. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. CELL-TO-CELL COUPLING AND CONNEXIN IN AN ANTHOZOAN 363. Figure 7. Electron micrographs showing small zones of close apposition (arrows) between plasma membranes of contiguous endodermal cells. (A) Between two myoepithelial cells also connected by a sep- tate junction (SeJ); one of the cells contains a motor ciliary rootlet (ROO). (B) Between a photocyte and two processes (PRO) of unidentified endodermal cells. Note also contact zone with intercellular gap densities displaying periodicity (arrowhead). (C) Between a digestive
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. CELL-TO-CELL COUPLING AND CONNEXIN IN AN ANTHOZOAN 363. Figure 7. Electron micrographs showing small zones of close apposition (arrows) between plasma membranes of contiguous endodermal cells. (A) Between two myoepithelial cells also connected by a sep- tate junction (SeJ); one of the cells contains a motor ciliary rootlet (ROO). (B) Between a photocyte and two processes (PRO) of unidentified endodermal cells. Note also contact zone with intercellular gap densities displaying periodicity (arrowhead). (C) Between a digestive cell (DIG) and a photocyte (PHO). Calibration bars = ^m (A), nm (B,C). belong to the vertebrate connexin family, and a case has been made for the existence of a distinct family of inver- tebrate gap junction proteins based on sequence homol- ogies of Drosophila and Caenorhabditis gene products suspected of involvement in electrical synapses (Barnes, 1994). More direct evidence was recently adduced for the involvement in intercellular coupling of two such pro- teins derived from Caenorhabditis cDNA sequences and exhibiting a membrane topology strikingly similar to that of connexins (Starich et al., 1996). However, the de- tection in Hydra of a protein recognized by antibodies to rat-liver gap junction proteins (Fraser et al., 1987)and in sea anemones of a mRNA hybridization signal probed with rat heart connexin cDNA (Hessinger et al., 1992) lends support to the notion that the connexin family may extend phylogenetically to the phylum Cnidaria. The Western blot detection in sea pansy tissues of a protein recognized by a monoclonal antibody to a pep- tide segment of rat heart Cx43 provides further evidence that a Cx43-like protein similar to that of mammals ex- ists in anthozoans. The detection was highly specific: no other band appeared on the immunoblot except for the dimeric form of the protein, also seen in simultaneously processed blots from rat heart extracts. The pe
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Keywords: ., bookauthorlilliefrankrat, booksubjectbiology, booksubjectzoology
