Morphological Maturation Level of the Esophagus Is Associated With the Number of Circumesophageal Muscle Fibers During Archenteron Formation in the Starfish <i>Patiria (Asterina) pectinifera</i>

Miguchi, Yuji; Takata, Hiromi; Doihara, Takuya; Miyawaki, Kyojy; Shimokawa, Tetsuya; Hamada, Fumihiko; Kobayashi, Naoto; Matsuda, Seiji

doi:10.1086/bblv219n1p12

Cited by 3 publications

(4 citation statements)

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“…Circumferentially oriented esophageal muscles have been found to be the first developed muscle structures in all of the larval species examined and are a feature that is shared by all members of the phylum Echinodermata. Our data are consistent with the electron microscopic data and immunofluorescent staining of muscle structures in the pluteustype larva of the sea urchins Dendraster excentricus and Strongylocentrofus purpuratus (Burke 1981;Burke and Alvarez 1988) and the dipleurula-type larva of the starfish Patiria pectinifera and Pisaster ochraceus (Crawford and Martin 1998;Miguchi et al 2010). Unfortunately, myogenesis studies have not yet been performed for sea cucumber larvae.…”

Section: Comparative Anatomy Of Larval Muscle Structures In Echinodermssupporting

confidence: 91%

“…Sphincters are detectable after the esophageal muscle anlagen forms and can be identified by myosin or paramyosin Abs. Previously studies have not detected larval smooth muscles such as sphincters and star‐shaped muscles by fluorescent phalloidin or phallacidin staining (Burke and Alvarez ; Crawford and Martin ; Miguchi et al ); however, histological and ultrastructural observations of the anatomy of sea urchin pluteus sphincters have been reported (Burke ).…”

Section: Discussionmentioning

confidence: 99%

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Larval myogenesis in Echinodermata: conserved features and morphological diversity between class‐specific larval forms of Echinoidae, Asteroidea, and Holothuroidea

Dyachuk

Odintsova

2013

Evolution and Development

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The myogenesis of class-specific larval forms of three classes belonging to the phylum Echinodermata (Echinoidae, Asteroidea, and Holothuroidea) was investigated via gross-anatomy and comparative morphology of larval muscles. Using staining with phalloidin and antibodies against the muscle proteins, with subsequent CLSM and 3D imaging, we have examined myogenesis in the larvae from the gastrula stage to pre-metamorphosis larval stages. We have shown that temporal and spatial expression of muscle proteins is similar in echinoidea and asteroidea larvae but differs in holothuroidea larvae at early developmental stages. New insights regarding the protein composition of maturing muscular fibrils during development in echinoderm larvae were detected. The first differentiating muscle structures in all tested classes have been found to be circular esophageal muscles that are associated with larval feeding. During early differentiation of echinoderm larval muscle cells, we observed that the expression patterns of the muscle proteins were not uniform but with a characteristic diffuse distribution, which is typical for smooth muscle. An unusual pattern of expression of the muscle proteins was detected in larval sphincters: the thick muscle proteins were first expressed during the early developmental stages, whereas F-actin appeared at later stages. In addition, paired star-shaped muscles were revealed in the mature Echinoidae plutei, but were absent in the Asteroidea, and Holothuroidea larvae. All tested species of Echinodermata exhibited both conserved features of muscle morphology during development indicating a common life history strategy and a planktonic habitat, and also an extensive morphological diversity representing specific anatomical adaptations during development.

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Section: Comparative Anatomy Of Larval Muscle Structures In Echinodermssupporting

confidence: 91%

Section: Discussionmentioning

confidence: 99%

Larval myogenesis in Echinodermata: conserved features and morphological diversity between class‐specific larval forms of Echinoidae, Asteroidea, and Holothuroidea

Dyachuk

Odintsova

2013

Evolution and Development

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“…The transparency of the body wall also allows visualization of the formation of internal organs (Kuraishi & Osanai 1992; Tamura et al. 1998; Miguchi et al. 2010).…”

