Effect of aflatoxin B1 on UDP-glucuronosyltransferase mRNA expression in HepG2 cells

Nobumitsu Hanioka, Yuko Nonaka, Keita Saito, Tomoe Negishi, Keinosuke Okamoto, Hiroyuki Kataoka, Shizuo Narimatsu

Research output: Contribution to journalArticle

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Abstract

Aflatoxin B1 (AFB1) is a potent mycotoxin that induces hepatocellular carcinoma in many animal species, including humans. In this study, we examined the effects of AFB1 on UDP-glucuronosyltransferase (UGT) mRNA expression in HepG2 cells (human hepatocellular carcinoma cell line). The cells were treated with AFB1 for 48. h at a concentration of 10 μM, and their viability (87%) was not significantly different from that of control cells. Reverse transcription polymerase chain reaction (RT-PCR) analysis demonstrated that the mRNAs of four UGT1As (UGT1A1, UGT1A3, UGT1A4 and UGT1A9) and seven UGT2Bs (UGT2B4, UGT2B7, UGT2B10, UGT2B11, UGT2B15, UGT2B17 and UGT2B28) are expressed in HepG2 cells. The mRNAs of aryl hydrocarbon receptor (AhR), pregnane X receptor (PXR), retinoid X receptor (RXR) and glucocorticoid receptor (GR) as transcriptional regulators were also detected. AFB1 significantly increased mRNA levels of UGT1A3, UGT2B10, UGT2B15 and UGT2B17 in HepG2 cells to 2.5-, 2.0-, 1.9- and 1.5-fold, respectively, whereas the mRNA levels of transcriptional regulators were hardly affected by AFB1. These findings suggest that AFB1 induces UGT2B isoforms rather than UGT1A isoforms in HepG2 cells, and that the change may closely contribute to the toxicity of AFB1.

Original languageEnglish
Pages (from-to)526-529
Number of pages4
JournalChemosphere
Volume89
Issue number5
DOIs
Publication statusPublished - Oct 2012

Fingerprint

Aflatoxins
Glucuronosyltransferase
Aflatoxin B1
Hep G2 Cells
polymerase chain reaction
viability
hydrocarbon
toxicity
fold
Messenger RNA
Hepatocellular Carcinoma
Protein Isoforms
Retinoid X Receptors
Aryl Hydrocarbon Receptors
Mycotoxins
Polymerase chain reaction
Glucocorticoid Receptors
Transcription
animal species
effect

Keywords

  • Aflatoxin B1 (AFB1)
  • HepG2 cells
  • MRNA expression
  • UDP-glucuronosyltransferase (UGT)

ASJC Scopus subject areas

  • Environmental Chemistry
  • Chemistry(all)

Cite this

Hanioka, N., Nonaka, Y., Saito, K., Negishi, T., Okamoto, K., Kataoka, H., & Narimatsu, S. (2012). Effect of aflatoxin B1 on UDP-glucuronosyltransferase mRNA expression in HepG2 cells. Chemosphere, 89(5), 526-529. https://doi.org/10.1016/j.chemosphere.2012.05.039

Effect of aflatoxin B1 on UDP-glucuronosyltransferase mRNA expression in HepG2 cells. / Hanioka, Nobumitsu; Nonaka, Yuko; Saito, Keita; Negishi, Tomoe; Okamoto, Keinosuke; Kataoka, Hiroyuki; Narimatsu, Shizuo.

In: Chemosphere, Vol. 89, No. 5, 10.2012, p. 526-529.

Research output: Contribution to journalArticle

Hanioka, N, Nonaka, Y, Saito, K, Negishi, T, Okamoto, K, Kataoka, H & Narimatsu, S 2012, 'Effect of aflatoxin B1 on UDP-glucuronosyltransferase mRNA expression in HepG2 cells', Chemosphere, vol. 89, no. 5, pp. 526-529. https://doi.org/10.1016/j.chemosphere.2012.05.039
Hanioka, Nobumitsu ; Nonaka, Yuko ; Saito, Keita ; Negishi, Tomoe ; Okamoto, Keinosuke ; Kataoka, Hiroyuki ; Narimatsu, Shizuo. / Effect of aflatoxin B1 on UDP-glucuronosyltransferase mRNA expression in HepG2 cells. In: Chemosphere. 2012 ; Vol. 89, No. 5. pp. 526-529.
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