Les cellules � calcium du conjonctif de Ferrissia wautieri (Moll. Ancylidae)

Richardot, M.; Wautier, Jacques

doi:10.1007/bf00307155

Cited by 11 publications

(1 citation statement)

References 15 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Histological and ultrastructural studies have shown that carbonate granules are extracellular formations very similar to those described in some pore cells (Richardot and Wautier, 1972). These mineral concretions are engulfed in chamber-like invaginations of the plasma membrane, which exhibits the characteristic fenestrations (see section on pore cells) through which carbonate granules are kept in contact with the external medium (Chetail and Krampitz, 1982).…”

Section: Cells Binding Metals By Oxygen Donorsmentioning

confidence: 95%

Cellular and subcellular distribution of metals in molluscs

Marigómez

Soto

Cajaraville

et al. 2002

Microscopy Res & Technique

423

202

View full text Add to dashboard Cite

The cellular processes involved in metal metabolism in molluscs are reviewed, with emphasis on the contribution of microscopy (AMG, ARG, EPMA, and SIMS) to both basic research of metal cell biology and applied environmental research. In molluscs, metal uptake may occur by facilitated diffusion, active transport, or endocytosis, and can be enhanced by MT synthesis or formation of mineralized granules. In aquatic molluscs, gills constitute a key interface for dissolved metal uptake, where metals are bound to MT, incorporated into lysosomes, and released basally towards the blood plasma and circulating hemocytes. However, particulate metal uptake is mainly achieved via the digestive tract by endocytosis; further metals are transferred first to lysosomes and then to residual bodies, especially in the digestive cells of the digestive gland. Additionally, metals can be accumulated selectively in specific cell types. As ligands pools differ from cell to cell, different metals may be retained in different cell types. Class "a" metals are localized in cells with granules composed of carbonate, oxalate, phosphate, and sulfate (oxygen donors), whereas "b" metals are associated with those cell types rich in sulfur and nitrogen ligands (sulfur donors). In molluscs, oxygen donors occur in connective tissue calcium cells and basophilic cells, whereas sulfur donors are present in digestive cells, podocytes, nephrocytes, and rhogocytes. Hemocytes, which constitute the most relevant system for metal transport between tissues, move around the body and may penetrate tissues and remove metals from the inner medium to be accumulated in lysosomes as nondigested products. Rhogocytes also participate in metal mobilization, accumulation, and release. The assessment of metal levels in target cells of sentinel molluscs by microscopic techniques provides an early-warning measure, with promising applications as an exposure biomarker for environmental monitoring programs.

show abstract

Section: Cells Binding Metals By Oxygen Donorsmentioning

confidence: 95%

Cellular and subcellular distribution of metals in molluscs

Marigómez

Soto

Cajaraville

et al. 2002

Microscopy Res & Technique

423

202

View full text Add to dashboard Cite

show abstract

Histochemical and ultrastructural features of the aorta of the slug (Limax maximus)

Curtis

Cowden

1979

Journal of Morphology

View full text Add to dashboard Cite

As a part of a continuing study of unusual molluscan tissues, the "chondroid" tissue (Hyman, '67) associated with the anterior and posterior aortae of the slug (Limax maximus) was examined by light and electron microscopy. Unlike the odontophoral tissue of this species (Curtis and Cowden, '771, the "chondroid" tissue comprising the adventitial layer of the aorta consists of large, glycogen-filled cells with characteristic arrays of pores in their plasma membranes resembling those of the "globular"

show abstract