Many studies have reported that miR-302-367 cluster acts in different ways in various cell types. For instance, this cluster is shown to have a potential role in stemness regulation in embryonic stem cells (ESCs). On the other hand, this cluster inhibits the tumorigenicity of human pluripotent stem cells by coordinated suppression of CDK2 and CDK4/6 cell cycle pathways. Indeed, this cluster has a significant posttranscriptional impact on cell cycle progression. Previous reports have shown the participation of miR-302-367 cluster in cell cycle regulation of hESCs, MCF7, HepG2, and Teta-2 embryonal teratocarcinoma cells, but its effect on unrestricted somatic stem cells (USSCs) as a new source of human somatic stem cells from the umbilical cord blood remains to be elucidated. Therefore, in this study, we aimed to investigate the effect of miR-302-367 cluster on cell proliferation by MTT assay, cell cycle analysis, and colony formation assay. In addition, the expression of candidate cell cycle regulatory performance and tumor suppressor genes was determined. In this study, for the first time, we found that miR-302-367 cluster not only did not reprogram human USSCs into a pluripotent ESC-like state, but also inhibited the proliferation of human USSCs. Moreover, analyzing the cell cycle curve revealed a significant apoptotic phase upon viral introduction of miR-302-367. Our gene expression study revealed the overexpression of candidate genes after transduction of USSCs with miR-302-367 cluster. In conclusion, the controversial role of miR-302-367 in different cell types may provide better understanding for its role in stemness level and its antitumorigenicity potential in different contexts.
miR-302-367 Tumor suppressor USSCs
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This work was supported by a grant from the Stem Cell Technology Research Center, Tehran, Iran. The authors thank the members of their own laboratories for their helpful discussions. We are also grateful to Miss Ladan Langroudi for helping in the preparation of this manuscript.
Trompeter H-I et al. MicroRNAs MiR-17, MiR-20a, and MiR-106b act in concert to modulate E2F activity on cell cycle arrest during neuronal lineage differentiation of USSC. PLoS One. 2011;6(1):e16138.PubMedCentralCrossRefPubMedGoogle Scholar
Barroso-del Jesus A, Lucena-Aguilar G, Menendez P. The miR-302-367 cluster as a potential stemness regulator in ESCs. Cell Cycle. 2009;8(3):394–8.CrossRefPubMedGoogle Scholar
Johnnidis JB et al. Regulation of progenitor cell proliferation and granulocyte function by microRNA-223. Nature. 2008;451(7182):1125–9.CrossRefPubMedGoogle Scholar
Kaspi H et al. miR-290-295 regulate embryonic stem cell differentiation propensities by repressing Pax6. Stem Cells. 2013;31(10):2266–72.CrossRefPubMedGoogle Scholar
Rahimian A et al. Bypassing the maturation arrest in myeloid cell line U937 by over-expression of microRNA-424. Hematology. 2011;16(5):298–302.CrossRefPubMedGoogle Scholar
Fallah P, et al. miR-146a and miR-150 promote the differentiation of CD133+ cells into T-lymphoid lineage. Mol Biol Rep. 2013: p. 1–7.Google Scholar
Cai N, Wang Y-D, Zheng P-S. The microRNA-302-367 cluster suppresses the proliferation of cervical carcinoma cells through the novel target AKT1. RNA. 2013;19(1):85–95.PubMedCentralCrossRefPubMedGoogle Scholar
Lin S-L et al. MicroRNA miR-302 inhibits the tumorigenecity of human pluripotent stem cells by coordinate suppression of the CDK2 and CDK4/6 cell cycle pathways. Cancer Res. 2010;70(22):9473–82.CrossRefPubMedGoogle Scholar
Kögler G, Sensken S, Wernet P. Comparative generation and characterization of pluripotent unrestricted somatic stem cells with mesenchymal stem cells from human cord blood. Exp Hematol. 2006;34(11):1589–95.CrossRefPubMedGoogle Scholar
Adegani FJ. et al. A comparison of pluripotency and differentiation status of four mesenchymal adult stem cells. Mol Biol Rep. 2012: p. 1–11.Google Scholar
Kluth SM, Radke TF, Kogler G. Potential application of cord blood-derived stromal cells in cellular therapy and regenerative medicine. J Blood Transfus. 2012. 2012.Google Scholar
Jalali H et al. Unrestricted somatic stem cells as vehicle for nerve growth factor gene transfer. Neurol Res. 2013;35(6):553–60.CrossRefPubMedGoogle Scholar
Cho WJ et al. miR-372 regulates cell cycle and apoptosis of ags human gastric cancer cell line through direct regulation of LATS2. Mol Cells. 2009;28(6):521–7.CrossRefPubMedGoogle Scholar
Lin, S.-L, Wu DT. Production and utilization of a novel anti-cancer drug in therapy. 2013, US Patent App. 13/964,705.Google Scholar
Fareh M et al. The miR 302-367 cluster drastically affects self-renewal and infiltration properties of glioma-initiating cells through CXCR4 repression and consequent disruption of the SHH-GLI-NANOG network. Cell Death Differ. 2011;19(2):232–44.PubMedCentralCrossRefPubMedGoogle Scholar