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Spaceflight significantly alters human aortic smooth muscle cells (HASMCs), down-regulating key genes involved in vascular tone and function. Understanding these transcriptomic changes is crucial for mitigating cardiovascular deconditioning during long-duration space missions.

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Area of Science:

  • Cardiovascular Physiology
  • Space Medicine
  • Molecular Biology

Background:

  • Spaceflight poses significant risks to the cardiovascular system, leading to deconditioning.
  • Microgravity exposure causes loss of vascular tone, reduced blood volume, and diminished cardiac output.
  • Understanding cellular changes in vasculature is key to addressing spaceflight-induced cardiovascular issues.

Purpose of the Study:

  • To assess transcriptomic alterations in human aortic smooth muscle cells (HASMCs) during spaceflight.
  • To identify specific genes and pathways affected by microgravity.
  • To provide insights into vascular dysfunction in astronauts.

Main Methods:

  • Human aortic smooth muscle cells (HASMCs) were cultured for 3 days in microgravity aboard the International Space Station.
  • RNA-Sequencing (RNA-Seq) analysis was performed to assess global gene expression changes.
  • QIAGEN Ingenuity Pathway Analysis software was used to interpret transcriptomic data.

Main Results:

  • Spaceflight induced significant transcriptional alterations, affecting 4422 genes in HASMCs.
  • Key markers for contractile, synthetic, and osteogenic phenotypes, including alpha-smooth muscle actin (αSMA), matrix metalloproteinases (MMPs), and bone morphogenic proteins (BMPs), were down-regulated.
  • Cellular signaling pathways such as STAT3, NFκB, PI3K/AKT, HIF1α, and Endothelin pathways were notably impacted.

Conclusions:

  • HASMCs exhibit substantial transcriptomic changes during spaceflight.
  • These alterations suggest a shift away from normal vascular smooth muscle cell functions.
  • The findings are critical for understanding and potentially counteracting spaceflight-induced cardiovascular deconditioning.