莫桑鼻给非鲫滤泡闭锁中卵黄溶致液晶的形变特征

运用透射电镜的超薄切片技术和冰冻蚀刻复型膜技术研究了莫桑鼻给非鲫滤泡闭锁过程中印黄溶致液晶YLLC的形态变化特征.结果表明、由颗粒细胞吞噬消化卵黄球所形成的YLLC通常是膜片层排列紧密的脂质体样结构,或为膜片层叠加排列的结构以及不规则的同心圆结构.这些YLLC结构不稳定,当被颗粒细胞释放后.因空间的扩大和水份的增加.YLLC吸水膨胀.形成规则的.膜间距增加的稳定脂质体样结构;YLLC能随体液流动,呈流体状.根据YLLC形态变化的行为,作者认为鱼类滤泡闭锁的生物学意义在于清除卵黄中不正常卵母细胞,并且使印黄物质重新吸收利用.但不参与内分泌激素的合成.

MORPHOLOGICAL CHANGES OF YOLK LYOTROPIC LIQUID CRYSTALS DURING FOLLICULAR ATRESIA OF TILAPIA MOSSAMBICA

Using ultrathin section and freeze-etching replica techniques the morphological changes of yolk lyotropic liquid crystals (YLLQ) during follicular atresia of Tilapia mossambica were observed with transmission electron microscope.The YLLQ formed by granulosa cells, which phagocytosized and digested yolk spheres of abnormal oocytes, were liposome-like structures with tightly lamellar layers, or pilled -up lamellar structures without distinct circular centre, or irregular concentric lamellar structres. These YLLQ in the cells were unstable state. After liberated from granulosa cells, YLLQ by themselves, in the enlargement of space and the increase of water, swelled to form a stable and regular liposome-like structure with wide intervals between lamellar layers.The YLLQ can move intercellularly with body liquid and eventually enter the capillary lumen through the fenestrae of endothelia cells. According to the behaviour of morphological changes of YLLC, it is considered that the follicular atresia of teleosts come into operation as a resorption process of yolk materials and does not take part in the steroid synthesis.