Abstract:
:An intractable challenge in glaucoma treatment has been to identify druggable targets within the conventional aqueous humor outflow pathway, which is thought to be regulated/dysregulated by elusive mechanosensitive protein(s). Here, biochemical and functional analyses localized the putative mechanosensitive cation channel TRPV4 to the plasma membrane of primary and immortalized human TM (hTM) cells, and to human and mouse TM tissue. Selective TRPV4 agonists and substrate stretch evoked TRPV4-dependent cation/Ca(2+) influx, thickening of F-actin stress fibers and reinforcement of focal adhesion contacts. TRPV4 inhibition enhanced the outflow facility and lowered perfusate pressure in biomimetic TM scaffolds populated with primary hTM cells. Systemic delivery, intraocular injection or topical application of putative TRPV4 antagonist prodrug analogs lowered IOP in glaucomatous mouse eyes and protected retinal neurons from IOP-induced death. Together, these findings indicate that TRPV4 channels function as a critical component of mechanosensitive, Ca(2+)-signaling machinery within the TM, and that TRPV4-dependent cytoskeletal remodeling regulates TM stiffness and outflow. Thus, TRPV4 is a potential IOP sensor within the conventional outflow pathway and a novel target for treating ocular hypertension.
journal_name
Sci Repjournal_title
Scientific reportsauthors
Ryskamp DA,Frye AM,Phuong TT,Yarishkin O,Jo AO,Xu Y,Lakk M,Iuso A,Redmon SN,Ambati B,Hageman G,Prestwich GD,Torrejon KY,Križaj Ddoi
10.1038/srep30583subject
Has Abstractpub_date
2016-08-11 00:00:00pages
30583issn
2045-2322pii
srep30583journal_volume
6pub_type
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