The BPV-4 co-carcinogen quercetin induces cell cycle arrest and up-regulates transcription from the LCR of BPV-4

Oncogene
J A ConnollyM S Campo

Abstract

Bracken fern is the environmental co-carcinogen of BPV-4 in the induction of neoplasias of the upper alimentary canal of cattle. The flavonoid quercetin is one of the most potent and best characterised mutagens present in the fern. We have shown that transfection with BPV-4 DNA and exposure to a single dose of quercetin leads to tumorigenic transformation of primary bovine cells. We now show that quercetin induces cell cycle arrest and up-regulates transcription from the BPV-4 long control region (LCR). This up-regulation is mediated by a 21 nucleotide-long cis-element in the LCR, designated QRE-1, which is located immediately downstream of the TATA box. Cellular proteins bind to QRE-1 and removal or substitution of QRE-1 lead to the abrogation of the response to quercetin. As expression of the viral oncogenes is controlled by the LCR, perturbation in this control and increased oncoprotein expression are likely to contribute to fully malignant cell transformation by overcoming the cell cycle arrest induced by quercetin, thus forcing damaged cells to proliferate.

Citations

Nov 26, 2002·Virus Research·M Saveria Campo
Jul 23, 1999·Mutation Research·M ShahinA S Prakash
Jan 10, 2012·Journal of Hazardous Materials·R M Gil da CostaC Lopes
Oct 13, 2009·Journal of Comparative Pathology·S RopertoF Roperto
Oct 18, 2008·Veterinary Dermatology·Lubna Nasir, M Saveria Campo
Jul 2, 2014·Veterinary Pathology·J S Munday
Jun 16, 2001·Carcinogenesis·R G BenistonM S Campo
Sep 17, 1999·The Journal of Biological Chemistry·K W VanceI M Morgan
Mar 1, 2003·Veterinary and Comparative Oncology·M S Campo

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