Source: Stem cell exosomes may be hypoxic pulmonary hypertension therapy, Pulmonary Hypertension News, 28 Jul 2025. Summary written by Future Health GCC.

What happened

Researchers in China have published a study in Scientific Reports suggesting that exosomes from mesenchymal stem cells could one day help treat hypoxic pulmonary hypertension. The work was done in laboratory-grown cells and in rats, not in people.

The condition

Hypoxic pulmonary hypertension happens when low oxygen levels raise the pressure in the blood vessels of the lungs. Over time, the muscle cells in the vessel walls grow and move abnormally, making the walls thicker and forcing the heart to work harder. Current medicines relax the blood vessels, but they do not work for everyone.

What they did and found

Exosomes are very small particles that cells release to send signals to other cells. The team collected exosomes from bone marrow-derived mesenchymal stem cells grown in the lab.

In cell experiments, the exosomes slowed the abnormal growth and movement of the muscle cells that line the lung arteries. In rats kept in low-oxygen conditions for four weeks, exosome treatment significantly reduced the pressure in the right side of the heart and the thickening of the heart muscle.

The researchers found that the exosomes appeared to work by blocking two proteins, EGFR and ErbB2, from pairing up, which seems to drive the harmful changes.

How far along it is

This is early, preclinical research. Results in rats often do not carry over to people, and many more studies would be needed before any treatment could be tested in patients.

What it means for families

It helps scientists understand how stem cell signals might protect blood vessels. It is not a treatment, and exosome therapies for pulmonary hypertension remain experimental.

Read the original article on Pulmonary Hypertension News →

This is a summary of published research, written by Future Health GCC. It is not medical advice. Speak to your doctor about any treatment.

Photo: Linda Bartlett, via Wikimedia Commons (public domain).