Expression systems – removing their contaminants

CHO, E. Coli and Pichia are useful expression systems for drug production. This can be for proteins, enzymes or antibody productions. Research and development for therapeutic perspectives requires a high level of quality controls. Such expression systems contain +1000 host cell proteins (HCPs). A major challenge in biological component production is to remove this HCP contamination. In order to monitor removal efficiency (during protein purification, as mentioned further on in this article), Canopy Biosciences have developed and optimised HCP detection kits based on the principle of the sandwich ELISA test as illustrated below.

Principle of the HCP Detection assay is based on sandwich ELISA test – by Canopy Biosciences at tebu-bio.com

HepatoSure® is a pool of human hepatocytes designed to facilitate your DMPK applications with a consistent hepatocyte product over time (years). HepatoSure® is best suited for both discovery and development of ADME-Tox study assays where generation and comparison of data is required. Let’s take a closer look, and you might like to benefit from our current offer to try these for yourself (see below).

Functionality and viability of primary cells can be impaired by incorrect thawing procedures, storage or culture conditions. It’s generally admitted that applying the same protocols as for cell lines leads will lead to bad cell quality. Well, based on our experience with primary cells, here are a few tips you can follow to ensure you get the best performance.

Exploring the small RNA transcriptome, a key challenge

Small RNA are involved in numerous biological process and linked to a wide range of conditions. For example miRNA can be used for detection of cancers from blood samples and are used for cancer classification. They are involved in the regulation of the messenger RNA translation.

The small RNA transcriptome is a vast world rich in information. There are not only miRNA but other small RNA that can also be used for diagnostics. For example, Repetto et al in 2015 (doi: 10.1186/s12916-015-0489-y) discovered novel small RNA in blood, s-RNY1-5p as a diagnostic biomarker for atherosclerosis-related diseases. The authors used small-RNA sequencing with the innovative CleanTag technology.