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Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)
 
 
 

The immunomodulator AS-101 inhibits IL-10 release and augments TNF alpha and IL-1 alpha release by mouse and human mononuclear phagocytes.

AS-101 is a tellurium-based compound with known immunomodulating properties. The ability of AS-101 to potentiate the effects of chemotherapeutic drugs and augment cytokine production in vivo has led to clinical trials on AS-101 which are currently being carried out in cancer patients. In the present study we show that AS-101 selectively augments the release of TNF alpha and IL-1 alpha and inhibits the release of IL-10 by lipopolysaccharide (LPS)-stimulated mouse peritoneal macrophages and human monocytes. It does not significantly affect the release of IL-6 or leukemia inhibitory factor ( LIF). By itself AS-101 does not induce the release of any of these cytokines. Analysis of IL-10 and TNF alpha RNA levels using semiquantitative PCR reveals that AS-101 blocks the transcription of IL-10 mRNA, but does not significantly affect TNF alpha mRNA. Although both AS-101 and interferon (IFN)-gamma inhibit IL-10, AS-101, unlike IFN-gamma, does not prime macrophages for LPS-induced nitric oxide release and does not appear to significantly affect monocyte HLA-DR expression. Our data suggest that AS-101 is a partial IFN-gamma agonist and may explain the shift toward the release of Th-1 type cytokines observed in AS-101-treated patients.[1]

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