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Mohammadi Zonouz A, Ghasemzadeh Rahbardar M, Hosseinzadeh H. The molecular mechanisms of ginkgo (Ginkgo biloba) activity in signaling pathways: A comprehensive review. PHYTOMEDICINE : INTERNATIONAL JOURNAL OF PHYTOTHERAPY AND PHYTOPHARMACOLOGY 2024; 126:155352. [PMID: 38342017 DOI: 10.1016/j.phymed.2024.155352] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/12/2023] [Revised: 11/30/2023] [Accepted: 01/08/2024] [Indexed: 02/13/2024]
Abstract
BACKGROUND One of the most unique plants that have ever grown on the planet is Ginkgo biloba L., a member of the Ginkgoaceae family with no close living relatives. The existence of several differently structured components of G. biloba has increased the chemical variety of herbal therapy. Numerous studies that investigated the biochemical characteristics of G. biloba suggest this plant as a potential treatment for many illnesses. PURPOSE Review the molecular mechanisms involved in the signaling pathways of G. biloba activity in varied circumstances and its potential as a novel treatment for various illnesses. METHODS Studies focusing on the molecular processes and signaling pathways of compounds and extracts of G. biloba were found and summarized using the proper keywords and operators from Google Scholar, PubMed, Web of Science, and Scopus without time restrictions. RESULTS G. biloba exerts its effects through its anti-inflammatory, anti-apoptotic, anti-cancer, neuroprotective, cardioprotective, hepatoprotective, antiviral, antibacterial, pulmoprotective, renoprotective, anti-osteoporosis, anti-melanogenic, retinoprotective, otoprotective, adipogenic, and anti-adipogenic properties. The most important mechanisms involved in these actions are altering the elevation of ROS formation, inhibiting NADPH oxidases activation, altering the expression of antioxidant enzymes, downregulating MAPKs (p38 MAPK and ERK, and JNK) and AP-1, increasing cAMP, inactivating Stat5, activating the AMPK signaling pathway, affecting Stat3/JAK2, NF-κB, Nrf-2, mTOR, HGF/c-Met, Wnt/β-catenin and BMP signaling pathways, and changing the mitochondrial transmembrane potential, the Bax/Bcl-2 ratio, the release of Cyc from mitochondria to cytosol, the protein cleavage of caspases 3, 7, 8, 9, and 12, poly (ADP-ribose) polymerase, and MMPs levels. CONCLUSIONS G. biloba and its components have gained attention in recent years for their therapeutic benefits, such as their anti-inflammatory, antioxidant, anti-apoptotic, and apoptotic effects. By understanding their molecular mechanisms and signaling pathways, potential novel medicines might be developed in response to the rising public desire for new therapies.
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Affiliation(s)
| | | | - Hossein Hosseinzadeh
- Pharmaceutical Research Center, Pharmaceutical Technology Institute, Mashhad University of Medical Sciences, Mashhad, Iran; Department of Pharmacodynamics and Toxicology, School of Pharmacy, Mashhad University of Medical Sciences, Mashhad, Iran.
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Sun Z, Lin S, Wu ZL, Dong HY, Xu XK, Li HL, Wang J. New phenylbutenoids and terpene glycosides from Ginkgo biloba leaves. Chin J Nat Med 2024; 22:161-170. [PMID: 38342568 DOI: 10.1016/s1875-5364(24)60588-1] [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: 08/17/2023] [Indexed: 02/13/2024]
Abstract
Our continued works on the chemical constituents of Ginkgo biloba (G. biloba) leaves has led to the isolation of two novel phenylbutenoids (1, 2), along with five previously unidentified terpene glycosides (3-7). Among them, compounds 1 and 2 represent unique (Z)-phenylbutenoids, 3-6 are megastigmane glycosides, and 7 is identified as a rare bilobanone glycoside (Fig. 1). This study marks the first reported isolation of phenylbutenoid and bilobanone glycoside from G. biloba. The chemical structures of these compounds were elucidated through extensive spectroscopic analysis, including HR-ESI-MS and various 1D and 2D NMR experiments. Furthermore, the absolute configurations of these molecules were determined using Mosher's method, ECD experiments, and Cu-Kα X-ray crystallographic analyses.
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Affiliation(s)
- Zeshi Sun
- School of Pharmacy, Second Military Medical University, Shanghai 200433, China
| | - Shan Lin
- State Key Laboratory of New Drug and Pharmaceutical Process, Shanghai Institute of Pharmaceutical Industry, China State Institute of Pharmaceutical Industry, Shanghai 201203, China
| | - Zhi-Li Wu
- School of Pharmacy, Second Military Medical University, Shanghai 200433, China
| | - Hong-Yuan Dong
- School of Pharmacy, Second Military Medical University, Shanghai 200433, China
| | - Xi-Ke Xu
- School of Pharmacy, Second Military Medical University, Shanghai 200433, China
| | - Hui-Liang Li
- School of Pharmacy, Second Military Medical University, Shanghai 200433, China.
| | - Jinxin Wang
- School of Pharmacy, Second Military Medical University, Shanghai 200433, China.
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Ji HJ, Zhou XH, Wu HY, Liu HX, Zhang GZ. A bibliometric and thematic analysis of the trends in the research on ginkgo biloba extract from 1985 to 2022. Heliyon 2023; 9:e21214. [PMID: 37964856 PMCID: PMC10641152 DOI: 10.1016/j.heliyon.2023.e21214] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/02/2023] [Revised: 09/14/2023] [Accepted: 10/18/2023] [Indexed: 11/16/2023] Open
Abstract
Background Ginkgo biloba extract (GBE), a complementary and alternative medicine, has been widely used for disorders such as brain infarction, dementia, and coronary heart disease, in recent decades. Given its widespread clinical use, GBE has always been a vital research topic. However, there are no bibliometric analyses on this topic; furthermore, published reviews of GBE focus only on a specific research field or lack scientific and systematic evaluation. This study combined bibliometrics with thematic reviews by visual analysis to identify the current status of GBE research and to better identify research hotspots and trends in the past 40 years to understand future developments in basic and clinical research. Methods Articles and reviews on GBE were retrieved by topic from the Web of Science Core Collection from inception to 2022.12.01. Countries, institutions, authors, journals, references, and keywords in the field were visually analyzed using CiteSpace, Scimago Graphica, and VOSviewer software; then, these visualization results for references and keywords were clarified in detail by thematic reviews in subdivisions of the fields. Results In total, 2015 publications were included. The GBE-related literature has high volumes of publications and citations. The majority of literature is from China, and the USA cooperates most closely with other countries. In GBE research, Christen Yves is the most cited author, Phytotherapy Research is the most prolific journal, and the Journal of Ethnopharmacology is the most co-cited journal. Through a comprehensive analysis of keywords, references, and reviews, the quality of the meta-analysis of randomized controlled clinical trials of GBE in treating dementia was evaluated by the Risk of Bias in Systematic Reviews scale (ROBIS). Current research on GBE focuses on its pharmacological mechanisms, and neuroprotective application in diseases such as Alzheimer's disease, and glaucoma. Randomized controlled trials are the current research hotspot. Conclusion Research on GBE is flourishing; using bibliometric and thematic analysis, we identified its hotspots and trends. The pharmacological mechanisms and clinical applications of GBE are the focus of present and likely future research.
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Affiliation(s)
- Hong-Jian Ji
- School of Pharmacy, Jiangsu Vocational College of Medicine, Yancheng, 224005, Jiangsu, China
| | - Xiao-Hua Zhou
- Department of Internal Medicine, Yancheng School of Clinical Medicine of Nanjing Medical University, Yancheng, 224001, Jiangsu, China
| | - Hong-Yan Wu
- Institute of Medical Biotechnology, Jiangsu Vocational College of Medicine, Yancheng, 224005, Jiangsu, China
| | - Hong-Xia Liu
- School of Pharmacy, Jiangsu Vocational College of Medicine, Yancheng, 224005, Jiangsu, China
| | - Guo-Zhe Zhang
- School of Pharmacy, Jiangsu Vocational College of Medicine, Yancheng, 224005, Jiangsu, China
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Barbalho SM, Direito R, Laurindo LF, Marton LT, Guiguer EL, Goulart RDA, Tofano RJ, Carvalho ACA, Flato UAP, Capelluppi Tofano VA, Detregiachi CRP, Bueno PCS, Girio RSJ, Araújo AC. Ginkgo biloba in the Aging Process: A Narrative Review. Antioxidants (Basel) 2022; 11:525. [PMID: 35326176 PMCID: PMC8944638 DOI: 10.3390/antiox11030525] [Citation(s) in RCA: 16] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/10/2022] [Revised: 03/03/2022] [Accepted: 03/05/2022] [Indexed: 02/04/2023] Open
Abstract
Neurodegenerative diseases, cardiovascular disease (CVD), hypertension, insulin resistance, cancer, and other degenerative processes commonly appear with aging. Ginkgo biloba (GB) is associated with several health benefits, including memory and cognitive improvement, in Alzheimer's disease (AD), Parkinson's disease (PD), and cancer. Its antiapoptotic, antioxidant, and anti-inflammatory actions have effects on cognition and other conditions associated with aging-related processes, such as insulin resistance, hypertension, and cardiovascular conditions. The aim of this study was to perform a narrative review of the effects of GB in some age-related conditions, such as neurodegenerative diseases, CVD, and cancer. PubMed, Cochrane, and Embase databases were searched, and the PRISMA guidelines were applied. Fourteen clinical trials were selected; the studies showed that GB can improve memory, cognition, memory scores, psychopathology, and the quality of life of patients. Moreover, it can improve cerebral blood flow supply, executive function, attention/concentration, non-verbal memory, and mood, and decrease stress, fasting serum glucose, glycated hemoglobin, insulin levels, body mass index, waist circumference, biomarkers of oxidative stress, the stability and progression of atherosclerotic plaques, and inflammation. Therefore, it is possible to conclude that the use of GB can provide benefits in the prevention and treatment of aging-related conditions.
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Affiliation(s)
- Sandra Maria Barbalho
- Postgraduate Program in Structural and Functional Interactions in Rehabilitation, University of Marília (UNIMAR), Marília 17525-902, SP, Brazil; (E.L.G.); (R.d.A.G.); (R.J.T.); (A.C.A.C.); (U.A.P.F.); (C.R.P.D.); (P.C.S.B.); (A.C.A.)
- Department of Biochemistry and Pharmacology, School of Medicine, University of Marília (UNIMAR), Avenida Higino Muzzi Filho, 1001, Marília 17525-902, SP, Brazil; (L.F.L.); (L.T.M.); (V.A.C.T.)
- School of Food and Technology of Marilia (FATEC), Avenida Castro Alves, Marília 17500-000, SP, Brazil
| | - Rosa Direito
- Laboratory of Systems Integration Pharmacology, Clinical & Regulatory Science, Research Institute for Medicines (iMed.ULisboa), Faculdade de Farmácia, Universidade de Lisboa, Av. Prof. Gama Pinto, 1649-003 Lisbon, Portugal;
| | - Lucas Fornari Laurindo
- Department of Biochemistry and Pharmacology, School of Medicine, University of Marília (UNIMAR), Avenida Higino Muzzi Filho, 1001, Marília 17525-902, SP, Brazil; (L.F.L.); (L.T.M.); (V.A.C.T.)
| | - Ledyane Taynara Marton
- Department of Biochemistry and Pharmacology, School of Medicine, University of Marília (UNIMAR), Avenida Higino Muzzi Filho, 1001, Marília 17525-902, SP, Brazil; (L.F.L.); (L.T.M.); (V.A.C.T.)
| | - Elen Landgraf Guiguer
- Postgraduate Program in Structural and Functional Interactions in Rehabilitation, University of Marília (UNIMAR), Marília 17525-902, SP, Brazil; (E.L.G.); (R.d.A.G.); (R.J.T.); (A.C.A.C.); (U.A.P.F.); (C.R.P.D.); (P.C.S.B.); (A.C.A.)
