New Markers May Help Detect Early Heart Changes in People with Type 1 Diabetes

Heart problems are one of the most serious long-term complications of Type 1 diabetes. The challenge is that early damage often happens silently, without symptoms, making it hard for doctors to know when to step in. Researchers are searching for biological markers—signs in the blood or tissue—that could reveal heart stress before a person feels anything wrong.

When blood sugar stays high over time, a process called glycation occurs. Sugar molecules attach to proteins and fats, creating compounds called advanced glycation end products, or AGEs. These AGEs bind to a receptor called RAGE, which can trigger inflammation and damage throughout the body, including the heart.

The body produces natural defense molecules—esRAGE and sRAGE—that act like decoys, soaking up AGEs and limiting their harmful effects. Researchers believe the balance between damaging AGEs and protective RAGE molecules might influence heart health.

The research team studied 29 people with Type 1 diabetes who had no known heart disease, plus 31 healthy volunteers. They measured blood levels of two major AGEs (CML and MG-H1) and the protective molecules esRAGE and sRAGE. They also performed advanced ultrasound scans to look for subtle heart changes.

In the diabetes group, the researchers found lower levels of the protective esRAGE and higher CML levels. A specific ratio—CML divided by esRAGE—appeared to connect with signs of early heart strain visible on ultrasound. The longer someone had had diabetes and the higher their blood sugar control markers, the more pronounced these changes were.

This is an early-stage pilot study designed to explore a potential connection, not to prove a cause-and-effect relationship. The small number of participants means these findings cannot yet be applied in clinical practice or to make treatment decisions. Much larger studies would be needed to confirm whether measuring the CML/esRAGE ratio could reliably identify people at risk for heart problems.

If future research supports these findings, doctors might one day use a simple blood test to catch heart changes before they progress. But for now, this work opens a door for further investigation rather than providing a new clinical tool.

Source: BMC cardiovascular disorders. Evidence type: PubMed indexed literature. Type1Cure is an information and intelligence hub, not a medical advice service. This article summarizes published research and does not provide diagnosis, treatment, or personal medical guidance. Always talk to your own care team before changing anything about your Type 1 diabetes management.