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Updated: Jun 22, 2026
In Vitro Establishment of a Genetically Engineered Murine Head and Neck Cancer Cell Line using an Adeno-Associated Virus-Cas9 System
Published on: January 9, 2020
Promoted cell proliferation by connexin 30 gene transfection to head-and-neck cancer cell line
Hiroyuki Ozawa1, Hideki Mutai, Tatsuo Matsunaga
1National Institute of Sensory Organs, National Tokyo Medical Center, Meguro-ku, Tokyo 152-8902, Japan. ozakky@cb.mbn.or.jp
Background:
There have been inconsistent results regarding the contribution of the connexin family of genes to tumor cell proliferation.
Materials And Methods:
We aimed to clarify the role of connexin 30 (Cx30), by transfecting three kinds of vectors that express either full length Cx30 (Cx30-Full), Cx30 devoid of C-terminal region (Cx30-DelC) or Cx30 C-terminal region (Cx30-CT), in HSC-4, a head-and-neck cancer cell line.
Results:
Transfected Cx30-Full was localized on the plasma membrane, while Cx30-DelC and Cx30-CT was expressed in the cytoplasm or circumnuclear sites. We studied the effect on the growth rate followed by immunostaining with anti-Ki-67 (MIB-1). The MIB indices of HSC-4 cells transfected with Cx30-Full and Cx30-DelC, but not Cx30-CT were shown to be significantly higher than that of the controls.
Conclusion:
Our results demonstrated that Cx30 enhanced the proliferation of HSC-4 cells and the proliferating activity was considered to be achieved without the transport of the protein onto the plasma membrane.
Insights
Connexin 30 (Cx30) enhances head and neck cancer cell proliferation. This effect occurs even when Cx30 is not transported to the plasma membrane, suggesting novel mechanisms in tumor growth.
Area of Science:
- Molecular Biology
- Cancer Research
- Cell Biology
Background:
- Inconsistent findings exist regarding connexin gene family's role in tumor cell proliferation.
- Connexins are gap junction proteins involved in cell communication and regulation.
Purpose of the Study:
- To investigate the specific role of connexin 30 (Cx30) in head and neck cancer cell proliferation.
- To determine if Cx30's localization (plasma membrane vs. cytoplasm) affects its proliferative influence.
Main Methods:
- HSC-4 head and neck cancer cells were transfected with vectors expressing full-length Cx30, Cx30 lacking the C-terminal region, or only the C-terminal region.
- Cell proliferation was assessed using Ki-67 (MIB-1) immunostaining and MIB indices were calculated.
Main Results:
- Full-length Cx30 localized to the plasma membrane; truncated forms (Cx30-DelC, Cx30-CT) localized to the cytoplasm.
- HSC-4 cells transfected with Cx30-Full and Cx30-DelC showed significantly increased proliferation compared to controls.
- Cx30-CT transfection did not significantly alter proliferation rates.
Conclusions:
- Connexin 30 (Cx30) significantly enhances the proliferation of HSC-4 head and neck cancer cells.
- Cx30-mediated proliferation can occur independently of its translocation to the plasma membrane, suggesting non-canonical functions.
