Myeloid HIFs are dispensable for resolution of inflammation during skeletal muscle regeneration

J Gondin, M Théret, G Duhamel, K Pegan… - The Journal of …, 2015 - journals.aai.org
J Gondin, M Théret, G Duhamel, K Pegan, JRR Mathieu, C Peyssonnaux, S Cuvellier…
The Journal of Immunology, 2015journals.aai.org
Besides their role in cellular responses to hypoxia, hypoxia-inducible factors (HIFs) are
involved in innate immunity and also have anti-inflammatory (M2) functions, such as
resolution of inflammation preceding healing. Whereas the first steps of the inflammatory
response are associated with proinflammatory (M1) macrophages (MPs), resolution of
inflammation is associated with anti-inflammatory MPs exhibiting an M2 phenotype. This M1
to M2 sequence is observed during postinjury muscle regeneration, which provides an …
Abstract
Besides their role in cellular responses to hypoxia, hypoxia-inducible factors (HIFs) are involved in innate immunity and also have anti-inflammatory (M2) functions, such as resolution of inflammation preceding healing. Whereas the first steps of the inflammatory response are associated with proinflammatory (M1) macrophages (MPs), resolution of inflammation is associated with anti-inflammatory MPs exhibiting an M2 phenotype. This M1 to M2 sequence is observed during postinjury muscle regeneration, which provides an excellent paradigm to study the resolution of sterile inflammation. In this study, using in vitro and in vivo approaches in murine models, we demonstrated that deletion of hif1a or hif2a in MPs has no impact on the acquisition of an M2 phenotype. Furthermore, using a multiscale methodological approach, we showed that muscles did not require macrophagic hif1a or hif2a to regenerate. These results indicate that macrophagic HIFs do not play a crucial role during skeletal muscle regeneration induced by sterile tissue damage.
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