β-naphthoflavone represses dystrophin Dp71 expression in Hepa-1 cells

Mario Bermúdez de León, Pablo Gómez, Guillermo Elizondo, Rocío Zatarain-Palacios, Francisco García-Sierra, Bulmaro Cisneros

Research output: Contribution to journalArticlepeer-review

6 Citations (Scopus)

Abstract

Dystrophin Dp71 is expressed in hepatic tissue; however, its function in this tissue remains unknown. The Dp71 promoter sequence contains conserved CACGC motifs, which constitute the invariant core sequence of xenobiotic-regulatory elements. These elements function as target sites for the aryl hydrocarbon receptor/aryl hydrocarbon nuclear translocator (Ahr/ARNT) in genes regulated by this transcription factor. Thus, Dp71 expression in hepatic cells would be regulated by Ahr signaling. In this study, the effect of the xenobiotics β-Naphthoflavone (βNF), 2,3,7,8-tetrachlorodibenzo-p-dioxin (TCDD) and Benzo[a]Pyrene (BaP) on Dp71 expression was analyzed in Hepa-1 cells. It was demonstrated that βNF, but not BaP or TCDD, represses Dp71 expression at both transcriptional and translational levels. To test directly the involvement of the Ahr signaling in the negative regulation of Dp71, we analyzed the effect of βNF on Dp71 expression in the liver of wild type (Ahr+/+) and AHR-null (Ahr-/-) mice. The Dp71 mRNA repression, caused by the βNF treatment, was also found in the liver tissue of wild type mice; however, such negative effect was reversed in the liver of AHR-null mice, which supports the participation of the Ahr signaling in Dp71 downregulation. Modulation of Dp71 expression by βNF may represent a novel mechanism of Ahr action.

Original languageEnglish
Pages (from-to)152-158
Number of pages7
JournalBiochimica et Biophysica Acta - Gene Structure and Expression
Volume1759
Issue number3-4
DOIs
Publication statusPublished - 1 Mar 2006
Externally publishedYes

Bibliographical note

Funding Information:
This study was supported by Consejo Nacional de Ciencia y Tecnología, Grant No. 43285. The authors thank Victor Tapia Ramírez for cell culturing and Ma. Lourdes López González for mice genotyping. We are in debt with Dr. Derek J. Blake for providing anti-dystrophin antibody 2166.

Copyright:
Copyright 2008 Elsevier B.V., All rights reserved.

All Science Journal Classification (ASJC) codes

  • Structural Biology
  • Biophysics
  • Biochemistry
  • Genetics

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