Dicalcium Silicate Induced Proinflammatory Responses through TLR2-Mediated NF-κB and JNK Pathways in the Murine RAW 264.7 Macrophage Cell Line

Figure 7

Relative mRNA gene expression. (a) and (b) represent TLR2 expression after being cocultured with 10 μg/mL and 100 μg/mL C₂S or TCP for 6 h and 24 h in RAW 264.7 cells and the relative TLR2 expression after adding siRNA-TLR2-1. After 24 h, the C₂S treatment increased the TLR2 expression more than the TCP treatment compared with the control group. Additionally, the TLR2 mRNA expression in the 10 μg/mL C₂S group was significantly higher than the 100 μg/mL TCP group (). When we added siRNA-TLR2-1 to these groups, the TLR2 mRNA expression obviously decreased in the 100 μg/mL C₂S (), 10 μg/mL TCP (), and 100 μg/mL TCP groups (). (c), (d), (e), (f), (g), and (h) represent the TNF-α, IL-1β, and IL-6 expressions following coculture with 10 μg/mL and 100 μg/mL of C₂S and TCP, respectively, in RAW 264.7 cells after 24 h. The 10 μg/mL C₂S treatment increased the TNF-α expression to a greater extent than TCP (). After the siRNA-TLR2-1 was added, the expression decreased (e). The 100 μg/mL C₂S produced high TNF-α mRNA levels (), which were higher than the 100 μg/mL TCP treatment () (h). The TNF-α, IL-1β, and IL-6 mRNA expression following the 10 μg/mL and 100 μg/mL TCP treatments were even lower than the control group (c, e, f, g, and h). The positive control group produced an obvious increase in TNF-α, IL-1β, and IL-6 mRNA expressions. The data are expressed as the . , , and (experimental group versus control). , , and (experimental group versus control-siRNA). , , and (between the experimental groups).

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