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Ma ZT, Shi Z, Xiao XH, Wang JB. New Insights into Herb-Induced Liver Injury. Antioxid Redox Signal 2023; 38:1138-1149. [PMID: 36401515 PMCID: PMC10259609 DOI: 10.1089/ars.2022.0134] [Citation(s) in RCA: 7] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/31/2022] [Revised: 11/07/2022] [Accepted: 11/15/2022] [Indexed: 11/21/2022]
Abstract
Significance: Herbs are widely used worldwide. However, inappropriate use of some of the herbs can lead to herb-induced liver injury (HILI). Intriguingly, HILI incidents are on the rise, and our understanding of the underlying etiologies is in progress, and hence, an update on the current status of incidents as well as our understanding on the etiologies of HILI is appropriate. Recent Advances: HILI reports due to the use of some herbs that are traditionally considered to be safe are also on the rise. Furthermore, HILI due to the use of certain herbs in combination with other herbs (herb-herb interaction [HHI]) or non-herb components (herb-drug interaction [HDI]) has also been reported, suggesting a potentially important new type of inappropriate use of herbs. Critical Issues: Updated overviews focus on the epidemiology, etiology, phenotypes, and risk factors of HILI, as well as HDI and HHI, and analysis on several types of newly reported "toxic" effects of herbs based on types of hepatotoxicity and the HILI mechanisms. Future Directions: HILI will continue to be a significant public health challenge in the near future. In the light of the lack of broadly available guidelines and regulations for proper and safe uses of herbs worldwide, raising the public awareness of HILI will remain one of the most effective measures. In particular, it should include a better understanding of the contributing factors; a more detail subclassification and description of HILI, better characterization of the components/substances that could induce HILI; and development of HILI diagnosis based on the Roussel Uclaf Causality Assessment Method (RUCAM). Antioxid. Redox Signal. 38, 1138-1149.
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Affiliation(s)
- Zhi-Tao Ma
- Department of Pharmaceutics of Chinese Materia Medica, School of Traditional Chinese Medicine, Capital Medical University, Beijing, China
| | - Zhuo Shi
- China Military Institute of Chinese Medicine, Fifth Medical Center of PLA General Hospital, Beijing, China
| | - Xiao-He Xiao
- China Military Institute of Chinese Medicine, Fifth Medical Center of PLA General Hospital, Beijing, China
| | - Jia-Bo Wang
- Department of Pharmaceutics of Chinese Materia Medica, School of Traditional Chinese Medicine, Capital Medical University, Beijing, China
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2
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Han Y, Park HJ, Hong MK, Shin MR, Roh SS, Kwon EY. Artemisiae argyi Water Extract Alleviates Obesity-Induced Metabolic Disorder. Curr Issues Mol Biol 2022; 44:6158-6171. [PMID: 36547081 PMCID: PMC9776687 DOI: 10.3390/cimb44120420] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/06/2022] [Revised: 11/28/2022] [Accepted: 12/02/2022] [Indexed: 12/12/2022] Open
Abstract
Artemisiae argyi is a well-known traditional herbal medicine used in East Asia. Although the antibacterial and anti-inflammatory effects of A. argyi have been reported, its efficacy in improving obesity has not been yet evaluated. In this study, mice were fed a normal diet (AIN-93), a high-fat diet (HFD, 60% of kcal from fat), and an HFD with 0.1% of A. argyi water extract for 16 weeks. The body weight and body fat in A. argyi-fed mice significantly decreased via upregulation of the mRNA expression of fatty acid oxidation-related genes, with a simultaneous decrease in plasma lipid content and leptin levels. A. argyi water extract also ameliorated hepatic steatosis by restricting lipogenesis via lowering the activities of fatty acid synthase and phosphatidic acid phosphatase. Consistently, hepatic histological analysis indicated that A. argyi water extract decreased hepatic lipid accumulation in accordance with the hepatic H, E and Oil Red O-stained area. Additionally, A. argyi ameliorated the impaired glucose homeostasis by increasing the mRNA expression of AMP-activated kinase and glycolysis-related genes. In conclusion, our results indicate that A. argyi can be used to treat obesity-related metabolic conditions.
