1. Experimental research in rats on the reactivity of new corneal blood vessels to adrenaline
- Author
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Cristina Coman Ioana, Mihai Ghiță Aurelian, Bianca Damian Daniela, and Istrate Sânziana
- Subjects
medicine.medical_specialty ,Epinephrine ,Adrenergic receptor ,Vasodilation ,Constriction ,Cornea ,Neovascularization ,Ophthalmology ,medicine ,Animals ,Vasoconstrictor Agents ,Rats, Wistar ,Receptor ,new blood vessels ,adrenaline ,business.industry ,General Medicine ,medicine.disease ,eye diseases ,Rats ,Receptors, Adrenergic ,medicine.anatomical_structure ,Vasoconstriction ,Models, Animal ,Corneal neovascularization ,sense organs ,medicine.symptom ,General Articles ,business - Abstract
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.
- Published
- 2021