Improving effects of topical administration of iganidipine, a new calcium channel blocker, on the impaired visual evoked potential after endothelin-1 injection into the vitreous body of rabbits.

Abstract:

PURPOSE:To investigate the effect of topical iganidipine, a new dihydropyridine derivative calcium channel blocker, on impairment of the ocular circulation caused by endothelin-1 (ET-1), we examined modification of the effect of ET-1 on visual-evoked potential (VEP) in albino rabbits. METHODS:To clarify whether VEP could be used to indicate the extent of ocular circulatory impairment, we evaluated the dose dependency of changes in VEP over 2 hours after intravitreal injection of 3 ET-1 doses (1.0, 3.3, or 10 pmol) and the vehicle. Then modification of the effect of ET-1 on the VEP by iganidipine was examined. One hour after the topical instillation of 0.1% iganidipine (20 microl) or its vehicle, 10 pmol of ET-1 was injected into the vitreous in rabbits. The VEP was measured for 2 hours after ET-1 application, and the response was compared between the eyes with iganidipine and vehicle pretreatment. RESULTS:Intravitreal injection of ET-1 dose-dependently reduced the VEP amplitude. Topical administration of 0.1% iganidipine significantly suppressed the reduction of VEP amplitude for the entire 2-hour monitoring period after intravitreal injection of 10 pmol ET-1. There was no significant change of the systemic blood pressure as well as intraocular pressure after topical administration of iganidipine. CONCLUSIONS:Iganidipine eyedrops may be useful for the treatment of ischemic retinal and optic nerve disorders related to abnormal ET-1 production for the maintenance of visual function.

journal_name

Curr Eye Res

journal_title

Current eye research

authors

Oku H,Sugiyama T,Kojima S,Watanabe T,Ikeda T

subject

Has Abstract

pub_date

2000-02-01 00:00:00

pages

101-8

issue

2

eissn

0271-3683

issn

1460-2202

journal_volume

20

pub_type

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