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##s Cysteine ( Cys ) And GSH?

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2. Results
2.1 Ethanol decreases cysteine (Cys) and GSH in Primary Cerebral Cortical Neurons (PCNs) and fetal brains
Fetal rat cerebral cortical neurons were treated with E (4 mg/ml) for 24 h and pregnant dams were treated with the “Binge” model as detailed above. Both of these regimens elevate Nrf2 expression as well as induce enhanced apoptotic death of neurons [5, 7]. To gain a better understanding of the E-induced GSH loss, we first assessed the levels of cysteine, which is one of the key substrates involved in de novo synthesis of GSH. Illustrated in figure 3, both in vivo maternal exposures and the in vitro PCNs treatment with E reduced Cys with a concomitant decrease in the GSH content. Cys was decreased in PCNs and fetal …show more content…

These data suggest that E can impair EAAC1 protein expression and its surface presentation reflecting reduced Cys transport by this system. Figure 3. Effect of ethanol on Cys and GSH levels in PCNs and fetal brain cortices. A representative HPLC chromatogram of Cys in Control and E-treated PCNs (A); The concentration of Cys quantified using standards in PCNs (n=4) (B); Quantification of GSH concentration in control and E-treated PCNs using standards as measured by HPLC (n=4) (C); HPLC-based determination of Cys concentration in fetal brain cortices of binge alcohol exposed pregnant rats (n=7) (D); Fetal brain cortex GSH content following binge alcohol gestational exposure using HPLC (n=4) (E). Values represent the mean ± sem. * p < 0.05 was considered significant for ethanol alone.
2.3 Ethanol-induced reduction of EAAC1 protein is associated with a decrease in its transcript levels
To assess whether the E-induced EAAC1 dysregulation occurs at the transcriptional level, we performed real time qPCR analysis for EAAC1 mRNA expression in E treated PCN and in fetal cerebral cortices exposed to E in utero. Figure 5A illustrates that E exposure (4mg/ml) reduced the EAAC1 transcript expression levels by 27% (p<0.05) as early as 6 h in PCNs. This was further reduced to 49% (p<0.05) at the end of a 24 h exposure (Figure 5A). Similarly, a significant decrease by about 36% (p<0.05)

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