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Wirwis A, Sadowski Z. Green Synthesis of Silver Nanoparticles: Optimizing Green Tea Leaf Extraction for Enhanced Physicochemical Properties. ACS OMEGA 2023; 8:30532-30549. [PMID: 37636976 PMCID: PMC10448680 DOI: 10.1021/acsomega.3c03775] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 05/29/2023] [Accepted: 08/01/2023] [Indexed: 08/29/2023]
Abstract
In this paper, we present the optimization of green tea leaf (Camellia sinensis L.) extraction, carried out using water and hydroalcoholic solvents, for the subsequent synthesis of silver nanoparticles (AgNPs). The value ranges for independent variables, including pH, time, and temperature, were selected based on single-factor experiments and used for extraction in the order presented by the Box-Behnken design. Three-dimensional response surface graphs were used to visually present the optimization results and determine the optimal extraction conditions: pH = 7, 30 min, 80 °C for water and pH = 5.5, 50 min, and 80 °C for water-ethanol. Our findings indicate that the water-ethanol mixture extracted more polyphenols. We compared the physicochemical properties of AgNPs obtained using both types of extractants via DLS and TEM analysis. We proposed a predicted mechanism for the reduction and stabilization of AgNPs based on the Fourier transform infrared data. The hydroethanolic extract leads to significant nanoparticle aggregation, which can be explained by the nucleation theory and agglomeration of nanoparticles in the presence of excess macromolecular organic substances (flocculation).
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Affiliation(s)
- Anna Wirwis
- Department of Process Engineering and
Technology of Polymer and Carbon Materials, Wroclaw University of Science and Technology, Wybrzeze Wyspianskiego 27, 50-370 Wrocław, Poland
| | - Zygmunt Sadowski
- Department of Process Engineering and
Technology of Polymer and Carbon Materials, Wroclaw University of Science and Technology, Wybrzeze Wyspianskiego 27, 50-370 Wrocław, Poland
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dos Santos JRMP, Junior JGM, Albert ALM, Leandro KC. Rapid Screening Method in the Identification of 17 Adulterants in Dietary Supplements. Chromatographia 2021. [DOI: 10.1007/s10337-021-04007-0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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Sassone J, Muster M, Barrack MT. Prevalence and Predictors of Higher-Risk Supplement Use Among Collegiate Athletes. J Strength Cond Res 2019; 33:443-450. [PMID: 30531412 DOI: 10.1519/jsc.0000000000002979] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2023]
Abstract
Sassone, J, Muster, M, and Barrack, MT. Prevalence and predictors of higher-risk supplement use among National Collegiate Athletic Association Division I athletes. J Strength Cond Res 33(2): 443-450, 2019-This study aimed to identify the prevalence and predictors associated with the use of higher-risk dietary supplements, defined as supplements containing herbal ingredients, caffeine, or those classified for weight loss, muscle-building, or as a preworkout supplement, among 557 National Collegiate Athletic Association Division I male and female collegiate athletes. Although 252 (45.2%) athletes reported the use of a dietary supplement on ≥2 days per week over the past year, 46 (8.3%) athletes met criteria for higher-risk supplement use. Twenty (3.6%) athletes reported the use of herbal, 1 (0.2%) caffeinated, 5 (0.9%) weight loss, 28 (5.0%) preworkout, and 1 (0.2%) muscle-building supplements. Body mass index status (BMI ≥30 kg·m), sport-type (sports using the phosphocreatine energy system), and college year (≥4th year) were associated with the use of preworkout, muscle-building, or herbal supplements. A multiple regression analysis identified predictors of higher-risk supplement use including the number of dietary supplements used in the past year (odds ratio [OR] = 2.1, 95% confidence interval [CI] = 1.7-2.7, p < 0.001), the reported motivation of taking dietary supplements to gain muscle and lose body fat (OR = 3.5, 95% CI = 1.1-11.7, p = 0.04), and the motivation to increase athletic endurance (OR = 3.5, 95% CI = 4.0, 95% CI = 1.6-9.9, p < 0.005). These factors may be considered as a part of a screening process to evaluate athletes with an increased risk of higher-risk supplement use and potential consequences to health or eligibility status.
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Affiliation(s)
- John Sassone
- Department of Family and Consumer Sciences, California State University, Long Beach, Long Beach, California
| | - Mark Muster
- Department of Family and Consumer Sciences, California State University, Northridge, Northridge, California
| | - Michelle T Barrack
- Department of Family and Consumer Sciences, California State University, Long Beach, Long Beach, California
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4
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Comparative study in physico-chemical properties of gelatin derivatives and their microspheres as carriers for controlled release of green tea's extract. J Drug Deliv Sci Technol 2018. [DOI: 10.1016/j.jddst.2018.08.005] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
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Ornelas J, Routt E, Kallis P, Lev‐Tov H. Use of thehCONSORTcriteria as a reporting standard for herbal interventions for common dermatoses: a systematic review. Br J Dermatol 2018; 178:889-896. [DOI: 10.1111/bjd.16256] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 12/09/2017] [Indexed: 01/14/2023]
Affiliation(s)
- J. Ornelas
- University of California Davis Department of Dermatology Sacramento CA U.S.A
| | - E. Routt
- Icahn School of Medicine at Mount Sinai Department of Dermatology New York U.S.A
| | - P. Kallis
- University of Miami Miller School of Medicine Department of Dermatology and Cutaneous Surgery Miami FL U.S.A
| | - H. Lev‐Tov
- University of Miami Miller School of Medicine Department of Dermatology and Cutaneous Surgery Miami FL U.S.A
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Rahim MA, Björnmalm M, Bertleff-Zieschang N, Ju Y, Mettu S, Leeming MG, Caruso F. Multiligand Metal-Phenolic Assembly from Green Tea Infusions. ACS APPLIED MATERIALS & INTERFACES 2018; 10:7632-7639. [PMID: 28722393 DOI: 10.1021/acsami.7b09237] [Citation(s) in RCA: 31] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
The synthesis of hybrid functional materials using the coordination-driven assembly of metal-phenolic networks (MPNs) is of interest in diverse areas of materials science. To date, MPN assembly has been explored as monoligand systems (i.e., containing a single type of phenolic ligand) where the phenolic components are primarily obtained from natural sources via extraction, isolation, and purification processes. Herein, we demonstrate the fabrication of MPNs from a readily available, crude phenolic source-green tea (GT) infusions. We employ our recently introduced rust-mediated continuous assembly strategy to prepare these GT MPN systems. The resulting hollow MPN capsules contain multiple phenolic ligands and have a shell thickness that can be controlled through the reaction time. These multiligand MPN systems have different properties compared to the analogous MPN systems reported previously. For example, the Young's modulus (as determined using colloidal-probe atomic force microscopy) of the GT MPN system presented herein is less than half that of MPN systems prepared using tannic acid and iron salt solutions, and the disassembly kinetics are faster (∼50%) than other, comparable MPN systems under identical disassembly conditions. Additionally, the use of rust-mediated assembly enables the formation of stable capsules under conditions where the conventional approach (i.e., using iron salt solutions) results in colloidally unstable dispersions. These differences highlight how the choice of phenolic ligand and its source, as well as the assembly protocol (e.g., using solution-based or solid-state iron sources), can be used to tune the properties of MPNs. The strategy presented herein expands the toolbox of MPN assembly while also providing new insights into the nature and robustness of metal-phenolic interfacial assembly when using solution-based or solid-state metal sources.
