Modulation of host defense by hydrocortisone in stress doses during endotoxemia
- Axel R. HellerAffiliated withDepartment of Anesthesiology and Intensive Care Medicine, University Hospital Carl Gustav Carus Email author
- , Susanne C. HellerAffiliated withDepartment of Anesthesiology and Intensive Care Medicine, University Hospital Carl Gustav Carus
- , Annette BorkensteinAffiliated withInstitute of Medical Microbiology and Hygiene, University Hospital Mannheim
- , Sebastian N. StehrAffiliated withDepartment of Anesthesiology and Intensive Care Medicine, University Hospital Carl Gustav Carus
- , Thea KochAffiliated withDepartment of Anesthesiology and Intensive Care Medicine, University Hospital Carl Gustav Carus
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To investigate the effects of low-dose hydrocortisone (HC) on neutrophil respiratory burst, phagocytosis, and elimination of E. coli from blood and tissue under endotoxemic and non-endotoxemic conditions.
Randomized, controlled trial.
Experimental laboratory, university hospital.
Forty-eight female chinchilla rabbits (n=8 in six groups A–F).
In order to quantify the bacterial clearance process, defined numbers [108 colony forming units (CFU)] of Escherichia coli were injected intravenously into all anesthetized rabbits. Group A did not receive further intervention. Group B received bolus administration of HC 1.4 mg/kg and group C 14 mg/kg. Endotoxin (LPS, 40 μg/kg/h) was given to groups D, E, and F. Group E received additional bolus administration of HC 1.4 mg/kg and group F 14 mg/kg. All HC groups (B, C, E, and F) were continuously infused with HC 0.18 mg/kg/h.
Monitored parameters were neutrophil respiratory burst and phagocytosis activity, rates of bacterial elimination from the blood, arterial blood pressure, serum lactate and LPS concentrations, as well as nitrite and nitrate levels. Tissue samples of liver, kidney, spleen, and lung were collected for bacterial counts.
In controls HC significantly delayed elimination of injected E. coli from the blood (P<0.01). LPS also prolonged bacterial elimination but additional HC did not further delay removal of E. coli from the blood. Under endotoxemia HC depressed respiratory burst, whereas phagocytosis functions remained unaltered. Moreover, bacterial colonization of organs was reduced after HC in the LPS groups. Significance, however, was reached only in the liver (P<0.05). Due to HC, clearance from LPS (P<0.01) and lactate (P<0.05) were improved. Levels of nitrite and nitrate did not differ among the groups.
HC demonstrated immunomodulatory effects even in stress doses. In endotoxemic states use of low-dose HC seems to be favorable, although not in non-septic conditions.
KeywordsHydrocortisone Respiratory burst Phagocytosis Neutrophils Bacterial killing Sepsis
- Modulation of host defense by hydrocortisone in stress doses during endotoxemia
Intensive Care Medicine
Volume 29, Issue 9 , pp 1456-1463
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- Respiratory burst
- Bacterial killing
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- Author Affiliations
- 1. Department of Anesthesiology and Intensive Care Medicine, University Hospital Carl Gustav Carus, Fetscherstrasse 74, 01309, Dresden, Germany
- 2. Institute of Medical Microbiology and Hygiene, University Hospital Mannheim, Germany