Protective effects of HBOC on pulmonary vascular leakage after haemorrhagic shock and the underlying mechanisms.

Abstract

Volume resuscitation is an important early treatment for haemorrhagic shock. Haemoglobin-based oxygen carrier (HBOC) can expand the volume and provide oxygen for tissues. Vascular leakage is common complication in the process of haemorrhagic shock and resuscitation. The aim of this study was to observe the effects of HBOC (a bovine-derived, cross-linked tetramer haemoglobin oxygen-carrying solution, 0.5 g/L) on vascular leakage in rats after haemorrhagic shock. A haemorrhagic shock rat model and hypoxic vascular endothelial cells (VECs) were used. The role of intercellular junctions and endothelial glycocalyx in the protective effects of HBOC and the relationship with mitochondrial function were analysed. After haemorrhagic shock, the pulmonary vascular permeability to FITC-BSA, Evans Blue was increased, endothelial glycocalyx was destroyed and the expression of intercellular junction proteins was decreased. After haemorrhagic shock, a small volume of HBOC solution (6 ml/kg) protected pulmonary vascular permeability, increased structural thickness of endothelial glycocalyx, the levels of its components and increased expression levels of the intercellular junction proteins ZO-1, VE-cadherin and occludin. Moreover, HBOC significantly increased oxygen delivery and consumption in rats, improved VEC mitochondrial function and structure. In conclusion, HBOC mitigates endothelial leakage by protecting endothelial glycocalyx and intercellular junctions through improving mitochondrial function and tissue oxygen delivery.

• Authors: Hong Liang Zhao, Jie Zhang, Yu Zhu, Yue Wu, Qing Guang Yan, Xiao Yong Peng, Xin Ming Xiang, Kun Lun Tian, Tao Li, Liang Ming Liu
• Journal: Artificial cells, nanomedicine, and biotechnology (Artif Cells Nanomed Biotechnol) Vol. 48 Issue 1 Pg. 1272-1281 (Dec 2020) ISSN: 2169-141X [Electronic] England
• PMID: 33084450 (Publication Type: Journal Article)

Chemical References

• Blood Substitutes
• Oxygen

Topics

• Animals
• Blood Substitutes (pharmacology)
• Blood Vessels (drug effects, metabolism)
• Endothelial Cells (drug effects, metabolism, pathology)
• Gene Expression Regulation (drug effects)
• Lung (blood supply)
• Male
• Oxygen (metabolism)
• Permeability (drug effects)
• Rats
• Shock, Hemorrhagic (metabolism)