Melanocortin-3 receptors in the limbic system mediate feeding-related motivational responses during weight loss

Maria Mavrikaki, Clemence Girardet, Andras Kern, Alicia Faruzzi Brantley, Courtney A. Miller, Heather Macarthur, Daniel Marks, Andrew A. Butler

Research output: Contribution to journalArticle

10 Citations (Scopus)

Abstract

Objective: Appetitive responses to weight loss are mediated by a nutrient-sensing neural network comprised of melanocortin neurons. The role of neural melanocortin-3 receptors (MC3R) in mediating these responses is enigmatic. Mc3r knockout mice exhibit a paradoxical phenotype of obesity and reduced feeding-related behaviors in situations of nutrient scarcity. Here we examined whether MC3Rs expressed in mesolimbic neurons regulate feeding-related motivational responses. Methods: Interactions between Mc3r genotype, cognitive function and energy balance on food self-administration were assessed using operant conditioning with fixed- and progressive ratio (FR1/PR1) settings. Inhibition of Mc3r transcription by a loxP-flanked transcriptional blocker (TB) in C57BL/6JN mice (Mc3r TB/TB ) was reversed in mesolimbic neurons using DAT-Cre (DAT-MC3R). Results: Caloric restriction (CR) caused 10-15% weight loss and increased motivation to acquire food rewards during training sessions. c-Fos-expression in the nucleus accumbens was increased 1 h following food presentation. While exhibiting weight loss, total food self-administration, enhanced motivation to self-administer food rewards in training sessions held during CR and c-Fos-activation in the nucleus accumbens following re-feeding were all markedly attenuated in Mc3r TB/TB mice. In contrast, cognitive abilities were normal in Mc3r TB/TB mice. Total food self-administration during FR1 sessions was not rescued in DAT-MC3R mice, however enhanced motivational responses to self-administer food rewards in PR1 conditions were restored. The nutrient-partitioning phenotype observed with Mc3r-deficiency was not rescued in DAT-MC3R mice. Conclusions: Mesolimbic MC3Rs mediate enhanced motivational responses during CR. However, they are insufficient to restore normal caloric loading when food is presented during CR and do not affect metabolic conditions altering nutrient partitioning.

Original languageEnglish (US)
JournalMolecular Metabolism
DOIs
StateAccepted/In press - Apr 1 2016

Fingerprint

Receptor, Melanocortin, Type 3
Limbic System
Weight Loss
Food
Caloric Restriction
Self Administration
Reward
Nucleus Accumbens
Neurons
Motivation
Melanocortins
Operant Conditioning
Phenotype
Aptitude
Feeding Behavior
Inbred C57BL Mouse
Knockout Mice

Keywords

  • Appetite
  • Caloric restriction
  • Dopamine
  • Melanocortin-3 receptors
  • Melanocortins
  • Motivation

ASJC Scopus subject areas

  • Cell Biology
  • Molecular Biology

Cite this

Mavrikaki, M., Girardet, C., Kern, A., Faruzzi Brantley, A., Miller, C. A., Macarthur, H., ... Butler, A. A. (Accepted/In press). Melanocortin-3 receptors in the limbic system mediate feeding-related motivational responses during weight loss. Molecular Metabolism. https://doi.org/10.1016/j.molmet.2016.05.002

Melanocortin-3 receptors in the limbic system mediate feeding-related motivational responses during weight loss. / Mavrikaki, Maria; Girardet, Clemence; Kern, Andras; Faruzzi Brantley, Alicia; Miller, Courtney A.; Macarthur, Heather; Marks, Daniel; Butler, Andrew A.

In: Molecular Metabolism, 01.04.2016.

Research output: Contribution to journalArticle

Mavrikaki, Maria ; Girardet, Clemence ; Kern, Andras ; Faruzzi Brantley, Alicia ; Miller, Courtney A. ; Macarthur, Heather ; Marks, Daniel ; Butler, Andrew A. / Melanocortin-3 receptors in the limbic system mediate feeding-related motivational responses during weight loss. In: Molecular Metabolism. 2016.
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abstract = "Objective: Appetitive responses to weight loss are mediated by a nutrient-sensing neural network comprised of melanocortin neurons. The role of neural melanocortin-3 receptors (MC3R) in mediating these responses is enigmatic. Mc3r knockout mice exhibit a paradoxical phenotype of obesity and reduced feeding-related behaviors in situations of nutrient scarcity. Here we examined whether MC3Rs expressed in mesolimbic neurons regulate feeding-related motivational responses. Methods: Interactions between Mc3r genotype, cognitive function and energy balance on food self-administration were assessed using operant conditioning with fixed- and progressive ratio (FR1/PR1) settings. Inhibition of Mc3r transcription by a loxP-flanked transcriptional blocker (TB) in C57BL/6JN mice (Mc3r TB/TB ) was reversed in mesolimbic neurons using DAT-Cre (DAT-MC3R). Results: Caloric restriction (CR) caused 10-15{\%} weight loss and increased motivation to acquire food rewards during training sessions. c-Fos-expression in the nucleus accumbens was increased 1 h following food presentation. While exhibiting weight loss, total food self-administration, enhanced motivation to self-administer food rewards in training sessions held during CR and c-Fos-activation in the nucleus accumbens following re-feeding were all markedly attenuated in Mc3r TB/TB mice. In contrast, cognitive abilities were normal in Mc3r TB/TB mice. Total food self-administration during FR1 sessions was not rescued in DAT-MC3R mice, however enhanced motivational responses to self-administer food rewards in PR1 conditions were restored. The nutrient-partitioning phenotype observed with Mc3r-deficiency was not rescued in DAT-MC3R mice. Conclusions: Mesolimbic MC3Rs mediate enhanced motivational responses during CR. However, they are insufficient to restore normal caloric loading when food is presented during CR and do not affect metabolic conditions altering nutrient partitioning.",
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AU - Mavrikaki, Maria

