Figure 2. Aging and obesity promote pro-inflammatory ATMs in young and old male mice GWAT. (A) Representative flow cytometry gating strategy for CD64+CD11c+ ATMs in GWAT SVF derived from ND and HFD fed young and old mice. (B) top row- Immunofluorescence images of old male obese GWAT and old female obese GWAT depicting MAC-2 labeling of CLS (magenta) and CAV-1 labeling of adipocytes (green). Scale bar = 500 μm. (B) bottom row- H&E staining of GWAT sections depicting CLS in old obese male and females. Scale bar = 500 μm. Quantitation as a % of SVF of (C) GWAT ATMs (D) GWAT CD11c+ ATMs (E) GWAT CD11c- ATMs. N=7-12/group. Two-way ANOVA with Bonferroni-Dunn’s post-test was performed for (C, E). Statistics from diet and sex interaction are in box. Statistical significance is indicated by *p<0.05, **p<0.01, ***p<0.001, ****p<0.0001. Student’s t-test was performed for male and female comparisons between the same diet groups indicated by #p<0.05, ##p<0.01 ###p<0.001 and ####p<0.0001; error bars are SEM.