- Department of Biochemistry and Pharmacology, School of Medicine, University of Marília (UNIMAR), Avenida Higino Muzzi Filho, 1001, Marília 17525-902, SP, Brazil; (L.F.L.); (L.T.M.); (V.A.C.T.)
- School of Food and Technology of Marilia (FATEC), Avenida Castro Alves, Marília 17500-000, SP, Brazil
| | - Ricardo de Alvares Goulart
- Postgraduate Program in Structural and Functional Interactions in Rehabilitation, University of Marília (UNIMAR), Marília 17525-902, SP, Brazil; (E.L.G.); (R.d.A.G.); (R.J.T.); (A.C.A.C.); (U.A.P.F.); (C.R.P.D.); (P.C.S.B.); (A.C.A.)
| | - Ricardo José Tofano
- Postgraduate Program in Structural and Functional Interactions in Rehabilitation, University of Marília (UNIMAR), Marília 17525-902, SP, Brazil; (E.L.G.); (R.d.A.G.); (R.J.T.); (A.C.A.C.); (U.A.P.F.); (C.R.P.D.); (P.C.S.B.); (A.C.A.)
- Department of Biochemistry and Pharmacology, School of Medicine, University of Marília (UNIMAR), Avenida Higino Muzzi Filho, 1001, Marília 17525-902, SP, Brazil; (L.F.L.); (L.T.M.); (V.A.C.T.)
| | - Antonely C. A. Carvalho
- Postgraduate Program in Structural and Functional Interactions in Rehabilitation, University of Marília (UNIMAR), Marília 17525-902, SP, Brazil; (E.L.G.); (R.d.A.G.); (R.J.T.); (A.C.A.C.); (U.A.P.F.); (C.R.P.D.); (P.C.S.B.); (A.C.A.)
| | - Uri Adrian Prync Flato
- Postgraduate Program in Structural and Functional Interactions in Rehabilitation, University of Marília (UNIMAR), Marília 17525-902, SP, Brazil; (E.L.G.); (R.d.A.G.); (R.J.T.); (A.C.A.C.); (U.A.P.F.); (C.R.P.D.); (P.C.S.B.); (A.C.A.)
- Department of Biochemistry and Pharmacology, School of Medicine, University of Marília (UNIMAR), Avenida Higino Muzzi Filho, 1001, Marília 17525-902, SP, Brazil; (L.F.L.); (L.T.M.); (V.A.C.T.)
| | - Viviane Alessandra Capelluppi Tofano
- Department of Biochemistry and Pharmacology, School of Medicine, University of Marília (UNIMAR), Avenida Higino Muzzi Filho, 1001, Marília 17525-902, SP, Brazil; (L.F.L.); (L.T.M.); (V.A.C.T.)
| | - Cláudia Rucco Penteado Detregiachi
- Postgraduate Program in Structural and Functional Interactions in Rehabilitation, University of Marília (UNIMAR), Marília 17525-902, SP, Brazil; (E.L.G.); (R.d.A.G.); (R.J.T.); (A.C.A.C.); (U.A.P.F.); (C.R.P.D.); (P.C.S.B.); (A.C.A.)
| | - Patrícia C. Santos Bueno
- Postgraduate Program in Structural and Functional Interactions in Rehabilitation, University of Marília (UNIMAR), Marília 17525-902, SP, Brazil; (E.L.G.); (R.d.A.G.); (R.J.T.); (A.C.A.C.); (U.A.P.F.); (C.R.P.D.); (P.C.S.B.); (A.C.A.)
- Department of Animal Sciences, School of Veterinary Medicine, University of Marília (UNIMAR), Avenida Higino Muzzi Filho 1001, Marília 17525-902, SP, Brazil;
| | - Raul S. J. Girio
- Department of Animal Sciences, School of Veterinary Medicine, University of Marília (UNIMAR), Avenida Higino Muzzi Filho 1001, Marília 17525-902, SP, Brazil;
| | - Adriano Cressoni Araújo
- Postgraduate Program in Structural and Functional Interactions in Rehabilitation, University of Marília (UNIMAR), Marília 17525-902, SP, Brazil; (E.L.G.); (R.d.A.G.); (R.J.T.); (A.C.A.C.); (U.A.P.F.); (C.R.P.D.); (P.C.S.B.); (A.C.A.)
- Department of Biochemistry and Pharmacology, School of Medicine, University of Marília (UNIMAR), Avenida Higino Muzzi Filho, 1001, Marília 17525-902, SP, Brazil; (L.F.L.); (L.T.M.); (V.A.C.T.)
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Noor-E-Tabassum, Das R, Lami MS, Chakraborty AJ, Mitra S, Tallei TE, Idroes R, Mohamed AAR, Hossain MJ, Dhama K, Mostafa-Hedeab G, Emran TB. Ginkgo biloba: A Treasure of Functional Phytochemicals with Multimedicinal Applications. EVIDENCE-BASED COMPLEMENTARY AND ALTERNATIVE MEDICINE : ECAM 2022; 2022:8288818. [PMID: 35265150 PMCID: PMC8901348 DOI: 10.1155/2022/8288818] [Citation(s) in RCA: 24] [Impact Index Per Article: 12.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 12/10/2021] [Accepted: 01/31/2022] [Indexed: 12/16/2022]
Abstract
Ginkgo biloba is an ancient plant species that is thought to provide a variety of health benefits to living organisms and contains plenty of bioactive components, making it a chemically diversified plant. G. biloba has been shown to have a variety of medicinal and pharmacological properties, including anticancer, antidementia, antidiabetic, antiobesity, antilipidemic, antimicrobial, antioxidant, antilipid peroxidation, antiplatelet, anti-inflammatory, hepatoprotective, antidepressant, antiaging, immunomodulatory, antihypertensive, and neuroprotective effects and is frequently used to treat neurological, cardiovascular, and respiratory diseases, such as tardive dyskinesia. Therefore, this review described the therapeutic applications of G. biloba. In addition to describing the therapeutic potential, this review also evaluates the chemical constituents, toxicity, adverse effect, synergistic effect, and the clinical studies of this plant which have been utilized for therapeutic benefits but have demonstrated other consequences. The capacity of G. biloba components to act as free radical scavengers is critical, and combining its extract with other plant extracts has been shown to synergistically boost antioxidant properties. G. biloba used long-term or at high doses that resulted in some adverse effects. Severe drug interactions have also been reported in both animals and humans when combined with other medications. The available data established from both preclinical and clinical studies confirm the potential of G. biloba plant extract in various diseases. Besides, the safety and efficacy of G. biloba continue to require verification through additional experimentation to guide medicinal use.
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Affiliation(s)
- Noor-E-Tabassum
- Department of Pharmacy, Faculty of Pharmacy, University of Dhaka, Dhaka 1000, Bangladesh
| | - Rajib Das
- Department of Pharmacy, Faculty of Pharmacy, University of Dhaka, Dhaka 1000, Bangladesh
| | - Mashia Subha Lami
- Department of Pharmacy, Faculty of Pharmacy, University of Dhaka, Dhaka 1000, Bangladesh
| | - Arka Jyoti Chakraborty
- Department of Pharmacy, Faculty of Pharmacy, University of Dhaka, Dhaka 1000, Bangladesh
| | - Saikat Mitra
- Department of Pharmacy, Faculty of Pharmacy, University of Dhaka, Dhaka 1000, Bangladesh
| | - Trina Ekawati Tallei
- Department of Biology, Faculty of Mathematics and Natural Sciences, Sam Ratulangi University, Manado 95115, North Sulawesi, Indonesia
- The University Centre of Excellence for Biotechnology and Conservation of Wallacea, Institute for Research and Community Services, Sam Ratulangi University, Manado 95115, North Sulawesi, Indonesia
| | - Rinaldi Idroes
- Department of Pharmacy, Faculty of Mathematics and Natural Sciences, Universitas Syiah Kuala, Kopelma Darussalam, Banda Aceh 23111, Indonesia
| | | | - Md. Jamal Hossain
- Department of Pharmacy, State University of Bangladesh, 77 Satmasjid Road, Dhanmondi, Dhaka 1205, Bangladesh
| | - Kuldeep Dhama
- Division of Pathology, ICAR-Indian Veterinary Research Institute, Izatnagar, Bareilly 243122, Uttar Pradesh, India
| | - Gomaa Mostafa-Hedeab
- Pharmacology Department, Health Sciences Research Unit, Medical College, Jouf University, Sakaka, Saudi Arabia
| | - Talha Bin Emran
- Department of Pharmacy, BGC Trust University Bangladesh, Chittagong 4381, Bangladesh
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Siritientong T, Thet D, Methaneethorn J, Leelakanok N. Pharmacokinetic Outcomes of the Interactions of Antiretroviral Agents with Food and Supplements: A Systematic Review and Meta-Analysis. Nutrients 2022; 14:520. [PMID: 35276881 PMCID: PMC8840371 DOI: 10.3390/nu14030520] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/16/2021] [Revised: 01/19/2022] [Accepted: 01/23/2022] [Indexed: 12/04/2022] Open
Abstract
Because pharmacokinetic changes in antiretroviral drugs (ARV), due to their concurrent administration with food or nutritional products, have become a clinical challenge, it is necessary to monitor the therapeutic efficacy of ARV in people living with the human immunodeficiency virus (PLWH). A systematic review and meta-analysis were conducted to clarify the pharmacokinetic outcomes of the interaction between supplements such as food, dietary supplements, and nutrients, and ARV. Twenty-four articles in both healthy subjects and PLWH were included in the qualitative analysis, of which five studies were included in the meta-analysis. Food−drug coadministration significantly increased the time to reach maximum concentration (tmax) (p < 0.00001) of ARV including abacavir, amprenavir, darunavir, emtricitabine, lamivudine, zidovudine, ritonavir, and tenofovir alafenamide. In addition, the increased maximum plasma concentration (Cmax) of ARV, such as darunavir, under fed conditions was observed. Area under the curve and terminal half-life were not significantly affected. Evaluating the pharmacokinetic aspects, it is vital to clinically investigate ARV and particular supplement interaction in PLWH. Educating patients about any potential interactions would be one of the effective recommendations during this HIV epidemic.
