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Obesity triggers chronic inflammation by activating vascular endothelium, initiating leukocyte infiltration into adipose tissue before significant weight gain. This microvascular dysfunction precedes and drives adipose tissue inflammation in obesity.

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Area of Science:

  • Endocrinology
  • Immunology
  • Cardiovascular Biology

Background:

  • Obesity is linked to chronic low-grade inflammation in tissues like adipose tissue.
  • Leukocyte infiltration into adipose tissue is a key component of obesity-related inflammation.
  • Microvascular dysfunction is observed in obesity, but its role in inflammation is debated.

Purpose of the Study:

  • To propose that microvascular dysfunction, not adipose tissue dysfunction, initiates inflammation in obesity.
  • To present evidence that vascular endothelium activation precedes adipose tissue inflammation.
  • To explore how microvascular heterogeneity influences inflammatory phenotypes in different fat depots.

Main Methods:

  • Review of key published data on obesity, inflammation, and microcirculation.
  • Analysis of the role of vascular endothelium in leukocyte extravasation.
  • Discussion of anatomical and physiological differences in microcirculation.

Main Results:

  • Nutrient overload acutely activates inflammatory pathways in the vascular endothelium.
  • This activation initiates leukocyte infiltration into visceral adipose tissue.
  • Microvascular dysfunction may precede and cause adipose tissue inflammation, rather than being a consequence.

Conclusions:

  • The vascular endothelium acts as an early initiator of adipose tissue inflammation in obesity.
  • Microvascular dysfunction is a potential primary driver of obesity-related inflammation.
  • Understanding microvascular heterogeneity is crucial for explaining differential fat depot inflammation.