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Affiliation(s)
- Youngji Han
- Department of Food Science and Nutrition, Kyungpook National University, 1370 San-Kyuk Dong Puk-Ku, Daegu 41566, Republic of Korea
- Center for Food and Nutritional Genomics Research, Kyungpook National University, 1370 San-Kyuk Dong Puk-Ku, Daegu 41566, Republic of Korea
- Center for Beautiful Aging, Kyungpook National University, 1370 San-Kyuk Dong Puk-Ku, Daegu 41566, Republic of Korea
- Raydel Research Institute, 76, Dongnae-ro, Dong-gu, Daegu 41061, Republic of Korea
| | - Hae-Jin Park
- Bio Convergence Testing Center, Daegu Haany University, 1 Haanydaero, Gyeongsan-si 38610, Republic of Korea
| | - Min-Kyeong Hong
- Department of Food Science and Nutrition, Kyungpook National University, 1370 San-Kyuk Dong Puk-Ku, Daegu 41566, Republic of Korea
- Center for Food and Nutritional Genomics Research, Kyungpook National University, 1370 San-Kyuk Dong Puk-Ku, Daegu 41566, Republic of Korea
- Center for Beautiful Aging, Kyungpook National University, 1370 San-Kyuk Dong Puk-Ku, Daegu 41566, Republic of Korea
| | - Mi-Rae Shin
- Department of Herbology, College of Korean Medicine, Daegu Haany University, 64 Gil, 136, sinsincheondo-ro, Suseong-gu, Daegu 42158, Republic of Korea
| | - Seong-Soo Roh
- Department of Herbology, College of Korean Medicine, Daegu Haany University, 64 Gil, 136, sinsincheondo-ro, Suseong-gu, Daegu 42158, Republic of Korea
- Correspondence: (S.-S.R.); (E.-Y.K.)
| | - Eun-Young Kwon
- Department of Food Science and Nutrition, Kyungpook National University, 1370 San-Kyuk Dong Puk-Ku, Daegu 41566, Republic of Korea
- Center for Food and Nutritional Genomics Research, Kyungpook National University, 1370 San-Kyuk Dong Puk-Ku, Daegu 41566, Republic of Korea
- Center for Beautiful Aging, Kyungpook National University, 1370 San-Kyuk Dong Puk-Ku, Daegu 41566, Republic of Korea
- Correspondence: (S.-S.R.); (E.-Y.K.)
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3
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Mao JJ, Pillai GG, Andrade CJ, Ligibel JA, Basu P, Cohen L, Khan IA, Mustian KM, Puthiyedath R, Dhiman KS, Lao L, Ghelman R, Cáceres Guido P, Lopez G, Gallego-Perez DF, Salicrup LA. Integrative oncology: Addressing the global challenges of cancer prevention and treatment. CA Cancer J Clin 2022; 72:144-164. [PMID: 34751943 DOI: 10.3322/caac.21706] [Citation(s) in RCA: 132] [Impact Index Per Article: 66.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/21/2021] [Revised: 10/04/2021] [Accepted: 10/05/2021] [Indexed: 12/15/2022] Open
Abstract
The increase in cancer incidence and mortality is challenging current cancer care delivery globally, disproportionally affecting low- and middle-income countries (LMICs) when it comes to receiving evidence-based cancer prevention, treatment, and palliative and survivorship care. Patients in LMICs often rely on traditional, complementary, and integrative medicine (TCIM) that is more familiar, less costly, and widely available. However, spheres of influence and tensions between conventional medicine and TCIM can further disrupt efforts in evidence-based cancer care. Integrative oncology provides a framework to research and integrate safe, effective TCIM alongside conventional cancer treatment and can help bridge health care gaps in delivering evidence-informed, patient-centered care. This growing field uses lifestyle modifications, mind and body therapies (eg, acupuncture, massage, meditation, and yoga), and natural products to improve symptom management and quality of life among patients with cancer. On the basis of this review of the global challenges of cancer control and the current status of integrative oncology, the authors recommend: 1) educating and integrating TCIM providers into the cancer control workforce to promote risk reduction and culturally salient healthy life styles; 2) developing and testing TCIM interventions to address cancer symptoms or treatment-related adverse effects (eg, pain, insomnia, fatigue); and 3) disseminating and implementing evidence-based TCIM interventions as part of comprehensive palliative and survivorship care so patients from all cultures can live with or beyond cancer with respect, dignity, and vitality. With conventional medicine and TCIM united under a cohesive framework, integrative oncology may provide citizens of the world with access to safe, effective, evidence-informed, and culturally sensitive cancer care.
