Expressions of collagen in lung of rats exposed to ammonium perchlorate / 中华劳动卫生职业病杂志

ABSTRACT

<p><b>OBJECTIVE</b>To study the influence on expression of interstitial collagen in lung of rats exposed to ammonium perchlorate.</p><p><b>METHODS</b>The rats were treated with AP by intratracheal instillation and sacrificed after 3 d, 7 d, 14 d, 28 d. The mRNA level of collagen I and collagen III in the lung tissues was measured by RT-PCR.</p><p><b>RESULTS</b>The levels of collagen I on 7 d, 14 d, 28 d exposed for high dose group (1.93 +/- 0.41, 3.50 +/- 0.90, 2.33 +/- 1.12) and 28 d exposed for medial dose group (2.58 +/- 0.86) were higher significant (P < 0.05) than those in negative control group (0.52 +/- 0.11, 0.77 +/- 0.15, 0.86 +/- 0.29) The levels of collagen I in low dose group exposed for 14 d(1.99 +/- 0.67), 28 d(1.85 +/- 0.67) and high dose group 14 d(3.50 +/- 0.90) exposed for 14 d were higher significant (P < 0.05) compared to those exposed to AP for 3 d(0.52 +/- 0.14), (1.71 +/- 0.38). The levels of collagen III on 14 d, 28 d exposed for high dose group (2.60 +/- 1.00, 1.46 +/- 0.36) and 14 d, 28 d exposed for medial dose group (1.80 +/- 0.51, 2.16 +/- 0.87) were higher significant (P < 0.05 or P < 0.01) than those in negative control group(0.54 +/- 0.20, 0.52 +/- 0.22); The levels of collagen III in medial dose group(2.16 +/- 0.87) exposed for 28 d, and high dose group exposed for 14 d (2.60 +/- 1.00) were higher significant (P < 0.05) compared to those exposed to AP for 3 d(1.22 +/- 0.32, 0.96 +/- 0.17).</p><p><b>CONCLUSION</b>The results suggest that AP has a toxic effect to promote the expressions of collagen I and collagen III mRNA in lungs of rats, and may be cause fibrosis, but there should have more suffice evidences to prove that AP is exactly compound that made lung fibrosis.</p>