Journal: Acta biomaterialia

Article Title: A subtype specific probe for targeted magnetic resonance imaging of M2 tumor-associated macrophages in brain tumors.

doi: 10.1016/j.actbio.2025.01.003

Figure Lengend Snippet: Fig. 6. Immunohistochemical and FACS validations of M2pep-uIONP targeting M2 TAMs. Confocal microscopic images of tumor tissues collected from mice at 24 h after i.v. injection of probes show (A) Cy7-M2pep-uIONP were highly co-localizing with CD68- and CD163-double positive M2 TAM, revealing the targeting specificity. In comparison, the non-targeted control probe Cy7-scM2pep-uIONP and Cy7-Ferumoxytol not only exhibited much less tumoral accumulation, but also were not co-localized with M2 TAM. Scale bars: 37 µm. (B) Flow cytometric zebra plots and (C) the corresponding quantification of CD68- and CD163-double positive M2 TAM targeted by FITC-M2pep-uIONP, FITC-scM2pep-uIONP, and FITC-Ferumoxytol. The gating strategy involves sorting CD163+ M2 TAM population in live cells dissociated from mouse cerebrums by gating on CD68+ pan-macrophage populations, followed by further gating to assess the FITC-labeled nanoparticles.

Article Snippet: Rabbit polyclonal anti-CD163 antibody was purchased from Boster Biological Technology (Pleasanton, CA, USA).

Techniques: Immunohistochemical staining, Injection, Comparison, Control, Labeling