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Attempts at immortalization of crustacean primary cell cultures using human cancer genes
1School of Veterinary and Biomedical Sciences, James Cook University, Douglas, Townsville, Queensland, Australia. kerryclaydon@gmail.com
Abstract:
Primary cell cultures from crustacea have been initiated since the 1960s, yet no permanent cell line is available. Primary cells have a limited proliferative capacity in culture due to cellular senescence, which is regulated by a group of dominant senescence genes. The aim of this research was to manipulate cell cycle regulation by transfecting Cherax quadricarinatus primary cells with oncogenes, in an effort to induce a permanent cell line. Human papillomaviruses (HPV) play a critical role in the formation of anogenital cancer. Research has demonstrated that the HPV-expressed E6 and E7 proteins function concomitantly to disrupt the p53 and retinoblastoma (Rb) tumor suppressor genes, regulators of the cell-cycle checkpoints at the first gap (G(1)) phase. HPV E6 and E7 genes were transfected into the C. quadricarinatus cells by lipofection. Successful transfection was demonstrated by the presence of oncogene messenger RNA by reverse transciptase polymerase chain reaction. At day 150, transfected cells still remain viable, although cell proliferation was stagnant. It may be that while transfection of the oncogenes was successful, no proliferation of the C. quadricarinatus cells was evident due to a lack of telomere maintenance.
Insights
Researchers attempted to create a permanent crustacean cell line by transfecting Cherax quadricarinatus cells with human papillomavirus oncogenes. While transfection was successful, cell proliferation was stagnant, suggesting telomere maintenance may be a limiting factor.
Area of Science:
- Crustacean cell biology
- Molecular oncology
- Cellular senescence
Background:
- Permanent crustacean cell lines are unavailable despite decades of primary cell culture.
- Cellular senescence limits the proliferative capacity of primary cells.
- Tumor suppressor genes like p53 and retinoblastoma (Rb) regulate cell cycle checkpoints.
Purpose of the Study:
- To induce a permanent cell line from Cherax quadricarinatus primary cells.
- To manipulate cell cycle regulation using oncogenes.
- To investigate the potential of human papillomavirus (HPV) E6 and E7 genes in immortalizing crustacean cells.
Main Methods:
- Primary cells from Cherax quadricarinatus were cultured.
- Human papillomavirus (HPV) E6 and E7 oncogenes were introduced via lipofection.
- Successful transfection was confirmed by detecting oncogene messenger RNA using reverse transcriptase polymerase chain reaction.
Main Results:
- Transfection of HPV E6 and E7 genes into C. quadricarinatus cells was successful.
- Transfected cells remained viable for at least 150 days.
- No significant cell proliferation was observed in the transfected cells.
Conclusions:
- While HPV oncogenes were successfully transfected, they did not induce proliferation in C. quadricarinatus cells.
- Lack of telomere maintenance may prevent immortalization and proliferation.
- Further research is needed to address telomere dynamics for establishing permanent crustacean cell lines.
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