Light and electron microscopical investigations on the salivary glands of Lymnaea stagnalis L.

Boer, H. H.; Bonga, S.E. Wendelaar; Rooijen, Nico van

doi:10.1007/bf00343100

Cited by 36 publications

(23 citation statements)

References 7 publications

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“…Dois tipos de células secretoras mucosas, similarmente ao observado para os Limacoidea e Milacidae, foram também diferenciadas por BOER et al (1967), WALKER (1970), BELTZ & GELPERIN (1979), MORENO et al (1982) e CHARRIER (1988.…”

Section: Discussionunclassified

“…Esse tipo celular corresponde às "cellules cystiques" descritas por BLAIN (1957), BANI (1964) e CHARRIER (1988, bem como às células císticas de P. soleiformis (LEAL-ZANCHET et al 1991) e "cells with an acidophilic inclusion" (BOER et al 1967).…”

Section: Discussionunclassified

“…Pelas suas características gerais, as células serosas do tipo I das espécies estudadas no presente trabalho correspondem provavelmente às "grain cells" descritas por BOER et al (1967) e WALKER (1970, assim como às "cell type III" de BELTZ & GELPERIN (1979) e "type P2 cells" de MOYA et al (1992.…”

Section: Discussionunclassified

“…Células basófilas similares às aqui descritas são também diferenciadas por BLAIN (1957), BOER et al (1967 (BOER et al 1967). O termo células basófilas foi também utilizado para designar um tipo de célula secretora em P. soleiformis por LEAL- ZANCHET et al (1991), o qual, porém, não corresponde às células basófilas das espécies estudadas no presente trabalho.…”

Section: Discussionunclassified

“…Nos gastrópodes pulmonados, as glândulas salivares tiveram sua histologia e/ou ultraestrutura descritas para poucas espécies, podendo-se mencionar Arion ater (Linnaeus, 1758) (MOYA et al 1992), Deroceras reticulatum (WALKER 1970), Eobania vermiculata (Müller, 1774) (BANI 1964), Helix aspersa Müller, 1774(BLAIN 1957, MORENO et al 1982, CHARRIER 1988, Limax maximus Linnaeus, 1758(BELTZ & GELPERIN 1979, Lymnaea stagnalis Linnaeus, 1758 (BOER et al 1967) e Phyllocaulis soleiformis (Orbigny, 1835) (LEAL-ZANCHET et al 1991), dentre outros. Uma revisão dos estudos histológicos e ultraestruturais realizados sobre a estrutura das glândulas salivares dos gastrópodes pode ser encontrada em HYMAN (1967), LEAL-ZANCHET et al (1991) e LUCHTEL et al (1997.…”

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Histologia das glândulas salivares dos Limacoidea e Milacidae (Gastropoda, Pulmonata)

Leal-Zanchet

2003

Rev. Bras. Zool.

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Section: Discussionunclassified

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Histologia das glândulas salivares dos Limacoidea e Milacidae (Gastropoda, Pulmonata)

Leal-Zanchet

2003

Rev. Bras. Zool.

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Luminal and basolateral surface membranes of secretory acinar cells: Electrophysiological comparison of cationic sensitivities

et al. 1985

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Cation sensitivities (K+, Na+, and Ca2+) of luminal and basolateral membrane surfaces of secretory acinar cells were compared using a luminally perfused and externally superfused salivary gland from the aquatic snail, Helisoma trivolvis. Tight junctions delimiting the two membrane surfaces were observed near the acinar lumen suggesting that the total membrane area exposed to the superfusion solution exceeded that in contact with the luminal perfusion solution. The resting membrane potential of acinar cells was found to be dependent upon the K+ concentration in both the external superfusion and the luminal perfusion solutions. Unilateral K+ elevation at either membrane surface produced a rapid and sustained depolarization of the acinar cell. For a given K+ concentration, the level of depolarization produced by K+ elevation at the basolateral surface was significantly higher than at the luminal surface. The highest level of membrane depolarization was observed following simultaneous K+ elevation at both membrane surfaces. The ability of acinar cells to generate overshooting action potentials in response to electrical field stimulation was dependent upon both Na+ and Ca2+. Complete blockade invariably occurred following bilateral removal of either cation. The effects of unilateral removal of either Na+ or Ca2+ proved to be somewhat variable. In general, unilateral removal of Na+ was more effective in reducing the regenerative response than Ca2+ while removal of either cation from the basolateral surface was more effective in reducing the regenerative response than its removal from the luminal surface. Electrically evoked action potentials in acinar cells could also be blocked with unilateral application of the Ca2+ antagonist, cadmium (Cd2+), at either membrane surface. However, higher Cd2+ concentrations were required to achieve complete blockade when applied to the luminal than to the basolateral gland surface. This result fails to support a hypothesis of voltage-sensitive Ca2+ channels being spatially restricted to the luminal cell surface in this preparation.

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Histochemical and ultrastructural study of the alimentary tract of the freshwater snail Lymnaea stagnalis

Boer

Kits

1990

Journal of Morphology

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The alimentary tract of the freshwater snail Lymnaea stagnalis, except the salivary glands and the digestive gland, was studied with histochemical and ultrastructural methods. The main focus was on the epithelia. Previous studies have indicated that the digestive gland, where intracellular digestion occurs, plays the major role in the digestion process. The main cell types of the tract are ciliated cells and cells with microvilli. The presence of ciliated cells reflects transport of food particles and faeces. In particular areas, viz. the prooesophagus and the pylorus, the epithelium is almost exclusively composed of ciliated cells. Both cell types show signs of endocytosis, lysosomal breakdown of substances, and storage of reserve materials (glycogen, lipid, protein). These features are very prominent in the crop and in the first part of the prointestine and they would indicate that absorption of energy-rich substances can occur in the whole tract. Ten types of gland cells were distinguished. Their possible functions are discussed on the basis of their histochemical properties and ultrastructure of the secretion products. The observations suggest that some of the cell types produce two different substances, one of which may have enzymatic properties. The epithelium of the gizzard consists of cells possessing stout microvilli, which extend into a special coating produced by these cells. The morphology of the epithelium reflects the function of the gizzard, which is comminution of food particles. In the mid- and postintestine occur areas composed of villi cells that possess an extensive basal labyrinth. The morphology of the cells indicates that they may be involved in absorption of water and ions from the faecal pellets. The whole tract is richly innervated. Numerous neurons occur in the connective tissue and muscle layers. Furthermore, in several areas numerous intraepithelial neurons were observed.

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Light and electron microscopical investigations on the salivary glands of Lymnaea stagnalis L.

Cited by 36 publications

References 7 publications

Histologia das glândulas salivares dos Limacoidea e Milacidae (Gastropoda, Pulmonata)

Histologia das glândulas salivares dos Limacoidea e Milacidae (Gastropoda, Pulmonata)

Luminal and basolateral surface membranes of secretory acinar cells: Electrophysiological comparison of cationic sensitivities

Histochemical and ultrastructural study of the alimentary tract of the freshwater snail Lymnaea stagnalis

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