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Vol. 46. Issue 1.
Pages 20-26 (January 2010)
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Vol. 46. Issue 1.
Pages 20-26 (January 2010)
Original Article
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Liver Growth Factor Improves Pulmonary Fibrosis Secondary to Cadmium Administration in Rats
El factor de crecimiento de hígado mejora la fibrosis pulmonar inducida tras la administración de cadmio en ratas
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Lourdes Martínez-Galána, Laura del Puerto-Nevadoa,
Corresponding author
lpuerto@fjd.es

Corresponding author.
, Sandra Pérez-Riala, Juan José Díaz-Gilb, Nicolás González-Mangadoa, Germán Peces-Barbaa
a Laboratorio de Neumología Experimental, Fundación Jiménez Díaz–CAPIO, CIBERES, Madrid, Spain
b Servicio de Bioquímica Experimental, Hospital Puerta de Hierro, Madrid, Spain
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Abstract
Introduction

Liver growth factor (LGF) is a liver mitogen with regenerating and anti-fibrotic activity even at extrahepatic sites. We used LGF in a lung fibrosis model induced by cadmium chloride (CdCl2), to study its antifibrotic capacity.

Methods

Forty-two male Wistar rats were administered a single dose of 0.5ml/rat of CdCl2 0.025% (n=21) or the same volume of saline (control group, n=21). After 35 days, once a lesion was established, we started a 3 week treatment with LGF, after which we determined lung function ––inspiratory capacity (IC), lung compliance (LC), forced vital capacity (FVC) and expiratory flow at 75% (FEF75%)––, lung morphometry ––alveolar internal area (AIA), mean linear intersection (LM)––, and collagen (both by Sirius red and hydroxyproline residues) and elastin contents.

Results

Pulmonary fibrosis in CdCl2 rats was characterized by a marked decrease in pulmonary function with respect to healthy controls ––reductions of 28% in IC, 38% in CL, 31% in FVC, and 54% in FEF75%–– which was partially recovered after LGF injection ––18% IC, 27% CL, 19% FVC and 35% FEF75%––; increase in collagen and elastin contents ––165% and 76%, respectively, in CdCl2 rats, versus 110% and 34% after LGF injection––; and increases in AIA and LM, partially inverted by LGF.

Conclusions

Together, these data seem to demonstrate that LGF is able to improve lung function and partially inverts the increase in lung matrix proteins produced by CdCl2 instillation.

Keywords:
Liver growth factor
Fibrosis
Lung function
Lung morphometry
Collagen
Resumen
Introducción

El liver growth factor (LGF, ‘factor de crecimiento de hígado’) es un mitógeno con actividad regeneradora y antifibrótica con actividad incluso en localizaciones extrahepáticas. En este trabajo se administró LGF en un modelo de fibrosis pulmonar inducido con cloruro de cadmio (CdCl2) para estudiar su capacidad antifibrótica.

Métodos

Se instilaron 42 ratas Wistar macho con 0,5ml/rata de CdCl2 al 0,025% (n=21) o de salino (n=21). Transcurridos 35 días y una vez establecida la lesión se realizó el tratamiento con LGF y posteriormente el análisis de los parámetros funcionales ––capacidad inspiratoria (CI), complianza pulmonar (CL), capacidad vital forzada (CVF) y flujo espiratorio forzado al 75% (FEF75%)––, morfometría ––área interna alveolar y distancia media entre paredes alveolares–– y contenido en colágeno y elastina.

Resultados

La fibrosis pulmonar originada mediante CdCl2 se caracterizó por un marcado descenso de la función pulmonar en comparación con los controles. Se redujó un 28% la CI, un 38% la CL, un 31% la CVF y un 54% la FEF75%, descenso que se revirtió parcialmente tras la inyección de LGF ––el 18% en CI, el 27% en CL, el 19% en CVF y el 35% en FEF75%––. Además, se observó un incremento en la cantidad de colágeno y elastina del 165 y el 76%, respectivamente, en las ratas del grupo CdCl2 frente a un 110 y un 34% tras la inyección de LGF.

Conclusiones

Estos datos demuestran que el LGF mejora la función pulmonar y revierte parcialmente el incremento de las proteínas de matriz pulmonar producido por la instilación con CdCl2.

Palabras clave:
Factor de crecimiento de hígado
Fibrosis
Función pulmonar
Morfometría pulmonar
Colágeno
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