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Effect of antitumor agents on sarcoma-180 tumor cells transplanted to liver, kidney, and lung
Abstract:
The survival time of animals, inhibition of the incorporation of thymidine-[6-3H] (3H-TdR) into DNA, and histopathological observation were made after the injection of Mitomycin-C, Bleomycin, cyclophosphamide, Daunomycin, Actinomycin-D, or 5-fluorouracil into mice transplanted with sarcoma-180 to their liver, kidney, and lung. The most prolonged survival time was obtained by the injection with cyclophosphamide and a moderate prolonged survival by Bleomycin and Actinomycin-D. In the case of 5-fluorouracil and Daunomycin, there were extreme variations in the survival time depending on the site of tumor growth. Cyclophosphamide and 5-fluorouracil showed greater and longer lasting inhibition of the incorporation of 3H-TdR into DNA of the tumor tissue, whereas the remaining agents caused transient inhibition on the tumor tissue. Inhibitory ratio and duration of the incorporation of 3H-TdR into DNA of normal site of the tissue of tumor-bearing organ were found to be more increased or almost the same compared with those of the tumor tissue. The most rapid recovery of the incorporation of 3H-TdR into DNA was observed in the small intestine among various organs and tumor in any treatment groups. From the histopathological observation, the degree of tumor cell damage by the agent was almost in agreement with inhibition of the incorporation of 3H-TdR up to 72 hr after the treatment.
Insights
Cyclophosphamide and 5-fluorouracil prolonged survival and inhibited tumor DNA synthesis more effectively than other agents. Recovery of DNA synthesis varied by organ, with the small intestine showing the fastest recovery.
Area of Science:
- Oncology
- Pharmacology
- Biochemistry
Background:
- Chemotherapeutic agents are crucial in cancer treatment.
- Understanding their efficacy and impact on DNA synthesis is vital for optimizing treatment strategies.
Purpose of the Study:
- To evaluate the efficacy of various chemotherapeutic agents against sarcoma-180 in mice.
- To assess the impact of these agents on DNA synthesis and tumor cell damage.
Main Methods:
- Mice bearing sarcoma-180 in liver, kidney, and lung were injected with Mitomycin-C, Bleomycin, cyclophosphamide, Daunomycin, Actinomycin-D, or 5-fluorouracil.
- Survival time, thymidine-[6-3H] (3H-TdR) incorporation into DNA, and histopathological changes were analyzed.
Main Results:
- Cyclophosphamide and Bleomycin demonstrated the most significant survival benefits.
- Cyclophosphamide and 5-fluorouracil exhibited prolonged inhibition of 3H-TdR incorporation into tumor DNA.
- Histopathological damage correlated with 3H-TdR incorporation inhibition up to 72 hours post-treatment.
Conclusions:
- Cyclophosphamide and 5-fluorouracil are promising agents for sarcoma-180 treatment due to sustained DNA synthesis inhibition.
- Organ-specific recovery of DNA synthesis varies, with the small intestine showing rapid recovery.