Related Experiment Videos
Analysis of gene expression profile in p130(Cas)-deficient fibroblasts
Tetsuya Nakamoto1, Takahiro Suzuki, Jinhong Huang
1Department of Hematology and Oncology, Graduate School of Medicine, University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8655, Japan.
Abstract:
p130(Cas) (Cas) is a docking protein that becomes tyrosine phosphorylated in v-Src- or v-Crk-transformed cells and in integrin-stimulated cells. Cas -/- fibroblasts show defects in stress fiber formation, cell spreading, cell migration, and transformation by activated Src. To further characterize the role of Cas in signaling, we compared the expression profile in Cas -/- fibroblasts with that in Cas-re-expressing fibroblasts using the microarray methods. In Cas -/- fibroblasts, the expression of heme oxygenase 1 and caveolin-1 was reduced, but the expression of procollagen 1 alpha 1, procollagen 3 alpha 1, procollagen 11 alpha 1, elastin, periostin, TSC-36, and MARCKS was enhanced. The domains in Cas necessary for the change varied among these genes. Activated Src reduced the expression of most of these genes both in Cas -/- and in Cas +/+ fibroblasts. These results suggest the existence of signaling pathways that emanate from Cas to gene expression.
Insights
p130(Cas) is a crucial docking protein involved in cell signaling. Its absence in fibroblasts alters gene expression, impacting cell functions and response to Src activation, suggesting Cas-dependent signaling pathways.
Area of Science:
- Cell Biology
- Molecular Biology
- Biochemistry
Background:
- p130(Cas) is a docking protein phosphorylated during cell signaling.
- Cas-deficient fibroblasts exhibit impaired stress fiber formation, cell spreading, migration, and Src-mediated transformation.
- Understanding Cas's role in gene expression is critical for deciphering cellular signaling networks.
Purpose of the Study:
- To investigate the impact of p130(Cas) on gene expression profiles.
- To compare gene expression in Cas-deficient fibroblasts with Cas-reconstituted cells.
- To elucidate Cas-dependent signaling pathways influencing gene regulation.
Main Methods:
- Microarray analysis was employed to compare gene expression profiles.
- Cas-deficient (Cas -/-) and Cas-re-expressing fibroblasts were utilized.
- Analysis involved examining gene expression changes in response to activated Src.
Main Results:
- Cas deficiency led to reduced expression of heme oxygenase 1 and caveolin-1.
- Enhanced expression of procollagen types, elastin, periostin, TSC-36, and MARCKS was observed in Cas -/- fibroblasts.
- Activated Src modulated the expression of these genes in both Cas-deficient and wild-type cells.
Conclusions:
- p130(Cas) plays a significant role in regulating the expression of specific genes involved in extracellular matrix and cellular structure.
- Distinct domains of Cas are implicated in mediating these gene expression changes.
- These findings support the existence of Cas-initiated signaling pathways that directly influence gene expression.