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• W4387394893 abstract "Background Pulmonary antibody-mediated rejection is still a challenging diagnosis as C4d has poor sensitivity. Previous studies have indicated that the phosphorylated S6 ribosomal protein, a component of the mammalian target of rapamycin (mTOR) pathway, is correlated with de novo donor-specific antibodies in lung transplantation. The objective of this study was to evaluate the phosphorylation of S6 ribosomal protein as a surrogate for AMR diagnosis in lung transplant patients. Methods This multicentre retrospective study analyzed transbronchial biopsies from 216 lung transplanted patients, 114 with antibody-mediated rejection and 102 without (19 with acute cellular rejection, 17 with ischemia/reperfusion injury, 18 with infection, and 48 without post-transplant complications). Immunohistochemistry was used to quantify phosphorylated S6 ribosomal protein expression in macrophages, endothelium, epithelium, and inter-pathologist agreement was assessed. Results Median phosphorylated S6 ribosomal protein expression values were higher in antibody-mediated rejection cases than in controls for all cell components, with the highest sensitivity in macrophages (0.9) and the highest specificity in endothelial expression (0.8). The difference was mainly significant in macrophages compared to other post-lung transplantation complications. Inter-pathologist agreement was moderate for macrophages and endothelium, with higher agreement when phosphorylated S6 ribosomal protein expression was dichotomized into positive/negative. The inclusion of phosphorylated S6 ribosomal protein in the diagnostic algorithm could have increased antibody-mediated rejection certainty levels by 25%. Conclusions The study supports the role of the mTOR pathway in antibody-mediated rejection-related graft injury and suggests that tissue phosphorylation of S6 ribosomal protein could be a useful surrogate for a more accurate pathological diagnosis of lung antibody-mediated rejection." @default.
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• W4387394893 date "2023-10-01" @default.
• W4387394893 modified "2023-10-17" @default.
• W4387394893 title "ASSESSING THE ROLE OF PHOSPHORYLATED S6 RIBOSOMAL PROTEIN IN THE PATHOLOGICAL DIAGNOSIS OF PULMONARY ANTIBODY-MEDIATED REJECTION" @default.
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• W4387394893 doi "https://doi.org/10.1016/j.healun.2023.10.002" @default.
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