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Related Experiment Videos

Rat brain capillary thrombomodulin: structure and function

L Wang1, N D Tran, S S Schreiber

  • 1Department of Neurosurgery, University of Southern California, School of Medicine, Los Angeles 90033, USA.

Thrombosis Research
|December 16, 1998
PubMed
Summary
This summary is machine-generated.

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Thrombomodulin (TM), an anticoagulant protein, is crucial for brain hemostasis. Its highly conserved sequences across species suggest a vital, similar role in both brain and systemic blood vessels.

Area of Science:

  • Biochemistry
  • Vascular Biology
  • Neuroscience

Background:

  • Transmembrane glycoprotein thrombomodulin (TM) is expressed on endothelial cells and plays an anticoagulant role.
  • TM and its mRNA are found in brain microvessels, enabling protein C activation.
  • Stroke risk factors impair brain protein C activation by downregulating TM.

Purpose of the Study:

  • To investigate the role of TM in brain hemostasis using a rat model.
  • To determine the TM sequence in rat brain capillaries and compare it with other species.
  • To understand the evolutionary conservation of TM's structure and function.

Main Methods:

  • Partial sequencing of TM mRNA from rat brain capillaries.
  • Deduction of amino acid sequences for rat TM.

Related Experiment Videos

  • Comparative analysis of TM sequences across species (rat, mouse, bovine, human).

    • Main Results:

    • High sequence homology (77-100%) between rat and mouse TM, particularly in functional domains like epidermal growth factor repeats (EGFRs) and the transmembrane region.
    • Significant homology (92-96% for transmembrane region) observed between rat, bovine, and human TM.
    • Conservation of all cysteine residues and key amino acids essential for protein C activation.

    Conclusions:

    • The highly conserved TM sequences across species suggest a similar anticoagulant function in both brain and systemic vascular endothelial cells.
    • Rat TM shares significant structural similarities with TM from other mammals, validating its use as a model for stroke research.
    • The findings underscore the fundamental importance of TM in maintaining vascular hemostasis.