Novel cryopreservation method for dissociated human embryonic stem cells in the presence of a ROCK inhibitor

Human Reproduction
Raquel Martín-IbáñezOuti Hovatta

Abstract

Human embryonic stem cells (hESCs) have potential use in clinical therapy and regenerative medicine. One of the major challenges regarding the application of these cells is the development of an efficient cryopreservation protocol, since current methods, which include slow-freezing-rapid thawing and vitrification of colonies in suspension, present poor viability and high differentiation rates. Dissociated hESC suspensions do not survive cryopreservation because they are susceptible to apoptosis upon cell detachment and dissociation. A selective Rho-associated kinase (ROCK) inhibitor has been reported to increase the survival of dissociated hESCs and their cloning efficiency. Here, we describe a novel method for dissociated hESCs cryopreservation in the presence of the ROCK inhibitor Y-27632. The addition of this inhibitor to the freezing and post-thawing medium significantly increased the survival rate and efficiency of colony formation. Moreover, the hESC colonies obtained after the cryopreservation in the presence of the ROCK inhibitor showed a very low rate of differentiation and a reduced time of recovery. After prolonged culture of frozen-thawed dissociated hESCs, the characteristic properties of pluripotent cells were obs...Continue Reading

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