Inflammation features of brown adipose tissue of rats with diet-induced obesity development after different regimes of melatonin administration

O. Kalmukova, Y. Leonova, O. Savchuk, N. Skrypnyk, M. Dzerzhynsky
Taras Shevchenko National University of Kyiv, Kyiv; Taras Shevchenko National University of Kyiv, Kyiv; Taras Shevchenko National University of Kyiv, Kyiv; Taras Shevchenko National University of Kyiv, Kyiv; Taras Shevchenko National University of Kyiv, Kyiv

Abstract


One of the prominent obesity-related changes is the development of systemic low-grade proinflammatory state. Brown adipose tissue (BAT) may serve as a potential target for activation by melatonin to facilitate heat  production and simultaneously stimulate lipolysis during obesity development. At the same time, melatonin is known to have immunomodulatory properties, which are performed via endocrine and paracrine signal pathways in variety cell types (including brown adipocytes)and change significantly during the day. Therefore, it can be used in a wide range of doses and at different times of the day (chronotherapeutic approach). Thus, the main goal of our research was to analyze the inflammation state of brown adipose tissue of rats during high-calorie diet induced-obesity development after different daily melatonin application in different regimes. Melatonin was administered by gavage for 7 weeks in dose 30 mg/kg 1 h before lights-off (HCD ZT11, M ZT11, evening),
or 1 h after lights-on (HCD ZT01, M ZT01, morning). Tissue collagen content and leukocyte infiltration levels in BAT, detected by Van Gieson trichrome staining, were used as markers for the assessment of BAT inflammation state BAT. Propagation of obesity resulted in the increase of BATfibrosis level (the relative area occupied by collagen fibers) and tissue leukocyte infiltration in comparison to control rats. BAT fibrosis level after melatonin administrations to obese rats of HCD ZT01 and HCD ZT11 groups decreased to control values. Similar effects were observedinBAT tissue leukocyte infiltration after both regimes (HCD ZT01 and HCD ZT11 groups) of melatonin intake: this parameter decreased significantly, comparing to obese rats, but was still elevated, comparing to controls. At the same time, melatonin treatmentin morning or evening regimes did not have any impact on BAT fibrosis propagation and leukocyte infiltration in animals that consumed standard diet (M ZT01 and M ZT11 groups). To sum up, we suggest corrective properties of melatonin in context of chronic low-grade inflammation in obese rats BAT and suppose its wide potential for the therapeutic use combined with virtually absent side effects on BAT histophysiology of non-obese rats.

Keywords


chronobiology, histochemistry, brown adipocytes, fibrosis, leukocyte infiltration, high-calorie diet-induced obesity

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Received: 06.09.2021

Revised: 06.10.2021

Signed for publishing: 08.10.2021




DOI: http://dx.doi.org/10.17721/1728_2748.2021.86.28-33

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