In Vitro Study on Morphogenesis of Sea Urchin Larval Spicule : Adhesiveness of Cells(Developmental Biology)

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概要

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• The micromeres isolated from sea urchin embryos at the 16-cell stage and cultured in sea water containing serum form spicules of 3 types in shape; 1-, 2- and 3-dimensional. Although these in vitro spicules appear somewhat different from in vivo spicules, 3-dimensional spicule formed in vitro seems to be essentially the same as the latter, judging from developmental course, size and relation between growth direction and crystal axes. On the other hand, 1- or 2-dimensional spicule is interpreted as corresponding to a part of the 3-dimensional spicule. In search of factors which govern morphogenesis of spicule, the isolated micromeres were cultured in vitro under various serum concentrations and different substrata and shape of resultant spicule was inspected using dimension of the spicule as a criterion. As a general tendency, it was found that final shape of the spicule had relation to the condition of micromere descendants at early stage of spicule formation. In other words, the longer the period of time while cell cluster derived from a micromere maintained a state of an aggregate, the more the formation of 3-dimensional spicule and vice versa; the earlier the time when members of the cluster dispersed into a monolayer attached to the substratum, the more the formation of 1-dimensional spicule. These facts suggest that adhesiveness of the micromere descendants is in close connection with morphogenesis of the spicule.

• 社団法人日本動物学会の論文

著者

• KINOSHITA TSUTOMU

  Department of Biology, School of Dental Medicine, Tsurumi University

• Kinoshita T

  Kwansei Gakuin Univ. Hyogo Jpn

• Kinoshita Tsutomu

  Department Of Biology School Of Dental Medicine Tsurumi University

• OKAZAKI KAYO

  Department of Biology, Tokyo Metropolitan University

• Okazaki Kayo

  Department Of Biology Tokyo Metropolitan University

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