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Lee S, Jung GT, Cho M, Lee JW, Eghan K, Lee J, Yoon S, Kim KP, Kim WK. Plausibility of Daphnia magna as an alternative experimental model to evaluate effects on eicosanoid synthesis. ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY 2023; 262:115119. [PMID: 37327520 DOI: 10.1016/j.ecoenv.2023.115119] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/23/2022] [Revised: 06/05/2023] [Accepted: 06/06/2023] [Indexed: 06/18/2023]
Abstract
Eicosanoids play important roles in inflammation, allergy, fever, and immune responses. In the eicosanoid pathway, cyclooxygenase (COX) catalyzes the conversion of arachidonic acid to prostaglandins and is a crucial target of nonsteroidal anti-inflammatory drugs (NSAIDs). Thus, toxicological studies on the eicosanoid pathway are important for drug discovery and the evaluation of adverse health outcomes due to environmental contaminants. However, experimental models are limited owing to concerns regarding ethical standards. Thus, new alternative models for evaluating toxic effects on the eicosanoid pathway must be developed. To this end, we adopted an invertebrate species, Daphnia magna, as an alternative model. D. magna was exposed to ibuprofen, a major NSAID, for 6 and 24 h. Transcription of eicosanoid-related genes (pla2, cox, pgd synthase, pgd2r2, ltb4dh, and lox) was analyzed by qPCR, eicosanoids (arachidonic acid, prostaglandin F2, dihydroxy prostaglandin F2, and 5-hydroxyeicosatetraenoate) were quantified by multiple reaction monitoring, and enzyme-linked immunosorbent assay was used to determine protein levels of arachidonic acid and prostaglandin E2 (PGE2). After 6 h of exposure, transcription of the pla2 and cox genes was downregulated. In addition, the whole-body level of arachidonic acid, an upstream of COX pathway, increased by over 1.5-fold. The levels of PGE2, a downstream of COX pathway, decreased after 24 h of exposure. According to our results, it is expected that the eicosanoid pathway might be conserved in D. magna, at least partially. This indicates the plausibility of D. magna as an alternative model for the screening of new drugs or chemical toxicity.
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Affiliation(s)
- Sangwoo Lee
- Department of Predictive Toxicology, Korea Institute of Toxicology, Daejeon 34114, the Republic of Korea
| | - Gun Tae Jung
- Department of Biomedical Science and Technology, Kyung Hee Medical Science Research Institute, Kyung Hee University, Seoul 02453, the Republic of Korea
| | - Mina Cho
- Department of Predictive Toxicology, Korea Institute of Toxicology, Daejeon 34114, the Republic of Korea
| | - Jae Won Lee
- Department of Applied Chemistry, Institute of Natural Science, Global Center for Pharmaceutical Ingredient Materials, Kyung Hee University, Yongin 17104, the Republic of Korea
| | - Kojo Eghan
- Department of Predictive Toxicology, Korea Institute of Toxicology, Daejeon 34114, the Republic of Korea; Human and Environmental Toxicology, University of Science and Technology, Daejeon 34113, the Republic of Korea
| | - Jieon Lee
- Department of Predictive Toxicology, Korea Institute of Toxicology, Daejeon 34114, the Republic of Korea
| | - Seokjoo Yoon
- Department of Predictive Toxicology, Korea Institute of Toxicology, Daejeon 34114, the Republic of Korea; Human and Environmental Toxicology, University of Science and Technology, Daejeon 34113, the Republic of Korea
| | - Kwang Pyo Kim
- Department of Biomedical Science and Technology, Kyung Hee Medical Science Research Institute, Kyung Hee University, Seoul 02453, the Republic of Korea; Department of Applied Chemistry, Institute of Natural Science, Global Center for Pharmaceutical Ingredient Materials, Kyung Hee University, Yongin 17104, the Republic of Korea.
| | - Woo-Keun Kim
- Department of Predictive Toxicology, Korea Institute of Toxicology, Daejeon 34114, the Republic of Korea; Human and Environmental Toxicology, University of Science and Technology, Daejeon 34113, the Republic of Korea.
