Aminoguanidine reduces oxidative stress and structural lung changes in experimental diabetes mellitus

Abstract

Avaliamos o efeito da aminoguanidina sobre o estresse oxidativo pulmonar e a estrutura pulmonar em um modelo experimental de diabetes mellitus. Foram determinados thiobarbituric acid reactive substances (TBARS, substâncias reativas ao ácido tiobarbitúrico), histologia e gasometria arterial em animais com diabetes mellitus (DM), animais com diabetes mellitus tratados com aminoguanidina (DM+AG) e controles. O nível de TBARS foi significativamente maior no grupo DM que nos grupos controle e DM+AG (2,90 ± 1,12 vs. 1,62 ± 0,28 e 1,68 ± 0,04 nmol/mg proteína, respectivamente), o mesmo ocorrendo com PaCO2 em relação ao grupo controle (49,2 ± 1,65 vs. 38,12 ± 4,85 mmHg), e PaO2 foi significativamente maior no grupo controle (104,5 ± 6,3 vs. 69,48 ±16,30 e 97,05 ± 14,02 mmHg, respectivamente). Neste modelo experimental de diabetes mellitus, a aminoguanidina reduziu o estresse oxidativo, alterações estruturais teciduais pulmonares e a troca gasosa no modelo experimental.

We evaluated the effect of aminoguanidine on pulmonary oxidative stress and lung structure in an experimental model of diabetes mellitus. Thiobarbituric acid reactive substances (TBARS), histology and arterial blood gases were evaluated in animals with diabetes mellitus (DM group), animals with diabetes mellitus treated with aminoguanidine (DM+AG group), and controls. The TBARS levels were significantly higher in the DM group than in the control and DM+AG groups (2.90 ± 1.12 vs. 1.62 ± 0.28 and 1.68 ± 0.04 nmol/mg protein, respectively), as was PaCO2 when compared with that of the control group (49.2 ± 1.65 vs. 38.12 ± 4.85 mmHg), and PaO2 was significantly higher in the control group (104.5 ± 6.3 vs. 16.30 ± 69.48 and 97.05±14.02 mmHg, respectively). In this experimental model of diabetes mellitus, aminoguanidine reduced oxidative stress, structural tissue alterations, and gas exchange.