Flow cytometry was used to compare effects of caffeine or staurosporine on the radiation-induced G2-phase arrest and cyclin B1 expression in normal, human skin fibroblast (HSF) cells and HeLa cells following 6.0 Gy of gamma radiation. Caffeine and staurosporine were equally effective in attenuating both radiation induced increase in cyclin B1 expression and the prolongation of G2 in synchronous and asynchronous HeLa cell populations. Caffeine was also effective to a similar extent in irradiated HSF cells but staurosporine was ineffective in releasing the radiation-induced G2 block but did decrease cyclin B1 levels in those cell populations. These results suggest that staurosporine acts on different pathways of cell cycle controlling normal and transformed cells in response to radiation.

Agency
National Institute of Health (NIH)
Institute
National Center for Research Resources (NCRR)
Type
Biotechnology Resource Grants (P41)
Project #
3P41RR001315-16S1
Application #
6298016
Study Section
Project Start
1998-09-30
Project End
1999-06-30
Budget Start
1997-10-01
Budget End
1998-09-30
Support Year
16
Fiscal Year
1998
Total Cost
Indirect Cost
Name
Los Alamos National Lab
Department
Type
DUNS #
City
Los Alamos
State
NM
Country
United States
Zip Code
87545
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