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Liu H, Liu H, Zhou Z, Parise RA, Chu E, Schmitz JC. Herbal formula Huang Qin Ge Gen Tang enhances 5-fluorouracil antitumor activity through modulation of the E2F1/TS pathway. Cell Commun Signal 2018; 16:7. [PMID: 29458395 PMCID: PMC5819251 DOI: 10.1186/s12964-018-0218-1] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/09/2017] [Accepted: 02/12/2018] [Indexed: 01/16/2023] Open
Abstract
BACKGROUND 5-Fluorouracil (5-FU) remains the most widely used agent to treat colorectal cancer (CRC). However, its clinical efficacy is currently limited by the development of drug resistance. Traditional Chinese Herbal Medicine (TCM) has been shown to enhance the efficacy of standard anticancer agents. However, there are only a limited number of well-controlled preclinical and clinical studies documenting the potential benefit of TCM. Herein, we screened a series of TCM formulas in in vitro and in vivo animal models to identify biologically active formulas that were effective against CRC. METHODS Cell proliferation and clonogenic assays, cell cycle analysis, immunoblot analysis and qRT-PCR were performed to investigate the mechanism(s) of action of the most active formula Huang-Qin-Ge-Gen-Tang (HQGGT) on growth of human CRC cells. In vivo animal models were used to document the antitumor activity of HQGGT alone and HQGGT in combination with 5-FU. RESULTS We identified HQGGT, which suppressed the in vivo growth of human colon cancer HT-29 xenografts without associated toxicities. HQGGT displayed anti-proliferative activity against a wide range of CRC cell lines. This growth suppression correlated with induction of apoptosis. HQGGT enhanced the cytotoxicity of 5-FU against human 5-FU-resistant cells (H630R1) and mouse colon cancer cells (MC38). Our studies showed that the mechanism of action of this synergism was the result of suppression of thymidylate synthase (TS) expression by HQGGT. We analyzed different batches of HQGGT and observed consistent chemical fingerprints and biological activity. Finally, we show that orally administered HQGGT significantly enhanced the antitumor effect of 5-FU in mice bearing MC38 xenografts. CONCLUSIONS These findings provide support for the potential role of HQGGT as a novel modulator of fluoropyrimidine chemotherapy in the treatment of CRC.
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Affiliation(s)
- Haizhou Liu
- Department of Medicine, Division of Hematology-Oncology, University of Pittsburgh, Pittsburgh, PA, USA.,Cancer Therapeutics Program, University of Pittsburgh Cancer Institute, University of Pittsburgh School of Medicine, 5117 Centre Ave, Pittsburgh, PA, 15213, USA
| | - Hui Liu
- Department of Medicine, Division of Hematology-Oncology, University of Pittsburgh, Pittsburgh, PA, USA.,Cancer Therapeutics Program, University of Pittsburgh Cancer Institute, University of Pittsburgh School of Medicine, 5117 Centre Ave, Pittsburgh, PA, 15213, USA.,Department of Oncology, Shuguang Hospital, Shanghai University of Traditional Chinese Medicine, Shanghai, China
| | - Zhiyi Zhou
- Department of Medicine, Division of Hematology-Oncology, University of Pittsburgh, Pittsburgh, PA, USA.,Cancer Therapeutics Program, University of Pittsburgh Cancer Institute, University of Pittsburgh School of Medicine, 5117 Centre Ave, Pittsburgh, PA, 15213, USA.,Department of Oncology, Longhua Hospital, Shanghai University of Traditional Chinese Medicine, Shanghai, China
| | - Robert A Parise
- Cancer Therapeutics Program, University of Pittsburgh Cancer Institute, University of Pittsburgh School of Medicine, 5117 Centre Ave, Pittsburgh, PA, 15213, USA
| | - Edward Chu
- Department of Medicine, Division of Hematology-Oncology, University of Pittsburgh, Pittsburgh, PA, USA.,Cancer Therapeutics Program, University of Pittsburgh Cancer Institute, University of Pittsburgh School of Medicine, 5117 Centre Ave, Pittsburgh, PA, 15213, USA
| | - John C Schmitz
- Department of Medicine, Division of Hematology-Oncology, University of Pittsburgh, Pittsburgh, PA, USA. .,Cancer Therapeutics Program, University of Pittsburgh Cancer Institute, University of Pittsburgh School of Medicine, 5117 Centre Ave, Pittsburgh, PA, 15213, USA.
