Catalase incorporation in freezing mixture leads to improved recovery of cryopreserved iPSC lines


Among the various types of stem cells, induced pluripotent stem cells (iPSCs) have gained much attention due to their pluripotent nature. iPSCs help us to understand the processes that regulate pluripotency and specialization. However, in order to use them in various applications in regenerative medicine, their efficient cryopreservation and recovery after the freezing injury is critical. Here we have used an antioxidant catalase, as an additive to the conventional freezing mixture containing 50% FBS and 10% DMSO. The hiPSCs were frozen as aggregates by using a programmable freezer and then stored in liquid nitrogen at -196 °C. It was seen that catalase improved the revival efficiency by reducing the late apoptotic populations and increasing the live cell fraction. Catalase also retained the pluripotent nature of iPSCs in a better way post revival. This improvement could be attributed to reduction of total ROS and apoptosis, which are the two main factors that cause damage during freezing. Our data suggest that catalase could be a useful additive while freezing hiPSCs. Copyright © 2019 Elsevier Inc. All rights reserved.

Authors Fernandes S, Khan N, Kale V, Limaye L
Journal Cryobiology
Publication Date 2019 Oct;90:21-29
PubMed 31494090
DOI 10.1016/j.cryobiol.2019.09.003

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