Hoechst 33258 nuclear staining assay. Nuclear staining with Hoechst 33258 (Sigma Chemical Co.)
Briefly, treated and untreated cells were trypsinized and centrifuged at 1500 rpm to get the pellet which
then washed with PBS. The cells were smeared onto microscope slides then fixed with 4%
paraformaldehyde in PBS for 30 minutes at 4oC. After washing, the cells were incubated in Hoechst 33258
at a final concentration of 30μg/ml at RT for 30 minutes. Nuclear morphology was then examined under a
fluorescent microscope (Imaging Source Europe GmbH).