The nuclear receptor constitutive active/androstane receptor arrests DNA-damaged human hepatocellular carcinoma Huh7 cells at the G2/M phase.

Abstract:

:Here, we have demonstrated that xenobiotic activation of the nuclear receptor (CAR, NR1I3) can result in arresting DNA-damaged human hepatocellular carcinoma Huh7 cells at the G2/M phase. Huh7 cells over-expressing CAR were either treated with dimethyl sulfoxide, the CAR activator TCPOBOP (1,4-bis[2-(3,5-dichloropyridyloxy)]benzene; androstenol, 16,(5α)-androsten-3α-OL), or repressor androstenol; these treatments were then followed by adriamycin treatment to damage DNA. FACS analysis revealed that CAR-activation by TCPOBOP increased the rate of arrested Huh7 cells at the G2/M phase (4N DNA content) after DNA damage by adriamycin. This increase correlated with the increase of cell viability in TCPOBOP-treated Huh7 cells, as determined by MTT assays. Real-time polymerase chain reaction analysis determined that, as regulated by CAR, the growth arrest and DNA damage-inducible γ (GADD45γ) and Cyclin G2 genes increased and decreased, respectively, as TCPOBOP increased the number of Huh7 cells arrested at the G2/M phase. Thus, the results suggest that CAR regulates cell cycle, increasing G2/M arrest, and delaying the death of DNA-damaged cells.

journal_name

Mol Carcinog

journal_title

Molecular carcinogenesis

authors

Kamino H,Negishi M

doi

10.1002/mc.20783

subject

Has Abstract

pub_date

2012-02-01 00:00:00

pages

206-12

issue

2

eissn

0899-1987

issn

1098-2744

journal_volume

51

pub_type

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