title: Sequestration of dietary alkaloids by the spongivorous marine mollusc Tylodina perversa.
abstract: Specimens of the spongivorous Mediterranean opisthobranch Tylodina perversa that had been collected while feeding on Aplysina acerophoba were shown to sequester the brominated isoxazoline alkaloids of their prey. Alkaloids were stored in the hepatopancreas, mantle tissues, and egg masses in an organ-specific manner. Surprisingly, the known sponge alkaloid aerothionin which is found only in A. cavernicola but not in A. aerophoba was also among the metabolites identified in wild caught specimens of T. perversa as well as in opisthobranchs with a documented feeding history on A. aerophoba. Mollusc derived aerothionin is postulated to be derived from a previous feeding encounter with A. cavernicola as T. perversa was found to freely feed on both Aplysina sponges in aquarium bioassays. The possible ecological significance of alkaloid sequestration by T. perversa is still unknown.
authors.affiliation: Institut für Pharmazeutische Biologie, Universität Düsseldorf, Universitätsstrasse 1, Geb. 26.23, D-40225 Düsseldorf, Germany.
authors.forename: Carsten
authors.initials: C
authors.lastname: Thoms
authors.forename: Rainer
authors.initials: R
authors.lastname: Ebel
authors.forename: Ute
authors.initials: U
authors.lastname: Hentschel
authors.forename: Peter
authors.initials: P
authors.lastname: Proksch
mesh_terms: D000470:Alkaloids / Q000737:chemistry / Q000378:metabolism*; D000818:Animals; D001048:Aplysia; D018533:Biomass; D002851:Chromatography, High Pressure Liquid; D004032:Diet; D004064:Digestive System / Q000378:metabolism; D005260:Female; D007555:Isoxazoles / Q000378:metabolism; D019083:Mediterranean Region; D015394:Molecular Structure; D008974:Mollusca / Q000502:physiology*; D009928:Organ Specificity; D010063:Ovum / Q000737:chemistry / Q000378:metabolism
chemical_list: D000470:Alkaloids; D007555:Isoxazoles