D-penicillamine-induced cleft palate in mice

Area of Science:

• Developmental toxicology
• Teratology
• Pharmacology

Background:

• D-penicillamine (DP) is a lathyrogen with known teratogenic potential.
• Cleft palate is a significant birth defect requiring understanding of its developmental etiology.
• The specific teratogenic mechanisms of DP, particularly concerning palate formation, warrant detailed investigation.

Purpose of the Study:

• To assess the teratogenic potential of D-penicillamine (DP) in mice, focusing on cleft palate induction.
• To investigate the influence of DP dosage and treatment duration on cleft palate development.
• To elucidate the underlying mechanisms of DP-induced cleft palate through histological analysis.

Main Methods:

• Pregnant mice were administered varying doses of D-penicillamine (DP) orally for 4 or 5 consecutive days during the critical period of palatal closure.
• Offspring were examined for external malformations, with a specific focus on the incidence and severity of cleft palate.
• Histological studies using light microscopy were performed on palatal shelves to analyze developmental changes.

Main Results:

• D-penicillamine (DP) induced cleft palate in offspring at doses that did not cause apparent maternal toxicity.
• The induction of cleft palate was found to be more sensitive to the duration of DP treatment than to the dosage.
• Histological examination revealed inhibitory effects on bone matrix formation and delayed elevation of palatal shelves in DP-exposed fetuses.
• No other external malformations were detected in the fetuses exposed to DP.

Conclusions:

• D-penicillamine (DP) is a potent teratogen capable of inducing cleft palate in mice, even at sub-toxic maternal doses.
• The duration of exposure to D-penicillamine (DP) is a critical factor in the induction of cleft palate.
• The mechanism of cleft palate induction by D-penicillamine (DP) involves delayed palatal shelf elevation, suggesting an osteolathyrogenic effect.