Simulated microgravity significantly altered metabolism in epidermal stem cells

Area of Science:

• Space biology
• Cellular metabolism
• Biotechnology

Background:

• Microgravity affects human systems, including cardiovascular, muscular, and immune functions.
• Simulated microgravity (SMG) impacts various cell types, potentially leading to conditions like anemia and fluid loss.
• Epidermal stem cells (EpSCs) play a vital role in skin health and repair.

Purpose of the Study:

• To investigate the metabolic profile of EpSCs under simulated microgravity.
• To identify specific metabolites and pathways affected by SMG in EpSCs.
• To provide insights into the mechanisms of stress injury and trauma repair in microgravity.

Main Methods:

• Epidermal stem cells (EpSCs) were cultured using a rotary cell culture system (RCCS) bioreactor to simulate microgravity.
• Metabolite identification was performed using liquid chromatography-mass spectrometry (LC-MS).
• Statistical analysis, including partial least squares discriminant analysis (PLS-DA), was employed to identify significant metabolic changes.

Main Results:

• A total of 57 differentially expressed metabolites were identified in EpSCs under SMG compared to normal gravity (NG).
• Key affected metabolite categories included lipids (51 molecules) and amino acids (5 molecules).
• SMG led to significant alterations in amino acid, lipid, membrane transport, and cell growth/death pathways, with 23 metabolites downregulated and 34 upregulated.

Conclusions:

• Simulated microgravity significantly alters the metabolic profile of epidermal stem cells.
• The identified metabolic shifts provide a basis for understanding EpSC behavior under microgravity.
• Further exploration of these metabolic changes offers a novel approach to studying stress injury and trauma repair mechanisms in space environments.