Rap1 is a key regulator of cell adhesion and migration. Although increasing evidence indicates that the Rap1 signaling pathway is involved in the process of bone remodeling, the mechanism by which Rap1 regulates osteoblastic differentiation and cell adhesion remains unknown. Here, we investigated the morphological characteristics and osteoblastic differentiation of cells expressing constitutively activated form of Rap1A (Rap1ACA) or Rap1 GTPase activating protein Rap1GAP and found that activated Rap1 induces osteoblastic differentiation and cell adhesion as well as cell spreading. When osteoblastic differentiation was induced, Rap1ACA cells showed considerably higher levels of calcium deposits than the wild-type and Rap1GAP-overexpressing cells did. Rap1ACA cells showed increased spreading and size, as well as strong cell adhesion and significantly decreased growth rates. F-actin staining using phalloidin revealed several thin thread-like filopodia around the protrusions in Rap1ACA cells, which possibly contribute to the increased cell adhesion.
목차
Abstract 1. Introduction 2. Materials and Methods 2.1. Materials and Plasmids 2.2. Cell Culture and Stable Cell Lines 2.3. Osteogenic Induction 2.4. Cell Adhesion Assay 2.5. Cell Growth Rate Assay 2.6. Immunofluorescence 2.7. Alizarin Red S Staining 2.8. Statistical Analysis 3. Results and Discussion 3.1. Activated Rap1A Induces Osteoblastic Differentiation in Preosteoblasts 3.2. Activated Rap1A Stimulates Spreading of Preosteoblasts 3.3. Activated Rap1A Promotes Formation of Filopodia and Increases Cell Adhesion 4. Conclusion References
키워드
Rap1AfilopodiaGTPase
저자
Hyeseon Kim [ Department of Life Science & BK21-Plus Research Team for Bioactive Control Technology, College of Natural Sciences, Chosun University, Gwangju 61452, Korea ]
Taeck J. Jeon [ College of Natural Sciences Room 3105, Chosun University, Gwangju 61452, Republic of Korea ]
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]