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Effects of sodium cyanate in mice bearing B16 melanoma
Abstract:
Sodium cyanate injected IP at a dose level of 200 or 250 mg/kg caused a 90% or greater inhibition of the incorporation of [3H]thymidine into DNA of B16 melanoma transplanted SC in mice. Despite the inhibitory effect of sodium cyanate on precursor incorporation into DNA, no significant effect on host survival was observed when sodium cyanate was administered as a single agent in the diet, in drinking water, or by IP injection to mice that had received IP transplants of B16 melanoma. The action of melphalan and 1-(2-chloroethyl)-3-cyclohexyl-1-nitrosourea (CCNU) in prolonging the survival time of melanoma-bearing mice was not enhanced by combined treatment with sodium cyanate. However, combined injections of sodium cyanate and 1,3-bis(2-chloroethyl)-1-nitrosourea (BCNU) increased the survival of tumor-bearing mice significantly more than injections of BCNU alone at a lower dose than the maximum tolerated one. These data and other studies suggest that B16 melanoma may be less responsive to the action of sodium cyanate than are murine leukemic cells or rat hepatomas.
Insights
Sodium cyanate inhibits DNA synthesis in B16 melanoma cells. However, it did not improve survival alone or with melphalan/CCNU, but enhanced BCNU treatment in mice.
Area of Science:
- Oncology
- Pharmacology
- Biochemistry
Background:
- Sodium cyanate demonstrates inhibitory effects on DNA synthesis.
- B16 melanoma is a common model for studying cancer treatments.
- Understanding drug interactions is crucial for effective cancer therapy.
Purpose of the Study:
- To investigate the effect of sodium cyanate on B16 melanoma DNA synthesis and host survival.
- To evaluate the efficacy of sodium cyanate in combination with other chemotherapeutic agents against B16 melanoma.
Main Methods:
- Sodium cyanate was administered via intraperitoneal injection, diet, or drinking water to mice with B16 melanoma transplants.
- [3H]thymidine incorporation into DNA was measured.
- Combined treatments with melphalan, CCNU, and BCNU were assessed for their effects on host survival.
Main Results:
- Sodium cyanate significantly inhibited [3H]thymidine incorporation into B16 melanoma DNA.
- Single-agent administration of sodium cyanate did not improve host survival.
- Combination with BCNU, but not melphalan or CCNU, significantly increased survival time in tumor-bearing mice.
Conclusions:
- B16 melanoma exhibits reduced responsiveness to sodium cyanate compared to other tumor types.
- Sodium cyanate shows potential as an adjunct therapy when combined with specific chemotherapeutics like BCNU.
- Further research is warranted to explore the synergistic potential of sodium cyanate in cancer treatment.