Effects of seasonal changes on T-helper 1/T-helper 2 immune balance and eczema onset in rats  

作　　者：Hairong Zhang Leilei Liu Yike Sun Wenna Li Ruochong Wang Xiao Sun Guangqin Zhu Shuran Ma 

机构地区：[1]School of Traditional Chinese Medicine,Beijing University of Chinese Medicine,Beijing 102488,China [2]Department of Acupuncture and Minimally Invasive Oncology,Beijing University of Chinese Medicine Third Affiliated Hospital,Beijing 100029,China

出　　处：《Journal of Traditional Chinese Medical Sciences》2023年第1期64-72,共9页中医科学杂志（英文）

基　　金：funded by the Fundamental Research Funds for the Central Universities(2020-JYB-ZDGG-016).

摘　　要：Objective: To explore the impact of seasonal changes on the T-helper 1(Th1)/T-helper 2(Th2) immune balance of the body in order to elucidate the internal immunological mechanisms underlying seasonal eczema.Methods: Eighty 4-week-old male Sprague-Dawley rats were divided into 5 season groups kept in corresponding season simulation environments, and subdivided into the model group and the control group. The Eczema Area and Severity Index(EASI) and scratching frequency were evaluated. The serum levels of immunoglobulin E(IgE), interleukin-2(IL-2), interleukin-12(IL-12), and interferon-gamma(IFN-γ), interleukin-4(IL-4), interleukin-25(IL-25), and interleukin-31(IL-31), and melatonin(MT), as well as the MT receptor(MTR) levels in the spleen, were detected by enzyme-linked immunosorbent assay analysis. The mRNA expression levels of T-bet and GATA3 were detected by quantitative real-time polymerase chain reaction.Results: EASI scores and the scratching frequency of the model group were higher in the long summer than in the other 4 seasons. Meanwhile, the serum levels of IgE and the Th2 cytokines IL-4, IL-25, and IL-31, as well as GATA3 mRNA expression levels, were high during the long summer in both groups. However, the serum levels of the Th1 cytokines IL-2, IL-12, and IFN-γ, as well as MT, MTR, and T-bet mRNA levels, were lower during the long summer. In all 5 seasonal groups(spring, summer, long summer, autumn, and winter), the levels of all immune factors, especially IL-4 and IL-31, were higher in the model group than those in the control group,while the concentrations of MT and MTR were lower.Conclusion: Under long light, hot, and humid conditions in the long summer, the body is more likely to suffer from Th2-dominated immune imbalance. This is the internal mechanism behind the high incidence and severity of eczema during the long summer. MT and MTR play a key role in the seasonal onset of eczema.

关 键 词：ECZEMA SEASONALITY Long summer IMMUNIZATION Th1/Th2 MELATONIN Immunoglobulin E 

分 类 号：R285.5[医药卫生—中药学]