[Molecular biologic study on heme oxygenase in experiment pulmonary thromboembolism].
OBJECTIVE
To investigate the changes in heme oxygenase (HO) system expression in pulmonary thromboembolism (PTE), and the influence to the pulmonary artery blood pressure as a result of the changes.


METHODS
In 23 healthy adult male dogs, autologous thrombus was injected through the jugular vein to reproduce the PTE model. They were divided randomly into 4 groups: A (pulmonary embolism 3 hours group), B (pulmonary embolism 8 hours group), C (pulmonary embolism 24 hours group) and D (control group). Swan-Ganz catheter was placed via the femoral vein to observe the changes in hemodynamics. Pulmonary artery was obtained to detect the expression of HO-1 using semi-quantity reverse transcription-polymerase chain reaction (RT-PCR) and immunohistochemical method.


RESULTS
The pulmonary artery mean pressure (PAMP), pulmonary artery systolic pressure (PASP) and pulmonary artery diastolic pressure (PADP) of the experimental groups were increased obviously after the pulmonary embolism as compared with those of before the embolism (all P<0.05), and were decreased obviously 1 hour after the embolism (all P<0.05). The decrease was gradual and stopped after 4-5 hours, but the pressure 8 hours after embolism was still higher than that of before embolism. HO-1 was not expressed in pulmonary artery in control group, but expressed after embolism in each experimental group. The expression was increased gradually after pulmonary embolism, and it was remarkable 24 hours after embolism (all P<0.05).


CONCLUSIONS
The expression of HO-1 increased in PTE, and the increased pulmonary artery blood pressure decreased at the same time. The results suggest that HO-1 is related with dilatation of pulmonary artery after PTE.
Zhao
Ming-yan
MY
Department of Critical Care Medicine, the First Clinical Hospital of Harbin Medical University, Harbin, Heilongjiang, China. mingyan1970@126.com
Luo
Yun-peng
YP
Fei
Dong-sheng
DS
Huang
Yong-lin
YL
D000818:Animals; D001794:Blood Pressure / Q000502:physiology; D004195:Disease Models, Animal; D004285:Dogs; D051547:Heme Oxygenase-1 / Q000378:metabolism*; D008297:Male; D011651:Pulmonary Artery / Q000201:enzymology* / Q000503:physiopathology; D011655:Pulmonary Embolism / Q000201:enzymology*; D011897:Random Allocation
D051547:Heme Oxygenase-1