�ber den Feinbau des Nervensystems des Seesterns (Asterias rubens L.)

Bargmann, W.; Behrens, Behrend

doi:10.1007/bf00319070

Cited by 33 publications

(7 citation statements)

References 14 publications

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“…One suggestion has been the participation of the symmetric intermediate junctions and the phenomenon of transcellular activation, wherein sarcolemmal stretch (physical deformation) is the mechanism for recruiting retractor cells that are not innervated directly. The idea of a mechanical spread of excitation was, in fact, proposed by Bargmann and Behrens (1963) in their early ultrastructural study of sea-star ampullae.…”

Section: Discussionmentioning

confidence: 98%

Organization of the coelomic lining and a juxtaposed nerve plexus in the suckered tube feet of Parastichopus californicus (Echinodermata: Holothuroida)

Cavey

2005

Journal of Morphology

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The coelomic lining of the water-vascular canal in a suckered tube foot from the sea cucumber, Parastichopus californicus, is a pseudostratified myoepithelium consisting of flagellated adluminal cells and myofilament-bearing retractor cells. The bodies of adluminal cells flank the water-vascular canal and send basal processes between the underlying retractor cells to confront the podial connective tissue. Retractor cells have a contractile apparatus of unregistered thick and thin myofilaments. The contractile apparatus is confined to the medullary sarcoplasm and oriented parallel to the primary axis of a tube foot. The bodies and processes of retractor cells intermingle with the basal processes of adluminal cells at the basal lamina of the coelomic lining. A ganglionated nerve plexus in the podial connective tissue approximates the basal lamina. Neuronal connectives link the ganglia to one another and to the nerve plexus in deep sectors of the podial epidermis. External laminae enveloping the ganglia and connectives in the podial connective tissue are continuous with the basal lamina of the epidermis. The adventitial nerve plexus, since it merges with the epidermal nerve plexus, is a component of the ectoneural division of the echinoderm nervous system.

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Section: Discussionmentioning

confidence: 98%

Organization of the coelomic lining and a juxtaposed nerve plexus in the suckered tube feet of Parastichopus californicus (Echinodermata: Holothuroida)

Cavey

2005

Journal of Morphology

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“…The echinoderms studied by Viehweg et al are deuterostomians, as also holds true for the chordates. Interestingly, radial glia in the same species had been depicted at the ultrastructural level (Bargmann et al 1962). Immunoreactivity to the specific antiserum used has also been reported to occur in the nervous system of an insect embryo (Lichtenfeld et al 1998).…”

Section: Introductionmentioning

confidence: 92%

Identification of Reissner's fiber-like glycoproteins in two species of freshwater planarians (Tricladida), by use of specific polyclonal and monoclonal antibodies

Arrabal

Estivill‐Torrús

Miranda

et al. 2000

Cell and Tissue Research

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By using one polyclonal antiserum raised against bovine Reissner's fiber and seven monoclonal antibodies raised against bovine Reissner's fiber and against immunopurified bovine subcommissural organ glycoproteins, we have investigated two freshwater planarian species (Girardia tigrina, Schmidtea mediterranea) by light- and electron-microscopic immunocytochemistry. ELISA probes showed that the monoclonal antibodies recognized different, nonoverlapping, unrepeated, proteinaceous epitopes present in the same compounds of bovine Reissner's fiber. Cells immunoreactive to the polyclonal and monoclonal antibodies were found in the dorsal and ventral integument of both planarian species. Labeled cuboid epidermal cells bore cilia and displayed several types of secretory granules; they were covered by a film of immunoreactive material. Studies on adjacent thin and semithin sections revealed coexistence of label in the same regions and in the same cells when two different monoclonal antibodies were used. These results indicate that a secretory substance immunologically similar to the secretion of the vertebrate subcommissural organ is present in primitive tripoblasts such as planarians, suggesting that these secretions are ancient and well conserved in phylogeny.

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“…This indicates that the antiserum specifically recognises protein epitopes. Bargmann et al (1962) proposed that the bipolar cells in the sea star ectoneural part contribute secretory products used for the formation of the hyaline layer. Electron micrographs of the bipolar cells show different vesicles of up to 2 p m diameter in the cytoplasm as well as primary and secondary lysosomes (Souza Santos & Silva Sasso 1970, 1974.…”

Section: Bipolar Cells In the Ectoneural System And Their Relationshimentioning

confidence: 99%

“…1). Bargmann et al (1962) described supporting cells in the ectoneural system of the sea star Asterias rubens, which they compared with vertebrate glia cells. One reason for this was the dominating bundles of intermediate filament, which with routine histological techniques reacted as conventional glial intermediate filaments.…”

Section: Introductionmentioning

confidence: 99%

Secretory Radial Glia in the Ectoneural System of the Sea Star Asterias rubens (Echinodermata)

1998

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Viehweg, J.. Naumann. W. W. & Olsson. R. 1998. Secretory radial glia in the ectoneural system of the sea star Asterias rubens (Echinodermata).-Acta Zoologica (Stockholm) 79: 1 19-13],Previous studies of epithelial nervous systems have focused on the neuronal elements, but generally neglected the origin of neuro-glial interactions. In this study, we use a polyclonal antiserum directed against Reissner's substance to label non-neuronal bipolar cells in the ectoneural part of the radial nerve cord in the sea star Asterias rubens. Ultrastructural results show secretory activity in these bipolar cells. lmmunolabelled material is released into the extracellular matrix in the hyaline layer as well as in the region of the basal end-feet. As a first step towards characterising the antigen, a specific protein band of 36 kD was demonstrated with immunoprecipitation. Cells of this type: ( I ) traverse the epithelium to full extent from the outer surface to the basal lamina; (2) carry a single apical cilium; (3) contain conspicuous bundles of intermediate filament; (4) produce a secretion which is, at least in part, homologous to the Reissner's substance which is produced by a primitive radial glia cell type in chordates. It is concluded that the bipolar cells in the ectoneural part of the surface epithelium of the sea star Asterias rubens are secretory radial glia, which evidently have a common origin to the radial glia which secretes Reissner's substance in chordates.

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�ber den Feinbau des Nervensystems des Seesterns (Asterias rubens L.)

Cited by 33 publications

References 14 publications

Organization of the coelomic lining and a juxtaposed nerve plexus in the suckered tube feet of Parastichopus californicus (Echinodermata: Holothuroida)

Organization of the coelomic lining and a juxtaposed nerve plexus in the suckered tube feet of Parastichopus californicus (Echinodermata: Holothuroida)

Identification of Reissner's fiber-like glycoproteins in two species of freshwater planarians (Tricladida), by use of specific polyclonal and monoclonal antibodies

Secretory Radial Glia in the Ectoneural System of the Sea Star Asterias rubens (Echinodermata)

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