Aspirin-induced teratogenesis: a unique pattern of cell death and subsequent polydactyly in the rat

Area of Science:

• Developmental biology
• Teratology
• Molecular embryology

Background:

• Limb development involves precise cell signaling and programmed cell death.
• Polydactyly, an extra digit, can arise from disruptions in limb morphogenesis.
• Aspirin is a known teratogen, but its specific effects on limb development require further elucidation.

Purpose of the Study:

• To investigate the effects of high-dose aspirin on embryonic hindlimb development.
• To identify the cellular mechanisms underlying aspirin-induced polydactyly in rat offspring.
• To explore the role of programmed cell death in the pathogenesis of aspirin-induced limb malformations.

Main Methods:

• Pregnant rats were administered a high dose of aspirin on day 11 of gestation.
• Embryos were collected on day 12 for detailed morphological examination of hindlimb buds.
• Histological analysis focused on patterns of cell death in the mesoderm and ectoderm of developing limbs.

Main Results:

• Aspirin-treated offspring frequently exhibited hindlimb polydactyly, primarily on the right side.
• Embryonic hindlimb buds showed a unique pattern of preaxial mesodermal cell death.
• A delay in apical ectodermal ridge cell death and absence of necrosis in the preaxial mesoderm were observed.

Conclusions:

• High-dose aspirin exposure during gestation can induce polydactyly through disruption of normal cell death processes.
• Altered programmed cell death in the limb bud mesoderm and ectoderm is a key mechanism in aspirin-induced polydactyly.
• These findings highlight the critical role of precise spatiotemporal regulation of cell death in normal limb formation and the teratogenic potential of aspirin.