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Journal of Cell Science, Vol 106, Issue 1 355-364, Copyright © 1993 by Company of Biologists

JOURNAL ARTICLES

Dynamic control of cell-cell adhesion and membrane-associated actin during food-induced mouth opening in Beroe

SL Tamm and S Tamm
Boston University Marine Program, Marine Biological Laboratory, Woods Hole, MA 02543.

We used rhodamine-phalloidin and ultrastructural methods to follow dynamic changes in adhesive cell junctions and associated actin filaments during reversible epithelial adhesion in the mouth of the ctenophore Beroe. A cruising Beroe keeps its mouth closed by interdigitated actin-coated appositions between paired strips of cells lining the lips. The mouth opens rapidly (in 0.2-0.3 s) by muscular action to engulf prey (other ctenophores), then re-seals after ingestion. We found that the interlocking surface architecture of the adhesive cells, including the actin-coated junctions, rapidly disappears after food-induced opening of the mouth. In contrast, forcible separation of the lips in the absence of food rips the junctions, still intact, from the surfaces of the cells. The prey-stimulated loss of adhesive cell junctions and associated actin cytoskeleton is one of the most rapid changes in actin-based junctions yet observed. This system provides unique experimental advantages for investigating the dynamic control of reversible cell adhesions and membrane-associated actin filaments.
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© The Company of Biologists Ltd 1993