Abstract
The cytotoxic activity of various chemotherapy agents was investigated in asynchronous populations of cultured 9L rat brain tumor cells, and as a function of their position in the cell cycle. Representative drugs from the classes of DNA-active agents, alkylating agents, spindle poisons, and antimetabolites were tested. The ability to induce cell lethality in asynchronous populations as a function of drug concentration varied for 1 hr pulse exposures. In order of decreasing cytotoxic activity, DHAQ was the most effective, followed by VCR, VDS, VBL, ADR, BCNU, cis-DDP, BLM, DBD, RZ, and HU. The effect of chemotherapy agents on synchronous 9L cells obtained by mitotic selection also varied with respect to the individual agent and was cell cycle-dependent. Survival age-responses ranged from being minimal to demonstrating significant fluctuations as a function of cell cycle position. For all agents except ADR and HU, the sensitivity of G1 phase was greater than S phase. RZ exhibited essentially a flat age-response. Comparison of the cell cycle age-responses of chemotherapeutic agents to those exhibited by the cytotoxic modalities of radiation and hyperthermia demonstrate several unique differences.
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Abbreviations
- ADR:
-
Adriamycin
- BCNU:
-
1,3-Bis (2-Chloroethyl)-1-Nitrosourea
- BLM:
-
Bleomycin sulfate
- cis-DDP:
-
cis-Dichlorodiamineplatinum
- DHAQ:
-
Dihydroxy anthraquinone
- DBD:
-
Dibromodulcitol
- HU:
-
Hydroxyurea
- RZ:
-
Razoxane
- VBL:
-
Vinblastine Sulfate
- VCR:
-
Vincristine Sulfate
- VDS:
-
Vindesine Sulfate
- HBSS:
-
Hanks' Balanced Salt Solution
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Henderson, S.D., Kimler, B.F. & Barnes, M.L. Comparison of cancer chemotherapeutic agents in asynchronous and synchronous 9L cells. Invest New Drugs 5, 145–154 (1987). https://doi.org/10.1007/BF00203539
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DOI: https://doi.org/10.1007/BF00203539