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Shin JW, Lee ER, Noh H, Kwak J, Gal JY, Park HJ, Kim S, Song HK, Seo K, Han BS. Novel Herbal Therapeutic YH23537 Improves Clinical Parameters in Ligature-Induced Periodontal Disease Model in Beagle Dogs. Int J Dent 2023; 2023:8130287. [PMID: 37159594 PMCID: PMC10163972 DOI: 10.1155/2023/8130287] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/28/2022] [Revised: 03/21/2023] [Accepted: 03/27/2023] [Indexed: 05/11/2023] Open
Abstract
Currently, available medicine does not satisfy the clinical unmet needs of periodontal disease. Therefore, novel drugs with improved efficacy profiles are needed. We previously demonstrated that YH14642, water extracts of Notoginseng Radix and Rehmanniae Radix Preparata, improved probing depths in double-blind phase II clinical trial. However, it still has hurdles for commercialization due to the low efficiency of active compound extraction. To resolve this issue, we developed YH23537 through process optimization to extract active compounds efficiently while still achieving the chemical profile of YH14642. In this study, we investigated the therapeutic effects of YH23537 compared with YH14642 using a canine model of ligature-induced periodontitis. Human gingival fibroblast (hGF) cells were treated with various concentrations of YH23537 or YH14642 with lipopolysaccharide (LPS) for 24 hr. IL-6 and IL-8 levels in the conditioned media were determined using Luminex. Sixteen 3-year-old male beagle dogs had their teeth scaled and polished using a piezo-type ultrasonic scaler under general anesthesia and brushed once daily for the following 2 weeks. Two weeks after the scaling procedure, the left upper second premolar (PM2), third premolar (PM3), and fourth premolar (PM4) as well as the left lower PM3, PM4, and first molar (M1) were ligated with silk-wire twisted ligatures. The dogs were fed with soft moistened food to induce periodontitis for 8 weeks, and the ligatures were then removed. YH23537 and YH14642 were administered for 4 weeks, and clinical periodontal parameters such as plaque index (PI), gingival index (GI), probing depth (PD), clinical attachment level (CAL), and bleeding on probing (BoP) were determined before and 1, 2, 3, and 4 weeks after treatment. YH23537 inhibited IL-6 and IL-8 secretion in a dose-dependent manner in hGF cells stimulated with LPS. The IC50 values for YH23537 were 43 and 54 μg/ml for IL-6 and IL-8, respectively, while the values for YH14642 were 104 and 117 μg/ml, respectively. In the animal study, clinical parameters including GI, PD, CAL, and BoP were significantly increased after 8 weeks of ligature-induced periodontitis. The YH23537 300 and YH23537 900 mg groups had significant improvements in CAL from 1 to 4 weeks after treatment in comparison to the placebo group. GR values in the YH23537 900 mg group were decreased throughout the treatment period. GI values were also reduced significantly after 4-week treatment with 300 and 900 mg of YH23537. YH23537 at 300 mg doses showed comparable efficacy for CAL and GR with 1,000 mg of YH14642. YH23537 showed therapeutic efficacy against periodontitis in dogs, mediated by anti-inflammatory effects. These findings indicate that YH23537 has the potential for further development as a new drug for patients suffering from periodontal disease.
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Affiliation(s)
- Jang-Woo Shin
- Yuhan R&D Institute, 25 Tapsil-ro, 35 Beon-gil, Giheung-gu, Yongin-si 446-902, Gyeonggi-do, Republic of Korea
| | - Eui-Ri Lee
- Department of Veterinary Clinical Science, College of Veterinary Medicine, Seoul National University, 1 Gwanak-ro, Gwanak-gu, Seoul 151-742, Republic of Korea
| | - Hyunwoo Noh
- Department of Veterinary Clinical Science, College of Veterinary Medicine, Seoul National University, 1 Gwanak-ro, Gwanak-gu, Seoul 151-742, Republic of Korea
| | - Jiyoon Kwak
- Department of Veterinary Clinical Science, College of Veterinary Medicine, Seoul National University, 1 Gwanak-ro, Gwanak-gu, Seoul 151-742, Republic of Korea
| | - Ji-Yeong Gal
- Yuhan R&D Institute, 25 Tapsil-ro, 35 Beon-gil, Giheung-gu, Yongin-si 446-902, Gyeonggi-do, Republic of Korea
| | - Hyun-Je Park
- Yuhan Natural Product R&D Center, Yuhan Care Co., Ltd., 25 Tapsil-ro, 35 Beon-gil, Giheung-gu, Yongin-si, Gyeonggi-do, Republic of Korea
| | - Seongkyu Kim
- Yuhan R&D Institute, 25 Tapsil-ro, 35 Beon-gil, Giheung-gu, Yongin-si 446-902, Gyeonggi-do, Republic of Korea
