CTRP13-Mediated Effects on Endothelial Cell Function and Their Potential Role in Obesity

Area of Science:

• Cardiovascular Biology
• Endocrinology
• Metabolic Syndrome

Background:

• Obesity and cardiometabolic syndrome disrupt the balance of pro- and anti-atherosclerotic factors.
• Adipocytokines, including C1q/TNF-related proteins (CTRPs), influence atherosclerosis development.
• CTRPs are implicated in modulating atherosclerosis, prompting investigation into CTRP13's vascular role.

Purpose of the Study:

• To investigate the vascular effects of CTRP13.
• To determine CTRP13 expression patterns in obesity and diabetic conditions.
• To elucidate the mechanisms by which CTRP13 influences endothelial cell function.

Main Methods:

• Assessed CTRP13 expression in vessels and endothelial cells (ECs) from obese and lean mice, rats, and humans.
• Utilized Human Umbilical Vein Endothelial Cells (HUVECs) cultured with serum from obese mice, high glucose, and TNF-alpha.
• Administered recombinant CTRP13 and employed adenoviral vectors for dominant-negative (DN) and wild-type (WT) alpha 1/alpha 2 AMP-activated protein kinase (AMPK) manipulation.

Main Results:

• CTRP13 is expressed in vascular ECs and its expression is elevated in obese individuals.
• High glucose and TNF-alpha increased CTRP13 expression in HUVECs.
• CTRP13 reduced EC proliferation, cell cycle progression, and modulated p53, p21, and Rb phosphorylation, largely via alpha-2 AMPK.

Conclusions:

• CTRP13 expression is upregulated in ECs under diabetic conditions.
• CTRP13 exhibits significant vaso-modulatory properties.
• CTRP13 may influence vascular disease progression in patients with metabolic disorders.