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When chocolate seeking becomes compulsion: gene-environment interplay.

Patrono E, Di Segni M, Patella L, Andolina D, Valzania A, Latagliata EC, Felsani A, Pompili A, Gasbarri A, Puglisi-Allegra S, Ventura R - PLoS ONE (2015)

Bottom Line: This behavioral pattern is linked to decreased availability of accumbal D2R.These findings confirm the function of gene-environment interplay in the manifestation of compulsive eating and support the hypothesis that low accumbal D2R availability is a "constitutive" genetic risk factor for compulsion-like eating behavior.Finally, D2R upregulation and α1R downregulation in the striatum and medial prefrontal cortex, respectively, are potential neuroadaptive responses that parallel the shift from motivated to compulsive eating.

View Article: PubMed Central - PubMed

Affiliation: Department of Applied Clinical Science and Biotechnology, University of L'Aquila, Coppito, Italy.

ABSTRACT

Background: Eating disorders appear to be caused by a complex interaction between environmental and genetic factors, and compulsive eating in response to adverse circumstances characterizes many eating disorders.

Materials and methods: We compared compulsion-like eating in the form of conditioned suppression of palatable food-seeking in adverse situations in stressed C57BL/6J and DBA/2J mice, two well-characterized inbred strains, to determine the influence of gene-environment interplay on this behavioral phenotype. Moreover, we tested the hypothesis that low accumbal D2 receptor (R) availability is a genetic risk factor of food compulsion-like behavior and that environmental conditions that induce compulsive eating alter D2R expression in the striatum. To this end, we measured D1R and D2R expression in the striatum and D1R, D2R and α1R levels in the medial prefrontal cortex, respectively, by western blot.

Results: Exposure to environmental conditions induces compulsion-like eating behavior, depending on genetic background. This behavioral pattern is linked to decreased availability of accumbal D2R. Moreover, exposure to certain environmental conditions upregulates D2R and downregulates α1R in the striatum and medial prefrontal cortex, respectively, of compulsive animals. These findings confirm the function of gene-environment interplay in the manifestation of compulsive eating and support the hypothesis that low accumbal D2R availability is a "constitutive" genetic risk factor for compulsion-like eating behavior. Finally, D2R upregulation and α1R downregulation in the striatum and medial prefrontal cortex, respectively, are potential neuroadaptive responses that parallel the shift from motivated to compulsive eating.

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Related in: MedlinePlus

Expression of DA and NE Receptors in naïve C57 and DBA animals.Expression of D1R and D2R in CP and NAc (A) and D1R, D2R, and α1 in mpFC (B) of naïve C57/DBA groups (n = 6 for each group). ** p<0.01 in comparison with naïve group of the other strain. Data are shown as relative ratio ± SE.
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pone.0120191.g007: Expression of DA and NE Receptors in naïve C57 and DBA animals.Expression of D1R and D2R in CP and NAc (A) and D1R, D2R, and α1 in mpFC (B) of naïve C57/DBA groups (n = 6 for each group). ** p<0.01 in comparison with naïve group of the other strain. Data are shown as relative ratio ± SE.

Mentions: In order to evaluate the baseline receptors availability of α1R, D1R and D2R, the expression of α1R, D1R and D2R in the mpFC as well as D1R and D2R in the NAc and CP was evaluated in two different groups of naïve animals of both strains (naïve C57 and naïve DBA) (Fig. 7).


When chocolate seeking becomes compulsion: gene-environment interplay.

Patrono E, Di Segni M, Patella L, Andolina D, Valzania A, Latagliata EC, Felsani A, Pompili A, Gasbarri A, Puglisi-Allegra S, Ventura R - PLoS ONE (2015)

Expression of DA and NE Receptors in naïve C57 and DBA animals.Expression of D1R and D2R in CP and NAc (A) and D1R, D2R, and α1 in mpFC (B) of naïve C57/DBA groups (n = 6 for each group). ** p<0.01 in comparison with naïve group of the other strain. Data are shown as relative ratio ± SE.
© Copyright Policy
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4363151&req=5

pone.0120191.g007: Expression of DA and NE Receptors in naïve C57 and DBA animals.Expression of D1R and D2R in CP and NAc (A) and D1R, D2R, and α1 in mpFC (B) of naïve C57/DBA groups (n = 6 for each group). ** p<0.01 in comparison with naïve group of the other strain. Data are shown as relative ratio ± SE.
Mentions: In order to evaluate the baseline receptors availability of α1R, D1R and D2R, the expression of α1R, D1R and D2R in the mpFC as well as D1R and D2R in the NAc and CP was evaluated in two different groups of naïve animals of both strains (naïve C57 and naïve DBA) (Fig. 7).

Bottom Line: This behavioral pattern is linked to decreased availability of accumbal D2R.These findings confirm the function of gene-environment interplay in the manifestation of compulsive eating and support the hypothesis that low accumbal D2R availability is a "constitutive" genetic risk factor for compulsion-like eating behavior.Finally, D2R upregulation and α1R downregulation in the striatum and medial prefrontal cortex, respectively, are potential neuroadaptive responses that parallel the shift from motivated to compulsive eating.

View Article: PubMed Central - PubMed

Affiliation: Department of Applied Clinical Science and Biotechnology, University of L'Aquila, Coppito, Italy.

ABSTRACT

Background: Eating disorders appear to be caused by a complex interaction between environmental and genetic factors, and compulsive eating in response to adverse circumstances characterizes many eating disorders.

Materials and methods: We compared compulsion-like eating in the form of conditioned suppression of palatable food-seeking in adverse situations in stressed C57BL/6J and DBA/2J mice, two well-characterized inbred strains, to determine the influence of gene-environment interplay on this behavioral phenotype. Moreover, we tested the hypothesis that low accumbal D2 receptor (R) availability is a genetic risk factor of food compulsion-like behavior and that environmental conditions that induce compulsive eating alter D2R expression in the striatum. To this end, we measured D1R and D2R expression in the striatum and D1R, D2R and α1R levels in the medial prefrontal cortex, respectively, by western blot.

Results: Exposure to environmental conditions induces compulsion-like eating behavior, depending on genetic background. This behavioral pattern is linked to decreased availability of accumbal D2R. Moreover, exposure to certain environmental conditions upregulates D2R and downregulates α1R in the striatum and medial prefrontal cortex, respectively, of compulsive animals. These findings confirm the function of gene-environment interplay in the manifestation of compulsive eating and support the hypothesis that low accumbal D2R availability is a "constitutive" genetic risk factor for compulsion-like eating behavior. Finally, D2R upregulation and α1R downregulation in the striatum and medial prefrontal cortex, respectively, are potential neuroadaptive responses that parallel the shift from motivated to compulsive eating.

Show MeSH
Related in: MedlinePlus