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Calpain activation in shear-induced platelet aggregation

K Fujitani¹, J Kambayashi, H Ariyoshi

¹Department of Surgery II, Osaka University Medical School, Japan.

Journal of Cellular Biochemistry

|July 1, 1997

Summary

High shear stress activates mu-calpain, a protease, in platelets, leading to talin breakdown. This suggests calpain

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Area of Science:

Biochemistry
Hematology
Cell Biology

Background:

Fluid shear stress is known to activate platelets, but the precise mechanism of shear-induced platelet aggregation (SIPA) remains unclear.
Calpain, a calcium-activated cysteine protease found in platelets, is implicated in platelet activation processes.

Purpose of the Study:

To investigate the potential activation and role of calpain in shear-induced platelet aggregation (SIPA).

Main Methods:

Utilized a novel aggregometer and specific monoclonal antibodies to detect calpain activation.
Applied varying shear stress gradients (6-108 dyn/cm²) to platelet samples.
Assessed mu-calpain activation and talin proteolysis under different shear stress conditions and durations.
Investigated the effect of calpeptin, a calpain inhibitor, on shear-induced platelet responses.

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Main Results:

Mu-calpain activation and talin proteolysis were observed exclusively in platelets subjected to high shear stress (>50 dyn/cm²).
Activation and proteolysis increased in a time- and shear-force-dependent manner.
Calpeptin completely inhibited mu-calpain activation and talin proteolysis but did not significantly alter SIPA profiles.

Conclusions:

Calpain activation and talin proteolysis are associated with high shear stress in platelets.
Calpain may play a role in the later stages of shear-induced platelet activation, particularly in cytoskeletal reorganization.
The findings suggest calpain is involved in the response to high shear stress but not the primary driver of SIPA itself.