Mini Human Heart – Researchers at Michigan State University have developed a lab-grown mini heart that replicates atrial fibrillation, an arrhythmia causing irregular, rapid heartbeats. The condition impacts around 60 million people globally and has seen little progress in treatment over recent decades.
A team led by Aitor Aguirre at MSU developed the model using cardiac organoids—active, 3D miniature versions of the human heart. The researchers have been refining these heart models since 2020 and recently modified them to mimic atrial fibrillation.
Tiny Heart Organoids Advance Cardiac Research
Roughly the size of a lentil, the organoids are regarded as highly precise models of the human heart. They give researchers an unprecedented way to study heart development, disease progression, and drug responses. Their contractions are powerful enough to be visible without a microscope.
Created from donated human stem cells, the mini-hearts feature complex structures that resemble real heart chambers and vascular systems made up of arteries, veins, and capillaries. Scientists say these characteristics allow the organoids to closely imitate the function of an actual human heart.
One of the team’s latest breakthroughs was adding immune cells known as macrophages to the organoids, an achievement led by medical student and researcher Colin O’Hern. These cells are essential to heart development and support the proper formation of the organ.
Scientists Recreate Atrial Fibrillation in Mini-Hearts
Adding macrophages triggered inflammation in the organoids, producing atrial fibrillation-like irregular beats and allowing researchers to directly observe diseased human heart tissue for the first time, according to O’Hern.
In the experiments, inflammatory molecules caused the mini-hearts to beat abnormally, while an anti-inflammatory medication partially restored a normal rhythm, highlighting the model’s promise for testing future treatments.
Current therapies for atrial fibrillation mainly target symptoms rather than the underlying causes of the disease. Researchers say drug development has been slowed because animal models don’t accurately replicate human biology. According to Aitor Aguirre, the new organoid model could change that.
Researchers “Age” Mini-Hearts to Test New Treatments
Beyond reproducing arrhythmia, the scientists also designed a way to artificially “age” the organoids so they more closely resemble adult hearts. They achieved this by exposing the tissues to inflammation levels associated with atrial fibrillation. Using the model, the team successfully restored normal heart rhythms with a drug previously predicted to work in testing.
The study found that innate immune cells in the heart help regulate development and heartbeat, providing new insight into common congenital heart defects.
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