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Ikeura T, Tomiyama T, Takaori A, Ito T, Nakamaru K, Masuda M, Hori Y, Tsukuda S, Sumimoto K, Mitsuyama T, Nakayama S, Shimatani M, Uchida K, Takaoka M, Okazaki K, Naganuma M. Long-term Outcomes after Steroid Pulse Therapy in Patients with Type 1 Autoimmune Pancreatitis. Intern Med 2023; 62:2931-2940. [PMID: 36889699 PMCID: PMC10641208 DOI: 10.2169/internalmedicine.0807-22] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/09/2022] [Accepted: 01/26/2023] [Indexed: 03/09/2023] Open
Abstract
Objective Steroid pulse therapy is a regimen involving the intravenous administration of supra-pharmacological doses of corticosteroids in the short term. It is used to treat various inflammatory and autoimmune conditions. However, the strengths and limitations of steroid pulse therapy for induction of remission in type 1 autoimmune pancreatitis (AIP) are unknown. Methods Depending on the steroid therapy regimen administered, the 104 patients with type 1 AIP included in this retrospective study were divided into three groups: conventional oral prednisolone (PSL) regimen (PSL group), intravenous methylprednisolone (IVMP) pulse followed by oral PSL regimen (Pulse+PSL group), and IVMP pulse-alone regimen (Pulse-alone group). We then examined the relapse rate and adverse events among the three groups. Results The Kaplan-Meier estimates of the relapse rate at 36 months after steroid therapy were 13.6% in the PSL group, 13.3% in the Pulse+PSL group, and 46.2% in the Pulse-alone group. The log-rank test revealed that the relapse-free survival in the Pulse-alone group was significantly shorter than that in the PSL (p=0.024) and Pulse+PSL groups (p=0.014). The exacerbation of glucose tolerance after steroid therapy was less frequently observed in the Pulse-alone group (0%) than in the PSL group (17%, p=0.050) and Pulse+PSL groups (26%, p=0.011). Conclusion Although treatment with IVMP pulse alone resulted in unsatisfactory relapse prevention outcomes compared with conventional steroid therapy, the IVMP pulse-alone regimen might be an alternative treatment strategy for type 1 AIP from the perspective of avoiding adverse events from steroids.
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Affiliation(s)
- Tsukasa Ikeura
- Third Department of Internal Medicine, Kansai Medical University, Japan
| | - Takashi Tomiyama
- Third Department of Internal Medicine, Kansai Medical University, Japan
| | - Ayaka Takaori
- Third Department of Internal Medicine, Kansai Medical University, Japan
| | - Takashi Ito
- Third Department of Internal Medicine, Kansai Medical University, Japan
| | - Koh Nakamaru
- Third Department of Internal Medicine, Kansai Medical University, Japan
| | - Masataka Masuda
- Third Department of Internal Medicine, Kansai Medical University, Japan
| | - Yuichi Hori
- Kansai Medical University Kori Hospital, Japan
| | | | - Kimi Sumimoto
- Division of Gastroenterology and Hepatology, Kansai Medical University Medical Center, Japan
| | - Toshiyuki Mitsuyama
- Division of Gastroenterology and Hepatology, Kansai Medical University Medical Center, Japan
| | - Shinji Nakayama
- Third Department of Internal Medicine, Kansai Medical University, Japan
| | - Masaaki Shimatani
- Division of Gastroenterology and Hepatology, Kansai Medical University Medical Center, Japan
| | - Kazushige Uchida
- Department of Gastroenterology and Hepatology, Kochi Medical School, Kochi University, Japan
| | | | | | - Makoto Naganuma
- Third Department of Internal Medicine, Kansai Medical University, Japan
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2
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Sharma D, Joshi M, Apparsundaram S, Goyal RK, Patel B, Dhobi M. Solanum nigrum L. in COVID-19 and post-COVID complications: a propitious candidate. Mol Cell Biochem 2023; 478:2221-2240. [PMID: 36689040 PMCID: PMC9868520 DOI: 10.1007/s11010-022-04654-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/22/2022] [Accepted: 12/30/2022] [Indexed: 01/24/2023]
Abstract
COVID-19 is caused by severe acute respiratory syndrome coronavirus-2, SARS-CoV-2. COVID-19 has changed the world scenario and caused mortality around the globe. Patients who recovered from COVID-19 have shown neurological, psychological, renal, cardiovascular, pulmonary, and hematological complications. In some patients, complications lasted more than 6 months. However, significantly less attention has been given to post-COVID complications. Currently available drugs are used to tackle the complications, but new interventions must address the problem. Phytochemicals from natural sources have been evaluated in recent times to cure or alleviate COVID-19 symptoms. An edible plant, Solanum nigrum, could be therapeutic in treating COVID-19 as the AYUSH ministry of India prescribes it during the pandemic. S. nigrum demonstrates anti-inflammatory, immunomodulatory, and antiviral action to treat the SARS-CoV-2 infection and its post-complications. Different parts of the plant represent a reduction in proinflammatory cytokines and prevent multi-organ failure by protecting various organs (liver, kidney, heart, neuro, and lung). The review proposes the possible role of the plant S. nigrum in managing the symptoms of COVID-19 and its post-COVID complications based on in silico docking and pharmacological studies. Further systematic and experimental studies are required to validate our hypothesis.