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Affiliation(s)
- Jun J Mao
- Bendheim Integrative Medicine Center, Memorial Sloan Kettering Cancer Center, New York, New York
| | - Geetha Gopalakrishna Pillai
- Traditional, Complementary and Integrative Medicine Unit, Service Delivery and Safety Department, World Health Organization, Geneva, Switzerland
| | | | - Jennifer A Ligibel
- Leonard P. Zakim Center for Integrative Therapies and Healthy Living, Dana-Farber Cancer Institute, Boston, Massachusetts
- Harvard Medical School, Boston, Massachusetts
| | - Partha Basu
- International Agency for Research on Cancer, World Health Organization, Lyon, France
| | - Lorenzo Cohen
- Integrative Medicine Program, Department of Palliative, Rehabilitation and Integrative Medicine, The University of Texas MD Anderson Cancer Center, Houston, Texas
| | - Ikhlas A Khan
- National Center for Natural Products Research, University of Mississippi, Jackson, Mississippi
| | - Karen M Mustian
- Wilmot Cancer Institute, Department of Surgery, University of Rochester Medical Center, Rochester, New York
| | | | | | - Lixing Lao
- Virginia University of Integrative Medicine, Fairfax, Virginia
| | - Ricardo Ghelman
- Brazilian Academic Consortium for Integrative Health, University of São Paulo, São Paulo, Brazil
| | - Paulo Cáceres Guido
- Pharmacokinetics and Research in Clinical Pharmacology and Integrative Medicine Group, Garrahan Pediatric Hospital, Buenos Aires, Argentina
- Traditional, Complementary, and Integrative Medicine Network of the Americas, São Paulo, Brazil
| | - Gabriel Lopez
- Integrative Medicine Program, Department of Palliative, Rehabilitation and Integrative Medicine, The University of Texas MD Anderson Cancer Center, Houston, Texas
| | - Daniel F Gallego-Perez
- Traditional, Complementary, and Integrative Medicine Network of the Americas, São Paulo, Brazil
- Boston University School of Public Health, Boston, Massachusetts
| | - Luis Alejandro Salicrup
- Center for Global Health and Office of Cancer Complementary and Alternative Medicine, Division of Cancer Treatment and Diagnosis, National Cancer Institute, National Institutes of Health, Rockville, Maryland
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de Lima LP, de Paula Barbosa A. A review of the lipolytic effects and the reduction of abdominal fat from bioactive compounds and moro orange extracts. Heliyon 2021; 7:e07695. [PMID: 34409177 PMCID: PMC8361066 DOI: 10.1016/j.heliyon.2021.e07695] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/08/2021] [Revised: 06/23/2021] [Accepted: 07/28/2021] [Indexed: 11/20/2022] Open
Abstract
Dietary supplementation containing Citrus sinensis extract is being widely used for weight loss due to its anti-adipogenic and antioxidant effects that regulate the metabolism of fatty acids. Bioactive compounds upregulate PPARα in the liver tissue, increasing oxidation of fatty acids and improving insulin sensitivity in addition to decreasing the expression of genes involved in the synthesis of fatty acids, such as LXRα and FAS. Studies on synephrine demonstrated their ability to stimulate the development of beige adipose tissue through greater expression of UCP1 and mtTFA, contributing to an increase in thermogenesis and mitochondrial biogenesis. However, despite its widespread use to reduce abdominal fat, few scientific studies have consensually proven the effectiveness of Moro orange extract for weight loss. This literature review summarizes the current information on the pharmacological and molecular mechanisms involved in the modulation of lipid metabolism by the bioactive compounds present in Moro orange extract.
