Figure 4. The stromal cells in the RNAi group expressed a lower level of the hypoxia-inducible factor-1α (HIF-1α) protein (average gray value = 0.336 ± 0.053) than in the pre-RNAi group (average gray value = 0.845 ± 0.084; P < 0.05) and the neg-RNAi group (average gray value = 0.798 ± 0.079; P < 0.05) at 4 days after infection, indicating that the RNAi lentivirus vector targeting HIF-1α could efficiently knock down the protein expression of HIF-1α. The t-test was used for statistical analyses.