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Affiliation(s)
- Divya Sharma
- Delhi Pharmaceutical Sciences and Research University, 110017, New Delhi, India
| | - Mit Joshi
- Institute of Pharmacy, Nirma University, 382481, Ahmedabad, Gujarat, India
| | - Subbu Apparsundaram
- Delhi Pharmaceutical Sciences and Research University, 110017, New Delhi, India
| | - Ramesh K Goyal
- Delhi Pharmaceutical Sciences and Research University, 110017, New Delhi, India
| | - Bhoomika Patel
- National Forensic Sciences University, Sector-9, Gandhinagar-382007, Gujarat, India.
| | - Mahaveer Dhobi
- Delhi Pharmaceutical Sciences and Research University, 110017, New Delhi, India.
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Cho KA, Kwon JY, Kim HJ, Woo SY. Age-Related Skin Inflammation in A 2,4-Dintrochlorobenzene-Induced Atopic Dermatitis Mouse Model. CELL JOURNAL 2023; 25:660-664. [PMID: 37718769 PMCID: PMC10520985 DOI: 10.22074/cellj.2023.2001403.1301] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Subscribe] [Scholar Register] [Received: 05/02/2023] [Revised: 07/01/2023] [Accepted: 08/01/2023] [Indexed: 09/19/2023]
Abstract
One of the most affected aspects of the aging process is immunity, with age-related immune system decline being responsible for an increase in susceptibility to infectious diseases and cancer risk. On the other hand, the aging process is accompanied with low-grade pro-inflammatory status. This condition involves a persistent rise in cytokine levels that can activate both innate and adaptive immune systems. Finally, despite the fact that immunological responses to antigenic stimulations decrease with age, the incidence and prevalence of many common autoimmune diseases increase in the elderly population. Overall, the co-existence of a prolonged, low-grade inflammatory status and declining immune activity appears to be a paradoxical phenomenon. This study characterized skin inflammation in mouse dermatitis model of various ages to monitor possible changes of inflammatory responses during aging.
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Affiliation(s)
- Kyung Ah Cho
- Department of Microbiology, College of Medicine, Ewha Womans University, Seoul, Republic of Korea
| | - Ji Yun Kwon
- Department of Microbiology, College of Medicine, Ewha Womans University, Seoul, Republic of Korea
| | - Hyeon Ju Kim
- Department of Microbiology, College of Medicine, Ewha Womans University, Seoul, Republic of Korea
| | - So Youn Woo
- Department of Microbiology, College of Medicine, Ewha Womans University, Seoul, Republic of Korea.
