11β-Hydroxysteroid dehydrogenase type 1—A role in inflammation?

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Abstract

Glucocorticoids are widely used for their potent anti-inflammatory effects. Endogenous glucocorticoids are immunomodulatory and shape both adaptive and innate immune responses. Over the past decade, it has become apparent that an important level of control over endogenous glucocorticoid action is exerted by the 11β-hydroxysteroid dehydrogenase enzymes. The type 1 enzyme, 11β-HSD1, reduces inert glucocorticoids into active forms, thereby increasing intracellular ligand availability to receptors. Although 11β-HSD1 activity has been shown to play an important role in the metabolic actions of glucocorticoids, its role in the immune response has, until recently, remained unclear. Here we review recent evidence pertaining to the role of 11β-HSD1 in the inflammatory response.

Section snippets

Perspective

Glucocorticoids exert potent immunomodulatory effects. At pharmacological levels they are powerful immunosuppressive and anti-inflammatory agents. Clinically, they are widely prescribed to treat inflammation, where often they are the most effective therapy and their utility is limited only by the side effects of long term treatment. The first use of glucocorticoids to treat inflammation in humans was in the late 1940s, by Philip Hench, who in collaboration with Edward Kendall, successfully used

The inflammatory response as an innate response to injury or infection

The inflammatory response, part of the innate immune system, is a first line host defence mechanism that, upon injury, protects against invading pathogens and repairs damaged tissue. The classic signs of inflammation include redness, swelling, heat and pain and result from the release of proinflammatory mediators (e.g. tumour necrosis factor-α; TNF-α) and increased vasodilation and capillary permeability, promoting migration of leukocytes into injured tissues. Activated neutrophil granulocytes

Glucocorticoids suppress the initiation of the inflammatory response

It has been hypothesised that endogenous glucocorticoids provide a “brake” during the initial inflammatory response, to prevent its potentially lethal overshoot (Munck et al., 1984). Support for this view has come from experiments in adrenalectomised rats, in which glucocorticoid treatment is essential to survive challenge with horse serum (Dougherty and Schneebeli, 1955), bacterial lipopolysaccharide (LPS) or tumour necrosis factor-α (TNF-α) (Bertini et al., 1988). However, the view that

11β-HSD1

The enzymatic conversion of cortisone to cortisol by 11β-HSD was described by Amelung et al. (1953), shortly after the award of the 1950 Nobel Prize to Hench. However, it was almost 40 years later that it became clear that there are two enzymes responsible for the interconversion of cortisone and cortisol; 11β-HSD1 which predominantly reactivates and 11β-HSD2, which inactivates glucocorticoids in vivo (reviewed in Seckl and Walker (2001); Tomlinson and Stewart (2001) and elsewhere in this

Future prospects

Macrophages play an essential role in the innate immune system. However, activated macrophages are also central to the pathogenesis of human diseases, including chronic inflammatory conditions and atherogenesis. Given the well known adverse cardiometabolic effects of glucocorticoids and the expression of 11β-HSD1 in macrophages, there is clear potential for macrophage 11β-HSD1 to influence atherogenesis (reviewed by Theringer, this volume).

Elucidation of the transcriptional regulation of

Acknowledgements

Work in the authors’ laboratories is funded by The Wellcome Trust, The National Kidney Research Fund and The Medical Research Council. JSG was supported by a 4 year Ph.D. award from the Wellcome Trust. We thank members of the Centre for Inflammation Research and the Endocrinology Unit for many stimulating discussions.

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