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Official Journal of the Italian Society of Dermatology and Sexually Transmitted Diseases
Indexed/Abstracted in: EMBASE, PubMed/MEDLINE, Science Citation Index Expanded (SciSearch), Scopus
Impact Factor 1,014
Online ISSN 1827-1820
Kokelj F. 1, Avian M. 2, Martinelli E. 1, Sartini S. 2, Trevisan G. 1
1 Institute of Dermatology University of Trieste, Trieste, Italy
2 Department of Biology University of Trieste, Trieste, Italy
Aim. Rhizostoma pulmo is a jellyfish very common along the Mediterranean Sea coasts, that can cause mild dermatitis to bathers. It has a simple structure with a dome-shaped umbrella and 8 oral arms. The tentacles contain the nematocysts in which the toxins are present. Till now the toxins of this jellyfish have not been completely identified but their hemolytic and cytotoxic activity has been reported.
Methods. In the present study we analyzed, by means of optic and scanning electron microscope , the nematocysts of some specimens of Rhizostoma pulmo from the Gulf of Trieste. Pieces of marginal lappets and mouth-arms were excised from freshly caught specimens and immersed, separately, in cold distilled water, left to macerate and then homogenized; the resulting suspension was filtered and centrifuged and then frozen.
Results. We identified 3 different types of nematocysts, isolated from Rhizostoma pulmo’ s marginal lobes and oral arms: olotrichous isorhiza haploneme, eterotrichous microbasic eurytele, atrichous isorhiza haploneme; the last two types are described for the first time in this paper. The microscopic analysis has made it possible to prove the presence of different concentrations of toxins in these 3 types.
Conclusion. These data will allow more focused chemical and toxicological studies in the future in order to improve our knowledge in this field.