Melatonin activates the vascular elements, telocytes, and neuroimmune communication in the adrenal gland of Soay rams during the non-breeding season
Tóm tắt
The adrenal glands of 15 adult Soay rams were used to study the effect of melatonin on their vascular elements and cellular organization. A significant increase in the cross-sectional area of the blood sinusoids was demonstrated after melatonin administration. The vimentin-expressing mesenchymal cells were increased in the melatonin-treated group. Intensive S-100 protein expression was observed in the sustentacular cells and telocytes (TCs) of the treated groups. Moreover, S-100 protein expressed intensively in the dendritic cells that distributed around the blood sinusoids. Dendritic cells showed positive immunoreactivity for CD8 and CD103. Many dendritic cells with well-defined processes were observed close to the nerve fibers after melatonin administration. A significant increase in the number and diameter of dendritic cells after melatonin treatment was demonstrated. Many highly active TCs were observed in the medulla of the treated group, which were characterized by long telopodes (Tps) containing abundant secretory vesicles that released into the extracellular milieu and towards the dendritic cells. In the melatonin-treated groups, the nerve fibers showed a significant increase in their cross-sectional area accompanied by an increase in the activity of Schwann cells and neighboring dendritic cells. In the treated group, TCs and DCs appear to contribute to angiogenesis. A planner contact between Tps and the stem cell was demonstrated in the treated group. Melatonin induced a stimulatory action on the vascular and neuronal elements of the adrenal gland. Moreover, it enhances the activity of a variety of cells including telocytes, dendritic, sustentacular, and Schwann cells.
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