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Alghadir AH, Gabr SA, Al-Eisa ES. Green tea and exercise interventions as nondrug remedies in geriatric patients with rheumatoid arthritis. J Phys Ther Sci 2016; 28:2820-2829. [PMID: 27821943 PMCID: PMC5088134 DOI: 10.1589/jpts.28.2820] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/21/2016] [Accepted: 06/16/2016] [Indexed: 12/13/2022] Open
Abstract
This study aimed to evaluate the effects of green tea and supervised exercise training
interventions on improvement of disease activity and bone metabolism markers in rheumatoid
arthritis patients. [Subjects and Methods] One-hundred and twenty subjects who had a mean
age of (60.7 ± 2.53 years) and had been diagnosed with rheumatoid arthritis at least ten
years previously were randomly included in this study. Patients were treated with
infliximab, green tea, or a supervised exercise program for six months. Disease activity
markers as well as antioxidant activity of green tea extracts were estimated before
supplementation using in vitro assays. [Results] Rheumatoid arthritis patients treated
with green tea for 6 months alone or in combination with infliximab or an exercise program
showed significant improvement in disease activity parameters, including C-reactive
protein, and erythrocyte sedimentation rate, swollen and tender joints counts, and
modified Stanford Health Assessment Questionnaire score, along with an increase in serum
levels of bone resorption markers, i.e., deoxypyridinoline, amino-terminal telopeptide of
type 1 collagen, and bone alkaline phosphatase, at 6 months of after initial treatment.
The European League Against Rheumatism and American College of Rheumatology scores
revealed more clinical improvement in the disease activity of rheumatoid arthritis
patients treated with green tea along with exercise compared with rheumatoid arthritis
patients treated with infliximab or exercise combinations. This may have been due to the
higher potential antioxidant activity of green tea (89.6% to 96.5%). [Conclusion] Both
exercise and green tea interventions appeared to be beneficial as nondrug modulates for
rheumatoid arthritis disorders.
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Affiliation(s)
- Ahmad H Alghadir
- Rehabilitation Research Chair, College of Applied Medical Sciences, King Saud University: Riyadh 11433, Saudi Arabia
| | - Sami A Gabr
- Rehabilitation Research Chair, College of Applied Medical Sciences, King Saud University: Riyadh 11433, Saudi Arabia; Department of Anatomy, Faculty of Medicine, Mansoura University, Egypt
| | - Einas S Al-Eisa
- Rehabilitation Research Chair, College of Applied Medical Sciences, King Saud University: Riyadh 11433, Saudi Arabia
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Lim YC, Rajabalaya R, Lee SHF, Tennakoon KU, Le QV, Idris A, Zulkipli IN, Keasberry N, David SR. Parasitic Mistletoes of the Genera Scurrula and Viscum: From Bench to Bedside. Molecules 2016; 21:E1048. [PMID: 27548121 PMCID: PMC6273404 DOI: 10.3390/molecules21081048] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/28/2016] [Revised: 07/31/2016] [Accepted: 08/04/2016] [Indexed: 01/16/2023] Open
Abstract
The mistletoes, stem hemiparasites of Asia and Europe, have been used as medicinal herbs for many years and possess sophisticated systems to obtain nutrients from their host plants. Although knowledge about ethnomedicinal uses of mistletoes is prevalent in Asia, systematic scientific study of these plants is still lacking, unlike its European counterparts. This review aims to evaluate the literature on Scurrula and Viscum mistletoes. Both mistletoes were found to have anticancer, antimicrobial, antioxidant and antihypertensive properties. Plants from the genus Scurrula were found to inhibit cancer growth due to presence of phytoconstituents such as quercetin and fatty acid chains. Similar to plants from the genus Viscum, Scurrula also possesses TNFα activity to strengthen the immune system to combat cancer. In line with its anticancer activity, both mistletoes are rich in antioxidants that confer protection against cancer as well as neurodegeneration. Extracts from plants of both genera showed evidence of vasodilation and thus, antihypertensive effects. Other therapeutic effects such as weight loss, postpartum and gastrointestinal healing from different plants of the genus Scurrula are documented. As the therapeutic effects of plants from Scurrula are still in exploration stage, there is currently no known clinical trial on these plants. However, there are few on-going clinical trials for Viscum album that demonstrate the functionalities of these mistletoes. Future work required for exploring the benefits of these plants and ways to develop both parasitic plants as a source of pharmacological drug are explained in this article.
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Affiliation(s)
- Ya Chee Lim
- Pengiran Anak Puteri Rashidah Sa'adatul Bolkiah Institute of Health Sciences, Universiti Brunei Darussalam, Jalan Tungku Link, BE 1410 Gadong, Brunei.
| | - Rajan Rajabalaya
- Pengiran Anak Puteri Rashidah Sa'adatul Bolkiah Institute of Health Sciences, Universiti Brunei Darussalam, Jalan Tungku Link, BE 1410 Gadong, Brunei.
| | - Shirley Huan Fang Lee
- Pengiran Anak Puteri Rashidah Sa'adatul Bolkiah Institute of Health Sciences, Universiti Brunei Darussalam, Jalan Tungku Link, BE 1410 Gadong, Brunei.
| | - Kushan U Tennakoon
- Institute for Biodiversity and Environmental Research (IBER), Universiti Brunei Darussalam, Jalan Tungku Link, BE 1410 Gadong, Brunei.
| | - Quang-Vuong Le
- Institute for Biodiversity and Environmental Research (IBER), Universiti Brunei Darussalam, Jalan Tungku Link, BE 1410 Gadong, Brunei.
