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Published on: August 14, 2017
Unfractionated heparin attenuated histone-induced pulmonary endothelial glycocalyx injury through Ang/Tie2 pathway
Jia Yin1, Yawen Chi1, Danyan Liu1
1Department of Critical Care Medicine, The First Affiliated Hospital, China Medical University, North Nanjing Street 155, Shenyang, Liaoning, 110001, China.
Purpose:
This study aimed to investigate the involvement of angiopoietin (Ang)/Tie2 pathway in mediating pulmonary endothelial glycocalyx injury in histone-induced acute lung injury in mice, and the protective mechanism of unfractionated heparin (UFH).
Methods:
Twenty-four male C57BL/6 mice (20-25 g), 8-12 weeks old, were randomly divided into control, histone, and histone + UFH groups. The histone (50 mg/kg) was administered via tail vein. UFH (400 U/kg) was administered 1 h after histone injection. The control group was administered by an equal amount of sterile saline solution. The lungs of all groups were harvested 4 h after the injection of histones or sterile saline.
Results:
UFH attenuated histone-induced lung histopathological changes and edema. UFH alleviated pulmonary endothelial injury and glycocalyx shedding by reducing histone-induced low expression of thrombomodulin (TM) and decreased lung syndecan-1 levels. UFH improved histone-induced low mRNA expression of TM, syndecan-1, Ang-1, Tie2 and high expression of heparinase (HPA), Ang-2.
Conclusion:
UFH may attenuate histone-induced lung injury and pulmonary endothelial glycocalyx degradation via the Ang/Tie2 pathway.
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