9si2 | pdb_00009si2
Human DDR1 in complex with a pyrrolidine inhibitor
Structural highlights
FunctionPublication Abstract from PubMedIdiopathic pulmonary fibrosis (IPF) is a progressive lung disease, with excessive Extracellular Matrix (ECM) deposition impairing gas exchange, leading to lung failure. Current treatments are limited, with lung transplantation as the only cure. Discoidin Domain Receptors (DDR1/2), collagen-activated receptor tyrosine kinases, orchestrate collagen deposition in fibrotic diseases. We report the discovery and optimization of novel DDR1/2 kinase-domain inhibitors suitable for inhaled administration. Starting from a benzylamine scaffold, three chemical series, namely indolines, pyrrolidines, and azetidines, were explored. The first two showed potent DDR1 inhibition and lung retention but faced safety and selectivity challenges. The azetidine compound 37 was identified as the most promising one for its nanomolar potency, improved kinase selectivity, reduced cardiotoxicity risk, and excellent inhaled PK profile. It demonstrated activity in a collagen-induced pharmacodynamic mouse model, supporting its potential as an inhaled DDR inhibitor for IPF and validating the azetidine scaffold as a promising starting point for further optimization. A Journey through Scaffolds: Indolines, Pyrrolidines, and Azetidines in the Quest for Inhaled DDR Inhibitors for IPF.,Carzaniga L, Rancati F, Rizzi A, Mazzucato R, Iotti N, Ghidini E, Bertolini S, Bignami F, Fioni A, Mileo V, Vaccaro F, Murgo A, Freire Bento A, Capelli AM, Whittaker BP, Levanto S, Chapman RSL, Hamasova Z, Hardy CJ, Clark DE, Allen R, Briggs MA, Hann E, Lee S, Matthews C, Todd D, Hawkins J, Giuliani M J Med Chem. 2026 Mar 26;69(6):6610-6633. doi: 10.1021/acs.jmedchem.5c02830. Epub , 2026 Feb 20. PMID:41715301[1] From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. References
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