Kaya M, Tunç M, Ozdemir T, Altuntaş I. Calcium antagonists in N-methyl d-aspartate-induced retinal injury.
Graefes Arch Clin Exp Ophthalmol 2003;
241:418-22. [PMID:
12698253 DOI:
10.1007/s00417-002-0610-8]
[Citation(s) in RCA: 6] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/07/2002] [Revised: 10/22/2002] [Accepted: 11/14/2002] [Indexed: 11/25/2022] Open
Abstract
PURPOSE
To detect the neuroprotective role of nimodipine and dantrolene in N-methyl- d-aspartate (NMDA)-induced retinal injury.
METHODS
In this study we used two calcium antagonists which have two different modes of action, nimodipine and dantrolene, to prevent NMDA-induced retinal ischemia in guinea pigs. In 40 animals we injected nimodipine (n=10), dantrolene (n=10), a combination of both (n=10) or sterile 0.9% NaCl solution as a placebo (n=10) before intravitreal injection of NMDA. We enucleated one eye of each animal after 48 hours and performed histopathologic examination. We also measured malondialdehyde (MDA) levels in retinal homogenates as a marker of ischemic injury.
RESULTS
Our results indicate that ganglion cells of the retina were preserved mostly by nimodipine, followed by combined nimodipine-dantrolene, and dantrolene respectively. The ganglion cell count was statistically significantly higher in cases where we used calcium antagonists than in the control group (p<0.05). We also found that MDA was significantly reduced by calcium antagonists compared to the control group (p<0.05).
CONCLUSION
Our data show that nimodipine and dantrolene both have potential neuroprotective effects; nimodipine preserved retinal ganglion cells to a greater extent than dantrolene from NMDA-induced retinal injury.
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