- Biology Faculty, Vinh University, 182 Le Duan, 470000 Vinh City, Nghe An Province, Vietnam.
| | - Adi Idris
- Pengiran Anak Puteri Rashidah Sa'adatul Bolkiah Institute of Health Sciences, Universiti Brunei Darussalam, Jalan Tungku Link, BE 1410 Gadong, Brunei.
| | - Ihsan N Zulkipli
- Pengiran Anak Puteri Rashidah Sa'adatul Bolkiah Institute of Health Sciences, Universiti Brunei Darussalam, Jalan Tungku Link, BE 1410 Gadong, Brunei.
| | - Natasha Keasberry
- Faculty of Science, Universiti Brunei Darussalam, Jalan Tungku Link, BE 1410 Gadong, Brunei.
| | - Sheba R David
- Pengiran Anak Puteri Rashidah Sa'adatul Bolkiah Institute of Health Sciences, Universiti Brunei Darussalam, Jalan Tungku Link, BE 1410 Gadong, Brunei.
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Abstract
CONTEXT Drug-induced liver injury (DILI) represents a diverse set of responses following exposure to any manufactured or naturally occurring chemical compound. Drug-induced liver injury is of major concern owing to the ever increasing number of compounds introduced into the market for treatment of various diseases as well as the increasing popularity of herbals, which lend themselves to self-medication but are not rigorously regulated. OBJECTIVE To provide an overview of the prevalence, classification, and diagnosis of DILI with emphasis on pathogenesis and the role of a liver biopsy. To focus on the most common, emerging, and herbal agents that cause DILI with emphasis on the histologic pattern of injury observed. DATA SOURCES A review of the literature was drawn from the PubMed (US National Library of Medicine) repository, textbooks, and online databases. All figures were taken from cases seen at our tertiary referral center, which is 1 of 12 participating sites in the National Institutes of Health-funded Drug-Induced Liver Injury Network. CONCLUSIONS Drug-induced liver injury due to prescription, over-the-counter, and herbal products is a major cause of liver disease in the United States and around the world. Diagnosis of DILI is challenging because there is no single clinical, laboratory, or histologic feature specific to DILI. Accurate diagnosis requires establishing a causal relationship with the suspected agent and excluding competing causes of liver injury. The liver biopsy is an essential component in the management of DILI by offering clues to the underlying pathogenesis, providing prognostic information, and guiding therapy.
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Affiliation(s)
| | | | - Romil Saxena
- From the Department of Pathology and Laboratory Medicine (Drs Fisher and Ms Saxena)
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Role of natural antioxidants and potential use of bergamot in treating rheumatoid arthritis. PHARMANUTRITION 2015. [DOI: 10.1016/j.phanu.2015.03.002] [Citation(s) in RCA: 45] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
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Herbs and liver injury: a clinical perspective. Clin Gastroenterol Hepatol 2014; 12:1069-76. [PMID: 23924877 DOI: 10.1016/j.cgh.2013.07.030] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/08/2013] [Revised: 07/22/2013] [Accepted: 07/23/2013] [Indexed: 02/07/2023]
Abstract
Despite a perception that herbal and dietary supplements are safe, devastating liver injury has been reported to result from their use. The difficulty in characterizing liver injury attributable to herbal and dietary supplements stems from the permissive regulatory environment, the complexity of marketed products, and underreporting by the patients who use them. Despite these limitations, researchers, clinicians, and regulators have increasing awareness of the need for study in this area.
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Byun JK, Yoon BY, Jhun JY, Oh HJ, Kim EK, Min JK, Cho ML. Epigallocatechin-3-gallate ameliorates both obesity and autoinflammatory arthritis aggravated by obesity by altering the balance among CD4+ T-cell subsets. Immunol Lett 2013; 157:51-9. [PMID: 24239847 DOI: 10.1016/j.imlet.2013.11.006] [Citation(s) in RCA: 37] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/03/2013] [Revised: 11/01/2013] [Accepted: 11/04/2013] [Indexed: 11/19/2022]
Abstract
Epigallocatechin-3-gallate (EGCG) is the most biologically active catechin in green tea. EGCG has been shown to have therapeutic effects in autoinflammatory diseases and obesity. Obesity is currently regarded-partly-as an inflammatory condition because of the inflammatory cytokines and higher Th1 cell differentiation detected in obese animal models and human cohort studies. In this work, the effects of EGCG on diet-induced obesity (DIO) mice and obese collagen-induced arthritis (CIA) mice were investigated. EGCG reduced the body weight and fat infiltration in liver tissue while improving serum lipid profiles in DIO mice. EGCG also induced a higher Treg/Th17 cell ratio in CD4(+) T-cell differentiation by decreasing the ratio of STAT3/STAT5 expression in DIO mice. EGCG was also effective in obese CIA mice. Reducing Th17 cells and increasing regulatory T (Treg) cells by affecting the STAT protein ratio were important effects of EGCG that might result in improved arthritic scores and levels of several inflammatory indicators. Thus, EGCG has an anti-inflammatory effect by suppressing STAT3 proteins and Th17-cell differentiation. EGCG thus shows promise for treating autoimmune conditions related to STAT3 or Th17 cells, such as metabolic syndrome, inflammatory arthritis, and some neoplastic diseases.
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Affiliation(s)
- Jae-Kyeong Byun
- The Rheumatism Research Center, Catholic Research Institute of Medical Science, The Catholic University of Korea Seoul, South Korea
| | - Bo-Young Yoon
- Department of Internal Medicine, Inje University Ilsan Paik Hospital, Goyang 411-706, Republic of Korea
| | - Joo-Yeon Jhun
- The Rheumatism Research Center, Catholic Research Institute of Medical Science, The Catholic University of Korea Seoul, South Korea
| | - Hye-Joa Oh
- The Rheumatism Research Center, Catholic Research Institute of Medical Science, The Catholic University of Korea Seoul, South Korea
| | - Eun-kyoung Kim
- The Rheumatism Research Center, Catholic Research Institute of Medical Science, The Catholic University of Korea Seoul, South Korea
| | - Jun-Ki Min
- The Rheumatism Research Center, Catholic Research Institute of Medical Science, The Catholic University of Korea Seoul, South Korea
| | - Mi-La Cho
- The Rheumatism Research Center, Catholic Research Institute of Medical Science, The Catholic University of Korea Seoul, South Korea; Conversant Research Consortium in Immunologic Disease, College of Medicine, The Catholic University of Korea Seoul, South Korea.
