Structure of the Digestive Tube in the Holothurian Eupentacta fraudatrix (Holothuroidea: Dendrochirota)

Mashanov, Vladimir; Frolova, Lidia T.; Dolmatov, Igor Yu.

doi:10.1023/b:rumb.0000046550.23343.b4

Cited by 26 publications

(32 citation statements)

References 9 publications

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“…During this stage, both regrowth of all the anatomal structures and differentiation of the main cell types occur. These events indicate that gut regeneration in A. mediterranea is very similar to other regeneration processes involving the gut and other echinoderm organs [1,12,32,33,42,43,46,47]. In all these cases, three phases of repair/regeneration can be distinguished.…”

Section: Discussionmentioning

confidence: 75%

“…Fission of apodid holothurians and surgical transection of juveniles of dendrochirotid holothurians result in a loss of the posterior parts of the body. Regeneration of these digestive systems occurs by a morphallactic reorganization of remaining regions of the intestine [41,42].…”

Section: Discussionmentioning

confidence: 99%

“…This phenomenon is apparently a typical epimorphic process, where a blastema-like structure is formed as a thickening of the edge of the mesentery. In the following stages, the regrowth of the intestinal tract can imply two alternative mechanisms of cell recruitment: a) from the remnants of the oesophagus and cloaca, through morphallactic mechanisms of tissue rearrangement and migration/proliferation of endodermally derived cells [31,33,[39][40][41][42][43][44]; b) from coelomic epithelium, through proliferation/migration and trans-differentiation phenomena of new mesodermally derived progenitor cells. This second mechanism occurs typically when endodermally derived tissues are completely lost by evisceration [45][46][47].…”

Section: Introductionmentioning

confidence: 99%

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Visceral regeneration in the crinoid Antedon mediterranea: basic mechanisms, tissues and cells involved in gut regrowth

et al. 2006

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Abstract:Crinoids are able to regenerate completely many body parts, namely arms, pinnules, cirri, and also viscera, including the whole gut, lost after self-induced or traumatic mutilations. In contrast to the regenerative processes related to external appendages, those related to internal organs have been poorly investigated. In order to provide a comprehensive view of these processes, and of their main events, timing and mechanisms, the present work is exploring visceral regeneration in the feather star Antedon meditteranea. The histological and cellular aspects of visceral regeneration were monitored at predetermined times (from 24 hours to 3 weeks post evisceration) using microscopy and immunocytochemistry. The overall regeneration process can be divided into three main phases, leading in 3 weeks to the reconstruction of a complete functional gut. After a brief wound healing phase, new tissues and organs develop as a result of extensive cell migration and transdifferentiation. The cells involved in these processes are mainly coelothelial cells, which after trans-differentiating into progenitor cells form clusters of enterocytic precursors. The advanced phase is then characterized by the growth and differentiation of the gut rudiment. In general, our results confirm the striking potential for repair (wound healing) and regeneration displayed by crinoids at the organ, tissue and cellular levels.

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Section: Discussionmentioning

confidence: 75%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Visceral regeneration in the crinoid Antedon mediterranea: basic mechanisms, tissues and cells involved in gut regrowth

et al. 2006

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“…On the other hand, our knowledge of the holothurian nervous system is limited primarily to the nerves associated with viscera and body appendages (Bouland et al 1982;McKenzie 1987McKenzie , 1988Jangoux 1987, 1993;Flammang and Jangoux 1992;Smiley 1994;VandenSpiegel et al 1995;Mashanov and Dolmatov 2001;Mashanov et al 2004). There have been no papers that focus specifically on the fine structure of the peripharyngeal nerve ring and RNCs, which constitute the most prominent part of the holothuroidean nervous system.…”

Section: Introductionmentioning

confidence: 98%

Ultrastructure of the circumoral nerve ring and the radial nerve cords in holothurians (Echinodermata)

