AS1517499 is a STAT6 inhibitor (IC50 = 21 nM in a reporter assay). It inhibits IL-4-induced Th2 differentiation (IC50 = 2.3 nM), but not IL-12-induced Th1 differentiation, of mouse spleen T cells. AS1517499 (10 mg/kg) inhibits bronchial smooth muscle hyperresponsiveness and IL-13 production in ovalbumin-sensitized mice when administered one hour prior to antigen exposure. It inhibits STAT6 phosphorylation and thyroid epithelial cell (TEC) hyperplasia and decreases serum levels of 3,3'',5-triiodo-L-thyronine (T3; ) and thyroxine (T4) in a mouse model of Graves'' disease when administered at a dose of 10 mg/kg per day. AS1517499 (20 mg/kg twice weekly) also inhibits tumor growth and liver metastasis in a murine orthotopic 4T1 mammary carcinoma model.
Biochem/physiol Actions
AS1517499 moderately inhibits the expression of RhoA (ras homolog family member A). Overexpression of RhoA protein is associated with allergic bronchial asthma.
