title: Phenotypic and Cytogenetic Characterization of Mesenchymal Stromal Cells inDe NovoMyelodysplastic Syndromes.
abstract: Bone marrow (BM) mesenchymal stem/stromal cells (MSCs) are vital in hematopoiesis. Whether BM-MSCs alter their characteristics in Myelodysplastic Syndromes (MDS) is still controversial. We characterized MSCs ofde novoMDS patients in Sri Lanka who have not been reported previously in the literature. We also analyzed MSCs derived from different MDS subtypes. MSCs were culture-expanded, characterized by flow cytometry, and induced towards osteogenic and adipogenic differentiation. Growth properties were determined using growth curves and population doubling times. Karyotyping and FISH were performed on MSCs. Cell morphology, differentiation potential, and CD marker expression of MDS-MSCs of all subtypes were comparable to those of control-MSCs. No significant growth differences were observed between control MSCs and MDS-MSCs of all subtypes (p> 0.05). 31% of MDS-MSCs had chromosomal aberrations (der(3),del(6q),del(7p), loss of chromosomes) whose BM karyotypes were normal. Highest percentage of karyotypic abnormalities was observed in RCMD-MSCs. Patients with abnormal BM karyotypes had no aberrant MSC clones. Results show that in spite of presence of genetically abnormal clones in MDS-MSC populations,in vitrophenotypic and growth characteristics of MSCs in MDS remain unchanged. Further, the occurrence of genetic abnormalities in BM-MSCs in MDS could be considered as an autonomous event from that of their hematopoietic counterparts.
authors.affiliation: Human Genetics Unit, Faculty of Medicine, University of Colombo, 00800 Colombo, Sri Lanka; Department of Pre-Clinical Sciences, Faculty of Medicine, General Sir John Kotelawala Defence University, Ratmalana, Sri Lanka.
authors.forename: A J I S
authors.identifier: 0000-0002-9860-1415
authors.initials: AJ
authors.lastname: Rathnayake
authors.affiliation: Human Genetics Unit, Faculty of Medicine, University of Colombo, 00800 Colombo, Sri Lanka.
authors.forename: H W W
authors.initials: HW
authors.lastname: Goonasekera
authors.affiliation: Human Genetics Unit, Faculty of Medicine, University of Colombo, 00800 Colombo, Sri Lanka.
authors.forename: V H W
authors.identifier: 0000-0002-3264-6856
authors.initials: VH
authors.lastname: Dissanayake