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Affiliation(s)
- Tippawan Siritientong
- Department of Food and Pharmaceutical Chemistry, Faculty of Pharmaceutical Sciences, Chulalongkorn University, Bangkok 10330, Thailand;
- Center of Excellence in Burn and Wound Care, Chulalongkorn University, Bangkok 10330, Thailand
| | - Daylia Thet
- Department of Food and Pharmaceutical Chemistry, Faculty of Pharmaceutical Sciences, Chulalongkorn University, Bangkok 10330, Thailand;
| | - Janthima Methaneethorn
- Pharmacokinetic Research Unit, Department of Pharmacy Practice, Faculty of Pharmaceutical Sciences, Naresuan University, Phitsanulok 65000, Thailand;
- Center of Excellence for Environmental Health and Toxicology, Naresuan University, Phitsanulok 65000, Thailand
| | - Nattawut Leelakanok
- Department of Clinical Pharmacy, Faculty of Pharmaceutical Sciences, Burapha University, Chonburi 20131, Thailand;
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Kushwah N, Jain V, Kadam M, Kumar R, Dheer A, Prasad D, Kumar B, Khan N. Ginkgo biloba L. Prevents Hypobaric Hypoxia-Induced Spatial Memory Deficit Through Small Conductance Calcium-Activated Potassium Channel Inhibition: The Role of ERK/CaMKII/CREB Signaling. Front Pharmacol 2021; 12:669701. [PMID: 34326768 PMCID: PMC8313424 DOI: 10.3389/fphar.2021.669701] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/19/2021] [Accepted: 06/14/2021] [Indexed: 01/02/2023] Open
Abstract
Hypobaric hypoxia (HH) is a stressful condition, which is more common at high altitudes and can impair cognitive functions. Ginkgo biloba L. leaf extract (GBE) is widely used as herbal medicine against different disorders. Its ability to improve cognitive functions, reduce oxidative stress, and promote cell survival makes it a putative therapeutic candidate against HH. The present study has been designed to explore the effect of GBE on HH-induced neurodegeneration and memory impairment as well as possible signaling mechanisms involved. 220–250 gm (approximately 6- to 8-week-old) Sprague Dawley rats were randomly divided into different groups. GBE was orally administered to respective groups at a dose of 100 mg/kg/day throughout the HH exposure, i.e., 14 days. Memory testing was performed followed by hippocampus isolation for further processing of different molecular and morphological parameters related to cognition. The results indicated that GBE ameliorates HH-induced memory impairment and oxidative damage and reduces apoptosis. Moreover, GBE modulates the activity of the small conductance calcium-activated potassium channels, which further reduces glutamate excitotoxicity and apoptosis. The exploration of the downstream signaling pathway demonstrated that GBE administration prevents HH-induced small conductance calcium-activated potassium channel activation, and that initiates pro-survival machinery by activating extracellular signal–regulated kinase (ERK)/calmodulin-dependent protein kinase II (CaMKII) and the cAMP response element–binding protein (CREB) signaling pathway. In summary, the current study demonstrates the beneficial effect of GBE on conditions like HH and provides various therapeutic targets involved in the mechanism of action of GBE-mediated neuroprotection.
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Affiliation(s)
- Neetu Kushwah
- Department of Neurobiology, Defence Institute of Physiology and Allied Sciences (DIPAS), DRDO, Delhi, India
| | - Vishal Jain
- Department of Neurophysiology, Defence Institute of Physiology and Allied Sciences (DIPAS), DRDO, Delhi, India
| | - Manisha Kadam
- Department of Neurobiology, Defence Institute of Physiology and Allied Sciences (DIPAS), DRDO, Delhi, India
| | - Rahul Kumar
- Department of Neurobiology, Defence Institute of Physiology and Allied Sciences (DIPAS), DRDO, Delhi, India
| | - Aastha Dheer
- Department of Neurobiology, Defence Institute of Physiology and Allied Sciences (DIPAS), DRDO, Delhi, India
| | - Dipti Prasad
- Department of Neurobiology, Defence Institute of Physiology and Allied Sciences (DIPAS), DRDO, Delhi, India
| | - Bhuvnesh Kumar
- Department of Neurobiology, Defence Institute of Physiology and Allied Sciences (DIPAS), DRDO, Delhi, India.,Department of Neurophysiology, Defence Institute of Physiology and Allied Sciences (DIPAS), DRDO, Delhi, India
| | - Nilofar Khan
- Department of Neurobiology, Defence Institute of Physiology and Allied Sciences (DIPAS), DRDO, Delhi, India
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Eisvand F, Razavi BM, Hosseinzadeh H. The effects of
Ginkgo biloba
on metabolic syndrome: A review. Phytother Res 2020; 34:1798-1811. [DOI: 10.1002/ptr.6646] [Citation(s) in RCA: 29] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/19/2019] [Revised: 12/22/2019] [Accepted: 01/31/2020] [Indexed: 02/06/2023]
Affiliation(s)
- Farhad Eisvand
- Department of Pharmacodynamics and Toxicology, School of PharmacyMashhad University of Medical Sciences Mashhad Iran
| | - Bibi Marjan Razavi
- Department of Pharmacodynamics and Toxicology, School of PharmacyMashhad University of Medical Sciences Mashhad Iran
- Targeted Drug Delivery Research Center, Pharmaceutical Technology InstituteMashhad University of Medical Sciences Mashhad Iran
| | - Hossein Hosseinzadeh
- Department of Pharmacodynamics and Toxicology, School of PharmacyMashhad University of Medical Sciences Mashhad Iran
- Pharmaceutical Research Center, Pharmaceutical Technology InstituteMashhad University of Medical Sciences Mashhad Iran
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Ren XJ, Yang ZB, Ding X, Yang CW. Effects of Ginkgo biloba leaves (Ginkgo biloba) and Ginkgo biloba extract on nutrient and energy utilization of broilers. Poult Sci 2018; 97:1342-1351. [PMID: 29462375 DOI: 10.3382/ps/pex445] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/26/2017] [Accepted: 01/02/2018] [Indexed: 01/12/2023] Open
Abstract
An experiment using 112 21-day-old male Arbor Acres broilers that were randomly allocated to 7 treatments with 8 replicates in a completely randomized design was conducted to assess the effects of Ginkgo biloba leaves (Ginkgo biloba, GL) and Ginkgo biloba extract (EGB) on utilization of nutrients of broiler chickens. The dietary treatments were corn-soybean meal based diets: 1) T1, control diet; 2) T2, T1 + 20 g/kg GL; 3) T3, T1 + 40 g/kg GL; 4) T4, T1 + 60 g/kg GL; 5) T5, T1 + 0.4 g/kg EGB; 6) T6, T1 + 0.8 g/kg EGB; and 7) T7, T1 + 1.2 g/kg EGB. Endogenous losses were obtained from another 16 broilers. Excreta samples were collected to analyze the dry matter (DM), organic matter (OM), ether extract (EE), crude protein (CP), gross energy (GE), and amino acids (AA), and GE was analyzed for computation of AME and TME. As compared with those of the control treatment, the apparent digestibility (AD) and true digestibility (TD) of EE, CP, Thr, Val, Ile, Leu, Phe, Lys, His, and Arg were quadratically (P < 0.05) increased; moreover, the AD and TD of Met was linearly (P < 0.05) increased as the concentration of the EGB in the diet increased. Increasing GL from 0 to 60 g/kg of diet linearly (P < 0.05) increased the AD and TD of EE, Thr, Val, Leu, His, and Met and tended (0.05 < P < 0.1) to increase the TME, TMEn, and Arg. Supplementation of EGB increased (P < 0.05) AD and TD of EE, Thr, Val, Ile, Leu, Phe, His, and Arg and tended (0.05 < P < 0.1) to increase Lys as compared with those in the GL-supplemented groups. Dietary supplementation of GL and EGB improved the utilization of nutrients of broiler chickens in a dose-dependent manner, and the optimum supplementation levels of GL or EGB in the diet of broilers was 60 or 0.8 g/kg of diet, respectively.
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Affiliation(s)
- X J Ren
- Department of Animal Science and Technology, Shandong Provincial Key Laboratory of Animal Biotechnology and Disease Control and Prevention, Shandong Agricultural University, 61 Daizong Street, Taian, Shandong, P. R. China, 271018
| | - Z B Yang
- Department of Animal Science and Technology, Shandong Provincial Key Laboratory of Animal Biotechnology and Disease Control and Prevention, Shandong Agricultural University, 61 Daizong Street, Taian, Shandong, P. R. China, 271018
| | - X Ding
- Department of Animal Science and Technology, Shandong Provincial Key Laboratory of Animal Biotechnology and Disease Control and Prevention, Shandong Agricultural University, 61 Daizong Street, Taian, Shandong, P. R. China, 271018
| | - C W Yang
- College of Life Science, Shandong Agricultural University, Taian, Shandong, P. R. China, 271018
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Nobutani K, Miyoshi J, Musch MW, Nishiyama M, Watanabe J, Kaneko A, Yamamoto M, Yoshida M, Kono T, Jeong H, Chang EB. Daikenchuto (TU-100) alters murine hepatic and intestinal drug metabolizing enzymes in an in vivo dietary model: effects of gender and withdrawal. Pharmacol Res Perspect 2018; 5. [PMID: 28971602 PMCID: PMC5625165 DOI: 10.1002/prp2.361] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/19/2017] [Revised: 08/15/2017] [Accepted: 08/21/2017] [Indexed: 12/16/2022] Open
Abstract
Herbal medicines and natural products used for maintenance of health or treatment of diseases have many biological effects, including altering the pharmacokinetics and metabolism of other medications. Daikenchuto (TU‐100), an aqueous extract of ginger, ginseng, and Japanese green pepper fruit, is a commonly prescribed Kampo (Japanese herbal medicine) for postoperative ileus or bloating. The effects of TU‐100 on drug metabolism have not been investigated. In this study, we analyzed the effect of TU‐100 on expression of key drug‐metabolizing enzymes (DMEs) and drug transporters (DTs) in murine liver and gastrointestinal tract using a dietary model. Liver, jejunum, and proximal colon were analyzed for phase I and II DMEs and DT mRNA expression by reverse transcription (RT) first by nonquantitative and followed by quantitative polymerase chain reaction (PCR) and protein expression. Liver, jejunum, and proximal colon expressed some identical but also unique DMEs and DTs. TU‐100 increased the greatest changes in cytochrome (Cyp) 2b10 and Cyp3a11 and Mdr1a. Basal and TU‐100 stimulated levels of DME and DT expression were gender‐dependent, dose‐dependent and reversible after cessation of TU‐100 supplementation, except for some changes in the intestine. Quantitative Western blot analysis of protein extracts confirmed the quantitative PCR results.
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Affiliation(s)
- Kentaro Nobutani
- Department of Medicine, Knapp Center for Biomedical Center, The University of Chicago, Chicago, Illinois
| | - Jun Miyoshi
- Department of Medicine, Knapp Center for Biomedical Center, The University of Chicago, Chicago, Illinois
| | - Mark W Musch
- Department of Medicine, Knapp Center for Biomedical Center, The University of Chicago, Chicago, Illinois
| | - Mitsue Nishiyama
- Tsumura Research Laboratories, Tsumura & Co., Ami, Ibaraki, Japan
| | - Junko Watanabe
- Tsumura Research Laboratories, Tsumura & Co., Ami, Ibaraki, Japan
| | - Atsushi Kaneko
- Tsumura Research Laboratories, Tsumura & Co., Ami, Ibaraki, Japan
| | | | - Masaru Yoshida
- Division of Gastroenterology, Department of Internal Medicine, Kobe University Graduate School of Medicine, Kobe, Hyogo, Japan
| | - Toru Kono
- Center for Clinical and Biomedical Research, Sapporo Higashi Tokushukai Hospital, Sapporo, Hokkaido, Japan.,Division of Gastroenterologic and General Surgery, Department of Surgery, Asahikawa Medical University, Asahikawa, Hokkaido, Japan
| | - Hyunyoung Jeong
- Departments of Pharmacy Practice and Biopharmaceutical Sciences, College of Pharmacy, University of Illinois, Chicago, Illinois
| | - Eugene B Chang
- Department of Medicine, Knapp Center for Biomedical Center, The University of Chicago, Chicago, Illinois
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Development of an ultra-fast liquid chromatography–tandem mass spectrometry method for simultaneous determination of seven flavonoids in rat plasma: Application to a comparative pharmacokinetic investigation of Ginkgo biloba extract and single pure ginkgo flavonoids after oral administration. J Chromatogr B Analyt Technol Biomed Life Sci 2017. [DOI: 10.1016/j.jchromb.2017.05.021] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
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12
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Turkanovic J, Ward MB, Gerber JP, Milne RW. Effect of Garlic, Gingko, and St. John's Wort Extracts on the Pharmacokinetics of Fexofenadine: A Mechanistic Study. Drug Metab Dispos 2017; 45:569-575. [PMID: 28188296 DOI: 10.1124/dmd.116.073528] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/20/2016] [Accepted: 02/06/2017] [Indexed: 11/22/2022] Open
Abstract
The aim of this study was to determine the effects of garlic and ginkgo herbal extracts on the pharmacokinetics of the P-glycoprotein (P-gp)/organic anion-transporting polypeptides (Oatps) substrate fexofenadine. Male rats were dosed orally with garlic (120 mg/kg), ginkgo (17 mg/kg), St. John's wort (SJW; 1000 mg/kg; positive control), or Milli-Q water for 14 days. On day 15, rats either were administered fexofenadine (orally or i.v.), had their livers isolated and perfused with fexofenadine, or had their small intestines divided into four segments (SI-SIV) and analyzed for P-gp and Oatp1a5. In vivo, SJW increased the clearance of i.v. administered fexofenadine by 28%. Garlic increased the area under the curve0-∞ and maximum plasma concentration of orally administered fexofenadine by 47% and 85%, respectively. Ginkgo and SJW had no effect on the oral absorption of fexofenadine. In the perfused liver, garlic, ginkgo, and SJW increased the biliary clearance of fexofenadine with respect to perfusate by 71%, 121%, and 234%, respectively. SJW increased the biliary clearance relative to the liver concentration by 64%. The ratio of liver to perfusate concentrations significantly increased in all treated groups. The expression of Oatp1a5 in SI was increased by garlic (88%) and SJW (63%). There were no significant changes in the expression of P-gp. Induction of intestinal Oatp1a5 by garlic may explain the increased absorption of orally administered fexofenadine. Ginkgo had no effect on the expression of intestinal P-gp or Oatp1a5. A dual inductive effect by SJW on opposing intestinal epithelial transport by Oatp1a5 and P-gp remains a possibility.
