Volume 62, Issue 1 pp. 268-279
Myositis

Muscle resident macrophages control the immune cell reaction in a mouse model of notexin-induced myoinjury

Madly Brigitte

Madly Brigitte

INSERM U955, Groupe Hospitalier Henri Mondor-Albert Chenevier, Assistance Publique Hôpitaux de Paris, and Université Paris 12 Val-de-Marne, Créteil, France

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Clementine Schilte

Clementine Schilte

INSERM U818 and Institut Pasteur, Paris, France

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Anne Plonquet

Anne Plonquet

Groupe Hospitalier Henri Mondor-Albert Chenevier and Assistance Publique Hôpitaux de Paris, Créteil, France

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Yasmine Baba-Amer

Yasmine Baba-Amer

INSERM U955, Groupe Hospitalier Henri Mondor-Albert Chenevier, Assistance Publique Hôpitaux de Paris, and Université Paris 12 Val-de-Marne, Créteil, France

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Adeline Henri

Adeline Henri

INSERM U955 and Université Paris 12 Val-de-Marne, Créteil, France

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Caroline Charlier

Caroline Charlier

Institut Pasteur, Paris, France

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Shahragim Tajbakhsh

Shahragim Tajbakhsh

Institut Pasteur, Paris, France

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Matthew Albert

Matthew Albert

INSERM U818 and Institut Pasteur, Paris, France

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Romain K. Gherardi

Corresponding Author

Romain K. Gherardi

INSERM U955, Groupe Hospitalier Henri Mondor-Albert Chenevier, Assistance Publique Hôpitaux de Paris, and Université Paris 12 Val-de-Marne, Créteil, France

Drs. Gherardi and Chrétien contributed equally to this work.

INSERM U955-E10, Faculty of Medicine of Créteil, 8 rue du Général Sarrail, 94010 Créteil Cedex, FranceSearch for more papers by this author
Fabrice Chrétien

Fabrice Chrétien

INSERM U955, Groupe Hospitalier Henri Mondor-Albert Chenevier, Assistance Publique Hôpitaux de Paris, Université Paris 12 Val-de-Marne, Créteil, and Institut Pasteur, Paris, France

Drs. Gherardi and Chrétien contributed equally to this work.

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First published: 28 December 2009
Citations: 150

Abstract

Objective

Skeletal muscle may be the site of a variety of poorly understood immune reactions, particularly after myofiber injury, which is typically observed in inflammatory myopathies. This study was undertaken to explore both the cell dynamics and functions of resident macrophages and dendritic cells (DCs) in damaged muscle, using a mouse model of notexin-induced myoinjury to study innate immune cell reactions.

Methods

The myeloid cell reaction to notexin-induced myoinjury was analyzed by microscopy and flow cytometry. Bone marrow (BM) transplantation studies were used to discriminate resident from exudate monocyte/macrophages. Functional tests included cytokine screening and an alloantigenic mixed leukocyte reaction to assess the antigen-presenting cell (APC) function. Selective resident macrophage depletion was obtained by injection of diphtheria toxin (DT) into CD11b–DT receptor–transgenic mice transplanted with DT-insensitive BM.

Results

The connective tissue surrounding mouse muscle/fascicle tissue (the epimysium/perimysium) after deep muscle injury displayed a resident macrophage population of CD11b+F4/80+CD11c−Ly-6C−CX3CR1− cells, which concentrated first in the epimysium. These resident macrophages were being used by leukocytes as a centripetal migration pathway, and were found to selectively release 2 chemokines, cytokine-induced neutrophil chemoattractant and monocyte chemoattractant protein 1, and to crucially contribute to massive recruitment of neutrophils and monocytes from the blood. Early epimysial inflammation consisted of a predominance of Ly-6ChighCX3CR1lowCD11c− cells that were progressively substituted by Ly-6ClowCX3CR1high cells displaying an intermediate, rather than high, level of CD11c expression. These CD11cintermediate cells were derived from circulating CCR2+ monocytes, functionally behaved as immature APCs in the absence of alloantigenic challenge, and migrated to draining lymph nodes while acquiring the phenotype of mature DCs (CD11c+Ia+CD80+ cells, corresponding to an inflammatory DC phenotype).

Conclusion

The results in this mouse model show that resident macrophages in the muscle epimysium/perimysium orchestrate the innate immune response to myoinjury, which is linked to adaptive immunity through the formation of inflammatory DCs.

The full text of this article hosted at iucr.org is unavailable due to technical difficulties.

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