Wnt7a Induces a Unique Phenotype of Monocyte-derived Macrophages with Lower Phagocytic Capacity and Differential Expression of Pro- and Anti-inflammatory Cytokines

Overview

Journal Immunology

Specialty Allergy & Immunology

Date 2017 Sep 6

PMID 28872671

Citations 10

Authors

Jennillee Wallace

Victoria Lutgen

Sreedevi Avasarala

Brad St Croix

Robert A Winn

Lena Al-Harthi

Affiliations

Soon will be listed here.

Abstract

The variation of macrophage functions suggests the involvement of multiple signalling pathways in fine tuning their differentiation. Macrophages that originate from monocytes in the blood migrate to tissue in response to homeostatic or 'danger' signals and undergo substantial morphological and functional modifications to meet the needs of the dominant signals in the microenvironment. Wnts are secreted glycoproteins that play a significant role in organ and cell differentiation, yet their impact on monocyte differentiation is not clear. In this study, we assessed the role of Wnt1 and Wnt7a on the differentiation of monocytes and the subsequent phenotype and function of monocyte-derived macrophages (MDMs). We show that Wnt7a decreased the expression of CD14, CD11b, CD163 and CD206, whereas Wnt1 had no effect. The Wnt7a effect on CD11b was also observed in the brain and spleen of Wnt7a adult brain mouse tissue and in embryonic Wnt7a tissue. Wnt7a reduced the phagocytic capacity of M-MDMs, decreased interleukin-10 (IL-10) and IL-12 secretion and increased IL-6 secretion. Collectively, these findings demonstrate that Wnt7a generates an MDM phenotype with both pro-inflammatory and alternative MDM cytokine profiles and reduced phagocytic capacity. As such, Wnt7a can have a significant impact on macrophage responses in health and disease.

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