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A major pathway for the regulation of intraocular pressure

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Abstract

There has been a suspicion on the part of many clinicians and research scientists that intraocular pressure can be regulated by neural and/or humoral influences upon the rate of aqueous humor formation. It has been difficult, if not impossible, to separate specific influences of the central nervous system upon intraocular pressure from vascular induced or other secondary alterations. The past two decades have witnessed a great deal of study of the role of the adrenergic nervous system upon the regulation of intraocular pressure. From the investigations it is possible to formulate an integrated concept that can place years of work and speculation on a firm molecular foundation. The secretory tissue of the eye, the ciliary processes, contain an enzyme receptor complex, comprised by receptor complex, comprised by receptor bound membrane proteins, the catalytic moiety of the enzyme, a guanyl nucleotide regulatory protein (or N protein) and other features. The enzyme can be activated by well known neurohumoral or humoral agents that consist of catecholamines, glycoprotein hormones produced by the hypothalmic pituitary axis, and other related compounds, including placental gonadotropin. These compounds cause the ciliary epithelia to produce cyclic AMP at an accelerated rate. Cyclic AMP, as a second messenger, causes, either directly or indirectly, a decrease in the rate of aqueous humor formation that may be modulated by cofactors. Clinical syndromes fit the experimental data so that an integrated explanation can be given for the reduced intraocular pressure witnessed under certain central nervous system and adrenergic influences. The molecular biology of this concept provides important leads for future investigations that bear directly both upon the regulation of intraocular pressure and upon glaucoma.

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Authors and Affiliations

  1. Department of Ophthalmology and Visual Science, Yale University School of Medicine, 310 Cedar Street, P.O. Box 3333, CT 06510, New Haven, U.S.A.

    Marvin Sears & Alden Mead

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  1. Marvin Sears
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  2. Alden Mead
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This work was supported in part by grants from the Connecticut Lions Eye Research Foundation, Inc., Foresight, Inc., New Haven Foundation, and Research to Prevent Blindness, Inc.

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Sears, M., Mead, A. A major pathway for the regulation of intraocular pressure. Int Ophthalmol 6, 201–212 (1983). https://doi.org/10.1007/BF00141129

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