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1 General aspects (0)   1.1 Epidemiology (14)   1.2 Population genetics (0)   1.3 Pathogenesis (0)   1.4 Quality of life (13)   1.5 Glaucomas as cause of blindness (5)   1.6 Prevention and screening (6) 2 Anatomical structures in glaucoma (0)   2.1 Conjunctiva (6)   2.2 Cornea (23)   2.3 Sclera (5)   2.4 Anterior chamber angle (6)   2.5 Meshwork (0)     2.5.1 Trabecular meshwork (7)     2.5.2 Schlemms canal (0)     2.5.3 Scleral outlet channels (0)   2.6 Aqueous humor dynamics (1)     2.6.1 Production (1)     2.6.2 Outflow (1)       2.6.2.1 Trabecular meshwork (3)       2.6.2.2 Uveoscleral (0)     2.6.3 Compostion (0)   2.7 Episcleral veins and venous pressure (0)   2.8 Iris (7)   2.9 Ciliary body (0)   2.10 Lens (2)   2.11 Vitreous body (1)   2.12 Choroid, peripapillary choroid, peripapillary atrophy (1)   2.13 Retina and retinal nerve fibre layer (38)   2.14 Optic disc (22)   2.15 Optic nerve (6)   2.16 Chiasma and retrochiasmal central nervous system (3)   2.17 Stem cells (1)   2.20 Other (0) 3 Laboratory methods (0)   3.1 Microscopy (1)   3.2 Electron microscopy (0)   3.3 Immunohistochemistry (4)   3.4 Molecular genetics (0)     3.4.1 Linkage studies (3)     3.4.2 Gene studies (23)   3.5 Molecular biology incl. 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Miscellaneous (6)

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Abstract #21375 Published in IGR 10-2

Effects of pharmacologic inhibition of protein geranylgeranyltransferase type I on aqueous humor outflow through the trabecular meshwork

Rao PV; Peterson YK; Inoue T; Casey PJ
Investigative Ophthalmology and Visual Science 2008; 49: 2464-2471

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PURPOSE: To determine the effects of inhibition of protein geranylgeranyltransferase type I (GGTase-I), which isoprenylates so-called CaaX proteins, including the GTP-binding proteins such as Rho GTPases and the betagamma subunits of heterotrimeric G-proteins, on aqueous humor outflow and trabecular meshwork cytoskeletal integrity. METHODS: A selective small molecular inhibitor of GGTase-I, GGTI-DU40, was tested in this study to investigate its effects on actin cytoskeletal integrity, cell adhesions, cell-cell junctions, myosin II phosphosphorylation, and membrane localization of GTP-binding proteins in trabecular meshwork (TM) cells, using immunofluorescence detection and immunoblotting analysis. The effects of GGTI-DU40 on aqueous humor outflow were determined using organ-cultured, perfused anterior segments of porcine eyes. RESULTS: In the TM cell lysates, GGTI-DU40 was confirmed to inhibit GGTase-I activity in a dose-dependent manner. TM cells treated with GGTI-DU40 displayed dose-dependent changes in cell morphology and reversible decreases in actin stress fibers, focal adhesions, and adherens junctions. Myosin light chain phosphorylation was decreased significantly, and membrane localization of isoprenylated small GTPases and Gbetagamma was impaired in drug-treated TM cells. Aqueous outflow facility was increased significantly in eyes perfused with GGTI-DU40. CONCLUSIONS: These data demonstrate that inhibition of geranylgeranyl isoprenylation of CaaX proteins in the aqueous outflow pathway increases aqueous humor outflow, possibly through altered cell adhesive interactions and actin cytoskeletal organization in cells of the outflow pathway. This study indicates that the GGTase-I enzyme is a promising molecular target for lowering increased ocular pressure in glaucoma patients.

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Classification:

2.6.2.1 Trabecular meshwork (Part of: 2 Anatomical structures in glaucoma > 2.6 Aqueous humor dynamics > 2.6.2 Outflow)
3.8 Pharmacology (Part of: 3 Laboratory methods)
3.6 Cellular biology (Part of: 3 Laboratory methods)

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