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Dose Response. 2011;9(3):332-47. doi: 10.2203/dose-response.10-013.Yeager. Epub 2010 Aug 12.

Cortisol exerts bi-phasic regulation of inflammation in humans.

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1
Department of Anesthesiology and Critical Care Medicine, Dartmouth-Hitchcock Medical Center.

Abstract

Natural and synthetic glucocorticoids (GCs) have been used for decades to suppress inflammation. In this paper, we re-examine the role of the endogenous GC, cortisol, as a primary homeostatic regulator of the human inflammatory response to injury. Our data show that cortisol regulation of innate immunity can be both pro-inflammatory and anti-inflammatory. Using a human model of in vivo cortisol depletion, we first show that baseline (diurnal) cortisol concentrations do not exert an anti-inflammatory effect. This is the first clue that cortisol regulation of inflammation is not represented by a linear dose-response relationship. We next show in surgical patients that cortisol does exert an acute anti-inflammatory effect over a carefully regulated range of physiologic cortisol concentrations. Finally, transient pre-treatment of healthy humans with cortisol induces a bi-phasic response during a later, delayed systemic inflammatory response: an intermediate cortisol concentration augments inflammation while a high cortisol concentration is neither pro- nor anti-inflammatory. Based on these findings and the work of others, we propose a new paradigm that identifies cortisol regulation of human inflammation as both dualistic-it is pro- and anti-inflammatory-and dynamic, it evolves over time.

KEYWORDS:

Glucocorticoid; bi-phasic; cortisol inflammation; endotoxemia; innate immunity

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