| | - Hyun-Kyung Song
- Department of Bio Applied Toxicology, Toxicology Research Center, Hoseo University, 20 Hoseo-ro, 79 Beon-gil, Baebang-eup, Asan-si, Chungcheongnam–do, Republic of Korea
| | - Kangmoon Seo
- Department of Veterinary Clinical Science, College of Veterinary Medicine, Seoul National University, 1 Gwanak-ro, Gwanak-gu, Seoul 151-742, Republic of Korea
| | - Beom Seok Han
- Department of Bio Applied Toxicology, Toxicology Research Center, Hoseo University, 20 Hoseo-ro, 79 Beon-gil, Baebang-eup, Asan-si, Chungcheongnam–do, Republic of Korea
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Zhu Y, Wang A, Zhang S, Kim J, Xia J, Zhang F, Wang D, Wang Q, Wang J. Paclitaxel-loaded ginsenoside Rg3 liposomes for drug-resistant cancer therapy by dual targeting of the tumor microenvironment and cancer cells. J Adv Res 2022:S2090-1232(22)00209-0. [PMID: 36167294 DOI: 10.1016/j.jare.2022.09.007] [Citation(s) in RCA: 14] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/26/2022] [Revised: 09/16/2022] [Accepted: 09/19/2022] [Indexed: 12/16/2022] Open
Abstract
INTRODUCTION Inherent or acquired resistance to paclitaxel (PTX) is a pivotal challenge for chemotherapy treatment of multidrug-resistant (MDR) breast cancer. Although various targeted drug-delivery systems, including nanoparticles and liposomes, are effective for MDR cancer treatment, their efficacy is restricted by immunosuppressive tumor microenvironment (TME). METHODS Ginsenosides Rg3 was used to formulate unique Rg3-based liposomes loaded with PTX to establish Rg3-PTX-LPs, which were prepared by the thin-film hydration method. The stability of the Rg3-PTX-LPs was evaluated by particle size analysis through dynamic light scattering. The active targeting effect of Rg3-based liposomes was examined in an MCF-7/T xenograft model by an in a vivo imaging system. To evaluate the antitumor activity and mechanism of Rg3-PTX-LP, MTT, apoptosis assays, TAM regulation, and TME remodeling were performed in MCF-7/T cells in vitro and in vivo. RESULTS Rg3-PTX-LPs could specifically distribute to MCF7/T cancer cells and TME simultaneously, mainly through the recognition of GLUT-1. The drug resistance reversing capability and in vivo antitumor effect of Rg3-PTX-LPs were significantly improved compared with conventional cholesterol liposomes. The TME remodeling mechanisms of Rg3-PTX-LPs included inhibiting IL-6/STAT3/p-STAT3 pathway activation to repolarize protumor M2 macrophages to antitumor M1 phenotype, suppressing myeloid-derived suppressor cells (MDSCs), decreasing tumor-associated fibroblasts (TAFs) and collagen fibers in TME, and promoting apoptosis of tumor cells. Hence, through the dual effects of targeting tumor cells and TME remodeling, Rg3-PTX-LPs achieved a high tumor inhibition rate of 90.3%. CONCLUSION Our multifunctional Rg3-based liposome developed in the present study offered a promising strategy for rescuing the drug resistance tumor treatment.
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Affiliation(s)
- Ying Zhu
- Department of Pharmaceutics, School of Pharmacy, Fudan University & Key Laboratory of Smart Drug Delivery, Ministry of Education, Shanghai 201203, PR China; Department of Integrative Oncology, Fudan University Shanghai Cancer Center, Shanghai 200032, China
| | - Anni Wang
- Department of Pharmaceutics, School of Pharmacy, Fudan University & Key Laboratory of Smart Drug Delivery, Ministry of Education, Shanghai 201203, PR China
| | - Shuya Zhang
- Department of Pharmaceutics, School of Pharmacy, Fudan University & Key Laboratory of Smart Drug Delivery, Ministry of Education, Shanghai 201203, PR China
| | - Jisu Kim
- Department of Pharmaceutics, School of Pharmacy, Fudan University & Key Laboratory of Smart Drug Delivery, Ministry of Education, Shanghai 201203, PR China
| | - Jiaxuan Xia
- Department of Pharmaceutics, School of Pharmacy, Fudan University & Key Laboratory of Smart Drug Delivery, Ministry of Education, Shanghai 201203, PR China
| | - Fengxue Zhang
- Science and Technology Innovation Center, Guangzhou University of Chinese Medicine, Guangzhou 510405, China
| | - Dan Wang
- Xiamen Ginposome Pharmaceutical Co., Ltd., Xiamen 361026, People's Republic of China
| | - Qi Wang
- Science and Technology Innovation Center, Guangzhou University of Chinese Medicine, Guangzhou 510405, China; Institute of Clinical Pharmacology, Guangzhou University of Chinese Medicine, Guangzhou 510405, China.
