To visualize the formation of syncytium, BeWo cells were grown on coverslip in a 35 mm dish in the absence and presence of 8-Bromo-cAMP and fixed with freshly prepared ice-cold 4% para-formaldehyde for 15 minutes at room temperature followed by three PBS washes (5 minutes each). To stain the cytoskeleton, fixed cells were incubated with phalloidin (Cell Signaling Technology) at 1:200 dilution for 15 minutes. Then the cells were again washed with PBS for three times and incubated with Hoechst at a final concentration of 2 mg/ml for another 15 minutes to stain the nuclei. Then the cells were rinsed with PBS for several times and finally, the coverslip was mounted on a glass slide with the help of fluoroshield (Sigma, USA) and examined under Leica epifluorescence microscope.
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