Nagoya University Researchers Identify Blood Aging Link to Aortic Aneurysms and Potential Drug Repurposing Solution

Nagoya University study finds that age-related blood mutations drive aortic aneurysms and that existing bone drugs could provide a non-surgical treatment.

By: AXL Media

Published: Apr 14, 2026, 7:51 AM EDT

Source: Information for this report was sourced from EurekAlert

The Search for Non-Surgical Interventions

Aortic aneurysms involve a dangerous enlargement of the body's primary artery, often resulting in fatal ruptures if left untreated. Currently, medical professionals rely exclusively on surgical procedures to address the condition once the risk of rupture becomes too high. However, researchers at Nagoya University in Japan have uncovered a biological mechanism that explains why some aneurysms expand more rapidly than others. Published in the Journal of Clinical Investigation, their findings point toward a breakthrough in pharmaceutical treatment that could potentially eliminate the need for high-risk surgery in many patients.

Clonal Hematopoiesis as a Biological Marker

The research team, led by Assistant Professor Yoshimitsu Yura, focused on clonal hematopoiesis, an age-related process where blood-forming stem cells develop genetic mutations. In a clinical study of 44 surgical candidates, the team discovered that approximately 60% of the patients possessed these mutations. Critically, these individuals experienced a significantly faster rate of aneurysm expansion compared to those with "younger" blood. This discovery suggests that routine blood sampling for clonal hematopoiesis could serve as a vital new biological marker for predicting disease severity and progression.

The Macrophage Transformation Mechanism

To understand why mutated blood cells accelerate arterial damage, the researchers utilized a mouse model featuring Tet2 mutations. They observed that macrophages derived from these mutated cells infiltrated the aortic wall and underwent a cellular transformation. These macrophages began to behave like osteoclasts, which are cells normally responsible for breaking down bone tissue. This transformation led to the fragmentation of elastin fibers and the degradation of the vascular smooth muscle cells within the aorta. According to graduate student Jun Yonekawa, this cellular shift is a primary driver of the structural weakening seen in progressive aneurysms.