title: SHIP1 is targeted by miR-155 in acute myeloid leukemia.
abstract: The SH2 domain-containing inositol 5'-phosphatase 1 (SHIP1) has been implicated as a suppressor of hematopoietic transformation as its activity can inhibit the PI3K/Akt signaling pathway. Reduced activity of SHIP1 has been observed in acute myeloid leukemia (AML). SHIP1 is a target of microRNA-155 (miR-155). Therefore, the aim of the present study was to investigate the role of miR-155/SHIP1 in the pathogenesis of AML. We examined the levels of SHIP1 protein and miR-155 in tissue samples of patients with AML and in AML cell lines. In addition, we investigated cell proliferation, apoptosis and expression of SHIP1/PI3K/AKT pathway molecules in the THP-1 and U937 cell lines after miR-155 inhibitor or mimics were transfected. We showed that the levels of SHIP1 protein were significantly decreased in tissue samples of patients with some subtypes of AML (M4 or M5) and in AML cell lines with concomitant overexpression of miR-155. In addition, we demonstrated that decreased expression of SHIP1 in the AML cell lines was a consequence of increased levels of miR-155 and can therefore be reversed in vitro through inhibition of miR-155, with subsequent inhibition of cell proliferation and promotion of cell apoptosis. In conclusion, expression of the SHIP1 protein is targeted by miR-155 in AML. miR-155 acts as an onco-miR, and the miR-155/SHIP1/PI3K/AKT signaling pathway could play an important role in the pathogenesis of AML.
authors.affiliation: Department of Hematology, The Second Hospital of Hebei Medical University, Shijiazhuang, Hebei 050000, P.R. China.
authors.forename: Hua
authors.initials: H
authors.lastname: Xue
authors.affiliation: Department of Hematology, Affiliated Hospital of Hebei University, Baoding, Hebei 071000, P.R. China.
authors.forename: Luo-Ming
authors.initials: LM
authors.lastname: Hua
authors.affiliation: Department of Hematology, Affiliated Hospital of Hebei University, Baoding, Hebei 071000, P.R. China.
authors.forename: Ming
authors.initials: M
authors.lastname: Guo
authors.affiliation: Department of Hematology, The Second Hospital of Hebei Medical University, Shijiazhuang, Hebei 050000, P.R. China.
authors.forename: Jian-Min
authors.initials: JM
authors.lastname: Luo
mesh_terms: D017209:Apoptosis; D045744:Cell Line, Tumor; D049109:Cell Proliferation; D015972:Gene Expression Regulation, Neoplastic; D006801:Humans; D000072181:Inositol Polyphosphate 5-Phosphatases; D015470:Leukemia, Myeloid, Acute / Q000235:genetics* / Q000378:metabolism* / Q000473:pathology; D020935:MAP Kinase Signaling System; D035683:MicroRNAs / Q000378:metabolism*; D000072183:Phosphatidylinositol-3,4,5-Trisphosphate 5-Phosphatases; D010744:Phosphoric Monoester Hydrolases / Q000037:antagonists & inhibitors / Q000235:genetics*; D034741:RNA, Small Interfering / Q000494:pharmacology
chemical_list: C524942:MIRN155 microRNA, human; D035683:MicroRNAs; D034741:RNA, Small Interfering; D010744:Phosphoric Monoester Hydrolases; D000072181:Inositol Polyphosphate 5-Phosphatases; C000606430:INPP5D protein, human; D000072183:Phosphatidylinositol-3,4,5-Trisphosphate 5-Phosphatases