Effect of KAI1/CD82 on the beta1 integrin maturation in highly migratory carcinoma cells.

Abstract

The KAI1/CD82 protein has been documented as the tumor metastasis suppressor in many types of human cancers. KAI1/CD82 regulates cell motility and invasiveness; however, the mechanism by which this occurs remains to be fully established. Several studies have shown that KAI1/CD82 modulates integrin-dependent signaling. It was suggested that KAI1/CD82 might function to attenuate the beta1 integrin function of inducing cellular migration. A wound-healing and modified Boyden chamber assays were performed to investigate the mechanism of the KAI1/CD82-mediated inhibition of cell migration. It was found that the migratory ability of H1299/CD82 was inhibited. The immunoblotting and biotinylation assays revealed that H1299/CD82 showed significantly decreased expression of the mature form of beta1, which was functional at the cell surface. It was confirmed that KAI1/CD82 regulates the maturation of the beta1 integrin using CD82-specific si-RNA. These results support a model in which KAI1/CD82 attenuates the maturation of the beta1 integrin precursor and thereby suppresses cell migration.

• Authors: Bo Keun Jee, Joo Yong Lee, Young Lim, Kweon Haeng Lee, Yang-Hyeok Jo
• Journal: Biochemical and biophysical research communications (Biochem Biophys Res Commun) Vol. 359 Issue 3 Pg. 703-8 (Aug 03 2007) ISSN: 0006-291X [Print] United States
• PMID: 17560548 (Publication Type: Journal Article, Research Support, Non-U.S. Gov't)

Chemical References

• Integrin beta1
• Kangai-1 Protein
• RNA, Small Interfering

Topics

• Animals
• Cell Line
• Cell Membrane (metabolism)
• Cell Movement
• Gene Expression Regulation, Neoplastic
• Glycosylation
• Humans
• Integrin beta1 (metabolism)
• Kangai-1 Protein (genetics, metabolism)
• Lung Neoplasms (genetics, metabolism, pathology)
• Mice
• Protein Processing, Post-Translational
• RNA, Small Interfering (genetics)