et al. 2006

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The circumoral nerve ring and the radial nerve cords (RNCs) of Eupentacta fraudatrix and Pseudocnus lubricus (Holothuroidea) were examined as an example of holothurian nervous tissue. The RNC is composed of outer ectoneural and inner hyponeural layers, which are interconnected with one another via short neural bridges. The circumoral nerve ring is purely ectoneural. Both ectoneural and hyponeural components are epithelial tubes with a thick neuroepithelium at one side. A thin ciliated non-neuronal epithelium complements the neuroepithelium to form a tube, thereby enclosing the epineural and hyponeural canals. The whole of the ectoneural and hyponeural subsystems is separated from the surrounding tissue by a continuous basal lamina. The nerve ring and the ectoneural and hyponeural parts of the radial nerves are all neuroepithelia composed of supporting cells and neurons. Supporting cells are interpreted as being glial cells. Based on ultrastructural characters, three types of neurons can be distinguished:(1) putative primary sensory neurons, whose cilium protrudes into the epineural or hyponeural canal; (2) non-ciliated neurons with swollen rough endoplasmic reticulum cisternae; (3) monociliated neurons that are embedded in the trunk of nerve fibers. Different types of synapses occur in the neuropile area. They meet all morphological criteria of classical chemical synapses. Vacuolated cells occur in the neuroepithelium of E. fraudatrix, but are absent in P. lubricus; their function is unknown. The cells of the non-neuronal epithelia that overlie the ectoneural and hyponeural canals are hypothesized to belong to the same cell type as the supporting cells of the neuroepithelium.

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“…El sistema digestivo de los pepinos de mar suscita un interés particular por su función y la capacidad de regeneración del mismo; su morfología es muy variable, según el régimen alimenticio y el tipo de hábitat que ocupan (Feral & Massin, 1982). A pesar de la importancia que representa este órgano, su estructura y función ha sido poco estudiada (Feral & Massin, 1982;Foster & Hodgson 1996;Mashanov & Dolmatov, 2001;Mashanov, Frolova, & Dolmatov, 2004;Kamenev, Dolmatov, Frolova, & Nguyen, 2013). El conocimiento de la morfología es fundamental para entender la nutrición y sus aspectos ecológicos, fisiológi-cos y sus aplicaciones en la acuicultura.…”

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Histology of the digestive tract of three species of sea cucumber Isostichopus badionotus, Stichopus sp. and Stichopus hermanni (Aspidochirotida: Stichopodidae).

Vergara

Rodríguez

2015

RBT

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Histology of the digestive tract of three species of sea cucumber Isostichopus badionotus, Isostichopus sp. and Stichopus hermanni (Aspidochirotida: Stichopodidae). Sea cucumbers have an important ecological role in the marine environment because they are able to process organic and inorganic matter, which contributes to the oxygenation and energy transfer in the ecosystem. In general, there is a lack of knowledge on the basic morphology of native species of sea cucumber and the function of vital organs. The aim of this study was to describe the histology of the digestive tract (DT) of three species of holothuroids from Rodadero Bay, Colombia. Thirty specimens of Isostichopus badionotus, Isostichopus sp. and Stichopus hermanni were obtained and sacrificed by hypothermia. In the laboratory, sections of foregut, midgut and hindgut were obtained and fixed in formalin (10%) for later conventional histological processes; besides, some samples were fixed in glutaraldehyde (3%) for their inclusion in resins and studies in high resolution and electron microscopy. For the studied species, the DT is long, folded, and is distributed in the coelomic cavity; it has at least twice the length of the sea cucumber body. The DT presents villi lined by a columnar pseudostratified ciliated epithelium, which rests on a basement membrane and a layer of collagen fibers. Four types of cells were identified: coelocmocytes, brown cells, enterocytes and mucous cells, and the spicules were evident throughout the digestive tract tissue. Light microscopy showed elongated inclusions of calcareous formation located essentially in the hindgut, "the psamoma bodies". We observed granular mucous cells with an apical surface with numerous microvilli. The histology of the DT of I. badionotus, Isostichopus sp. and S. hermanni were found to be similar, but we found differences (p<0.05) in the thickness of the intestinal submucosa tissue, which can be tied to specific feeding habits of each species. Characterization of the morphohistology of the digestive tract of sea cucumber is a useful tool to understand their feeding physiology. Rev. Biol. Trop. 63 (4): 1021-1033. Epub 2015 December 01.

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Structure of the Digestive Tube in the Holothurian Eupentacta fraudatrix (Holothuroidea: Dendrochirota)

Cited by 26 publications

References 9 publications

Visceral regeneration in the crinoid Antedon mediterranea: basic mechanisms, tissues and cells involved in gut regrowth

Visceral regeneration in the crinoid Antedon mediterranea: basic mechanisms, tissues and cells involved in gut regrowth

Ultrastructure of the circumoral nerve ring and the radial nerve cords in holothurians (Echinodermata)

Histology of the digestive tract of three species of sea cucumber Isostichopus badionotus, Stichopus sp. and Stichopus hermanni (Aspidochirotida: Stichopodidae).

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