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Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)

Evaluation of the ocular hypotensive response of serotonin 5-HT1A and 5-HT2 receptor ligands in conscious ocular hypertensive cynomolgus monkeys.

Published investigations of serotonin-1A (5-hydroxytryptamine1A; 5-HT1A) receptor agonists and serotonin-2A (5-hydroxytryptamine2A; 5-HT2A) receptor antagonists in nonprimate species provide conflicting results with regard to their intraocular pressure-lowering efficacy. Thus, their therapeutic utility in the treatment of human glaucoma has been confusing. We evaluated the effect of selected 5-HT1A agonists and 5-HT2A receptor antagonists on intraocular pressure in a nonhuman primate model, the conscious cynomolgus monkey with laser-induced ocular hypertension. Neither selective 5-HT1A agonists [e.g., R-8-hydroxy-2-(di-n-propylamino)tetralin and flesinoxan] nor selective 5-HT2 receptor antagonists [e.g., R-(+)-alpha-(2,3-dimethoxyphenyl)-1-[2-(4-fluorophenyl)ethyl]-4-piperidinemethanol (M-100907) and 6-chloro-2,3-dihydro-5-methyl-N-[6-[(2-methyl-3-pyridinyl)oxy]-3-pyridinyl]-1H-indole-1-carboxamide (SB-242084)] lowered intraocular pressure in the primate model following topical ocular administration. However, compounds that function as agonists at both the 5-HT1A and 5-HT2 receptors were found to effectively lower intraocular pressure in the model: 5-hydroxy-alpha-methyltryptamine, 5-methoxy-alpha-methyltryptamine, 5-hydroxy-N,N-dimethyltryptamine (bufotenine), and 5-methoxy-N,N-dimethyltryptamine. Furthermore, the selective 5-HT2 receptor agonist R-(-)-1-(4-iodo-2,5-dimethoxyphenyl)-2-aminopropane lowered intraocular pressure in the primate model, demonstrating a pharmacological response associated with activation of the 5-HT2 receptor. These observations suggest that compounds that function as efficient agonists at 5-HT2 receptors should be considered as potential agents for the control of intraocular pressure in the treatment of ocular hypertension and glaucoma in humans.[1]


  1. Evaluation of the ocular hypotensive response of serotonin 5-HT1A and 5-HT2 receptor ligands in conscious ocular hypertensive cynomolgus monkeys. May, J.A., McLaughlin, M.A., Sharif, N.A., Hellberg, M.R., Dean, T.R. J. Pharmacol. Exp. Ther. (2003) [Pubmed]
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