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RKI-1447, a Rho kinase inhibitor, causes ocular hypotension, actin stress fiber disruption, and increased phagocytosis

Dang, Yalong ; Wang, Chao ; Shah, Priyal ; Waxman, Susannah ; Loewen, Ralitsa T. ; Loewen, Nils A.

Graefe's archive for clinical and experimental ophthalmology, 2019-01, Vol.257 (1), p.101-109 [Periódico revisado por pares]

Berlin/Heidelberg: Springer Berlin Heidelberg

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Título:
RKI-1447, a Rho kinase inhibitor, causes ocular hypotension, actin stress fiber disruption, and increased phagocytosis
Autor: Dang, Yalong ; Wang, Chao ; Shah, Priyal ; Waxman, Susannah ; Loewen, Ralitsa T. ; Loewen, Nils A.
Assuntos: Actin ; Animals ; Basic Science ; Cell migration ; Cells, Cultured ; Cytoskeleton ; Disease Models, Animal ; Glaucoma ; Glaucoma, Open-Angle - drug therapy ; Glaucoma, Open-Angle - physiopathology ; Hypotension ; Intraocular Pressure - drug effects ; Medicine ; Medicine & Public Health ; Ocular Hypotension - drug therapy ; Ocular Hypotension - metabolism ; Ocular Hypotension - physiopathology ; Ophthalmology ; Perfusion ; Phagocytes ; Phagocytosis ; Rho-associated kinase ; rho-Associated Kinases - antagonists & inhibitors ; Stress Fibers - drug effects ; Stress Fibers - metabolism ; Swine ; Thiazoles - pharmacology ; Trabecular Meshwork - drug effects ; Trabecular Meshwork - metabolism ; Trabecular Meshwork - pathology ; Urea - analogs & derivatives ; Urea - pharmacology
É parte de: Graefe's archive for clinical and experimental ophthalmology, 2019-01, Vol.257 (1), p.101-109
Descrição: Purpose This study investigated the hypotensive effect of RKI-1447, a Rho kinase inhibitor, in a porcine ex vivo pigmentary glaucoma model. Methods Twenty-eight porcine anterior chambers were perfused with medium supplemented with 1.67 × 10 7 pigment particles/ml for 48 h before treatment with RKI-1447 ( n = 16) or vehicle control ( n = 12). Intraocular pressure (IOP) was recorded and outflow facility was calculated. Primary trabecular meshwork cells were exposed to RKI-1447 or vehicle control; effects on the cytoskeleton, motility, and phagocytosis were evaluated. Result Compared to baseline, the perfusion of pigment caused a significant increase in IOP in the RKI-1447 group ( P = 0.003) at 48 h. Subsequent treatment with RKI-1447 significantly reduced IOP from 20.14 ± 2.59 to 13.38 ± 0.91 mmHg ( P = 0.02). Pigment perfusion reduced the outflow facility from 0.27 ± 0.03 at baseline to 0.18 ± 0.02 at 48 h ( P < 0.001). This was partially reversed with RKI-1447. RKI-1447 caused no apparent histological changes in the micro- or macroscopic TM appearance. RKI-1447-treated primary TM cells showed significant disruption of the actin cytoskeleton both in the presence and absence of pigment ( P < 0.001) but no effect on TM migration was observed. Pigment-treated TM cells exhibited a reduction in TM phagocytosis, which RKI-1447 reversed. Conclusion RKI-1447 significantly reduces IOP by disrupting TM stress fibers and increasing TM phagocytosis. These features may make it useful for the treatment of secondary glaucomas with an increased phagocytic load.
Editor: Berlin/Heidelberg: Springer Berlin Heidelberg
Idioma: Inglês

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RKI-1447, a Rho kinase inhibitor, causes ocular hypotension, actin stress fiber disruption, and increased phagocytosis

Dang, Yalong ; Wang, Chao ; Shah, Priyal ; Waxman, Susannah ; Loewen, Ralitsa T. ; Loewen, Nils A.

Berlin/Heidelberg: Springer Berlin Heidelberg

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