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Related Experiment Videos

Some functional properties of teleost antithrombin

R Salte1, K Norberg, O R Odegaard

  • 1AKVAFORSK (Institute of Aquaculture Research Ltd), As, Norway.

Thrombosis Research
|November 1, 1995
PubMed
Summary

Fish antithrombin (AT) effectively inhibits thrombin, similar to human AT, with optimal activity at pH 7.8-8.4. Salmonid AT functions across a wide temperature range, unlike human AT, showing near-independence from temperature variations.

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Area of Science:

  • Biochemistry
  • Comparative Physiology
  • Enzymology

Background:

  • Antithrombin (AT) is a key regulator of coagulation, primarily studied in humans.
  • Understanding AT function in diverse species, like bony fish (Teleostei), provides insights into evolutionary adaptations of hemostasis.

Purpose of the Study:

  • To investigate the functional characteristics of antithrombin from Atlantic salmon and rainbow trout.
  • To compare the thrombin-antithrombin interaction in teleost species with the human system, focusing on cofactor (heparin) and environmental factor dependencies (pH, temperature).

Main Methods:

  • In vitro assays measuring thrombin inactivation by purified antithrombin and diluted fish plasma.
  • Enzyme-inhibitor kinetic studies were performed across varying pH, heparin concentrations, and temperatures.

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Main Results:

  • Teleost antithrombin effectively inactivates thrombin, with activity enhanced by heparin, similar to human antithrombin.
  • Optimal activity for salmonid antithrombin-thrombin interaction occurred at pH 7.8-8.4.
  • Teleost antithrombin-thrombin interactions demonstrated significant functional capacity at low temperatures (down to 3°C) and were largely temperature-independent, a key distinction from the human system.

Conclusions:

  • Teleost antithrombin shares functional similarities with human antithrombin, particularly in heparin dependence and optimal pH range.
  • The temperature independence of teleost thrombin-antithrombin interactions represents a significant functional adaptation to varying aquatic environments.
  • These findings highlight the evolutionary plasticity of the coagulation system's regulatory mechanisms.