Senolytic Changes in Murine Arteriovenous Fistulas with CKD

Area of Science:

• Vascular Biology
• Nephrology
• Senescence Research

Background:

• Arteriovenous fistulas (AVFs) are crucial for hemodialysis but frequently fail within a year.
• Mechanisms of AVF failure are unclear, and current treatments are insufficient.
• Cellular senescence, potentially accelerated by end-stage kidney disease (ESKD), may play a role in AVF dysfunction.

Purpose of the Study:

• To characterize the temporal and spatial features of AVF changes in uremic mice.
• To investigate the progression of vascular senescence in AVFs under uremic conditions.

Main Methods:

• Mice underwent 5/6 nephrectomy to induce uremia.
• AVFs were surgically created 28 days later.
• Transcriptomic and histological analyses were performed at 7, 14, and 28 days post-AVF creation.

Main Results:

• Transcriptomic analysis revealed significant enrichment of senescence-related genes in AVF outflow veins.
• Histological assessment showed an increase in senescence markers (p16, p21, phospho53) between days 14 and 28.
• Gene expression patterns supported known AVF failure markers and identified potential novel modulators.

Conclusions:

• This study provides the first chronological characterization of vascular senescence in the AVF of uremic mice.
• Findings suggest cellular senescence is a key factor in AVF failure.
• Identifying novel modulators may lead to senolytic strategies to enhance AVF patency.