Selectivity Profile of the Tyrosine Kinase 2 Inhibitor Deucravacitinib Compared with Janus Kinase 1/2/3 Inhibitors.

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Chimalakonda A, Burke J, Cheng L, Catlett I, Tagen M, Zhao Q, Patel A, Shen J, Girgis IG, Banerjee S, Throup J

Selectivity Profile of the Tyrosine Kinase 2 Inhibitor Deucravacitinib Compared with Janus Kinase 1/2/3 Inhibitors.

Dermatol Ther (Heidelb). 2021 Oct;11(5):1763-1776. doi: 10.1007/s13555-021-00596-8. Epub 2021 Aug 30.

PubMed ID

34471993 [ View in PubMed

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Abstract

INTRODUCTION: Deucravacitinib, a novel, oral, selective inhibitor of tyrosine kinase 2 (TYK2) signaling, acts via an allosteric mechanism by binding to the enzyme's regulatory domain instead of the catalytic domain. This unique binding provides high functional selectivity for TYK2 versus the closely related Janus kinases (JAKs) 1/2/3. Deucravacitinib was efficacious in phase 2 and 3 psoriasis trials, without clinical or laboratory parameters indicative of JAK 1/2/3 inhibition being observed. This analysis compared the kinase specificities of deucravacitinib versus JAK 1/2/3 inhibitors at therapeutic exposures. METHODS: Signaling via JAK 1/3, JAK 2/2, and TYK2/JAK 2 dimers was measured in in vitro whole blood assays. Concentrations providing half-maximal inhibition (IC50) in these assays were determined for deucravacitinib and the JAK 1/2/3 inhibitors tofacitinib, upadacitinib, and baricitinib. Newly derived whole blood IC50 values were plotted against available pharmacokinetic profiles using doses evaluated in phase 2/3 trials. Simulated average daily inhibition and durations over which concentrations exceeded IC50 were evaluated. RESULTS: At clinically relevant exposures, projected steady-state deucravacitinib plasma concentrations were higher than TYK2 IC50 for approximately 9-18 h. Maximal plasma concentrations (Cmax) of deucravacitinib were 8- to 17-fold lower than JAK 1/3 IC50 and > 48- to > 102-fold lower than JAK 2/2 IC50. Simulated daily average TYK2 inhibition by deucravacitinib ranged from 50% to 69%. Simulations indicated that tofacitinib, upadacitinib, and baricitinib at steady state exhibited varying degrees of JAK 1/3 (daily average inhibition, 70-94%) and JAK 2/2 (23%-67%) inhibition at therapeutic concentrations, with Cmax values 17- to 33-fold lower than their TYK2 IC50 levels. CONCLUSION: At clinically relevant doses and exposures, deucravacitinib demonstrates highly selective inhibition of TYK2 and not JAK 1/2/3. Tofacitinib, upadacitinib, and baricitinib variably inhibit JAK 1/2/3 but not TYK2. These results indicate that deucravacitinib is a distinct class of kinase inhibitor compared with JAK 1/2/3 inhibitors.

DrugBank Data that Cites this Article

Drugs

Deucravacitinib

Drug Targets

Drug	Target	Kind	Organism	Pharmacological Action	Actions
Deucravacitinib	Non-receptor tyrosine-protein kinase TYK2	Protein	Humans	Yes	Inhibitor	Details