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Res-PD-L1@nmEVs Restores Mitochondrial Homeostasis and Improves Energy Metabolism BEAS-2B cells were pretreated with Res, nEVs, PD-L1@mEVs, PD-L1@nmEVs, or Res-PD-L1@nmEVs followed by H/R stimulation for subsequent analysis. (A) Representative immunofluorescence images showing the expression and localization of PINK1 (green) and the mitochondrial marker TOMM20 (red), indicating activation of mitophagy. Nuclei were stained with DAPI (blue). Scale bar: 50 μm. (B) Quantitative analysis of PINK1 fluorescence intensity. (C) Expression and localization of autophagy-related proteins LC3B and Beclin-1 detected by immunofluorescence. (D-E) Quantitative analysis of LC3B (D) and Beclin-1 (E) fluorescence intensity. (F) Mitochondrial membrane potential assessed by JC-1 staining and flow cytometry. (G) Oxygen consumption rate (OCR) profiles of lung epithelial cells under different treatments. (H-K) Key mitochondrial respiration parameters: basal respiration (H), maximal respiration (I), proton leak (J), and ATP production (K). (L) Representative confocal microscopy images of mitochondria stained with MitoTracker (green) and lysosomes stained with LysoTracker (red), demonstrating mitochondrial-lysosomal colocalization. Scale bar: 5 μm ∗ vs. Control; # vs. H/R; & vs. H/R + PD-L1@nmEVs, p < 0.05.

Journal: Bioactive Materials

Article Title: Inhalable PD-L1-engineered hybrid cellular vesicles suppress excessive neutrophil activation and restore mitochondrial homeostasis to alleviate ischemia–reperfusion lung injury and pneumonia

doi: 10.1016/j.bioactmat.2026.03.024

Figure Lengend Snippet: Res-PD-L1@nmEVs Restores Mitochondrial Homeostasis and Improves Energy Metabolism BEAS-2B cells were pretreated with Res, nEVs, PD-L1@mEVs, PD-L1@nmEVs, or Res-PD-L1@nmEVs followed by H/R stimulation for subsequent analysis. (A) Representative immunofluorescence images showing the expression and localization of PINK1 (green) and the mitochondrial marker TOMM20 (red), indicating activation of mitophagy. Nuclei were stained with DAPI (blue). Scale bar: 50 μm. (B) Quantitative analysis of PINK1 fluorescence intensity. (C) Expression and localization of autophagy-related proteins LC3B and Beclin-1 detected by immunofluorescence. (D-E) Quantitative analysis of LC3B (D) and Beclin-1 (E) fluorescence intensity. (F) Mitochondrial membrane potential assessed by JC-1 staining and flow cytometry. (G) Oxygen consumption rate (OCR) profiles of lung epithelial cells under different treatments. (H-K) Key mitochondrial respiration parameters: basal respiration (H), maximal respiration (I), proton leak (J), and ATP production (K). (L) Representative confocal microscopy images of mitochondria stained with MitoTracker (green) and lysosomes stained with LysoTracker (red), demonstrating mitochondrial-lysosomal colocalization. Scale bar: 5 μm ∗ vs. Control; # vs. H/R; & vs. H/R + PD-L1@nmEVs, p < 0.05.

Article Snippet: Changes in mitochondrial membrane potential were assessed by JC-1 staining (C2003S, Beyotime).

Techniques: Immunofluorescence, Expressing, Marker, Activation Assay, Staining, Fluorescence, Membrane, Flow Cytometry, Confocal Microscopy, Control