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Xia T, Liang X, Liu CS, Hu YN, Luo ZY, Tan XM. Network Pharmacology Integrated with Transcriptomics Analysis Reveals Ermiao Wan Alleviates Atopic Dermatitis via Suppressing MAPK and Activating the EGFR/AKT Signaling. Drug Des Devel Ther 2022; 16:4325-4341. [PMID: 36578822 PMCID: PMC9790806 DOI: 10.2147/dddt.s384927] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/10/2022] [Accepted: 12/08/2022] [Indexed: 12/24/2022] Open
Abstract
Background Ermiao Wan (EMW) is commonly used to treat atopic dermatitis (AD) in China. However, the pharmacological mechanisms underlying the action of EMW against AD remain unclear. Purpose We aimed to determine the mechanisms underlying the effectiveness of EMW in the treatment of AD. Methods We evaluated the effect of EMW on AD induced by dinitrochlorobenzene (DNCB) in BALB/C mice. To clarify the key components of EMW in AD treatment, the main components of EMW were identified using HPLC. Serum pharmacochemistry was used to analyze the absorbed ingredients from blood. Based on the phytochemical results, network pharmacology and molecular docking were used to predict the action of EMW. Skin transcriptomic analysis was used to validate the network pharmacology results. RT-qPCR,ELISA, and immunohistochemical were performed to validate the results of skin transcriptomics. Results EMW improved the symptoms of AD, with less rashes, less spontaneous scratching, less inflammatory cell infiltration, and fewer allergic reactions. The established HPLC method is simple and reliable. Chlorogenic acid, phellodendrine, magnoflorine, jatrorrhizine, palmatine, berberine, and atractylodin were the key effective ingredients with a high blood concentration. Fifty-seven primary causal targets of EMW against AD were identified. These targets are mainly involved in ErbB signaling pathways including EGFR, AKT1, MAPK8, JUN, MAPK1. Molecular docking showed that EGFR, AKT1, MAPK8, JUN, MAPK1 had good binding force with EMW. In AD mice, EMW regulated the EGFR/AKT signaling through upregulation of Grb2, GAB1, Raf-1, EGFR, and AKT, and downregulation of MAPK1 and JUN, compared to that in the MD group. Conclusion EMW could alleviate AD through activating EGFR/AKT signaling and suppressing MAPK. This study provides a theoretical basis for the clinical use of EMW.
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Affiliation(s)
- Ting Xia
- School of Traditional Chinese Medicine, Southern Medical University, Guangzhou, 510515, People’s Republic of China,Guangdong Provincial Key Laboratory of Chinese Medicine Pharmaceutics, Southern Medical University, Guangzhou, 510515, People’s Republic of China,Guangdong Provincial Engineering Laboratory of Chinese Medicine Preparation Technology, Guangzhou, 510515, People’s Republic of China
| | - Xiao Liang
- School of Pharmaceutical Sciences, Guilin Medical University, Guilin, 541199, People’s Republic of China
| | - Chang-Shun Liu
- School of Traditional Chinese Medicine, Southern Medical University, Guangzhou, 510515, People’s Republic of China,Guangdong Provincial Key Laboratory of Chinese Medicine Pharmaceutics, Southern Medical University, Guangzhou, 510515, People’s Republic of China,Guangdong Provincial Engineering Laboratory of Chinese Medicine Preparation Technology, Guangzhou, 510515, People’s Republic of China
| | - Yan-Nan Hu
- School of Traditional Chinese Medicine, Southern Medical University, Guangzhou, 510515, People’s Republic of China,Guangdong Provincial Key Laboratory of Chinese Medicine Pharmaceutics, Southern Medical University, Guangzhou, 510515, People’s Republic of China,Guangdong Provincial Engineering Laboratory of Chinese Medicine Preparation Technology, Guangzhou, 510515, People’s Republic of China
| | - Zhen-Ye Luo
- School of Traditional Chinese Medicine, Southern Medical University, Guangzhou, 510515, People’s Republic of China,Guangdong Provincial Key Laboratory of Chinese Medicine Pharmaceutics, Southern Medical University, Guangzhou, 510515, People’s Republic of China,Guangdong Provincial Engineering Laboratory of Chinese Medicine Preparation Technology, Guangzhou, 510515, People’s Republic of China
| | - Xiao-Mei Tan
