Related Experiment Video
Updated: Aug 19, 2026
Intravenous Endotoxin Challenge in Healthy Humans: An Experimental Platform to Investigate and Modulate Systemic Inflammation
Published on: May 16, 2016
Suppression by methylprednisolone of augmented plasma endotoxin-like activity and interleukin-6 during
1Department of Anaesthesiology, Chiba University School of Medicine, Japan.
Abstract:
It has been reported that plasma endotoxin, measured by Limulus amoebocyte lysate assays, markedly increased during extracorporeal circulation (ECC). Therefore, this study was undertaken to see if pretreatment with methylprednisolone 30 mg kg-1 modifies the endotoxaemia and associated increases in plasma cytokines in 17 patients undergoing cardiac surgery requiring ECC. We found that methylprednisolone suppressed significantly the ECC-induced increases in plasma endotoxin, measured by a conventional Limulus amoebocyte lysate assay (Toxicolor), and interleukin-6. Plasma concentrations of endotoxin, measured by a highly specific chromogenic Limulus test (Endospecy test), tumour necrosis factor-alpha and interleukin-1 beta did not increase significantly in either the control or methylprednisolone groups.
Insights
Methylprednisolone pretreatment significantly reduced endotoxemia and interleukin-6 increases during extracorporeal circulation (ECC) in cardiac surgery patients. Other endotoxin and cytokine levels showed no significant changes, suggesting a specific effect of the steroid.
Area of Science:
- Cardiovascular Surgery
- Immunology
- Pharmacology
Background:
- Plasma endotoxin levels significantly increase during extracorporeal circulation (ECC).
- This endotoxemia is associated with increased pro-inflammatory cytokines.
- The role of steroid pretreatment in mitigating these effects is not fully understood.
Purpose of the Study:
- To investigate the effect of methylprednisolone pretreatment on endotoxemia and cytokine profiles during cardiac surgery requiring ECC.
- To determine if methylprednisolone modifies the increase in plasma endotoxin and specific cytokines.
Main Methods:
- A study involving 17 patients undergoing cardiac surgery requiring ECC.
- Patients received methylprednisolone (30 mg kg-1) as pretreatment.
- Plasma endotoxin and cytokine levels (interleukin-6, tumor necrosis factor-alpha, interleukin-1 beta) were measured using Limulus amoebocyte lysate assays (Toxicolor and Endospecy tests).
Main Results:
- Methylprednisolone significantly suppressed ECC-induced increases in plasma endotoxin (Toxicolor assay) and interleukin-6.
- No significant increases in plasma endotoxin (Endospecy test), tumor necrosis factor-alpha, or interleukin-1 beta were observed in either the control or methylprednisolone groups.
Conclusions:
- Methylprednisolone pretreatment effectively reduces endotoxemia and interleukin-6 elevation during ECC in cardiac surgery.
- The findings suggest a specific inhibitory effect of methylprednisolone on certain inflammatory mediators in this context.
