Programmed cell death 4 (PDCD4) is a novel tumor suppressor that function in the nucleus and the cytoplasm and appears to be involved in the regulation of transcription and translation. Stress granules (SGs) are cytoplasmic foci at which untranslated mRNAs accumulate when cells exposed to environmental stresses. Since PDCD4 has implicated in translation repression through direct interaction with eukaryotic translation initiation factor 4A (eIF4A), we here investigated if PDCD4 has a functional role in the process of SG assembly under oxidative stresses. Using immunofluorescence microscopy, we found that PDCD4 is localized to SGs under oxidative stresses. Next, we tested if knockdown of PDCD4 has an effect on the assembly of SG using PDCD4-specific siRNA. Interestingly, SG assembly was accelerated and this effect was caused by sensitization of phosphorylation of eIF2 and dephosphorylation of eIF4E binding protein (4E-BP). These results suggest that PDCD4 has an effect on SG dynamics and possibly involved in capdependent translation repression under stress conditions.
목차
Abstract 1. Introduction 2. Materials and Methods 2.1 Cell Culture, Transfection and Western Blot Analysis 2.2 Reagents and Antibodies 2.3 RNA Interference 2.4 Immunocytochemistry 3. Results & Discussion 4. Conclusion Acknowledgement References
키워드
Programmed Cell Death 4Stress GranuleOxidative StressTranslation
저자
Jeeho Kim [ Department of Cellular & Molecular Medicine, College of Medicine, Chosun University, Laboratory of Genomic Instability and Cancer Therapeutics, Cancer Mutation Research Center, College of Medicine, Chosun University ]
In Youb Chang [ Department of Anatomy, College of Medicine, Chosun University, Gwangju 61452 Republic of Korea ]
Wooje Lee [ Department of Cellular & Molecular Medicine, College of Medicine, Chosun University, Laboratory of Genomic Instability and Cancer Therapeutics, Cancer Mutation Research Center, College of Medicine, Chosun University ]
Takbum Ohn [ Department of Cellular & Molecular Medicine, College of Medicine, Chosun University, Laboratory of Genomic Instability and Cancer Therapeutics, Cancer Mutation Research Center, College of Medicine, Chosun University ]
Corresponding author
조선대학교 기초과학연구원 [The Natural Science Research Institute of Chosun]
설립연도
2008
분야
자연과학>자연과학일반
소개
본 연구원은 기초과학을 진흥하기 위한 연구·교육 및 그 보급을 목적으로 한다. 이 목적을 달성하기 위하여 다음 각 호의 사업을 수행한다.
1. 기초과학 제 분야에 관한 조사와 연구
2. 기초과학에 관한 학술행사(학술대회, 학술세미나, 심포지엄, 초청강연회 등) 개최
3. 학문후속세대 및 일반인을 위한 기초과학 교육
4. 기관지『조선자연과학논문지』 발간
5. 『자연과학연구총서』, 『자연과학번역총서』 등 단행본 발간
6. 기타 본 연구원의 목적과 관련된 사업
간행물
간행물명
통합자연과학논문집(구 조선자연과학논문집) [Journal of Integrative Natural Science]