Premium
Freezing of dendritic cells with trehalose as an additive in the conventional freezing medium results in improved recovery after cryopreservation
Author(s) -
Shinde Prajakta,
Khan Nikhat,
Melinkeri Sameer,
Kale Vaijayanti,
Limaye Lalita
Publication year - 2019
Publication title -
transfusion
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.045
H-Index - 132
eISSN - 1537-2995
pISSN - 0041-1132
DOI - 10.1111/trf.15028
Subject(s) - cryopreservation , trehalose , dimethyl sulfoxide , andrology , viability assay , fetal bovine serum , liquid nitrogen , biology , chemistry , microbiology and biotechnology , in vitro , medicine , biochemistry , embryo , organic chemistry
BACKGROUND Dendritic cell (DC) vaccination involves administration of multiple doses. Cryopreservation of tumor antigen–pulsed DCs can provide a ready to use vaccine source and eliminate the need of frequent withdrawal of the patient's blood for vaccine preparation. The aim of this study was to assess the effect of addition of trehalose in the freezing medium on the recovery of DCs after cryopreservation. STUDY DESIGN AND METHODS DCs were generated from mononuclear cells from apheresis samples of healthy donors. For long‐term storage of 6 months, cells were frozen with a rate‐controlled programmable freezer and stored in liquid nitrogen. For short‐term storage of 1 month, cells were frozen and stored at −80°C. DCs frozen with Iscove's Modified Dulbecco's Medium + 10% dimethyl sulfoxide + 20% fetal bovine serum served as the control group, while the test group was additionally supplemented with 50 μg/mL of trehalose. After revival of control and test DCs, they were assessed for viability, morphology, phenotype, and functions. RESULTS The addition of trehalose to the conventional freezing medium helped to preserve the viability and functionality of DCs better than dimethyl sulfoxide alone in both long‐ and short‐term cryopreservation. Trehalose also protected the mitochondrial membrane potential and cytoskeleton integrity of DCs, which are necessary for their functionality. Mediators of the intrinsic apoptotic pathway like Caspase‐9 and Bim‐1 were found to be low in the test. CONCLUSION Supplementation of conventional freezing medium with trehalose results in better quality of DCs revived after cryopreservation. This finding could help improve DC vaccine preparation for cancer immunotherapy.