ArticlebioRxiv : the preprint server for biology2026
EFFECTS OF TOLL-LIKE RECEPTOR 3 - DEPENDENT IMMUNE ACTIVATION IN MICE ARE SEX- AND TISSUE- SPECIFIC: IMPLICATIONS FOR ALCOHOL USE DISORDER.
Article in bioRxiv : the preprint server for biology, 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
Background: Alcohol use disorder (AUD) is linked to increased neuroinflammation. Alcohol (ethanol) may activate toll-like receptors, which leads to the release of inflammatory molecules that could influence AUD-related behaviors, such as increased alcohol intake. Activation of toll-like receptor 3 (TLR3) by Polyinosinic:polycytidylic acid (Poly(I:C) or PIC) is associated with escalation of alcohol consumption in male, but not female F1 hybrid mice from reciprocal crosses between FVB/NJ (FVB) and C57BL/6J (B6) strains. Little is known about the underlying mechanisms of these sex-specific behavioral effects. In this study, we investigated the effects of TLR3 activation by PIC on temporal profiles of several pro- and anti-inflammatory molecules in the blood and brain of FVB/B6 F1 hybrid male and female mice at multiple time points. We hypothesized that TLR3 - dependent immune profiles would differ between males and females, which may, at least in part, explain the observed differences in drinking behavior. Methods: Male and female FVB/B6 F1 hybrid alcohol-naive mice were injected intraperitoneally with PIC (10 mg/kg) or saline. Blood and perfused brain tissues from the prefrontal cortex (PFC) and striatum were collected at 6-, 24-, and 48-hours post-injection. The expressions of Results: Activation of TLR3 by PIC triggered time-dependent, sex- and tissue-specific responses in immune genes and their proteins. PIC induced a time-dependent increase in expression of majority of the genes peaking at the 6 hr time point. Temporal immune profiles for pro-inflammatory chemokines, Conclusion: Our results revealed distinct TLR3-dependent immune gene and protein expression profiles in blood and brain between males and females and suggested different roles for these molecules in regulating alcohol consumption. We identified CCL2, CCL5 and MMP-9 as target molecules for investigating sex-specific behavior in the immune modulation of alcohol consumption.
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Registered trials
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