Elevated GlycA in severe obesity is normalized by bariatric surgery

Area of Science:

• Biochemistry
• Metabolic Health
• Inflammation Research

Background:

• Chronic inflammation is a key driver of obesity-related diseases like atherosclerosis.
• GlycA is a systemic inflammation marker with lower variability than hs-CRP, linked to cardiovascular events and mortality.
• While GlycA is elevated in obesity, its relationship with anthropometric measures is modest, and the impact of weight loss remains unstudied.

Purpose of the Study:

• To investigate the effect of bariatric surgery-induced weight loss on GlycA levels in obese women.
• To compare GlycA reduction between Roux-en-Y gastric bypass and sleeve gastrectomy.
• To explore the association between changes in GlycA and anthropometric measures, including high-density lipoprotein particle size.

Main Methods:

• Prospective study of obese, non-diabetic women undergoing bariatric surgery (Roux-en-Y or sleeve gastrectomy) or controls with normal BMI.
• Measurements of GlycA and anthropometric parameters at baseline, 6 months, and 12 months post-surgery.
• Statistical analysis to assess changes in GlycA, differences between procedures, and correlations with other measures.

Main Results:

• Bariatric surgery led to significant GlycA reduction by 6 months (451 to 383 micromol/L) and further reduction by 12 months (348 micromol/L; P < 0.001).
• No significant difference in GlycA reduction was observed between gastric bypass and sleeve gastrectomy.
• At 12 months, GlycA levels in surgical patients did not differ from controls, despite many retaining a BMI >30 kg/m².
• Increased high-density lipoprotein particle size strongly correlated with reduced GlycA (r = -0.49; P < 0.001) and mediated 43% of the weight-loss-associated fall.

Conclusions:

• Surgical weight loss markedly reduces GlycA levels, demonstrating a significant impact on systemic inflammation.
• The reduction in GlycA is substantial and occurs relatively quickly post-surgery.
• Improvements in high-density lipoprotein particle size play a crucial role in mediating the beneficial effects of weight loss on GlycA.