Radiotherapy for lymphoma, gynecologic cancers, and sarcomas of the upper abdomen may result in radiation-induced kidney injury. Moreover, it is possible that radiation nephropathy could occur after a nuclear accident. Radiation nephropathy usually progresses very slowly, over a period of several years. The precise pathogenesis and/or mediators involved in radiation nephropathy remain under active investigation. It has been indicated that ionizing radiation induces senescence, which is one of the hallmarks of aging. As the senescent cell fraction following irradiation is known to increase, we investigated whether ionizing radiation causes the renal injury by inducing cellular senescence. In the present study, we evaluated the effects of ionizing radiation on canine renal epithelial cells (MDCK), which predominantly used in in vitro renal cell models. We found that the exposure of ionizing radiation on MDCK cells induced cellular senescence. Notably, cleaved form of Klotho, a renal neuraminidase that is essential for the function of fibroblast growth factor 23, was significantly increased following irradiation in culture media of MDCK cells. Lectin affinity analysis determined that these secreted klotho reduced the sialylated form of epithelial calcium channel (TRPV5), in MDCK cells. Furthermore, Klotho expression was decreased in renal tissues of radiation-exposed mice. Collectively, our data suggest that increase of secreted klotho and their neuraminidase activity to TRPV5 following irradiation may contribute to the development of renal dysfunction through the acceleration of cellular senescence.
저자
Jeong-In Park [ Radiation Non-Clinical center, Division of Basic Radiation Bioscience, Korea Institute of Radiological and Medical Sciences, 75 Nowon-Ro, Nowon-Gu, Seoul, 01812, Korea ]
Eun Ju Kim [ Radiation Non-Clinical center, Division of Basic Radiation Bioscience, Korea Institute of Radiological and Medical Sciences, 75 Nowon-Ro, Nowon-Gu, Seoul, 01812, Korea ]
Minyoung Lee [ Radiation Non-Clinical center, Division of Basic Radiation Bioscience, Korea Institute of Radiological and Medical Sciences, 75 Nowon-Ro, Nowon-Gu, Seoul, 01812, Korea ]
본 학회는 화학, 생화학, 분자생물학, 미생물학, 식품공학, 의학, 약학, 유전공학 및 생물공학, 환경 및 기타 공업 등 전 분야의 탄수화물관련 이론과 기술을 연구 발전시키고 산학협동을 통해 이를 보급하여 국내 관련 산업의 발전 및 국민생활의 과학화에 기여하고자 하며, 이러한 목표와 비젼의 실현을 위해 회원들이 적극적인 참여와 활동을 전개하고자 한다.