Immunocytochemical and ultrastructural evidence for supra- and subesophageal localization of the dorsal-body cells of the snail Helix aspersa

Marchand, Claude-Roland; Dubois, M. P.

doi:10.1016/0016-6480(86)90136-x

Cited by 15 publications

(5 citation statements)

References 17 publications

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“…At the ultrastructural level, the cells of the JO of A. juliana resemble the glandular cells described in the JO of prosobranchs [4,5] and the DB of pulmonates [19][20][21][22][23][24]. All have similar nuclear morphology and abundant mitochondria.…”

Section: Discussionmentioning

confidence: 99%

“…In the latter (Basommatophora), the DB are well-defined organs delimited by a connective tissue capsule and divided into a cortex consisting of cell bodies and a medullla composed primarily of DB cell processes [19,20]. In contrast, the DB in most Stylommatophora are diffuse and consist of groups of glandular cells dispersed throughout the connective tissue sheath of the cerebral ganglia [7,[21][22][23] and, in Limax maximus and Helix aspersa, even in the sheath surrounding the subesophageal ganglia [10,24].…”

Section: Discussionmentioning

confidence: 99%

“…All have similar nuclear morphology and abundant mitochondria. The size of secretory granules and their scarcity, the limited rough endoplasmic reticulum, and ample lipid in the JO of A. juliana are more similar to the DB in pulmonates [19][20][21][22][23][24] than to the JO of the prosobranch Gibbula umbilicalis which has numerous larger (100-200JLm) secretory granules, a well developed rough endoplasmic reticulum, and little lipid. The cells of the JO in G. umbilicalis [5] and A. juliana are ciliated, but this feature has not been reported for the DB of pulmonates and its significance is unclear.…”

Section: Discussionmentioning

confidence: 99%

“…Factors isolated from the DB that stimulate galactogen-synthesis in the albumen gland of L. maximus and activate adenylate cyclase activity in follicle cells of vitellogenic oocytes in Lymnaea stagnalis are both inactivated when treated with proteolytic enzymes and are thus thought to be peptides [9,25]. Also the DB of H. aspersa bind antibodies to the opioid pentapeptide methionine enkephalin [24]. On the other hand, the DB are capable of producing steroids [26], extracts of the DB of Helix pomatia and L. stagnalis contain immunoreactive ecdysteroids, and in vitro the DB of H. pomatia release considerable quantities of ecdysone into the medium [27].…”

Section: Discussionmentioning

confidence: 99%

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Ultrastructure of the Juxtaganglionar Organ, a Putative Endocrine Gland Associated with the Cerebral Ganglia ofAplysia juliana

Switzer-Dunlap

1987

International Journal of Invertebrate Reproduction and Developm

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Electron microscopy was used to examine the morphology of a putative endocrine gland, thejuxtaganglionar organ (JO), and its relation to the cerebral ganglia of the hermaphroditic opisthobranch gastropod Aplysia juliana. The JO is a well-vascularized, poorly innervated tissue of glandular cells-rich in mitochondria, lipids, ribosomes, and endoplasmic reticulum, with sparse cilia and membrane-limited secretory granules -within the connective tissue sheath just exterior to the neuronal soma in the dorsal and posterior portions of the cerebral ganglia. The cytology and organization of the JO supports its homology to the dorsal bodies of pulmonate gastropods, which are endocrine organs known to release one or more female gonadotropic factors.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

See 2 more Smart Citations

Ultrastructure of the Juxtaganglionar Organ, a Putative Endocrine Gland Associated with the Cerebral Ganglia ofAplysia juliana

Switzer-Dunlap

1987

International Journal of Invertebrate Reproduction and Developm

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“…The optic tentacle of pulmonate snails also has a tentacular ganglion that is involved in olfactory orientation (Chase & Croll 1981) and can very successfully regenerate it (Chase & Kamil 1983a,b; Bale et al 2001). Probably, ganglion cells are the source of the new tentacular ganglion, known as collar cells (Rogers 1969; Marchand & Dubois 1986). The latter are distributed widely in the tentacle (Eakin & Ferlatte 1973).…”

Section: Visual System Regeneration In Gastropodsmentioning

confidence: 99%

Regeneration of the visual system in gastropods (Mollusca)

Tuchina

Meyer-Rochow

2010

Invertebrate Biology

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Abstract. The topic of tissue and organ regeneration has been of interest to life scientists ever since the phenomenon was noticed. The reason for this is obvious: if one can learn what drives and controls regeneration, i.e., how lost or damaged structures can be replaced, one not only has a better chance to understand an animal's embryogenesis and evolutionary relationship with other taxa, but one would also be in a better position to treat organ loss or tissue damage in humans. In this context, the possible restitution of individual sensory neurons or nerve projections has been of special interest to us. We identified central visual projections in several gastropod species and found that: (1) projections are very extensive across the brain and (2) they have connections with other systems and organs (including, most likely, non‐ocular skin photoreceptors) that may be involved in the integration of signals from different sensors. Investigations of afferent and efferent visual elements at a morphological level should help reveal the neuronal basis of a gastropod's behavioral reactions.

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Mating‐induced release of granules by the endocrine dorsal body cells of the snail Helisoma duryi (Mollusca)

1989

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The hermaphrodite snail Helisoma duryi reproduces preferentially by cross-fertilization. Virgin and castrated snails lay an insignificant number of egg masses. The fine structure of its endocrine dorsal bodies (DB), which regulate reproduction, has been studied in reproductively inactive virgin and castrated snails and in reproductively active mated snails, using tannic acid staining and autoradiography after injection of L3Hlleucine. The DB cells of the mated snails appear synthetically active, containing scattered rough endoplasmic reticulum (RER) and probably smooth endoplasmic reticulum (SER), many Golgi complexes, and putative DB hormone-containing granules. On the other hand, the DB cells of the virgin and castrated snails appear synthetically inactive, containing RER in circular stacks, few Golgi complexes, many lipid droplets, and scattered glycogen. Mitochondria appear slender in mated snails, whereas those in virgin and castrated snails appear large and spherical. With tannic acid treatment, the processes of the DB cells of mated snails exhibited more released granules than those of virgin and castrated snails. Many silver grains were seen on RER, Golgi complexes, and mitochondria in the autoradiographs of the DB cells of mated snails. It is suggested that the DB cells of the reproductively active snails are synthetically more active than those in virgin and castrated snails and that the DB cells may produce peptide hormone as well as a steroid hormone.

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Immunocytochemical and ultrastructural evidence for supra- and subesophageal localization of the dorsal-body cells of the snail Helix aspersa

Cited by 15 publications

References 17 publications

Ultrastructure of the Juxtaganglionar Organ, a Putative Endocrine Gland Associated with the Cerebral Ganglia ofAplysia juliana

Ultrastructure of the Juxtaganglionar Organ, a Putative Endocrine Gland Associated with the Cerebral Ganglia ofAplysia juliana

Regeneration of the visual system in gastropods (Mollusca)

Mating‐induced release of granules by the endocrine dorsal body cells of the snail Helisoma duryi (Mollusca)

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