The short life of the Hoyle organ of Sepia officinalis: formation, differentiation and degradation by programmed cell death

Autor(en)

Norbert Cyran, Anna Palumbo, Waltraud Klepal, Erica A. G. Vidal, Yannick Staedler, Jürg Schönenberger, Janek von Byern

Abstrakt

Cephalopods encapsulate their eggs in protective egg envelopes. To hatch from this enclosure, most cephalopod embryos release egg shell-digesting choriolytic enzymes produced by the Hoyle organ (HO). After hatching, this gland becomes inactive and rapidly degrades by programmed cell death. We aim to characterize morphologically the development, maturation and degradation of the gland throughout embryonic and first juvenile stages in Sepia officinalis. Special focus is laid on cell death mechanisms and the presence of nitric oxide synthase during gland degradation. Hatching enzyme has been examined in view of metallic contents, commonly amplifying enzyme effectiveness. HO gland cells are first visualized at embryonic stage 23; secretion is observed from stage 27 onwards. Degradation of the HO occurs after hatching within two days by the rarely observed autophagic process, recognized for the first time in cephalopods. Nitric oxide synthase immunopositivity was not found in the HO cells after hatching, suggesting a possible NO role in cell death signalling. Although the HO ‘life course’ chronology in S. officinalis is similar to other cephalopods, gland degradation occurs by autophagy instead of necrosis. Eggs that combine a large perivitelline space and multi-layered integument seem to require a more complex and large gland system.

Organisation(en)

Department für Botanik und Biodiversitätsforschung

Externe Organisation(en)

Stazione Zoologica Anton Dohrn, Federal University of Parana

Journal

Hydrobiologia: the international journal on limnology and marine sciences

Band

808

Seiten

35-55

Anzahl der Seiten

21

ISSN

0018-8158

DOI

https://doi.org/10.1007/s10750-017-3291-3

Publikationsdatum

02-2018

Peer-reviewed

Ja

ÖFOS 2012

106049 Ultrastrukturforschung, 106012 Evolutionsforschung, 106052 Zellbiologie, 106010 Entwicklungsbiologie

Schlagwörter

ASJC Scopus Sachgebiete

Aquatic Science

Link zum Portal

https://ucris.univie.ac.at/portal/de/publications/the-short-life-of-the-hoyle-organ-of-sepia-officinalis-formation-differentiation-and-degradation-by-programmed-cell-death(7bb37229-bdd2-4b35-a0ba-1edce5ccc03b).html