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Role of blocked gap junctional intercellular communication in non-genotoxic carcinogenesis
M Mesnil1, V Krutovskikh, Y Omori
1Unit of Multistage Carcinogenesis, International Agency for Research on Cancer, Lyon, France.
Abstract:
Gap junctional intercellular communication mediates the transfer of small molecules from the cytoplasm of one cell to that of neighbouring cells. Connexins are the proteins that form the channels responsible for this type of communication. Aberrant expression and function of connexins are often found in cells exposed to tumor-promoting agents and during carcinogenesis, both in cell culture systems and in tissues freshly removed directly from patients and exposed animals. Transfection of connexin genes into tumorigenic cells often exerts negative growth control, suggesting that connexins act as a family of tumor-suppressor genes. Connexin gene mutations appear to be the cause of two human diseases, i.e. X-linked Charcot-Marie-Tooth syndrome and visceroatrial heterotaxia. Connexin genes are therefore important for the maintenance of homeostasis and thus their dysfunction could lead to various forms of disease.
Insights
Connexins, proteins forming cell communication channels, are crucial for maintaining homeostasis. Their dysfunction is linked to cancer and genetic diseases, highlighting their tumor-suppressor role.
Area of Science:
- Cell biology
- Molecular genetics
- Human physiology
Background:
- Gap junctional intercellular communication (GJIC) facilitates intercellular transfer of small molecules.
- Connexins are the protein constituents of gap junction channels.
- Aberrant connexin expression and function are implicated in carcinogenesis and tumor promotion.
Purpose of the Study:
- To investigate the role of connexins in cellular communication and disease.
- To explore the potential of connexins as tumor suppressors.
- To understand the link between connexin gene mutations and human diseases.
Main Methods:
- Analysis of connexin expression in cancer models and patient tissues.
- Gene transfection studies in tumorigenic cell lines.
- Examination of connexin gene mutations in inherited human disorders.
Main Results:
- Connexin gene transfection into tumorigenic cells demonstrated negative growth control.
- Connexin dysfunction is associated with tumor promotion and carcinogenesis.
- Connexin gene mutations are causative for X-linked Charcot-Marie-Tooth syndrome and visceroatrial heterotaxia.
Conclusions:
- Connexins function as a family of tumor-suppressor genes.
- Connexin genes are vital for maintaining cellular homeostasis.
- Connexin dysfunction contributes to the pathogenesis of various diseases.