The ontogeny of synaptophysin expression patterns on the GABAergic ciliary band-associated strand during larval development of the sea urchin, Hemicentrotus pulcherrimus A. Agassiz, 1864

Zoomorphology ◽  
2018 ◽  
Vol 138 (1) ◽  
pp. 117-126 ◽  
Author(s):  
Hideki Katow ◽  
Tomoko Katow ◽  
Masato Kiyomoto
Keyword(s):  
Larval Development ◽  
Sea Urchin ◽  
Expression Patterns ◽  
Ciliary Band ◽  
Hemicentrotus Pulcherrimus

scholarly journals Effects of Glyphosate-Based and Derived Products on Sea Urchin Larval Development

2020 ◽  
Vol 8 (9) ◽  
pp. 661
Author(s):  
Davide Asnicar ◽  
Costanza Cappelli ◽  
Ahmad Safuan Sallehuddin ◽  
Nur Atiqah Maznan ◽  
Maria Gabriella Marin
Keyword(s):  
Larval Development ◽  
Sea Urchin ◽  
Marine Invertebrates ◽  
Parent Compound ◽  
Paracentrotus Lividus ◽  
Marine Species ◽  
Negative Effects ◽  
Aminomethylphosphonic Acid ◽  
Main Degradation Product ◽  
Herbicide Glyphosate

Despite the widespread use of herbicide glyphosate in cultivation, its extensive runoff into rivers and to coastal areas, and the persistence of this chemical and its main degradation product (aminomethylphosphonic acid, AMPA) in the environment, there is still little information on the potential negative effects of glyphosate, its commercial formulation Roundup® and AMPA on marine species. This study was conducted with the aim of providing a comparative evaluation of the effects of glyphosate-based and its derived chemicals on the larval development of the sea urchin Paracentrotus lividus, thus providing new data to describe the potential ecotoxicity of these contaminants. In particular, the effects on larval development, growth and metabolism were assessed during 48 h of exposure from the time of egg fertilization. The results confirm that AMPA and its parent compound, glyphosate have similar toxicity, as observed in other marine invertebrates. However, interestingly, the Roundup® formulation seemed to be less toxic than the glyphosate alone.

scholarly journals Involvement of Huntingtin in Development and Ciliary Beating Regulation of Larvae of the Sea Urchin, Hemicentrotus pulcherrimus

2021 ◽  
Vol 22 (10) ◽  
pp. 5116
Author(s):  
Hideki Katow ◽  
Tomoko Katow ◽  
Hiromi Yoshida ◽  
Masato Kiyomoto
Keyword(s):  
Sea Urchin ◽  
The Body ◽  
Brdu Incorporation ◽  
Wild Type ◽  
Blastula Stage ◽  
Ciliary Beating ◽  
Marker Proteins ◽  
Disease Protein ◽  
Pattern Regulation ◽  
Hemicentrotus Pulcherrimus

The multiple functions of the wild type Huntington’s disease protein of the sea urchin Hemicentrotus pulcherrimus (Hp-Htt) have been examined using the anti-Hp-Htt antibody (Ab) raised against synthetic oligopeptides. According to immunoblotting, Hp-Htt was detected as a single band at around the 350 kDa region at the swimming blastula stage to the prism larva stage. From the 2-arm pluteus stage (2aPL), however, an additional smaller band at the 165 kDa region appeared. Immunohistochemically, Hp-Htt was detected in the nuclei and the nearby cytoplasm of the ectodermal cells from the swimming blastula stage, and the blastocoelar cells from the mid-gastrula stage. The Ab-positive signal was converged to the ciliary band-associated strand (CBAS). There, it was accompanied by several CBAS-marker proteins in the cytoplasm, such as glutamate decarboxylase. Application of Hp-Htt morpholino (Hp-Htt-MO) has resulted in shortened larval arms, accompanied by decreased 5-bromo-2-deoxyuridin (BrdU) incorporation by the ectodermal cells of the larval arms. Hp-Htt-MO also resulted in lowered ciliary beating activity, accompanied by a disordered swirling pattern formation around the body. These Hp-Htt-MO-induced deficiencies took place after the onset of CBAS system formation at the larval arms. Thus, Hp-Htt is involved in cell proliferation and the ciliary beating pattern regulation signaling system in pluteus larvae.

Tension at the Surface of Sea-Urchin Egg: A Critical Examination of Cole's Experiment

1964 ◽  
Vol 41 (4) ◽  
pp. 893-906 ◽  
Author(s):  
MITSUKI YONEDA
Keyword(s):  
Surface Area ◽  
Sea Urchin ◽  
Contact Area ◽  
Surface Force ◽  
Critical Examination ◽  
Compression Method ◽  
Osmotic Swelling ◽  
Technical Errors ◽  
Sea Urchin Egg ◽  
Hemicentrotus Pulcherrimus

1. The compression method for calculating the surface force of the sea-urchin egg, developed by Cole (1932), has been critically repeated using unfertilized eggs of Hemicentrotus pulcherrimus. 2. Estimation of contact area involved in Cole's equation introduces technical errors. 3. The tension recalculated by another equation including surface area as a parameter is found to remain constant irrespective of change in surface area. This is in conflict with the classical belief that the cortex of the egg of sea urchin is elastic. 4. Neither osmotic swelling nor osmotic shrinkage of the egg affects the tension.

Change in Na+, K+ -ATPase activity in embryos of the sea urchin, Hemicentrotus pulcherrimus, during early development

2020 ◽  
pp. 391-391
Author(s):  
K. Mitsunaga ◽  
M. Hatoh ◽  
K. Yamazaki ◽  
I. Yasumasu ◽  
K. Yamada ◽  
...  
Keyword(s):  
Atpase Activity ◽  
Early Development ◽  
Sea Urchin ◽  
Hemicentrotus Pulcherrimus
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