, Volume 88, Issue 1, pp 27-32

Exudation of biologically-active metabolites in the sponge Aplysina fistularis

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Specimens of the demosponge Aplysina fistularis forma fulva (Pallas) from the intertidal zone at La Jolla, California, USA, contain two antimicrobial metabolites, aerothionin (1) and homoaerothionin (2). Both metabolites are exuded into seawater. The rates of exudation into artificial seawater were measured under near in situ conditions (7.7x10-4 μg aerothionin min-1 g-1 dry weight of sponge) and in an aquarium (8.9x10-3 μg min-1 g-1) for undamaged sponges. Sponges responded to a simulated injury by exuding 10 to 100 times as much of these metabolites. The exudation of aerothionin and homoaerothionin may inhibit surface overgrowth by fouling organisms and tissue damage by mobile animals.

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