Cigarette smoke induced neural tube defects by down-regulating noggin expression

Area of Science:

• Developmental biology
• Toxicology
• Teratology

Background:

• Maternal smoking is a known risk factor for congenital birth defects, including neural tube defects (NTDs).
• The precise mechanisms by which cigarette smoke induces NTDs remain largely unknown.
• Cigarette smoke acts as a teratogen, interfering with embryonic development.

Purpose of the Study:

• To investigate the effects of passive smoking on neural tube development in a golden hamster model.
• To elucidate the molecular mechanisms underlying cigarette smoke-induced NTDs, focusing on noggin and BMP2 expression.

Main Methods:

• Utilized a golden hamster model of passive smoking during gestation.
• Employed scanning electron microscopy to observe neural tube development.
• Assessed noggin expression in placental and neural tube tissues via immunohistochemistry.
• Analyzed human placental gene expression data from public databases (Human Protein Atlas, GEO).

Main Results:

• Passive smoking exposure delayed or prevented neural tube closure in golden hamster embryos.
• Cigarette smoke exposure downregulated noggin expression and increased BMP2 expression in the embryo.
• In human placental tissues, noggin expression decreased with advancing gestation.
• Cigarette smoke promoted placental cell apoptosis and accelerated placental maturation.

Conclusions:

• Cigarette smoke exposure can lead to NTDs by downregulating noggin and dis-inhibiting BMP2.
• The teratogenic effects of smoking may involve accelerated placental maturation and increased apoptosis.
• Findings highlight the critical role of noggin in preventing NTDs during gestation.