Paracrine regulation of vascular tone, inflammation and insulin sensitivity by perivascular adipose tissue

Area of Science:

• Cardiovascular Biology
• Metabolic Disease Research
• Adipose Tissue Biology

Background:

• Perivascular adipose tissue (PVAT) surrounds small arteries and arterioles.
• PVAT plays a paracrine role in regulating vascular tone.
• PVAT undergoes significant changes in obesity and diabetes, including inflammation and altered adipokine production.

Purpose of the Study:

• To review the role of PVAT in vascular (dys)function, particularly in obesity and type 2 diabetes.
• To examine how PVAT-derived factors influence insulin-mediated vasoregulation.
• To explore the impact of PVAT expansion and inflammation on vascular signaling pathways.

Main Methods:

• Review of existing literature on PVAT.
• Analysis of signaling pathways involved in insulin-mediated vasoregulation.
• Examination of the influence of adipokines and inflammatory mediators from PVAT.

Main Results:

• Expanded PVAT in obesity and diabetes involves enlarged fat cells, inflammatory cell accumulation, and altered adipokine/cytokine profiles.
• PVAT-derived factors modulate insulin-mediated vasoregulation in mouse resistance arteries.
• Adiponectin, TNFα, and free fatty acids from PVAT influence vascular function via specific signaling pathways (AMPK, JNK, PKC-θ).

Conclusions:

• PVAT is a critical regulator of vascular function, especially in metabolic diseases.
• Altered PVAT in obesity and diabetes contributes to vascular dysfunction and may influence hypertension.
• Further research is needed to establish a causal role for PVAT in hypertension.