Shi_2021_Eur.J.Drug.Metab.Pharmacokinet_46_129

Reference

Title : Rapalogues as hCES2A Inhibitors: In Vitro and In Silico Investigations - Shi_2021_Eur.J.Drug.Metab.Pharmacokinet_46_129
Author(s) : Shi CC , Song YQ , He RJ , Guan XQ , Song LL , Chen ST , Sun MR , Ge GB , Zhang LR
Ref : Eur J Drug Metab Pharmacokinet , 46 :129 , 2021
Abstract :

BACKGROUND AND OBJECTIVE: Rapamycin and its semi-synthetic analogues (rapalogues) are frequently used in combination with other prescribed medications in clinical settings. Although the inhibitory effects of rapalogues on cytochrome P450 enzymes (CYPs) have been well examined, the inhibition potentials of rapalogues on human esterases have not been investigated. Herein, the inhibition potentials and inhibitory mechanisms of six marketed rapalogues on human esterases are investigated. METHODS: The inhibitory effects of six marketed rapalogues (rapamycin, zotarolimus, temsirolimus, everolimus, pimecrolimus and tacrolimus) on three major esterases, including human carboxylesterases 1 (hCES1A), human carboxylesterases 2 (hCES2A) and butyrylcholinesterase (BuChE), were assayed using isozyme-specific substrates. Inhibition kinetic analyses and docking simulations were performed to investigate the inhibitory mechanisms of the rapalogues with strong hCES2A inhibition potency. RESULTS: Zotarolimus and pimecrolimus displayed strong inhibition of human hCES2A but these agents did not inhibit hCES1A or BuChE. Further investigation demonstrated that zotarolimus could strongly inhibit intracellular hCES2A in living HepG2 cells, with an estimated IC(50) value of 4.09 microM. Inhibition kinetic analyses revealed that zotarolimus inhibited hCES2A-catalyzed fluorescein diacetate hydrolysis in a mixed manner, with the K(i) value of 1.61 microM. Docking simulations showed that zotarolimus could tightly bind on hCES2A at two district ligand-binding sites, consistent with its mixed inhibition mode. CONCLUSION: Our findings demonstrate that several marketed rapalogues are potent and specific hCES2A inhibitors, and these agents can serve as leading compounds for the development of more efficacious hCES2A inhibitors to modulate the pharmacokinetic profiles and toxicity of hCES2A-substrate drugs (such as the anticancer agent irinotecan).

PubMedSearch : Shi_2021_Eur.J.Drug.Metab.Pharmacokinet_46_129
PubMedID: 33140264
Gene_locus related to this paper: human-CES2

Related information

Gene_locus human-CES2

Citations formats

Shi CC, Song YQ, He RJ, Guan XQ, Song LL, Chen ST, Sun MR, Ge GB, Zhang LR (2021)
Rapalogues as hCES2A Inhibitors: In Vitro and In Silico Investigations
Eur J Drug Metab Pharmacokinet 46 :129

Shi CC, Song YQ, He RJ, Guan XQ, Song LL, Chen ST, Sun MR, Ge GB, Zhang LR (2021)
Eur J Drug Metab Pharmacokinet 46 :129