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[Preventive effects of montelukast on the collagen expression of pulmonary arterioles in rats with chronic hypoxia].

OBJECTIVE
To evaluate the preventive effects of montelukast on the collagen expression of pulmonary arterioles in chronic hypoxic rats.


METHODS
Thirty male Wistar rats were randomly divided into three groups: control group, hypoxic group and montelukast preventive group. The animal model of pulmonary hypertension was established by exposing the rats to normabaric hypoxic conditions 8 hours q.d. for 3 weeks. The expression levels of collagen I and III in arterioles were observed by immunohistochemistry.


RESULTS
The positive degree of collagen I in pulmonary arterioles of hypoxic group was higher than that of control group (1.51+/-0.09 vs 1.15+/-0.05, P<0.01), and the positive degree of collagen I in pulmonary arterioles of preventive group (1.19+/-0.06) was lower than that of hypoxic group (P<0.01). The differences of positive degree of collagen III in pulmonary arterioles were not significant among the three groups (P>0.05).


CONCLUSION
Montelukast can reduce the hypoxia-induced deposition of collagen I in the pulmonary arterioles wall.