| First Author | Ankley LM | Year | 2024 |
| Journal | Immunohorizons | Volume | 8 |
| Issue | 2 | Pages | 147-162 |
| PubMed ID | 38345473 | Mgi Jnum | J:354751 |
| Mgi Id | MGI:7736430 | Doi | 10.4049/immunohorizons.2300107 |
| Citation | Ankley LM, et al. (2024) GSK3alpha/beta Restrain IFN-gamma-Inducible Costimulatory Molecule Expression in Alveolar Macrophages, Limiting CD4+ T Cell Activation. Immunohorizons 8(2):147-162 |
| abstractText | Macrophages play a crucial role in eliminating respiratory pathogens. Both pulmonary resident alveolar macrophages (AMs) and recruited macrophages contribute to detecting, responding to, and resolving infections in the lungs. Despite their distinct functions, it remains unclear how these macrophage subsets regulate their responses to infection, including how activation by the cytokine IFN-gamma is regulated. This shortcoming prevents the development of therapeutics that effectively target distinct lung macrophage populations without exacerbating inflammation. We aimed to better understand the transcriptional regulation of resting and IFN-gamma-activated cells using a new ex vivo model of AMs from mice, fetal liver-derived alveolar-like macrophages (FLAMs), and immortalized bone marrow-derived macrophages. Our findings reveal that IFN-gamma robustly activates both macrophage types; however, the profile of activated IFN-gamma-stimulated genes varies greatly between these cell types. Notably, FLAMs show limited expression of costimulatory markers essential for T cell activation upon stimulation with only IFN-gamma. To understand cell type-specific differences, we examined how the inhibition of the regulatory kinases GSK3alpha/beta alters the IFN-gamma response. GSK3alpha/beta controlled distinct IFN-gamma responses, and in AM-like cells, we found that GSK3alpha/beta restrained the induction of type I IFN and TNF, thus preventing the robust expression of costimulatory molecules and limiting CD4+ T cell activation. Together, these data suggest that the capacity of AMs to respond to IFN-gamma is restricted in a GSK3alpha/beta-dependent manner and that IFN-gamma responses differ across distinct macrophage populations. These findings lay the groundwork to identify new therapeutic targets that activate protective pulmonary responses without driving deleterious inflammation. |
