Fig. 1. ESI-MS/MS spectra of β-estradiol and β-estradiol-S-O-glucuronide, and UGT1A1-mediated β-estradiol-O-glucuronidation in HeLa1A1 cells.
(A) ESI-MS/MS spectra of β-estradiol and β-estradiol-3-O-glucuronide in negative ion mode; (B) Excreted β-estradiol-3-O-glucuronide in extracellular solution at two concentrations of propofol (5 and 20 μM); (C) Excreted rates of β-estradiol-3-O-glucuronide at different concentrations (5 and 20 μM); Data were presented as mean ± SD. *p < 0.05, **p < 0.01 or ***p < 0.001 compared with that of β-estradiol (5 μM).