Elevated S-adenosylhomocysteine alters adipocyte functionality with corresponding changes in gene expression and...

Area of Science:

• Metabolic Health
• Epigenetics
• Nutritional Science

Background:

• Maternal micronutrient deficiencies during pregnancy impact offspring's metabolic health, including insulin resistance and obesity.
• Elevated S-adenosylhomocysteine (SAH) levels are observed in both mothers and offspring following vitamin deficiency.

Purpose of the Study:

• To investigate the direct effects of SAH, a key one-carbon metabolism intermediate, on adipocyte differentiation and function.
• To understand the epigenetic mechanisms underlying SAH's impact on adipocytes.

Main Methods:

• Murine 3T3-L1 preadipocytes were cultured with SAH to assess differentiation and function.
• Gene expression, DNA methylation, and histone modifications (H3K27 trimethylation) were analyzed.
• Glucose uptake and lipolysis were measured in treated and untreated adipocytes.

Main Results:

• SAH impaired glucose uptake and lipolysis in differentiated adipocytes.
• SAH reduced the expression of key adipogenic genes (Cebpα, Cebpβ, Rxrα) but did not affect Dlk1 or Pparγ2.
• SAH increased DNA methylation of Rxrα and H3K27 trimethylation on Cebpα and Rxrα promoters.

Conclusions:

• SAH alters adipocyte functionality, not adipogenesis itself, through epigenetic modifications.
• These epigenetic changes lead to impaired glucose disposal and lipolysis in adipocytes.
• Micronutrient imbalances can epigenetically modulate adipocyte function, influencing offspring metabolic health.