Host-cell Protein Removal
Host-cell Protein Removal - Related Videos
11:06
Comparison of Tobacco Host Cell Protein Removal Methods by Blanching Intact Plants or by Heat Treatment of Extracts
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Cited by 27 •
2016
Three heat precipitation methods are presented that effectively remove more than 90% of host cell proteins (HCPs) from tobacco extracts prior to any other purification step. The plant HCPs irreversibly aggregate at temperatures above 60 °C.
03:34
Assessing Caspase-Mediated Cleavage of Viral and Host Proteins in Virus-Infected Cells
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2025
The video demonstrates a method to assess caspase-mediated protein cleavage in virus-infected cells. Post-viral infection, caspases get activated and degrade various host cellular proteins and viral nucleoproteins while specific caspase inhibitors prevent this degradation, as confirmed by western blotting.
03:44
A Double-Labeling Immunofluorescence Technique to Visualize Host and Pathogen Proteins in an Infected Cell
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2025
This video showcases double-labeling immunostaining with two different primary antibodies raised in the same species, binding specifically to parasite and host proteins. Furthermore, labeled secondary antibodies targeting these primary antibodies allow the distinct visualization of host and parasite proteins, facilitating the study of host-pathogen interaction.
04:15
Extracting Host Cell Lysate from Infected Host Cells Cultured in a Permeable Membrane System
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2025
This video demonstrates a permeable membrane insert system to investigate the impact of bacterial toxins on host cells in a controlled and isolated manner. This approach allows for the selective exposure of the cells to the toxins while maintaining a physical separation that mimics the natural host-pathogen interaction.
13:56
A Comparative Approach to Characterize the Landscape of Host-Pathogen Protein-Protein Interactions
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Cited by 4 •
2013
This article focuses on the identification of high-confident interaction datasets between host and pathogen proteins using a combination of two orthogonal methods: yeast two-hybrid followed by a high-throughput interaction assay in mammalian cells called HT-GPCA.
FAQs
The separation relies on physicochemical differences between unwanted host-cell proteins and the target molecule. Size can influence filtration behavior, while charge and hydrophobicity affect how proteins interact during chromatography. Selecting operations that exploit these differences allows the process to reduce diverse protein impurities without relying on a single separation principle, supporting broader and more consistent purification performance.
These operations contribute at different points in the downstream workflow. Clarification helps separate unwanted material from the manufactured product stream, filtration provides an additional size-related separation step, and chromatography distinguishes molecules through properties such as charge or hydrophobicity. Combining the operations improves impurity reduction because each stage can address host-cell proteins through a different physical basis.
Measuring residual host-cell proteins shows how effectively the manufacturing process controls this impurity class. The results help evaluate process performance and provide information relevant to potential risks associated with unwanted proteins. Monitoring also supports characterization and regulatory assessment by documenting the impurity profile of the resulting biopharmaceutical product rather than relying only on the intended product identity.
Efficiency depends on how clearly the target molecule differs from host-cell proteins in size, charge, and hydrophobicity, as well as on how the purification operations use those differences. Because biologic products and impurity mixtures can vary, the chosen combination of clarification, filtration, and chromatography affects the extent of reduction and the consistency of the final product.
A typical workflow applies clarification, filtration, and chromatography as successive purification operations. The process first uses separation steps to reduce unwanted material, then applies property-based operations that distinguish host-cell proteins from the target molecule. Testing for residual host-cell proteins after processing helps determine whether the workflow achieved the intended impurity reduction and supports evaluation of its performance.
Researchers apply this approach when producing recombinant biologics in host cells and when the product stream contains proteins originating from those cells. It is relevant to therapeutic proteins, vaccines, and other biologic products. Incorporating impurity reduction into downstream manufacturing helps create workflows that produce material suitable for consistent characterization, stability evaluation, and regulatory assessment.
Residual testing provides an indication of how much host-cell protein remains after downstream processing. Comparing results across a workflow helps evaluate process performance and supports characterization of product quality. The measurements also inform assessment of potential impurity-related risks and contribute evidence for regulatory review, making testing an important complement to the physical separation operations.
Controlling these impurities supports more consistent characterization of the manufactured product and contributes to evaluations of its stability. It also helps establish that the purification workflow performs reliably across the intended production process. In biology-focused manufacturing, this control is important because recombinant products, vaccines, and other biologics must be assessed not only for their target molecules but also for associated impurities.