PRIMA-1

PRIMA-1 (NSC-281668) is a mutant p53 reactivator, restores the sensitivity of TP53 mutant-type thyroid cancer cells to the histone methylation inhibitor 3-Deazaneplanocin A. IC50 & Target: p53^[1] In Vitro: The cell lines are cultured in the presence of PRIMA-1 (NSC-281668) at 0-140 μM. The IC₅₀s are 35, 40, 50, 50, 60, 70 and 75 μM for PANC-1, HEC-1-B, SUM149, AN 3CA, Ishikawa, Panc02 and MDA-MB-231 cells, respectively^[2]. In Vivo: PRIMA-1 (Prima-1) is a p53-modulating agent. 150 or 300 ppm PRIMA-1 significantly suppresses (P<0.0001) lung adenocarcinoma formation by 56% and 62%, respectively, after 17 weeks and 39% and 56%, respectively, after 34 weeks. Administration of 150 or 300 ppm PRIMA-1 significantly suppresses NNK-induced total lung adenocarcinoma formation by 57% or 62% (P<0.0001), respectively, after 17 weeks of exposure and by 39% or 56% (P<0.0001), respectively, after 34 weeks of exposure. As with administration of the lower (50 ppm) dose of CP-31398, administration of the lower (150 ppm) dose of PRIMA-1also slightly increases the number of NNK-induced lung adenomas^[3].