Fig. 3.

Analysis of the effects of 10 nM retinoid treatment on SH-SY5Y cells according to CYP26A1 and RARβ RNA levels by RT-qPCR. SH-SY5Y cells were treated with 10 nM retinoids for 24 h. RNA was isolated and a) CYP26A1 or b) RARβ RNA analysed by qPCR. CYP26A1 and RARβ RNA levels were standardised with respect to the GAPDH RNA control and compared to levels in control untreated cells (CT) which were set at 1. Shown are mean values of three independent experiments analysed in triplicate. Error bars are SEM (* p < 0.05; ** p < 0.01, one-way ANOVA with Newman-Keuls multiple comparison test). Several of the tested RAR and RXR ligands increased the expression levels of CYP26A1 and RARβ genes significantly above control indicative of transcriptional activity, however, few were more potent than ATRA