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Updated: Dec 15, 2025

Murine Drinking Models in the Development of Pharmacotherapies for Alcoholism: Drinking in the Dark and Two-bottle Choice

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Inbred Substrain Differences Influence Neuroimmune Response and Drinking Behavior.

Anna S Warden^1,2,3, Adriana DaCosta¹, Sonia Mason¹

¹From the Waggoner Center for Alcoholism and Addiction Research, The University of Texas at Austin, Austin, Texas, USA.

Alcoholism, Clinical and Experimental Research

|July 9, 2020

Summary

This summary is machine-generated.

Differences in C57BL/6 mouse substrains impact ethanol consumption and immune responses. C57BL/6J mice, with longer-lasting immune reactions to poly(I:C), escalate ethanol intake, unlike C57BL/6N mice.

Keywords:

Alcohol C57BL/6J C57BL/6N Neuroimmune Poly I:C TLR3

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Area of Science:

Neuroscience
Immunology
Genetics

Background:

The C57BL/6 mouse strain is a common model for addiction and immune studies.
Significant variations exist in ethanol consumption and innate immunity between C57BL/6 substrains.

Purpose of the Study:

To investigate how substrain differences in innate immune response affect neuroimmune-induced escalation of voluntary ethanol consumption.
To determine if immune response variations can explain differing ethanol behaviors in C57BL/6 substrains.

Main Methods:

Compared acute innate immune responses to polyinosinic:polycytidylic acid (poly(I:C)) in C57BL/6N and C57BL/6J mice brains via qRT-PCR.
Utilized a neuroimmune escalation model with poly(I:C) to compare ethanol drinking behaviors between substrains.
Assessed brain neuroimmune responses to both ethanol and poly(I:C) in both substrains.

Main Results:

C57BL/6N mice exhibit a brief, robust inflammatory response to poly(I:C), while C57BL/6J mice show a smaller, prolonged response.
Only C57BL/6J mice escalated ethanol intake in the neuroimmune model after poly(I:C) administration.
Enhanced proinflammatory gene expression was observed in C57BL/6J mice following poly(I:C) and ethanol exposure.

Conclusions:

Substrain-specific differences significantly influence innate immune responses and ethanol consumption phenotypes.
Genetic background, specifically substrain, is critical for understanding neuroimmune signaling in ethanol abuse.
Reporting the source and background of mice used in research is crucial for reproducibility.