Laser Flow Cytofluorometric Analysis of Htc Cells Synchronized With Hydroxyurea, Nocodazole and Aphidicolin

The technique of laser flow cytofluorometry has been used to monitor the arrival in G₁ and the subsequent progression through the cell cycle of HTC cells accumulated in metaphase with colcemid alone or after treatment with hydroxyurea and Nocodazole. Under the experimental conditions used in this study, the latter procedure gives much better results, avoiding in particular the extensive formation of micronucleated cells. Aphidicolin, an inhibitor of DNA polymerase, in combination with Nocodazole, provides a useful method to tightly synchronize these cells at the G₁/S border.