In Vitro: Acyl-CoA synthetase 4 (ACSL4) is an isoenzyme of the fatty acid ligase-coenzyme-A family taking part in arachidonic acid metabolism and steroidogenesis.PRGL493 ([3H]-AA (0.5 μCi/ml in serumfree medium) for 3 h; 48 hours) signifcantly inhibits the activity of ACSL4 in all three cell lines (MDA-MB-231, PC-3 and MA-10 Leydig cells), as evidenced by a reduction in AA-CoA levels.But PRGL493 has no effects on ACSL4 protein expression. PRGL493 (20-100 μM; 72 hours) inhibits the proliferation of highly aggressive breast and prostate cancer cells at an IC50 of 23 μM and 27 μM, respectively.
In Vivo: PRGL493 (intraperitoneal injection; 250 μg/Kg; 43 and 34 consecutive days) decreases tumor volumes and inhibits tumor growth. Additionally, this compound results in a decrease in Ki67 protein expression and increases ER and AR expression in breast and prostate xenograft tumors, respectively.