| | - Jianxin Wang
- Department of Pharmaceutics, School of Pharmacy, Fudan University & Key Laboratory of Smart Drug Delivery, Ministry of Education, Shanghai 201203, PR China; Institute of Integrated Chinese and Western Medicine, Fudan University, Shanghai 200040, China; Science and Technology Innovation Center, Guangzhou University of Chinese Medicine, Guangzhou 510405, China.
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Wang J, Zeng L, Zhang Y, Qi W, Wang Z, Tian L, Zhao D, Wu Q, Li X, Wang T. Pharmacological properties, molecular mechanisms and therapeutic potential of ginsenoside Rg3 as an antioxidant and anti-inflammatory agent. Front Pharmacol 2022; 13:975784. [PMID: 36133804 PMCID: PMC9483152 DOI: 10.3389/fphar.2022.975784] [Citation(s) in RCA: 16] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/22/2022] [Accepted: 07/14/2022] [Indexed: 12/06/2022] Open
Abstract
Inflammation and oxidative stress lead to various acute or chronic diseases, including pneumonia, liver and kidney injury, cardiovascular and cerebrovascular diseases, metabolic diseases, and cancer. Ginseng is a well-known and widely used ethnic medicine in Asian countries, and ginsenoside Rg3 is a saponin isolated from Panax ginseng C. A. Meyer, Panax notoginseng, or Panax quinquefolius L. This compound has a wide range of pharmacological properties, including antioxidant and anti-inflammatory activities, which have been evaluated in disease models of inflammation and oxidative stress. Rg3 can attenuate lung inflammation, prevent liver and kidney function damage, mitigate neuroinflammation, prevent cerebral and myocardial ischemia–reperfusion injury, and improve hypertension and diabetes symptoms. The multitarget, multipathway mechanisms of action of Rg3 have been gradually deciphered. This review summarizes the existing knowledge on the anti-inflammatory and antioxidant effects and underlying molecular mechanisms of ginsenoside Rg3, suggesting that ginsenoside Rg3 may be a promising candidate drug for the treatment of diseases with inflammatory and oxidative stress conditions.
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Affiliation(s)
- Jing Wang
- Department of Respiratory, The Affiliated Hospital to Changchun University of Chinese Medicine, Changchun, China
- State Key Laboratory of Quality Research in Chinese Medicines, Faculty of Chinese Medicine, Macau University of Science and Technology, Macau, China
| | - Li Zeng
- State Key Laboratory of Quality Research in Chinese Medicines, Faculty of Chinese Medicine, Macau University of Science and Technology, Macau, China
| | - Ying Zhang
- Department of Respiratory, The Affiliated Hospital to Changchun University of Chinese Medicine, Changchun, China
| | - Wenxiu Qi
- Jilin Ginseng Academy, Changchun University of Chinese Medicine, Changchun, China
| | - Ziyuan Wang
- Department of Respiratory, The Affiliated Hospital to Changchun University of Chinese Medicine, Changchun, China
| | - Lin Tian
- Department of Respiratory, The Affiliated Hospital to Changchun University of Chinese Medicine, Changchun, China
| | - Daqing Zhao
- Jilin Ginseng Academy, Changchun University of Chinese Medicine, Changchun, China
| | - Qibiao Wu
- State Key Laboratory of Quality Research in Chinese Medicines, Faculty of Chinese Medicine, Macau University of Science and Technology, Macau, China
- Guangdong-Hong Kong-Macao Joint Laboratory for Contaminants Exposure and Health, Guangzhou, China
- *Correspondence: Qibiao Wu, ; Xiangyan Li, ; Tan Wang,
| | - Xiangyan Li
- Jilin Ginseng Academy, Changchun University of Chinese Medicine, Changchun, China
- *Correspondence: Qibiao Wu, ; Xiangyan Li, ; Tan Wang,
| | - Tan Wang
- Department of Respiratory, The Affiliated Hospital to Changchun University of Chinese Medicine, Changchun, China
- *Correspondence: Qibiao Wu, ; Xiangyan Li, ; Tan Wang,
