Postprandial cell defense system responses to meal formulations: stratification through gene expression profiling

Area of Science:

• Human physiology
• Nutritional science
• Molecular biology

Background:

• Cellular defense mechanisms are crucial for maintaining homeostasis during postprandial stress.
• Individual responses to dietary intake vary significantly based on genetics, health status, and food composition.

Purpose of the Study:

• To investigate how food composition impacts individual postprandial metabolic and cellular responses.
• To explore the association between these responses and an individual's health status.

Main Methods:

• Sixteen volunteers consumed four different food formulations varying in fat type (unsaturated/saturated) and beetroot extract content.
• Whole blood gene expression of 28 cell defense markers was analyzed using GeXP assay at multiple postprandial time points.
• Plasma markers including lipids, hormones, inflammatory cytokines, and DNA damage/repair indicators were assessed.

Main Results:

• Distinct subgroups of gene expression profiles were identified, correlating with plasma high-density lipoproteins (HDLs) and tumor necrosis factor-alpha (TNF-α).
• Specific genes like SOCS3 and PPIA showed stratified postprandial responses.
• Leptin, interleukin-6 (IL6), and DNA strand breaks differed based on the type of fat consumed.

Conclusions:

• Postprandial immune, inflammatory, redox, metabolic, and DNA repair responses were largely unaffected by fat saturation or beetroot extract in healthy individuals.
• Gene expression regulation during postprandial states is linked to health status markers.
• Significant interindividual variation exists in postprandial responses, influencing overall health outcomes.