Neda Rassaei - Department of Hematology, Faculty of Medical Sciences, Tarbiat Modares University,Tehran, Iran
Mahnoosh Abbaszade Dibavar - Department of Hematology and Blood Banking, School of Allied Medical Sciences, Shahid Beheshti University of Medical Sciences, Tehran, Iran
Masoud Soleimani - Department of Hematology, Faculty of Medical Sciences, Tarbiat Modares University,Tehran, Iran
Amir Atashi - Stem Cell and Tissue Engineering Research Center, Shahroud University of Medical Sciences, Shahroud, Iran
Mohammad Hossein Mohammadi - HSCT Research Center, Laboratory Hematology and Blood Banking Department, School of Allied Medical Sciences, Shahid Beheshti University of Medical Sciences, Tehran, Iran
Mehdi Allahbakhshian Farsani - Department of Hematology and Blood Banking, School of Allied Medical Sciences, Shahid Beheshti University of Medical Sciences, Tehran, Iran
Shaghayegh Shahsavan - HSCT Research Center, Shahid Beheshti University of Medical Sciences, Tehran, Iran

Objective(s): Microvesicles (MVs) are small membrane-bound particles that act as a vehicle to transfer their contents, such as proteins, RNAs, and miRNAs, to the target cells, making them undergo several changes. Depending on the origin and the target cell, MVs may cause cell survival or apoptosis. This study investigated the effects of MVs released from the leukemic K۵۶۲ cell line on the human bone marrow mesenchymal stem cells (hBM-MSCs) to evaluate changes in the survival or apoptosis of the cells in an in vitro system.  Materials and Methods: In this experimental study, we added the isolated MVs from the K۵۶۲ cell line to hBM-MSCs, and after three and then seven days, subsequently cell count, cell viability, transmission electron microscopy, tracing MVs by carboxyfluorescein diacetate, succinimidyl ester (CFSE) solution, flow cytometry analysis for Annexin-V/PI staining and qPCR for the evaluation of BCL-۲, KI۶۷, and BAX expression were carried out. On the ۱۰th day of the culture, hBM-MSCs were examined by Oil red O and Alizarin Red staining to evaluate their differentiation into adipocytes and osteoblasts.Results: There was a significant decrease in cell viability and KI۶۷ and BCL-۲ expression; however, BAX was significantly upregulated in the hBM-MSCs compared to control groups. Annexin-V/PI staining results also showed the apoptotic effects of K۵۶۲-MVs on hBM-MSCs. Moreover, the differentiation of hBM-MSCs into adipocytes and osteoblasts was not observed. Conclusion: MVs from the leukemic cell line could affect the viability of normal hBM-MSCs and induce cell apoptosis.

Apoptosis, K۵۶۲ cell line, Mesenchymal stem cell, Microvesicles, Survival