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Synergistic Effects of Korean Red Ginseng Extract and the Conventional Systemic Therapeutics of Atopic Dermatitis in a Murine Model. Nutrients 2021; 14:nu14010133. [PMID: 35011005 PMCID: PMC8746861 DOI: 10.3390/nu14010133] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/08/2021] [Revised: 12/23/2021] [Accepted: 12/24/2021] [Indexed: 12/12/2022] Open
Abstract
The synergistic effects of Korean Red ginseng (KRG, Panax ginseng C.A. Mey.) on conventional systemic therapeutics of atopic dermatitis (AD) have not been studied yet. To analyze the synergistic effects of KRG extract and the conventional systemic therapeutics of AD in TNCB-induced AD mouse model, we determined the change in modified scoring of index, the transepidermal water loss, the skin pathology, serum IgE, and the expression of various cytokines after combination treatment to the five-week-old NC/Nga female mice. The severity of AD was significantly decreased in the KRG + hydroxyzine (AH) group than AH group, and in the KRG + evening primrose oil (EPO) group than EPO group. A significant decrease in dermal inflammation was observed in the KRG + AH group than that in the AH group, and in the KRG + EPO group than that in the EPO group (p = 0.008), respectively. A decrease in CD1a expression was observed in the KRG + AH group when compared to the AH group (p = 0.008), and KRG + EPO group when compared to the EPO group. Compared to the CS group, the KRG + CS group showed a significant decrease in IL-17 expression. A combination of KRG and conventional systemic therapeutics can safely and effectively manage the AD.
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Zhu Y, Liang J, Gao C, Wang A, Xia J, Hong C, Zhong Z, Zuo Z, Kim J, Ren H, Li S, Wang Q, Zhang F, Wang J. Multifunctional ginsenoside Rg3-based liposomes for glioma targeting therapy. J Control Release 2021; 330:641-657. [DOI: 10.1016/j.jconrel.2020.12.036] [Citation(s) in RCA: 30] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/03/2020] [Revised: 12/12/2020] [Accepted: 12/20/2020] [Indexed: 12/12/2022]
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Fan J, Liu S, Ai Z, Chen Y, Wang Y, Li Y, Li X, Xiao S, Wang Y. Fermented ginseng attenuates lipopolysaccharide-induced inflammatory responses by activating the TLR4/MAPK signaling pathway and remediating gut barrier. Food Funct 2021; 12:852-861. [PMID: 33404578 DOI: 10.1039/d0fo02404j] [Citation(s) in RCA: 13] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
Abstract
Generally, ginsenosides have the physiological effect of an anti-inflammatory immunity. After fermentation, the types of ginsenosides in ginseng change, and their physiological activity becomes a concern. L. plantarum KP-4 screened from Korean kimchi were used to ferment ginseng, and the changes of ginsenosides were observed. C57BL/6N mice were treated using fermented ginseng (390 mg kg-1 day-1), which was mixed with normal food, and an inflammatory mice model was established by the intraperitoneal injection of lipopolysaccharide (LPS) (2.5 mg per kg body weight) four weeks later. The liver index, pathological index, biochemical index, and inflammatory signaling pathway were determined. The results demonstrated that L. plantarum KP-4 fermentation increased the content of minor ginsenosides in ginseng and decreased the content of major ginsenosides. Fermented ginseng significantly reduced LPS-induced increases in ALT, AST, and pro-inflammatory cytokines IL-6, TNF-α, and IL-1β in mice. Supplementation with fermented ginseng significantly ameliorated LPS-induced overexpression of Toll-like receptor 4 (TLR4), caspase3, phosphorylation p38 mitogen-activated protein kinase (p38MAPK), and phosphorylation extracellular signal-regulated kinase (ERK) compared with the control group. Moreover, fermented ginseng significantly increased the expression of claudin 1, the intestinal tight junction protein, caused by LPS. In conclusion, fermented ginseng alleviates LPS-induced inflammation through the TLR4/MAPK signaling pathway and increased intestinal barrier function in mice.
