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Updated: Jul 15, 2026
A Reproducible Intensive Care Unit-Oriented Endotoxin Model in Rats
Published on: February 20, 2021
[Effect of ketamine on endotoxin-induced septic shock in rats and its mechanism]
Hong Xiao1, Hong-wei Xu, Hui Liu
1Department of Anesthesiology, West China Hospital, Sichuan University, Chengdu 610041, Sichuan, China. xiaohong70@yahoo.com
Objective:
To explore the effect of ketamine on septic shock in rat and its mechanism.
Methods:
Sixty SD rats were randomly divided into control group, model group and ketamine group. Septic shock was replicated by intraperitoneal injection of 20 mg/kg lipopolysaccharide (LPS). Control group was given normal saline only. In ketamine group, the rats received intraperitoneal injection of 80 mg/kg ketamine 20 minutes before shock and 1 hour (ketamine 40 mg/kg) after shock. The survival time and survival rate were observed in each group. Serum tumor necrosis factor-alpha (TNF-alpha), myocardiac cyclic adenosine monophosphate (cAMP) were determined with radioimmunology assay, and expression of heat shock protein 70 (HSP70) was assessed by immunohistochemistry method.
Results:
The survival rate was lower in model group (0) compared with control group (100%) and ketamine group (70%), the differences were significant (both P<0.05). TNF-alpha was higher, while cAMP was lower in model group compared with control group and ketamine group (all P<0.01). Positive expression of HSP70 in model group was lower than control group, while higher than ketamine group (both P<0.01). There were no significant differences in TNF-alpha and cAMP between control group and ketamine group (both P>0.05).
Conclusion:
Serum TNF-alpha is increased and myocardiac cAMP is decreased in LPS-induced septic shock, whereas ketamine can inhibit the effect of LPS and protect myocardium against sepsis probably by stimulating the expression of myocardiac HSP70.
