting activity. In addition, heme-containing enzymes such as peroxidase and catalase added each of pantetheine, glutathione and cysteine to the flavonoid, although no pantetheine conjugates were synthesized when CoA was used as a substrate. These findings indicated that the thiol-conjugating activity is widely observed in heme-containing proteins. On the other hand, only Hb catalyzed the hydrolysis of CoA, followed by the thiol conjugation to synthesize the pantetheine conjugate. To the best of our knowledge, this is the first report showing that Hb has the catalytic ability to convert naturally occurring bioactive compounds, such as dietary flavonoids, to the corresponding conjugates in the presence of thiol donors or CoA.
Collapse
|
17
|
7,8-Dihydroxyflavone attenuates TNF-α-induced skin aging in Hs68 human dermal fibroblast cells via down-regulation of the MAPKs/Akt signaling pathways. Biomed Pharmacother 2017; 95:1580-1587. [DOI: 10.1016/j.biopha.2017.09.098] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/02/2017] [Revised: 09/14/2017] [Accepted: 09/18/2017] [Indexed: 12/21/2022] Open
|
18
|
Sun T, Chen S, Huang H, Li T, Yang W, Liu L. Metabolic profile study of 7, 8-dihydroxyflavone in monkey plasma using high performance liquid chromatography-tandem mass spectrometry. J Chromatogr B Analyt Technol Biomed Life Sci 2017; 1061-1062:97-102. [PMID: 28715685 DOI: 10.1016/j.jchromb.2017.07.001] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/25/2017] [Revised: 06/22/2017] [Accepted: 07/02/2017] [Indexed: 01/17/2023]
Abstract
7, 8-Dihydroxyflavone, as a high-affinity tropomyosin-receptor-kinase B agonist, can mimic the physiological actions of brain-derived neurotrophic factor and exert a variety of neurological actions in numerous models including Parkinsońs disease, depression, learning and memory. Nonetheless, a limited number of studies have been focused on its metabolism in mammal and no methodology has been reported for the determination of 7, 8-DHF and its metabolites. Herein, we developed a rapid, sensitive and accurate method using high performance liquid chromatography-tandem mass spectroscopy for the determination of 7, 8-DHF and its metabolites in monkey plasma. The lower limits of quantification for analytes were 0.4-2.0ngmL-1. The intra-day and inter-day precisions (relative standard deviation, %) of analytes were within 11.83%, and the accuracy (relative error, %) ranged from -6.86 to 14.00%. The mean extraction recoveries for analytes were more than 89.14%. This validated method was successfully applied to the metabolic profile study of 7, 8-DHF in monkey plasma. The results indicated that 7, 8-DHF undergoes methylation, glucuronidation and/or sulfation, and the conjugated forms are the main metabolites in monkey plasma. We further demonstrated that methylated 7, 8-DHF can be also conjugated with glucuronidation/sulfation, and the methylation occurs mainly in the 8 position.
Collapse
Affiliation(s)
- Taoping Sun
- Department of Nutrition and Food Hygiene, Hubei Key Laboratory of Food Nutrition and Safety, School of Public Health, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China
| | - Sijing Chen
- Department of Nutrition and Food Hygiene, Hubei Key Laboratory of Food Nutrition and Safety, School of Public Health, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China
| | - Hao Huang
- Department of Nutrition and Food Hygiene, Hubei Key Laboratory of Food Nutrition and Safety, School of Public Health, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China
| | - Tianqing Li
- Yunnan Key Laboratory of Primate Biomedical Research, Institute of Primate Translational Medicine, Kunming University of Science and Technology, Kunming, China
| | - Wei Yang
- Department of Nutrition and Food Hygiene, Hubei Key Laboratory of Food Nutrition and Safety, School of Public Health, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China
| | - Liegang Liu
- Department of Nutrition and Food Hygiene, Hubei Key Laboratory of Food Nutrition and Safety, School of Public Health, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China.
