Lipid metabolism during the perinatal phase, and its implications on postnatal development

Area of Science:

• Perinatal nutrition and metabolism
• Developmental programming
• Endocrinology

Background:

• Lipid metabolism is crucial during pregnancy for fetal substrate supply.
• Perinatal nutritional insults can have lasting effects on offspring health.
• Understanding these effects is key to preventing metabolic disorders.

Purpose of the Study:

• To investigate the short- and long-term effects of altered maternal lipid metabolism during the perinatal stage on offspring.
• To determine the impact of maternal fat accumulation, undernutrition, and omega-3 fatty acid intake on offspring development and glucose homeostasis.
• To elucidate the mechanisms behind long-term metabolic consequences, differentiating between dietary composition and food intake effects.

Main Methods:

• Experimental designs in rats to manipulate maternal nutrition during specific perinatal periods (pregnancy, lactation).
• Assessment of intrauterine development, postnatal growth, body weight, and food intake.
• Evaluation of offspring glucose tolerance and glucose/insulin relationships at adult ages (10 and 16 weeks).
• Cross-fostering experiments to distinguish between prenatal and lactational effects.
• Investigation into the roles of decreased food intake versus altered milk composition.

Main Results:

• Impeded maternal fat accumulation in early pregnancy restricted intrauterine growth and impaired adult glucose tolerance.
• Undernutrition during suckling led to decreased body weight with lasting effects, despite normal post-weaning intake.
• A diet rich in omega-3 fatty acids during lactation, not pregnancy, negatively affected offspring glucose/insulin relationships.
• Reduced food intake during lactation, caused by the omega-3 rich diet, was responsible for altered pancreatic glucose responsiveness, not changes in milk fatty acid composition.

Conclusions:

• Maternal fat accumulation during early pregnancy is critical for normal intrauterine development and long-term metabolic health.
• Food intake during the lactation period significantly influences postnatal development and adult glucose/insulin regulation.
• The impact of maternal nutrition on offspring metabolic programming is complex, with factors like food availability playing a more dominant role than specific dietary components like omega-3 fatty acids.