[Inhibitory effect of bone marrow mesenchymal stem cells on lymphoma cell proliferation]

Growing evidences show that mesenchymal stem cells (MSC) home to tumorgenesis and inhibit tumor cells, however, their molecular mechanisms are unclear. The purpose of this study was to explore the effect of B7-H4 in the influence of the mouse MSC on the proliferation of lymphoma cell line EL-4. The expression of B7-H4 on the MSC cell line C3H10T1/2 (C3H10) was detected by using immunofluorescence. FAM-siRNA was synthesized and transfected into C3H10 cells by INTERFER in (TM) siRNA Transfection Reagent. The transfection efficiency was determined by fluorescent microscopy and flow cytometry. The mRNA expression of B7-H4 was detected by RT-PCR after transfection of siRNA-B7-H4 into C3H10 cell line. The EL-4 was co-cultured with C3H10 siRNA-NC or C3H10 siRNA-B7-H4 for 48 hours, then was compared with EL-4 cultured alone, after 48 hours the cells were harvested under the confocal microscopy and measured by means of CCK-8 Kit. The results showed that the siRNA transfection efficiency in C3H10 cells reached to 72.43%, B7-H4 expressed highly on C3H10, the B7-H4 mRNA expression was down-regulated by transfection with different concentrations of siRNA into C3H10 cells. The proliferation of EL-4 was inhibited by C3H10 cells, and the effects were weakened and even disappeared after down-regulation of B7-H4. It is concluded that C3H10 can inhibit the proliferation of EL-4 through the expression of B7-H4, and this study provides new targets for the clinical treatment of lymphoma.