Prenatal triclosan exposure impairs mammalian lung branching morphogenesis through activating Bmp4 signaling

Area of Science:

• Toxicology
• Developmental Biology
• Environmental Health

Background:

• Triclosan (TCS) is a widespread antibacterial agent in consumer products.
• Concerns exist regarding prenatal Triclosan exposure and children's health.
• The impact of Triclosan on embryonic lung development is largely unknown.

Purpose of the Study:

• To investigate the toxicological effects of Triclosan on embryonic lung development.
• To elucidate the mechanisms underlying Triclosan-induced lung abnormalities.
• To assess the in vivo consequences of gestational Triclosan exposure on offspring lung structure.

Main Methods:

• Utilized an ex vivo lung explant culture system to model embryonic lung development.
• Administered Triclosan to pregnant dams to assess in vivo effects on offspring lungs.
• Analyzed lung branching morphogenesis, airway patterning, cell proliferation, and apoptosis.
• Investigated the role of Bone Morphogenetic Protein 4 (Bmp4) signaling pathway.

Main Results:

• Prenatal Triclosan exposure impaired lung branching and altered airway patterning in explants.
• Triclosan exposure led to reduced cell proliferation and increased apoptosis in developing lungs.
• Activated Bmp4 signaling was identified as a key mediator of Triclosan's toxicity.
• Partial rescue of lung defects was observed upon inhibition of Bmp4 signaling.
• In vivo studies confirmed compromised lung branching and enlarged airspaces in offspring exposed to Triclosan during gestation.

Conclusions:

• Gestational Triclosan exposure causes significant developmental toxicity to the embryonic lung.
• Triclosan-induced lung dysplasia is mediated, in part, by the Bmp4 signaling pathway.
• Findings suggest a potential association between maternal Triclosan exposure and lung abnormalities in offspring.