Glucose-dependent inflammatory responses in obese compared to lean individuals

Area of Science:

• Endocrinology
• Immunology
• Metabolic Syndrome

Background:

• Obesity is associated with chronic inflammation, a potential driver of insulin resistance and type 2 diabetes.
• Understanding inflammatory responses to glucose and insulin fluctuations is crucial for metabolic health.

Purpose of the Study:

• To investigate alterations in inflammatory marker responses to glycemic and insulinemic variations in obese individuals.
• To compare inflammatory profiles during hyperinsulinemia, hypoglycemia, and hyperglycemia between obese and lean subjects.

Main Methods:

• Analysis of 92 inflammatory markers in plasma samples from obese and lean individuals using Proximity Extension Assay.
• Utilized hyperinsulinemic-euglycemic-hypoglycemic and hyperglycemic clamp techniques to induce specific metabolic states.
• Collected samples at fasting, during hyperinsulinemia-euglycemia, hypoglycemia, and hyperglycemia.

Main Results:

• Hyperinsulinemia, hypoglycemia, and hyperglycemia generally suppressed inflammatory markers, with more pronounced suppression observed in obese individuals.
• Specific inflammatory markers like FGF-21, IL-6, and IL-10 showed distinct changes during different glycemic/insulinemic conditions.
• Correlations were found between Body Mass Index (BMI), HbA1c, M-value, and the changes in various inflammatory markers.

Conclusions:

• Acute variations in glucose and insulin levels lead to a suppression of inflammatory markers, particularly in individuals with obesity and insulin resistance.
• These findings suggest that acute glycemic or insulinemic challenges may not directly exacerbate inflammatory pathways contributing to insulin resistance and dysglycemia.