YSV inhibited the expression and activity of MMP-2 and MMP-9.
Notes: (A) Gelatin zymography assay for MMP-2 and MMP-9 activities from supernatant of 95D, A549, and NCI-H1299 cells after treated with YSV in vitro. Supernatants of lung cancer cells treated with different concentrations of YSV for 48 hours were collected and loaded onto 10% acrylamide (containing 0.1% gelatin) gels. After electrophoresis, the gels were washed, incubated, stained, and destained. Gelatinolytic activities were identified as clear bands on a background. The relative gelatinolytic activities of MMP-2 and MMP-9 were quantified densitometrically in relation to the activity without YSV. (B) Real-time PCR analysis of MMP-2 and MMP-9 mRNA levels in the 95D, A549, and NCI-H1299 cells after treated with YSV in vitro. Real-time PCR was performed on total RNA for detection of mRNA level of MMP-2 and MMP-9. The products were quantified using β-actin as an internal reference. (C) 2% agarose gel electrophoresis of real-time PCR production. (D) Western blot analysis of the levels of MMP-2 and MMP-9 in the 95D, A549, and NCI-H1299 cells after treated with YSV in vitro. Total proteins of lung cancer cells treated with different concentrations of YSV for 48 hours were extracted and separated by SDS-PAGE. After electrophoresis, the protein was transferred to PVDF membrane, and detection was performed with antibodies against target proteins. The products are reported as the target protein/β-actin densitometric ratio calculated by the TotalLab software to compute the relative expression of proteins. *P<0.05, compared to control group, tested using one-way ANOVA and Student–Newman–Keuls test (N=3).
Abbreviations: YSV, tyroservatide; MMP, matrix metalloproteinase; PVDF, polyvinylidene difluoride; PCR, polymerase chain reaction; SDS-PAGE, sodium dodecyl sulfate polyacrylamide gel electrophoresis; ANOVA, analysis of variance.