Is cardiac tissue more susceptible than lung to oxidative effects induced by chronic nasotropic instillation of residual oil fly ash (ROFA)?

Toxicology Mechanisms and Methods
Roberto Marques DamianiCláudia Ramos Rhoden

Abstract

The current study aimed to determine the role of oxidants in cardiac and pulmonary toxicities induced by chronic exposure to ROFA. Eighty Wistar rats were divided into four groups: G1 (10 µL Saline), G2 (ROFA 50 µg/10 µL), G3 (ROFA 250 µg/10 µL) and G4 (ROFA 500 µg/10 µL). Rats received ROFA by nasotropic instillation for 90 days. After that, they were euthanized and bronchoalveolar lavage (BAL) was performed for total count of leukocytes, protein and lactate dehydrogenase (LDH) determinations. Lungs and heart were removed to measure lipid peroxidation (MDA), catalase (CAT) and superoxide dismutase (SOD) activity. BAL presented an increase in leukocytes count in G4 in comparison to the Saline group (p = 0.019). In lung, MDA level was not modified by ROFA, while CAT was higher in G4 when compared to all other groups (p = 0.013). In heart, G4 presented an increase in MDA (p = 0.016) and CAT (p = 0.027) levels in comparison to G1. The present study demonstrated cardiopulmonary oxidative changes after a chronic ROFA exposure. More specifically, the heart tissue seems to be more susceptible to oxidative effects of long-term exposure to ROFA than the lung.

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Citations

May 20, 2018·Redox Report : Communications in Free Radical Research·Bruna MarmettCláudia Ramos Rhoden
Sep 22, 2018·Journal of Toxicology and Environmental Health. Part a·Melisa L KurtzDeborah R Tasat
Nov 1, 2018·American Journal of Physiology. Heart and Circulatory Physiology·Shama AhmadLouis J Dell'Italia
Jan 15, 2021·Environmental Science and Pollution Research International·Lílian Corrêa Costa-BeberMirna Stela Ludwig

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