HPOB is a highly potent and selective inhibitor of HDAC6 with an IC50 of 56 nM. HPOB displays >30 fold less potent against other HDACs. HPOB enhances the effectiveness of DNA-damaging anticancer agents in transformed cells but not normal cells. HPOB does not block the ubiquitin-binding activity of HDAC6.
IC50&Target
HDAC6
0.056 μM (IC50)
HDAC3/NCOR2
1.7 μM (IC50)
HDAC8
2.8 μM (IC50)
HDAC1
2.9 μM (IC50)
HDAC10
3.0 μM (IC50)
HDAC2
4.4 μM (IC50)
体外研究
HPOB (8, 16, or 32 μM; 72 hours) inhibits growth, however, not viability, of normal or transformed cells.
In normal (HFS) and transformed (LNCAP, U87, and A549) cells, HPOB causes accumulation of acetylated α-tubulin and acetylated peroxiredoxin, substrates of HDAC6, but not of acetylated histones. HPOB enhances etoposide-, doxorubicin-, and SAHA-induced transformed cell ((LNCAP, U87, and A549 cells) death but not normal cell death.
In LNCaP cells cultured with HPOB and etoposide, there was an increase in cleaved PARP, a marker of apoptosis. Combination of HPOB with etoposide increased the accumulation of DNA damage compared with etoposide alone as evidenced by accumulation of γH2AX in LNCaP cells.
HPOB attenuates corticosterone-induced injury in rat adrenal pheochromocytoma PC12 cells by inhibiting mitochondrial GR translocation and the intrinsic apoptosis pathway.
Cell Proliferation Assay
Cell Line:
Normal human foreskin fibroblast (HFS), LNCaP, A549, U87 cells
Concentration:
8, 16, or 32 μM
Incubation Time:
72 hours
Result:
Inhibited cell growth of normal and transformed cells in a concentration-dependent manner but do not induce cell death of normal or transformed cells.
体内研究
HPOB (300 mg/kg; i.p.; daily for 18 days) and SAHA (50 mg/kg) causes suppression of the growth of established CWR22 tumors.
Animal Model:
Nude mice (CWR22 human prostate cancer xenograf)
Dosage:
300 mg/kg
Administration:
I.p.; daily for 18 days
Result:
Combination with SAHA showed significant shrinkage of CWR22 tumors.
分子式
C17H18N2O4
分子量
314.34
CAS号
1429651-50-2
运输条件
Room temperature in continental US; may vary elsewhere.