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Affiliation(s)
- Jasmina Turkanovic
- School of Pharmacy and Medical Sciences, University of South Australia, Adelaide, Australia
| | - Michael B Ward
- School of Pharmacy and Medical Sciences, University of South Australia, Adelaide, Australia
| | - Jacobus P Gerber
- School of Pharmacy and Medical Sciences, University of South Australia, Adelaide, Australia
| | - Robert W Milne
- School of Pharmacy and Medical Sciences, University of South Australia, Adelaide, Australia
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Bo L, Baosheng Z, Yang L, Mingmin T, Beiran L, Zhiqiang L, Huaqiang Z. Herb-drug enzyme-mediated interactions and the associated experimental methods: a review. J TRADIT CHIN MED 2016; 36:392-408. [DOI: 10.1016/s0254-6272(16)30054-1] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
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Ma BL, Ma YM. Pharmacokinetic herb–drug interactions with traditional Chinese medicine: progress, causes of conflicting results and suggestions for future research. Drug Metab Rev 2016; 48:1-26. [DOI: 10.3109/03602532.2015.1124888] [Citation(s) in RCA: 38] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
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Ye N, Wang H, Hong J, Zhang T, Lin C, Meng C. PXR Mediated Protection against Liver Inflammation by Ginkgolide A in Tetrachloromethane Treated Mice. Biomol Ther (Seoul) 2016; 24:40-8. [PMID: 26759700 PMCID: PMC4703351 DOI: 10.4062/biomolther.2015.077] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/11/2015] [Revised: 07/11/2015] [Accepted: 10/02/2015] [Indexed: 12/16/2022] Open
Abstract
The pregnane X receptor (PXR), a liver and intestine specific receptor,, has been reported to be related with the repression of inflammation as well as activation of cytochromosome P450 3A (CYP3A) expression. We examined the effect of PXR on tetrachloromethane (CCl4)-induced mouse liver inflammation in this work. Ginkgolide A, one main component of Ginkgo biloba extracts (GBE), activated PXR and enhanced PXR expression level, displayed both significant therapeutic effect and preventive effect against CCl4-induced mouse hepatitis. siRNA-mediated decrease of PXR expression significantly reduced the efficacy of Ginkgolide A in treating CCl4-induced inflammation in mice. Flavonoids, another important components of GBE, were shown anti-inflammatory effect in a different way from Ginkgolide A which might be independent on PXR because flavonoids significantly inhibited CYP3A11 activities in mice. The results indicated that anti-inflammatory effect of PXR might be mediated by enhancing transcription level of IκBα through binding of IκBα. Inhibition of NF-κB activity by NF-κB-specific suppressor IκBα is one of the potential mechanisms of Ginkgolide A against CCl4-induced liver inflammation.
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Affiliation(s)
- Nanhui Ye
- Institute of Pharmaceutical Biotechnology and Engineering, College of Biological Science and Biotechnology, Fuzhou University, Fuzhou, Fujian, 350108, China
| | - Hang Wang
- Institute of Pharmaceutical Biotechnology and Engineering, College of Biological Science and Biotechnology, Fuzhou University, Fuzhou, Fujian, 350108, China
| | - Jing Hong
- Institute of Pharmaceutical Biotechnology and Engineering, College of Biological Science and Biotechnology, Fuzhou University, Fuzhou, Fujian, 350108, China
| | - Tao Zhang
- Institute of Pharmaceutical Biotechnology and Engineering, College of Biological Science and Biotechnology, Fuzhou University, Fuzhou, Fujian, 350108, China
| | - Chaotong Lin
- Institute of Pharmaceutical Biotechnology and Engineering, College of Biological Science and Biotechnology, Fuzhou University, Fuzhou, Fujian, 350108, China
| | - Chun Meng
- Institute of Pharmaceutical Biotechnology and Engineering, College of Biological Science and Biotechnology, Fuzhou University, Fuzhou, Fujian, 350108, China
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Muthiah YD, Ong CE, Sulaiman SA, Ismail R. Inhibition of Human Cytochrome P450 2c8-catalyzed Amodiaquine N-desethylation: Effect of Five Traditionally and Commonly Used Herbs. Pharmacognosy Res 2016; 8:292-297. [PMID: 27695271 PMCID: PMC5004522 DOI: 10.4103/0974-8490.188886] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022] Open
Abstract
Background: In Southeast Asia and many parts of the world, herbal products are increasingly used in parallel with modern medicine. Objective: This study aimed to investigate the effects of herbs commonly used in Southeast Asia on activity of cytochrome P450 2C8 (CYP2C8), an important human hepatic enzyme in drug metabolism. Materials and Methods: The selected herbs, such as Eurycoma longifolia Jack (ELJ), Labisia pumila (LP), Echinacea purpurea (EP), Andrographis paniculata (AP), and Ginkgo biloba (GB), were subjected to inhibition studies using an in vitro CYP2C8 activity marker, amodiaquine N-desethylase assay. Inhibition parameters, inhibitory concentration 50% (IC50), and Ki values were determined to study the potency and mode of inhibition. Results: All herbs inhibited CYP2C8 with the following order of potency: LP > ELJ > GB > AP > EP. LP and ELJ inhibited potently at Ki's of 2 and 4 times the Ki of quercetin, the positive control. The inhibition by LP was uncompetitive in nature as compared to competitive or mixed type inhibition observed with other herbs. GB exhibited moderate inhibitory effect at a Ki6 times larger than quercetin Ki. AP and EP, on the other hand, showed only weak inhibition. Conclusion: The herbs we chose represented the more commonly used herbs in Southeast Asia where collision of tradition and modernization in healthcare, if not properly managed, may lead to therapeutic misadventures. We conclude that concurrent consumption of some herbs, in particular, LP and ELJ, may have relevance in drug-herb interactions via CYP2C8 inhibition in vivo. SUMMARY Herbs are increasingly used in parallel with modern medicines nowadays. In this study five commonly used herbs in Southeast Asia region, ELJ, LP, EP, AP and GB, were investigated for their in vitro inhibitory potency on CYP2C8, an important drug-metaboliz-ing human hepatic enzyme. All herbs inhibited CYP2C8 activity marker, amodiaquine N-desethylation, with potency order of LP > ELJ > GB >AP > EP. LP, ELJ and GB exhibited Ki values of 2, 4 and 6 times the Ki of quercetin, the positive control, indicating potent to moderate degree of enzyme inhibition. AP and EP, on the other hand, showed only weak inhibition. In summary, concurrent consumption of some herbs especially LP and ELJ may have relevance in drug-herb interactions via CYP2C8 inhibition in vivo.
Abbreviations Used: AQ: Amodiaquine, AP: Andrographis paniculata, CYP: Cytochrome P450, DEAQ: Desethylamodiaquine, EP: Echinacea purpurea, ELJ: Eurycoma longifolia Jack, GB: Ginkgo biloba, Ki: Inhibition constant, LP: Labisia pumila, Vmax: Maximal velocity, Km: Michaelis-Menten constant.
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Affiliation(s)
- Yasotha Devi Muthiah
- Pharmacogenetics Research Group, Institute for Research in Molecular Medicine, Universiti Sains, Malaysia
| | - Chin Eng Ong
- School of Pharmacy, Monash University, 47500 Bandar Sunway, Selangor, Malaysia
| | - Siti Amrah Sulaiman
- Department of Pharmacology, School of Medical Sciences, Universiti Sains, 16150 Kubang Kerian, Kelantan, Malaysia
| | - Rusli Ismail
- Centre of Excellence for Research in AIDS, Universiti Malaya, 59990 Kuala Lumpur, Malaysia
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Pharmacokinetic interactions of herbs with cytochrome p450 and p-glycoprotein. EVIDENCE-BASED COMPLEMENTARY AND ALTERNATIVE MEDICINE 2015; 2015:736431. [PMID: 25632290 PMCID: PMC4302358 DOI: 10.1155/2015/736431] [Citation(s) in RCA: 61] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 07/31/2014] [Revised: 12/20/2014] [Accepted: 12/20/2014] [Indexed: 11/17/2022]
Abstract
The concurrent use of drugs and herbal products is becoming increasingly prevalent over the last decade. Several herbal products have been known to modulate cytochrome P450 (CYP) enzymes and P-glycoprotein (P-gp) which are recognized as representative drug metabolizing enzymes and drug transporter, respectively. Thus, a summary of knowledge on the modulation of CYP and P-gp by commonly used herbs can provide robust fundamentals for optimizing CYP and/or P-gp substrate drug-based therapy. Herein, we review ten popular medicinal and/or dietary herbs as perpetrators of CYP- and P-gp-mediated pharmacokinetic herb-drug interactions. The main focus is placed on previous works on the ability of herbal extracts and their phytochemicals to modulate the expression and function of CYP and P-gp in several in vitro and in vivo animal and human systems.
