Journal: Advanced Science
Article Title: Copper‐Doped Prussian Blue Nanozymes With Hyaluronic Acid‐Mediated Targeting Alleviate Oxidative Stress and Regulate Cholesterol Handling for Atherosclerosis Therapy
doi: 10.1002/advs.76976
Figure Lengend Snippet: CuPB@HA nanozymes accumulate in atherosclerotic plaques and synergistically remodel lipid metabolism, oxidative stress, and inflammatory polarization in macrophages. (A) Representative in vivo fluorescence images of HFD‐fed ApoE −/− atherosclerotic mice after intravenous administration of Cy5.5‐labeled CuPB or CuPB@HA at 12 and 24 h post‐injection. (B) Ex vivo fluorescence images of major organs, including heart, liver, spleen, lung, and kidney, harvested at corresponding time points after nanozyme administration. (C) Representative confocal fluorescence images of atherosclerotic plaque sections from HFD‐fed ApoE −/− mice showing the spatial association of Cy5.5‐labeled CuPB@HA with CD68‐positive macrophage‐rich regions and CD44‐positive regions. Cy5.5‐labeled CuPB@HA is pseudo‐colored red, CD68 or CD44 is shown in green. (D) Fluorescence microscopy images showing the time‐dependent cellular uptake of FITC‐labeled CuPB and CuPB@HA by macrophages, with or without excess free HA pre‐incubation. FITC‐labeled nanozymes are shown in green, and nuclei are stained with DAPI in blue. (E) Western blot analysis of proteins related to lipid metabolism, oxidative stress, and inflammatory polarization in RAW264.7 macrophages after different treatments. (F) RT‐qPCR analysis of genes related to lipid metabolism, oxidative stress, and inflammatory polarization in RAW264.7 macrophages after different treatments. (G) Representative Oil Red O staining images showing intracellular lipid accumulation in RAW264.7 macrophages after different treatments. (H–J) Representative immunofluorescence images showing the expression of ARG1 (H), iNOS (I), and CD36 (J) in RAW264.7 macrophages after different treatments. (K) Quantitative analysis of cellular uptake fluorescence intensity in Figure 4D. (L) Quantitative analysis of Oil Red O‐positive areas in Figure 4G (n = 3). (M–O) Quantitative fluorescence analysis of ARG1 (M), iNOS (N), and CD36 (O) staining in Figure 4H–J ( n = 5). Quantitative data are presented as the mean ± SD. Statistical significance was assessed via one‐way ANOVA (* p < 0.05, ** p < 0.01, *** p < 0.001, **** p < 0.0001).
Article Snippet: Subsequently, the samples were incubated overnight at 4°C with specific primary antibodies targeting the M1 marker iNOS (Proteintech, 22226‐1‐AP,1:400), the M2 marker ARG1 (Proteintech, 16001‐1‐AP, 1:400), or the lipid uptake receptor CD36 (MedChemExpress, HY‐P86458, 1:400).
Techniques: In Vivo, Fluorescence, Labeling, Injection, Ex Vivo, Microscopy, Incubation, Staining, Western Blot, Quantitative RT-PCR, Immunofluorescence, Expressing