Cryopreservation of Human Epidermal Skin Models
DESCRIPTION (provided by applicant): In an effort to reduce the use of animals for toxicity testing, companies have developed in vitro skin models or equivalents to replace the Draize skin irritation test. This development has been further pushed by a Euro
pean Union regulation that will prohibit the use of animals for collecting toxicological data on cosmetic ingredients beginning in 2009. Recently, the European Centre for the Validation of Alternative Methods (ECVAM) has validated two skin models to replac
e the Draize test. Supply of these engineered tissues skin equivalents is a significant issue that can be solved by development of effective cryopreservation methods. Presently, these constructs are made to order and require a lead time of several weeks be
fore they can be used. A cryopreserved product would be available when needed eliminating lead time required to manufacture the product. Additionally, performance of quality control checks for stock that is ready to be shipped could be performed and large
batches could be manufactured providing a cost savings to suppliers. A cryopreserved skin model would also provide the end-user greater flexibility for scheduling of experiments without concern regarding availability of the constructs and it would be possi
ble to order from the same batch of product in order to have better control of uniformity within research studies. This proposal is to determine the feasibility of cryopreserving these skin equivalents. The proposed studies will begin by establishing condi
tions for cryopreservation of keratinocytes in tissue culture plates and well inserts. The optimum preservation conditions would then be used for cryopreservation of a commercially available epidermal skin model containing keratinocytes established on well
inserts. It is anticipated that major innovation will be required due to the complexity of both the tissue and delivery system consisting of membrane inserts in multiwell plates. In Phase II studies, these conditions will be applied to other epidermal mod
els that are commercially available and to more complex models which contain more than one cell type. PUBLIC HEALTH RELEVANCE: Human epidermal skin models have been developed by several companies and two have been validated for use as in vitro repla
cements for the in vivo skin irritation test. A preservation method for these skin models will insure that these constructs are readily available when needed, providing a less expensive, consistent, quality controlled product. Success in this project will
help reduce the number of animals employed for research and increase availability of human test models that may be more predictive of toxicity and irritation in humans than current live animal models.
Small Business Information at Submission:
CELL AND TISSUE SYSTEMS, INC.
CELL AND TISSUE SYSTEMS, INC. 2231 Technical Parkway, Suite A NORTH CHARLESTON, SC 29406
Number of Employees: