N-(2-mercaptopropionyl)-glycine but not Allopurinol prevented cigarette smoke-induced alveolar enlargement in mouse.

• Autor(a) principal: Pires, Karla Maria Pereira
• Data de Publicação: 2011
• Outros Autores: Bezerra, Frank Silva, Machado, Mariana Nascimento, Zin, Walter Araújo, Porto, Luís Cristovão de Moraes Sobrino, Valença, Samuel dos Santos
• Tipo de documento: Artigo
• Idioma: eng
• Título da fonte: Repositório Institucional da UFOP
• Texto Completo: http://www.repositorio.ufop.br/handle/123456789/2103
• topic: Cigarette; Alveolar space enlargement; Lung inflammation; Oxidative stress

We investigated the possible protective effects of the Allopurinol (A), N-(2-mercaptopropionyl)-glycine (M) and N-acetylcysteine (N) against lung injury caused by long-term exposure to cigarette smoke (CS) in mouse. C57BL6 mice were exposed to 12 cigarettes a day for 60 days and concomitantly treated with either one of the antioxidant drugs diluted in saline (CS + A—50 mg/kg; CS + M—200 mg/kg/day; CS + N—200 mg/kg/day). Control groups were sham-smoked (AA). Long-term CS exposure results in extensive parenchyma destruction in CS group. Both CS + N and CS + M groups showed preserved alveolar structure and showed preserved lung function when compared to CS group. Macrophage and neutrophil counts were decreased in CS + M, and CS + N groups when compared to CS group (p < 0.05). Antioxidant enzyme activities were reduced in all treated groups. CS + A showed the highest reduction in catalase activity (−25%, p < 0.01). We conclude that M treatment reduced long-term CS-induced inflammatory lung parenchyma destruction and lung function, comparable to N treatment, however, antioxidant administration did not reverse CS-induced antioxidant enzyme activity reduction.