| |
Collapse
|
19
|
Roco J, Alarcón G, Sierra L, Zampini IC, Ines Isla M, Jerez S. Beneficial effects of hydroalcoholic extract and flavonoids from Zuccagnia punctata in a rabbit model of vascular dysfunction induced by high cholesterol diet. Med Chem Res 2017. [DOI: 10.1007/s00044-017-1934-6] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
|
20
|
Koirala N, Thuan NH, Ghimire GP, Thang DV, Sohng JK. Methylation of flavonoids: Chemical structures, bioactivities, progress and perspectives for biotechnological production. Enzyme Microb Technol 2016; 86:103-16. [PMID: 26992799 DOI: 10.1016/j.enzmictec.2016.02.003] [Citation(s) in RCA: 132] [Impact Index Per Article: 16.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/09/2015] [Revised: 02/02/2016] [Accepted: 02/09/2016] [Indexed: 12/16/2022]
Abstract
Among the natural products, flavonoids have been particularly attractive, highly studied and become one of the most important promising agent to treat cancer, oxidant stress, pathogenic bacteria, inflammations, cardio-vascular dysfunctions, etc. Despite many promising roles of flavonoids, expectations have not been fulfilled when studies were extended to the in vivo condition, particularly in humans. Instability and very low oral bioavailability of dietary flavonoids are the reasons behind this. Researches have demonstrated that the methylation of these flavonoids could increase their promise as pharmaceutical agents leading to novel applications. Methylation of the flavonoids via theirs free hydroxyl groups or C atom dramatically increases their metabolic stability and enhances the membrane transport, leading to facilitated absorption and highly increased oral bioavailability. In this paper, we concentrated on analysis of flavonoid methoxides including O- and C-methoxide derivatives in aspect of structure, bioactivities and description of almost all up-to-date O- and C-methyltransferases' enzymatic characteristics. Furthermore, modern biological approaches for synthesis and production of flavonoid methoxides using metabolic engineering and synthetic biology have been focused and updated up to 2015. This review will give a handful information regarding the methylation of flavonoids, methyltransferases and biotechnological synthesis of the same.
Collapse
Affiliation(s)
- Niranjan Koirala
- Department of BT-Convergent Pharmaceutical Engineering, Institute of Biomolecule Reconstruction, Sun Moon University, 100, Kalsan-ri, Tangjeonmyun, Asansi, Chungnam 336-708, Republic of Korea.
| | - Nguyen Huy Thuan
- Center for Molecular Biology, Institute of Research and Development, Duy Tan University, K7/25 Quang Trung Street, Haichau District, Danang City, Viet Nam.
| | - Gopal Prasad Ghimire
- Department of BT-Convergent Pharmaceutical Engineering, Institute of Biomolecule Reconstruction, Sun Moon University, 100, Kalsan-ri, Tangjeonmyun, Asansi, Chungnam 336-708, Republic of Korea.
| | - Duong Van Thang
- Department of BT-Convergent Pharmaceutical Engineering, Institute of Biomolecule Reconstruction, Sun Moon University, 100, Kalsan-ri, Tangjeonmyun, Asansi, Chungnam 336-708, Republic of Korea.
| | - Jae Kyung Sohng
- Department of BT-Convergent Pharmaceutical Engineering, Institute of Biomolecule Reconstruction, Sun Moon University, 100, Kalsan-ri, Tangjeonmyun, Asansi, Chungnam 336-708, Republic of Korea.
