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Sex differences in NMDA receptor expression in human alcoholics
Justin P Ridge1, Ada M-C Ho, Peter R Dodd
1School of Chemistry and Molecular Biosciences, University of Queensland, St Lucia, Brisbane, Australia.
Alcohol and Alcoholism (Oxford, Oxfordshire)
|September 9, 2009
Summary
Chronic alcohol misuse significantly lowers N-methyl-d-aspartate (NMDA) receptor subunit expression in the brain, particularly in cirrhotic individuals. Sex and genetic factors further influence these changes, impacting brain damage susceptibility.
Area of Science:
- Neuroscience
- Genetics
- Toxicology
Background:
- Chronic alcohol misuse is a significant public health concern with known neurotoxic effects.
- N-methyl-d-aspartate (NMDA) receptors play crucial roles in synaptic plasticity and neuronal function.
- Alterations in NMDA receptor subunit expression may underlie alcohol-induced brain damage.
Purpose of the Study:
- To investigate the impact of chronic alcohol misuse on NMDA receptor subunit mRNA expression in human brain tissue.
- To determine if sex influences NMDA receptor subunit expression in alcoholics.
- To examine the role of comorbid cirrhosis in alcohol-related changes to NMDA receptor expression.
Main Methods:
- Autopsy-obtained superior frontal cortex (SFC) and primary motor cortex (PMC) tissue from chronic alcoholics and controls.
- Real-time RT-PCR assay for NR1, NR2A, and NR2B NMDA receptor subunit mRNA, normalized to GAPDH.
- Analysis of effects of comorbid cirrhosis, sex, and specific gene polymorphisms (mu-opiate receptor, 5HT1B).
Main Results:
- Significantly lower expression of NR1, NR2A, and NR2B subunits in cirrhotic alcoholics compared to controls and non-cirrhotic alcoholics.
- NMDA subunit expression was influenced by subject sex and genotype.
- Mu-opiate receptor polymorphism modulated NMDA transcript expression in cirrhotic alcoholic SFC, with greater effects on NR1 and NR2A.
- 5HT1B genotypes differentially affected NMDA mRNA expression in male and female SFC of cirrhotic alcoholics.
Conclusions:
- Chronic alcohol misuse, especially with cirrhosis, leads to reduced NMDA receptor subunit expression in specific brain regions.
- Sex and genetic variations interact with alcohol's effects on NMDA receptors.
- Differential NMDA receptor subunit expression may contribute to varied susceptibility to brain damage in male and female cirrhotic alcoholics.
