Fine structure of dicyemid mesozoans, with special reference to cell junctions

Journal of Morphology
Hidetaka FuruyaYutaka Koshida

Abstract

The fine structure of the dicyemid mesozoan, Dicyema acuticephalum, from Octopus vulgaris, was studied with special attention to intercellular junctional complexes between various kinds of cells. Two types of intercellular junction, namely, adherens junctions and gap junctions, were found in both vermiform stages and in infusoriform embryos. Adherens junctions were classified into two types. Zonulae adherentes-like junctions were observed between adjacent peripheral cells at vermiform stages, between adjacent external cells of infusoriform embryos, and between members of groups of internal cells that covered the urn in infusoriform embryos. Maculae adherentes-like junctions were seen between a peripheral cell and an axial cell at vermiform stages. In infusoriform embryos, these junctions were observed between various types of cells, excluding urn cells. Gap junctions were found between adjacent peripheral cells at vermiform stages, whereas in infusoriform embryos these junctions were located between various types of cells excluding urn cells. Dicyemids might be the most primitive multicellular animals to possess these basic types of cell junctions. Ciliary rootlet systems at vermiform stages and in infusoriform embryos were uni...Continue Reading

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Citations

Sep 18, 2004·Journal of Morphology·Hidetaka FuruyaKazuhiko Tsuneki
Jul 14, 2007·The Journal of Parasitology·Kazutoyo OginoHidetaka Furuya
Mar 5, 2008·The Journal of Parasitology·Kazutoyo OginoHidetaka Furuya
Apr 1, 2008·The Journal of Parasitology·Hidetaka Furuya
Jun 26, 2008·The Journal of Parasitology·Hidetaka Furuya
Jan 6, 2010·The Journal of Parasitology·Hidetaka Furuya
Apr 22, 2011·The Journal of Parasitology·Kazutoyo OginoHidetaka Furuya
Oct 23, 2008·The Journal of Parasitology·Hidetaka Furuya
Dec 17, 2010·The Journal of Parasitology·Hidetaka Furuya
Apr 22, 2011·The Journal of Parasitology·Sheila Castellanos-MartinezHidetaka Furuya

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Adherens Junctions

An adherens junction is defined as a cell junction whose cytoplasmic face is linked to the actin cytoskeleton. They can appear as bands encircling the cell (zonula adherens) or as spots of attachment to the extracellular matrix (adhesion plaques). Adherens junctions uniquely disassemble in uterine epithelial cells to allow the blastocyst to penetrate between epithelial cells. Discover the latest research on adherens junctions here.