| |
Collapse
|
21
|
Choi JW, Lee CW, Lee J, Choi DJ, Sohng JK, Park YI. 7,8-Dihydroxyflavone inhibits adipocyte differentiation via antioxidant activity and induces apoptosis in 3T3-L1 preadipocyte cells. Life Sci 2015; 144:103-12. [PMID: 26631505 DOI: 10.1016/j.lfs.2015.11.028] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/21/2015] [Revised: 09/29/2015] [Accepted: 11/25/2015] [Indexed: 11/17/2022]
Abstract
AIMS Anti-obesity effects of a natural plant flavonoid 7,8-dihydroxyflavone (7,8-DHF) were evaluated using 3T3-L1 preadipocyte cells. MAIN METHODS The cell viability was determined using MTT assay. Effects of 7,8-DHF on intracellular lipid droplets and intracellular reactive oxygen species (ROS) were measured using a 2,7-dichlorofluorescein diacetate (DCF-DA) assay and Oil Red O staining method, respectively. Apoptotic cell death was monitored by annexin V-FITC/PI double staining and by a TUNEL assay. Antioxidant enzyme mRNA levels and protein expression of adipogenic transcription factors were determined by real-time PCR and Western blotting, respectively. KEY FINDINGS Whereas the cell viability of 3T3-L1 preadipocytes was not affected by lower concentrations of 7,8-DHF (<20 μM), higher concentrations of 7,8-DHF (>20 μM) induced apoptotic cell death. 7,8-DHF (<20 μM) significantly reduced the intracellular lipid droplets and the expression of major adipogenic transcription factors, such as CCAAT/enhancer-binding protein-α (C/EBP-α), C/EBP-β, and peroxisome proliferator activated receptor-γ (PPAR-γ). 7,8-DHF treatment also dose-dependently reduced the intracellular ROS level, attenuated MAPK pathway activation, and increased the expression of antioxidant enzymes, such as Mn-superoxide dismutase (Mn-SOD), catalase (CAT), and heme oxygenase-1 (HO-1). SIGNIFICANCE The results of this study indicated that 7,8-DHF inhibits the adipogenesis of 3T3-L1 preadipocyte cells by down-regulating the expression of adipogenic transcription factors, reduces lipid accumulation, and attenuates ROS accumulation by inducing antioxidant enzymes in differentiated 3T3-L1 cells, suggesting for the first time that 7,8-DHF has an anti-obesity effect in vitro via its anti-oxidant activity.
Collapse
Affiliation(s)
- Ji Won Choi
- Department of Biotechnology, The CUK Agromedical Research Center, The Catholic University of Korea, Bucheon, Gyeonggi-do 420-743, Republic of Korea
| | - Chang Won Lee
- Department of Biotechnology, The CUK Agromedical Research Center, The Catholic University of Korea, Bucheon, Gyeonggi-do 420-743, Republic of Korea
| | - Jisun Lee
- Department of Biotechnology, The CUK Agromedical Research Center, The Catholic University of Korea, Bucheon, Gyeonggi-do 420-743, Republic of Korea
| | - Doo Jin Choi
- Department of Biotechnology, The CUK Agromedical Research Center, The Catholic University of Korea, Bucheon, Gyeonggi-do 420-743, Republic of Korea
| | - Jae Kyung Sohng
- Department of Pharmaceutical Engineering, Institute of Biomolecule Reconstruction, Sun Moon University, Asansi, Chungnam 336-708, Republic of Korea
| | - Yong Il Park
- Department of Biotechnology, The CUK Agromedical Research Center, The Catholic University of Korea, Bucheon, Gyeonggi-do 420-743, Republic of Korea.
| |
Collapse
|
22
|
Wang B, Zhang Q, Yao R, Liu X, Qu Z. 7, 8-Dihydroxyflavone Protects an Endothelial Cell Line from H2O2 Damage. PLoS One 2015; 10:e0135345. [PMID: 26266800 PMCID: PMC4534426 DOI: 10.1371/journal.pone.0135345] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/31/2015] [Accepted: 07/22/2015] [Indexed: 12/31/2022] Open
Abstract
7, 8-dihydroxyflavone (7, 8-DHF), a selective agonist for TrkB receptors, has been well studied for its neurotrophic functions. However, its roles outside the neural tissues have scarcely been studied as yet. In this study, we investigated the protecting roles of 7, 8-DHF in EA.hy926 cells, a human umbilic vein endothelial cell line which was exposed to hydrogen peroxide (H2O2). We found that 7, 8-DHF significantly protected the cells from being damaged by H2O2 through suppression of apoptosis, attenuation of inflammatory factor releasing and inhibition of reactive oxygen species generation. The potent biological effects of 7, 8-DHF were probably executed via its binding to TrkB receptors because the receptor specific antagonist ANA-12 significantly blocked its protecting effects. The protecting roles of 7, 8-DHF in EA.hy926 cells suggest that it will be a promising compound to be developed into a health product that definitely benefits endothelial functions and prevents cardiovascular diseases.
