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Cryopreservation of peripheral blood mononuclear cells using uncontrolled rate freezing

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Abstract

Peripheral blood mononuclear cells are widely used as source material for anticancer immunotherapies. The conventional cryopreservation method for peripheral blood mononuclear cells is time-consuming and expansive, which involves controlled rate freezing followed by storage in liquid nitrogen. Instead, the convenient uncontrolled rate freezing cryopreservation method had been reported successfully in peripheral blood hematopoietic stem cells and peripheral blood progenitor cells. Therefore, we hypothesized that uncontrolled rate freezing cooling method maybe also applied to peripheral blood mononuclear cells cryopreservation. In this study, we evaluated the performance of uncontrolled rate freezing and controlled rate freezing cooling methods through cell recovery rate, viability, differentiation potential into cytokine-induced killer cells and the cellular properties of the cultured cytokine-induced killer cells. The results showed similar post-thaw viability and recovery rate in both controlled rate freezing and uncontrolled rate freezing cryopreserved peripheral blood mononuclear cells. Importantly, the uncontrolled rate freezing cryopreserved peripheral blood mononuclear cells exhibited higher growth ratio and earlier cell clustering during ex-vivo cytokine-induced killer cell culture than the controlled rate freezing ones. These two groups of expanded cytokine-induced killer cells also exhibited similar effector cell subset ratio and tumoricidal activity. In general, the performance of cryopreserved peripheral blood mononuclear cells using uncontrolled rate freezing cooling method, with the commercial cryoprotective agent CellBanker 2, was equal or better than the controlled rate freezing method. Our study implied that the combined use of cryoprotective agent CellBanker 2 and uncontrolled rate freezing could be a convenient cryopreservation method for peripheral blood mononuclear cells.

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GZ proposed the experiments. XH, ML and XL provided supervision. All authors contributed to performed the experiments and collected the data. YH performed data analysis and wrote the first draft of the manuscript. YL and YR commented on previous versions of the manuscript. All authors read and approved the final manuscript.

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Correspondence to Muyun Liu.

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The authors declare that they have no conflict of interest.

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Guifang Zeng and Yue Hu: Co-first authors.

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Zeng, G., Hu, Y., Hu, X. et al. Cryopreservation of peripheral blood mononuclear cells using uncontrolled rate freezing. Cell Tissue Bank 21, 631–641 (2020). https://doi.org/10.1007/s10561-020-09857-w

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  • DOI: https://doi.org/10.1007/s10561-020-09857-w

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