Effect of pyruvate peritoneal resuscitation on JAK/STAT signaling pathway in intestinal tissues of rats with hemorrhagic shock

Abstract

Objective To evaluate the effect of pyruvate peritoneal resuscitation on Janus kinase (JAK)/signal transducer and activator of transcription (STAT) signaling pathway in intestinal tissues of rats with hemorrhagic shock. Methods Twenty-four healthy male Sprague-Dawley rats, weighing 200-300 g, were divided into 3 groups (n=8 each) using a random number table method: sham operation group (S group), intravenous resuscitation group (VR group), and peritoneal resuscitation with pyruvate group (PY group). Hemorrhagic shock was induced by blood-letting and infusing blood withdrawn with mean arterial pressure reduced to 30-40 mmHg for 60 min in pentobarbital-anesthetized rats.Hemorrhagic shock was resuscitated with autologous blood and normal saline 2 times the volume of blood withdrawn at the end of hemorrhagic shock in group VR.Pyruvate was intraperitoneally infused for 30 min using a micro-perfusion pump simultaneously with the intravenous resuscitation in group PY.The animals were sacrificed at 2 h after resuscitation, and intestinal tissues were obtained for determination of malondialdehyde (MDA) content (by thiobarbituric acid method), superoxide dismutase (SOD) activity (using xanthine oxidase method), myeloperoxidase (MPO) activity (using chemical colorimetry), and expression of phosphorylated STAT3 (p-STAT3), phosphorylated JAK2 (p-JAK2) and caspase-3 expression (by Western blot). Results Compared with group S, the MDA content and MPO activity were significantly increased, the SOD activity was decreased, and the expression of p-STAT3, p-JAK2 and caspase-3 was up-regulated in the other two groups (P<0.05). Compared with group VR, the MDA content and MPO activity were significantly decreased, the SOD activity was increased, and the expression of p-STAT3, p-JAK2 and caspase-3 was down-regulated in group PY (P<0.05). Conclusion The mechanism by which peritoneal resuscitation with pyruvate mitigates intestinal damage may be related to inhibiting activation of JAK/STAT signaling pathway in the rats with hemorrhagic shock. Key words: Pyruvic acid; Resuscitation; Shock, hemorrhagic; Intestines; Janus kinases; STAT transcription factors