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Affiliation(s)
- Lucas Pinheiro de Lima
- Faculdade Ana Carolina Puga (FAPUGA), Av. Braz Olaia Acosta, 1.900/ 109, Ribeirão Preto, 14026-610, São Paulo, Brazil
| | - Antony de Paula Barbosa
- Faculdade Ana Carolina Puga (FAPUGA), Av. Braz Olaia Acosta, 1.900/ 109, Ribeirão Preto, 14026-610, São Paulo, Brazil
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Salari S, Amiri MS, Ramezani M, Moghadam AT, Elyasi S, Sahebkar A, Emami SA. Ethnobotany, Phytochemistry, Traditional and Modern Uses of Actaea racemosa L. (Black cohosh): A Review. ADVANCES IN EXPERIMENTAL MEDICINE AND BIOLOGY 2021; 1308:403-449. [PMID: 33861455 DOI: 10.1007/978-3-030-64872-5_24] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
Abstract
Actaea racemosa (AR) also known as Cimicifuga racemosa, is a perennial plant from Ranunculaceae family which was used as traditional remedies in treatment of various condition like rheumatoid muscular pain, headache, inflammation and dysmenorrhea. Actaea racemosa was basically native to Canada and the Eastern United State. This chapter proposed the ethnopharmacological uses of Actaea racemosa, and its phytochemical properties. Specifically, in this article we focused on use of Actaea racemose for menopausal and post-menopausal symptoms management. Electronic databases including PubMed and Scopus were searched for studies on Actaea racemose and its administration in management of menopausal symptoms. Chem Office software was also used in order to find chemical structures. The key words used as search terms were Cimicifuga racemose, Actaea racemose, Ranunculaceae, Black cohosh, Menopausal symptoms. We have included all relevant animal and human studies up to the date of publication. The analysis on Actaea racemose showed various indications for different plant's extracts. Approximately 131 chemical compounds have been isolated and identified from Actaea racemosa. According to recently studies, the most important chemicals known of the Actaea racemosa are phenolic compounds, chromones, triterpenoids, nitrogen-containing constituents. In addition, in vivo and in vitro studies reported wide range of pharmacological activities for Black cohosh like attenuating menopausal symptoms. Mechanism of action for some ethnomedicinal indications were made clear while some of its activities are not confirmed by pharmacological studies yet. Further investigations on its pharmacological properties are necessary to expand its clinical effective use. Also, additional large clinical trials are recommended for clarifying the effect of Black cohosh.
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Affiliation(s)
- Sofia Salari
- Department of Clinical Pharmacy, School of Pharmacy, Mashhad University of Medical Sciences, Mashhad, Iran
| | | | - Mahin Ramezani
- Nanotechnology Research Center, Mashhad University of Medical Sciences, Mashhad, Iran.,Pharmaceutical Research Center, Mashhad University of Medical Sciences, Mashhad, Iran
| | - Ali Tafazoli Moghadam
- School of Pharmacy, Mashhad University of Medical Sciences, Mashhad, Iran.,Department of Clinical Pharmacy, School of Pharmacy, Shahid Beheshti University of Medical Sciences, Tehran, Iran
| | - Sepideh Elyasi
- Department of Clinical Pharmacy, School of Pharmacy, Mashhad University of Medical Sciences, Mashhad, Iran.
| | - Amirhossein Sahebkar
- Applied Biomedical Research Center, Mashhad University of Medical Sciences, Mashhad, Iran. .,Biotechnology Research Center, Pharmaceutical Technology Institute, Mashhad University of Medical Sciences, Mashhad, Iran. .,School of Pharmacy, Mashhad University of Medical Sciences, Mashhad, Iran. .,Polish Mother's Memorial Hospital Research Institute (PMMHRI), Lodz, Poland.
| | - Seyed Ahmad Emami
- Department of Traditional Pharmacy, School of Pharmacy, Mashhad University of Medical Sciences, Mashhad, Iran.
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6
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Nunes V, Mendez‐Sanchez N. Impact of Herbal and Dietary Supplements Causing Drug-Induced Liver Injury in Latin America. Clin Liver Dis (Hoboken) 2020; 16:83-86. [PMID: 33005386 PMCID: PMC7508779 DOI: 10.1002/cld.905] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/13/2019] [Accepted: 11/26/2019] [Indexed: 02/04/2023] Open
Abstract
Watch a video presentation of this article.
