Silencing synaptic MicroRNA-411 reduces voluntary alcohol consumption in mice

Area of Science:

• Neuroscience
• Molecular Biology
• Genetics

Background:

• Chronic alcohol consumption alters brain microRNA (miRNA) and messenger RNA (mRNA) levels.
• The specific miRNAs and their mRNA targets involved in alcohol's effects on cellular function and behavior remain largely unknown.
• Understanding these molecular mechanisms is crucial for developing targeted interventions for alcohol use disorder.

Purpose of the Study:

• To investigate the in vivo manipulation of alcohol-responsive microRNAs as potential targets to reduce alcohol consumption.
• To examine the role of microRNA-411 (miR-411) in regulating alcohol intake and related behaviors.

Main Methods:

• In vivo silencing of miR-411 using antagomiR-411 infusion into the prefrontal cortex of female C57BL/6J mice.
• Assessment of alcohol consumption, preference, total fluid intake, saccharin consumption, and anxiety-related behaviors.
• Analysis of miR-411 levels, miR-411-Argonaute2 association, and target mRNA (Faah, Ppard) and protein (AMPA-2) expression.

Main Results:

• Silencing miR-411 significantly reduced alcohol consumption and preference in mice with prior alcohol exposure, indicating a neuroadaptive, alcohol-dependent effect.
• AntagomiR-411 did not alter total fluid intake, saccharin consumption, or anxiety-related behaviors, suggesting specificity.
• AntagomiR-411 decreased miR-411 levels and its association with Argonaute2, while increasing Faah and Ppard mRNA and neuronal AMPA-2 protein expression.

Conclusions:

• Alcohol and miR-411 appear to function antagonistically in a homeostatic manner to regulate synaptic mRNA and protein levels.
• Reversing alcohol-induced neuroadaptations via miR-411 manipulation may reduce chronic alcohol consumption.
• miR-411 represents a promising therapeutic target for mitigating alcohol use disorder.