- School of Traditional Chinese Medicine, Southern Medical University, Guangzhou, 510515, People’s Republic of China,Guangdong Provincial Key Laboratory of Chinese Medicine Pharmaceutics, Southern Medical University, Guangzhou, 510515, People’s Republic of China,Guangdong Provincial Engineering Laboratory of Chinese Medicine Preparation Technology, Guangzhou, 510515, People’s Republic of China,Correspondence: Xiao-Mei Tan, Tel/Fax + 86-020-61648265, Email
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Ma W, Ma X, Li X, Xi X, Mao C, Wang L. The Effect and Mechanism of Burnet Gels on Steroid-Dependent Dermatitis in Guinea Pig Model. BIOMED RESEARCH INTERNATIONAL 2022; 2022:5866824. [PMID: 36147631 PMCID: PMC9489357 DOI: 10.1155/2022/5866824] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 07/11/2022] [Accepted: 08/18/2022] [Indexed: 12/01/2022]
Abstract
Objective This study was designed to establish quality standards of Burnet gels and investigate the effects and mechanism of Burnet gels on steroid-dependent dermatitis (HDD) in guinea pigs. Methods HPLC was used to determine the content of gallic acid, Gentiopicrin, and paeonol. A total of 48 male guinea pigs were recruited and randomly divided into control group, model group, tacrolimus ointment group, and Burnet gel group (Low, medium, and high concentration). The HDD guinea pig model was established by the 0.5% clobetasol propionate tincture. After HDD model establishment, control group and model group smeared normal saline and the rest of the group with corresponding drugs for three weeks. The contents of IFN-γ, IL-4, and IgE in the guinea pig serum were detected by the ELISA; the protein expression levels of FLG, LOR, and Caspase-14 in the epidermis of guinea pigs were detected by the immunohistochemical and Western blotting method. Results The content of gallic acid, Gentiopicrin, and paeonol was 0.30 mg/g, 1.06 mg/g, and 0.56 mg/g. Compared with the normal group, the IFN-γ, IL-4, and IgE of guinea pig serum in the model group were significantly increased; the FLG, LOR, and Caspase-14 of guinea pig epidermis in the model group were significantly decreased; compared with the model group, the IFN-γ, IL-4, and IgE of guinea pig serum in the tacrolimus ointment group and Burnet gel group were significantly decreased; the FLG, LOR, and Caspase-14 of guinea pig epidermis in the tacrolimus ointment group and Burnet gel group were significantly increased. Conclusion Burnet gels can improve guinea pig HDD model, and the mechanism may be related to inhibiting skin inflammation and promoting the formation of epidermal skin barrier.
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Affiliation(s)
- Wenli Ma
- Ningxia Medical University, Yinchuan, Ningxia 750004, China
- Ningxia Minority Medicine Modernization Key Laboratory of Ministry of Education, Yinchuan, Ningxia 750004, China
| | - Xiaojuan Ma
- Ningxia Medical University, Yinchuan, Ningxia 750004, China
- Ningxia Minority Medicine Modernization Key Laboratory of Ministry of Education, Yinchuan, Ningxia 750004, China
| | - Xiaofan Li
- Ningxia Medical University, Yinchuan, Ningxia 750004, China
- Ningxia Minority Medicine Modernization Key Laboratory of Ministry of Education, Yinchuan, Ningxia 750004, China
| | - Xuebin Xi
- Ningxia Medical University, Yinchuan, Ningxia 750004, China
| | - Chunyang Mao
- Ningxia Medical University, Yinchuan, Ningxia 750004, China
- Ningxia Minority Medicine Modernization Key Laboratory of Ministry of Education, Yinchuan, Ningxia 750004, China
| | - Lixin Wang
- Ningxia Medical University, Yinchuan, Ningxia 750004, China
- Ningxia Minority Medicine Modernization Key Laboratory of Ministry of Education, Yinchuan, Ningxia 750004, China
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Ta-Xi-San Suppresses Atopic Dermatitis Involved in Multitarget Mechanism Using Experimental and Network Pharmacology Analysis. EVIDENCE-BASED COMPLEMENTARY AND ALTERNATIVE MEDICINE 2022; 2022:8441938. [PMID: 35646146 PMCID: PMC9132654 DOI: 10.1155/2022/8441938] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 12/21/2021] [Revised: 04/08/2022] [Accepted: 04/20/2022] [Indexed: 11/20/2022]
Abstract
