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Altered gap junctional intercellular communication in neoplastic rat esophageal epithelial cells
S A Garber1, M J Fernstrom, G D Stoner
1Department of Pathology, Medical College of Ohio, Toledo, OH 43699, USA.
Carcinogenesis
|June 1, 1997
Summary
Gap junctional intercellular communication (GJIC) is reduced in esophageal neoplasms. Studies show connexin43 (Cx43) is present in normal and cancerous esophageal cells, but heterologous GJIC is limited.
Area of Science:
- Cell Biology
- Cancer Research
- Gastroenterology
Background:
- Gap junctional intercellular communication (GJIC) is crucial for tissue homeostasis.
- Reduced GJIC is observed in various cancers, but data for esophageal neoplasms are scarce.
- Connexin43 (Cx43) is a key protein forming gap junctions.
Purpose of the Study:
- To investigate GJIC in rat esophageal epithelial cells, focusing on connexin expression and function in neoplastic versus non-neoplastic contexts.
- To determine the role of Cx43 in esophageal cell communication during normal and cancerous states.
Main Methods:
- Utilized fluorescent dye microinjection to assess GJIC in homologous and heterologous cell co-cultures.
- Employed Northern, Western, and immunohistochemical analyses to evaluate connexin expression (Cx43, Cx32, Cx26).
- Examined Cx43 distribution in normal, preneoplastic, and neoplastic rat esophageal tissues via immunostaining.
Main Results:
- All tested esophageal cell lines exhibited robust homologous GJIC.
- Significant heterologous GJIC was observed in only one of six co-culture combinations.
- Cx43 was expressed in all cell lines and tissues, forming gap junction plaques, with altered distribution in neoplastic lesions.
Conclusions:
- Esophageal cells express Cx43 and maintain extensive homologous GJIC.
- Limited heterologous GJIC between non-neoplastic and neoplastic cells may contribute to esophageal cancer development.
- Altered Cx43 distribution in preneoplastic and neoplastic lesions suggests a role in disease progression.