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Affiliation(s)
- Vinicius Nunes
- Hospital Universitario Prof. Edgard SantosSalvador de BahiaBrazil
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7
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Kuraoka-Oliveira ÂM, Radai JAS, Leitão MM, Lima Cardoso CA, Silva-Filho SE, Leite Kassuya CA. Anti-inflammatory and anti-arthritic activity in extract from the leaves of Eriobotrya japonica. JOURNAL OF ETHNOPHARMACOLOGY 2020; 249:112418. [PMID: 31770567 DOI: 10.1016/j.jep.2019.112418] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/23/2019] [Revised: 11/14/2019] [Accepted: 11/18/2019] [Indexed: 06/10/2023]
Abstract
ETHNOPHARMACOLOGICAL RELEVANCE The Eriobotrya japonica (EJ) is a Chinese medicinal plant that is currently grown in Brazil. E. japonica leaves infusion is traditionally used in the treatment of inflammation; however, there are few scientific studies showing the effects of these properties on joint articular and persistent experimental inflammation. AIM OF THE STUDY The present research had objective investigation of the effect of infusion obtained from leaves of E. japonica (EJLE) on acute and persistent experimental articular inflammation. MATERIALS AND METHODS The Swiss mice were treated orally with EJLE and analyzed for acute pleural inflammation (30, 100, and 300 mg/kg), paw edema induced by carrageenan (100 mg/kg), acute knee inflammation induced by zymosan (100 mg/kg), and persistent inflammation induced by Complete Freund's Adjuvant (CFA) (30 and 100 mg/kg). Mechanical hyperalgesia, cold and edema were analyzed. RESULTS The chromatographic analysis of EJLE revealed the presence of corosolic acid, oleanolic acid, and ursolic acid. EJLE presented anti-inflammatory activity in the pleurisy model, inhibiting leukocyte migration, protein extravasation and nitric oxide production. In the articular inflammation model, EJLE reduced the number of leukocytes in the joint cavity, paw edema and hyperalgesia (4 h after induction). In the persistent inflammation model induced by CFA, the extract reduced paw edema after 11 days of mechanical and cold hyperalgesia on day 6. CONCLUSIONS The EJLE has anti-inflammatory and antihyperalgesic potential in models of acute and persistent experimental articular inflammation, making this infusion a new possibility for complementary treating acute or chronic articular inflammatory diseases.
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Affiliation(s)
- Ângela Midori Kuraoka-Oliveira
- School of Health Sciences, Federal University of Grande Dourados (UFGD), Dourados, MS, Brazil; School of Health Sciences, University Center of Grande Dourados (UNIGRAN), Dourados, MS, Brazil.
| | | | - Maicon Matos Leitão
- School of Health Sciences, Federal University of Grande Dourados (UFGD), Dourados, MS, Brazil; School of Health Sciences, University Center of Grande Dourados (UNIGRAN), Dourados, MS, Brazil.
| | - Claudia Andrea Lima Cardoso
- Center of Studies on Natural Resource, Mato Grosso do Sul State University (UEMS) - Dourados, Dourados, MS, Brazil.
| | - Saulo Euclides Silva-Filho
- School of Pharmaceutical Sciences, Food and Nutrition, Federal University of Mato Grosso do Sul (UFMS), Campo Grande, MS, Brazil.
| | - Cândida Aparecida Leite Kassuya
- School of Health Sciences, Federal University of Grande Dourados (UFGD), Dourados, MS, Brazil; University Hospital (HU-UFGD), Federal University of Grande Dourados (UFGD), Dourados, MS, Brazil.
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Xiao X, Tang J, Mao Y, Li X, Wang J, Liu C, Sun K, Ye Y, Zou Z, Peng C, Yang L, Guo Y, Bai Z, He T, Jing J, Li F, An N. Guidance for the clinical evaluation of traditional Chinese medicine-induced liver injuryIssued by China Food and Drug Administration. Acta Pharm Sin B 2019; 9:648-658. [PMID: 31193760 PMCID: PMC6543019 DOI: 10.1016/j.apsb.2018.12.003] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022] Open
Affiliation(s)
- Xiaohe Xiao
- China Military Institute of Chinese Medicine, Beijing 302 Hospital of China, Beijing 100039, China
| | - Jianyuan Tang
- Center for Drug Evaluation, China Food and Drug Administration, Beijing 100022, China
| | - Yimin Mao
- Renji Hospital of Shanghai Jiaotong University, Shanghai 200127, China
| | - Xiuhui Li
- Beijing Youan Hospital of Capital Medical University, Beijing 100069, China
| | - Jiabo Wang
- China Military Institute of Chinese Medicine, Beijing 302 Hospital of China, Beijing 100039, China
| | - Chenghai Liu
- Shuguang Hospital of Shanghai University of Traditional Chinese Medicine, Shanghai 200127, China
| | - Kewei Sun