Atopic dermatitis (AD) is a relapsing and chronic skin inflammation with a common incidence worldwide. Ta-Xi-San (TXS) is a Chinese herbal formula usually used for atopic dermatitis in clinic; however, its active compounds and mechanisms of action are still unclear. Our study was designed to reveal the pharmacological activities, the active compounds, and the pharmacological mechanisms of TXS for atopic dermatitis. Mice were induced by 2,4-dinitrocluorobenzene (DNCB) to build atopic dermatitis model. The pathological evaluation, enzyme-linked immunosorbent assay (ELISA), and hematoxylin and eosin (H&E) assay were performed. The UPLC-Q-Exactive-MSE and network pharmacology analysis were performed to explore active ingredients and therapeutic mechanisms of TXS. TXS treatment decreased levels of immunoglobulin E (IgE), interleukin-4 (IL-4), and tumor necrosis factor-α (TNF-α) in serum induced by DNCB. TXS reduced scratching behavior and alleviated inflammatory pathology of skin and ear. Meanwhile, TXS decreased the spleen index and increased spleen index. The UPLC-Q-Exactive-MSE results showed that 65 compounds of TXS were detected and 337 targets were fished. We collected 1371 AD disease targets, and the compound-target gene network reveled that the top 3 active ingredients were (−)-epigallocatechin gallate, apigenin, and esculetin, and the core target genes were PTGS2, PTGS1, and HSP90AA1. The KEGG pathway and GO analysis showed that TXS remedied atopic dermatitis via PI3K-Akt signaling pathway, mitogen-activated protein kinase (MAPK) signaling pathway, and Toll-like receptor (TLR) signaling pathway with the regulation of inflammatory response and transcription. Further, we found that the targets of PTGS2 and HSP90AA1 were both elevated in ears and skin of AD model mouse; however, TXS decreased the elevated expressions of PTGS2 and HSP90AA1. Our study revealed that TXS ameliorated AD based on (−)-epigallocatechin gallate, apigenin, and esculetin via targeting PTGS2 and HSP90AA1.
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Zhou X, Du HH, Long X, Pan Y, Hu J, Yu J, Zhao X. β-Nicotinamide Mononucleotide (NMN) Administrated by Intraperitoneal Injection Mediates Protection Against UVB-Induced Skin Damage in Mice. J Inflamm Res 2021; 14:5165-5182. [PMID: 34675595 PMCID: PMC8504657 DOI: 10.2147/jir.s327329] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/07/2021] [Accepted: 09/29/2021] [Indexed: 12/27/2022] Open
Abstract
Objective Ultraviolet light is an important environmental factor that induces skin oxidation, inflammation, and other diseases. Nicotinamide mononucleotide (NMN) has the effect of anti-oxidation and improving various physiological processes. This study explores the protective effect of NMN monomers given via intraperitoneal injection on UVB-induced photodamage. Methods We used a murine model of UVB-induced photodamage to evaluate the effect of an NMN monomer on photoaging skin by assessing skin and liver tissue sections, serum and skin oxidative stress levels, inflammatory markers, mRNA expression, and protein expression of skin- and liver-related genes. Results The results showed that NMN treatment blocked UVB-induced photodamage in mice, maintaining normal structure and amount of collagen fibers, normal thickness of epidermis and dermis, reducing the production of mast cells, and maintaining complete organized skin structure. NMN intraperitoneal injection also maintained the normal morphology of the mouse liver after UVB exposure. Meanwhile, NMN intraperitoneal injection was found to increase antioxidant ability and regulate the proinflammatory response of the skin and liver to UVB irradiation by enhancing the activity of antioxidant enzymes, release of anti-inflammatory cytokines, reduction of hydrogen peroxide production (H2O2), and decreased inflammatory cytokines. Furthermore, RT-qPCR results indicated that NMN reduced oxidative stress of skin and liver by promoting the activation of the AMP-activated protein kinase (AMPK) signaling pathway and further increasing the expression of downstream antioxidant genes of AMPK. RT-qPCR results also revealed that NMN treatment could downregulate the mRNA expression of interleukin (IL)-6, interleukin (IL)-1β, and tumor necrosis factor (TNF)-α, and upregulate NF-kappa-B inhibitor-α (IκB-α) and interleukin (IL)-10 by inhibiting the activation of nuclear factor-κBp65 (NFκB-p65). Finally, NMN upregulated AMPK, IκB-α, SOD1, and CAT in the skin and downregulated NF-κBp65 protein expression, which is in line with the RT-qPCR results. Conclusion Based on the above results, NMN monomer treatment with intraperitoneal injection also block the photodamage caused by UVB irradiation in mice by regulating the oxidative stress response and inflammatory response.
