Hydroxyethyl starch 130/0.4 prevents the early pulmonary inflammatory response and oxidative stress after hemorrhagic shock and resuscitation in rats

Abstract

Background This study was designed to determine the effects of various resuscitation fluids on pulmonary capillary leakage and pulmonary edema after HS and fluid resuscitation (HS/R) and to determine whether an antiinflammatory or antioxidative mechanism was involved. Methods We induced HS by bleeding male Sprague–Dawley rats to a blood pressure of 30 to 40 mm Hg for 60 min. 60 min later, the rats were killed (HS group) or immediately resuscitated with L-isomer lactated Ringer's solution (HS + LR group), shed blood (HS + BL group), or hydroxyethyl starch (HS + HES group) to maintain the blood pressure to the original value during the 60-min resuscitation period. 3 h after resuscitation, pulmonary capillary leakage and wet/dry weight ratio, levels of tumor necrosis factor (TNF)-α, interleukin (IL)-6, malondialdehyde (MDA), oxidized and reduced glutathione (GSH and GSSG), myeloperoxidase (MPO) activity, nuclear factor (NF)-κB, activator protein (AP)-1 activation, and lung microscopic and ultrastructural histological changes were measured. Results HES and BL treatment significantly improved pulmonary capillary leakage, wet/dry weight ratio and lung injuries after HS/R. In addition, both HES and BL could attenuate the increase in TNF-α, IL-6, MPO levels and NF-κB activation. However, HES but not BL could attenuate the increase in MDA level and GSSH/GSH ratio and AP-1 activation. Conclusions HES might attenuate pulmonary injuries by modulating pulmonary inflammatory response and oxidative stress, whereas BL attenuates pulmonary injuries by modulating pulmonary inflammatory response but not oxidative stress.