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Heinonen T, Gaus W. Cross matching observations on toxicological and clinical data for the assessment of tolerability and safety of Ginkgo biloba leaf extract. Toxicology 2015; 327:95-115. [DOI: 10.1016/j.tox.2014.10.013] [Citation(s) in RCA: 39] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/20/2014] [Revised: 10/13/2014] [Accepted: 10/27/2014] [Indexed: 12/22/2022]
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Wei T, Xiong FF, Wang SD, Wang K, Zhang YY, Zhang QH. Flavonoid ingredients of Ginkgo biloba leaf extract regulate lipid metabolism through Sp1-mediated carnitine palmitoyltranferase 1A up-regulation. J Biomed Sci 2014; 21:87. [PMID: 25183267 PMCID: PMC4428510 DOI: 10.1186/s12929-014-0087-x] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/24/2014] [Accepted: 08/21/2014] [Indexed: 01/03/2023] Open
Abstract
BACKGROUND Lipid accumulation is the primary evidence of non-alcoholic fatty liver disease (NAFLD). Ginkgo biloba extract (GBE) and its flavonoid ingredients (quercetin, kaempferol, and isorhamnetin) could lessen the lipid accumulation associated with up-regulation of the rate-limiting enzyme, carnitine palmitoyltransferase 1A (CPT1A), in the β-oxidation of long-chain fatty acids. In this study, we investigated the mechanisms by which GBE and its flavonoids induced expression of CPT1A. RESULTS CPT1A inhibition with RNAi resulted in triglyceride accumulation in HepG2 cells. Through deletion and mutation analysis of CPT1A's promoter combined with electrophoretic mobility shift assay (EMSA) and chromatin immunoprecipitation (ChIP) experiments, the CPT1A promoter region (-50 to -5 nt) was determined to contain two putative Sp1 binding sites, namely Sp1a and Sp1b, which might act as the GBE regulation response DNA element. Sp1 might be induced to transfer from cytoplasma to nucleus to bind the promoter region of -50 to -5 nt by GBE. The regulatory effects of GBE on CPT1A were also verified on the flavonoid ingredients quercetin, kaempferol, and isorhamnetin. CONCLUSION Sp1 was crucial in regulating CPT1A expression with GBE and its flavonoid ingredients, and the -50 to -5 nt region of CPT1A promoter played important roles in Sp1 binding.
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Affiliation(s)
- Ting Wei
- Research Center for Traditional Chinese Medicine and Systems Biology, Shanghai University of Traditional Chinese Medicine, Shanghai, China.
- Shanghai-MOST Key Laboratory of Health and Disease Genomics, National Engineering Center for Biochip at Shanghai, Shanghai, China.
| | - Fei-fei Xiong
- School of Life Science and Technology, Tongji University, Shanghai, China.
- Shanghai-MOST Key Laboratory of Health and Disease Genomics, National Engineering Center for Biochip at Shanghai, Shanghai, China.
| | - Shi-dong Wang
- Research Center for Traditional Chinese Medicine and Systems Biology, Shanghai University of Traditional Chinese Medicine, Shanghai, China.
- Shanghai-MOST Key Laboratory of Health and Disease Genomics, National Engineering Center for Biochip at Shanghai, Shanghai, China.
| | - Ke Wang
- Shanghai-MOST Key Laboratory of Health and Disease Genomics, National Engineering Center for Biochip at Shanghai, Shanghai, China.
| | - Yong-yu Zhang
- Research Center for Traditional Chinese Medicine and Systems Biology, Shanghai University of Traditional Chinese Medicine, Shanghai, China.
| | - Qing-hua Zhang
- Research Center for Traditional Chinese Medicine and Systems Biology, Shanghai University of Traditional Chinese Medicine, Shanghai, China.
- School of Life Science and Technology, Tongji University, Shanghai, China.
- Shanghai-MOST Key Laboratory of Health and Disease Genomics, National Engineering Center for Biochip at Shanghai, Shanghai, China.
- State Key Laboratory of Medical Genomics and Shanghai Institute of Hematology, Ruijin Hospital, Shanghai Jiaotong University School of Medicine, Shanghai, China.
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Hu M, Fan L, Zhou HH, Tomlinson B. Theranostics meets traditional Chinese medicine: rational prediction of drug–herb interactions. Expert Rev Mol Diagn 2014; 12:815-30. [DOI: 10.1586/erm.12.126] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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Ude C, Schubert-Zsilavecz M, Wurglics M. Ginkgo biloba Extracts: A Review of the Pharmacokinetics of the Active Ingredients. Clin Pharmacokinet 2013; 52:727-49. [DOI: 10.1007/s40262-013-0074-5] [Citation(s) in RCA: 159] [Impact Index Per Article: 14.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Yasui-Furukori N, Furukori H, Kaneda A, Kaneko S, Tateishi T. The Effects ofGinkgo bilobaExtracts on the Pharmacokinetics and Pharmacodynamics of Donepezil. J Clin Pharmacol 2013; 44:538-42. [PMID: 15102875 DOI: 10.1177/0091270004264161] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
The effects of ginkgo supplementation on the steady-state plasma concentration of donepezil and the activity of cholinesterase in red blood cells and cognitive function were examined. Fourteen inpatients with Alzheimer's disease received donepezil 5 mg/day, supplemented with extracts of Ginkgo biloba 90 mg/day for 30 days. Blood samples were collected before and during ginkgo supplementation and 30 days after its discontinuation, together with an assessment of cognitive function. Plasma drug concentration was measured using high-performance liquid chromatography (HPLC), and cholinesterase in red blood cells was measured using Ellman methods. Cognitive function was evaluated using the Mini-Mental Scale Examination (MMSE). Plasma concentration of donepezil during ginkgo supplementation (mean +/- SD [95% confidence interval]; 24.4 +/- 12.6 ng/mL [17.1-31.7 ng/mL]) was not significantly different from that before ginkgo supplementation (22.7 +/- 10.3 ng/mL [16.8-28.7 ng/mL]) or that 4 weeks after its discontinuation (25.0 +/- 12.9 ng/mL [17.6-32.4 ng/mL]). There was no significant difference between cholinesterase in red blood cells before ginkgo supplementation (1.75 +/- 0.21 U [1.63-1.87 U]), during ginkgo supplementation (1.91 +/- 0.27 U [1.76-2.07 U]), and 4 weeks after its discontinuation (1.83 +/- 0.29 U [1.66-2.00 U]). Ginkgo supplementation did not alter MMSE scores throughout the study. The present study shows that ginkgo supplementation does not have major impact on the pharmacokinetics and pharmacodynamics of donepezil.
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Affiliation(s)
- Norio Yasui-Furukori
- Department of Clinical Pharmacology, Hirosaki University School of Medicine, Hirosaki 036-8562, Japan
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Wang SD, Xie ZQ, Chen J, Wang K, Wei T, Zhao AH, Zhang QH. Inhibitory effect of Ginkgo biloba extract on fatty liver: regulation of carnitine palmitoyltransferase 1a and fatty acid metabolism. J Dig Dis 2012; 13:525-35. [PMID: 22988926 DOI: 10.1111/j.1751-2980.2012.00627.x] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
OBJECTIVE To investigate the potential effect of Ginkgo biloba extract (GBE) on the prevention and treatment of nonalcoholic fatty liver disease (NAFLD). METHODS Male Wistar rats were divided into 4 groups (the control group, GBE group, high-fat diet [HFD] group and HFD + GBE group). The human hepatocellular carcinoma cell line (HepG2) was treated with GBE and its flavonoid ingredients. The fatty acid composition of the rat liver was analyzed with gas chromatography/time-of-flight mass spectrometry (GC/TOFMS). Triglyceride contents of both the rat liver and HepG2 cells were measured by enzymatic colorimetric method. The expressions of fatty acid metabolism-related genes were analyzed with real-time reverse transcription-polymerase chain reaction (RT-PCR). The protein expression and enzymatic activity were subsequently measured. RESULTS In rat livers, GBE reduced the elevations of hepatic triglyceride contents caused by HFD and the increased hepatic fatty acids were differentially affected by GBE. Notably, the expression and total activity of the fatty acid β-oxidation rate-limiting enzyme, carnitine palmitoyltransferase 1a (CPT1A), were also promoted with GBE ingestion. In HepG2 cells, GBE and its ingredients, quercetin, kaempferol and isorhamnetin, could decrease the cellular triglyceride content and upregulate the expression and total activity of CPT1A, respectively. CONCLUSIONS The triglyceride-lowering effect of GBE on the HFD rat liver is closely associated with the increased expression and activity of CPT1A, and the flavonoid ingredients are the major contributors of GBE.
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Affiliation(s)
- Shi Dong Wang
- Center for Chinese Medical Therapy and Systems Biology, Shanghai University of Traditional Chinese Medicine, Shanghai, China
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Taki Y, Hagiwara E, Hirose C, Shinozuka K, Umegaki K, Yamada S. Effects of Ginkgo biloba extract on the pharmacokinetics and pharmacodynamics of tolbutamide in protein-restricted rats. J Pharm Pharmacol 2011; 63:1238-43. [DOI: 10.1111/j.2042-7158.2011.01327.x] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
Abstract
Objectives
Effects of repeated administration of Ginkgo biloba extract on pharmacokinetics and pharmacodynamics of tolbutamide were examined in rats fed a low-protein diet.
Methods
Rats were given a low (7% casein) or control (20% casein) protein diet for 21 days and administered Ginkgo biloba extract (100 mg/kg per day) for the last 5 days. Tolbutamide was co-administered on the last day. Blood glucose and plasma tolbutamide concentrations were determined over the subsequent 12 h and the activity of hepatic cytochrome P450s were determined at 12 h after dosing.
Key findings
There were significant decreases in body weight, the ratio of liver to body weight, and plasma albumin concentrations in rats on the low-protein diet compared with controls. The hypoglycaemic effect of tolbutamide was significantly greater and the concentration of the drug in plasma was higher in the former group. The repeated administration of Ginkgo biloba extract had little influence on the hypoglycaemic effect of tolbutamide, but tended to decrease the drug concentration in plasma of control rats, while it reduced significantly the hypoglycaemic action and plasma concentration of tolbutamide in the protein-restricted rats.
Conclusions
The effects of Ginkgo biloba extract on the pharmacokinetics and pharmacodynamics of tolbutamide were significantly enhanced in rats on the low-protein diet.
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Affiliation(s)
- Yuko Taki
- Department of Pharmacokinetics and Pharmacodynamics and Global Center of Excellence (COE) Program, School of Pharmaceutical Sciences, University of Shizuoka, Shizuoka, Tokyo, Japan
| | - Eri Hagiwara
- Department of Pharmacokinetics and Pharmacodynamics and Global Center of Excellence (COE) Program, School of Pharmaceutical Sciences, University of Shizuoka, Shizuoka, Tokyo, Japan
| | - Chiemi Hirose
- Department of Pharmacokinetics and Pharmacodynamics and Global Center of Excellence (COE) Program, School of Pharmaceutical Sciences, University of Shizuoka, Shizuoka, Tokyo, Japan
| | - Kazumasa Shinozuka
- Department of Pharmacology, School of Pharmacy and Pharmaceutical Sciences, Mukogawa Women's University, Nishinomiya, Tokyo, Japan
| | - Keizo Umegaki
- National Institute of Health and Nutrition, Tokyo, Japan
| | - Shizuo Yamada
- Department of Pharmacokinetics and Pharmacodynamics and Global Center of Excellence (COE) Program, School of Pharmaceutical Sciences, University of Shizuoka, Shizuoka, Tokyo, Japan
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Lau AJ, Yang G, Rajaraman G, Baucom CC, Chang TKH. Human pregnane X receptor agonism by Ginkgo biloba extract: assessment of the role of individual ginkgolides. J Pharmacol Exp Ther 2010; 335:771-80. [PMID: 20739453 DOI: 10.1124/jpet.110.172338] [Citation(s) in RCA: 37] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
Abstract
Ginkgo biloba extract activates pregnane X receptor (PXR), but how this occurs is not known. Therefore, we investigated the mechanism of PXR activation by the extract and the role of five individual terpene trilactones in the activation. In a cell-based reporter gene assay, G. biloba extract activated human PXR (hPXR), and at a concentration present in the extract, ginkgolide A, but not ginkgolide B, ginkgolide C, ginkgolide J, or bilobalide was partially responsible for the increase in hPXR activity of the extract. Likewise, in cultured human hepatocytes, only ginkgolide A contributed to the increase in hPXR target gene expression (CYP3A4 mRNA and CYP3A-mediated testosterone 6β-hydroxylation). The extract, but none of the terpene trilactones, bound to hPXR ligand-binding domain, as analyzed by a time-resolved fluorescence resonance energy transfer competitive binding assay. Only the extract and ginkgolide A recruited steroid receptor coactivator-1, as determined by a mammalian two-hybrid assay. Compared with hPXR, rat PXR (rPXR) was activated to a lesser extent by G. biloba extract. Similar to hPXR, only ginkgolide A contributed to rPXR activation by the extract. In contrast to the effect of G. biloba extract on PXR function, it did not affect hPXR expression. Overall, the main conclusions are that G. biloba extract is an hPXR agonist, and among the five terpene trilactones investigated, only ginkgolide A contributes to the actions of the extract. Our findings provide insights into the biological and chemical mechanisms of hPXR activation by G. biloba extract.
