Ethanol-induced changes in poly (ADP ribose) polymerase and neuronal developmental gene expression

Area of Science:

• Neuroscience
• Epigenetics
• Developmental Biology

Background:

• Prenatal alcohol exposure significantly impacts neuronal development.
• Poly-ADP Ribose Polymerase (PARP) enzymes are epigenetic regulators involved in DNA modification and gene expression, and are induced by ethanol.

Purpose of the Study:

• To investigate the hypothesis that ethanol-induced PARP activity alters neurodevelopmental gene expression.
• To determine the role of PARP in ethanol-induced epigenetic modifications and gene expression changes in developing neurons.

Main Methods:

• Mouse E18 cortical neurons were treated with ethanol, PARP inhibitors, and PPARγ modulators.
• Assessed PARP activity, mRNA expression of key neurodevelopmental genes (Bdnf, OKSM), DNA methylation/demethylation factors (5mC, 5hmC), and PPARγ promoter binding.

Main Results:

• Ethanol reduced Bdnf and Klf4 mRNA expression while increasing c-Myc; PARP inhibition reversed these changes.
• PARP inhibition increased 5-methylcytosine at the c-Myc promoter, indicating a role in DNA demethylation.
• Inhibition of PARP activity enhanced PPARγ promoter binding, correlating with increased Bdnf and Klf4 mRNA.

Conclusions:

• PARP plays a critical role in mediating ethanol-induced alterations in neurodevelopmental gene expression.
• PARP is involved in DNA demethylation processes and negatively regulates PPARγ promoter binding.
• Targeting PARP activity may offer a therapeutic strategy for mitigating the effects of prenatal alcohol exposure on brain development.