Regulation and deregulation of G2 checkpoint proteins with cisplatin

M. Links*, J. Ribeiro, P. Jackson, M. Friedlander, P.J. Russell

*Corresponding author for this work

Research output: Contribution to journalArticleResearchpeer-review

9 Citations (Scopus)


Background. The G2 checkpoint has a key role in the response to DNA damage. G2 arrest following DNA damage is associated with inactivation of the protein kinase cyclin B-cdc2. The role of changes in protein expression in enzyme inhibition is controversial. Methods. Expression of cyclin B1, cdc2, cdc25c, total protein and DNA content were examined by flow cytometry in two lung cancer cell lines. Changes in protein expression were compared to cell cycle matched controls under conditions associated with and without G2 arrest. Results. Total protein increased with G2 arrest and decreased with cell death. Changes in cdc2, cdc25c and p16 paralleled changes in total protein. A larger increase in cyclin B1 was seen which was due to cell cycle redistribution. Deregulation of cyclin B1 was seen with a sublethal dose of cisplatin. Conclusions. Our results do not support the model that changes in expression of cyclin B1 or other checkpoint proteins mediate G2 arrest after cisplatin.
Original languageEnglish
Pages (from-to)4057-4066
Number of pages9
JournalAnticancer Research
Issue number6A
Publication statusPublished - 1998
Externally publishedYes


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