Agnirva Space Premier League - Expedition #30701: Heart in Space: Modeling Cardiac Dysfunction Using 3D Micro-Tissues on the ISS

What happens to the human heart when it's in space? That’s exactly what Dr. Deok-Ho Kim and a team from Johns Hopkins University set out to discover with a cutting-edge experiment aboard the International Space Station (ISS).

The experiment uses human-induced pluripotent stem cells (iPSCs)—essentially adult cells that are reprogrammed to act like embryonic cells. Scientists grew these iPSCs into 3D cardiac tissues, mimicking real human heart cells. These mini heart models, also known as 3D microphysiological systems, were sent to space during Expedition 61/62 to investigate how microgravity affects cardiac function.

Why 3D heart models? Because they replicate the structure and function of human heart tissue better than traditional 2D cultures, allowing for a more realistic look at how space conditions alter heart cell behavior.

In space, the absence of gravity can reduce heart muscle mass and affect how it contracts. The iPSC-based system allows researchers to observe these changes at a cellular level—how heart cells beat, grow, and interact in microgravity.

The goal is to uncover the root causes of space-induced cardiac issues and test ways to prevent them. The data also help on Earth, especially for people with cardiovascular diseases, as it provides a new platform for drug testing and understanding disease mechanisms.

In summary, this heart-in-a-chip technology brings space biology and precision medicine together, showing how innovations in orbit can transform healthcare back on Earth.

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