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The relations between mRNA expression of basic fibroblast growth factor (bFGF) and the changes in collagen Ⅰand collagen Ⅲ in pulmonary tissues from a single intratracheal instillation of papain induced emphysema in rats were investigated. Wistar rats ( n =42) were randomly divided into normal group and emphysema model 1, 3, 5, 7, 15, 30 day groups ( n =6 in each group). The rat model of emphysema was induced by a single intratracheal instillation of papain. The results of immunohistochemistry SABC and in situ hybridization with bFGF probe were quantitatively analyzed to examine the changes of collagen Ⅰand collagen Ⅲ and bFGF mRNA expression in lung tissues and the percent of positive expression of bFGFmRNA in alveolar macrophages. The results were as follows: (1) In the emphysema model groups the optical densities of collagen Ⅰand collagen Ⅲ began to increase after 3 days, reached the highest at the 7 th day, and began to reduce at the 15 th day; (2) No expression of bFGFmRNA in pulmonary tissues was detectable in the normal group. The positive expression of bFGFmRNA was detectable in lung tissues one day after the intratracheal instillation of papain. The average optical densities reached the peak (41.895±7.017) at the 7th day, significantly higher than in the normal group (0.581±0.139, P <0.01). The positive expression of bFGFmRNA in lung tissues began to reduce at the 15th day; (3) Positive expression of bFGFmRNA in alveolar macrophages of instillation papain rats was detectable 3 days after the intratracheal instillation of papain, and reached the highest at the 7th day with the percent of positive expression of bFGF mRNA in alveolar macrophages being 70.13±11.21, higher than in the normal group (5.12±0.18, P <0.01); (4) The expression of bFGF mRNA in the lung tissues and macrophages was postively related with the changes in collagen Ⅰ and collagen Ⅲ ( P <0.01 or P <0.05) respectively. It was suggested that the up regulation of bFGF mRNA expression during the development of emphysema can lead pulmonary interstitial fibrosis, which may take part in the injury and repair and the lung tissue reconstruction.
The relations between mRNA expression of basic fibroblast growth factor (bFGF) and the changes in collagen I and collagen III in pulmonary tissues from a single intratracheal instillation of papain induced emphysema in rats were investigated. Wistar rats (n = 42) were randomly divided into normal The rat model of emphysema was induced by a single intratracheal instillation of papain. The results of immunohistochemistry SABC and in situ hybridization (n = 6 in each group) with bFGF probe were quantitatively analyzed to examine the changes in collagen I and collagen III and bFGF mRNA expression in lung tissues and the percent of positive expression of bFGF mRNA in alveolar macrophages. (1) In the emphysema model groups the the optical densities of collagen Ⅰand collagen Ⅲ began to increase after 3 days, reached the highest at the 7th day, and began to reduce at the 15th day; (2) No ex The positive expression of bFGF mRNA was detectable in lung tissues one day after the intratracheal instillation of papain. (41.895 ± 7.017) at the 7th day, the positive expression of bFGF mRNA was detectable in lung tissues one day after the intratracheal instillation of papain. Positive expression of bFGF mRNA in alveolar macrophages of instillation papain rats was detectable for 3 days (0.581 ± 0.139, P <0.01). after the intratracheal instillation of papain, and reached the highest at the 7th day with the percent of positive expression of bFGF mRNA in alveolar macrophages being 70.13 ± 11.21, higher than in the normal group (5.12 ± 0.18, P <0.01); (4 ) The expression of bFGF mRNA in the lung tissues and macrophages was postively related with the changes in collagen Ⅰ and collagen Ⅲ respectively (P <0.01 or P <0.05) respectively. It was suggested that the u p regulation of bFGF mRNA expression during the development of emphysema can lead pulmonary interstitial fibrosis, which may take part in the injury and repair and the lung tissue reconstruction.