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SEKISUI XenoTech Adds Monkey, Rodent Hepatocytes to Patented CryostaX Product Line

Company Anticipates the End of Traditionally Cryopreserved Hepatocytes

Kansas City, KS- SEKISUI XenoTech is expanding its catalog of CryostaX® in vitro drug discovery and preclinical drug development test systems to include pooled Sprague-Dawley rat hepatocytes, which became available in July, CD-1 mouse hepatocytes, which were released this week, and Cynomolgus monkey hepatocytes, which are expected in October.

CryostaX® hepatocytes are liver cells that are prepared using a patented process that produces unique cryopreserved cell pellets. This single-freeze preparation process provides greater convenience to researchers, versatile pooling options, and minimizes freeze-thaw injury to the cells, which promotes high viability, cell yield and enzymatic activity for longer-term, consistent test results.

“Our pellet format allows us to design the largest pools of rat and mouse hepatocytes on the market in lot sizes that can last for years,” explained Maciej Czerwinski, Ph.D., Director of Consulting for SEKISUI XenoTech and inventor of the CryostaX® cryopreservation method. “Plus, customers love the ease-of-use of CryostaX. There is no need to thaw the hepatocytes to get them out of the vial, which can potentially lead to ‘over-thawing’ and cell damage.”

Since intact hepatocytes contain the major hepatic drug-metabolizing enzymes necessary for preclinical studies, they are a common in vitro test system for studies of metabolic stability, hepatic uptake and transporters, CYP induction screening, hepatotoxicity, etc. Due to the clear superiority of CryostaX® products, the company is looking into preparing more of its in vitro test systems with this method and foresees the elimination of cryopreserved hepatocytes prepared from traditional methods.

“Our hepatocyte expertise stems from decades of preparing these test systems for our own contract research,” commented Zell Woodworth, Products Division Director for SEKISUI XenoTech. “Utilizing the hepatocytes that we produce in our own contract studies not only allows for greater quality control, but also a deeper insight into the use of the test systems than what other hepatocyte vendors have. This unparalleled level of understanding and experience guides the decisions we make when developing new products and services.”

Benefits to Lab Efficiency and Performance

Researchers have stated how much they enjoy the increased efficiency gained by removing the unnecessary step of having to hold and swirl vials in a water bath while checking to see if the cells have sufficiently thawed to be released from the vial. Furthermore, by eliminating the need for water baths in or near culture hoods and incubators, a significant source of tissue culture contamination can be eliminated.

And since there is no need to thaw the hepatocytes in order to get them out of the vial, the cell damage that occurs during thaw processes is reduced. Customers have expressed increased confidence in using CryostaX® hepatocytes because they have reduced or eliminated variability due to differences in scientists’ skill levels and experience.

Limiting freeze-thaw injury from multiple cryopreservation steps also increases and prolongs metabolic activity. Data indicates benefits to cytochrome P450 (CYP), sulfotransferase (SULT) and especially UDP-glucuronosyltransferases (UGT) activity. CryostaX® hepatocytes can then be cultured for up to 48 hours without a medium change, giving a significantly extended incubation window in which to collect metabolism data. This provides data that is comparable to, in a format that is easier to use, and more cost effective than alternative methodologies used to assess metabolism of low-turnover compounds, which can otherwise be a challenge for ADME scientists.

For more information about SEKISUI XenoTech’s CryostaX® humanmonkey and rodent hepatocytes, please contact us.

About SEKISUI XenoTech

SEKISUI XenoTech, LLC is a global Contract Research Organization utilized by 98% of top pharma companies and numerous other organizations. For almost 25 years, the company has offered proven drug development expertise, providing an ever-evolving selection of cell and tissue-based productsscreeningradiolabeling, API manufacturing, in vitro ADME Tox and pharmacologyin vivo ADME Tox and QWBAmetabolite ID and productionbioanalytical services and consulting. SEKISUI XenoTech’s product selection includes a wide range of high-quality unique and standard reagents, including subcellular fractionshepatocytesmediatissue samplescell linesrecombinant enzymessubstrates & metabolites and more. The company also regularly prepares and delivers custom-designed products and services in response to client requests. For additional information, please refer to the company’s website at