Paulin J J, Brooks A S
J Cell Sci. 1975 Dec;19(3):531-41. doi: 10.1242/jcs.19.3.531.
The moniliform macronucleus of Stentor coeruleus coalesces and renodulates during division, reorganization and regeneration. These nuclear events are spatially and temporally synchronized with oral primordium development occurring at stages six and seven of membranellar morphogenesis. Coalesced, elongating and early renodulating macronuclei at states six and seven contained microtubules within double membrane-bound channels, passing through the nucleus parallel to the long axis. The number of microtubules per channel varied between 4 and 23. Microtubules were also found in the perinuclear cytoplasm at these stages, forming a loose network around the nucleus. The microtubules and channels are absent in control cells and macronuclei of regenerating cells prior to stage six. These transient microtubules and channels appearing in late stage six and stage seven may provide the axial plane on which elongation of the macronucleus proceeds.
天蓝喇叭虫的念珠状大核在分裂、重组和再生过程中会合并并重新形成结节。这些核事件在时间和空间上与膜状形态发生的第六和第七阶段发生的口原基发育同步。处于第六和第七状态的合并、伸长和早期重新形成结节的大核在双膜结合通道内含有微管，这些微管平行于长轴穿过细胞核。每个通道的微管数量在4到23之间变化。在这些阶段的核周细胞质中也发现了微管，在细胞核周围形成了一个松散的网络。在第六阶段之前的对照细胞和再生细胞的大核中不存在微管和通道。在第六阶段后期和第七阶段出现的这些短暂微管和通道可能提供了大核伸长所依赖的轴向平面。
