JAK - STAT3

AG 490 is a selective inhibitor of EGF receptor tyrosine kinase (IC50 values are 2 and 13.5 μM for EGFR and ErbB2 respectively). Also inhibits JAK2 with no activity to Lck, Lyn, Btk, Syk and Src.

Cucurbitacin I, Cucumis sativus L. has been found to suppress levels of phosphotyrosine Stat3 (signal transducer and activator of transcription 3) in v-Src-transformed NIH 3T3 cells.

SD 1008 is reported to be a JAK2/STAT3 signaling pathway inhibitor which additionally inhibits Src. SD 1008 is noted to induce apoptosis in cell lines that express constitutively active tyrosine-phosphorylated STAT3.

FLLL32 is a potent JAK2/STAT3 inhibitor with IC50 of <5 uM.

Protosappanin A is an immunosuppressive ingredient of the medicinal herb Caesalpinia sappan L.