Type 2 diabetes quietly damages blood vessels

For individuals living with type 2 diabetes, the risk of heart attack and stroke isn’t static; it increases with each passing year. New research from the Karolinska Institutet suggests that the duration of the condition plays a critical role in how diabetes impacts cardiovascular health, and specifically implicates red blood cells in this process.

The Timing of Risk

Red Blood Cells and Vascular Function

Researchers discovered a timing effect related to red blood cells. While red blood cells from people newly diagnosed with type 2 diabetes did not appear to harm blood vessels, those from individuals who had lived with the condition for an extended period did interfere with normal blood vessel function. This was also observed in animal models.

Did You Know? Researchers tracked patients over seven years and observed a change in their red blood cells – they developed disruptive properties similar to those seen in long-duration diabetes.

The study involved tracking a group of patients over time. Initially, their red blood cells showed no harmful effects on blood vessels. However, after seven years, these same red blood cells began to exhibit the same disruptive properties observed in individuals with long-standing type 2 diabetes.

MicroRNA-210: A Potential Key

The research points to a small molecule within red blood cells, called microRNA-210, as a potential driver of this change. Restoring microRNA-210 levels in red blood cells in experiments led to improved blood vessel function. This suggests that microRNA-210 may be a key mechanism in how red blood cells transition from neutral carriers of oxygen to contributors to vascular dysfunction.

Expert Insight: The identification of a potential molecular mechanism, like microRNA-210, is a significant step. It suggests that the cardiovascular complications of long-term diabetes may not be inevitable, and that interventions targeting this pathway could be possible.

The findings have practical implications. If clinicians could track microRNA-210 levels in red blood cells, it may be possible to identify individuals whose cardiovascular risk is increasing before significant damage occurs. Researchers are currently investigating whether this approach can be validated in larger population studies, potentially leading to the development of a new biomarker test.

Frequently Asked Questions

What role do red blood cells play beyond carrying oxygen?

Researchers focused on red blood cells because they do more than transport oxygen and have already been implicated in changes to how blood vessels behave in diabetes.

Does the length of time someone has type 2 diabetes matter for cardiovascular risk?

According to the study, it is not just having type 2 diabetes that matters, but how long someone has had the condition. Cardiovascular risk rises year by year.

What is microRNA-210 and why is it important?

MicroRNA-210 is a small regulatory molecule inside cells. Restoring its levels in red blood cells improved blood vessel function in experiments, suggesting it plays a role in the development of vascular dysfunction.

Could a simple blood test one day provide an early warning system for cardiovascular risk in people with long-term type 2 diabetes?