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Dietary triglycerides act on mesolimbic structures to regulate the rewarding and motivational aspects of feeding.

Abstract：

:Circulating triglycerides (TGs) normally increase after a meal but are altered in pathophysiological conditions, such as obesity. Although TG metabolism in the brain remains poorly understood, several brain structures express enzymes that process TG-enriched particles, including mesolimbic structures. For this reason, and because consumption of high-fat diet alters dopamine signaling, we tested the hypothesis that TG might directly target mesolimbic reward circuits to control reward-seeking behaviors. We found that the delivery of small amounts of TG to the brain through the carotid artery rapidly reduced both spontaneous and amphetamine-induced locomotion, abolished preference for palatable food and reduced the motivation to engage in food-seeking behavior. Conversely, targeted disruption of the TG-hydrolyzing enzyme lipoprotein lipase specifically in the nucleus accumbens increased palatable food preference and food-seeking behavior. Finally, prolonged TG perfusion resulted in a return to normal palatable food preference despite continued locomotor suppression, suggesting that adaptive mechanisms occur. These findings reveal new mechanisms by which dietary fat may alter mesolimbic circuit function and reward seeking.

journal_name

Mol Psychiatry

journal_title

Molecular psychiatry

authors

Cansell C,Castel J,Denis RG,Rouch C,Delbes AS,Martinez S,Mestivier D,Finan B,Maldonado-Aviles JG,Rijnsburger M,Tschöp MH,DiLeone RJ,Eckel RH,la Fleur SE,Magnan C,Hnasko TS,Luquet S

doi

10.1038/mp.2014.31

subject

Has Abstract

pub_date

2014-10-01 00:00:00

pages

1095-105

issue

10

eissn

1359-4184

issn

1476-5578

pii

mp201431

journal_volume

19

pub_type

杂志文章

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