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Affiliation(s)
- Aik Jiang Lau
- Faculty of Pharmaceutical Sciences, University of British Columbia, Vancouver, British Columbia, Canada
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Remirez D, Avila Pérez J, Jiménez López G, Jacobo OL, O'Brien PJ. Interactions between herbal remedies and medicinal drugs--considerations about Cuba. ACTA ACUST UNITED AC 2010; 24:183-94. [PMID: 20408499 DOI: 10.1515/dmdi.2009.24.2-4.183] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
The use of herbal products to treat a wide range of conditions is rapidly leading to increased intake of phytochemicals. This is one of the main reasons for reinforcing the surveillance of the safety, efficacy and quality control of traditional and complementary medicines. Herbal preparations can interact with a drug at pharmacokinetic, pharmacodynamic and pharmacogenetic levels. In this article interactions between herbal products and conventional medicines are reviewed. Reports about side effects of traditional medicines and main interactions between herbal medicines and conventional drugs in Cuba are also included. Herbal products are currently not subject to the rigorous testing indispensable for conventional drugs. However, if potential drug interactions are to be predicted, it is essential that the ability of herbal products to interfere with drug-metabolizing enzyme systems is fully established.
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Affiliation(s)
- Diadelis Remirez
- National Center for State Quality Control of Drugs (CECMED), Havana, Cuba.
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Bing Y, Zhaobao W. Effects of Ginkgo biloba extract on free radical metabolism of liver in mice during endurance exercise. AFRICAN JOURNAL OF TRADITIONAL, COMPLEMENTARY, AND ALTERNATIVE MEDICINES 2010; 7:291-5. [PMID: 21731159 DOI: 10.4314/ajtcam.v7i4.56691] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
This study investigated the effect of Ginkgo biloba extract on Free Radical Metabolism of Liver in mice during endurance exercise. Forty-eight mice were divided into the quiet group and the exercised group. And the two groups were both grouped again, including the control group and the drug-treated group. After exhaustive exercise, the exercised groups were subdivided into the immediate group and the recovery group. The swimming time to exhaustion significantly prolonged in the exercised drug-treated group as compared with the exercised control group (P < 0.05); The SOD activity of drug-treated groups significantly increased (P < 0.05) as compared with the control groups and MDA content was significantly lower (P < 0.05). The SOD activity and MDA content of exercised control groups significantly increased (P < 0.05) as compared with the quiet control group. The SOD activity and MDA content of exercised drug-treated groups significantly increased (P < 0.05) as compared with the quiet drug-treated group. The results indicated that Ginkgo biloba extract can obviously increase the body's endurance exercise capacity in mice and delay fatigue; Ginkgo biloba extract can help to increase the activity of the antioxidant enzymes in liver tissue, reduce the lipid peroxidation injury in liver tissue caused by free radicals, improve athletic ability, and promote the recovery process after exercise in mice.
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Affiliation(s)
- Yan Bing
- Dezhou University, Dezhou, Shandong Province, 253023, People's Republic of China.
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Lei HP, Ji W, Lin J, Chen H, Tan ZR, Hu DL, Liu LJ, Zhou HH. Effects of Ginkgo biloba extract on the pharmacokinetics of bupropion in healthy volunteers. Br J Clin Pharmacol 2010; 68:201-6. [PMID: 19694739 DOI: 10.1111/j.1365-2125.2009.03442.x] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022] Open
Abstract
AIMS To assess the effects of Ginkgo biloba extract on the pharmacokinetics of bupropion in healthy volunteers. METHODS Fourteen healthy male volunteers (age range 19-25 years) received orally administered bupropion (150 mg) alone and during treatment with G. biloba 240 mg day(-1) (two 60-mg capsules taken twice daily) for 14 days. Serial blood samples were obtained over 72 h after each bupropion dose, and used to derive pharmacokinetic parameters of bupropion and its CYP2B6-catalysed metabolite, hydroxybupropion. RESULTS Ginkgo biloba extract administration resulted in no significant effects on the AUC(0-infinity) of bupropion and hydroxybupropion. Bupropion mean AUC(0-infinity) value was 1.4 microg.h ml(-1)[95% confidence interval (CI) 1.2, 1.6] prior to G. biloba treatment and 1.2 microg.h ml(-1) (95% CI 1.1, 1.4) after 14 days of treatment. Hydroxybupropion mean AUC(0-infinity) value was 8.2 microg.h ml(-1) (95% CI 6.5, 10.4) before G. biloba administration and 8.7 microg.h ml(-1) (95% CI 7.1, 10.6) after treatment. The C(max) of hydroxybupropion increased from 221.8 ng ml(-1) (95% CI 176.6, 278.6) to 272.7 ng ml(-1) (95% CI 215.0, 345.8) (P = 0.038) and the t(1/2) of hydroxybupropion fell from 25.0 h (95% CI 22.7, 27.5) to 21.9 h (95% CI 19.9, 24.1) (P = 0.000). CONCLUSIONS Ginkgo biloba extract administration for 14 days does not significantly alter the basic pharmacokinetic parameters of bupropion in healthy volunteers. Although G. biloba extract treatment appears to reduce significantly the t(1/2) and increase the C(max) of hydroxybupropion, no bupropion dose adjustments appear warranted when the drug is administered orally with G. biloba extract, due to the lack of significant change observed in AUC for either bupropion or hydroxybupropion.
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Affiliation(s)
- He-Ping Lei
- Institute of Clinical Pharmacology, Hunan Key Laboratory of Pharmacogenetics, Central South University, Changsha, Hunan 410078, China
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Kubota Y, Kobayashi K, Tanaka N, Nakamura K, Kunitomo M, Umegaki K, Shinozuka K. Pretreatment with Ginkgo biloba extract weakens the hypnosis action of phenobarbital and its plasma concentration in rats. J Pharm Pharmacol 2010; 56:401-5. [PMID: 15025867 DOI: 10.1211/0022357022836] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/31/2022]
Abstract
Abstract
In a previous study, we found that orally administered Ginkgo biloba extract (GBE) induced hepatic cytochrome P450 (CYP) in rats, especially the CYP2B type. This fact suggested that GBE influenced the availability and safety of drugs that were metabolized via CYP2B type enzymes. To confirm this possibility, in this study we examined the effect of feeding a 0.1, 0.5 and 1.0% GBE diet for 2 weeks on the pharmacokinetics and pharmacological action of phenobarbital, which is known to be metabolized by CYP2B in Wistar rats. The feeding of GBE markedly shortened the sleeping time in rats. Furthermore, the maximal phenobarbital plasma concentration (Cmax) and the 24-h area under the curve (AUC0–24) were decreased in rats fed GBE. These findings indicate that GBE reduces the therapeutic potency of phenobarbital via enhancement of cytochrome P450 expression, and raises the possibility that GBE and drug interactions may occur clinically.
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Affiliation(s)
- Yoko Kubota
- Department of Pharmacology, School of Pharmaceutical Sciences, Mukogawa Women's University, Nishinomiya 663-8179, Japan
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Chatterjee SS, Doelman CJA, Nöldner M, Biber A, Koch E. Influence of the Ginkgo extract EGb 761 on rat liver cytochrome P450 and steroid metabolism and excretion in rats and man. J Pharm Pharmacol 2010; 57:641-50. [PMID: 15901353 DOI: 10.1211/0022357056046] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/31/2022]
Abstract
Abstract
Extracts from leaves of Ginkgo biloba L. are among the most used herbal medicinal products worldwide. Based on in-vitro tests and studies in rats, concern has been expressed that intake of Ginkgo extracts may affect hepatic metabolism of xenobiotics and cause drug interactions, although no evidence for modulation of cytochrome P450 (CYP450) enzyme activity was obtained in human trials. Because of these contradictory findings, we investigated the effects of the standardised extract EGb 761 on hepatic CYP450 in rats. EGb 761 (100 mg kg−1 daily, p.o., for 4 days) strongly increased liver CYP450 content and altered the ex-vivo biotransformation of androstendione, as well as metabolism of endogenous steroids. However, in human subjects no effect on the urinary steroid profile was observed after intake of EGb 761 for 28 days (240 mg daily). These results indicate that the effects of EGb 761 on drug metabolising enzymes are specific for rats and may not be extrapolated to man.
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Affiliation(s)
- Shyam S Chatterjee
- Dr Willmar Schwabe Pharmaceuticals, Willmar-Schwabe-Str. 4, 76227 Karlsruhe, Germany
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Taki Y, Yamazaki Y, Shimura F, Yamada S, Umegaki K. Time-Dependent Induction of Hepatic Cytochrome P450 Enzyme Activity and mRNA Expression by Bilobalide in Rats. J Pharmacol Sci 2009; 109:459-62. [DOI: 10.1254/jphs.08198sc] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022] Open
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Li L, Stanton JD, Tolson AH, Luo Y, Wang H. Bioactive terpenoids and flavonoids from Ginkgo biloba extract induce the expression of hepatic drug-metabolizing enzymes through pregnane X receptor, constitutive androstane receptor, and aryl hydrocarbon receptor-mediated pathways. Pharm Res 2008; 26:872-82. [PMID: 19034627 DOI: 10.1007/s11095-008-9788-8] [Citation(s) in RCA: 113] [Impact Index Per Article: 7.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/16/2008] [Accepted: 11/05/2008] [Indexed: 12/26/2022]
Abstract
PURPOSE The objective of the current study is to investigate the hypothesis that bioactive terpenoids and flavonoids of Ginkgo biloba extract (GBE) induce human hepatic drug metabolizing enzymes (DMEs) and transporters through the selective activation of pregnane X receptor (PXR), constitutive androstane receptor (CAR), and aryl hydrocarbon receptor (AhR). METHODS Human primary hepatocyte (HPH), and HepG2 cells are used as in vitro models for enzyme induction and nuclear receptor activation studies. A combination of real-time RT-PCR, transient transfection, and cell-based reporter assays were employed. RESULTS In human primary hepatocytes, real-time PCR analysis showed induction of CYP2B6, CYP3A4, UGT1A1, MDR1, and MRP2 by EGb 761, ginkgolide A (GA) and ginkgolide B (GB), but not by bilobalide (BB) or the flavonoids (quercetin, kaempferol and tamarixetin) of GBE. Cell-based reporter assays in HepG2 revealed that GA and GB are potent activators of PXR; quercetin and kaempferol activate PXR, CAR, and AhR, whereas BB exerts no effects on these xenobiotic receptors. Notably, the flavonoids induced the expression of UGT1A1 and CYP1A2 in HepG2 cells but not in HPH. CONCLUSION Our results indicate that terpenoids and flavonoids of GBE exhibit differential induction of DMEs through the selective activation of PXR, CAR, and AhR.
