Abstract
Acyloxyalkyl ester prodrugs of histone deacetylase inhibitors, a family of anti-cancer agents, are metabolized intracellularly to acids and aldehyde(s). The purpose of this study was to assess the in vitro and in vivo anticancer activity, selectivity and oral bioavailability of these prodrugs. The prodrugs exhibited a hierarchal potency of AN-193 > or = AN-7 > AN-1 and AN-9 > AN-10 against murine lung carcinoma (3LLD122) and human breast carcinoma (MCF-7) cell lines. AN-9, and to even greater extent AN-7, displayed preferential cytotoxicity against leukemic and glioblastoma cells compared to their normal cellular counterparts-normal mononuclear and astrocytes cells, respectively. In vivo, anti-metastatic activity was evaluated in a metastatic model of lung cancer in which Lewis lung carcinoma (3LLD122) cells are injected intravenously into C57/BL mice and produce lung nodules. The prodrugs administered orally demonstrated a significant inhibition of lung-lesion formation and their hierarchal potency concurred with that observed in vitro, with the exception of AN-193 that was the least active compound. Escalating doses of AN-7 (5-100 mg/kg), administered by oral or intraperitoneal routes and displayed equivalent anti-metastatic ...Continue Reading
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