Abstract
Purpose
During obesity, the adipose tissue is usually infiltrated by immune cells which are related to hallmarks of obesity such as systemic inflammation and insulin resistance (IR). Green tea (GT) has been widely studied for its anti-inflammatory actions, including the modulation in the proliferation and activity of immune cells, in addition to preventing cardiovascular and metabolic diseases.
Methods
The aim of the present study was to analyze the population of immune cells present in the subcutaneous and epididymal white adipose tissue (WAT) of mice kept at thermoneutrality (TN) and fed with a high-fat diet (HFD) for 16 weeks, supplemented or not with GT extract (500 mg/kg/12 weeks).
Results
The HFD in association with TN has induced chronic inflammation, and IR in parallel with changes in the profile of immune cells in the subcutaneous and epidydimal WAT, increasing pro-inflammatory cytokines release, inflammatory cells infiltration, and fibrotic aspects in WAT. On the other hand, GT prevented body weight gain, in addition to avoiding IR and inflammation, and the consequent tissue fibrosis, maintaining a lower concentration of cytokines and a profile of immune cells similar to the control mice, preventing the harmful modulations induced by both HFD and TN.
Conclusions
GT beneficial effects in WAT abrogated the deleterious effects triggered by HFD and TN, maintaining all immune cells and fibrotic markers at the same level as in lean mice. These results place WAT immune cells population as a potential target of GT action, also highlighting the positive effects of GT in obese mice housed at TN.
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Acknowledgements
The authors are indebted to the assistance of Dr. Alexandre Steiner and Dr. Eduardo H. Moretti, for indirect calorimeter machine utilization and support, and to all Otton’s Lab members for helping in mice care. The authors are grateful to Alembert Eistein Lino Alvarado for technical assistance in picrosirius staining analyses. This research was supported by the São Paulo Research Foundation (FAPESP, process no. 2019/10616-5), Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)—Finance Code 001 and Cruzeiro do Sul University.
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Tognolli, K., Silva, V., Sousa-Filho, C.P.B. et al. Green tea beneficial effects involve changes in the profile of immune cells in the adipose tissue of obese mice. Eur J Nutr 62, 321–336 (2023). https://doi.org/10.1007/s00394-022-02963-3
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DOI: https://doi.org/10.1007/s00394-022-02963-3