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Very early effect of DMBA and MNU on microRNA expression

Krisztina Juhász1, Katalin Gombos, Mónika Szirmai

  • 1Institute of Public Health, Faculty of Medicine, University of Pécs, Pécs, 12 Szigeti str., 7624 Hungary. krisztina.juhasz01@gmail.com

In Vivo (Athens, Greece)
|December 15, 2012
PubMed
Abstract

Insights

Early changes in microRNA (miRNA) expression were observed in mice exposed to carcinogens. These findings highlight miRNAs as potential biomarkers for detecting environmental carcinogenesis in its initial stages.

Area of Science:

  • Environmental toxicology
  • Molecular biology
  • Cancer research

Background:

  • MicroRNA (miRNA) expression profiling aids in evaluating early carcinogenesis.
  • This study investigates early miRNA expression alterations following exposure to distinct carcinogens.

Purpose of the Study:

  • To analyze the impact of specific carcinogens on miRNA expression patterns.
  • To identify potential miRNA biomarkers for early environmental tumorigenesis.

Main Methods:

  • Mice received single intraperitoneal injections of 7,12-dimethylbenz(α)anthracene (DMBA) or N-methyl-N-nitrosourea (MNU).
  • miRNA expression was quantified using quantitative real-time-polymerase chain reaction (qRT-PCR) at 3 and 6 hours post-treatment.

Main Results:

  • MNU treatment led to underexpression of miR-34a and miR-155 in the liver, spleen, and kidneys.
  • DMBA treatment elevated miR-21 expression in lungs and kidneys 6 hours post-exposure.
  • MNU induced higher miR-21 expression in the liver at 3 and 6 hours compared to DMBA.

Conclusions:

  • Distinct miRNA responses to different carcinogens were observed.
  • These findings support the role of miRNAs as potential epidemiological biomarkers for early environmental carcinogenesis.

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