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Substituted carboranes and polyhedral hydroborate salts as anti-neoplastics
I H Hall1, A Elkins, W J Powell
1Division of Medicinal Chemistry and Natural Products, School of Pharmacy, University of North Carolina, Chapel Hill 27599-7360, USA.
Abstract:
Substituted carboranes and polyhedral hydroborate salts were observed to be potent anti-neoplastic/cytotoxic agents inhibiting the growth of mouse and human leukemias, human uterine, colon adenocarcinoma, lung bronchogenic and gliomas. Amino-o-carborane-hydrochloride 7, one of the more potent compounds, preferentially inhibited Tmolt3 DNA synthesis. The target of the agent appears to be de novo purine synthesis with significant inhibition of the activities of both regulatory enzymes, PRPP-amido transferase and inosine monophosphate dehydrogenase as well as dihydrofolate reductase. The agent also inhibited nucleoside kinase activities leading to reductions in deoxyribonucleotide pools. The DNA molecule itself was not a target of the agent.
Insights
Substituted carboranes show potent anti-cancer activity against various leukemias and solid tumors. These compounds, like amino-o-carborane-hydrochloride 7, target DNA synthesis by inhibiting key enzymes in purine synthesis.
Area of Science:
- Medicinal Chemistry
- Oncology
- Biochemistry
Background:
- Substituted carboranes and polyhedral hydroborate salts exhibit anti-neoplastic and cytotoxic properties.
- These compounds have demonstrated efficacy against a range of cancers, including leukemias, adenocarcinomas, and gliomas.
Purpose of the Study:
- To investigate the anti-cancer potential of substituted carboranes and polyhedral hydroborate salts.
- To elucidate the mechanism of action of potent compounds like amino-o-carborane-hydrochloride 7 on cancer cell DNA synthesis.
Main Methods:
- In vitro assessment of cytotoxic and anti-neoplastic activity against various cancer cell lines.
- Analysis of the effects of amino-o-carborane-hydrochloride 7 on DNA synthesis in Tmolt3 cells.
- Enzyme activity assays to determine the inhibition targets of the carborane compounds.
Main Results:
- Amino-o-carborane-hydrochloride 7 preferentially inhibited Tmolt3 DNA synthesis.
- The compound targeted de novo purine synthesis by inhibiting PRPP-amido transferase and inosine monophosphate dehydrogenase.
- Dihydrofolate reductase and nucleoside kinase activities were also inhibited, leading to reduced deoxyribonucleotide pools.
Conclusions:
- Substituted carboranes are effective anti-cancer agents targeting critical enzymes in nucleotide biosynthesis.
- Amino-o-carborane-hydrochloride 7 represents a promising lead compound for further development in cancer therapy.
- The mechanism involves disruption of DNA synthesis through inhibition of purine and pyrimidine pathways.
