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Calcium cytochemistry of nematocyst development in catch tentacles of the sea anemone Haliplanella luciae (Cnidaria: Anthozoa) and the molecular basis for tube inversion into the capsule

Journal of Ultrastructure Research, ISSN: 0022-5320, Vol: 86, Issue: 2, Page: 202-214
1984
  • 13
    Citations
  • 0
    Usage
  • 3
    Captures
  • 1
    Mentions
  • 0
    Social Media
Metric Options:   Counts1 Year3 Year

Metrics Details

  • Citations
    13
    • Citation Indexes
      13
  • Captures
    3
  • Mentions
    1
    • References
      1
      • 1

Article Description

A Golgi-deposition of calcium into developing holotrich nematocysts in catch tentacles of the sea anemone, Haliplanella luciae, was observed at all stages of nematocyst formation, as evidenced by dense antimonate staining in trans -Golgi cisternae and in the nematocyst interior. Such staining is removed by EGTA treatment. Electron-lucent, laminar granules are visible in the nematocyst capsule and external tube of antimonate-stained preparations (by negative staining), but are invisible in both EGTA-treated nematocysts and conventional TEM nematocyst preparations. These granules appear to solubilize prior to tube inversion into the capsule. Electron-lucent fibrils, 50 by 9 nm, along the outer wall of the inverting tube are in contact with similar fibrils along the inner wall of the external tube and might provide the motive force for tube inversion. Inversion is accompanied by an apparent increase in the nematocyst antimonate concentration, and by an increase in the fluid in the cell, suggesting that a dehydration of the nematocyst contents might occur at the time of tube inversion into the capsule.

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