[Changes of thromboxane A2 receptors and their mRNA expression and effects of their antagonist phenol red in the lung of acute lung injury of rats].
OBJECTIVE
To investigate the changes of thromboxane A2 receptors and the influence of their antagonist phenol red, and to study in molecular level the mechanism of action of thromboxane A2 in acute lung injury.


METHODS
Acute lung injury model of rats was produced by oleic acid, and phenol red (5 mg/kg, 50 mg/kg) was injected via vein 5 minutes before oleic acid injection. Changes of thromboxane A2 receptors and their mRNA expression in the lung were determined at 6 hours after oleic acid injection.


RESULTS
Down-regulation of thromboxane A2 receptors were observed, but their mRNA transcription increased significantly in the lung after oleic acid injection. The injection of phenol red before oleic acid could induce down-regulation of thromboxane A2 receptors and abolish the increase of their mRNA transcription after oleic acid injection. Phenol red could reduce LBI, RLW and improve PaO2. Histological examination of lung tissues demonstrated that the degree of lung injury had been reduced significantly.


CONCLUSIONS
Thromboxane A2 plays an important role plays in pathological processes of acute lung injury. Phenol red in vivo could effectively reduce severity of acute lung injury by blocking thromboxane A2 receptors and regulating the expression of thromboxane A2 receptors.
Feng
G
G
Research Institute of Surgery, Daping Hospital, Chongqing 400042.
Zhou
Y
Y
Yang
Z
Z
D000818:Animals; D005260:Female; D008168:Lung / Q000378:metabolism*; D008297:Male; D019301:Oleic Acid; D010637:Phenolsulfonphthalein / Q000494:pharmacology*; D012333:RNA, Messenger / Q000096:biosynthesis / Q000235:genetics; D011897:Random Allocation; D051381:Rats; D017208:Rats, Wistar; D017482:Receptors, Thromboxane / Q000037:antagonists & inhibitors / Q000096:biosynthesis* / Q000235:genetics; D012128:Respiratory Distress Syndrome / Q000139:chemically induced / Q000378:metabolism*
D012333:RNA, Messenger; D017482:Receptors, Thromboxane; D019301:Oleic Acid; D010637:Phenolsulfonphthalein