Fig. 2

A Preparation process of MM@DOX NPs drug delivery system. B TEM image of MM, DOX NPs and MM@DOX NPs (the red arrow showed the cell envelope). C The hydrodynamic size and D zeta potential of MM, DOX NPs and MM@DOX NPs (n = 3, mean ± SD). E Western blot analysis of CCR2 and integrin α4 in MM@DOX NPs, MM and macrophage. F In vitro drug release study with DOX NPs and MM@DOX NPs in PBS under different pH values (n = 3, mean ± SD). G The morphology of DOX NPs and MM@DOX NPs after incubation at pH 5.5. (* p < 0.05)