Section: Introductionmentioning

confidence: 99%

“…The embryonic and larval body of the starfish has a relatively simple organization being composed of a monolayer body wall and a single type of mesenchyme cell. The transparency of the body wall also allows visualization of the formation of internal organs (Kuraishi & Osanai 1992;Tamura et al 1998;Miguchi et al 2010). After the gastrula stage, the three germ layers, the ectoderm, endoderm and mesoderm, form various organs including the mouth, coelom, digestive tract, ciliary band, larval arms, and adult rudiment (see Results).…”

Section: Introductionmentioning

confidence: 99%

Uneven distribution pattern and increasing numbers of mesenchyme cells during development in the starfish, Asterina pectinifera

Hamanaka¹,

Hosaka²,

Kuraishi³

et al. 2011

Dev Growth Differ

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During development, the embryos and larvae of the starfish Asterina pectinifera possess a single type of mesenchyme cell. The aim of this study was to determine the patterns of behavior of mesenchyme cells during the formation of various organs. To this end, we used a monoclonal antibody (mesenchyme cell marker) to identify the distribution patterns and numbers of mesenchyme cells. Our results revealed the following: (i) mesenchyme cell behavior differs in the formation of different organs, showing temporal variations and an uneven pattern of distribution; and (ii) mesenchyme cells continue to be generated throughout development, and their numbers are tightly regulated in proportion to total cell numbers.

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Development, organization, and remodeling of phoronid muscles from embryo to metamorphosis (Lophotrochozoa: Phoronida)

Temereva

Tsitrin

2013

BMC Dev Biol

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BackgroundThe phoronid larva, which is called the actinotrocha, is one of the most remarkable planktotrophic larval types among marine invertebrates. Actinotrochs live in plankton for relatively long periods and undergo catastrophic metamorphosis, in which some parts of the larval body are consumed by the juvenile. The development and organization of the muscular system has never been described in detail for actinotrochs and for other stages in the phoronid life cycle.ResultsIn Phoronopsis harmeri, muscular elements of the preoral lobe and the collar originate in the mid-gastrula stage from mesodermal cells, which have immigrated from the anterior wall of the archenteron. Muscles of the trunk originate from posterior mesoderm together with the trunk coelom. The organization of the muscular system in phoronid larvae of different species is very complex and consists of 14 groups of muscles. The telotroch constrictor, which holds the telotroch in the larval body during metamorphosis, is described for the first time. This unusual muscle is formed by apical myofilaments of the epidermal cells. Most larval muscles are formed by cells with cross-striated organization of myofibrils. During metamorphosis, most elements of the larval muscular system degenerate, but some of them remain and are integrated into the juvenile musculature.ConclusionEarly steps of phoronid myogenesis reflect the peculiarities of the actinotroch larva: the muscle of the preoral lobe is the first muscle to appear, and it is important for food capture. The larval muscular system is organized in differently in different phoronid larvae, but always exhibits a complexity that probably results from the long pelagic life, planktotrophy, and catastrophic metamorphosis. Degeneration of the larval muscular system during phoronid metamorphosis occurs in two ways, i.e., by complete or by incomplete destruction of larval muscular elements. The organization and remodeling of the muscular system in phoronids exhibits the combination of protostome-like and deuterostome-like features. This combination, which has also been found in the organization of some other systems in phoronids, can be regarded as an important characteristic and one that probably reflects the basal position of phoronids within the Lophotrochozoa.

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Morphological Maturation Level of the Esophagus Is Associated With the Number of Circumesophageal Muscle Fibers During Archenteron Formation in the Starfish Patiria (Asterina) pectinifera

Cited by 3 publications

References 19 publications

Larval myogenesis in Echinodermata: conserved features and morphological diversity between class‐specific larval forms of Echinoidae, Asteroidea, and Holothuroidea

Larval myogenesis in Echinodermata: conserved features and morphological diversity between class‐specific larval forms of Echinoidae, Asteroidea, and Holothuroidea

Uneven distribution pattern and increasing numbers of mesenchyme cells during development in the starfish, Asterina pectinifera

Development, organization, and remodeling of phoronid muscles from embryo to metamorphosis (Lophotrochozoa: Phoronida)

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