Reactive oxygen species contribute to lipopolysaccharide-induced teratogenesis in mice

Area of Science:

• Developmental toxicology
• Reproductive toxicology
• Biochemistry

Background:

• Lipopolysaccharide (LPS) is known to cause adverse developmental outcomes, including fetal death and growth retardation.
• Previous studies suggest a link between LPS exposure and negative impacts on pregnancy.
• Understanding the mechanisms behind LPS-induced developmental toxicity is crucial for maternal and fetal health.

Purpose of the Study:

• To investigate the teratogenic effects of lipopolysaccharide (LPS) in a rodent model.
• To explore the role of oxidative stress in LPS-induced developmental abnormalities.
• To evaluate the protective potential of the antioxidant alpha-Phenyl-N-t-butylnitrone (PBN) against LPS teratogenicity.

Main Methods:

• Pregnant dams were administered varying doses of LPS daily between gestational days 8 and 12.
• External fetal malformations were assessed.
• Biomarkers of oxidative stress, including lipid peroxidation and nitrotyrosine residues, were measured in maternal liver, embryo, and placenta.
• The effect of alpha-Phenyl-N-t-butylnitrone (PBN), a free radical scavenger, on LPS-induced effects was examined.

Main Results:

• LPS exposure led to a significant incidence of external malformations in fetuses, dose-dependently.
• Even short-term LPS exposure (two doses) on gestational day 8 resulted in substantial malformations.
• LPS-induced teratogenicity was associated with increased oxidative stress markers and glutathione depletion.
• PBN administration mitigated LPS-induced oxidative stress and reduced the occurrence of fetal malformations.

Conclusions:

• Reactive oxygen species are implicated, at least partially, in lipopolysaccharide-induced teratogenesis.
• Antioxidant interventions may offer a protective strategy against LPS-driven developmental toxicity.
• This study highlights the critical role of oxidative balance during early pregnancy.