Ultrastructural and histochemical observations of the external epithelium of echinoderm tube feet

Santos, Helena de Souza; Sasso, Wilson da Silva

doi:10.1159/000144220

Cited by 10 publications

(2 citation statements)

References 3 publications

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“…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. Our micrographs also showed large ER cisterns, which were intensely immunolabelled with gold by use of the anti-RS serum.…”

Section: Bipolar Cells In the Ectoneural System And Their Relationshimentioning

confidence: 56%

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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Section: Bipolar Cells In the Ectoneural System And Their Relationshimentioning

confidence: 56%

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

1998

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“…The epidermis is the outer layer of the skin, a stratified squamous epithelium that forms a protective barrier against environmental insults and prevents body dehydration (Kern et al., ). In the echinoderms, sea stars rely on epidermal secretions to cope with their benthic life (Hennebert, Leroy, Wattiez & Lanurner, ; De Souza Santos & Da Silva Sasso, ). In sea cucumber, the secretions (mucous secretions and simply mucus) have been also described in the body wall epidermis (Holland, ).…”

Section: Discussionmentioning

confidence: 99%

Growth, histology, ultrastructure and expression of MITF and astacin in the pigmentation stages of green, white and purple morphs of the sea cucumber,Apostichopus japonicus

et al. 2017

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The body colour of sea cucumber, Apostichopus japonicus (Selenka), is an important trait affecting the price and taste of its products; the rare white and purple colour types are favoured and are more expensive in China. Identification of factors that may contribute to the differences among white, green and purple sea cucumbers will provide a scientific basis for improving the cultivability of the rare colour morphs. In this study, the growth, histology, ultrastructure and expression of microphthalmia-associated transcription factor (MITF) and astacin of two newly discovered white and purple colour morphs were investigated and compared with the common green morph, in the same breeding environment. At 50 days old, the growth and survival rates and the extent of pigmentation were the highest in purple, then green colour morphs and were lowest in white morphs. The white morph had fewer, and less developed, epidermal melanocytes compared with the green and purple colour morphs. MITF and astacin expression, which are necessary for the formation of melanin and astaxanthin, respectively, were highest in purple morphs and lowest in white morphs. In addition, there were significant differences in growth rates and expression of MITF and astacin among early, mid and late pigmentation stages of each colour morph. The results suggested that growth and survival rates were highest in purple sea cucumber and lowest in white sea cucumber. Epidermis thickness and melanin content may be the newfound factors contributed to the differences in growth and survival rate among three colour morphs.

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The Echinoderm Tube Foot and its Role in Temporary Underwater Adhesion

Santos

Hennebert

Coelho

et al. 2009

Functional Surfaces in Biology

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Ultrastructural and histochemical observations of the external epithelium of echinoderm tube feet

Cited by 10 publications

References 3 publications

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

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

Growth, histology, ultrastructure and expression of MITF and astacin in the pigmentation stages of green, white and purple morphs of the sea cucumber,Apostichopus japonicus

The Echinoderm Tube Foot and its Role in Temporary Underwater Adhesion

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