Click here to close Hello! We notice that you are using Internet Explorer, which is not supported by Echinobase and may cause the site to display incorrectly. We suggest using a current version of Chrome, FireFox, or Safari.
Echinobase
ECB-ART-47847
Int J Dev Biol 2002 Sep 01;466:801-6.
Show Gene links Show Anatomy links

Physiological and induced apoptosis in sea urchin larvae undergoing metamorphosis.

Roccheri MC , Tipa C , Bonaventura R , Matranga V .


???displayArticle.abstract???
Paracentrotus lividus embryos at the early pluteus stage undergo spontaneous apoptosis. Using a TUNEL (TdT-mediated dUTP Nick-End Labelling) assay on whole mount embryos, we showed that there was a different distribution of the apoptotic cells in different optical sections. Not more than 20% of cells in plutei were spontaneously apoptotic, as confirmed by the counts of dissociated ectoderm and intestine cells. Observation of larva stages closer to metamorphosis confirmed that apoptosis is a physiological event for the development of the adult. In particular, larvae at different developmental stages showed apoptotic cells in the oral and aboral arms, intestine, ciliary band and both apical and oral ganglia. Moreover, we found that the number of apoptotic cells decreased in later larva stages, possibly because in the organism approaching metamorphosis, a smaller number of cells needs to be eliminated. Furthermore, combined phorbol ester (TPA) and heat shock treatment enhanced apoptosis by increasing the number of cells involved in the phenomenon.

???displayArticle.pubmedLink??? 12382946



Genes referenced: LOC100887844