AU - Girardet, Clemence

AU - Kern, Andras

AU - Faruzzi Brantley, Alicia

AU - Miller, Courtney A.

AU - Macarthur, Heather

AU - Marks, Daniel

AU - Butler, Andrew A.

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N2 - Objective: Appetitive responses to weight loss are mediated by a nutrient-sensing neural network comprised of melanocortin neurons. The role of neural melanocortin-3 receptors (MC3R) in mediating these responses is enigmatic. Mc3r knockout mice exhibit a paradoxical phenotype of obesity and reduced feeding-related behaviors in situations of nutrient scarcity. Here we examined whether MC3Rs expressed in mesolimbic neurons regulate feeding-related motivational responses. Methods: Interactions between Mc3r genotype, cognitive function and energy balance on food self-administration were assessed using operant conditioning with fixed- and progressive ratio (FR1/PR1) settings. Inhibition of Mc3r transcription by a loxP-flanked transcriptional blocker (TB) in C57BL/6JN mice (Mc3r TB/TB ) was reversed in mesolimbic neurons using DAT-Cre (DAT-MC3R). Results: Caloric restriction (CR) caused 10-15% weight loss and increased motivation to acquire food rewards during training sessions. c-Fos-expression in the nucleus accumbens was increased 1 h following food presentation. While exhibiting weight loss, total food self-administration, enhanced motivation to self-administer food rewards in training sessions held during CR and c-Fos-activation in the nucleus accumbens following re-feeding were all markedly attenuated in Mc3r TB/TB mice. In contrast, cognitive abilities were normal in Mc3r TB/TB mice. Total food self-administration during FR1 sessions was not rescued in DAT-MC3R mice, however enhanced motivational responses to self-administer food rewards in PR1 conditions were restored. The nutrient-partitioning phenotype observed with Mc3r-deficiency was not rescued in DAT-MC3R mice. Conclusions: Mesolimbic MC3Rs mediate enhanced motivational responses during CR. However, they are insufficient to restore normal caloric loading when food is presented during CR and do not affect metabolic conditions altering nutrient partitioning.

AB - Objective: Appetitive responses to weight loss are mediated by a nutrient-sensing neural network comprised of melanocortin neurons. The role of neural melanocortin-3 receptors (MC3R) in mediating these responses is enigmatic. Mc3r knockout mice exhibit a paradoxical phenotype of obesity and reduced feeding-related behaviors in situations of nutrient scarcity. Here we examined whether MC3Rs expressed in mesolimbic neurons regulate feeding-related motivational responses. Methods: Interactions between Mc3r genotype, cognitive function and energy balance on food self-administration were assessed using operant conditioning with fixed- and progressive ratio (FR1/PR1) settings. Inhibition of Mc3r transcription by a loxP-flanked transcriptional blocker (TB) in C57BL/6JN mice (Mc3r TB/TB ) was reversed in mesolimbic neurons using DAT-Cre (DAT-MC3R). Results: Caloric restriction (CR) caused 10-15% weight loss and increased motivation to acquire food rewards during training sessions. c-Fos-expression in the nucleus accumbens was increased 1 h following food presentation. While exhibiting weight loss, total food self-administration, enhanced motivation to self-administer food rewards in training sessions held during CR and c-Fos-activation in the nucleus accumbens following re-feeding were all markedly attenuated in Mc3r TB/TB mice. In contrast, cognitive abilities were normal in Mc3r TB/TB mice. Total food self-administration during FR1 sessions was not rescued in DAT-MC3R mice, however enhanced motivational responses to self-administer food rewards in PR1 conditions were restored. The nutrient-partitioning phenotype observed with Mc3r-deficiency was not rescued in DAT-MC3R mice. Conclusions: Mesolimbic MC3Rs mediate enhanced motivational responses during CR. However, they are insufficient to restore normal caloric loading when food is presented during CR and do not affect metabolic conditions altering nutrient partitioning.

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KW - Caloric restriction

KW - Dopamine

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KW - Motivation

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