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Affiliation(s)
- Linhao Li
- Department of Pharmaceutical Sciences, School of Pharmacy, University of Maryland at Baltimore, 20 Penn Street, Baltimore, Maryland, 21201, USA
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Fakeye TO, Tijani A, Adebisi O. A survey of the use of herbs among patients attending secondary-level health care facilities in southwestern Nigeria. ACTA ACUST UNITED AC 2008; 7:213-27. [PMID: 18928143 DOI: 10.1080/15228940802152901] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
Abstract
This study was carried out to evaluate the herb usage among patients attending secondary health facilities in Southwestern Nigeria. Data including allergies to drug and herbs, use of social drugs, and herbs and their perceived efficacy to herbs was collected from 265 patients (inpatients n = 65; outpatients n = 200) using structured questionnaire and patients' drug charts. A total of 15.4% of inpatients were found to be using herbs that may be potentially harmful due to drug-drug/drug-herb interactions. Nine percent experienced adverse effects with the use of herbs, whereas 2% experienced adverse reactions on coadministration with prescribed drugs. A high percent of outpatients, 38%, were using alcoholic beverages for extracting the plant materials themselves. The study showed that the use of herbs with drugs is widely practiced among patients attending secondary health care facilities in Nigeria, usually without the doctor or pharmacist's knowledge.
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Affiliation(s)
- Titilayo Oyelola Fakeye
- Department of Clinical Pharmacy and Pharmacy Administration, University of Ibadan, Ibadan, Nigeria.
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Deng Y, Bi HC, Zhao LZ, He F, Liu YQ, Yu JJ, Ou ZM, Ding L, Chen X, Huang ZY, Huang M, Zhou SF. Induction of cytochrome P450s by terpene trilactones and flavonoids of theGinkgo bilobaextract EGb 761 in rats. Xenobiotica 2008; 38:465-81. [DOI: 10.1080/00498250701883233] [Citation(s) in RCA: 35] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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Yeung EYH, Sueyoshi T, Negishi M, Chang TKH. Identification of Ginkgo biloba as a novel activator of pregnane X receptor. Drug Metab Dispos 2008; 36:2270-6. [PMID: 18725505 DOI: 10.1124/dmd.108.023499] [Citation(s) in RCA: 48] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/31/2023] Open
Abstract
Pregnane X receptor (PXR; NR1I2) is a ligand-activated transcription factor that plays a role not only in drug metabolism and transport but also in various other biological processes. Ginkgo biloba is a herbal medicine commonly used to manage memory impairment. Treatment of primary cultures of rat hepatocytes with G. biloba extract increases the mRNA expression of CYP3A23, which is a target gene for rat PXR. The present study was conducted to test the hypothesis that G. biloba extract activates PXR. Treatment of mouse PXR (mPXR) or human PXR (hPXR)-transfected HepG2 cells with G. biloba extract at 200 microg/ml increased mPXR and hPXR activation by 3.2- and 9.5-fold, respectively. Dose-response analysis showed a log-linear increase in hPXR activation by the extract over the range of 200 to 800 microg/ml. To determine whether G. biloba extract induces hPXR target gene expression, cultured LS180 human colon adenocarcinoma cells were treated for 72 h with the extract. G. biloba extract at 200, 400, and 800 microg/ml increased CYP3A4 mRNA expression by 1.7-, 2.4-, and 2.5-fold, respectively. The same concentrations of the extract increased CYP3A5 (1.3-3.6-fold) and P-glycoprotein (ABCB) 1 (2.7-6.4-fold) mRNA expression. At concentrations (5 and 10 microM) that did not down-regulate PXR gene expression and were not cytotoxic, L-sulforaphane (an hPXR antagonist) decreased CYP3A4, CYP3A5, and ABCB1 gene expression in cells treated with G. biloba extract. In summary, G. biloba extract activated mPXR and hPXR in a cell-based reporter gene assay and induced CYP3A4, CYP3A5, and ABCB1 gene expression in hPXR-expressing LS180 cells.
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Affiliation(s)
- Eugene Y H Yeung
- Faculty of Pharmaceutical Sciences, University of British Columbia, 2146 East Mall, Vancouver, BC, Canada V6T 1Z3
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Robertson SM, Davey RT, Voell J, Formentini E, Alfaro RM, Penzak SR. Effect of Ginkgo biloba extract on lopinavir, midazolam and fexofenadine pharmacokinetics in healthy subjects. Curr Med Res Opin 2008; 24:591-9. [PMID: 18205997 DOI: 10.1185/030079908x260871] [Citation(s) in RCA: 65] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Abstract
OBJECTIVE Animal and in vitro data suggest that Ginkgo biloba extract (GBE) may modulate CYP3A4 activity. As such, GBE may alter the exposure of HIV protease inhibitors metabolized by CYP3A4. It is also possible that GBE could alter protease inhibitor pharmacokinetics (PK) secondary to modulation of P-glycoprotein (P-gp). The primary objective of the study was to evaluate the effect of GBE on the exposure of lopinavir in healthy volunteers administered lopinavir/ritonavir. Secondary objectives were to compare ritonavir exposure pre- and post-GBE, and assess the effect of GBE on single doses of probe drugs midazolam and fexofenadine. METHODS This open-label study evaluated the effect of 2 weeks of standardized GBE administration on the steady-state exposure of lopinavir and ritonavir in 14 healthy volunteers administered lopinavir/ritonavir to steady-state. In addition, single oral doses of probe drugs midazolam and fexofenadine were administered prior to and after 4 weeks of GBE (following washout of lopinavir/ritonavir) to assess the influence of GBE on CYP3A and P-gp activity, respectively. RESULTS Lopinavir, ritonavir and fexofenadine exposures were not significantly affected by GBE administration. However, GBE decreased midazolam AUC(0-infinity) and C(max) by 34% (p = 0.03) and 31% (p = 0.03), respectively, relative to baseline. In general, lopinavir/ritonavir and GBE were well tolerated. Abnormal laboratory results included mild elevations in hepatic enzymes, cholesterol and triglycerides, and mild-to-moderate increases in total bilirubin. CONCLUSIONS Our results suggest that GBE induces CYP3A metabolism, as assessed by a decrease in midazolam concentrations. However, there was no change in the exposure of lopinavir, likely due to ritonavir's potent inhibition of CYP3A4. Thus, GBE appears unlikely to reduce the exposure of ritonavir-boosted protease inhibitors, while concentrations of unboosted protease inhibitors may be affected. Limitations to our study include the single sequence design and the evaluation of a ritonavir-boosted protease inhibitor exclusively.
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Affiliation(s)
- Sarah M Robertson
- Office of Clinical Pharmacology, Center for Drug Evaluation and Research, US Food and Drug Administration, New Hampshire Ave., Silver Spring, MD 20901, USA.
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Tada Y, Kagota S, Kubota Y, Nejime N, Nakamura K, Kunitomo M, Shinozuka K. Long-Term Feeding of Ginkgo biloba Extract Impairs Peripheral Circulation and Hepatic Function in Aged Spontaneously Hypertensive Rats. Biol Pharm Bull 2008; 31:68-72. [DOI: 10.1248/bpb.31.68] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Affiliation(s)
- Yukari Tada
- Department of Pharmacology, School of Pharmacy and Pharmaceutical Sciences, Mukogawa Women's University
| | - Satomi Kagota
- Department of Pharmacology, School of Pharmacy and Pharmaceutical Sciences, Mukogawa Women's University
| | - Yoko Kubota
- Department of Biopharmaceutics, Nihon Pharmaceutical University
| | - Namie Nejime
- Department of Pharmacology, School of Pharmacy and Pharmaceutical Sciences, Mukogawa Women's University
| | - Kazuki Nakamura
- Department of Pharmacology, School of Pharmacy and Pharmaceutical Sciences, Mukogawa Women's University
| | - Masaru Kunitomo
- Department of Pharmacology, School of Pharmacy and Pharmaceutical Sciences, Mukogawa Women's University
| | - Kazumasa Shinozuka
- Department of Pharmacology, School of Pharmacy and Pharmaceutical Sciences, Mukogawa Women's University
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Boveris AD, Galleano M, Puntarulo S. In vivo supplementation with Ginkgo biloba protects membranes against lipid peroxidation. Phytother Res 2007; 21:735-40. [PMID: 17450504 DOI: 10.1002/ptr.2153] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/30/2023]
Abstract
The effect of Ginkgo biloba (Gb) supplementation in vivo was studied on lipid peroxidation of microsomal membranes. Administration of up to 100 mg/kg/day Gb to rats did not significantly affect either the activity of microsomal enzymes, the rate of generation of superoxide anion or the iron reduction rate by rat liver microsomes. Lipid peroxidation, assessed by the generation of lipid radicals measured by electron paramagnetic resonance (EPR) spectroscopy using POBN as the spin trap, was reduced by 39.7% and thiobarbituric acid reactive substances (TBARS) generation by 30% after Gb supplementation (100 mg/kg/day) for 10 days. Moreover, membranes from Gb treated animals showed a significant lower content of lipid radicals and TBARS after exposure to oxidative stress both in vitro (t-butyl hydroperoxide) and in vivo (acute iron overload). The data presented here showed that Gb extracts were able to limit lipid peroxidation and scavenge lipid radicals in vivo and actively protect membranes from oxidative damage.
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Affiliation(s)
- Alejandro D Boveris
- Physical Chemistry-PRALIB, School of Pharmacy and Biochemistry, University of Buenos Aires, Argentina
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Umegaki K, Taki Y, Endoh K, Taku K, Tanabe H, Shinozuka K, Sugiyama T. Bilobalide in Ginkgo biloba extract is a major substance inducing hepatic CYPs. J Pharm Pharmacol 2007; 59:871-7. [PMID: 17637180 DOI: 10.1211/jpp.59.6.0014] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/31/2022]
Abstract
In a search for substances related to the marked induction of hepatic cytochrome P450 (CYP) by ginkgo biloba extract (GBE), mice were given either GBE (1000 mg kg(-1)) or fractions of GBE for 5 days. The content and activity of CYPs were induced markedly by a bilobalide-rich fraction, but not by flavonoid-rich fractions. The level of induction by the bilobalide-rich fraction was almost the same as that induced by the unfractionated GBE, suggesting that bilobalide is largely responsible for the CYPs induction. To confirm these findings, mice were given various doses of bilobalide (10.5, 21 and 42 mg kg(-1)), or GBE (1000 mg kg(-1), containing bilobalide at 42 mg kg(-1)). Treatment with bilobalide induced CYPs markedly and in a dose-dependent manner, and the level of induction was quite similar between bilobalide (42 mg kg(-1)) and GBE. Treatment with GBE and with bilobalide greatly induced pentoxyresorufin O-dealkylase activity. These findings indicate that bilobalide is the major substance in GBE that induces hepatic CYPs.
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Affiliation(s)
- Keizo Umegaki
- National Institute of Health and Nutrition, 1-23-1 Toyama, Shinjuku-ku, Tokyo 162-8636, Japan.
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Nutescu EA, Shapiro NL, Ibrahim S, West P. Warfarin and its interactions with foods, herbs and other dietary supplements. Expert Opin Drug Saf 2007; 5:433-51. [PMID: 16610971 DOI: 10.1517/14740338.5.3.433] [Citation(s) in RCA: 91] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Abstract
Despite its complex pharmacokinetic and pharmacodynamic profile, warfarin is still one of the most widely used oral anticoagulant agents. Attaining optimal anticoagulation with this agent is clinically challenging in view of its many food and drug interactions. Inappropriate anticoagulation control can expose patients to an increased risk of bleeding or thromboembolic complications, due to over and underanticoagulation, respectively. Fluctuations in dietary vitamin K intake can have a significant effect on the degree of anticoagulation in patients treated with warfarin. In addition, the explosion in use of various dietary supplements and herbal products can lead to undesired outcomes on anticoagulant levels. The aim of this review is to discuss the scope and the potential clinical impact of the most commonly reported food, dietary supplement and herbal interactions with warfarin therapy. Practical steps for patients and providers to minimise these interactions are highlighted.
