Tumor necrosis factor-alpha (TNF-α) release from RAW264.7 murine macrophages on exposure to different stimulating agents: pDNA and MDP applied either alone or in combination in solution, or with TMC nanoparticles (TMC-NP), SWE06, and Cationorm®, respectively. Bars represent mean values (n = 3) ± SEM. pDNA loaded nanoformulations were compared with either pDNA alone (*) or with [pDNA + MDP] loaded nanoformulations (*), and [pDNA + MDP] in solution with [nanocarrier + pDNA + MDP] (x). Significant differences were indicated with ** (p < 0.01), *** (p < 0.001), and ns (not significant).