6-Aminonicotinamide, a potent antimetabolite of nicotinamide, is competitive NADP+-dependent enzyme glucose-6-phosphate dehydrogenase (G6PD) inhibitor (Ki=0.46 μM) [1]. Immediately following 45 min i.v. infusion of [2-(13)C]glucose to controls and 6-AN-treated (50 mg/kg i.p. given 4 h previously) Sprague-Dawley rats (n = 5 for both groups), metabolism was arrested using freeze-funnel fixation. Chloroform-methanol-water neocortical extracts from animals administered with 6-AN demonstrated elevated levels of 6-phosphogluconate and 6-phosphoglucono-delta-lactone, both of which demonstrated labeling through metabolism of [2-(13)C]glucose[2]. 6-Aminonicotinamide (100 nM; 7 days) causes a significant decrease in the human AR+, hormone-sensitive prostate cancer cell lines LNCaP and LAPC4, as well as the CRPC-derivative C4-2 and 22Rv1 cell models. 6-Aminonicotinamide (100 nM ± 10 nM R1881 as indicated for 3 days) increases both basal- and R1881-mediated ROS levels, suggesting 6-Aminonicotinamide is blocking the cells' antioxidant defense. 6-Aminonicotinamide also increases ROS levels in C4-2 cells[3]. 6-Aminonicotinamide (20 mg/kg; i.p.; thress times; days 1, 10 or 11, and 21) alone induces a small but significant tumor growth delay (4.3+/-0.8 days). Treatment with 6-Aminonicotinamide followed by radiation induces a tumor growth delay of 57.0+/-3.8 days in CD8F1 breast tumor model[4].
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