Morphological and inflammatory changes in visceral adipose tissue during obesity

Area of Science:

• Metabolic disease
• Immunology
• Obesity research

Background:

• Obesity is a global health issue linked to insulin resistance and type II diabetes.
• Chronic nutrient excess causes visceral adipose tissue (VAT) expansion and dysfunction.
• VAT dysfunction involves adipocytes, their matrix, and immune cell infiltration, leading to hypoxia, stress, and cell death.

Purpose of the Study:

• To review recent findings on changes in visceral adipose tissue during obesity.
• To highlight the link between VAT alterations, chronic inflammation, and metabolic disease.

Main Methods:

• Review of recent scientific literature on obesity and visceral adipose tissue.
• Analysis of histological hallmarks like crown-like structures in VAT.
• Examination of immune cell crosstalk and inflammatory mediator production in VAT.

Main Results:

• Obesity leads to VAT expansion, hypoxia, and adipocyte cell death.
• Immune cell infiltration around dying adipocytes forms crown-like structures, a hallmark of obese VAT.
• Immune cell interactions in VAT drive inflammation and insulin resistance.

Conclusions:

• Visceral adipose tissue undergoes significant changes in obesity, characterized by inflammation.
• These VAT changes are critical drivers of low-grade chronic inflammation and associated metabolic diseases.
• Understanding VAT's role is key to addressing obesity-related metabolic complications.