THE ROLE OF ADRENOCORTICAL HORMONES IN THE REGULATION OF ORGANISM RESPONSE TO INTRATRACHEAL INJECTIONS OF ELECTROLYSIS DUST TO WISTAR RATS
Introduction. Adrenocortical hormones play a leading role in the adaptation of human organism to damaging factors. The aim of this study is to compare levels of cortisol and biochemical markers of organism damage (MOD) in blood samples of rats under a model of electrolysis dust (ED) inhalation exposure. ED being component of emissions in aluminum production and has high content of resinous substances (RS), including 3,4-benzpyrene. Material and methods. Male Wistar rats were injected ED intratracheally once per month, in doses corresponding to keeping of animals at ED concentrations of 1.0; 5.2 and 25.1 mg/m3, calculated on RS mass. 2 weeks after the 1st and 2nd ED administration and 6 days after the 3rd one, blood serum samples were used for determination of cortisol levels (ELISA) and the following 6 MOD: the intensity of luminol-enchanced chemiluminescence, activities of catalase, N-acetyl-β-D-glucosaminidase (NAG), acid DNAse, acetylesterase and γ-glutamyl transferase (GGT). Results. 2 weeks after the 1st and 2nd ED administrations (cortisol content 2 times reduced or not changed), similar significant changes were observed in almost all MOD; 2nd experimental point, if comparing with 1st point, had slight increase in oxidative stress and significant rise in GGT activity (a marker of precancer changes) at the maximum dose. On the contrary, 6 days after the 3rd injection of ED, in parallel with the increase of cortisol content in rat blood by 1.5 - 2 times, small significant changes were found for only one marker (NAG). The obtained data fit into existing concepts about protective role of cortisol and biphasic nature of its release into the blood, allow us to consider the absence of MOD, in parallel with rising levels of C, as a transit phase and have common problem aspects with CIRCI syndrome (Critical illness-Related Corticosteroid Insufficiency) in emergency medicine. Conclusion. Determination of cortisol levels by ELISA assay can be easily incorporated into any toxicological protocol as index of organism adaptive response, but further investigations are needed to clarify its characteristics and to build continuous model from separate time-dose points.
About the authorsKhripach Ludmila V.
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