Peculiarities of metabolites changes of nitrogen (ІІ) oxide and endothelin-1 in acute lung injury in experiment
DOI:
https://doi.org/10.11603/mcch.2410-681X.2018.v0.i2.9132Keywords:
acute lung injury, nitric oxide, endothelin 1.Abstract
Introduction. Structural damage to the alveoli is observed when acute lung injury (ALI) and acute respiratory distress syndrome (ARDS), which develops within hours and days after the end of the primary damaging factor. Pulmonary epithelium is an important component in the mechanisms of development and course of ALI/ ARDS. This justifies the research of new mechanisms of the influence of damaging factors on the pulmonary tissue and the organism of ARDS patients.
The aim of the study – to learn the content of metabolites of nitrogen (II) oxide and the concentration of endothelin-1 in the lung tissues and to justify their role in the pathogenesis of acute lung injury in the experiment.
Research Methods. Experiments were conducted on 54 white nonlinear male-rats, which were modulated acute lung injury by intratracheal administration of hydrochloric acid at pH 1.2 at a dose of 1.0 ml/kg per breath. The content of nitrite anion was determined in homogenates of lung tissues by spectrophotometric method, the level of endothelin-1 by the enzyme immunoassay method.
Results and Discussion. Analysis of the nitrite anion in the lungs of rats with ALI indicates a sharp increase in the index under study after 12 hours of experiment, which lasts until the end of the day. It was noted that after 2 and 6 hours, the level of NO2 - increased by 20.38 % and 40.76 %, respectively, compared with the control (p <0.001). In the fourth research group, the nitrite anion content increases by 2.43 times, in relation to the 3rd test group, and by more than three times as compared with the results of the control. It should be noted that in determining endothelin 1 at 2 and 6 hours, its level increases by 17.43 % and 75.68 %, respectively, compared with the control (p <0.001).
In the 4th study group, the endothelin 1 concentration increased 1.52 times compared to the 3rd experimental group and 2.67 times compared to the control group.
Conclusions. In experimental acute lung injury, activation of nitroxidergic processes occurs due to a significant increase in nitrogen oxide metabolites in the lung homogenate. Acute lung damage in rats is accompanied by an increase in the level of endothelin-1 in the lung homogenate with the highest values after 24 hours of observation.
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