Abstract
The rapid increase in cancer cases worldwide necessitates the development of novel therapeutic approaches. Therapies targeting cancer's altered metabolism, especially those that deplete critical amino acids, have emerged as promising ones, some of which are already being used in clinical practice and many others are under development. This study reports the anti-cancer activity of two novel fused human arginase I (FHA) variants, FHA-3 and FHA-12, assessed using the NCI-60 human tumor cell line panel. Both variants have demonstrated a range of potencies in a single-dose assay (10µM), but FHA-3 was found to be more potent with significant growth inhibition in most tested cell lines.To calculate 50% growth inhibition (GI50), FHA-3 was further evaluated in a five-dose assay, where notable anti-cancer activity was observed across the nine cancer types of the NCI-60 panel. Our results demonstrated the broad-spectrum anti-cancer activity of novel FHA variants, with FHA-3 being the most potent. Further studies elucidating its efficacy in animal models will help explore its therapeutic potential.
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