Swietosławski J, Karasek M
Department of Pathological Anatomy, Medical University, Lódź, Poland.
Endokrynol Pol. 1993;44(1):81-7.
The ultrastructure of pinealocytes was studied in Syrian hamsters maintained under 12:12 light: dark cycle, both during the daytime (1300h) and at night (0100h). At night the pinealocytes showed ultrastructural features indicating an increased metabolic and synthetic activity of these cells. It was expressed by higher relative volumes of mitochondria, lysosomes, lipid droplets, granular endoplasmic reticulum and vacuoles containing flocculent material at night in comparison with those during the daytime. By contrast, the number of the dense-core vesicles, both in the cell body and in the endings of pinealocyte processes was higher during the daytime than at night. Quantitative morphological results correlate with the well known nocturnal enhancement in biochemical activity of the pineal gland, especially the circadian rhythm of the secretion of the pineal hormone-melatonin.
在处于12:12光暗循环条件下的叙利亚仓鼠中，研究了白天（13:00）和夜间（01:00）松果体细胞的超微结构。夜间，松果体细胞呈现出超微结构特征，表明这些细胞的代谢和合成活性增强。与白天相比，夜间线粒体、溶酶体、脂滴、颗粒内质网以及含有絮状物质的液泡的相对体积更高，这体现了上述活性增强。相比之下，白天松果体细胞体及其突起末端的致密核心囊泡数量比夜间更多。定量形态学结果与松果体生化活性的夜间增强现象（尤其是松果体激素褪黑素分泌的昼夜节律）相关。
