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Nitric oxide and octreotide in retinal ischemia–reperfusion injury*

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Abstract

This experimental study was performed to investigate the role of ischemia–reperfusion injury on retinal nitric oxide activity and to determine whether octreotide, the synthetic analogue of natural somatostatin, modifies the nitric oxide activity during retinal ischemia–reperfusion in a quinea pig model. Three groups of seven pigmented male quinea pigs were formed; Control, Ischemia and the Ischemia/Octreotide groups. 90 minutes of pressure-induced retinal ischemia and 24 h of reperfusion were established in the ischemia and ischemia/octreotide groups. Saline for the ischemia group and 50 μg/kg of octreotide for the ischemia/octreotide group were administered intraperitoneally five times with 6-h intervals. At the end of the reperfusion period both eyes of the animals of the three groups were enucleated. One eye of each animal was randomly selected for biochemical assay and the other for histopathological analysis. Retinal nitrate levels were measured and histopathological changes were evaluated in the groups. The mean retinal nitrate levels of the control, ischemia and ischemia/octreotide groups were 157.6±25.2, 106.4±20.1 and 96.4±17.7 μmol/l, respectively. Nitrate levels decreased significantly both in the ischemia (p<0.01) and ischemia/octreotide (p<0.01) groups versus control. In the ischemia group, retinal histopathological changes, which were different from the control group, were prominent edema, polymorphonucleated leukocytes infiltration and vacuolated spaces in the inner retina. No significant change was observed in the histopathological specimens of the ischemia/octreotide group. Significant increase in the thickness of the inner plexiform layer of the retina of the ischemia group was observed versus the control and ischemia/octreotide groups (p<0.01 and p<0.01, respectively).The thickness of the inner plexiform layer of the retina of the ischemia/octreotide group did not change versus the control group. It was concluded that nitric oxide activity decreased during retinal ischemia–reperfusion and, although octreotide prevented the histopathological damage, it could not ameliorate the nitric oxide activity of the retina.

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Authors and Affiliations

  1. Departments of Ophthalmology and, Turkey

    Ulku Celiker & Necip Ilhan

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  1. Ulku Celiker
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  2. Necip Ilhan
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This study was presented in part at the 23rd Congress of the European Society of Ophthalmology.

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Celiker, U., Ilhan, N. Nitric oxide and octreotide in retinal ischemia–reperfusion injury* . Doc Ophthalmol 105, 327–338 (2002). https://doi.org/10.1023/A:1021243126512

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