Vascular RAGE transports oxytocin into the brain to elicit its maternal bonding behaviour in mice.

Communications Biology
Yasuhiko YamamotoHaruhiro Higashida

Abstract

Oxytocin sets the stage for childbirth by initiating uterine contractions, lactation and maternal bonding behaviours. Mice lacking secreted oxcytocin (Oxt -/-, Cd38 -/-) or its receptor (Oxtr -/-) fail to nurture. Normal maternal behaviour is restored by peripheral oxcytocin replacement in Oxt -/- and Cd38 -/-, but not Oxtr -/- mice, implying that circulating oxcytocin crosses the blood-brain barrier. Exogenous oxcytocin also has behavioural effects in humans. However, circulating polypeptides are typically excluded from the brain. We show that oxcytocin is transported into the brain by receptor for advanced glycation end-products (RAGE) on brain capillary endothelial cells. The increases in oxcytocin in the brain which follow exogenous administration are lost in Ager -/- male mice lacking RAGE, and behaviours characteristic to abnormalities in oxcytocin signalling are recapitulated in Ager -/- mice, including deficits in maternal bonding and hyperactivity. Our findings show that RAGE-mediated transport is critical to the behavioural actions of oxcytocin associated with parenting and social bonding.

Associated Clinical Trials

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Citations

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Methods Mentioned

BETA
transgenic
nuclear translocation
enzyme immunosorbent assay
chips
Assay
FCS
FACS

Software Mentioned

ANY
maze
Metamorph
FlowJo
AB Sciex Analyst

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