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Thromb Res. 2014 Mar;133(3):390-5. doi: 10.1016/j.thromres.2013.10.039. Epub 2013 Nov 1.

Hemarthrosis in hemophilic mice results in alterations in M1-M2 monocyte/macrophage polarization.

Author information

1
Rheumatology & Clinical Immunology, University Medical Center, Utrecht, The Netherlands; Hematology & Van Creveldkliniek, University Medical Center, Utrecht, The Netherlands. Electronic address: l.nieuwenhuizen@umcutrecht.nl.
2
Hematology & Van Creveldkliniek, University Medical Center, Utrecht, The Netherlands.
3
Rheumatology & Clinical Immunology, University Medical Center, Utrecht, The Netherlands.

Abstract

INTRODUCTION:

Joint bleedings result in iron-mediated synovitis and cartilage destruction. Monocyte/macrophage polarization affects their role in iron homeostasis. This study evaluates the effects of hemarthrosis on monocyte/macrophage polarization.

MATERIALS AND METHODS:

Using a murine hemophilia model of acute joint bleeding and flow cytometry, we evaluated monocyte/macrophage polarization in blood, spleen, synovium, and knee lavage at day 1, 2, and 7 following the induction of hemarthrosis.

RESULTS:

Induction of hemarthrosis resulted in a transient shift of blood monocytes towards a M1 type (control 13 vs. 1847 counted cells at day 1; p<0.01), a temporary decrease of spleen M1 monocytes (control 2841 vs. 1086 counted cells at day 1; p=0.02), and a sustained decrease of spleen M2 red pulp macrophages (control 1853 vs. 673 counted cells at day 7; p=0.01). In addition, an increase in M1 (control 119 vs. 592 counted cells at day 1; p=0.04) and M2 (control 247 vs. 650 counted cells at day 1; p=0.02) synovial macrophages was noted. In the joint lavage, a temporary increase in M1 monocytes (control 20 vs. 125 counted cells at day 1; p=0.04) and a more sustained increase in M2 monocytes (control 73 vs. 186 counted cells at day 2; p<0.01) was observed.

CONCLUSIONS:

This study demonstrates alterations in monocyte/macrophage polarization following hemarthrosis resulting in a blood monocyte M1 phenotype and a combined M1-M2 monocyte/macrophage phenotype in the joint. Based on the different capabilities of M1 and M2 cells, modulating polarization of distinct monocyte/macrophage populations might represent interesting prophylactic or therapeutic approaches for joint bleedings.

KEYWORDS:

M1-M2 polarization; hemarthrosis; hemophilia; macrophage; monocyte

PMID:
24252538
DOI:
10.1016/j.thromres.2013.10.039
[Indexed for MEDLINE]

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