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      • Profiling of immunotoxicity in mice exposed to polyethylene microplastics through intragastric intubation for 4 weeks

        Yong Heo,JiHun Jo,Ravi Gautam,Manju Acharya,Pramod KC,Anju Maharjan,DaEun Lee,ChangYul Kim,HyoungAh Kim,GyoungWoo Lee,HyeJin Kang,JunHo Sin,YeongEun Yu,SeungYi Seo 한국실험동물학회 2021 한국실험동물학회 학술발표대회 논문집 Vol.2021 No.7

        Microplastics (MPs) have been recently recognized as a global environmental threat and its exposure as a risk factor to human health. Health effects through MPs exposure have been recently reported, whereas not much evaluation on immunotoxicity of MP has been reported. The present study was designed to evaluate whether polyethylene MPs (PE-MPs) subacute exposure through intragastric intubation could be immunotoxic to ICR mice. PEs with 5 or 50 μm diameter were administered to 6 wk old female and male mice at 0 (distilled water, vehicle control), 500 (low), and 1000 (middle), or 2000 (high) mg/day for 4 wks. No influence of the exposure on thymic T lymphocyte development was observed due to no difference in thymic lymphocyte subpopulation through flow cytometer analysis among the groups. Proportions of splenic CD4(+) and B lymphocyte were higher without statistical significances in the exposure groups than the vehicle control regardless of dose and gender. Serum IgG2a:IgG1 ratio was dose-dependently elevated in the male and female 5 μm PE exposure group, which pattern was not observed with 50 μm exposure group. Furthermore, ratios of IFN-gamma:IL-4, a parameter for predicting balance between type-1 and type-2 immune reactivity in helper T lymphocytes stimulated ex vivo with phytohemagglutinin for 48h, were higher in the male 5 μm PE exposure group than the control, but not observed in the female 5 μm and the 50 μm exposure group of both genders. Overall, the present study indicates that exposure to PE-MPs could alter immune homeostasis, especially to smaller size of MPs. Investigation on size-dependent and plastic type-related immune modulation should be advanced. [supported by the Korea Environmental Industry & Technology Institute (No.2020003120002) and the Ministry of Environment-Educational training program for the management of information on the hazards and risk of chemical substances]

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