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Bhardwaj P, Khanna D. Green tea catechins: defensive role in cardiovascular disorders. Chin J Nat Med 2013; 11:345-53. [DOI: 10.1016/s1875-5364(13)60051-5] [Citation(s) in RCA: 44] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/19/2013] [Indexed: 10/26/2022]
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Quesille-Villalobos AM, Torrico JS, Ranilla LG. Phenolic compounds, antioxidant capacity, andin vitro α-amylase inhibitory potential of tea infusions (Camellia sinensis) commercialized in Chile. CYTA - JOURNAL OF FOOD 2013. [DOI: 10.1080/19476337.2012.688219] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
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Wong DZH, Kadir HA, Ling SK. Bioassay-guided isolation of neuroprotective compounds from Loranthus parasiticus against H₂O₂-induced oxidative damage in NG108-15 cells. JOURNAL OF ETHNOPHARMACOLOGY 2012; 139:256-264. [PMID: 22107836 DOI: 10.1016/j.jep.2011.11.010] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/02/2011] [Revised: 10/24/2011] [Accepted: 11/07/2011] [Indexed: 05/31/2023]
Abstract
ETHNOPHARMACOLOGICAL RELEVANCE A parasite plant, Loranthus parasiticus (Loranthaceae), which is generally known as benalu teh (in Malay), Sang Ji Sheng (in Chinese), and baso-kisei (in Japan) distributed in south and southwest part of China, has been used as a folk medicine for the treatment of schizophrenia in southwest China. Loranthus parasiticus has various uses in folk and traditional medicines for bone, brain, kidney, liver, expels wind-damp, and prevents miscarriage. AIM OF THE STUDY The current study was designed to evaluate the neuroprotective activity of Loranthus parasiticus against hydrogen peroxide (H(2)O(2))-induced oxidative damage in NG108-15 hybridoma cells, so as to present evidence for the traditional use of this parasite plant in the treatment of oxidative stress related neurodegenerative diseases. MATERIALS AND METHODS Dried and ground leaves of Loranthus parasiticus were extracted and fractionated into Loranthus parasiticus ethanol extract (LPEE), Loranthus parasiticus ethyl acetate fraction (LPEAF), and Loranthus parasiticus aqueous fraction (LPAF), which were subjected to neuroprotective activity assessment by 3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide (MTT) cell viability assay. Bioassay-guided fractionation and isolation was performed subsequently to identify the most neuroactive compound. Mechanism studies underlying the present neuroprotection model of the isolated neuroactive compound was evaluated by employing 2,7-dichlorofluorescein diacetate (DCFH-DA) for intracellular reactive oxygen species (ROS) measurement, annexin V/propidium iodide (PI) for translocation of membrane phosphatidyleserine to identify cells undergo apoptosis, 5,5',6,6'-tetrachloro-1,1',3,3' tetraethylbenzimidazolylcarbocyanine iodide (JC-1) for mitochondrial membrane potential (MMP) detection, and PI for cell cycle events analysis. RESULTS Among those tested extract and fractions (LPEE, LPEAF, and LPAF) in our previous screening, LPAF significantly (P<0.01) yielded the highest neuroprotective activity with 78.00±1.85% cell viability in a dose dependent manner, supporting a neuroprotective role for LPAF in vitro. AC trimer and (+)-catechin have been isolated from LPAF successfully through bioassay-guided fractionation and isolation approach and (+)-catechin exhibited stronger neuroprotective activity as compared with AC trimer. (+)-Catechin increased cell viability and decreased the level of intracellular reactive oxygen species (ROS) in a dose-dependent manner against H(2)O(2)-induced oxidative stress in NG108-15 cells. Moreover, (+)-catechin reduced total annexin V positive cells (early and late apoptotic cells), attenuated the collapsed of MMP, and inhibited cell cycle arrested at sub-G(1) population following H(2)O(2) insult. CONCLUSION Collectively, the use of Loranthus parasiticus as folk medicine in the treatment of mental disorder was attributed to the presence of proanthocyanidins in this parasite plant. These findings support the traditional use of Loranthus parasiticus which is capable in managing neurological disorder where oxidative stress is implicated.
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Affiliation(s)
- Daniel Zin Hua Wong
- Biomolecular Research Group, Biochemistry Program, Institute of Biological Sciences, Faculty of Science, University of Malaya, 50603 Kuala Lumpur, Malaysia
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Ghassempour A, Mollayi S, Farzaneh M, Sharifi-Tehrani A, Aboul-Enein HY. Variation of Catechin, epicatechin and their enantiomers concentrations before and after wheat cultivar-Puccinia triticina infection. Food Chem 2011. [DOI: 10.1016/j.foodchem.2010.10.028] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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Lockwood GB. The quality of commercially available nutraceutical supplements and food sources. ACTA ACUST UNITED AC 2010; 63:3-10. [PMID: 21155809 DOI: 10.1111/j.2042-7158.2010.01159.x] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
Abstract
OBJECTIVES Nutraceuticals are components of dietary origin, with claimed beneficial therapeutic activities. The quality of nutraceuticals is paramount for efficacy and safety, and it includes quality of raw materials, different available chemical forms, complex products, lack of substitution of inappropriate materials, and the absence of contaminants. The aim of this review is to investigate the extent of substandard formulated and raw material nutraceuticals, and to highlight any consequent health concern. KEY FINDINGS Reports of the quality of raw materials have revealed wide variations, often as a result of lack of clear regulatory definitions with respect to size of polymeric entities and also presence of glycosidic and salt forms. Published evaluations of over 70 formulations of 25 different nutraceuticals revealed variable quality; no nutraceutical showed consistent high quality, but a number revealed consistent low quality, thereby making the case for closer regulation of manufacturers. Whole food sources have also been shown to be widely variable in constituent levels. The effect of different formulations requires consideration, as the different types have been shown to have marked effects on bioavailability. SUMMARY The poor quality of commercially available nutraceuticals has been highlighted. In addition, incidences of side effects and drug interactions are increasing, as consumption of nutraceuticals rises. Pharmacists and health practitioners need to be aware of the scientific literature to advise accordingly.
