Prognostic Value Estimation of Monoamines Systemic Level in Retinopathy of Prematurity in Experiment.

L.A Katargina,Yu.O Nikishina,M.V Ugrumov,A.R Murtazina,N.A Osipova,N.S Bondarenko,A.Y Panova

doi:10.17691/stm2021.13.3.05

L.A Katargina, Yu.O Nikishina + Show 5 more

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https://doi.org/10.17691/stm2021.13.3.05

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Abstract

The aim of the investigation was to study a systemic level of L-DOPA, dopamine, and norepinephrine, and assess their prognostic value in retinopathy of prematurity (ROP) development on an experimental disease model.Materials and MethodsThe investigation was carried out on infant Wistar rats (n=36) divided into a study group (rat infants with experimental ROP, n=17) and a control group (n=19). The animals of both groups were sacrificed on days 14, 21–23, and on days 28–30. The choice of the indicated periods corresponded to the key stages of ROP development in an experiment and was based on the findings of our previous histological studies. Dopamine, L-DOPA, and norepinephrine levels in infant rat blood plasma samples were determined.ResultsOn day 14 of the experiment (the period corresponds to the pathological neovascularization induction in the applied model and preclinical ROP in children), mean L-DOPA level in infant rats with ROP (0.31 ng/ml) was significantly decreased compared to that in the controls (0.42 ng/ml) (p≤0.01). On days 21–23 of the experiment (the period corresponds to the growth of pathological extraretinal neovascularization in the applied model and ROP stage 3 in children) the systemic level of L-DOPA was still statistically reduced in the study group (0.87 ng/ml) compared to the control group (1.53 ng/ml) (p≤0.01). On days 28–30 of the experiment (the period corresponds to the regress of neovasculature in the applied model and a spontaneous ROP regress stage in children) the L-DOPA level in blood plasma in the study group (0.33 ng/ml) showed an insignificant upward tendency in reference to the controls (0.21 ng/ml). Mean dopamine and norepinephrine levels had no difference in the groups under study of infant rats within all follow-up periods.ConclusionLow systemic level of L-DOPA at the preclinical stage of experimental ROP should be considered as a laboratory prognostic criterion of a developing pathological process; it will enable to use the criterion when working out the measures to optimize the existing screening system for the disease in children.

Highlights

Retinopathy of prematurity (ROP) is a severe vasoproliferative vitreoretinal eye pathology in premature children
On days 21–23 of the experiment the systemic level of L-DOPA was still statistically reduced in the study group (0.87 ng/ml) compared to the control group (1.53 ng/ml) (p≤0.01)
On days 28–30 of the experiment the L-DOPA level in blood plasma in the study group (0.33 ng/ml) showed an insignificant upward tendency in reference to the controls (0.21 ng/ml)

Summary

Introduction

Retinopathy of prematurity (ROP) is a severe vasoproliferative vitreoretinal eye pathology in premature children It is one of the primary causes of irreversible bilateral impairment of visual functions in children [1]. On ocular fundus of premature children in the norm, there are always found avascular zones on retinal periphery, they extend all the more, the less the child’s gestational age at the moment of examination. The presence of such avascular zones is not a disease: it is the evidence of retinal hypoplasia, its incomplete vascularization, and, the possibility of ROP development at a later stage. Predictability of the disease onset right at this stage is of great clinical relevance

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