Heparin Blocking
Heparin Blocking - Related Videos
02:21
Purification of Viral Integrase Using Heparin Affinity Chromatography
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2026
Source: Lopez Jr., M. et al. Detection and Removal of Nuclease Contamination During Purification of Recombinant Prototype Foamy Virus Integrase. J. Vis. Exp. (2017)This video demonstrates the procedure for purifying viral integrase from bacterial nuclease contamination using heparin Sepharose column chromatography followed by SDS-PAGE analysis to confirm protein purity.
10:41
Using a GFP-tagged TMEM184A Construct for Confirmation of Heparin Receptor Identity
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Cited by 2 •
2017
A construct encoding TMEM184A with a GFP tag at the carboxy-terminus designed for eukaryotic expression, was employed in assays designed to confirm the identification of TMEM184A as a heparin receptor in vascular cells.
12:27
Polyelectrolyte Complex for Heparin Binding Domain Osteogenic Growth Factor Delivery
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Cited by 2 •
2016
Self-assembled polyelectrolyte complexes (PEC) fabricated from heparin and protamine were deposited on alginate beads to entrap and regulate the release of osteogenic growth factors. This delivery strategy enables a 20-fold reduction of BMP-2 dose in spinal fusion applications. This article illustrates the benefits and fabrication of PECs.
01:30
Anticoagulant Drugs: Low-Molecular-Weight Heparins
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2024
Hemostasis is a crucial process that prevents excessive blood loss from damaged blood vessels. It involves various mechanisms such as vasoconstriction, platelet adhesion and activation, and fibrin formation. The importance of each mechanism depends on the type of vessel injury. In contrast, thrombosis is the abnormal formation of a blood clot within the blood vessels, leading to potential complications if the clot obstructs blood flow. Thrombosis can be caused by increased coagulability of the...
03:40
Heparin Affinity Chromatography-Based Baculovirus Purification: A Technique to Isolate Baculovirus From Insect Cell Supernatant
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2025
In this video, we demonstrate the technique to isolate baculovirus from an insect cell supernatant using heparin affinity chromatography. The isolation is facilitated by the affinity between the heparin in the column to the baculovirus envelope glycoprotein.
FAQs
Heparin can act as a soluble mimic of cell-surface heparan sulfate, allowing it to compete for pathogen or viral attachment proteins. If this competition reduces binding to host-cell surfaces, the result supports a role for glycosaminoglycan recognition in attachment. This provides mechanistic evidence about how a microbe identifies susceptible host cells.
Comparing effects in cell-binding assays with effects in entry assays can help separate an attachment defect from disruption of a later infection step. Reduced cell association suggests interference with surface recognition, whereas different results in entry measurements indicate that attachment and subsequent entry should be considered separately when interpreting the interaction.
A factor that binds heparin and contributes to host-cell association becomes a candidate heparin-binding attachment factor. Blocking assays can therefore connect a molecular interaction with a functional consequence, rather than merely showing that binding occurs. These findings also help explain pathogen tropism, meaning the tendency to recognize particular host-cell surfaces.
Researchers incorporate heparin into cell-binding, entry, and inhibition assays, then examine how the added competitor affects the measured interaction. Cell-binding formats focus on surface association, entry assays address progression into host cells, and inhibition assays evaluate whether interference can reduce infection-related activity. Together, these formats provide complementary evidence.
A decrease in cell association is consistent with competition between heparin and host-cell glycosaminoglycans for pathogen or viral attachment proteins. It supports involvement of heparan sulfate-like interactions, but the assay context remains important because binding and entry measure different stages. Comparing both outcomes helps avoid assigning an attachment effect to a later process.
The approach links pathogen surface recognition with host-cell susceptibility, making it useful for studying how infections begin at the cell surface. It can clarify receptor-related features of tropism and help assess heparin-like compounds as experimental inhibitors. In this context, heparin serves both as a mechanistic probe and as a basis for evaluating anti-infective strategies.