An ultrastructural study of connective tissue in mollusc integument: I. Bivalvia

Bairati, A; Comazzi, M.; Gioria, M

doi:10.1054/tice.2000.0131

Cited by 5 publications

(12 citation statements)

References 33 publications

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“…These junctions are vital elements of the dermo-epidermal junction whose detailed nature varies between the three molluscan classes studies (Bairati et al, 2000(Bairati et al, , 2001(Bairati et al, , 2003 and overall differs clearly from the dermoepidermal junction of mammals.…”

Section: Discussionmentioning

confidence: 99%

“…It is accepted (Green and Jones, 1996) that hemidesmosomes and focal contacts at the basal surface anchor the epithelium securely to the basement membrane and through this to the subepidermal connective tissue. These junctions are vital elements of the dermo-epidermal junction whose detailed nature varies between the three molluscan classes studies (Bairati et al, 2000(Bairati et al, , 2001(Bairati et al, , 2003 and overall differs clearly from the dermoepidermal junction of mammals.…”

Section: Discussionmentioning

confidence: 99%

“…Because intermediate filaments terminate in the plasma membrane along large portions of the basal surface, they contribute to the formation of a much more continuous (and therefore probably stronger) union between cell and basement membrane than do hemidesmosomes, which are typically present at irregular intervals along the basal surface. This more continuous mode of connecting epithelial cells to the basement membrane may be related to the more complex integumental structure found in cephalopods compared to bivalves (Bairati et al, 2000) and gastropods (Bairati et al, 2001), probably related to the fact that most cephalopods are not protected by a shell. It is therefore likely that the situation found in cephalopods is more rather than less specialized, consonant with the fact that cephalopods are the most highly evolved class of mollusc.…”

Section: The Cytoskeletonmentioning

confidence: 99%

“…The ultrastructure of the epithelial cells is variable in different species of mollusc (Bairati et al, 2000(Bairati et al, , 2001(Bairati et al, , 2003. We carried out a comparative study of the morphology of these cells and, particularly, of their junctional apparatus in the epidermis of species from the three main molluscan classes.…”

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An ultrastructural study of cell junctions and the cytoskeleton in epithelial cells of the molluscan integument

Bairati

Gioria

2007

Journal of Morphology

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Cell junctions and the cytoskeleton of integumental epidermal cells from six bivalves, four gastropods, and two cephalopods were studied by transmission electron microscopy. In all species examined, the junctions in supporting cells presented the following similar pattern: an apical-lateral adhesion belt (occluding junctions were not observed); (b) a lateral complex of septate junctions and smooth septate junctions, with interdigitations between adjacent cells while the gap junctions were not constantly present, and a basal complex with hemidesmosomes, focal contacts, and sometimes basolateral adherent junctions. Desmosomes were never observed. Microfilamentous and microgranular material were present throughout the cells, as bundles of microfilaments within microvilli and the terminal web, within interdigitations, and as cytoplasmic plaques forming part of the adherent junctions, hemidesmosomes, and focal contacts. Bundles of intermediate filaments that originated from basal hemidesmosomes were located close to and oriented parallel with the lateral plasma membrane and terminated within the terminal web. In cells of Aplysia depilans, intermediate filaments converged apically to terminate in hemidesmosome-like structures at the bases of the microvilli. In the cephalopods, hemidesmosomes were never observed and intermediate filaments made direct contact with the basal cell membrane. Some functional interpretations and hypotheses were also discussed.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: The Cytoskeletonmentioning

confidence: 99%

mentioning

confidence: 99%

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An ultrastructural study of cell junctions and the cytoskeleton in epithelial cells of the molluscan integument

Bairati

Gioria

2007

Journal of Morphology

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“…For this purpose, then, it is preferable to use ECM components isolated from invertebrates in general and molluscs in particular. The investigation of ECM synthesis in tissue and primary cells cultures is also a future research priority [39][40][41][42].…”

Section: In Vitro Studiesmentioning

confidence: 99%

Extracellular Matrix Components in Bivalvia: Shell and ECM Components in Developmental and Adult Tissues

Dyachuk¹

2018

Fish Aquac J

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The Extracellular matrix (ECM) is a vital trigger of molecular events in development, homeostasis, cell phenotypes, and evolution. Annotated genome databases and their comparative analyses enable the assessment of the most conservative representation of the ECM components among the Metazoa. Bivalves are widely distributed animals present in various ecological niches. They have shells, indirect developmental life cycles, and highly diverse adaptations and habitat reflected by their ECM repertoire. Only recently, researchers began to characterize the conservation among invertebrates and unique species-specific ECM components involved in biomineralization, development, and cell-cell communications. Here, I discuss the most recent data for the dynamic expression of ECM proteins based on transcriptome data during larval oyster development and in adult organs. Using developmental and cell biology approaches along with confocal microscopy, I showed the expression of certain ECM components in the larvae, adult tissues, and cell cultures. A similar methodology is required to understand the molecular mechanisms and dynamic ECM expression in organisms with very complex life cycles, metamorphosis, indirect development via adaptive larvae, and biomineralization during development.

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An ultrastructural study of connective tissue in mollusc integument III

Bairati¹,

Comazzi²,

Gioria³

2003

Tissue and Cell

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We studied structure and ultrastructure of the subepidermal connective tissue (SEC) of the integument of three cephalopods (Sepia officinalis, Octopus vulgaris and Loligo pealii). In all species, three distinct regions of the SEC were recognised: (a) an outer zone (OZ) that included the dermal-epidermal junction, and consisted of a thin layer of connective tissue containing muscles, (b) an extensive middle zone (MZ) containing a compact network of collagen fibres and numerous cells, (c) an inner zone (IZ) of loose connective tissue that merged with muscular fascia. This arrangement differs from that in bivalves and gastropods and recalls vertebrate integument. The dermal-epidermal junction of cephalopods differed from that of bivalves, gastropods and mammals in that the epidermal cells did not possess hemidesmosomes, and their intermediate filaments terminated directly in the plasmamembrane. The thick (120-500 nm) basal membrane (BM) had a superficial zone containing a regular array of granules; a lamina densa composed of a compact network of small filaments and granules; and an IZ distinguished by expansions of granular material protruding into underlying structures. Collagen fibres contained fibroblast-derived cytoplasmic thread, running through their centres and were surrounded by granular material that joins them to adjacent fibres. The collagen fibrils were of medium diameter (30-80 nm) had the typical ultrastructure of fibrillar collagens, and were surrounded by abundant interfibrillar material. The hypodermis was loose, with a network of small bundles of collagen fibrils. Cephalopod integument appears to represent a major evolutionary step distinguishing this class of molluscs.

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An ultrastructural study of connective tissue in mollusc integument: I. Bivalvia

Cited by 5 publications

References 33 publications

An ultrastructural study of cell junctions and the cytoskeleton in epithelial cells of the molluscan integument

An ultrastructural study of cell junctions and the cytoskeleton in epithelial cells of the molluscan integument

Extracellular Matrix Components in Bivalvia: Shell and ECM Components in Developmental and Adult Tissues

An ultrastructural study of connective tissue in mollusc integument III

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