Reversible Resorption of Cilia and the Centriole Cycle in Dividing Cells of Sea Urchin Blastulae(Developmental Biology)

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概要

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• The process of ciliogenesis and ciliary resorption during the mitotic cycle of ciliated larval cells of the sea urchin, Temnopleurus toreumaticus, was sequentially followed with a Nomarski optics in living blastulae immobilized by gentle mechanical compression. Each ciliated cell rapidly resorbed its cilium 2 min before the nuclear membrane breakdown, and daughter cells initiated the ciliogenesis 3 min after the completion of cell division. The ciliary resorption was achieved within a few sec by a rapid retraction of the whole axoneme into the cytoplasm. Transmission EM observations of the cells, fixed with an improved preservation technique for microtubules and sectioned in serial, confirmed the morphological changes of cilia and demonstrated the centriole cycle of the cells. In early interphase, the single diplosome of the ciliated cells, consisting of a basal body and a proximal centriole, was replicated to form two diplosomes. Then the proximal centriole and its newly formed daughter centriole started to migrate to the nuclear periphery during interphase leaving the basal body pair which stayed at the ciliary base until prophase. After the ciliary resorption, the basal body together with its daughter was converted into the mitotic diplosome and was positioned at one of the spindle poles. Another pole was occupied by the proximal centriolar pair. At the end of mitosis, each daughter cell received a diplosome, and the mother centriole of it was transformed into the basal body while the daughter turned into the proximal centriole. Therefore, in the ciliated cells of sea urchin larvae, we concluded that a newly formed centriole could first act as a basal body two cell cycles after its origination.

• 社団法人日本動物学会の論文

著者

• 佐藤 英美

  Hokkaido Univ. Sapporo

• Sato Hidemi

  Sugashima Marine Biological Laboratory Nagoya University

• Masuda Michitaka

  Sugashima Marine Biological Laboratory Nagoya University:(present Address)mitsubishi-kasei Institute

関連論文

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• Examinations of spindle structure modified by T-1,the mitotic arrester
• T-1 Dependent Barrel-Shaped Spindle Induction in the Sea Urchin Eggs and the Role of T-1 in Microtubule Assembly
• Effect of Fibronectin on Cultured Cells Derived from Isolated Micromeres of the Sea Urchin, Hemicentrotus pulcherrimus(Developmental Biology)
• Reversible Resorption of Cilia and the Centriole Cycle in Dividing Cells of Sea Urchin Blastulae(Developmental Biology)
• 故Daniel Mazia教授(1912-1996)を悼む
• 染色体と複屈折
• The thermodynamics of molecular association in the mitotic spindle with or without heavy water(D2O) (Advances in Cell Division Research)

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