Low-dose trichloroethylene alters cytochrome P450-2C subfamily expression in the developing chick heart

Om Makwana, Lauren Ahles, Alejandro Lencinas, Ornella Selmin, Raymond B Runyan

Research output: Contribution to journalArticle

10 Citations (Scopus)

Abstract

Trichloroethylene (TCE) is an organic solvent and common environmental contaminant. TCE exposure is associated with heart defects in humans and animal models. Primary metabolism of TCE in adult rodent models is by specific hepatic cytochrome P450 enzymes (Lash et al. in Environ Health Perspect 108:177-200, 2000). As association of TCE exposure with cardiac defects is in exposed embryos prior to normal liver development, we investigated metabolism of TCE in the early embryo. Developing chick embryos were dosed in ovo with environmentally relevant doses of TCE (8 and 800 ppb) and RNA was extracted from cardiac and extra-cardiac tissue (whole embryo without heart). Real-time PCR showed upregulation of CYP2H1 transcripts in response to TCE exposure in the heart. No detectable cytochrome expression was found in extra-cardiac tissue. As seen previously, the dose response was non-monotonic and 8 ppb elicited stronger upregulation than 800 ppb. Immunostaining for CYP2C subfamily expression confirmed protein expression and showed localization in both myocardium and endothelium. TCE exposure increased protein expression in both tissues. These data demonstrate that the earliest embryonic expression of phase I detoxification enzymes is in the developing heart. Expression of these CYPs is likely to be relevant to the susceptibility of the developing heart to environmental teratogens.

Original languageEnglish (US)
Pages (from-to)77-84
Number of pages8
JournalCardiovascular Toxicology
Volume13
Issue number1
DOIs
StatePublished - Mar 2013

Fingerprint

Trichloroethylene
Cytochrome P-450 Enzyme System
Embryonic Structures
Tissue
Metabolism
Phase I Metabolic Detoxication
Up-Regulation
Teratogens
Detoxification
Defects
Liver
Chick Embryo
Cytochromes
Organic solvents
Endothelium
Real-Time Polymerase Chain Reaction
Rodentia
Myocardium
Animals
Proteins

Keywords

  • Congenital heart defects
  • CYP1A4
  • CYP2C45
  • CYP2H1
  • TCE
  • Xenobiotic metabolism

ASJC Scopus subject areas

  • Toxicology
  • Cardiology and Cardiovascular Medicine
  • Molecular Biology

Cite this

Low-dose trichloroethylene alters cytochrome P450-2C subfamily expression in the developing chick heart. / Makwana, Om; Ahles, Lauren; Lencinas, Alejandro; Selmin, Ornella; Runyan, Raymond B.

In: Cardiovascular Toxicology, Vol. 13, No. 1, 03.2013, p. 77-84.

Research output: Contribution to journalArticle

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