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Antimicrobial host defence peptides of human neutrophils – roles in innate immunity

Review article
Authors Åse Björstad
Kelly Brown
Huamei Fu
Claes Dahlgren
Anna Karlsson
Johan Bylund
Published in Anti-Infective Agents in Medicinal Chemistry
Volume 7
Issue 3
Pages 155-168
ISSN 1871-5214
Publication year 2008
Published at Institute of Medicine, Department of Rheumatology and Inflammation Research
Pages 155-168
Language en
Links dx.doi.org/10.2174/1871521087849112...
Keywords Antimicrobial peptide, Cathelicidin, Defensin, Host defence peptide, Immunomodulator, Innate immunity, Neutrophil
Subject categories Medical and Health Sciences

Abstract

The innate immune system is an old defence mechanism that in primitive organisms consists mainly of humoral components like antimicrobial peptides. Many of these peptides share features such as size, cationicity, amphipathicity and kill microbes primarily by lysing the cell membrane. In more evolved organisms, humoral factors are supplemented by cellular components such as professional phagocytes, but the antimicrobial peptides are still important for host defence. Neutrophils are professional phagocytes that in humans contain two different classes of classical antimicrobial peptides belonging to the cathelicidin family and the α-defensin family, respectively. In addition to these two main groups of poly-peptides, neutrophils are also rich in antimicrobial proteins. It is becoming increasingly clear that the antimicrobial peptides of neutrophils not only contribute to phagosomal killing, but also function as regulators of immunity; therefore the alternative name host defence peptides is more appropriate. The question whether antimicrobial host defence peptides are primarily immunomodulatory or antimicrobial in vivo has not been conclusively determined. At some locations in the body, e.g. in a phagosome, their effect is likely directly antimicrobial, whereas their immunomodulatory functions are probably more important at other sites. This review will provide a background to the field of antimicrobial peptides including their common features, mechanisms of killing and availability in nature. It will focus on the antimicrobial peptides present in human neutrophils and special emphasis will be given to the functional dualism displayed by many peptides giving them the ability to modulate the immune response in addition to being directly antimicrobial

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