Von Willebrand Factor
Von Willebrand Factor - Related Videos
08:30
Investigating von Willebrand Factor Pathophysiology Using a Flow Chamber Model of von Willebrand Factor-platelet String Formation
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Cited by 6 •
2017
In this paper, we describe a method to assess endothelial von Willebrand factor release and the subsequent platelet capture under fluid shear stress in response to inflammatory stimuli using an in vitro flow chamber system.
07:49
Measuring Changes in Tactile Sensitivity in the Hind Paw of Mice Using an Electronic von Frey Apparatus
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Cited by 99 •
2013
Electronic von Frey measurements are an effective and improved alternative to classical von Frey filaments, as they allow rapid and precise measurement of changes in rodent mechanical withdrawal thresholds to continuously applied pressure stimuli before and after an inflammatory event.
03:10
Von Kossa Staining of Aortic Vascular Smooth Muscle Cells: An In Vitro Technique for Assessment of Arterial Medial Layer Calcification
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2025
This video demonstrates a staining technique for assessing arterial medial calcification of the vascular smooth muscle cells in vitro. The von Kossa method employs a photochemical reaction to deposit metallic silver at the sites of calcification and impart a black coloration.
05:40
Dural Stimulation and Periorbital von Frey Testing in Mice As a Preclinical Model of Headache
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Cited by 13 •
2021
The most notable symptom of migraine is severe head pain, and it is hypothesized that this is mediated by sensory neurons innervating the meninges. Here, we present a method to locally apply substances to the dura in a minimally invasive manner while using facial hypersensitivity as an output.
06:31
Assessment of Midline Lingual Point-Pressure Somatosensation Using Von Frey Hair Monofilaments
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Cited by 9 •
2020
This work describes a standard method to assess tactile sensation at the midline of the tongue tip. Using Von Frey Hair (VFH) monofilaments, this protocol provides estimates of detection and discrimination threshold estimates for oral point pressure (OPP).
FAQs
The multimeric architecture of von Willebrand factor provides the structural context for its two major hemostatic roles. At an injury site, the molecule participates in binding exposed collagen and capturing platelets through platelet glycoprotein Ib; in circulation, it associates with factor VIII. Studying this organization connects molecular structure with platelet adhesion and coagulation-factor stability.
After vascular damage exposes collagen, von Willebrand factor binds that surface and provides a capture pathway for platelets through platelet glycoprotein Ib. This sequence links the damaged vessel wall to platelet recruitment, an early event in primary hemostasis. The interaction is important for understanding how molecular binding events become localized where bleeding control is required.
In the bloodstream, von Willebrand factor protects coagulation factor VIII from degradation. This role differs from its participation in platelet capture because it preserves the availability of a coagulation component rather than attaching platelets to exposed vessel-wall material. Examining both functions helps explain how abnormalities can disrupt bleeding control through more than one hemostatic pathway.
Quantity and activity measurements examine complementary aspects of von Willebrand factor. Quantity addresses how much of the protein is present, whereas activity indicates whether it can perform its relevant hemostatic functions. Using both types of measurement helps evaluate von Willebrand factor more completely during investigation of bleeding disorders and supports a more informative diagnostic assessment.
Measurements of von Willebrand factor quantity and activity contribute to the evaluation of both inherited and acquired bleeding disorders. Considering these results together helps investigators determine whether an abnormal bleeding pattern may involve this protein and supports diagnostic distinction between disorder categories. The approach is especially useful because von Willebrand factor contributes to platelet biology and factor VIII stability.
Research on von Willebrand factor extends from diagnostic measurement to the study of its structure and regulation. This work provides insight into platelet biology, vascular function, and the mechanisms of hemostasis. In biology, the protein therefore serves as a connection between molecular interactions at injured vessels and broader questions about how organisms control bleeding.