Abstract: Decellularization of tendon tissue plays a pivotal role in current tissue engineering approaches for in vitro research as well as for translation of graft-based tendon restoration into clinics. Automation of essential decellularization steps like freeze-thawing is crucial for the development of more standardized decellularization protocols and commercial graft production under good manufacturing practice (GMP) conditions in the future. In this study, a liquid nitrogen-based controlled rate freezer was utilized for automation of repeated freeze-thawing for decellularization of equine superficial digital flexor tendons. Additional tendon specimens underwent manually performed freeze-thaw cycles based on an established procedure. Tendon decellularization was completed by using non-ionic detergent treatment (Triton X-100). Effectiveness of decellularization was assessed by residual nuclei count and calculation of DNA content. Cytocompatibility was evaluated by culturing allogeneic adipose tissue-derived mesenchymal stromal cells on the tendon scaffolds. There were no significant differences in decellularization effectiveness between samples decellularized by the automated freeze-thaw procedure and samples that underwent manual freeze-thaw cycles. Further, we inferred no significant differences in the effectiveness of decellularization between two different cooling and heating rates applied in the automated freeze-thaw process. Both the automated protocols and the manually performed protocol resulted in roughly 2% residual nuclei and 13% residual DNA content. Successful cell culture was achieved with samples decellularized by automated freeze-thawing as well as with tendon samples decellularized by manually performed freeze-thaw cycles. Automated freeze-thaw cycles performed by using a liquid nitrogen-based controlled rate freezer were as effective as previously described manual freeze-thaw procedures for decellularization of equine superficial digital flexor tendons. The automation of this key procedure in decellularization of large tendon samples is an important step towards the processing of large sample quantities under standardized conditions. Furthermore, with a view to the production of commercially available tendon graft-based materials for application in human and veterinary medicine, the automation of key procedural steps is highly required to develop manufacturing processes under GMP conditions.
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This research explores the use of automated freeze-thaw cycles, using a liquid nitrogen based controlled-rate freezer, to decellularize equine tendon tissue. The results indicated that automated processes were as effective as established manual methods, showing promise for standardization and commercial production of graft-based tendon restoration under good manufacturing practices.
Tissue Decellularization and Its Importance
The decellularization of tendon tissue plays a central role in tissue engineering, both for in-vitro studies and in methods using graft-based techniques for tendon restoration.
The study is focused on how this decellularization process can be automated, in a push for greater standardization, consistency, and efficiency in the process.
Methodology
The research team used a liquid nitrogen-based controlled rate freezer to automate the repeatability of the freeze-thaw cycle that is integral to tendon decellularization.
For comparison, manual freeze-thaw cycles were also performed using previous procedural methods.
The final stage of the tendon decellularization involved the use of a non-ionic detergent treatment.
The team evaluated the effectiveness of its decellularization technique by calculating residual nuclei and DNA content.
It further studied the cytocompatibility of the treated tissue by culturing mesenchymal stromal cells derived from allogeneic adipose tissue on the tendon scaffolds.
Findings
The results showed no significant variation between tendons decellularized using the automated freeze-thaw cycles and those decellularized via manual methods.
Tendons treated using automated and non-automated methods showed roughly 2% residual nuclei and 13% residual DNA content, which is a successful result for the desired decellularization.
Additionally, successful cell culture was feasible with samples processed by both automated and manual freeze-thaw cycles.
Significance and Future Directions
This study is an important advancement in creating a standardized, consistent, and efficient method of tendon decellularization.
The method proved promising for bringing commercialized graft-based tendon restoration closer to adherence with Good Manufacturing Practices (GMP), which is crucial for quality control in producing clinically-approved materials.
Looking forward, automating key procedural steps—like the freeze-thaw cycles used here—will be integral to developing manufacturing processes that meet GMP standards; this study makes a significant contribution to that goal.
Cite This Article
APA
Roth SP, Glauche SM, Plenge A, Erbe I, Heller S, Burk J.
(2017).
Automated freeze-thaw cycles for decellularization of tendon tissue – a pilot study.
BMC Biotechnol, 17(1), 13.
https://doi.org/10.1186/s12896-017-0329-6
Large Animal Clinic for Surgery, University of Leipzig, An den Tierkliniken 21, Leipzig, 04103, Germany. susanne.roth@uni-leipzig.de.
Saxonian Incubator for Clinical Translation, University of Leipzig, Philipp-Rosenthal-Strasse 55, Leipzig, 04103, Germany. susanne.roth@uni-leipzig.de.
Glauche, Sina Marie
Saxonian Incubator for Clinical Translation, University of Leipzig, Philipp-Rosenthal-Strasse 55, Leipzig, 04103, Germany.
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