Cocaine-induced embryonic cardiovascular disruption in mice

Area of Science:

• Developmental toxicology
• Teratology
• Embryology

Background:

• Cocaine use during pregnancy is a significant public health concern.
• Cocaine's teratogenic potential, particularly its effects on cardiovascular development, requires further investigation.

Purpose of the Study:

• To investigate whether vascular disruption is a key feature of cocaine-induced teratogenicity in early murine organogenesis.
• To assess the embryotoxic effects of cocaine using in vivo, in vitro, and in vivo-in vitro experimental models.

Main Methods:

• Murine embryos were exposed to cocaine via in vivo administration, in vitro culture, or a combination of both.
• Embryos were assessed for vascular perturbations (vasodilation, hemorrhage, yolk sac vasculature development) and neural defects.
• Cardiovascular function (heartbeat, circulation) was evaluated in the in vivo-in vitro model.

Main Results:

• In vivo and in vivo-in vitro cocaine exposure led to significant vascular disruption, including vasodilation, hemorrhage, and inhibited yolk sac vasculature development.
• In vitro exposure showed inhibited yolk sac vasculature at higher concentrations but no hemorrhage.
• Both in vivo and in vitro exposure increased neural tube defects; cardiovascular effects were primarily observed in the in vivo and in vivo-in vitro models, suggesting a maternally mediated mechanism.

Conclusions:

• Cocaine exposure in vivo or in vivo-in vitro causes significant cardiovascular and neural defects in developing murine embryos.
• The absence of hemorrhage in vitro suggests that cocaine's cardiovascular toxicity may be mediated by maternal factors.
• These findings highlight the critical impact of maternal cocaine exposure on embryonic development, particularly cardiovascular system formation.