- First Affiliated Hospital of Hunan University of Traditional Chinese Medicine, Changsha 410007, China
| | - Yong'an Ye
- Dongzhimen Hospital of Beijing University of Traditional Chinese Medicine, Beijing 100700, China
| | - Zhengsheng Zou
- Center for Non-infectious Liver Diseases, Beijing 302 Hospital of China, Beijing 100039, China
| | - Cheng Peng
- College of Pharmacy, Chengdu University of Traditional Chinese Medicine, Chengdu 610075, China
| | - Ling Yang
- College of Pharmacy, Shanghai University of Traditional Chinese Medicine, Shanghai 201203, China
| | - Yuming Guo
- China Military Institute of Chinese Medicine, Beijing 302 Hospital of China, Beijing 100039, China
| | - Zhaofang Bai
- China Military Institute of Chinese Medicine, Beijing 302 Hospital of China, Beijing 100039, China
| | - Tingting He
- China Military Institute of Chinese Medicine, Beijing 302 Hospital of China, Beijing 100039, China
| | - Jing Jing
- China Military Institute of Chinese Medicine, Beijing 302 Hospital of China, Beijing 100039, China
| | - Fengyi Li
- Center for Infectious Liver Diseases, Beijing 302 Hospital of China, Beijing 100039, China
| | - Na An
- Center for Drug Evaluation, China Food and Drug Administration, Beijing 100022, China
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Mishra OP, Popov AV, Pietrofesa RA, Nakamaru-Ogiso E, Andrake M, Christofidou-Solomidou M. Synthetic secoisolariciresinol diglucoside (LGM2605) inhibits myeloperoxidase activity in inflammatory cells. Biochim Biophys Acta Gen Subj 2018; 1862:1364-1375. [PMID: 29524540 PMCID: PMC5970065 DOI: 10.1016/j.bbagen.2018.03.003] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/31/2017] [Revised: 03/02/2018] [Accepted: 03/05/2018] [Indexed: 12/16/2022]
Abstract
BACKGROUND Myeloperoxidase (MPO) generates hypochlorous acid (HOCl) during inflammation and infection. We showed that secoisolariciresinol diglucoside (SDG) scavenges radiation-induced HOCl in physiological solutions. However, the action of SDG and its synthetic version, LGM2605, on MPO-catalyzed generation of HOCl is unknown. The present study evaluated the effect of LGM2605 on human MPO, and murine MPO from macrophages and neutrophils. METHODS MPO activity was determined fluorometrically using hypochlorite-specific 3'-(p-aminophenyl) fluorescein (APF). The effect of LGM2605 on (a) the peroxidase cycle of MPO was determined using Amplex Red while the effect on (b) the chlorination cycle was determined using a taurine chloramine assay. Using electron paramagnetic resonance (EPR) spectroscopy we determined the effect of LGM2605 on the EPR signals of MPO. Finally, computational docking of SDG was used to identify energetically favorable docking poses to enzyme's active site. RESULTS LGM2605 inhibited human and murine MPO activity. MPO inhibition was observed in the absence and presence of Cl-. EPR confirmed that LGM2605 suppressed the formation of Compound I, an oxoiron (IV) intermediate [Fe(IV)O] containing a porphyrin π-radical of MPO's catalytic cycle. Computational docking revealed that SDG can act as an inhibitor by binding to the enzyme's active site. CONCLUSIONS We conclude that LGM2605 inhibits MPO activity by suppressing both the peroxidase and chlorination cycles. EPR analysis demonstrated that LGM2605 inhibits MPO by decreasing the formation of the highly oxidative Compound I. This study identifies a novel mechanism of LGM2605 action as an inhibitor of MPO and indicates that LGM2605 may be a promising attenuator of oxidant-dependent inflammatory tissue damage.
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Affiliation(s)
- Om P Mishra
- Division of Pulmonary, Allergy and Critical Care, Department of Medicine, University of Pennsylvania Perelman School of Medicine, Philadelphia, PA 19104, United States.
| | - Anatoliy V Popov
- Department of Radiology, University of Pennsylvania Perelman School of Medicine, Philadelphia, PA 19104, United States.
| | - Ralph A Pietrofesa
- Division of Pulmonary, Allergy and Critical Care, Department of Medicine, University of Pennsylvania Perelman School of Medicine, Philadelphia, PA 19104, United States.
| | - Eiko Nakamaru-Ogiso
- Department of Biochemistry and Biophysics, University of Pennsylvania Perelman School of Medicine, Philadelphia, PA 19104, United States.
| | - Mark Andrake
- Molecular Modeling Facility, Fox Chase Cancer Center, Philadelphia, PA 19111, United States.
| | - Melpo Christofidou-Solomidou
- Division of Pulmonary, Allergy and Critical Care, Department of Medicine, University of Pennsylvania Perelman School of Medicine, Philadelphia, PA 19104, United States.
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