Septate and gap junctions between the epithelial cells of an invertebrate, the mollusc Cominella maculosa

Flower, N.E.

doi:10.1016/s0022-5320(71)80123-5

Cited by 75 publications

(15 citation statements)

References 24 publications

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“…Gap junction ultrastructure is well revealed by freeze fracture and freeze etching. Gilula and Satir (1971) and Flower (1971) used these techniques to reveal gap junctions with septate junctions in cells from two bivalves, in accord with the present observations. They have also been documented using the freeze fracture technique in the gastropods Cominella maculosa (Flower, 1971) and Cepaea nemorali (Giusti, 1976).…”

Section: Cell Junctionssupporting

confidence: 81%

“…In gastropods, the rather complex organization of the integument was described by Luchtel et al (1997), although details of cell junctions were not included. Gap junctions and septate junctions, however, were observed in the glandular epithelium of the ''prosobranch'' Cominella maculosa (Flower, 1971). Albrecht and Cavicchia (2001) described the presence of adherent and septate junctions in the mantle epithelium covering the testicle of the freshwater gastropod Pomacea canaliculata.…”

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confidence: 99%

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An ultrastructural study of cell junctions and the cytoskeleton in epithelial cells of the molluscan integument

Bairati

Gioria

2007

Journal of Morphology

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Cell junctions and the cytoskeleton of integumental epidermal cells from six bivalves, four gastropods, and two cephalopods were studied by transmission electron microscopy. In all species examined, the junctions in supporting cells presented the following similar pattern: an apical-lateral adhesion belt (occluding junctions were not observed); (b) a lateral complex of septate junctions and smooth septate junctions, with interdigitations between adjacent cells while the gap junctions were not constantly present, and a basal complex with hemidesmosomes, focal contacts, and sometimes basolateral adherent junctions. Desmosomes were never observed. Microfilamentous and microgranular material were present throughout the cells, as bundles of microfilaments within microvilli and the terminal web, within interdigitations, and as cytoplasmic plaques forming part of the adherent junctions, hemidesmosomes, and focal contacts. Bundles of intermediate filaments that originated from basal hemidesmosomes were located close to and oriented parallel with the lateral plasma membrane and terminated within the terminal web. In cells of Aplysia depilans, intermediate filaments converged apically to terminate in hemidesmosome-like structures at the bases of the microvilli. In the cephalopods, hemidesmosomes were never observed and intermediate filaments made direct contact with the basal cell membrane. Some functional interpretations and hypotheses were also discussed.

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Section: Cell Junctionssupporting

confidence: 81%

mentioning

confidence: 99%

An ultrastructural study of cell junctions and the cytoskeleton in epithelial cells of the molluscan integument

Bairati

Gioria

2007

Journal of Morphology

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“…The structure of the gap junctions described here is typical of that found in several other molluscan tissues (Flower, 1971;Gilula & Satir, 1971). A wide variety of structures have sometimes been called septate junctions, often without justification (cf.…”

Section: Discussionmentioning

confidence: 78%

“…1). Thus these junctions are of the A type (Flower, 1971;Staehelin, 1974). The particles are rather loosely packed.…”

Section: Gap Junctionsmentioning

confidence: 95%

Gap junctions and septate-like junctions between neurons of the opisthobranch molluscNavanax inermis

1983

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The buccal ganglia of Navanax inermis were studied by thin section, lanthanum infiltration and freeze fracture. Freeze fracture clearly demonstrates small gap junctions between neuronal processes in the neuropil, many of which are known to be electrotonically coupled. Junctional particles cleave with the P-face. In thin section, gap junctions appeared as small blurred contacts, presumably because of the small size of the junctions. Lanthanum infiltration was poor and failed to aid in identifying gap junctions. However, it did reveal septate-like junctions whose septa were not osmiophilic. Corresponding E-face grooves and ridges were seen in freeze fracture, sometimes adjacent to gap junctions. The septate-like junctions have parallel membranes and may have been mistaken for gap junctions in several other thin section studies of invertebrate neurons.

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“…Interestingly, the electron-opaque reaction product was localized in the septa of the septate junction, raising the possibility that these cell junctions play a role in electrotonic coupling . Since gap and septate junctions can coexist in a variety of arthropod epithelia (17,21,25,26,49), it would have been interesting if the gap junctions between the HRP-stained Chironomus cells had also been studied . Due to the movement of HRP after aldehyde fixation (8), data from these kinds of experiments must be interpreted with caution .…”

Section: Introductionmentioning

confidence: 99%

The Splitting of Hepatocyte Gap Junctions and Zonulae Occludentes With Hypertonic Disaccharides

Goodenough

Gilula

1974

The Journal of Cell Biology

176

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Mouse livers were perfused in situ through the portal vein with the disaccharides sucrose, lactose, maltose, and cellobiose in hypertonic concentrations (0 .5 M) . This treatment resulted in plasmolysis of the hepatocytes and splitting of the gap junctions and zonulae occludentes . The junctions split symmetrically, leaving a half-junction on each of the two separated cells . The process of junction splitting is followed using the freeze-fracture technique, since the junctional membranes are indistinguishable from the nonjunctional membranes in -thin sections once the splitting occurs . The split junctions are also studied using the freeze-etch technique, allowing a view of the gap junction extracellular surface normally sequestered within the 2-nm "gap ." The monosaccharides sorbitol and mannitol did not split the junctions during the times studied (2 min), but substitution of the chloride ion with propionate in the perfusion mixture did result in junction splitting . An envelope of morphologically distinct particles surrounding freeze-fractured gap junctions is also described .

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Septate and gap junctions between the epithelial cells of an invertebrate, the mollusc Cominella maculosa

Cited by 75 publications

References 24 publications

An ultrastructural study of cell junctions and the cytoskeleton in epithelial cells of the molluscan integument

An ultrastructural study of cell junctions and the cytoskeleton in epithelial cells of the molluscan integument

Gap junctions and septate-like junctions between neurons of the opisthobranch molluscNavanax inermis

The Splitting of Hepatocyte Gap Junctions and Zonulae Occludentes With Hypertonic Disaccharides

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