Australian marine sponge alkaloids as a new class of glycine-gated chloride channel receptor modulator

Md Islam, Walter Balansa, Daniel F Gilbert, Frank Fortaine, Xue Xiao, Hua Zhang, Andrew M Piggott, Joseph W Lynch, Robert J Capon

Research output: Contribution to journalArticlepeer-review


Chemical analysis of a specimen of the sponge Ianthella cf. flabelliformis returned two new sesquiterpene glycinyl lactams, ianthellalactams A (1) and B (2), the known sponge sesquiterpene dictyodendrillin (3) and its ethanolysis artifact ethyl dictyodendrillin (4), and five known sponge indole alkaloids, aplysinopsin (5), 8E-3′-deimino-3′-oxoaplysinopsin (6), 8Z-3′-deimino-3′-oxoaplysinopsin (7), dihydroaplysinopsin (8) and tubastrindole B (9). The equilibrated mixture 6/7 exhibited glycine-gated chloride channel receptor (GlyR) antagonist activity with a bias towards α3 over α1 GlyR, while tubastrindole B (9) exhibited a bias towards α1 over α3 GlyR. At low- to sub-micromolar concentrations, 9 was also a selective potentiator of α1 GlyR, with no effect on α3 GlyR—a pharmacology that could prove useful in the treatment of movement disorders such as spasticity and hyperekplexia. Our investigations into the GlyR modulatory properties of 1–9 were further supported by the synthesis of a number of structurally related indole alkaloids.
Original languageEnglish
Pages (from-to)4420-4425
Number of pages6
JournalBioorganic and Medicinal Chemistry
Issue number14
Publication statusPublished - 2013
Externally publishedYes


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