The aim of the present work was to determine proliferation capacity, immunophenotype and genome integrity of mesenchymal stromal cells (MSCs) from horse umbilical cord blood (UCB) at passage stage 5 and 10. Passage 4 cryopreserved UCB-MSCs from six unrelated donors were evaluated. Immunophenotypic analysis of UCB-MSC revealed a cell identity consistent with equine MSC phenotype by high expression of CD90, CD44, CD29, and very low expression of CD4, CD11a/18, CD73, and MHC class I and II antigens. Proliferative differences were noted among the UCB-MSC cultures. UCB-MSCs karyotype characteristics at passage 5 (eg, 2n = 64; XY, or XX) included 20% polyploidy and 62% aneuploidy. At passage 10, the proportion of polyploidy and aneuploidy was 21% and 82%, respectively, with the increase in aneuploidy being significant compared with passage 5. Furthermore, conventional GTG-banded karyotyping revealed several structural chromosome abnormalities at both passage 5 and 10. The clinical relevance of such chromosome instability is unknown, but determination of MSC cytogenetic status and monitoring of patient response to MSC therapies would help address this question.
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