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Affiliation(s)
- Jingjing Fan
- College of Food Science and Engineering, Jilin Agricultural University, Changchun, China
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Im DS. Pro-Resolving Effect of Ginsenosides as an Anti-Inflammatory Mechanism of Panax ginseng. Biomolecules 2020; 10:biom10030444. [PMID: 32183094 PMCID: PMC7175368 DOI: 10.3390/biom10030444] [Citation(s) in RCA: 96] [Impact Index Per Article: 24.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/25/2020] [Revised: 03/09/2020] [Accepted: 03/11/2020] [Indexed: 12/22/2022] Open
Abstract
Panax ginseng, also known as Korean ginseng, is a famous medicinal plant used for the treatment of many inflammatory diseases. Ginsenosides (ginseng saponins) are the main class of active constituents of ginseng. The anti-inflammatory effects of ginseng extracts were proven with purified ginsenosides, such as ginsenosides Rb1, Rg1, Rg3, and Rh2, as well as compound K. The negative regulation of pro-inflammatory cytokine expressions (TNF-α, IL-1β, and IL-6) and enzyme expressions (iNOS and COX-2) was found as the anti-inflammatory mechanism of ginsenosides in M1-polarized macrophages and microglia. Recently, another action mechanism emerged explaining the anti-inflammatory effect of ginseng. This is a pro-resolution of inflammation derived by M2-polarized macrophages. Direct and indirect evidence supports how several ginsenosides (ginsenoside Rg3, Rb1, and Rg1) induce the M2 polarization of macrophages and microglia, and how these M2-polarized cells contribute to the suppression of inflammation progression and promotion of inflammation resolution. In this review, the new action mechanism of ginseng anti-inflammation is summarized.
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Affiliation(s)
- Dong-Soon Im
- Laboratory of Pharmacology, College of Pharmacy, Kyung Hee University, 26 Kyungheedae-ro, Dongdaemun-gu, Seoul 02447, Korea; ; Tel.: +82-2-961-9377; Fax: +82-2-961-9580
- Department of Life and Nanopharmaceutical Sciences, Graduate School, Kyung Hee University, 26 Kyungheedae-ro, Dongdaemun-gu, Seoul 02447, Korea
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Endogenous Neurosteroid (3α,5α)3-Hydroxypregnan-20-one Inhibits Toll-like-4 Receptor Activation and Pro-inflammatory Signaling in Macrophages and Brain. Sci Rep 2019; 9:1220. [PMID: 30718548 PMCID: PMC6362084 DOI: 10.1038/s41598-018-37409-6] [Citation(s) in RCA: 64] [Impact Index Per Article: 12.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/04/2018] [Accepted: 10/05/2018] [Indexed: 12/31/2022] Open
Abstract
The endogenous neurosteroid (3α,5α)3-hydroxypregnan-20-one (3α,5α-THP, allopregnanolone) has protective activity in animal models of alcoholism, depression, traumatic brain injury, schizophrenia, multiple sclerosis, and Alzheimer’s disease that is poorly understood. Because these conditions involve proinflammatory signaling through toll-like receptors (TLRs), we examined the effects of 3α,5α-THP, and pregnenolone on TLR4 activation in both the periphery and the central nervous system (CNS). We used monocytes/macrophages (RAW264.7) as a model of peripheral immune signaling and studied innately activated TLR4 in the ventral tegmental area (VTA) of selectively bred alcohol-preferring (P) rats. LPS activated the TLR4 pathway in RAW264.7 cells as evidenced by increased levels of p-TAK1, TRAF6, NF-κB p50, phospho-NF-κB- p65, pCREB, HMGB1, and inflammatory mediators, including MCP-1 and TNFα. Both 3α,5α-THP and pregnenolone (0.5–1.0μM) substantially (~80%) inhibited these effects, indicating pronounced inhibition of TLR4 signaling. The mechanism of inhibition appears to involve blockade of TLR4/MD-2 protein interactions in RAW246.7 cells. In VTA, 3α,5α-THP (15 mg/kg, IP) administration reduced TRAF6 (~20%), CRF (~30%), and MCP-1 (~20%) levels, as well as TLR4 binding to GABAA receptor α2 subunits (~60%) and MyD88 (~40%). The data suggest that inhibition of proinflammatory neuroimmune signaling underlies protective effects of 3α,5α-THP in immune cells and brain, apparently involving blocking of protein-protein interactions that initiate TLR4-dependent signaling. Inhibition of pro-inflammatory TLR4 activation represents a new mechanism of 3α,5α-THP action in the periphery and the brain.
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