Kupffer cell programming by maternal obesity triggers fatty liver disease

Area of Science:

• Immunology
• Developmental Biology
• Metabolic Disease

Background:

• Kupffer cells (KCs) are crucial liver-resident macrophages involved in homeostasis.
• Developmental programming of KCs and its link to postnatal diseases remain unclear.

Purpose of the Study:

• Investigate if maternal obesity during gestation perturbs KC development, leading to adult fatty liver disease.
• Determine the mechanisms by which programmed KCs contribute to liver pathology.

Main Methods:

• Utilized a mouse model of maternal obesity to study offspring KC development.
• Employed KC depletion and replenishment strategies in neonate mice.
• Investigated the role of hypoxia-inducible factor-α (HIF1α) in macrophage programming.

Main Results:

• Offspring of obese mothers exhibited persistent fatty liver disease due to aberrant KC programming.
• Programmed KCs promoted hepatocyte lipid uptake via apolipoprotein secretion.
• Neonatal KC restoration or HIF1α ablation in macrophages prevented fatty liver disease.

Conclusions:

• Developmental perturbation of KC function is a causal factor in adult fatty liver disease.
• Fetal-derived macrophages act as intergenerational messengers in the context of developmental origins of health and disease.