アメーバ (Amoeba proteus) 細胞質の寄生性封入体の研究 (I)

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  • アメーバ(Amoeba proteus)細胞質の寄生性封入体の研究(1)
  • アメーバ Amoeba proteus サイボウシツ ノ キセイセイ フウニュウタイ ノ ケンキュウ 1
  • A Study of Parasitic Cytoplasmic Inclusion Bodies in Amoeba proteus (I)

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type:P(論文)

細胞内に見られた寄生体を生体標本, 染色標本および樹脂切片標本として光学顕微鏡と電子顕微鏡で観察し, その形態と生活環を調べた. その結果 (1) アメーバ状細胞の時期, (2) 多分裂により生じた多数の小型アメーバ状細胞の時期, (3) 小型アメーバ状細胞が球状化を始め, 胞子壁が形成される時期, (4) 胞子形成が完了した時期が区別された. 胞子には1個の核, 複数のミトコンドリアと空胞および胞子壁が観察された. シスト1個あたりの胞子数は4～30個程度であった. イガイに寄生する微胞子虫類の Steinhausia mytilovum と生活環について形態的に比較したところ, シスト数と胞子壁の数箇所から突出してできた管状構造や, ミトコンドリアの有無に違いが見られた.

A parasite of the cytoplasm of Amoeba proteus (stock IWT03) was observed as live specimens, stained specimens and ultra-thin sectioned preparations, using light and transmission electron microscopes, and its morphogy and life cycle were examined. The results showed that four stages in the life cycle of the parasite could be distinguished as follows : 1) Ameboid cell (4μm in length) not surrounded by a boundary membrane such as a food vacuole membrane ; 2) Many small ameboid cells (1μm in length) formed by fission within the boundary membrane, with spore wall formation yet to begin ; 3) Small ameboid cells take a spherical shape within the boundary membrane ; 4) Mature spores are formed in the cyst. One nucleus, several mitochondria and vacuoles, and spore wall are present in a spore. The number of spores in a cyst varied from four to approximately thirty. As compared with the life cycle of the microsporidian parasite Steinhausia mytilovum of Mytilus galloprovincialis, a large number of parasite cysts were present in the cytoplasm of Amoeba proteus, the tube structures protruding from several parts of the spore wall and a few mitochondria could be observed.

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