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Non-canonical Oncostatin M Signaling Provides Protection during Respiratory Viral and Bacterial infections

Lee, Y.; Patneaude, L. J.; Martins, K. R.; Pihl, R. M. F.; Dimbo, E. L.; Perez-Vazquez, M.; Jayaraman, A.; Crossey, E.; Armstrong, E. M. R.; Hiller, B. E.; Garza, I.; Bosmann, M.; Jones, M. R.; Mizgerd, J. P.; Quinton, L. J.; Traber, K. E.

2026-08-04 immunology
10.64898/2026.07.30.741615 bioRxiv
Show abstract

Pneumonia remains a major global health burden, highlighting the need for host-directed therapies to complement antimicrobial treatment. Here, we identify Oncostatin M (OSM) as a critical regulator of pulmonary host responses during influenza and bacterial pneumonia. Loss of OSM shifted lung macrophages toward a pro-inflammatory phenotype during influenza infection and exacerbated lung injury during bacterial pneumonia, demonstrating an essential role for OSM in limiting immunopathology. Unexpectedly, OSM induced Signal Transducer and Activator of Transcription 3 (STAT3) activation in the absence of the canonical OSM receptor subunit OSMr{beta}, revealing previously unrecognized non-canonical OSM signaling in the mouse lungs. Consistent with this finding, loss of OSMr{beta} did not phenocopy the severe disease observed with loss of OSM. Together, these findings identify OSM as a key regulator of pulmonary immunity and reveal unexpected complexity in OSM signaling during pneumonia.

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