Song Yi Kim, Ji Sun Hwang, Seon Young Park, Inn Oc Han
언어
영어(ENG)
URL
https://www.earticle.net/Article/A192937
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원문정보
초록
영어
Tunicamyin (TM) blocks the synthesis of all N-linked glycoproteins and causes ER stress. It has been reported that TM inhibits LPS-induced NF-kB activation via suppression of MD-2 N-glycosylations. In this study, we investigated that the inhibitory effect of tunicamycin (TM) on lipopolysaccharide (LPS)-induced inflammation is independent of N-linked glycosylations of MD-2 in RAW264.7 macrophage. TM significantly suppressed nitiric oxide (NO) production, inducible nitric oxide synthase (iNOS), Cyclooxygenase-2 (COX-2), and pro-inflammatory cytokines, interleukin 1 beta (IL-1β) and tumor necrosis factor alpa (TNF-α) expression in response to LPS. TM also inhibited the inflammatory reactions in response to other TLR ligands, Polyinosinic:polycytidylic acid (Poly:IC) or Lipoteichoic acid (LTA), which do not require N-glycosylated MD-2 protein for macrophage activation. This indicates that the anti-inflammatory effect of TM may not associated with MD-2 N-linked glycosylations. Other well-known ER stress inducers, A23187 (A23) and thapsigargin (TG) had no effect on LPS-induced inflammation, suggesting that ER stress induction and UPR pathway is not necessarily stimulatory factors for LPS-induced inflammation. We showed that TM inhibited LPS-induced nuclear translocation of p50 and DNA binding of p50 and p65 to NF-κB binding sequence of iNOS promoter. Therefore we conclude that TM repressed LPS-induced inflammation through suppression of NF-kB binding activity and independent of inhibition of N-linked glycosylations of MD-2.
저자
Song Yi Kim [ Department of Physiology and Biophysics, College of Medicine, Inha University, Incheon, 402-751, Korea ]
Ji Sun Hwang [ Department of Physiology and Biophysics, College of Medicine, Inha University, Incheon, 402-751, Korea ]
Seon Young Park [ Department of Physiology and Biophysics, College of Medicine, Inha University, Incheon, 402-751, Korea ]
Inn Oc Han [ Department of Physiology and Biophysics, College of Medicine, Inha University, Incheon, 402-751, 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.