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. 2022 Apr 1;13(1):578–588. doi: 10.1080/21505594.2022.2051313

Figure 3.

Figure 3.

Expression of multiple virulence factors in S. aureus is inhibited by nepetin. (a) Expression levels of agr, RNAIII, hla, luks, psm-α and spa were determined by qPCR in the presence of 100 μM of nepetin. (b and c) Quantification of α-toxin and PVL expression levels in S. aureus USA300 and Newman under the effect of different concentrations of nepetin by western blot, and their corresponding gray value analysis. (d) The expression levels of nepetin on α-toxin in USA300 and Δclpp-USA300 were examined by Western blot. Nepetin lost its ability to inhibit α-toxin in Δclpp-USA300. (e and f) the effect of different concentrations of nepetin on the hemolytic capacity of S. aureus USA300 and USA300 supernatant. (g) Nepetin induces urease production, which causes the medium to show a pink color. Δclpp-USA300 was used as a positive control. Significance is calculated based on one-way ANOVA: **P < .01 and ***P < .001.