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Tolerance and threshold in the extrinsic coagulation system.

Johannes Müller1, Stefan Brandt, Katrin Mayerhofer

  • 1Technical University Munich, Centre for Mathematical Sciences, Boltzmannstr. 3, D-85748 Garching/Munich, Germany. johannes.mueller@gsf.de

Mathematical Biosciences
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Summary

Blood flow and coagulation inhibitors create a threshold for the extrinsic coagulation cascade. This mechanism, involving supply, washout, and stabilization, ensures system-wide threshold behavior.

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Area of Science:

  • Biophysics
  • Hematology
  • Computational Biology

Background:

  • The extrinsic coagulation cascade is crucial for hemostasis.
  • Understanding its activation threshold is key to controlling bleeding and thrombosis.

Purpose of the Study:

  • To investigate mechanisms creating tolerance and activation thresholds in the extrinsic coagulation cascade.
  • To elucidate the roles of coagulation inhibitors and blood flow in this process.

Main Methods:

  • Developed a minimal four-dimensional model of the coagulation cascade.
  • Utilized time-scale analysis for mechanistic insights.
  • Interpreted simulation results from a larger, more complex model.

Main Results:

  • The interplay of blood flow and inhibitors generates threshold behavior.
  • Blood flow provides substance supply and washout, while inhibitors stabilize the resting state.
  • While initial steps lack threshold behavior, the overall system exhibits it due to feedback loops.

Conclusions:

  • The extrinsic coagulation cascade's threshold behavior arises from the combined effects of blood flow and inhibition.
  • Feedback loops, stabilized by antithrombin III (ATIII) and blood flow, are critical for system-wide threshold generation.