Cryopreserved or Fresh Mesenchymal Stromal Cells: Only a Matter of Taste or Key to Unleash the Full Clinical Potential of MSC Therapy?
Abstract
Mesenchymal stromal cells (MSCs) harbor great therapeutic potential for numerous diseases. From early clinical trials, success and failure analysis, bench-to-bedside and back-to-bench approaches, there has been a great gain in knowledge, still leaving a number of questions to be answered regarding optimal manufacturing and quality of MSCs for clinical application. For treatment of many acute indications, cryobanking may remain a prerequisite, but great uncertainty exists considering the therapeutic value of freshly thawed (thawed) and continuously cultured (fresh) MSCs. The field has seen an explosion of new literature lately, outlining the relevance of the topic. MSCs appear to have compromised immunomodulatory activity directly after thawing for clinical application. This may provide a possible explanation for failure of early clinical trials. It is not clear if and how quickly MSCs recover their full therapeutic activity, and if the “cryo stun effect” is relevant for clinical success. Here, we will share our latest insights into the relevance of these observations for clinical practice that will be discussed in the context of the published literature. We argue that the differences of fresh and thawed MSCs are limited but significant. A key issue in evaluating potency differences is the time point of analysis after thawing. To date, prospective double-blinded randomized clinical studies to evaluate potency of both products are lacking, although recent progress was made with preclinical assessment. We suggest refocusing therapeutic MSC development on potency and safety assays with close resemblance of the clinical reality.
Keywords
Mesenchymal stromal cell Cell therapy Cryopreservation Freeze-thawing Freeze injury Cell engraftment Cryopreservation-induced cell death T cells Complement CoagulationAbbreviations
- AT
Adipose tissue
- ATMP
Advanced therapy medicinal product
- BM
Bone marrow
- CD3
Cluster of differentiation 3
- CPA
Cryoprotective agent
- DMSO
Dimethyl sulfoxide
- FCS
Fetal calf serum
- GvHD
Graft-versus-host disease
- IBMIR
Instant blood-mediated inflammatory reaction
- IFNg
Interferon gamma
- IL1a
Interleukin 1 alpha
- ISCT
International Society for Cellular Therapy
- LN2
Liquid nitrogen
- MOA
Mechanism of action
- MSC
Mesenchymal stromal cell
- NK cell
Natural killer cell
- PBMC
Peripheral blood mononuclear cell
- RNA
Ribonucleic acid
- T1D
Type 1 diabetes
- TNFa
Tumor necrosis factor alpha
- UC
Umbilical cord
Notes
Acknowledgements
Guido Moll’s contributions were made possible by German Research Foundation (DFG) funding through the Berlin-Brandenburg School for Regenerative Therapies (BSRT, GSC203); Sven Geißler was supported by grants from the Berlin-Brandenburg Center for Regenerative Therapies (BCRT), the German Federal Ministry of Education and Research (BMBF, Fkz: 01EC1402B), and the DFG (GE2512/1-2); Lech Ignatowicz was supported by the Swedish Research Council (project 2012-1883); Olle Ringdén was supported by grants from the Swedish Research Council (K2014-64X-05971-34-4), the Swedish Cancer Society (CAN2013/671), the Children’s Cancer Foundation (PR2013-0045), the Cancer Society in Stockholm (111293), and Karolinska Institutet.
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