PCSK9 Modulates Macrophage Polarization-Mediated Ventricular Remodeling after Myocardial Infarction

Figure 5

In vitro, the exogenous PCSK9 protein induced inflammatory macrophages to acquire the M1 phenotype. The morphologic changes in macrophages stimulated by LPS/IL4. Cell shape changed from round to fusiform in LPS-stimulated RAW264.7 cells to ellipse in IL4-stimulated RAW264.7 cells. Scale  μm. (b) 0.5 μg/mL PCSK9 protein significantly induced IL6 expression in RAW264.7 and have no effect on cell viability. (c) Representative flow cytometry plots showing the percentages of M1 (F4/80⁺/iNOS⁺/CD206^-) and M2 (F4/80⁺/iNOS^-/CD206⁺) phenotype in LPS/IL4-stimulated RAW264.7 cells after cocultivation with PCSK9 protein for 24 h, . Pooled flow cytometry data from (c). (e, f) q-PCR analysis of IL-6, iNOS, TGF-β, and CD206 mRNA expression in LPS/IL4-stimulated RAW264.7 cells after cocultivation with PCSK9 protein for 24 h, . (g) Representative images of Western blots for IL6, iNOS, and TGF-β in LPS/IL4-stimulated RAW264.7 cells after cocultivation with PCSK9 protein for 24 h, . Protein levels of IL6, iNOS, and TGF-β of (g). ; ; ; ns: not significant.

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