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Effects of Topical Anandamide-Transport Inhibitors, AM404 and Olvanil, on Intraocular Pressure in Normotensive Rabbits

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Abstract

Purpose. To evaluate the effects of topically applied anandamide transport inhibitors, AM404 and olvanil, on the intraocular pressure (IOP) of normotensive rabbits. To determine if the ocular hypotension induced by topical anandamide (AEA) can be potentiated by co-administered AM404.

Methods. Test compounds, in either hydroxypropyl-β-cyclodextrin (HP-β-CD) or propylene glycol, were administered unilaterally onto rabbit eyes. To determine if AM404 affects the IOP-profile of AEA, AM404 was administered ocularly 15 minutes before topical AEA. Phenylmethylsulfonyl fluoride (PMSF) (24 mg/kg, s.c.) was given 30 min before AEA to prevent its catabolism. IOPs of the treated and untreated eyes were measured. The cannabinoid agonist activities of AM404 and olvanil were studied by using [35S]GTPγS autoradiography.

Results. Topical AM404 (62.5 μg), in HP-β-CD vehicle, decreased IOP significantly in treated eyes. AM404 (62.5 μg) induced a significant IOP increase without subsequent decrease when given in propylene glycol vehicle. Olvanil (312.5 μg) caused a significant IOP reduction without provoking an initial hypertensive phase. These compounds did not significantly affect the IOP of untreated eyes. Co-administered AM404 (125 μg in HP-β-CD) had no significant effect on the IOP profile of AEA (62.5 μg).

Conclusions. Ocular administration of AM404 or olvanil decreased IOP in rabbits, although AM404 can provoke an initial ocular hypertension and did not potentiate the IOP responses induced by exogenous AEA.

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Authors and Affiliations

  1. Department of Pharmaceutical Chemistry, University of Kuopio, Finland

    Krista Laine, Tomi Järvinen, David W. Pate & Kristiina Järvinen

  2. Department of Physiology, University of Kuopio, Finland

    Juha Savinainen & Jarmo T. Laitinen

  3. HortaPharm B.V., Amsterdam, The Netherlands

    David W. Pate

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Laine, K., Järvinen, T., Savinainen, J. et al. Effects of Topical Anandamide-Transport Inhibitors, AM404 and Olvanil, on Intraocular Pressure in Normotensive Rabbits. Pharm Res 18, 494–499 (2001). https://doi.org/10.1023/A:1011058411804

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