Netarsudil (formerly known as AR-13324; AR13324; trade name Rhopressa) is ROCK inhibitor approved in 2017 for the treatment of glaucoma and ocular hypertension. It inhibits ROCK with Ki of 0.2-10.3 nM. Netarsudil also inhibits norepinephrine transport activity which can reduce the production of aqueous humor. As of 2018, Netarsudil has been approved by FDA for the treatment of glaucoma and ocular hypertension. Previous study showed that at the cellular level, netarsudil was able to induce loss of actin stress fibers, cell shape changes, loss of focal adhesions, as well as changes in extracellular matrix composition of TM cells. Netarsudil primarily targets cells in the conventional outflow tract, efficiently decreasing IOP in both human and non-human primate eyes. In addition, netarsudil has been shown to increase outflow facility in non-human primate eyes and to decrease episcleral venous pressure in rabbit eyes.
Physicochemical Properties
| Molecular Formula | C28H27N3O3 | |
| Molecular Weight | 453.54 | |
| Exact Mass | 453.205 | |
| Elemental Analysis | C, 74.15; H, 6.00; N, 9.27; O, 10.58 | |
| CAS # | 1254032-66-0 | |
| Related CAS # | 1422144-42-0 (mesylate);1254032-66-0;1253952-02-1 (HCl); | |
| PubChem CID | 66599893 | |
| Appearance | White to off-white solid powder | |
| Density | 1.3±0.1 g/cm3 | |
| Boiling Point | 711.9±60.0 °C at 760 mmHg | |
| Flash Point | 384.3±32.9 °C | |
| Vapour Pressure | 0.0±2.3 mmHg at 25°C | |
| Index of Refraction | 1.667 | |
| LogP | 3.53 | |
| Hydrogen Bond Donor Count | 2 | |
| Hydrogen Bond Acceptor Count | 5 | |
| Rotatable Bond Count | 8 | |
| Heavy Atom Count | 34 | |
| Complexity | 678 | |
| Defined Atom Stereocenter Count | 1 | |
| SMILES | O(C(C1C=CC(C)=CC=1C)=O)CC1C=CC(=CC=1)[C@H](C(NC1C=CC2C=NC=CC=2C=1)=O)CN |
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| InChi Key | OURRXQUGYQRVML-AREMUKBSSA-N | |
| InChi Code | InChI=1S/C28H27N3O3/c1-18-3-10-25(19(2)13-18)28(33)34-17-20-4-6-21(7-5-20)26(15-29)27(32)31-24-9-8-23-16-30-12-11-22(23)14-24/h3-14,16,26H,15,17,29H2,1-2H3,(H,31,32)/t26-/m1/s1 | |
| Chemical Name | Benzoic acid, 2,4-dimethyl-, (4-((1S)-1-(aminomethyl)-2-(6-isoquinolinylamino)-2-oxoethyl)phenyl)methyl ester | |
| Synonyms |
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| HS Tariff Code | 2934.99.9001 | |
| Storage |
Powder-20°C 3 years 4°C 2 years In solvent -80°C 6 months -20°C 1 month |
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| Shipping Condition | Room temperature (This product is stable at ambient temperature for a few days during ordinary shipping and time spent in Customs) |
Biological Activity
| Targets |
Rho-associated protein kinas/ROCK; norepinephrine transporter/NET
Rho kinase; norepinephrine transporter [1] Rho kinase; norepinephrine transporter [2] |
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| ln Vitro |
In vitro activity: Previous study showed that at the cellular level, netarsudil had been shown to be able to induce loss of actin stress fibers, cell shape changes, loss of focal adhesions, as well as changes in extracellular matrix composition of TM cells Kinase Assay: Netarsudil (formerly known as AR-13324) is ROCK inhibitor with Ki of 0.2-10.3 nM. It also inhibits norepinephrine transport activity which can reduce the production of aqueous humor. Cell Assay: Previous study showed that at the cellular level, netarsudil had been shown to be able to induce loss of actin stress fibers, cell shape changes, loss of focal adhesions, as well as changes in extracellular matrix composition of TM cells. Ex vivo perfusion of enucleated mouse eyes with netarsudil mesylate (100 nM) increased outflow facility compared to vehicle (0.001% DMSO) treatment. For C57BL/6 mice (n=8), the treatment led to a significant average increase in outflow facility (P=0.006), and for CD1 mice (n=6), a significant increase was also