RAd-IGF-I increases the expression of IL6 and IL-1β and decreases the expression of TLR4 in astrocytes under basal conditions. mRNA levels of IL6 (A,B), IL-1β (C,D), TNF-α (E,F) and TLR4 (G,H) in astrocytes 24 h (A,C,E,G) or 72 h (B,D,F,H) after the addition of RAd-TK/GFP or RAd-IGF-I to the cultures. Data are presented as mean ± SEM and are expressed as percentage of control (uninfected cells) values. *,**,***, Significant differences (* P < 0.05; **P < 0.01; ***P < 0.001) in comparison to the values of uninfected cells. §, §§, §§§, Significant differences (§P < 0.05; §§P < 0.01***; §§§P < 0.001) between RAd-TK/GFP and RAd-IGF-I.