Maternally-mediated developmental lithium toxicity in the mouse

Area of Science:

• Toxicology
• Developmental Biology
• Pharmacology

Background:

• Lithium salts are widely used therapeutically but can cross the placenta.
• Maternal medication use during pregnancy and lactation necessitates understanding potential offspring toxicity.

Purpose of the Study:

• To investigate maternally-mediated developmental toxicity of lithium chloride (LiCl) in mice offspring.
• To determine the influence of offspring gender and maternal LiCl intake duration on toxicity.

Main Methods:

• Mice dams were administered LiCl (1 mEq) from preconception through weaning.
• Offspring were assessed for organ weight changes and specific enzyme activities (hepatic alcohol dehydrogenase, heart lactate dehydrogenase, liver aldehyde dehydrogenase).

Main Results:

• Female offspring exhibited greater sensitivity to organ weight changes compared to males.
• Maternal LiCl intake induced hepatic alcohol dehydrogenase and heart lactate dehydrogenase in both sexes.
• Liver aldehyde dehydrogenase induction occurred only following postnatal LiCl exposure.

Conclusions:

• Maternal exposure to lithium salts during gestation and lactation can lead to developmental toxicity in offspring.
• Breastfeeding plays a role in the transmission of LiCl-induced developmental effects.
• Gender-specific sensitivities and enzyme alterations highlight the complex impact of in utero and lactational LiCl exposure.