Cytotoxicity of human doppel protein and Dpl-like protein PrPΔ32-121 to SH-SY5Y cells

Objective To observe the biological activities of human doppel(Dpl) protein transiently expressed and Dpl-like protein PrPΔ32-121 on a human neuroblastoma cell line SH-SY5Y.Methods Recombinant mammalian expression plasmids containing human PRND gene and truncated PrPΔ32-121 fragment were generated by PCR.The expression and location of Dpl and PrPΔ32-121 post-transfection were observed by IFA.The cytotoxicity was measured by MTT analysis.Cellular apoptosis was investigated by flow cytometry and Western blot.Results Both Dpl and PrPΔ32-121 protein were expressed and mainly located on the cell membrane.Remarkable cytotoxicity was detected on SH-SY5Y cells after 24 h transfection.Meanwhile,more Annexin V/PI positively-stained cells as well as lower levels of cellular pro-caspase-3 and Bel-2 were detected in the cells receiving Dpl and PrPΔ32-121 expressing plasmids.Conclusion Dpl protein transiently expressed and PrPΔ32-121 can lead to the similar neural cytotoxicity,probably triggering the cell apoptosis program.