کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
2027999 | 1070387 | 2012 | 12 صفحه PDF | دانلود رایگان |
![عکس صفحه اول مقاله: 4-Methylenesterols from Theonella swinhoei sponge are natural pregnane-X-receptor agonists and farnesoid-X-receptor antagonists that modulate innate immunity 4-Methylenesterols from Theonella swinhoei sponge are natural pregnane-X-receptor agonists and farnesoid-X-receptor antagonists that modulate innate immunity](/preview/png/2027999.png)
We report the isolation and the structural elucidation of a family of polyhydroxylated steroids from the marine sponge Theonella swinhoei. Decodification of interactions of these family with nuclear receptors shows that these steroids are potent agonists of human pregnane-X-receptor (PXR) and antagonists of human farnesoid-X-receptor (FXR) with the putative binding mode to nuclear receptors (NRs) obtained through docking experiments.By using monocytes isolated from transgenic mice harboring hPXR, we demonstrated that swinhosterol B counter-regulates induction of pro-inflammatory cytokines in a PXR-dependent manner. Exposure of CD4+ T cells to swinhosterol B upregulates the expression of IL-10 causing a shift toward a T cells regulatory phenotype in a PXR dependent manner. These results pave the way to development of a dual PXR agonist/FXR antagonist with a robust immunomodulatory activity and endowed with the ability to modulate the expression of bile acid-regulated genes in the liver.
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► Structural elucidation of polyhydroxylated steroids from the marine sponge Theonella swinhoei.
► Discovery of potent agonists of PXR and antagonists of FXR.
► The putative binding mode to nuclear receptors (NRs) has been obtained through docking calculations.
► Swinhosterol B counter-regulates induction of pro-inflammatory cytokines in a PXR-dependent manner.
Journal: Steroids - Volume 77, Issue 5, April 2012, Pages 484–495