title: Effects of latanoprost on blood-retinal barrier permeability in rabbits.
abstract: OBJECTIVE
  To investigate the effect of latanoprost (LP) on the inward and outward permeability (Pin and Pout) of the blood-retinal barrier (BRB).
  
  
  METHODS
  Four New Zealand white rabbits received topical LP (0.005%) once daily for 3 weeks in one eye and phosphate-buffered saline (PBS) in the fellow eye (topical group). Five New Zealand white rabbits were injected intravitreously with LP (0.1 ml, 0.005%) in one eye and PBS (0.1 ml) in the fellow eye (injection group). In the injection group, vitreous fluorophotometry (VFP) to estimate the Pin and differential vitreous fluorophotometry (DVF) to estimate the Pout were performed 60 min after LP was injected. After the baseline measurements, VFP and DVF were performed 60 and 180 min after intravenous injection of sodium fluorescein, respectively. Fluorescein (F) and fluorescein monoglucuronide (FG) concentrations were obtained by DVF, and the F/FG ratio was calculated as an index of the Pout.
  
  
  RESULTS
  In the topical group, there were no significant differences in the Pin or F/FG ratio between the LP- and the PBS-treated eyes. In the injection group, the Pin in the LP-treated eyes was significantly higher than in PBS-treated eyes (p < 0.05). There was no significant difference in the F/FG ratio between the two groups.
  
  
  CONCLUSIONS
  Although we cannot exclude the effect of differences in species, the physiologic effect of LP, which increased the Pin, was seen in experimental studies. Because antiglaucoma drugs are generally used over an extended period, further clinical studies of the effect of LP on the BRB should be performed in patients who have BRB breakdown, such as in uveitis, and in patients who are pseudophakic and aphakic.
authors.affiliation: Department of Ophthalmology, Asahikawa Medical College, Asahikawa, Japan. kitaya@asahikawa-med.ac.jp
authors.forename: Norihiko
authors.initials: N
authors.lastname: Kitaya
authors.forename: Fumihiko
authors.initials: F
authors.lastname: Mori
authors.forename: Taiichi
authors.initials: T
authors.lastname: Hikichi
authors.forename: Junichi
authors.initials: J
authors.lastname: Takahashi
authors.forename: Akitoshi
authors.initials: A
authors.lastname: Yoshida
mesh_terms: D000287:Administration, Topical; D000818:Animals; D000959:Antihypertensive Agents / Q000494:pharmacology*; D001693:Biological Transport, Active / Q000187:drug effects; D001813:Blood-Retinal Barrier / Q000502:physiology*; D002199:Capillary Permeability / Q000187:drug effects; D003287:Contrast Media / Q000378:metabolism; D019793:Fluorescein / Q000378:metabolism; D015590:Fluorophotometry / Q000379:methods; D007267:Injections; D000077338:Latanoprost; D011461:Prostaglandins F, Synthetic / Q000494:pharmacology*; D011817:Rabbits; D012171:Retinal Vessels / Q000502:physiology*; D014822:Vitreous Body / Q000378:metabolism
chemical_list: D000959:Antihypertensive Agents; D003287:Contrast Media; D011461:Prostaglandins F, Synthetic; D000077338:Latanoprost; D019793:Fluorescein