Experimental research in rats on the reactivity of new corneal blood vessels to adrenaline.

Autor:	Daniela BD; Department of Ophthalmology, 'Dr. Alexandru Popescu' Military Emergency Hospital Focșani, Focșani, Vrancea, Romania., Aurelian MG; Department of Physiology, 'Carol Davila' University of Medicine and Pharmacy, Bucharest, Romania., Sânziana I; Department of Ophthalmology, 'Carol Davila' University of Medicine and Pharmacy, Bucharest, Romania., Ioana CC; Department of Ophthalmology, 'Carol Davila' University of Medicine and Pharmacy, Bucharest, Romania.
Jazyk:	angličtina
Zdroj:	Romanian journal of ophthalmology [Rom J Ophthalmol] 2021 Jan-Mar; Vol. 65 (1), pp. 64-69.
DOI:	10.22336/rjo.2021.12
Abstrakt:	Aim: The purpose of this experimental study was to evaluate the existence of adrenergic receptors in ketamine-induced corneal blood vessels in rat pups. Methods: The study of corneal neovascularization motricity was performed on 45-day-old Wistar rats in which, starting from the 15th day of life, corneal blood vessels were obtained by injecting intraperitoneal ketamine at a dose of 150 mg/ kg body weight, a total of 5 successive doses. The examination of the neovascularization was done with the help of a Nikon stereomicroscope connected to a video camera and a computer, the total magnification being 400X. The reactivity of the new corneal blood vessels to the administration in conjunctival instillations of a 1.5 mmol/L adrenaline solution was tested. The parameters followed were represented by variations in the caliber of corneal blood vessels. The data were analyzed using Microsoft Office Excel. Results: Administration of distilled water did not produce statistically significant changes in corneal blood vessels, while adrenaline produced a statistically significant constriction of vascular diameter (p=0.01 at T9, p=0.004 at T10, p=0.019 at time T11 of examinations). Conclusions: The results showed that adrenaline produces vasoconstriction in the new corneal blood vessels, which allows us to assume that they contain α-adrenergic receptors. However, we cannot say that corneal pathological vessels do not contain β2-type adrenergic receptors, because the effect of adrenaline may be an algebraic sum between vasoconstriction produced by stimulating α-adrenergic receptors and vasodilation produced by stimulating β2-adrenergic receptors, but in which the vasodilating effect may be masked by the vasoconstrictor effect given by a higher density of α-adrenergic receptors. Abbreviations: A= adrenaline, DNM = non-measurable diameter, NA= noradrenaline, Std.Er.= Standard error. (©Romanian Society of Ophthalmology.)
Databáze:	MEDLINE
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