Abstract
RIN cells were infected with recombinant Semliki Forest virus (SFV) particles containing the LacZ gene. X-gal staining showed 100% infectivity of the cell cultures and high-level expression of bacterial beta-galactosidase in these cells. The cytopathogenic effects of the SFV infection were studied by measuring the viability of the RIN cells. Comparisons between control RIN cells and Bcl-2 overexpressing RIN cells were done 72 h post-infection. Significant differences in viability levels were observed. The control RIN cells showed in the MTT assay a mean value of 0.156+/-0.017 compared to 0.347+/-0.057 for the RIN/Bcl-2 cells. FACS analysis of cells labelled with propidium iodide indicated that only an average of 4.5+/-0.5% of the control cells were viable 72 h post-infection, while 44.5+/-3.5% of the RIN/Bcl-2 cells were still alive. Thus, the Bcl-2 overexpression clearly protected the SFV-infected cells from undergoing apoptosis.
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