PRN 1008

PRN1008 is a reversible covalent inhibitor of Bruton’s Tyrosine Kinase (BTK), with an IC50 of 1.3 nM.

Signaling Pathways >> Protein Tyrosine Kinase/RTK >> Btk

Research Areas >> Metabolic Disease

Research Areas >> Cancer

BTK:1.3 nM (IC50)

BMX:1.0 nM (IC50)

ITK:440 nM (IC50)

TEC:0.8 nM (IC50)

RLK:1.2 nM (IC50)

BLK:6.3 nM (IC50)

EGFR:520 nM (IC50)

ERBB2:3900 nM (IC50)

ERBB4:11.3 nM (IC50)

PRN1008 is a reversible covalent inhibitor of Bruton’s Tyrosine Kinase (BTK), with an IC50 of 1.3±0.5 nM. PRN1008 is also found to be highly selectively when tested in a panel of 251 other kinases. Cysteine targeting of BTK by PRN1008 results in a slow off-rate demonstrated by retention of 79±2% of binding to BTK in PBMC 18 hours after washing away the compound in vitro. The covalent cysteine binding is completely reversible after denaturation of the target. Anti-IgM induces human B cell proliferation (10% serum) and B cell CD69 expression are inhibited by PRN1008 with IC50 of 5±2.4 nM and 123±38 nM, respectively[2].

In vivo PRN1008 demonstrates enduring pharmacodynamic effects after the compound has cleared from circulation, consistent with extended target residence time. PRN1008 also reverses and completely suppresses collagen-induced arthritis in rats in a dose dependent manner which allows correlation of target occupancy and disease modification[2].

[1]. Smith PF, et al. A phase I trial of PRN1008, a novel reversible covalent inhibitor of Bruton's tyrosine kinase, in healthy volunteers. Br J Clin Pharmacol. 2017 Nov;83(11):2367-2376.

[2]. Hill RJ, Bradshaw JM, Bisconte A, Tam D, Owens TD, Brameld KA, Smith PF, Funk JO, Goldstein DM, Nunn PA. Preclinical Characterization of PRN1008, a Novel Reversible Covalent Inhibitor of BTK that Shows Efficacy in a RAT Model of Collagen-Induced Arthritis. Annals of the Rheumatic Diseases 2015; 74(Suppl 2): 216.

Acalabrutinib | GDC-0853 | Evobrutinib | AVL-292 | (±)-Zanubrutinib | ONO-4059 | BMX-IN-1 | GDC-0834 | SNS-062 | RN486 | LFM-A13 | Vecabrutinib | CGI-1746 | BMS-986195 | CNX-774