Role of the CB2 Cannabinoid Receptor in the Regulation of Food Intake: A Systematic Review
Abstract
:1. Introduction
1.1. The Endocannabinoid System
1.2. Cellular Mechanisms of the CB2 Receptor
2. Methods
2.1. Information Sources and Search Strategy
2.2. Data Extraction and Assessment of Risk of Bias
3. Results
3.1. Search Results
3.2. Risk of Bias Assessment
Study | Q1 | Q2 | Q3 | Q4 | Q5 | Q6 | Q7 | Q8 | Q9 | Q10 |
---|---|---|---|---|---|---|---|---|---|---|
Werner 2003 [62] | ||||||||||
Onaivi 2008 [63] | ||||||||||
Agudo 2010 [64] | ||||||||||
Ishiguro 2010 [65] | ||||||||||
Ting 2015 [66] | ||||||||||
Verty 2015 [58] | ||||||||||
Schmitz 2016 [67] | ||||||||||
Diaz-Rocha 2018 [68] | ||||||||||
Alshaarawy 2019 [69] | ||||||||||
Bi 2019 [70] | ||||||||||
Bourdy 2021 [71] | ||||||||||
De Ceglia 2023 [17] | ||||||||||
Rorato 2023 [72] |
3.3. The Role of the CB2 Cannabinoid Receptor in Food Intake
3.3.1. Administration of CB2 Agonists and Antagonists
3.3.2. Depletion and Expression of the CB2 Receptor
4. Discussion
5. Conclusions
Author Contributions
Funding
Conflicts of Interest
References
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Study | Animal Model Characteristics | Treatment | Results |
---|---|---|---|
Werner 2003 [62] | Male Lewis rats (220–240 g) | Administration (i.c.v.) of antagonist (AM630) at different doses: 2.5, 5, 10, and 25 µg | ↑ Food intake (chow) |
Onaivi 2008 [63] | Male mice: C57Bl/6J, Balb/c, and DBA/2 strains | Acute administration (i.p.) of antagonist (AM630) at 10 mg/kg | The C57BL/6 mice and DBA/s mice ↓ food intake (chow) The Balb/c mice = food intake (chow) |
Agudo 2010 [64] | Male knockout mice (Cb2−/−) and wild-type littermates (Cb2+/+); ages: 2, 6, and 12 months | Wild-type received chronic administration (i.p.) of antagonist (SR 144528) at 3 mg/kg | CB2R knockout mice ↑ food intake (chow) Wild-type mice = food intake (chow) |
Ishiguro 2010 [65] | C57Bl/6J male and female mice | Acute administration (i.p.) of antagonist (AM630) at 10 mg/kg | ↑ Food intake (chow) |
Ting 2015 [66] | Male Sprague Dawley rats (240 to 310 g) | Acute administration (i.p.) of antagonist (AM630) at different doses: 0.3, 1, and 3 mg/kg | ↑ Food intake (chow) |
Verty 2015 [58] | Male C57BL/6 mice (8 weeks old) | Acute administration (i.p.) of agonist (JWH-015) at different doses: 1.0, 5.0, or 10.0 mg/kg. Co-administered of agonist (JWH-015, 10 mg/kg) with antagonist (AM630, 5 mg/kg) | ↓ Food intake (chow) with administration of JWH-015 (10 mg/kg) = food intake (chow) when co-administered agonist and antagonist |
Schmitz 2016 [67] | Male and female knockout mice (Cb2−/−) (1.2–1.8 years old) | CB2 receptor deficiency to study age-associated obesity | ↓ Food intake (chow) CB2−/− mice became obese. |
Dias-Rocha 2018 [68] | Male and female Wistar rats (170 days old) | Maternal high-fat (HF) diet to study effects in rat offspring | ↑ Food preference (high-fat diet) in males and females Females ↑ expression of CB2 receptor |
Alshaarawy 2019 [69] | Male knockout mice (Cb2−/−) (8 weeks old) | 12 weeks on low-fat or high-fat diet | ↑ Weight gain on high-fat diet, but not different from wild-type mice = Food intake (high-fat diet) |
Bi 2019 [70] | Male knockout mice (Cb2−/−) (8 to 14 weeks old) | Acute administration (i.p.) of agonist (JWH-015) at different doses: 10 and 20 mg/ kg | ↓ Sucrose self-administration in wild-type mice, but not knockout mice, with doses of 10 and 20 mg/ kg |
Bourdy 2021 [71] | Male Wistar rats (200 ± 10 g) | 6 weeks of free-choice regimen of high-fat or sugar diet | ↑ Expression of CB2 receptor in NAC due to high sucrose |
De Ceglia 2023 [17] | Adult male Wistar rats (280–300 g) | 40 days of exposure to palatable cafeteria diet | ↑ Expression of CB2 receptor in prefrontal cortex |
Rorato 2023 [72] | Male C57BL mice (7–8 weeks old) | 56 days of exposure to high-fat diet. Chronic administration (i.c.v.) of agonist (HU308) at different doses: 1.0, 5.0, or 10.0 mg/kg | = Food intake (high-fat diet) |
Ligand | Structure | Action Mechanism | pKi on CB2R | CB2R Selectivity * |
---|---|---|---|---|
HU 308 | CB2-selective agonist | 7.15 [73] 7.0 [74] | 12 [73] | |
JWH-015 | Moderately CB2-selective agonist | 6.63 [73] 6.5 [74] | 5 [73] | |
AM 630 | CB2-selective inverse agonist | 7.66 [73] 7.7 [74] | 115 [73] | |
SR144528 | CB2-selective inverse agonist | 10.7 [73,75] 10.5 [74] | 6026 [73] |
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Rodríguez-Serrano, L.M.; Chávez-Hernández, M.E. Role of the CB2 Cannabinoid Receptor in the Regulation of Food Intake: A Systematic Review. Int. J. Mol. Sci. 2023, 24, 17516. https://doi.org/10.3390/ijms242417516
Rodríguez-Serrano LM, Chávez-Hernández ME. Role of the CB2 Cannabinoid Receptor in the Regulation of Food Intake: A Systematic Review. International Journal of Molecular Sciences. 2023; 24(24):17516. https://doi.org/10.3390/ijms242417516
Chicago/Turabian StyleRodríguez-Serrano, Luis Miguel, and María Elena Chávez-Hernández. 2023. "Role of the CB2 Cannabinoid Receptor in the Regulation of Food Intake: A Systematic Review" International Journal of Molecular Sciences 24, no. 24: 17516. https://doi.org/10.3390/ijms242417516