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[Preliminary analyses for influence of mutant PrPs with different number of octapeptide].

OBJECTIVE
The present study was conducted to understand the effects of PrP in different octapeptide repeats on proliferation of HeLa cells.


METHODS AND RESULTS
Mutant PrPs with octapeptide repeat insertion were transiently expressed in HeLa cells and their results of MTT assay showed stronger cytotoxic effect on the proliferation of cells than wild-type PrP. Annexin V/PI assay also demonstrated that the expression of mutant PrPs was much easier to induce apoptosis than wild-type in HeLa cells. The percentage of both early and late stage apoptosis in mutant groups were significantly higher than that of wild type.


CONCLUSION
These data suggest that the expression of mutant PrPs associated with familial CJD is much easier to induce apoptosis in cultured cells than expression of wild type PrP.