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. 2015 Sep 28;7(11):1426–1449. doi: 10.15252/emmm.201404976

Figure 9. YAP is involved in HPV-E6 regulation of cervical cancer cell growth.

Figure 9

  1. Effect of recombinant HPV16 E6 protein on the proliferation of HT3 cells. Each point represents mean ± SEM (n = 5). ***P = 0.0001 compared with control (Ctrl) on day 4. HT3 cells were cultured in serum-reduced medium in the presence or absence of recombinant HPV16 E6 (400 nM).
  2. Recombinant HPV16 E6 protein increased YAP protein level, but had no effect on β-actin protein level in HT3 cells. Cell culture and treatment procedure are the same as described in (A).
  3. AREG mRNA levels in HT3 cells incubated for 48 h with or without recombinant HPV E6. Each bar represents mean ± SEM (n = 5). Bars with different letters are significantly different from each other (P = 0.0042).
  4. Western blotting analysis showing the effect of HPV16 E6 (400 nM, 48 h) on YAP protein levels in HT3 cells transfected with non-targeting control siRNA (siCtrl) or YAP siRNA (siYAP).
  5. Effect of YAP on HPV16 E6 stimulation of HT3 cell proliferation. siCtrl: non-targeting control siRNA; siYAP: YAP siRNA; E6: 400 nM recombinant HPV16 E6, 48 h. Each bar represents mean ± SEM (n = 4). Bars with the same letters are not significantly different from each other (siCtrl vs. siCtrl+E6, P = 0.0232; siCtrl+E6 vs. siYAP+E6, P = 0.0011).
  6. Knockdown of endogenous E6 in HeLa cells with HPV18 E6 siRNA (siE6) reduced YAP protein in HeLa cells, while knockdown of YAP with YAP siRNA (siYAP) in these cells had no effect on the mRNA level of HPV18 E6. siCtrl: non-targeting control siRNA.
  7. Knockdown of endogenous HPV18 E6 in HeLa cells with HPV18 E6-specific siRNA (siE6) significantly suppressed mRNA expression of AREG. Each bar represents mean ± SEM (n = 4). Bars with different letters are significantly different from each other (siCtrl vs. siHPV18E6, P = 0.0181; siCtrl vs. siYAP, P = 0.0005).
  8. Knockdown of endogenous HPV18 E6 in HeLa cells with HPV18 E6-specific siRNA (siE6) significantly suppressed cell growth (n = 9, siCtrl vs. siHPV18E6, P = 0.0002; siCtrl vs. siYAP, P = 0.0004).
  9. Concentrations of AREG in the culture medium of HeLa cells transfected with non-targeting control siRNA (siCTRL) or HPV18 E6 siRNA (siHPV18E6). Each bar represents mean ± SEM (n = 6). Bars with different letters are significantly different from each other (P = 0.0461).

Data information: Quantitative data in (A), (C), and (I) were analyzed for significance using unpaired t-test in GraphPad Prism 5 with Welch’s correction. Data in (E), (G), and (H) were analyzed for significance using one-way ANOVA in GraphPad Prism 5 with Tukey’s post hoc tests.