Collapse
Affiliation(s)
- Bingxiang Wang
- Center for Medical Research, the First Affiliated Hospital, Qingdao University, Qingdao, 266555, China; Department of Physiology, Taishan Medical College, Taian, 271000, China
| | - Qian Zhang
- Center for Medical Research, the First Affiliated Hospital, Qingdao University, Qingdao, 266555, China
| | - Ruyong Yao
- Center for Medical Research, the First Affiliated Hospital, Qingdao University, Qingdao, 266555, China
| | - Xiangping Liu
- Center for Medical Research, the First Affiliated Hospital, Qingdao University, Qingdao, 266555, China
| | - Zhiqiang Qu
- Center for Medical Research, the First Affiliated Hospital, Qingdao University, Qingdao, 266555, China
| |
Collapse
|
23
|
Wang B, Li C, Huai R, Qu Z. Overexpression of ANO1/TMEM16A, an arterial Ca2+-activated Cl- channel, contributes to spontaneous hypertension. J Mol Cell Cardiol 2015; 82:22-32. [PMID: 25739000 DOI: 10.1016/j.yjmcc.2015.02.020] [Citation(s) in RCA: 82] [Impact Index Per Article: 9.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/14/2015] [Revised: 02/11/2015] [Accepted: 02/23/2015] [Indexed: 12/21/2022]
Abstract
Calcium-activated chloride channels (CaCCs) have been implicated in hypertension; however, the mechanism underlying their involvement is unknown. The aim of this study was to determine whether the CaCC ANO1 is involved in the pathogenesis of spontaneous hypertension. Arterial ANO1 expression and the effects on blood pressure (BP) of inhibiting ANO1 with an ANO1 inhibitor, T16(Ainh)-A01, and in vivo RNAi, were examined in spontaneously hypertensive rats (SHRs). Knockdown of ANO1 by siRNA prevented hypertensive development, and attenuation of ANO1 channel activity reduced BP in SHRs. Angiotensin II upregulated ANO1 expression in primary cultures of vascular smooth muscle cells (VSMCs). The protein level and activity of cellular ANO1 positively correlated with VSMC proliferation. Our data indicate an important role of increased ANO1 expression and activity in inducing hypertension in SHRs. It may mediate angiotensin II-dependent vascular remodeling. Our results increase the mechanistic understanding of hypertension and suggest ANO1 as a possible therapeutic target for hypertension.
Collapse
Affiliation(s)
- Bingxiang Wang
- Department of Physiology, Center for Medical Research, the First Affiliated Hospital, Medical College of Qingdao University, Qingdao 266071, China; Department of Physiology, Taishan Medical College, Taian 271000, China.
| | - Chunlin Li
- Department of Physiology, Center for Medical Research, the First Affiliated Hospital, Medical College of Qingdao University, Qingdao 266071, China.
| | - Ruituo Huai
- Robot Research Center, Shandong University of Science and Technology, Qingdao 266510, China.
| | - Zhiqiang Qu
- Department of Physiology, Center for Medical Research, the First Affiliated Hospital, Medical College of Qingdao University, Qingdao 266071, China.
| |
Collapse
|
24
|
Madariaga-Mazón A, Hernández-Abreu O, Estrada-Soto S, Mata R. Insights on the vasorelaxant mode of action of malbrancheamide. J Pharm Pharmacol 2015; 67:551-8. [DOI: 10.1111/jphp.12346] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/01/2014] [Accepted: 10/05/2014] [Indexed: 01/25/2023]
Abstract
Abstract
Objectives
This study was conducted to evaluate the vasorelaxant effect of the fungal alkaloids malbrancheamides on pre-contracted rat aorta rings. Also, we explored the probable mode of action using experimental and theoretical docking studies.
Methods
The vasorelaxant effect was assessed on rat aorta rings pre-contracted with noradrenaline (0.1 μm). The mechanism of action was evaluated using different inhibitors of the pathways involved in the vasorelaxation process, such as l-NAME, indomethacin, tetraethylammonium and atropine. The docking analyses were carried out with AutoDock 4.2 software using the crystallized structure of the cyclooxygenase domain of eNOS.
Key findings
Malbrancheamides (1–3) induced a significant vasorelaxant activity in a concentration- and endothelium-intact model in rat aorta rings, and a lesser effect in an endothelium-denuded model. Malbrancheamide-induced vasorelaxation was significantly weakened by pretreatment of endothelium-intact aortic rings with L-NAME (10 μm), indicating a nitrergic relaxant mechanism. Docking analysis predicted that 1–3 could activate eNOS throughout an allosteric fashion at C1 and C2 pockets.