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Affiliation(s)
- Edith A Nutescu
- Department of Pharmacy Practice, University of Illinois, College of Pharmacy, Chicago, IL 60612, USA.
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He N, Cai HB, Xie HG, Collins X, Edeki TI, Strom SC. INDUCTION OF CYP3A IN PRIMARY CULTURES OF HUMAN HEPATOCYTES BY GINKGOLIDES A AND B. Clin Exp Pharmacol Physiol 2007; 34:632-5. [PMID: 17581220 DOI: 10.1111/j.1440-1681.2007.04630.x] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
1. The present study was designed to determine the effects of ginkgolide A, ginkgolide B and quercetin on CYP3A protein expression and enzyme activity in primary cultures of human hepatocytes. 2. Hepatocytes were pretreated with ginkgolide A, ginkgolide B and quercetin (at 1, 3, 10 and 30 micromol/L) for 48 h and then exposed to testosterone (250 micromol/L) for 30 min. Rifampin (10 micromol/L) and phenobarbital (2 mmol/L) were used as positive controls. The CYP3A activity was measured by the amount of 6beta-hydroxytestosterone in the culture medium and CYP3A protein in hepatocyte lysate was semiquantified by immunoblotting. 3. Compared with the vehicle control, ginkgolides A and B, at 30 micromol/L, significantly induced CYP3A protein expression (2.1- and 2-fold, respectively; both P < 0.01) and markedly induced CYP3A-mediated testosterone 6beta-hydroxylation (2.5-fold each; P < 0.05 for ginkgolide A; P > 0.05 for ginkgolide B). Quercetin had no apparent induction. 4. Ginkgolide A and ginkgolide B can induce CYP3A protein expression and enzyme activity in primary cultures of human hepatocytes at higher doses.
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Affiliation(s)
- Nu He
- Department of Pharmacology and Toxicology, Morehouse School of Medicine, Atlanta, GA 30310, USA.
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Tang J, Sun J, Zhang Y, Li L, Cui F, He Z. Herb-drug interactions: Effect of Ginkgo biloba extract on the pharmacokinetics of theophylline in rats. Food Chem Toxicol 2007; 45:2441-5. [PMID: 17681658 DOI: 10.1016/j.fct.2007.05.023] [Citation(s) in RCA: 32] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/30/2005] [Revised: 03/09/2006] [Accepted: 05/29/2007] [Indexed: 11/17/2022]
Abstract
Herbal medicines have received great attention as alternative medicines in recent years and are also referred to as a dietary supplement or health food. Ginkgo biloba extract (GBE) is one of the most popular herbal medicines. However, little is known about the metabolic interactions between GBE and clinically used drugs. This study attempted to investigate the effect of GBE on the pharmacokinetics of theophylline, a cytochrome P450 (CYP) 1A2 substrate and an important therapeutic agent with narrow therapeutic window used for the treatment of asthma. Commercial GBE (10 or 100 mg/kg, p.o.) or water (control group) was given to rats (6 rats for each group) for 5 consecutive days and on the sixth day theophylline (10 mg/kg) was administered either orally or intravenously. The results showed that pretreatment of rats with GBE resulted in an increase in the total clearance of theophylline of about 30% (GBE 10 mg/kg, P<0.05) and 70% (GBE 100 mg/kg, P<0.01) compared with the control group after intravenous administration of theophylline (10 mg/kg). After oral administration of theophylline (10 mg/kg), the AUC(0-24h) of theophylline was reduced by 40% following pretreatment with GBE (100 mg/kg, P<0.01). These results demonstrate that GBE pretreatment increased CYP1A2 metabolic activity and the clearance of theophylline in rats.
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Affiliation(s)
- Jingling Tang
- Department of Biopharmaceutics, School of Pharmacy, Shenyang Pharmaceutical University, Mailbox 59#, 103 Wenhua Road, Shenyang 110016, China
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Chen WD, Liang Y, Xie L, Lu T, Liu XD, Wang GJ. Pharmacokinetics of the ginkgo B following intravenous administration of ginkgo B emulsion in rats. Biol Pharm Bull 2007; 30:1-5. [PMID: 17202649 DOI: 10.1248/bpb.30.1] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Ginkgo B (GB) is an extract from the leaves of Ginkgo biloba, used in the treatment of dementia, cerebral insufficiency or related cognitive decline. In this paper, the main features of the pharmacokinetics of GB emulsion in rats were reviewed and the binding rate of GB to rat plasma and human plasma protein were investigated meanwhile. The concentrations of GB in plasma, tissue, and excretion of rats after i.v. administration of GB were measured using HPLC-ESI-MS. The metabolite was qualitated by LC-MS/MS. Intravenously administered GB was eliminated in a biphasic manner with a prominent initial phase (half-life of 0.3 h) followed by a slower terminal phase (half-life of 1.5 h). After i.v. 4, 12 and 36 mg/kg GB emulsion, the pharmacokinetic parameters from a two compartment model analysis of plasma samples were AUC(0-tau) (microg x min/ml): 53.7, 165.5 and 649.7; CL (l/min/kg): 0.07, 0.07 and 0.05; V(C) (l/kg): 2.27, 3.27 and 2.76, respectively. Peak concentrations generally occurred at 10 min except brain and fat. Tissue concentration then declined by several-fold during 6 h although still present in most tissues at 6 h. Single intravenous dose was mainly excreted in the urine (40-50%), feces contained less than 30%. The binding rate to rat plasma was little higher than to human plasma, but the difference was negligible. Some metabolites were found in urine and bile through qualitative analysis on the urine and bile by LC-MS/MS.
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Affiliation(s)
- Wei-Dong Chen
- Key Lab of Drug Metabolism & Pharmacokinetics, China Pharmaceutical University, Nanjing City, China
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van den Bout-van den Beukel CJP, Koopmans PP, van der Ven AJAM, De Smet PAGM, Burger DM. Possible drug-metabolism interactions of medicinal herbs with antiretroviral agents. Drug Metab Rev 2006; 38:477-514. [PMID: 16877262 DOI: 10.1080/03602530600754065] [Citation(s) in RCA: 50] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
Abstract
Herbal medicines are widely used by HIV patients. Several herbal medicines have been shown to interact with antiretroviral drugs, which might lead to drug failure. We have aimed to provide an overview of the modulating effects of Western and African herbal medicines on antiretroviral drug-metabolizing and transporting enzymes, focusing on potential herb-antiretroviral drug interactions. Echinacea, garlic, ginkgo, milk thistle, and St. John's wort have the potential to cause significant interactions. In vitro and in vivo animal studies also indicated other herbs with a potential for interactions; however, most evidence is based on in vitro studies. Further pharmacokinetic studies to unveil potential Western and especially African herb-antiretroviral drug interactions are urgently required, and the clinical significance of these interactions should be assessed.
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Rajaraman G, Chen J, Chang TKH. Ginkgolide A contributes to the potentiation of acetaminophen toxicity by Ginkgo biloba extract in primary cultures of rat hepatocytes. Toxicol Appl Pharmacol 2006; 217:225-33. [PMID: 17045319 DOI: 10.1016/j.taap.2006.09.005] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/23/2006] [Revised: 09/01/2006] [Accepted: 09/05/2006] [Indexed: 11/18/2022]
Abstract
The present cell culture study investigated the effect of Ginkgo biloba extract pretreatment on acetaminophen toxicity and assessed the role of ginkgolide A and cytochrome P450 3A (CYP3A) in hepatocytes isolated from adult male Long-Evans rats provided ad libitum with a standard diet. Acetaminophen (7.5-25 mM for 24 h) conferred hepatocyte toxicity, as determined by the lactate dehydrogenase (LDH) assay. G. biloba extract alone increased LDH leakage in hepatocytes at concentrations > or =75 mug/ml and > or =750 mug/ml after a 72 h and 24 h treatment period, respectively. G. biloba extract (25 or 50 mug/ml once every 24 h for 72 h) potentiated LDH leakage by acetaminophen (10 mM for 24 h; added at 48 h after initiation of extract pretreatment). The effect was confirmed by a decrease in [(14)C]-leucine incorporation. At the level present in a modulating concentration (50 mug/ml) of the extract, ginkgolide A (0.55 mug/ml), which increased CYP3A23 mRNA levels and CYP3A-mediated enzyme activity, accounted for part but not all of the potentiating effect of the extract on acetaminophen toxicity. This occurred as a result of CYP3A induction by ginkgolide A because triacetyloleandomycin (TAO), a specific inhibitor of CYP3A catalytic activity, completely blocked the effect of ginkgolide A. Ginkgolide B, ginkgolide C, ginkgolide J, quercetin, kaempferol, isorhamnetin, and isorhamnetin-3-O-rutinoside did not alter the extent of LDH leakage by acetaminophen. In summary, G. biloba pretreatment potentiated acetaminophen toxicity in cultured rat hepatocytes and ginkgolide A contributed to this novel effect of the extract by inducing CYP3A.
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Affiliation(s)
- Ganesh Rajaraman
- Faculty of Pharmaceutical Sciences, The University of British Columbia, 2146 East Mall, Vancouver, British Columbia, Canada V6T 1Z3
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de Lima KCM, Schilichting CLR, Junior LAC, da Silva FM, Benetoli A, Milani H. TheGinkgo biloba extract, EGb 761, fails to reduce brain infarct size in rats after transient, middle cerebral artery occlusion in conditions of unprevented, ischemia-induced fever. Phytother Res 2006; 20:438-43. [PMID: 16619358 DOI: 10.1002/ptr.1872] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
There is much biochemical evidence, but very few studies in animal models of stroke in vivo, to suggest that Ginkgo biloba (EGb 761) may offer neuroprotection against regional, ischemic brain damage; additional investigations are needed to ensure future clinical trials. This study reports the effects of EGb 761 given acutely or chronically before ischemia. Rats were subjected to middle cerebral artery occlusion (MCAO) for 2 h and the brain infarct size was assessed 24 h later. Dipyrone (100 mg/kg, i.p.) was injected 30 min before ischemia, and 2.5 and 5.5 h after ischemia, to reduce ischemia-induced fever. EGb 761 (Tebonin) was given acutely (200 mg/kg, p.o., 60 min before ischemia) or chronically (100 mg/kg, p.o., once daily, for 14 days before ischemia). Acute or chronic treatment with EGb 761, either alone or in combination with dipyrone, did not reduce the infarct size compared with saline alone (p > 0.05). Dipyrone failed to prevent ischemia-induced fever during the intra-ischemic period (p > 0.05 vs saline; p < 0.001 vs sham). In the reperfusion phase, dipyrone reduced fever to normothermic levels in the group treated acutely with EGb 761 (p < 0.01 vs saline, p > 0.05 vs sham) but not after chronic EGb 761 (p < 0.01 vs sham), indicating possible pharmacokinetic interaction. In conclusion, within the context of unprevented, ischemia-induced fever, the present results demonstrate that EGb 761 has no significant effect on brain infarct size.
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Affiliation(s)
- Keli Carina Miltus de Lima
- Department of Pharmacy and Pharmacology, Health Science Center, Pharmaceutical Sciences Post-Graduation Program, State University of Maringá, Av. Colombo, 5790, CEP 87020-900 Maringá, Paraná, Brazil
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