Abstract
The endocannabinoid system is dysregulated during obesity in tissues involved in the control of food intake and energy metabolism. We examined the effect of chronic exercise on the tissue levels of endocannabinoids (eCBs) and on the expression of genes coding for cannabinoid receptor 1 (CB1) and cannabinoid receptor 2 (CB2) (Cnr1 and Cnr2, respectively) in the subcutaneous (SAT) and visceral adipose tissues and in the soleus and extensor digitorim longus (EDL) muscles, in rats fed with standard or high-fat diet. Twenty-eight male Wistar rats were placed on high-fat diet or standard diet (HFD and Ctl groups, respectively) during 12 weeks whereafter half of each group was submitted to an exercise training period of 12 weeks (HFD + training and Ctl + training). Tissue levels of eCBs were measured by LC-MS while expressions of genes coding for CB1 and CB2 receptors were investigated by qPCR. High-fat diet induced an increase in anandamide (AEA) levels in soleus and EDL (p < 0.02). In soleus of the HFD group, these changes were accompanied by elevated Cnr1 messenger RNA (mRNA) levels (p < 0.05). In EDL, exercise training allowed to reduce significantly this diet-induced AEA increase (p < 0.005). 2-Arachidonoylglycerol (2-AG) levels were decreased and increased by high-fat diet in SAT and EDL, respectively (p < 0.04), but not affected by exercise training. Unlike the HFD + training group, 2-AG levels in soleus were also decreased in the HFD group compared to Ctl (p < 0.04). The levels of eCBs and Cnr1 expression are altered in a tissue-specific manner following a high-fat diet, and chronic exercise reverses some of these alterations.
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Abbreviations
- 2-AG:
-
2-Arachidonoylglycerol
- ABHD4:
-
α/β-Hydrolase 4
- Abhd4 :
-
α/β-Hydrolase 4 gene
- ABHD6:
-
α/β-Hydrolase 6
- Abhd6 :
-
α/β-Hydrolase 6 gene
- ABHD12:
-
α/β-Hydrolase 12
- Abhd12 :
-
α/β-Hydrolase 12 gene
- AEA:
-
Anandamide
- CB1:
-
Cannabinoid receptor 1
- CB2:
-
Cannabinoid receptor 2
- Cnr1 :
-
Cannabinoid receptor 1 gene
- Cnr2 :
-
Cannabinoid receptor 2 gene
- Ctl:
-
Control group
- Ctl + training:
-
Exercise training + standard diet group
- DAGL-α:
-
Diacylglycerol lipase α
- Dagl-α :
-
Diacylglycerol lipase α gene
- DAGL-β:
-
Diacylglycerol lipase β
- Dagl-β :
-
Diacylglycerol lipase β gene
- DIO:
-
Diet-induced obesity
- eCBs:
-
Endocannabinoids
- ECS:
-
Endocannabinoid system
- EDL:
-
Extensor digitorum longus
- EDTA:
-
Ethylenediaminetetraacetic acid
- FAAH:
-
Fatty acid amide hydrolase
- Faah :
-
Fatty acid amide hydrolase gene
- GDE-1:
-
Glycerophosphodiesterase 1
- Gde-1 :
-
Glycerophosphodiesterase 1 gene
- HFD:
-
High-fat diet group
- HFD + training:
-
Exercise training + high-fat diet group
- MAGL:
-
Monoacylglycerol lipase
- Magl :
-
Monoacylglycerol lipase gene
- MAV:
-
Maximal aerobic velocity
- NAPE-PLD:
-
N-acyl phosphatidylethanolamine phospholipase D
- Nape-pld :
-
N-acyl phosphatidylethanolamine phospholipase D gene
- OEA:
-
N-oleylethanolamine
- OGTT:
-
Oral glucose tolerance test
- PEA:
-
N-palmitoyl-ethanolamine
- PPAR:
-
Peroxisome proliferator-activated receptor
- PTPN-22:
-
Protein tyrosine phosphatase N22
- Ptpn-22 :
-
Protein tyrosine phosphatase N22 gene
- PUFA:
-
Polyunsaturated fatty acids
- SAT:
-
Subcutaneous adipose tissue
- RNA:
-
Ribonucleic acid
- mRNA:
-
Messenger RNA
- TRPV1:
-
Transient receptor potential cation channel subfamily V member 1
- Trpv1 :
-
Transient receptor potential cation channel subfamily V member 1 gene
- VAT:
-
Visceral adipose tissue
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Acknowledgments
The authors thank P. Barbez, E. Leclair, and J. Gamain for their advices and technical assistances.
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This research did not receive any specific grant from any funding agency in the public, commercial, or not-for-profit sector.
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Vincenzo Di Marzo and Elsa Heyman share the senior authorship.
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Gamelin, FX., Aucouturier, J., Iannotti, F.A. et al. Effects of chronic exercise on the endocannabinoid system in Wistar rats with high-fat diet-induced obesity. J Physiol Biochem 72, 183–199 (2016). https://doi.org/10.1007/s13105-016-0469-5
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DOI: https://doi.org/10.1007/s13105-016-0469-5