Space microgravity improves proliferation of human iPSC-derived cardiomyocytes

Area of Science:

• Space biology
• Cardiovascular research
• Stem cell science

Background:

• Cellular properties change significantly in microgravity.
• The response of human cardiac progenitors to space microgravity is not well understood.

Purpose of the Study:

• To investigate the effect of space microgravity on the differentiation of human induced pluripotent stem cell (hiPSC)-derived cardiac progenitors.
• To compare microgravity cultures with 1G cultures on the International Space Station (ISS).

Main Methods:

• Cryopreserved 3D cardiac progenitors were cultured for 3 weeks on the ISS.
• Comparison of microgravity cultures with 1G controls.

Main Results:

• Microgravity cultures exhibited 3-fold larger sphere sizes and 20-fold higher nuclei counts compared to 1G.
• Increased expression of proliferation markers was observed in microgravity.
• Cardiomyocytes generated in microgravity showed improved Ca2+ handling and increased expression of contraction-associated genes.
• Short-term (3-day) microgravity exposure upregulated genes related to proliferation, survival, cardiac differentiation, and contraction.

Conclusions:

• Space microgravity promotes the proliferation of hiPSC-cardiomyocytes.
• Microgravity-generated hiPSC-cardiomyocytes possess appropriate structure and function.
• Findings suggest microgravity conditions can enhance cardiac progenitor cell development for research applications.