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Review

The role of leptin in innate and adaptive immune responses

Eiva Bernotiene1, Gaby Palmer2,3 and Cem Gabay2,3 email

Department of Experimental Research, Institute of Experimental and Clinical Medicine, Vilnius University, Vilnius, Lithuania

Division of Rheumatology, Department of Internal Medicine, University Hospital, Geneva, Switzerland

Department of Pathology and Immunology, University of Geneva School of Medicine, Geneva, Switzerland

author email corresponding author email

Arthritis Research & Therapy 2006, 8:217doi:10.1186/ar2004

Published: 28 July 2006

Abstract

Leptin is produced primarily by adipocytes and functions in a feedback loop regulating body weight. Leptin deficiency results in severe obesity and a variety of endocrine abnormalities in animals and humans. Several studies indicated that leptin plays an important role in immune responses. It exerts protective anti-inflammatory effects in models of acute inflammation and during activation of innate immune responses. In contrast, leptin stimulates T lymphocyte responses, thus having rather a proinflammatory role in experimental models of autoimmune diseases. Clinical studies have so far yielded inconsistent results, suggesting a rather complex role for leptin in immune-mediated inflammatory conditions in humans.


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