Hepatic Transcriptomic Patterns in the Neonatal Rat After Pentabromodiphenyl Ether Exposure

Area of Science:

• Toxicology
• Environmental Health
• Genomics

Background:

• Human exposure to polybrominated diphenyl ethers (PBDEs) occurs in utero and during lactation.
• PBDEs are flame retardants with potential health risks.

Purpose of the Study:

• To investigate if neonatal hepatic transcriptomic alterations from PBDE exposure predict longer-term toxicity and carcinogenicity.
• To assess the utility of early toxicogenomic indicators for risk evaluation.

Main Methods:

• Wistar Han rat dams were exposed to DE-71 or PBDE-47 from gestation day 6 to postnatal day 4.
• Hepatic gene expression and plasma thyroxine (T4) levels were analyzed in pups.

Main Results:

• Decreased plasma T4 levels were observed in exposed pups.
• Upregulation of transcripts for CYPs, conjugation enzymes, Nrf2, and ABC transporters in the liver.
• Transcriptomic alterations indicated early signs of oxidative stress and metabolic changes.

Conclusions:

• Neonatal PBDE exposure induces hepatic transcriptomic changes that serve as early indicators of potential toxicity and carcinogenicity.
• PBDE-47 showed a lower transcriptional benchmark dose than the PBDE mixture.
• Toxicogenomic data can help prioritize chemicals for further risk assessment.