Abstract：
:Hematopoietic stem cells (HSCs) from umbilical cord blood have been successfully used to treat blood disorders but one major hurdle is the relatively low cell dose available. Double cord blood unit transplantation results in elevated engraftment failure because one unit predominates over the other. Various approaches are thus being undertaken to expand HSCs ex vivo from single cord blood units. We report here a protocol involving slow freezing (-1 °C per minute to -120 °C) + freezing medium containing DMSO + FBS + 24 h-50% hWJSC-CM that enhances thaw-survival of CD34+ cells. Post-thawing, the fold, percentage and colony forming unit numbers of CD34+ cells were significantly increased (2.08 ± 0.3; 102 ± 1.17%; 1.07 ± 0.02 respectively) while the percentages of apoptotic, necrotic, dead and sub-G1 phase cells (91.06 ± 3.63%; 91.80 ± 5.01%; 95.6 ± 3.61 %; 86.1 ± 16.26% respectively) were significantly decreased compared to controls. Post-thaw culture in 24 h-50% hWJSC-CM+FBS for 72 h showed further significant increases in CD34+ cells (fold: 2.28 ± 0.17; percentage: 153.3 ± 21.99%, CFU: 1.6 ± 0.19) and significant decreases in apoptotic, necrotic, dead and sub-G1 cells (49.2 ± 3.59%; 62.0 ± 4.30%; 56.6 ± 5.06%; 28.6 ± 5.74 % respectively) compared to controls. We hypothesize that these improvements are probably related to the high levels of cytokines, cell adhesion molecules and growth factors in hWJSC-CM that help to preserve cell membrane integrity during freezing and stimulate mitosis post-thaw. A 24 h-50% hJWSC-CM may be a useful supplement for freezing CD34+ cells in cord blood banks.
journal_name
Stem Cell Rev Repjournal_title
Stem cell reviews and reportsauthors
Lin HD,Bongso A,Gauthaman K,Biswas A,Choolani M,Fong CYdoi
10.1007/s12015-013-9426-7subject
Has Abstractpub_date
2013-04-01 00:00:00pages
172-83issue
2eissn
2629-3269issn
2629-3277journal_volume
9pub_type
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