Interkeukin-34, a cytokine crucial for the differentiation and maintenance of tissue resident macrophages and Langerhans cells
- PMID: 24737461
- PMCID: PMC4137395
- DOI: 10.1002/eji.201344365
Interkeukin-34, a cytokine crucial for the differentiation and maintenance of tissue resident macrophages and Langerhans cells
Abstract
IL-34 is a recently discovered cytokine that acts on tissue resident macrophages and Langerhans cells upon binding the receptor for CSF-1, CSF-1R. The existence of two ligands for CSF-1R, IL-34, and CSF-1, raises several intriguing questions. Are IL-34 and CSF-1 redundant or does each perform temporally and spatially distinct functions? Is IL-34 involved in human pathology? Would therapeutic strategies based on selective inhibition or administration of either IL-34 or CSF-1 be advantageous for preventing human pathology? Recent in vivo studies indicate that IL-34 promotes the development, survival, and function of microglia and Langerhans cells; therefore, this cytokine may predominately function in brain and skin biology. Here, we review the evidence for IL-34 as a key cytokine in the development and function of these two diverse cell types and discuss its potential role in pathological conditions.
Keywords: CSF-1; IL-34; Langerhans cell; M-CSF; Macrophage; Microglia; Osteoclast.
© 2014 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.
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