الفهرس 
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Abstract
Introduction: The ideal stem cell for use in functional tissue engineering needs to be abundantly available, harvested with minimal morbidity, differentiated reliably down various pathways and able to be transplanted safely and efficaciously. Adult human adipose tissue-derived stem cells’ (hAMSCs), seems to fulfil most, if not all, of these criteria. In this work, we investigated the immunogenicity properties of human adipose-derived mesenchymal stem cells (HAMSCs) and their effect on monocytes differentiation.
Materials and methods: The hAMSCs have been isolated and specified (immunophenotypic analysis). Human peripheral blood mononuclear cells (PBMCs) were isolated and passed through a column with magnetic beads coated with anti-CD14 antibody. CD14+ ve cells were isolated and cultured independently or co-cultured with hAMSCs in the presence of cytokines (IL-4, Granulocyte-macrophage colony-stimulating factor (GM-CSF)) to induce their differentiation into dendritic cells (DCs). Their further maturation was induced by LPS added on the 6th day of culture. In day ten, supernatants were collected and studied by enzyme-linked immunosorbent assay (ELISA) and cells were collected for flow cytometry analysis of CD14 and HLA-DR class II.
Results: The major part of the independently cultured cells (CD14+ ve) was found to express the markers which are considered to be specific for the mature dendritic cells such as Human leukocyte antigen-DR (HLA-DR) (40.44 %) and low percentage of cells (6.9 %). Nevertheless dendritic cells of monocyte origin (mDCs) co-cultured with hAMSCs showed significant shifts in the pattern of surface markers. The percentage of HLA-DR cells was much lower (6.44%) compared to control cultures (p < 0.001). Similarly, the secretion of IL-10 by DCs was up-regulated in co-cultures of hAMSCs and DCs.
Conclusion: The results show that human adipose-tissue mesenchymal stem cells (hAMSCs) could inhibit the differentiation of the blood monocytes into dendritic cells. These findings together with the easier isolation of hAMSCs are supposed to make them preferred means for immunomodulatory agents for clinical applications and for investigating novel treatments for a vast array of inherited and acquired diseases.