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Hirsutinolide series inhibit Stat3 activity, alter GCN1, MAP1B, Hsp105, G6PD, vimentin, TrxR1, and importin ?-2 expression, and induce antitumor effects against human glioma #MMPMID26331426
J Med Chem 2015[Oct]; 58 (19): 7734-48 PMID26331426show ga
We report that hirsutinolides series, 6, 7, 10, 11, 20 and 22 and the semi-synthetic analogs, 30, 31, 33 and 36 inhibit constitutively-active Signal transducer and activator of transcription (Stat)3 and malignant glioma phenotype. A position 13 lipophilic ester group is required for activity. Molecular modeling and NMR structural analyses reveal direct hirsutinolide:Stat3 binding. One-hour treatment of cells with 6 and 22 also upregulated importin subunit ?-2 levels and repressed translational activator GCN1, microtubule-associated protein (MAP)1B, thioredoxin reductase (TrxR)1 cytoplasmic isoform 3, glucose-6-phosphate 1-dehydrogenase isoform a, Hsp105, vimentin, and tumor necrosis factor ?-induced protein (TNAP)2 expression. Active hirsutinolides inhibited anchorage-dependent and 3D-spheroid growth, survival, and migration of human glioma lines and glioma patients? tumor-derived xenograft cells harboring constitutively-active Stat3. Oral gavage delivery of 6 or 22 inhibited human glioma tumor growth in subcutaneous mouse xenografts. The inhibition of Stat3 signaling represents part of the hirsutinolide-mediated mechanisms to induce antitumor effects.