observed (P=0.025). The flow-pressure relationship was analyzed through 9 sequential pressure steps after 45-60 min of perfusion with the drug or vehicle [1] Perfusion of enucleated human eyes with 0.3 μM netarsudil-M1 (active metabolite) at constant pressure (15 mmHg) for 3 hours significantly increased outflow facility (C) by 51% compared to baseline (P<0.01) and by 102% compared to paired vehicle controls (P<0.01). It also significantly increased the percentage effective filtration length (PEFL) in the inner wall (IW) of Schlemm's canal (SC) (P<0.05) and episcleral veins (ESVs) (P<0.01). In treated eyes, PEFL in ESVs was significantly higher than in IW (P<0.01) and positively correlated with the percentage change in C (R²=0.58, P=0.01). Additionally, the cross-sectional area of ESVs (P<0.01) and juxtacanalicular connective tissue (JCT) thickness (P<0.05) were significantly increased compared to controls [2] |
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| ln Vivo |
Animal efficacy study found that the topical treatment of netarsudil was able to affect both proximal (trabecular meshwork and Schlemms Canal) and distal portions (intrascleral vessels) of the mouse conventional outflow tract. Topical administration of 10 μl of 0.04% netarsudil mesylate to right eyes of 10-week-old C57 mice and 6-14 week-old CD1 mice (5 mice/group) significantly lowered intraocular pressure (IOP) compared to placebo (CF324-01) treatment (P<0.05 or P<0.01 for different strains) [1] Intracameral preloading of 100 nM netarsudil mesylate into contralateral eyes of living mice (n=8) enhanced IOP recovery after artificial elevation to 40 mmHg. The rate constant α (characterizing pressure decay) was significantly increased compared to vehicle (0.001% DMSO) treatment (P<0.01) [1] Topical netarsudil treatment in living C57 mice led to widening of the trabecular meshwork (TM) and a significant increase in the cross-sectional area of SC, as visualized by optical coherence tomography (OCT) imaging 45 min post-treatment. It also increased speckle variance intensity of outflow vessels, enhanced tracer deposition in conventional outflow tissues, and decreased IOP [1] In living mice with elevated IOP, topical netarsudil treatment (10 μl of 0.04%) increased the cross-sectional area of SC lumen when IOP was controlled at 10, 15, and 30 mmHg (P<0.05 or P<0.01). OCT imaging showed significant changes in SC area relative to baseline (10 mmHg pre-treatment) in both C57 and CD1 mice (n=11) [1] Topical netarsudil treatment in C57 and CD1 mice increased the cross-sectional area and speckle variance intensity of scleral vessels involved in aqueous humor outflow, as analyzed by OCT speckle variance images 30-60 min post-treatment (P<0.05) [1] |
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| Enzyme Assay | A total of 23 ROCK structures were found in the PDB. The maximum and minimum resolutions were 3.4 Å and 2.93 Å, respectively. Seven ROCK-I and two ROCK-II non-redundant structures were selected for the binding assay. Out of 46 compounds tested (20 isoquinolines, 15 aminofurazan, 6 benzodiazepine, 4 indazoles, and 1 amide), 34 presented a significantly higher docking score for ROCK-1, when compared to Y-27632 (p < 0.0001). All ROCKi classes presented a stronger mean docking score than Y-27632 (p < 0.0001). The frequency of compounds presenting highest docking score was higher in the isoquinoline, aminofurazan, and benzodiazepine classes for ROCK-I; and in isoquinolines and amides for ROCK-II (Supplementary Figure S2A). The top ten compounds that presented the highest mean docking scores for ROCK-I and II are shown in Supplementary Figure S2B. The isoquinoline class represented 70% of the drugs within the top ten highest docking scores, with three compounds presenting a docking score stronger than |
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