Maternal Methamphetamine Exposure Influences Behavioral Sensitization and Nucleus Accumbens DNA Methylation in...

Area of Science:

• Neuroscience
• Genetics
• Pharmacology

Background:

• Maternal methamphetamine (METH) exposure can impact offspring, potentially increasing their susceptibility to addiction.
• Epigenetic modifications are linked to addiction, but specific markers for prenatal METH exposure's impact on offspring addiction risk are not well-defined.

Purpose of the Study:

• To investigate the epigenetic signatures associated with prenatal METH exposure and their correlation with addiction-related behavioral sensitization in offspring.
• To determine if maternal METH exposure influences the offspring's response to METH-induced behavioral sensitization.

Main Methods:

• Utilized a mouse model with escalating doses of METH exposure in pregnant F0 female mice.
• Assessed METH-induced behavioral sensitization in male and female offspring.
• Employed whole genome-bisulfite sequencing (WGBS) to analyze DNA methylation in the nucleus accumbens (NAc) of male offspring.

Main Results:

• Male offspring exposed to METH prenatally exhibited enhanced METH-induced behavioral sensitization compared to controls.
• Prenatal METH exposure induced significant genome-wide DNA methylation changes in male offspring.
• Specific differentially methylated cytosines (DMCs) from prenatal METH exposure correlated with those from postnatal METH exposure, with some showing negative correlation and enrichment in neurodevelopment and addiction pathways.

Conclusions:

• Maternal METH exposure establishes epigenetic alterations in offspring that correlate with increased susceptibility to METH-induced behavioral sensitization, particularly in males.
• Identified specific epigenetic markers and genes (e.g., Kirrel3, Lrpprc, Peg3) associated with prenatal METH exposure and addiction risk in offspring.