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Area of Science:

  • * Comparative proteomics
  • * Mammalian physiology
  • * Hemostasis and thrombosis

Background:

  • * Hibernating mammals survive extreme cold and reduced blood flow without dangerous blood clots.
  • * Cold temperatures typically activate platelets, leading to issues in blood storage and transfusion.
  • * 13-lined ground squirrels, with hibernation temperatures of 4°C-8°C, serve as a model for studying platelet cold storage lesion resistance.

Purpose of the Study:

  • * To investigate the molecular mechanisms underlying hemostatic adaptations in hibernating ground squirrels.
  • * To compare the platelet proteome of active, entrance, and torpor states.
  • * To identify how platelet protein changes support survival during hibernation.

Main Methods:

  • * Proteomic analysis of platelets from 11 ground squirrels across active (summer), entrance (fall), and torpor (winter) states.
  • * Tandem mass tag (TMT) labeling and liquid chromatography-tandem mass spectrometry (LC-MS/MS) for quantitative protein analysis.
  • * Quantification of over 700 proteins with significant abundance variations.

Main Results:

  • * Significant proteomic changes were observed in ground squirrel platelets during hibernation.
  • * Key protein systems involved in translation, secretion, metabolism, complement, and coagulation cascades showed variations.
  • * Species-specific differences in hemostatic, secretory, and inflammatory regulators were noted compared to human platelets.

Conclusions:

  • * Systematic proteomic alterations in platelets likely enable physiological adaptations for survival during hibernation.
  • * This research provides the first proteomic characterization of platelets in hibernating animals.
  • * Findings may inform strategies to enhance cold storage of human platelets for transfusion.