Tag Archives: aspartate aminotransferase

ТiО(2) hepatotoxicity under long-term administration to rats

O. V. Tsymbalyuk, S. P. Veselsky, A. M. Naumenko, T. L. Davydovska,
I. S. Voiteshenko, I. I. Сhyzh, V. A. Skryshevsky

Institute of High Technologies, Taras Shevchenko National University of Kyiv, Ukraine;
e-mail: otsymbal@bigmir.net

Received: 30 March 2020; Accepted: 15 May 2020

Titanium dioxide (ТіО2) powder which is used as a white dye was  considered to be an inert material for a long time despite its accumulation  in liver tissues after penetration into  organism. The aim of the study was to estimate biochemical markers of liver functioning in blood plasma and ATPase activity of erythrocyte plasma membrane under the oral administration of ТіО2 nanoparticles suspension (0.1 mg/kg, daily) to Wistar rats for 30 and 100 days. A significant increase of alanine aminotransferase and aspartate aminotransferase activity as well as of direct, indirect and bound bilirubin content, a decrease of connjugated (taurocholic, taurochenodeoxycholic, taurodeoxycholic, glycocholic, glycochenodeoxycholic, and glycodeoxycholic) and free (glycodeoxycholic and deoxycholic) bile acids concentration with concomitant increase of free cholic acid concentration in blood plasma of rats under ТіО2 administration were revealed, indicating a significant impairment of pigment exchange in the liver of rats. Under ТіО2 administration a substantial  inhibition of erythrocyte plasma membrane Мg2+-dependent ouabain-sensitive Na+,K+-ATPase and ouabain-insensitive ATPase was observed. These results presume the disturbance of transplasmalema ion-transporting processes and cells ionic homeostasis  induced by ТіО2.

Comparison of blood biochemical indices in rats exposed to lead in macrodispersed form and nanoform

 I. A. Lazarenko, N. M. Melnikova

National University of Life and Environmental Sciences of Ukraine, Kyiv;
e-mail: ilazarenko2009@yandex.ru

It is shown that the increasing content of lead in blood (6.3 and 3.7 times) and liver (30.1 and 4.6 times) in rats after 14-days per os exposure both to lead acetate (macrodispersed form) and lead nanoparticles (nanoform) in a dose of 7 mg/100 g of body weight leads to the increased of activity of blood enzymes: alanine aminotransferase, aspartate aminotransferase, γ-glutamyltransferase, alkaline phosphatase, lactate dehydrogenase and a decrease of creatinine level. Lead in nanoform with slight accumulation, due to the greater elimination, expressed higher biological activity and reactivity as compared to macrodispersed form. Thus the exposure to lead in different dispersed form suggests metabolic disorders in rats, and accumulation of lead and biochemical changes are more expressed in the liver.