摘要
本研究用大剂量苯甲酸雌二醇,诱导性成熟前SD大鼠的胸腺迅速退化,可见皮质明显变薄,皮、髓质比例降低,皮质内淋巴细胞大量减少。电镜下见胸腺的上皮性网状细胞(ERC)为一异质性细胞群,它们对雌二醇的反应性也各不相同。其典型的改变为:1.一部分明ERC呈明显的退行性变;2.另一部分明ERC内则充满低电子密度的囊泡;3.暗ERC明显增多,该细胞胞体及其突起的周围,都有许多胶原原纤维。血管周围间隙内也呈类似改变。淋巴细胞的超微结构虽未见异常,但胸腺内酸性非特异性酯酶(ANAE)阳性的T细胞数,明显低于对照组。胸腺皮质内有大量浆细胞聚集,其粗面内质网多高度扩张。本文在上述形态学观察基础上,就雌二醇诱导胸腺退化的机制进行了讨论。
Rapid involution of the thymus was induced in SD rats after administration of high-dose estradiol benzoate. The prominent histological changes observed were as follows: (1) the thymic cortex was become thinner; (2) the corticomedullary ratio was decreased; and (3) a substantial loss of cortical lymphocytes occurred. As a consequence, marked reduction in thymus weight was caused. Under electron microscope, the epithelial reticular cells (ERCs) were found, to be a heterogenous cell group. Their responses to high-dose estradiol were different from each other, and the distinctive changes observed were: (1) cell degeneration changes in some pale ERCs were observed; (2) the other pale ERCs were found to be filled with lower density vacuoles which were very similar to secretory vacuoles; and (3) the dark ERCs were inereased obviously, and many collagen fibril bundles were seen in the vicinity of their perikarya or wrapped by their cytoplasmic processes. There were no striking ultrastructural changes in thymocytes. However, the number of ANAE positive cells in the experimental group was lower than that of the controls evidently. In addition, a large number of plasma cells were observed in the cortex of the experimental group. Based on the above mentioned observations, the possible mechanism of the estradiol effect on the thymus involution was discussed.
出处
《解剖学报》
CAS
CSCD
北大核心
1992年第1期73-77,共5页
Acta Anatomica Sinica
关键词
胸腺退化
雌二醇
ERC
Epithelial reticular cell
Thymus involution
Estradiol
