BHPI

• CAT Number: I004114
• CAS Number: 56632-39-4
• Molecular Formula: C21H17NO3
• Molecular Weight: 331.36
• Purity: ≥95%
• Synonyms: 3,3-bis(4-hydroxyphenyl)-7-methyl-1H-indol-2-one
• InChI: InChI=1S/C21H17NO3/c1-13-3-2-4-18-19(13)22-20(25)21(18,14-5-9-16(23)10-6-14)15-7-11-17(24)12-8-15/h2-12,23-24H,1H3,(H,22,25)
• InChIKey: FABLAHMQSQFDHR-UHFFFAOYSA-N
• SMILES: CC1=C2C(=CC=C1)C(C(=O)N2)(C3=CC=C(C=C3)O)C4=CC=C(C=C4)O

BHPI is a potent inhibitor of nuclear estrogen–ERα-regulated gene expression; elicits sustained ERα-dependent activation of the endoplasmic reticulum (EnR) stress sensor, the unfolded protein response (UPR), and persistent inhibition of protein synthesis.
IC50 value:
Target: ERα inhibitor
BHPI is effective because it elicits sustained ERα-dependent activation of the endoplasmic reticulum (EnR) stress sensor, the unfolded protein response (UPR), and persistent inhibition of protein synthesis. BHPI distorts a newly described action of estrogen-ERα: mild and transient UPR activation. In contrast, BHPI elicits massive and sustained UPR activation, converting the UPR from protective to toxic. In ERα(+) cancer cells, BHPI rapidly hyperactivates plasma membrane PLCγ, generating inositol 1,4,5-triphosphate (IP3), which opens EnR IP3R calcium channels, rapidly depleting EnR Ca(2+) stores.

Reference

[1]. Andruska ND, et al. Estrogen receptor α inhibitor activates the unfolded protein response, blocks protein synthesis, and induces tumor regression. Proc Natl Acad Sci U S A. 2015 Apr 14;112(15):4737-42.
 [Content Brief]