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Factor XIII is not involved in human platelet-collagen interaction
1First Department of Internal Medicine, Hirosaki University School of Medicine, Japan.
The Tohoku Journal of Experimental Medicine
|September 1, 1989
Summary
Factor XIII (FXIII) does not influence human platelet adhesion to collagen. However, FXIII in plasma does bind to collagen, indicating distinct roles in hemostasis.
Area of Science:
- Hematology
- Biochemistry
- Platelet Biology
Background:
- Factor XIII (FXIII) is a transglutaminase crucial for hemostasis.
- Platelet-collagen interactions are fundamental to primary hemostasis and thrombosis.
Purpose of the Study:
- To investigate the role of FXIII in human platelet adhesion to collagen.
- To determine if FXIII in plasma binds to collagen.
Main Methods:
- Assessed formaldehyde-fixed washed platelets (FWP) and non-fixed platelets' adhesion to type I collagen using aggregometry, collagen-immobilized glass beads, and in vitro bleeding time.
- Measured FXIII binding to collagen in normal human plasma at varying collagen concentrations.
- Utilized FXIII-deficient patient platelets and anti-FXIII antibodies to assess FXIII's functional role.
Main Results:
- FXIII addition or antibody inhibition did not alter FWP adhesion to collagen.
- Platelets from FXIII-deficient patients showed normal collagen-induced aggregation and adhesion.
- FXIII in normal human plasma demonstrated concentration-dependent binding to collagen.
Conclusions:
- FXIII is not directly involved in the interaction between human platelets and type I collagen.
- FXIII present in plasma does bind to collagen, suggesting a role independent of direct platelet interaction.