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Affiliation(s)
- G Brian Lockwood
- School of Pharmacy and Pharmaceutical Sciences, University of Manchester, Manchester, UK.
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Tilton R, Paiva AA, Guan JQ, Marathe R, Jiang Z, van Eyndhoven W, Bjoraker J, Prusoff Z, Wang H, Liu SH, Cheng YC. A comprehensive platform for quality control of botanical drugs (PhytomicsQC): a case study of Huangqin Tang (HQT) and PHY906. Chin Med 2010; 5:30. [PMID: 20727161 PMCID: PMC2940884 DOI: 10.1186/1749-8546-5-30] [Citation(s) in RCA: 67] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/09/2010] [Accepted: 08/20/2010] [Indexed: 11/21/2022] Open
Abstract
Background Establishing botanical extracts as globally-accepted polychemical medicines and a new paradigm for disease treatment, requires the development of high-level quality control metrics. Based on comprehensive chemical and biological fingerprints correlated with pharmacology, we propose a general approach called PhytomicsQC to botanical quality control. Methods Incorporating the state-of-the-art analytical methodologies, PhytomicsQC was employed in this study and included the use of liquid chromatography/mass spectrometry (LC/MS) for chemical characterization and chemical fingerprinting, differential cellular gene expression for bioresponse fingerprinting and animal pharmacology for in vivo validation. A statistical pattern comparison method, Phytomics Similarity Index (PSI), based on intensities and intensity ratios, was used to determine the similarity of the chemical and bioresponse fingerprints among different manufactured batches. Results Eighteen batch samples of Huangqin Tang (HQT) and its pharmaceutical grade version (PHY906) were analyzed using the PhytomicsQC platform analysis. Comparative analysis of the batch samples with a clinically tested standardized batch obtained values of PSI similarity between 0.67 and 0.99. Conclusion With rigorous quality control using analytically sensitive and comprehensive chemical and biological fingerprinting, botanical formulations manufactured under standardized manufacturing protocols can produce highly consistent batches of products.
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Affiliation(s)
- Robert Tilton
- Department of Pharmacology, Yale University School Of Medicine, New Haven, CT 06510, USA.
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20
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Bioactive components of tea: cancer, inflammation and behavior. Brain Behav Immun 2009; 23:721-31. [PMID: 19258034 DOI: 10.1016/j.bbi.2009.02.013] [Citation(s) in RCA: 143] [Impact Index Per Article: 9.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/05/2009] [Revised: 02/21/2009] [Accepted: 02/22/2009] [Indexed: 11/21/2022] Open
Abstract
Tea is one of the most widely consumed beverages worldwide. Several studies have suggested that catechins and theaflavins found in tea may reduce the risk of various types of cancers. Major advances have been made to understand the molecular events leading to cancer prevention; however, the evidence is not conclusive. Evidence from pre-clinical and clinical studies also suggests that persistent inflammation can progress to cancer. Several possible mechanisms of action may explain the cancer preventive aspects of tea components specifically anti-inflammatory effects. In regards to brain health, green tea catechins have been recognized as multifunctional compounds for neuroprotection with beneficial effects on vascular function and mental performance. Theanine, a unique amino acid in tea, enhances cognition in humans and has neuroprotective effects. Human interventional studies with well characterized tea products are needed.
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Abstract
Tea is the most consumed beverage in the world. Tea polyphenols are the major constituents of tea leaves and have shown many potential healthy benefits. However, whether tea polyphenols influence ovarian follicle assembly and development and ovarian life span is unknown. To study the effect of tea polyphenols on ovarian follicle development and oocyte apoptosis, we investigated rat ovarian development of different ages [from postnatal day (PD)1 after birth to 10 months] after treatment with tea polyphenols. Our data showed that the percentage of unassembled follicles increased in the ovaries of 1- and 2-day-old rats which were ip injected with tea polyphenols (50 mg/kg/d) or whose mothers were treated with tea polyphenols (100 mg/kg/d) by intragastric administration from the day 11 after the detection of vaginal plug till delivery. The percentage of primordial follicles increased, while that of developing follicles decreased in the ovaries of 4- and 8-day-old rats following peritoneal injection with tea polyphenols compared with controls. The ratio of terminal deoxynucleotidyltransferase-mediated dUTP nick-end labeling (TUNEL)-positive oocytes decreased in the ovaries of neonatal rats following tea polyphenol treatment. In the 3- and 10-month-old rat ovaries, the number of primordial follicles augmented, whereas that of atretic follicles decreased after the treatment for 4 weeks. These data suggest that tea polyphenols may inhibit the transition from primordial to developing follicles, extend the entire growth phase of a follicle, and reduce dominant follicle numbers per cycle to increase the reserve of germ cells, inhibit oocyte apoptosis and follicle atresia during ovarian development from birth to early aged, and retard climacterium in rats. Drinking even a small cup of tea per day may benefit to extent the productive life of ovary.
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Affiliation(s)
- L L Luo
- Department of Gynaecology and Obstetrics, The First Affiliated Hospital of Shantou University Medical College, Guangdong, P.R. China.
