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The role of the actomyosin system in regulating trabecular fluid outflow Tian B; Gabelt BT; Geiger B; Kaufman PLExp Eye Res 2009[Apr]; 88 (4): 713-7Abnormally high resistance to aqueous humor drainage via the trabecular meshwork and Schlemm's canal is highly correlated with the development of primary open-angle glaucoma. Contractility of the actomyosin system in the trabecular cells or inner wall endothelium of Schlemm's canal is an important factor in the regulation of outflow resistance. Cytoskeletal agents, affecting F-actin integrity or actomyosin contractility, or gene therapies, employing overexpression of caldesmon or Rho-A inhibition, can decrease outflow resistance in the drainage pathway. In this review, we discuss the mechanisms underlying these and similar effects on trabecular outflow resistance in living animals and/or in cultured ocular anterior segments from enucleated animal or human eyes.|Actomyosin/*physiology[MESH]|Animals[MESH]|Calmodulin-Binding Proteins/pharmacology[MESH]|Glaucoma, Open-Angle/physiopathology[MESH]|Humans[MESH]|Intraocular Pressure/drug effects/physiology[MESH]|Protein Kinase Inhibitors/pharmacology[MESH]|Trabecular Meshwork/drug effects/*physiology/ultrastructure[MESH]|Tubulin Modulators/pharmacology[MESH] |
