Low-dose UV radiation before running wheel access activates brown adipose tissue
| Autor: | Tamara N. Abel, Vance B. Matthews, Gursimran Kaur Dhamrait, Prue H. Hart, Robyn M. Lucas, Shelley Gorman, Tristan S Allemann, Naomi Fleury |
|---|---|
| Rok vydání: | 2019 |
| Předmět: |
0301 basic medicine
CD36 Antigens Male medicine.medical_specialty Ultraviolet Rays Endocrinology Diabetes and Metabolism CD36 Physical activity 030209 endocrinology & metabolism White adipose tissue Running 03 medical and health sciences Mice 0302 clinical medicine Endocrinology Immune system Adipose Tissue Brown Sodium-Glucose Transporter 2 Internal medicine Physical Conditioning Animal Brown adipose tissue medicine Animals Adiposity biology business.industry Lipase medicine.disease Obesity Fatty Acid Synthase Type I Mice Inbred C57BL 030104 developmental biology medicine.anatomical_structure biology.protein medicine.symptom Steatosis business Weight gain |
| Zdroj: | The Journal of endocrinology. 244(3) |
| ISSN: | 1479-6805 |
| Popis: | In previous preclinical studies, low (non-burning) doses of UV radiation (UVR) limited weight gain and metabolic dysfunction in mice fed with a high-fat diet. Here, we explored the effects of low-dose UVR on physical activity and food intake and mechanistic pathways in interscapular brown adipose tissue (iBAT). Young adult C57Bl/6J male mice, housed as individuals, were fed a high-fat diet and exposed to low-dose UVR (sub-oedemal, 1 kJ/m2 UVB, twice-a-week) or ‘mock’ treatment, with or without running wheel access (2 h, for ‘moderate’ physical activity) immediately after phototherapy. There was no difference in distance run in mice exposed to UVR or mock-treated over 12 weeks of exposure to running wheels (P = 0.14). UVR (alone) did not significantly affect food intake, adiposity, or signs of glucose dysfunction. Access to running wheels increased food intake (after 10 weeks, P ≤ 0.02) and reduced gonadal white adipose tissue and iBAT mass (P ≤ 0.03). Body weight and hepatic steatosis were lowest in mice exposed to UVR with running wheel access. In the iBAT of mice exposed to UVR and running wheels, elevated Atgl, Cd36, Fasn, Igf1, Pparγ, and Ucp1 mRNAs and reduced CD11c on F4-80 + MHC class II+ macrophages were observed, while renal Sglt2 mRNA levels were increased, compared to high-fat diet alone (P ≤ 0.03). Blood levels of 25-hydroxyvitamin D were not increased by exposure to UVR and/or access to running wheels. In conclusion, when combined with physical activity, low-dose UVR may more effectively limit adiposity (specifically, body weight and hepatic steatosis) and modulate metabolic and immune pathways in iBAT. |
| Databáze: | OpenAIRE |
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