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Gagnier JJ, Boon H, Rochon P, Moher D, Barnes J, Bombardier C. Recommendations for reporting randomized controlled trials of herbal interventions: explanation and elaboration. J Clin Epidemiol 2006; 59:1134-49. [PMID: 17027423 DOI: 10.1016/j.jclinepi.2005.12.020] [Citation(s) in RCA: 141] [Impact Index Per Article: 7.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/18/2005] [Revised: 12/10/2005] [Accepted: 12/16/2005] [Indexed: 10/24/2022]
Abstract
Controlled trials that use randomized allocation are the best tool to control for bias and confounding in trials testing clinical interventions. Investigators must be sure to include information that is required by the reader to judge the validity and implications of the findings in the reports of these trials. In part, complete reporting of trials will allow clinicians to modify their clinical practice to reflect current evidence toward the improvement of clinical outcomes. The consolidated standards of reporting trials (CONSORT) statement was developed to assist investigators, authors, reviewers, and editors on the necessary information to be included in reports of controlled clinical trials. The CONSORT statement is applicable to any intervention, including herbal medicinal products. Controlled trials of herbal interventions do not adequately report the information suggested in CONSORT. Recently, reporting recommendations were developed in which several CONSORT items were elaborated to become relevant and complete for randomized controlled trials of herbal medicines. We expect that these recommendations will lead to more complete and accurate reporting of herbal trials. We wrote this explanatory document to outline the rationale for each recommendation and to assist authors in using them by providing the CONSORT items and the associated elaboration, together with examples of good reporting and empirical evidence, where available, for each. These recommendations for the reporting of herbal medicinal products presented here are open to revision as more evidence accumulates and critical comments are collected.
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Affiliation(s)
- Joel J Gagnier
- Department of Health Policy, Management and Evaluation, Faculty of Medicine, University of Toronto, Toronto, Ontario, Canada.
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23
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Gagnier J, Boon H, Rochon P, Barnes J, Moher D, Bombardier C. Improving the quality of reporting of randomized controlled trials evaluating herbal interventions: implementing the CONSORT statement [corrected]. Explore (NY) 2006; 2:143-9. [PMID: 16781628 DOI: 10.1016/j.explore.2005.12.003] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/11/2005] [Indexed: 11/22/2022]
Abstract
BACKGROUND Given that herbal medicinal products are widely used, vary greatly in content and quality, and are actively tested in randomized controlled trials (RCTs), such RCTs must clearly report the specifics of the intervention. OBJECTIVE Our objective was to develop recommendations for reporting RCTs of herbal medicine interventions. METHODS We identified and invited potential participants with expertise in clinical trial methodology, clinical trial reporting, pharmacognosy, herbal medicinal products, medical statistics, and/or herbal product manufacturing to participate in phone calls and a consensus meeting. Three phases were conducted: (1) Premeeting item generation via telephone calls, (2) Consensus meeting, and (3) Postmeeting feedback. Sixteen experts participated in premeeting phone calls for item generation, and 14 participants attended a consensus meeting in Toronto, Ontario, Canada, in June of 2004. During the consensus meeting, a modified Delphi technique was used to aid discussion and debate of information required for reporting RCTs of herbal medicines. RESULTS After extensive discussion, the group decided that context-specific elaborations of nine Consolidated Standards of Reporting Trials (CONSORT) items to RCTs of herbal medicines were necessary: Item 1 (Title and Abstract), 2 (Background), 3 (Participants), 4 (Interventions), 6 (Outcomes), 15 (Baseline data), 20 (Interpretation), 21 (Generalizability), and 22 (Overall evidence). DISCUSSION The elaboration of item 4 of the CONSORT statement outlines specific information required for complete reporting of the herbal medicine intervention. The reporting suggestions presented will support clinical trialists, editors, and reviewers in reporting and reviewing RCTs of herbal medicines and readers in interpreting the results.
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Affiliation(s)
- Joel Gagnier
- Department of Health Policy, Management and Evaluation, Department of Medicine, Univerity of Toronto, Toronto, Canada.
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Weiss DJ, Austria EJ, Anderton CR, Hompesch R, Jander A. Analysis of green tea extract dietary supplements by micellar electrokinetic chromatography. J Chromatogr A 2006; 1117:103-8. [PMID: 16600259 DOI: 10.1016/j.chroma.2006.03.057] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/27/2005] [Revised: 03/07/2006] [Accepted: 03/20/2006] [Indexed: 11/26/2022]
Abstract
Dietary supplements are growing in popularity as a source of catechins such as epigallocatechin gallate (EGCG). The first determination of five catechins in green tea extract dietary supplements using an extraction followed by micellar electrokinetic chromatography (MEKC) with UV detection is presented here. The optimum run buffer is 5 mM borate-60 mM phosphate with 50 mM SDS at pH 7.00 with detection at 210 nm. The limit of detection is 2-3 microg/mL (S/N=3) and the limit of quantitation is 6-8 microg/mL (S/N = 10). Results indicate that the amount of catechins varies greatly among manufacturers, between capsules of the same manufacturers, and between batches.
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Affiliation(s)
- David J Weiss
- Department of Chemistry, University of Colorado at Colorado Springs, Colorado Springs, CO 80918, USA.
