Health · Medical Research · 3 hrs ago
Study Links Muscle Protein Miro1 to Insulin Resistance in Type 2 Diabetes
Researchers linked high levels of the muscle protein Miro1 to insulin resistance in people with Type 2 diabetes.
Miro1 is found on mitochondria, which help cells produce energy, and muscles normally take glucose from the blood in response to insulin.
Removing Miro1 restored insulin responsiveness in preclinical models, suggesting the protein can affect how muscle responds to insulin.
In a randomized trial, people with obesity and Type 2 diabetes who did aerobic exercise had lower muscle Miro1 levels, alongside improved insulin sensitivity and energy production.
The human results show a connection, but do not prove that lowering Miro1 caused the benefits of exercise.
Miro1 may offer a new treatment target, and researchers say further work could lead to treatments that complement exercise; John P. Kirwan will continue studying diabetes mechanisms and potential treatments.
Researchers found that high levels of the muscle protein Miro1 were linked to impaired insulin responses in people with Type 2 diabetes.
Removing Miro1 restored insulin responsiveness in preclinical models.
In a randomized controlled trial, participants with obesity and Type 2 diabetes who did aerobic exercise had lower muscle Miro1 levels and improved insulin sensitivity.
The human findings show an association but do not prove that reducing Miro1 caused exercise’s benefits.
The researchers say Miro1 could be a potential target for treatments that complement exercise.
- Who
- Researchers led by senior author Dr. John P. Kirwan studied Miro1 in cells, preclinical models and people with Type 2 diabetes.
- What
- The study linked excess Miro1 in skeletal muscle to impaired insulin responses and found that exercise was associated with lower Miro1 levels.
- When
- Published October 30, 2026.
- Where
- The research was led at LSU’s Pennington Biomedical Research Center.
- Why
- Researchers investigated the molecular causes of muscle insulin resistance and how exercise may improve insulin sensitivity.
This story does not have two clearly opposing sides.
This story does not have a timeline yet.
- Protein
- Miro1, or Mitochondrial Rho GTPase1
- Publication
- Nature Communications
- Human study
- Randomized controlled trial involving participants with obesity and Type 2 diabetes
- Exercise finding
- Aerobic exercise was associated with lower muscle Miro1 levels and improved insulin sensitivity
- Preclinical finding
- Removing Miro1 restored insulin responsiveness in preclinical models
What people are saying
Insulin resistance in muscle is at the heart of Type 2 diabetes, and its molecular causes have remained frustratingly unclear.
For the field, this is a new therapeutic target.
This research exemplifies the breadth of scientific discovery at Pennington Biomedical, where research spans all levels, from basic science that reveals the biological mechanisms underlying disease to clinical studies and population-based research that informs public health.