Abstract
Colorectal cancer cells exhibit limited cytotoxicity towards Tiazofurin, a pro-drug metabolized by cytosolic nicotinamide mononucleotide adenylyltransferase2 (NMNAT2) to thiazole-4-carboxamide adenine dinucleotide, a potent inhibitor of inosine 5′-monophosphate dehydrogenase required for cellular guanylate synthesis. We tested the hypothesis that colorectal cancer cells that exhibit low levels of NMNAT2 and are refractory to Tiazofurin can be rendered sensitive to Tiazofurin by overexpressing NMNAT2. Transfection of hNMNAT2 resulted in a six- and threefold cytoplasmic overexpression in Caco2 and HT29 cell lines correlating with Tiazofurin-induced enhanced cell-kill. Folate receptors expressed on the cell surface of 30–50% colorectal carcinomas were exploited for cellular targeting with Tiazofurin encapsulated in folate-tethered nanoparticles. Our results indicated that in wild-type colorectal cancer cells, free Tiazofurin-induced EC50 cell-kill was 1500–2000 μM, which was reduced to 66–156 μM in hNMNAT2-overexpressed cells treated with Tiazofurin encapsulated in non-targeted nanoparticles. This efficacy was improved threefold by encapsulating Tiazofurin in folate-tethered nanoparticles to obtain an EC50 cell-kill of 22–59 μM, an equivalent of 100–300 mg m−2 (one-tenth of the approved dose of Tiazofurin in humans), which will result in minimal toxicity leading to cancer cell-kill. This proof-of-principle study suggests that resistance of colorectal cancer cell-kill to Tiazofurin can be overcome by sequentially overexpressing hNMNAT2 and then facilitating the uptake of Tiazofurin by folate-tethered nanoparticles, which enter cells via folate receptors.
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Abbreviations
- FR:
-
folate receptors-α
- IMPDH:
-
inosine 5′-monophosphate dehydrogenase
- NMNAT:
-
nicotinamide 5′-mononucleotide adenylyltransferase
- TAD:
-
thiazole-4-carboxamide adenine dinucleotide
- TRMP:
-
tiazofurin 5′-monophosphate
- TR:
-
Tiazofurin (2-ß-D-ribofuranosylthiazole-4-carboxamide).
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Acknowledgements
This work was supported by the United States Veterans Affairs Merit Review Award to Hiremagalur N Jayaram, PhD.
Author contributions
HNJ and ACA contributed to conception and design of the research, acquision of data, analysis and interpretation of data, drafting of the manuscript. PK, YZ, MBJ, NHJ, RAK and YT contributed to the acquisition of data, analysis and interpretation of data and final approval of the manuscript.
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A provisional patent application based on this work was filed by the technology transfer program of the United States Department of Veteran Affairs, Washington, DC for Drs Hiremagalur N Jayaram, Asok C Antony and Praveen Kusumanchi. The remaining authors, Drs Yonghua Zhang, Mehul B Jani, Nagesh H Jayaram, Rehana A Khan and Yingsheng Tang declare no conflict of interest.
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Kusumanchi, P., Zhang, Y., Jani, M. et al. Nicotinamide mononucleotide adenylyltransferase2 overexpression enhances colorectal cancer cell-kill by Tiazofurin. Cancer Gene Ther 20, 403–412 (2013). https://doi.org/10.1038/cgt.2013.33
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DOI: https://doi.org/10.1038/cgt.2013.33