What question did this study set out to answer?

This research aims to understand how platelet binding impacts factor VIII stability and activity.

December 8, 2025BloodOpen Access

Platelets stabilize factor VIIIa against loss of activity through subunit dissociation

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Authors

JSJialan Shi LGLindsey A. GeorgeChildren's Hospital of Philadelphia GGGary E. GilbertVA Boston Healthcare System

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Implication

Experiments demonstrate that platelets stabilize factor VIIIa and enhance its activity compared to phospholipid vesicles, pointing to potential implications for FVIII assays.

Key Points

This research aims to understand how platelet binding impacts factor VIII stability and activity.
Used recombinant factor VIII variants and platelets in clotting assays
Tested FVIII and emicizumab on platelets vs. phospholipid vesicles
Measured clotting times and activity decay rates using chromogenic substrates
Performed site-directed mutagenesis to assess A2 domain stability
Factor VIII activity was significantly enhanced on platelets compared to phospholipid vesicles
Platelet-bound FVIII exhibited slower activity decay than on vesicles
Platelet binding sites preferentially protect FVIIIa from dissociation during clotting
The protective effect was less pronounced for FVIII mutants with altered cleavage sites

Cite This Study

Shi et al. (2025) studied this question.

synapsesocial.com/papers/69362f6e4fa91c937236e101 https://doi.org/10.1182/blood-2025-4837

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Implication

Experiments demonstrate that platelets stabilize factor VIIIa and enhance its activity compared to phospholipid vesicles, pointing to potential implications for FVIII assays.

Platelets stabilize factor VIIIa against loss of activity through subunit dissociation

Discussion

Member takes

Implication

Key Points

Cite This Study

Platelets stabilize factor VIIIa against loss of activity through subunit dissociation

Discussion

Member takes

Implication

Key Points

Cite This Study

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