Expression of Beta-defensin 1 and 2 MRNA by Human Monocytes, Macrophages and Dendritic Cells

Overview

Journal Immunology

Specialty Allergy & Immunology

Date 2002 Aug 3

PMID 12153515

Citations 70

Authors

Louise A Duits

Bep Ravensbergen

Mirjam Rademaker

Pieter S Hiemstra

Peter H Nibbering

Affiliations

Soon will be listed here.

Abstract

Human beta-defensins are broad-spectrum antimicrobial peptides known to be produced by epithelial cells. It was recently shown that beta-defensins also display chemotactic activity for dendritic cells (DC) and T cells, and thus may serve to link innate and adaptive immunity. The aim of the present study was to explore expression of mRNA for these peptides in mononuclear phagocytes and DC. The results revealed that monocytes, monocyte-derived-macrophages (MDM), and monocyte-derived-dendritic cells (DC) all express human-beta-defensin-1 (hBD-1) mRNA. hBD-1 mRNA expression by monocytes and MDM was increased after activation with interferon-gamma (IFN-gamma) and/or lipopolysaccharide (LPS) in a dose- and time-dependent fashion. Alveolar macrophages showed an intense hBD-1 expression, which could not be further increased. Expression of hBD-1 mRNA by immature DC was low, and increased considerably after maturation. Monocytes, MDM, alveolar macrophages and DC showed a limited expression of human beta-defensin-2 (hBD-2) mRNA, which could only be increased in monocytes and alveolar macrophages by IFN-gamma and/or LPS in a dose- and time-dependent fashion. Immunocytochemical stainings demonstrated the expression of hBD-2 peptide by freshly isolated blood monocytes and alveolar macrophages in cytospin preparations.

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