Ethanol Consumption by Lactating Rats Induces Changes in Pup's Fatty Acid Profiles

Area of Science:

• Nutritional Neuroscience
• Developmental Toxicology
• Lactational Pharmacology

Background:

• Maternal ethanol consumption during lactation can impact offspring development.
• Understanding the specific effects of ethanol on milk composition and subsequent pup neurodevelopment is crucial.

Purpose of the Study:

• To investigate the effects of maternal ethanol intake on milk lipid composition and brain fatty acid profiles in lactating rats and their pups.
• To determine if observed effects are due to ethanol or associated undernutrition.

Main Methods:

• Lactating Wistar rats were divided into three groups: ethanol-fed (ET), pair-fed (PF), and control (C).
• Milk and pup brain tissues were collected on day 12 of lactation for fatty acid analysis.
• Pup body and brain weights were measured.

Main Results:

• Ethanol-fed dams exhibited altered milk fatty acid profiles, with decreased C14:0 and C22:6 n-3, and increased C18:0, C16:1, and C18:1 n-9 compared to controls.
• Pups from ethanol-fed dams showed lower body weight and evidence of essential fatty acid deficiency in brain phospholipids, indicated by an increased C20:3 n-9 to C20:4 n-6 ratio.
• Decreased levels of essential fatty acids, including docosahexaenoic acid (C22:6 n-3), were observed in the brain phospholipids of pups from ethanol-fed dams, effects not solely attributable to undernutrition.

Conclusions:

• Maternal ethanol intake during lactation significantly modifies milk lipid composition.
• Ethanol exposure during lactation leads to essential fatty acid deficiency in rat pups' brain phospholipids.
• These alterations in brain fatty acid composition may contribute to abnormal neurodevelopment in offspring exposed to ethanol in utero and during lactation.