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Double transformation of Indian muntjac cells by avian and murine sarcoma viruses
Abstract:
Avian sarcoma virus-transformed Indian muntjac cells, SR-Mm-1, formed foci by murine sarcoma-xenotropic murine leukemia virus complex [MSV(X-MuLV)] superinfection. The response of SR-Mm-1 and parental normal Indian muntjac Mm-2K cells to MSV(X-MuLV) infection was compared. Focus formation by MSV(X-MuLV) followed two-hit kinetics in Mm-2K, but one-hit kinetics in SR-Mm-1 cells. MSV(X-MuLV)-infected SR-Mm-1 cells formed larger colonies than uninfected SR-Mm-1 cells in soft agar, while no colony was formed in the MSV(X-MuLV)-infected Mm-2K cells. After infection with MSV(X-MuLV), cell clones doubly transformed by avian and murine sarcoma viruses could be established in SR-Mm-1 cells, whereas no cell clone could be established in Mm-2K cells. The doubly transformed cells were more round and refractile than SR-Mm-1 cells. No specific chromosomal change could be detected among Mm-2K, SR-Mm-1, and the doubly transformed cells. By two-dimensional polyacrylamide gel electrophoresis of cellular proteins, several changes were seen between Mm-2K and SR-Mm-1 cells. In MSV(X-MuLV)-infected Mm-2K and SR-Mm-1 cells, several similar changes in polypeptide patterns were seen as compared with uninfected cells. These results indicate that Mm-2K cells were doubly transformed by avian and murine sarcoma viruses, and MSV transformation in SR-Mm-1 cells was different from that in Mm-2K cells.
Insights
Avian and murine sarcoma virus infections were studied in Indian muntjac cells. SR-Mm-1 cells showed one-hit kinetics and enhanced growth, unlike Mm-2K cells, indicating distinct transformation mechanisms.
Area of Science:
- * Molecular biology
- * Virology
- * Cell biology
Background:
- * Indian muntjac cells (SR-Mm-1) transformed by avian sarcoma virus were studied.
- * Parental normal Indian muntjac cells (Mm-2K) were used as a control.
Purpose of the Study:
- * To compare the response of SR-Mm-1 and Mm-2K cells to murine sarcoma virus-xenotropic murine leukemia virus complex (MSV(X-MuLV)) superinfection.
- * To investigate the transformation mechanisms of avian and murine sarcoma viruses in different cell types.
Main Methods:
- * Focus formation assays to determine infection kinetics.
- * Soft agar colony formation assays to assess transformation potential.
- * Two-dimensional polyacrylamide gel electrophoresis (2D-PAGE) to analyze cellular protein changes.
Main Results:
- * MSV(X-MuLV) infection exhibited one-hit kinetics in SR-Mm-1 cells versus two-hit kinetics in Mm-2K cells.
- * SR-Mm-1 cells showed enhanced soft agar colony formation post-infection, while Mm-2K cells did not.
- * Doubly transformed cell clones (avian and murine sarcoma viruses) were established in SR-Mm-1 but not in Mm-2K cells.
- * Protein analysis revealed distinct changes between Mm-2K and SR-Mm-1 cells, with some shared changes upon MSV(X-MuLV) infection.
Conclusions:
- * SR-Mm-1 cells are doubly transformed by avian and murine sarcoma viruses.
- * MSV transformation in SR-Mm-1 cells differs significantly from that in Mm-2K cells.
- * The study highlights distinct cellular responses to viral transformation based on cell type and prior transformation status.