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25
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Seeram NP, Henning SM, Niu Y, Lee R, Scheuller HS, Heber D. Catechin and caffeine content of green tea dietary supplements and correlation with antioxidant capacity. JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY 2006; 54:1599-603. [PMID: 16506807 DOI: 10.1021/jf052857r] [Citation(s) in RCA: 153] [Impact Index Per Article: 8.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/06/2023]
Abstract
The health benefits associated with tea consumption have resulted in the wide inclusion of green tea extracts in botanical dietary supplements, which are widely consumed as adjuvants for complementary and alternative medicines. Tea contains polyphenols such as catechins or flavan-3-ols including epicatechin, epigallocatechin, epicatechin gallate, and epigallocatechin gallate (EGCG), as well as the alkaloid, caffeine. Polyphenols are antioxidants, and EGCG, due to its high levels, is widely accepted as the major antioxidant in green tea. Therefore, commercial green tea dietary supplements (GTDS) may be chemically standardized to EGCG levels and/or biologically standardized to antioxidant capacity. However, label claims on GTDS may not correlate with actual phytochemical content or antioxidant capacity nor provide information about the presence and levels of caffeine. In the current study, 19 commonly available GTDS were evaluated for catechin and caffeine content (using high-performance liquid chromatography) and for antioxidative activity [using trolox equivalent antioxidant capacity (TEAC) and oxygen radical antioxidant capacity (ORAC) assays]. Product labels varied in the information provided and were inconsistent with actual phytochemical contents. Only seven of the GTDS studied made label claims of caffeine content, 11 made claims of EGCG content, and five specified total polyphenol content. Caffeine, EGCG, and total polyphenol contents in the GTDS varied from 28 to 183, 12-143, and 14-36% tablet or capsule weight, respectively. TEAC and ORAC values for GTDS ranged from 187 to 15340 and from 166 to 13690 mumol Trolox/g for tablet or capsule, respectively. The antioxidant activities for GTDS determined by TEAC and ORAC were well-correlated with each other and with the total polyphenol content. Reliable labeling information and standardized manufacturing practices, based on both chemical standardization and biological assays, are recommended for the quality control of botanical dietary supplements.
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Affiliation(s)
- Navindra P Seeram
- Center for Human Nutrition, David Geffen School of Medicine, University of California, Los Angeles, California 90095, USA.
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Sutherland BA, Rahman RMA, Appleton I. Mechanisms of action of green tea catechins, with a focus on ischemia-induced neurodegeneration. J Nutr Biochem 2005; 17:291-306. [PMID: 16443357 DOI: 10.1016/j.jnutbio.2005.10.005] [Citation(s) in RCA: 216] [Impact Index Per Article: 11.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/24/2005] [Accepted: 10/11/2005] [Indexed: 02/02/2023]
Abstract
Catechins are dietary polyphenolic compounds associated with a wide variety of beneficial health effects in vitro, in vivo and clinically. These therapeutic properties have long been attributed to the catechins' antioxidant and free radical scavenging effects. Emerging evidence has shown that catechins and their metabolites have many additional mechanisms of action by affecting numerous sites, potentiating endogenous antioxidants and eliciting dual actions during oxidative stress, ischemia and inflammation. Catechins have proven to modulate apoptosis at various points in the sequence, including altering expression of anti- and proapoptotic genes. Their anti-inflammatory effects are activated through a variety of different mechanisms, including modulation of nitric oxide synthase isoforms. Catechins' actions of attenuating oxidative stress and the inflammatory response may, in part, account for their confirmed neuroprotective capabilities following cerebral ischemia. The versatility of the mechanisms of action of catechins increases their therapeutic potential as interventions for numerous clinical disorders. However, more epidemiological and clinical studies need to be undertaken for their efficacy to be fully elucidated.
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Affiliation(s)
- Brad A Sutherland
- Department of Pharmacology and Toxicology, University of Otago, Dunedin, P.O. Box 913, Dunedin, New Zealand
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Bolarinwa A, Linseisen J. Validated application of a new high-performance liquid chromatographic method for the determination of selected flavonoids and phenolic acids in human plasma using electrochemical detection. J Chromatogr B Analyt Technol Biomed Life Sci 2005; 823:143-51. [PMID: 16019270 DOI: 10.1016/j.jchromb.2005.06.024] [Citation(s) in RCA: 34] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/04/2004] [Revised: 06/08/2005] [Accepted: 06/10/2005] [Indexed: 11/29/2022]
Abstract
We developed a sensitive method for determination of 23 flavonoids and phenolic acids, which represent phenolic acids and five subclasses of flavonoids. Plasma samples were extracted with selective solid-phase-extraction columns and separated by RP-high-performance liquid chromatography (HPLC). For detection an electrochemical detector was used. Identification and test of purity were carried out via retention times and spectra analyses. Limits of detection varied from 1.45 to 22.27 nmol/l. Recovery varied from 81% to 106%. Reproducibility for all analytes was below 10% (coefficient of variation, CV (%)) and ranged between 3.1% and 9.8%. This method can be applied to samples from interventional studies as well as observational studies.
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Affiliation(s)
- Adrian Bolarinwa
- Unit of Human Nutrition and Cancer Prevention, Centre of Life Science, Technical University Munich, Alte Akademie 16, 85350 Freising-Weihenstephan, Germany
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Huang Q, Wu LJ, Tashiro SI, Gao HY, Onodera S, Ikejima T. (+)-Catechin, an Ingredient of Green Tea, Protects Murine Microglia From Oxidative Stress-Induced DNA Damage and Cell Cycle Arrest. J Pharmacol Sci 2005; 98:16-24. [PMID: 15879681 DOI: 10.1254/jphs.fpj04053x] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022] Open
Abstract
Extracts of Chinese herbs have been demonstrated to inhibit oxidative stress in vitro. In this study, we investigated the mechanism of (+)-catechin, isolated from green tea, which preserved murine microglia N9 cells from an oxidative agent tert-butylhydroperoxide (tBHP)-induced cell death. (+)-Catechin augmented the cell survival ratio after exposure to tBHP. Protective action of this drug was more efficacious than that of N-acetylcysteine, which is a putative antioxidant. DNA damage, detected by the Comet assay, was diminished with treatment of the drug. Results of flow cytometric analysis showed that the amount of intracellular *OH was decreased, and the cell cycle arrest was reversed by down-regulation of p53 phosphorylation after treatment with (+)-catechin. The reduced p53 activity followed the impairment of NF-kappaB translocation to the nuclear region. Then the phosphorylation of extracellular signal regulated protein kinase, a cell survival facilitative signal, was upregulated at the later stage. Taken together, (+)-catechin inhibited tBHP-induced translocation of NF-kappaB to improve cellular survival.
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Affiliation(s)
- Qing Huang
- China-Japan Research Institute of Medical and Pharmaceutical Sciences, Shenyang Pharmaceutical University, Shenyang 110016, China
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