자궁내막세포에 노출된 프탈레이트의 독성연구
Analysis of Toxicity in Endometrial Cells Exposed Phthalate
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초록
프탈레이트(2-ethylhexyl phthalate, DEHP)는 환경오염물질 중 하나이며 플라스틱 가소제로 사용된다. 자궁내막증(endometriosis)은 병인이 잘 알려지지 않는 복잡한 질환으로estrogen 유사 작용을 하는 DEHP 노출과 연관성이 있을 것으로 추측하고 있다. 이에 본 연구는 DEHP를 Ishikawa cell에 노출시켜 Ishikawa cell에 미치는 잠재적 독성을 조사하여 자궁내막증의 병인 연관성을 알아보고자 하였다. 실험은 DEHP 농도(0, 0.01, 0.1, 1, 5 μM)를 단계적으로 처리하여 시간별(24, 48, 72 h)로 노출하였고 이에 따른 세포의 생존율, 염증 반응 그리고 ECM 분해 단백질과의 관계를 살펴본 결과 5 μM DEHP 농도에서 48, 72 h 노출하였을 때 세포 생존율와 염증성 사이토카인 TNF-α 그리고 ECM 분해 단백질 MMP-9의 발현이 시간 의존적으로 증가함을 확인하였다. 이러한 결과는 일정 농도 이상에서의 estrogen 유사 물질인 DEHP 노출이 Ishikawa cell에노출 시간에 의존하여 독성으로 작용하면서 세포 생존율 증가와 염증에 영향을 주어 자궁내막증의 병인에 잠재적인 역할을할 수 있음을 암시한다. 향후 자궁내막증의 발병 기전에 내분비교란 물질이 미치는 영향을 연구하여 자궁내막증 예방을 위한전략을 제시할 것이다.
Abstract
Di-ethylhexyl phthalate (DEHP) is an environmental contaminant that is used as a plasticizer. Endometriosis is a complex disease with an unknown etiology that is believed to be associated with exposure to DEHP. The present study examined the potential toxicity of DEHP by exposing endometrial adenocarcinoma cells (Ishikawa cells) to DEHP. In the experiments, the cells were treated with stepwise DEHP concentrations (0, 0.01, 0.1, 1, and 5 μM) for different exposure times (24, 48, and 72 h). When the relationship between the resulting survival rate of the cells and initial inflammation was examined, the cell viability, expression of TNF-α, an inflammatory mediator, and the expression of MMP-9, an ECM degradation protein, were increased remarkably when the cells were exposed to 5 μM DEHP for 48 and 72 hours. These results suggest that the exposure of Ishikawa cells to certain concentrations of DEHP, estrogen mimics, may cause time-dependent toxicity that affects the cell viability and inflammation, implying a potential role in the etiology of endometriosis. Further research on the effects of endocrine disruptors on the pathogenesis of endometriosis may reveal strategies to prevent this disease.
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