Conclusions
Experimental evidence revealed that malbrancheamides induced both endothelium-independent and endothelium-dependent relaxant effects. According to theoretical studies, it is feasible that the endothelium-independent relaxation exerted by malbrancheamide could be mediated by its calmodulin inhibitory properties throughout an interference with myosin light chain phosphorylation and a positive modulation of eNOS.
Collapse
Affiliation(s)
| | | | - Samuel Estrada-Soto
- Facultad de Farmacia, Universidad Autónoma del Estado de Morelos, Cuernavaca, México
| | - Rachel Mata
- Facultad de Química, Universidad Nacional Autónoma de México, México, México
| |
Collapse
|
25
|
Koirala N, Pandey RP, Parajuli P, Jung HJ, Sohng JK. Methylation and subsequent glycosylation of 7,8-dihydroxyflavone. J Biotechnol 2014; 184:128-37. [PMID: 24858680 DOI: 10.1016/j.jbiotec.2014.05.005] [Citation(s) in RCA: 46] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/10/2014] [Revised: 05/12/2014] [Accepted: 05/13/2014] [Indexed: 12/17/2022]
Abstract
An O-methyltransferase SpOMT2884, originating from Streptomyces peucetius ATCC 27952, was cloned, expressed, and applied for the production of target metabolite from Escherichia coli. Biochemical characterization of the 25kDa recombinant protein by in vitro and in vivo experiments showed that SpOMT2884 was an S-adenosyl-l-methionine-dependent O-methyltransferase. SpOMT2884 catalyzed O-methylation of different classes of flavonoids such as flavones (7,8-dihydroxyflavone (7,8-DHF), luteolin), flavonols (quercetin, rutin), flavanone (naringenin), and isoflavonoids (daidzein, formononetin). Biotransformation of 7,8-DHF, a preferred substrate of SpOMT2884, in a grown-induced culture of E. coli BL21 (DE3) harboring the recombinant pET-28a-SpOMT2884 stoichiometrically converted 7,8-DHF into 7-hydroxy-8-methoxyflavone, which was confirmed by liquid chromatography, mass spectrometry and various nuclear magnetic resonance (NMR) spectroscopy analyses. In order to improve the biotransformation substrate, time and media parameters were optimized and the production was scaled up using a 3-L fermentor. The maximum yield of 7-hydroxy-8-methoxyflavone was 192μM (52.57mg/L), representing almost 96% bioconversion within 12h, when 200μM of 7,8-DHF was supplemented in the culture. Further, the 7-hydroxy-8-methoxyflavone was purified in large scale and was used as a substrate separately for in vitro glycosylation to produce glucose, galactose and 2-deoxyglucose conjugated at 7th hydroxyl position of 7-hydroxy-8-methoxyflavone. Biological activity showed that 7-hydroxy-8-methoxyflavone had long term cytoprotective and antioxidant effects compared to 7,8-DHF suggesting that methylation enhances the stability of substrate and glycosylation has proved to increase the water solubility.
Collapse
Affiliation(s)
- Niranjan Koirala
- Department of Pharmaceutical Engineering, Institute of Biomolecule Reconstruction, Sun Moon University, Asansi, Chungnam 336-708, Republic of Korea
| | - Ramesh Prasad Pandey
- Department of Pharmaceutical Engineering, Institute of Biomolecule Reconstruction, Sun Moon University, Asansi, Chungnam 336-708, Republic of Korea
| | - Prakash Parajuli
- Department of Pharmaceutical Engineering, Institute of Biomolecule Reconstruction, Sun Moon University, Asansi, Chungnam 336-708, Republic of Korea
| | - Hye Jin Jung
- Department of Pharmaceutical Engineering, Institute of Biomolecule Reconstruction, Sun Moon University, Asansi, Chungnam 336-708, Republic of Korea
| | - Jae Kyung Sohng
- Department of Pharmaceutical Engineering, Institute of Biomolecule Reconstruction, Sun Moon University, Asansi, Chungnam 336-708, Republic of Korea.
| |
Collapse
|