Endothelial AGGF1 Deficiency Causes Mitochondrial Dysfunction and Contributes to Age-Elevated Blood Pressure

Area of Science:

• Cardiovascular Biology
• Molecular Medicine
• Aging Research

Background:

• Endothelial cells play a key role in blood pressure regulation.
• AGGF1 (Angiogenic Factor with G Patch Domain 1) is essential for endothelial cell function.
• The role of AGGF1 in blood pressure regulation and vascular aging requires further investigation.

Purpose of the Study:

• To investigate the role of AGGF1 in regulating blood pressure and vascular aging.
• To elucidate the molecular mechanisms by which AGGF1 influences endothelial function and blood pressure.

Main Methods:

• Utilized endothelial-specific Aggf1 knockout and human AGGF1 transgenic mouse models.
• Assessed blood pressure, vascular function (arterial stiffness, vasorelaxation), oxidative stress, and endothelial nitric oxide synthase (eNOS) phosphorylation.
• Investigated the interaction of AGGF1 with the SESN2 promoter and its effect on mitochondrial function.

Main Results:

• Endothelial AGGF1 deficiency increased blood pressure and accelerated vascular aging in male mice.
• AGGF1 overexpression suppressed age-related blood pressure elevation and rescued vascular aging phenotypes.
• AGGF1 enhances SESN2 transcription, which attenuates mitochondrial dysfunction and improves endothelial function via p-eNOS.
• The AGGF1/SESN2/p-eNOS signaling pathway is crucial for maintaining blood pressure and vascular health.

Conclusions:

• Endothelial AGGF1 is a critical regulator of blood pressure and vascular aging.
• The AGGF1/SESN2/p-eNOS axis represents a novel signaling pathway for blood pressure maintenance.
• Age-related suppression of this pathway contributes to elevated blood pressure in male mice.
• AGGF1 is a potential therapeutic target for age-related hypertension, particularly in elderly males.