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oai:docta.ucm.es:20.500.14352/718412024-10-03T15:39:14Zcom_20.500.14352_14col_20.500.14352_15
Docta Complutense author García-Fojeda, Belén author Minutti, Carlos M. author Montero Fernández, Carlos author Stamme, Cordula author Casals Carro, María Cristina 2023-06-22T10:53:20Z 2023-06-22T10:53:20Z 2022-04-04 1664-3224 10.3389/fimmu.2022.860262 https://hdl.handle.net/20.500.14352/71841 https://doi.org/10.3389/fimmu.2022.860262 https://www.frontiersin.org/articles/10.3389/fimmu.2022.860262/full Activation of tissue repair program in macrophages requires the integration of IL-4/IL-13 cytokines and tissue-specific signals. In the lung, surfactant protein A (SP-A) is a tissue factor that amplifies IL-4Ra-dependent alternative activation and proliferation of alveolar macrophages (AMs) through the myosin18A receptor. However, the mechanism by which SP-A and IL-4 synergistically increase activation and proliferation of AMs is unknown. Here we show that SP-A amplifies IL-4-mediated phosphorylation of STAT6 and Akt by binding to myosin18A. Blocking PI3K activity or the myosin18A receptor abrogates SP-A´ s amplifying effects on IL-4 signaling. SP-A alone activates Akt, mTORC1, and PKCz and inactivates GSK3a/b by phosphorylation, but it cannot activate arginase-1 activity or AM proliferation on its own. The combined effects of IL-4 and SP-A on the mTORC1 and GSK3 branches of PI3K-Akt signaling contribute to increased AM proliferation and alternative activation, as revealed by pharmacological inhibition of Akt (inhibitor VIII) and mTORC1 (rapamycin and torin). On the other hand, the IL-4+SP-A-driven PKCz signaling axis appears to intersect PI3K activation with STAT6 phosphorylation to achieve more efficient alternative activation of AMs. Consistent with IL-4+SP-A-driven activation of mTORC1 and mTORC2, both agonists synergistically increased mitochondrial respiration and glycolysis in AMs, which are necessary for production of energy and metabolic intermediates for proliferation and alternative activation. We conclude that SP-A signaling in AMs activates PI3K-dependent branched pathways that amplify IL-4 actions on cell proliferation and the acquisition of AM effector functions. eng Atribución 3.0 España Signaling Pathways That Mediate Alveolar Macrophage Activation by Surfactant Protein A and IL-4 journal article URL https://docta.ucm.es/bitstreams/b79ca7db-e428-460b-8527-5b21b8b11162/download File MD5 db2b1c71597147098de44070f4af84c3 9302605 application/pdf García-Fojeda, B. et al. 2020. Signaling Pathways That Mediate Alveolar Macrophage....pdf URL https://docta.ucm.es/bitstreams/13b7d8fa-9b14-49bf-b14c-396343967c86/download File MD5 20c2fef7b2acfb56711185f5ba74e813 94808 text/plain García-Fojeda, B. et al. 2020. Signaling Pathways That Mediate Alveolar Macrophage....pdf.txt