The AAV9-SLPI infection has significantly reduced inflammatory cytokine levels when compared with AAV9 group (TNF-α: 85.92 ± 36.24 ng/mg vs. 186.1 ± 12.17 ng/mg, p < 0.05, IL-1β: 29.48 ± 4.20 ng/mg vs. 69.03 ± 9.17 ng/mg, p < 0.05, and IL-6: 74.23 ± 10.50 ng/mg vs. 113.1 ± 28.43 ng/mg, p < 0.05) (Figures 4A–C). Here, TNF is linked to infection.