OATP1B1 plays an important role in the transport and treatment efficacy
of sorafenib in hepatocellular carcinoma
Abstract
ABSTRACT Background: Sorafenib is an anticancer drug used in the
treatment of unresectable hepatocellular carcinoma and advanced renal
cell carcinoma. It is a substrate for the human OATP1B1. This study
aimed to assess the role of OATP1B1 in transportation and uptake of
sorafenib in hepatocellular carcinoma and how OATP1B1 affects the
pharmacodynamics of sorafenib in vitro and in vivo. Methods: Sorafenib
transport was measured in HepG2, HepG2-OATP1B1*1a, HepG2-OATP1B1*1b,
HepG2-OATP1B1*15, LO2, LO2-OATP1B1*1a, LO2-OATP1B1*1b, and
LO2-OATP1B1*15 cells, as well as in HepG2 cells transfected with
miR-148a mimics. The cell viability and apoptosis rate of cells treated
with sorafenib were evaluated. A liver cancer rat model was established
to explore the pharmacokinetics and pharmacodynamics of sorafenib after
overexpression of Oatp2. Results: Changes in expression and genetic
mutations of OATP1B1 significantly affected the uptake of sorafenib in
HepG2 and LO2 transgenic cells, and sorafenib uptake by HepG2 was higher
than that by LO2. Genetic mutations of OATP1B1 significantly affected
the cell viability and apoptosis rate of HepG2 cells after sorafenib
treatment. Compared to control HepG2 cells, miR-148a mimic-transfected
HepG2 cells had decreased sorafenib uptake. The inhibitory effect of
sorafenib on cell growth was weakened. PCN significantly increased the
expression of Oatp2 and affected the pharmacokinetics of sorafenib.
Vascular endothelial growth factor levels and microvascular density in
tumor-adjacent tissues decreased significantly, suggesting that
increased Oatp2 expression improves the treatment effect of sorafenib in
a rat model of liver cancer. Conclusions: OATP1B1 plays an important
role in the pharmacokinetics and pharmacodynamics of sorafenib in
hepatocellular carcinoma.