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Cryopreservation of umbilical cord blood: 2. Tolerance of CD34(+) cells to multimolar dimethyl sulphoxide and the effect of cooling rate on recovery after freezing and thawing.

Abstract：

:Cryopreservation protocols for umbilical cord blood have been based on methods established for bone marrow (BM) and peripheral blood stem cells (PBSC). The a priori assumption that these methods are optimal for progenitor cells from UCB has not been investigated systematically. Optimal cryopreservation protocols utilising penetrating cryoprotectants require that a number of major factors are controlled: osmotic damage during the addition and removal of the cryoprotectant; chemical toxicity of the cryoprotectant to the target cell and the interrelationship between cryoprotectant concentration and cooling rate. We have established addition and elution protocols that prevent osmotic damage and have used these to investigate the effect of multimolar concentrations of Me(2)SO on membrane integrity and functional recovery. We have investigated the effect of freezing and thawing over a range of cooling rates and cryoprotectant concentrations. CD34(+) cells tolerate up to 60 min exposure to 25% w/w (3.2M) Me(2)SO at +2 degrees C with no significant loss in clonogenic capacity. Exposure at +20 degrees C for a similar period of time induced significant damage. CD34(+) cells showed an optimal cooling range between 1 degrees C and 2.5 degrees C/min. At or above 1 degrees C/min, increasing the Me(2)SO concentration above 10% w/w provided little extra protection. At the lowest cooling rate tested (0.1 degrees C/min), increasing the Me(2)SO concentration had a statistically significant beneficial effect on functional recovery of progenitor cells. Our findings support the conclusion that optimal recovery of CD34(+) cells requires serial addition of Me(2)SO, slow cooling at rates between 1 degrees C and 2.5 degrees C/min and serial elution of the cryoprotectant after thawing. A concentration of 10% w/w Me(2)SO is optimal. At this concentration, equilibration temperature is unlikely to be of practical importance with regard to chemical toxicity.

journal_name

Cryobiology

journal_title

Cryobiology

authors

Hunt CJ,Armitage SE,Pegg DE

doi

10.1016/s0011-2240(02)00181-5

subject

Has Abstract

pub_date

2003-02-01 00:00:00

pages

76-87

issue

1

eissn

0011-2240

issn

1090-2392

pii

S0011224002001815

journal_volume

46

pub_type

杂志文章

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