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Collagen VI regulates peripheral nerve regeneration by modulating macrophage recruitment and polarization

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Abstract

Macrophages contribute to peripheral nerve regeneration and produce collagen VI, an extracellular matrix protein involved in nerve function. Here, we show that collagen VI is critical for macrophage migration and polarization during peripheral nerve regeneration. Nerve injury induces a robust upregulation of collagen VI, whereas lack of collagen VI in Col6a1 / mice delays peripheral nerve regeneration. In vitro studies demonstrated that collagen VI promotes macrophage migration and polarization via AKT and PKA pathways. Col6a1 / macrophages exhibit impaired migration abilities and reduced antiinflammatory (M2) phenotype polarization, but are prone to skewing toward the proinflammatory (M1) phenotype. In vivo, macrophage recruitment and M2 polarization are impaired in Col6a1 / mice after nerve injury. The delayed nerve regeneration of Col6a1 / mice is induced by macrophage deficits and rejuvenated by transplantation of wild-type bone marrow cells. These results identify collagen VI as a novel regulator for peripheral nerve regeneration by modulating macrophage function.

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Acknowledgments

We are grateful to W. Giuriati for technical assistance, P. Braghetta for helping with mice and R. Wagener for providing α3(VI) collagen antibodies. This work was supported by grants from the Telethon Foundation (GGP10225 and GGP11082), the Italian Ministry of Education, University and Research (RBAP11Z3YA_003), and the University of Padua Strategic Projects. P. Chen is supported by a fellowship from the Cariparo Foundation and an ImmunoTools award providing the cytokines used in this study.

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Correspondence to Paolo Bonaldo.

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Chen, P., Cescon, M., Zuccolotto, G. et al. Collagen VI regulates peripheral nerve regeneration by modulating macrophage recruitment and polarization. Acta Neuropathol 129, 97–113 (2015). https://doi.org/10.1007/s00401-014-1369-9

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  • DOI: https://doi.org/10.1007/s00401-014-1369-9

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