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Simulated Microgravity Causes Delayed Platelet Activation and Downregulates Acid-Sensing Ion Channel 1/2 Protein

Niharika Bala1,2, Ling Yu1, Neil S Harris3

  • 1Division of Nephrology, Hypertension, and Renal Transplantation, Department of Medicine, University of Florida, Gainesville, FL 32610, USA.

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|December 30, 2025
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Summary
This summary is machine-generated.

Microgravity exposure delays human platelet activation by reducing acid-sensing ion channel (ASIC) protein expression and altering membrane composition. This impacts cell function and blood clotting mechanisms.

Keywords:
ASICmembrane fluidityplateletssimulated microgravitysphingomyelin

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Area of Science:

  • Cellular Biology
  • Space Medicine
  • Physiology

Background:

  • Microgravity affects cellular functions like gene expression and signal transduction.
  • Ion channels are crucial for cell physiology, regulating permeability, volume, and mechanosensation.
  • Plasma membrane lipid composition and fluidity influence ion channel activity.

Purpose of the Study:

  • To investigate the effect of simulated microgravity on human platelet activation.
  • To determine changes in acid-sensing ion channel (ASIC) protein expression and plasma membrane properties under microgravity.
  • To hypothesize a mechanism linking microgravity, ASIC expression, membrane fluidity, and platelet activation.

Main Methods:

  • Human platelets were subjected to simulated microgravity using a rotating wall vessel for 5 days at 37°C.
  • Platelet activation was assessed using thromboelastography.
  • Protein expression of ASIC1/2 was analyzed via Western blotting and immunofluorescence microscopy.
  • Plasma membrane fluidity and sphingomyelin concentration were measured.

Main Results:

  • Simulated microgravity significantly delayed human platelet activation compared to normal gravity.
  • ASIC1/2 protein expression was significantly downregulated in platelets under simulated microgravity.
  • Increased membrane fluidity and decreased sphingomyelin concentration were observed in microgravity-exposed platelets.

Conclusions:

  • Simulated microgravity delays human platelet activation.
  • This delay is associated with decreased ASIC1/2 protein expression and reduced sphingomyelin levels in the platelet plasma membrane.
  • These findings suggest a novel mechanism involving ion channels and membrane lipids affecting platelet function in microgravity.