Induction of metamorphosis by bacteria and by a lithium-pulse in the larvae ofHydractinia echinata (Hydrozoa)

Spindler, K.-D.; Müller, Werner A.

doi:10.1007/bf00580249

Cited by 67 publications

(16 citation statements)

References 17 publications

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“…Monovalent cations such as K+ and Cs+ are well known as artificial inducers of metamorphosis of different hydroid species (Spindler and Muller, 1972;Muller and Buchal, 1973;Freeman and Ridgway, 1990;Schwoerer-Böhning et al, 1990). Therefore the larval nervous system is involved in signal reception, at the level of electrically excitable cells and there is evidence that it also participates in the signal transduction pathway of metamorphosis (Hadfield, 1998(Hadfield, , 2000.…”

Section: Introductionmentioning

confidence: 99%

Serotonin involvement in the metamorphosis of the hydroid Eudendrium racemosum

Zega

Pennati²,

Fanzago³

et al. 2007

Int. J. Dev. Biol.

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Hydroid planulae metamorphose in response to an inducing external stimulus, usually a bacterial cue. There is evidence that neurotransmitters participate in the signal transduction pathway of hydroid metamorphosis. Eudendrium racemosum is a colonial hydroid common in the Mediterranean Sea. It lacks the medusa stage and the planulae develop on female colonies during the fertile season. In this work, serotonin (5-HT) was localized in some planula ectodermal cells. Co-localization of serotonin and β-tubulin suggested that 5-HT was present in sensory nervous cells and in different ectodermal cells. To investigate the role of neurotransmitters in metamorphosis, E. racemosum planulae were treated with serotonin and dopamine and with agonists and antagonists of the corresponding receptors. Serotonin and a serotonin receptor agonist induced metamorphosis, while a 5-HT receptor antagonist inhibited it. Dopamine and all dopaminergic drugs used did not show any significant effect on the onset of metamorphosis. Results from this work showed that 5-HT could stimulate metamorphosis in E. racemosum planulae in the presence of a natural inducer. A mechanism by which this neurotransmitter could act in this phase is proposed.

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Section: Introductionmentioning

confidence: 99%

Serotonin involvement in the metamorphosis of the hydroid Eudendrium racemosum

Zega

Pennati²,

Fanzago³

et al. 2007

Int. J. Dev. Biol.

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“…2D), suggesting the lack of basal tissues required for attachment. These results reveal that tissue identity along the oral aboral axis in the planula is directly reflected in the tissue organization of the primary polyp, in other words, the transition of tissue identity, or transdifferentiation, rarely happens during metamorphosis processes, as in H. echinata (Spindler and Müller 1972).…”

Section: Resultsmentioning

confidence: 82%

Aboral localization of responsiveness to a metamorphic neuropeptide in the planula larva of Acropora tenuis

Matsushima

Kiyomoto

Hatta

2010

Galaxea, Journal of Coral Reef Studies

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“…H. echinata responded to Li + -enriched seawater with metamorphosis in a dose-response curve showing an optimum at about 150 mM. Concentrations at and above the optimum harmed the animals (Spindler and Müller 1972).…”

Section: + Enrichmentmentioning

confidence: 99%

Induction of metamorphosis from the larval to the polyp stage is similar in Hydrozoa and a subgroup of Scyphozoa (Cnidaria, Semaeostomeae)

2000

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Larvae of cnidarians need an external cue for metamorphosis to start. The larvae of various hydrozoa, in particular of Hydractinia echinata, respond to Cs + , Li + , NH 4 + and seawater in which the concentration of Mg 2+ ions is reduced. They further respond to the phorbolester, tetradecanoyl-phorbol-13-acetate (TPA) and the diacylglycerol (DAG) diC8, which both are argued to stimulate a protein kinase C. The only well-studied scyphozoa, Cassiopea spp., respond differently, i.e. to TPA and diC8 only. We found that larvae of the scyphozoa Aurelia aurita, Chrysaora hysoscella and Cyanea lamarckii respond to all the compounds mentioned. Trigonelline (N-methylnicotinic acid), a metamorphosis inhibitor found in Hydractinia larvae, is assumed to act by delivering a methyl group for transmethylation processes antagonising metamorphosis induction in Chrysaora hysoscella and Cyanea lamarckii. The three species tested are scyphozoa belonging to the subgroup of semaeostomeae, while Cassiopea spp. belong to the rhizostomeae. The results obtained may contribute to the discussion concerning the evolution of cnidarians and may help to clarify whether the way metamorphosis can be induced in rhizostomeae as a whole is different from that in hydrozoa and those scyphozoa belonging to the subgroup semaeostomeae.

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Induction of metamorphosis by bacteria and by a lithium-pulse in the larvae ofHydractinia echinata (Hydrozoa)

Cited by 67 publications

References 17 publications

Serotonin involvement in the metamorphosis of the hydroid Eudendrium racemosum

Serotonin involvement in the metamorphosis of the hydroid Eudendrium racemosum

Aboral localization of responsiveness to a metamorphic neuropeptide in the planula larva of Acropora tenuis

Induction of metamorphosis from the larval to the polyp stage is similar in Hydrozoa and a subgroup of Scyphozoa (Cnidaria, Semaeostomeae)

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