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http://hdl.handle.net/11154/1789
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Title: | Bleomycin-induced pulmonary fibrosis is attenuated in gamma-glutamyl transpeptidase-deficient mice |
Authors: | Ruiz, V Arreola, JL Ramirez, R Cisneros-Lira, J Gaxiola, M BarRíos, R Kala, SV Lieberman, MW Selman, M Pardo-Cemo, Annie |
Issue Date: | 2003 |
Abstract: | To investigate repair mechanisms in bleomycin-induced pulmonary fibrosis, we used mice deficient in gamma-glutamyl transpeptidase (GGT(-/-)), a key enzyme in glutathione (GSH) and cysteine metabolism. Seventy-two hours after bleomycin (0.03 U/g), GGT-/- mice displayed a different inflammatory response to wild-type mice as judged by a near absence of neutrophils in lung tissue and bronchoalveolar lavage and a less pronounced rise in matrix metalloproteinase-9. Inflammation in GGT(-/-) mice consisted mainly of lymphocytes and macrophages. At 1 month, lungs from bleomycin-treated GGT(-/-) mice exhibited minimal areas of fibrosis compared with wild-type mice(light microscopy fibrosis index: 510 +/- 756 versus 1975 +/- 817, p < 0.01). Lung Collagen content revealed a significant increase in bleomycin-treated wild-type (15.1 +/- 3.8 versus 8.5 +/- 0.7 mug hydroxy(OH)-proline/mg dry weight, p < 0.01) but not in GGT(-/-)(10.4 +/- 1.7 versus 8.8 +/- 0.8). Control lungs from GGT(-/-) showed a significant reduction of cysteine (0.03 +/- 0.005 versus 0.055 +/- 0.001, p < 0.02) and GSH levels (1.24 +/- 0.055 versus 1.79 +/- 0.065, p < 0.002). These values decreased after 72 hours of bleomycin in both GGT-/- and wild-type but reached their respective control values after I month. Supplementation with N-acetyl cysteine partially ameliorated the effects of GGT deficiency. These findings suggest that increased neutrophils and matrix metalloproteinase-9 during the early inflammatory response and adequate thiol reserves are key elements in the fibrotic response after bleomycin-induced pulmonary injury. |
URI: | http://hdl.handle.net/11154/1789 |
ISSN: | 1073449X |
Appears in Collections: | Departamento de Biología Celular
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