Desportes-Livage I, Nicolas G
Biologie Comparée des Protistes, UA CNRS 138, Complexe Scientifique des Cézeaux, Université de Clermont II, Aubière, France.
J Protozool. 1990 May-Jun;37(3):243-9. doi: 10.1111/j.1550-7408.1990.tb01135.x.
Freeze fracturing of Myxosporidian spores reveals the occurrence of a continuous layer of transmembrane particles all over the surface area of the valve cells which form the spore envelope. These particles are densely packed all over the P face membrane. Due to their polygonal outline, their diameter (6-7 nm) and their central core, they resemble the particles forming the connections of gap junctions which metabolically couple the neighboring cells in animal tissues. In the present report, the role of the transmembrane particles is still hypothetical. However, they might represent a membrane structural specialization of the spores which are submitted to osmotic variations of the fluid external medium. Furthermore similar transmembrane particles are observed at the level of the septate junction which seals the valve cells. In this occurrence, they are arranged in a series of 40 double rows parallel to the suture of the spore envelope. These findings support the view that Myxosporidia are Metazoa and raise the problem of their origin.
黏液孢子虫孢子的冷冻断裂显示，在构成孢子包膜的瓣细胞表面区域存在一层连续的跨膜颗粒。这些颗粒在整个P面膜上密集排列。由于其多边形轮廓、直径（6 - 7纳米）和中心核心，它们类似于形成动物组织中相邻细胞代谢偶联的间隙连接的颗粒。在本报告中，跨膜颗粒的作用仍然是假设性的。然而，它们可能代表了孢子的一种膜结构特化，这种特化会受到外部流体介质渗透压变化的影响。此外，在密封瓣细胞的分隔连接水平也观察到了类似的跨膜颗粒。在这种情况下，它们以一系列40排双行的形式平行于孢子包膜的缝线排列。这些发现支持了黏液孢子虫是后生动物的观点，并提出了它们的起源问题。
