Masoomeh Masoomikarimi ۱ - ۱ School of Medicine, Torbat Heydariyeh University of Medical Sciences, Torbat Heydariyeh, Iran.
Raziyeh Alipour ۲ - ۲ Dept. of Immunology, School of Medicine, Isfahan University of Medical Science, Isfahan, Iran.
Minu Adib ۲
Reza Ahmadi ۳ - ۳ Biochemistry Center, Sahrekord University of Medical Science, Sahrekord, Iran.
Moslem Jafarisani ۴* - ۴ School of Medicine, Shahroud University of Medical Science, Shahroud, Iran.
Agheel Tabar Mollahassan ۵ - ۵ Dept. of Immunology, School of Medical Science, Islamic Azad University Babol Branch, Babol, Iran.

Background: Mesenchymal Stem Cells (MSC) have ability to regulate immune response via proinflamatory cytokines. In this study we aimed to investigate the effect of different mechanism for T cell activation and adjacency on immunoregulatory properties of MSC.Methods: Bone marrow MSCs were purchased and T cells were obtained from whole blood sample. T cells were activated by two different mechanisms using Peripheral Blood Mononuclear Cell (PBMC) and phytohemagglutinin (PHA) and then co-cultured with MSC using transwell cultures (Indirect contact) and usual plate (Direct contact). After ۹۶ hours TGF-b concentration in culture medium and indole amine ۲, ۳-dioxygenase (IDO) activity in cell lysate were assayed. We used ANOVA and T-test for statistical analysis and ۰.۰۵ was considered as significant level.Results: Our result showed a significant increase of TGF-b secretion and IDO activity. Increase in mixed lymphocyte culture (MLC) groups was more significant than lymphocyte transformation test (LTT) in compare with control.Conclusions: The present study confirmed immunoregulatory effect of BM-MSC. Also this study showed that MLC of BM-MSCs and T cells have more immunoregulatory effects than LTT.Background: Mesenchymal Stem Cells (MSC) have ability to regulate immune response via proinflamatory cytokines. In this study we aimed to investigate the effect of different mechanism for T cell activation and adjacency on immunoregulatory properties of MSC. Methods: Bone marrow MSCs were purchased and T cells were obtained from whole blood sample. T cells were activated by two different mechanisms using Peripheral Blood Mononuclear Cell (PBMC) and phytohemagglutinin (PHA) and then co-cultured with MSC using transwell cultures (Indirect contact) and usual plate (Direct contact). After ۹۶ hours TGF-b concentration in culture medium and indole amine ۲, ۳-dioxygenase (IDO) activity in cell lysate were assayed. We used ANOVA and T-test for statistical analysis and ۰.۰۵ was considered as significant level. Results: Our result showed a significant increase of TGF-b secretion and IDO activity. Increase in mixed lymphocyte culture (MLC) groups was more significant than lymphocyte transformation test (LTT) in compare with control. Conclusions: The present study confirmed immunoregulatory effect of BM-MSC. Also this study showed that MLC of BM-MSCs and T cells have more immunoregulatory effects than LTT.

Mesenchymal stem cell, T cells, Immunoregulatory, TGF-b, IDO