Maternal high-fat diet prevents developmental programming by early-life stress.

Area of Science:

• Neuroscience
• Developmental Biology
• Maternal Health

Background:

• Adverse childhood events are linked to anxiety and depression.
• Maternal obesity and high-fat diets (HFD) are emerging risk factors for offspring mental health.
• The combined impact of maternal HFD and maternal separation (MS) on offspring development requires further investigation.

Purpose of the Study:

• To investigate the combinatorial effects of maternal HFD and MS on offspring brain development and behavior in a rat model.
• To determine if maternal HFD can mitigate the negative impacts of MS on offspring mental health and neurodevelopment.

Main Methods:

• Rats were exposed to a maternal HFD (40% fat) during gestation and lactation, with or without maternal separation (MS).
• Gene expression in the prefrontal cortex (PFC) of pups was analyzed.
• Offspring were assessed for adult endophenotypes including anxiety, spatial memory, social behavior, HPA axis response, hippocampal neurogenesis, and visceral pain.

Main Results:

• MS altered gene expression (Bdnf, 5HT-r1a, Rest4) in the offspring's PFC.
• Perinatal maternal HFD significantly attenuated MS-induced developmental alterations.
• Maternal HFD completely prevented MS-associated adult endophenotypes, including anxiety and HPA axis dysregulation.
• Maternal HFD reduced anxiety and improved maternal care in dams.

Conclusions:

• Maternal HFD during gestation and lactation, even without causing maternal weight gain, can protect offspring from the neurodevelopmental and behavioral consequences of maternal separation.
• These findings highlight the critical role of maternal metabolic state, specifically obesity, rather than fat intake alone, in shaping offspring brain vulnerability.
• The study suggests a potential protective strategy against early-life stress-induced mental health issues through maternal dietary interventions.