PIN1 inhibitor API-1 is a specific Pin1 (peptidyl-prolyl cis-trans isomerase NIMA-interacting 1) inhibitor with an IC50 of 72.3nM. PIN1 inhibitor API-1 targets the Pin1 peptidyl-prolyl isomerase domain and inhibits its cis-trans isomerase activity[1].
In vitro, PIN1 inhibitor API-1 decreased SK-Hep-1 cell proliferation with IC50 0.68μM[1]. PIN1 inhibitor API-1(1μM; 24-48h) significantly increased the expression of mature miRNAs including miR-122, let-7a, miR-29b and miR-146a[1]. PIN1 inhibitor API-1 inhibited the viability of BRAF-mutant thyroid cancer cell lines 8505C, BCPAP and SW1736, with IC50 values of 39.45±6.54μM, 49.97±7.73μM, and 44.70±6.86μM, respectively[2].
In vivo, treatment of PIN1 inhibitor API-1 (5mg/kg and 10mg/kg; i.v.; q2d; 16 days) suppressed tumor growth in SK-Hep-1- and Hep3B-derived hepatocellular carcinoma xenograft mouse models[1].
References:
[1]. Pu, Wenchen, et al. "Targeting Pin1 by inhibitor API‐1 regulates microRNA biogenesis and suppresses hepatocellular carcinoma development." Hepatology 68.2 (2018): 547-560.
[2]. Dang, Hui, et al. "Pin1 inhibitor API-1 sensitizes BRAF-mutant thyroid cancers to BRAF inhibitors by attenuating HER3-mediated feedback activation of MAPK/ERK and PI3K/AKT pathways." International Journal of Biological Macromolecules 248 (2023): 125867.
















