Wharton D A
Department of Zoology, University of Otago, Dunedin, New Zealand.
Parasitology. 1991 Dec;103 Pt 3:413-20. doi: 10.1017/s003118200005993x.
Ultrastructural changes associated with exsheathment of the infective juveniles of Haemonchus contortus are described. Hyaline ring formation occurs associated with annulations 10 and 20 and consists of the dissolution of the basal zone and the inner electron-dense layer resulting in the rupture of the sheath. These changes are consistent with the action of a protease-exsheathing enzyme. There is a significant reduction associated with exsheathment in the size of the excretory cells and the number of excretory granules contained within them. No changes in the oesophagus were observed associated with exsheathment. These, and the observations of earlier workers, suggest that it is the excretory cells and not the oesophagus which are the source of exsheathing fluid during exsheathment.
本文描述了与捻转血矛线虫感染性幼虫脱鞘相关的超微结构变化。透明环的形成与第10和第20个环纹有关，由基底层和内部电子致密层的溶解导致鞘破裂。这些变化与蛋白酶脱鞘酶的作用一致。脱鞘过程中，排泄细胞的大小及其所含排泄颗粒的数量显著减少。未观察到与脱鞘相关的食管变化。这些以及早期研究者的观察结果表明，脱鞘过程中脱鞘液的来源是排泄细胞而非食管。
