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Ly6C(high) monocytes become alternatively activated macrophages in schistosome granulomas with help from CD4+ cells
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Ly6C(high) monocytes become alternatively activated macrophages in schistosome granulomas with help from CD4+ cells
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Journal Article
Ly6C(high) monocytes become alternatively activated macrophages in schistosome granulomas with help from CD4+ cells
2014
Overview
Alternatively activated macrophages (AAM) that accumulate during chronic T helper 2 inflammatory conditions may arise through proliferation of resident macrophages or recruitment of monocyte-derived cells. Liver granulomas that form around eggs of the helminth parasite Schistosoma mansoni require AAM to limit tissue damage. Here, we characterized monocyte and macrophage dynamics in the livers of infected CX3CR1(GFP/+) mice. CX₃CR1-GFP⁺ monocytes and macrophages accumulated around eggs and in granulomas during infection and upregulated PD-L2 expression, indicating differentiation into AAM. Intravital imaging of CX₃CR1-GFP⁺ Ly6C(low) monocytes revealed alterations in patrolling behavior including arrest around eggs that were not encased in granulomas. Differential labeling of CX₃CR1-GFP⁺ cells in the blood and the tissue showed CD4⁺ T cell dependent accumulation of PD-L2⁺ CX₃CR1-GFP⁺ AAM in the tissues as granulomas form. By adoptive transfer of Ly6C(high) and Ly6C(low) monocytes into infected mice, we found that AAM originate primarily from transferred Ly6C(high) monocytes, but that these cells may transition through a Ly6C(low) state and adopt patrolling behavior in the vasculature. Thus, during chronic helminth infection AAM can arise from recruited Ly6C(high) monocytes via help from CD4⁺ T cells.
Publisher
Public Library of Science (PLoS)
Subject
/ CD4-Positive T-Lymphocytes - immunology
/ CD4-Positive T-Lymphocytes - metabolism
/ CD4-Positive T-Lymphocytes - parasitology
/ Female
/ Green Fluorescent Proteins - genetics
/ Green Fluorescent Proteins - metabolism
/ Male
/ Programmed Cell Death 1 Ligand 2 Protein - metabolism
/ Recombinant Proteins - metabolism
/ Schistosoma mansoni - growth & development
/ Schistosoma mansoni - immunology
/ Schistosomiasis mansoni - immunology
/ Schistosomiasis mansoni - metabolism
/ Schistosomiasis mansoni - parasitology
