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Within this system, glutathione S-transferases (GSTs) play important roles in maintaining http://www.selleckchem.com/products/Adrucil(Fluorouracil).html cellular redox balance by catalysing the conjugation of GSH to electrophiles in a wide variety of substances, including peroxides (Coles & Ketterer, 1990). Previous work by Xia et al. (1993) showed that in a variety of human cells, expression of GSTP1-1 is suppressed by RA as a result of decreased transcription. Prompted by these findings, we utilized quantitative real-time RT-PCR to test whether RA could affect the glutathione redox potential by suppressing GSTP1-1 expression. Our results showed no differences in GSTP1-1 mRNA levels in HESC treated with vehicle control, TPA, RA, or RA + TPA under culture conditions (as described in legend to Fig. 1) that showed marked induction of VEGF secretion in our functional studies (data not shown). To further evaluate the effects of our treatments on the GSH system, intracellular GSH and its oxidized form, glutathione disulfide (GSSG), were measured. In HESC, concentrations of GSH and GSSG at time 0 min were 3.5 �� 0.4 mm and 165 �� 14 ��m, respectively. Calculation of the GSH/GSSG redox potential (Eh) using these calculations yielded a mean Eh of ?230 �� 4 mV. Treatment with TPA over 120 min did not significantly increase GSH/GSSG Eh (Fig. 7). RA exposure induced a significant oxidation of GSH; after 120 min it measured ?216.5 �� 2.1 mV and constituted an increase of +17 mV (P http://en.wikipedia.org/wiki/MERTK Combined treatments of RA and TPA also demonstrated a significant oxidation of GSH/GSSG Eh, increasing to ?213.8 �� 3.0 mV (an increase of +20 mV from untreated, P http://www.selleckchem.com/products/SRT1720.html and a transcriptional regulator (Watson et al. 2004). The Trx1 redox state is independently regulated from the GSH/GSSG Eh, suggesting that there are elements and pathways that are primarily regulated by Trx1 and others by GSH (Go et al. 2006). To further understand the nature of RA-mediated ROS signalling, we evaluated the effects of RA on the Trx1 Eh as well (Fig. 8). Although H2O2 dramatically oxidized Trx1, its Eh remained unchanged after 120 min of exposure with TPA, RA or TPA + RA, suggesting that mediation of the RA signal does not occur via the Trx1 system.