title: Potent inhibitors of pro-inflammatory cytokine production produced by a marine-derived bacterium.
abstract: Cytokines produced through the antigen presenting cell (APC)-T-cell interaction play a key role in the activation of the allergic asthmatic response. Evaluating small molecules that inhibit the production of these pro-inflammatory proteins is therefore important for the discovery of novel chemical structures with potential antiasthma activity. We adapted a mouse splenocyte cytokine assay to screen a library of 2,500 marine microbial extracts for their ability to inhibit T(H)2 cytokine release and identified potent activity in a marine-derived strain CNQ431, identified as a Streptomyces species. Bioactivity guided fractionation of the organic extract of this strain led to the isolation of ten new 9-membered bis-lactones, splenocins A-J (1-10). The new compounds display potent biological activities, comparable to that of the corticosteroid dexamethasone, with IC(50) values from 2 to 50 nM in the splenocyte cytokine assay. This study provides the foundation for the optimization of these potent anti-inflammatory compounds for development in the treatment of asthma.
authors.affiliation: Center for Marine Biotechnology and Biomedicine, Scripps Institution of Oceanography, University of California, San Diego, La Jolla, California 92093-0204, USA.
authors.forename: Wendy K
authors.initials: WK
authors.lastname: Strangman
authors.forename: Hak Cheol
authors.initials: HC
authors.lastname: Kwon
authors.forename: David
authors.initials: D
authors.lastname: Broide
authors.forename: Paul R
authors.initials: PR
authors.lastname: Jensen
authors.forename: William
authors.initials: W
authors.lastname: Fenical