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Affiliation(s)
- Xianrong Zhou
- Chongqing Collaborative Innovation Center for Functional Food, Chongqing University of Education, Chongqing, People's Republic of China.,Chongqing Engineering Research Center of Functional Food, Chongqing University of Education, Chongqing, People's Republic of China.,Chongqing Engineering Laboratory for Research and Development of Functional Food, Chongqing University of Education, Chongqing, People's Republic of China.,Department of Food and Nutrition, College of Medical and Life Sciences, Silla University, Busan, South Korea
| | - Hang-Hang Du
- Department of Plastic Surgery, Chongqing Huamei Plastic Surgery Hospital, Chongqing, People's Republic of China
| | - Xingyao Long
- Chongqing Collaborative Innovation Center for Functional Food, Chongqing University of Education, Chongqing, People's Republic of China.,Chongqing Engineering Research Center of Functional Food, Chongqing University of Education, Chongqing, People's Republic of China.,Chongqing Engineering Laboratory for Research and Development of Functional Food, Chongqing University of Education, Chongqing, People's Republic of China
| | - Yanni Pan
- Chongqing Collaborative Innovation Center for Functional Food, Chongqing University of Education, Chongqing, People's Republic of China.,Chongqing Engineering Research Center of Functional Food, Chongqing University of Education, Chongqing, People's Republic of China.,Chongqing Engineering Laboratory for Research and Development of Functional Food, Chongqing University of Education, Chongqing, People's Republic of China
| | - Jian Hu
- R&D Department, Effepharm (Shanghai) Co., Ltd, Shanghai, People's Republic of China
| | - Jianjun Yu
- R&D Department, Effepharm (Shanghai) Co., Ltd, Shanghai, People's Republic of China
| | - Xin Zhao
- Chongqing Collaborative Innovation Center for Functional Food, Chongqing University of Education, Chongqing, People's Republic of China.,Chongqing Engineering Research Center of Functional Food, Chongqing University of Education, Chongqing, People's Republic of China.,Chongqing Engineering Laboratory for Research and Development of Functional Food, Chongqing University of Education, Chongqing, People's Republic of China
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Immunomodulatory and Anti-inflammatory Effects of Asiatic Acid in a DNCB-Induced Atopic Dermatitis Animal Model. Nutrients 2021; 13:nu13072448. [PMID: 34371956 PMCID: PMC8308735 DOI: 10.3390/nu13072448] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/07/2021] [Revised: 07/11/2021] [Accepted: 07/15/2021] [Indexed: 12/03/2022] Open
Abstract
We examined the immunomodulatory and anti-inflammatory effects of asiatic acid (AA) in atopic dermatitis (AD). AA treatment (5–20 µg/mL) dose-dependently suppressed the tumor necrosis factor (TNF)-α level and interleukin (IL)-6 protein expression in interferon (IFN)-γ + TNF-α-treated HaCaT cells. The 2,4-dinitrocholrlbenzene (DNCB)-induced AD animal model was developed by administering two AA concentrations (30 and 75 mg/kg/d: AD + AA-L and AD + AA-H groups, respectively) for 18 days. Interestingly, AA treatment decreased AD skin lesions formation and affected other AD characteristics, such as increased ear thickness, lymph node and spleen size, dermal and epidermal thickness, collagen deposition, and mast cell infiltration in dorsal skin. In addition, in the DNCB-induced AD animal model, AA treatment downregulated the mRNA expression level of AD-related cytokines, such as Th1- (TNF-α and IL-1β and -12) and Th2 (IL-4, -5, -6, -13, and -31)-related cytokines as well as that of cyclooxygenase-2 and CXCL9. Moreover, in the AA treatment group, the protein level of inflammatory cytokines, including COX-2, IL-6, TNF-α, and IL-8, as well as the NF-κB and MAPK signaling pathways, were decreased. Overall, our study confirmed that AA administration inhibited AD skin lesion formation via enhancing immunomodulation and inhibiting inflammation. Thus, AA can be used as palliative medication for regulating AD symptoms.
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