[HTML][HTML] Macrophages promote epithelial proliferation following infectious and non-infectious lung injury through a Trefoil factor 2-dependent mechanism

LY Hung, D Sen, TK Oniskey, J Katzen… - Mucosal …, 2019 - nature.com
LY Hung, D Sen, TK Oniskey, J Katzen, NA Cohen, AE Vaughan, W Nieves, A Urisman…
Mucosal immunology, 2019nature.com
Coordinated efforts between macrophages and epithelia are considered essential for wound
healing, but the macrophage-derived molecules responsible for repair are poorly defined.
This work demonstrates that lung macrophages rely upon Trefoil factor 2 to promote
epithelial proliferation following damage caused by sterile wounding, Nippostrongylus
brasiliensis or Bleomycin sulfate. Unexpectedly, the presence of T, B, or ILC populations
was not essential for macrophage-driven repair. Instead, conditional deletion of TFF2 in …
Abstract
Coordinated efforts between macrophages and epithelia are considered essential for wound healing, but the macrophage-derived molecules responsible for repair are poorly defined. This work demonstrates that lung macrophages rely upon Trefoil factor 2 to promote epithelial proliferation following damage caused by sterile wounding, Nippostrongylus brasiliensis or Bleomycin sulfate. Unexpectedly, the presence of T, B, or ILC populations was not essential for macrophage-driven repair. Instead, conditional deletion of TFF2 in myeloid-restricted CD11cCre TFF2 flox mice exacerbated lung pathology and reduced the proliferative expansion of CD45 EpCAM+ pro-SPC+ alveolar type 2 cells. TFF2 deficient macrophages had reduced expression of the Wnt genes Wnt4 and Wnt16 and reconstitution of hookworm-infected CD11cCre TFF2flox mice with rWnt4 and rWnt16 restored the proliferative defect in lung epithelia post-injury. These data reveal a previously unrecognized mechanism wherein lung myeloid phagocytes utilize a TFF2/Wnt axis as a mechanism that drives epithelial proliferation following lung injury.
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