title: Electro-acupuncture at Acupoint ST36 Ameliorates Inflammation and Regulates Th1/Th2 Balance in Delayed-Type Hypersensitivity.
abstract: Increasing evidence indicates anti-allergic and anti-inflammatory effects of electro-acupuncture (EA) therapy. However, its underlying mechanism on delayed-type hypersensitivity (DTH), a classic allergic inflammatory disease, still remains unclear. In this study, we aimed to explore the immunomodulatory mechanism of EA intervention in a mouse model of ovalbumin (OVA)-induced DTH. Mice were randomly divided into four groups: Control, OVA-DTH, DTH + EA, DTH + Sham. "Zusanli" acupoint (ST36) was used for DTH + EA, whereas a non-acupoint (localized 5 mm below the "Zusanli" acupoint) was selected for DTH + Sham. Footpad thickness was checked, and the infiltration of inflammatory cells was estimated by hematoxylin and eosin staining. Levels of IgG and IgE in serum of different groups and inflammatory cytokines in the supernatants from homogenized footpads, including IFN-γ, TNF-α, IL-4, and IL-5, were determined by ELISA. Cell proliferation of spleen lymphocytes was assayed by 3-(4,5-dimethyl-2-thiazolyl)-2,5-diphenyl-2-H-tetrazolium bromide (MTT). The frequency of CD4+IFN-γ+and CD4+IL-4+T cells was analyzed with flow cytometry. In addition, the mRNA and protein expression of T-bet and GATA-3 were evaluated by real-time PCR and Western blotting, respectively. Our data showed EA treatment at acupoint ST36 relieved the pathological progression of DTH responses via reduction in footpad swelling, infiltration of inflammatory cells, levels of IgG and IgE as well as decreased production of IFN-γ and TNF-α in homogenized footpad tissue. Moreover, detailed studies were performed revealing that EA attenuated the percentage of CD4+IFN-γ+T cells and prevented Th cells differentiation into Th1 cells, and this results from inhibiting secretion of IFN-γ and suppressing expression of T-bet, an IFN-γ transcription factor. The results indicated that EA treatment improved Th1-mediated allergic skin inflammation via restoring Th1/Th2 balance by curbing Th1 differentiation. These findings suggested that EA at acupoint ST36 might be a useful and promising therapeutic for allergic inflammatory as well as Th1-mediated inflammation response.
authors.affiliation: Department of Pathogen Biology, College of Basic Medicine, Hubei University of Chinese Medicine, Wuhan, 430065, China.
authors.forename: Zhigang
authors.initials: Z
authors.lastname: Wang
authors.affiliation: Department of Anatomy, College of Basic Medicine, Hubei University of Chinese Medicine, 1 Huangjiahu West Road, Hongshan District, Wuhan, 430065, China.
authors.forename: Tao
authors.initials: T
authors.lastname: Chen
authors.affiliation: College of Basic Medicine, Hubei University of Chinese Medicine, Wuhan, 430065, China.
authors.forename: Man
authors.initials: M
authors.lastname: Long
authors.affiliation: Department of Biochemistry, College of Basic Medicine, Hubei University of Chinese Medicine, Wuhan, 430065, China.
authors.forename: Longyun
authors.initials: L
authors.lastname: Chen
authors.affiliation: School of Laboratory Medicine, Hubei University of Chinese Medicine, Wuhan, 430065, China.
authors.forename: Lei
authors.initials: L
authors.lastname: Wang
authors.affiliation: Department of Anatomy, College of Basic Medicine, Hubei University of Chinese Medicine, 1 Huangjiahu West Road, Hongshan District, Wuhan, 430065, China. yinnina-hbtcm@hotmail.com.|Hubei Provincial Collaborative Innovation Center of Preventive Treatment by Acupuncture and Moxibustion, Hubei University of Chinese Medicine, 1 Huangjiahu West Road, Hongshan District, Wuhan, 430065, China. yinnina-hbtcm@hotmail.com.
authors.forename: Nina
authors.initials: N
authors.lastname: Yin
authors.affiliation: Hubei Provincial Collaborative Innovation Center of Preventive Treatment by Acupuncture and Moxibustion, Hubei University of Chinese Medicine, 1 Huangjiahu West Road, Hongshan District, Wuhan, 430065, China. chenzebin-hbtcm@outlook.com.
authors.forename: Zebin
authors.initials: Z
authors.lastname: Chen
mesh_terms: D026881:Acupuncture / Q000379:methods*; D015669:Acupuncture Points; D000818:Animals; D002454:Cell Differentiation; D002465:Cell Movement; D049109:Cell Proliferation; D006968:Hypersensitivity, Delayed / Q000628:therapy*; D007073:Immunoglobulin E / Q000032:analysis; D007074:Immunoglobulin G / Q000032:analysis; D007249:Inflammation / Q000473:pathology / Q000628:therapy*; D051379:Mice; D010047:Ovalbumin; D058408:Th1-Th2 Balance
chemical_list: D007074:Immunoglobulin G; D007073:Immunoglobulin E; D010047:Ovalbumin
keywords: Th1/Th2; Zusanli; delayed-type hypersensitivity; electro-acupuncture; inflammation