microRNA-22 can regulate expression of the long non-coding RNA MEG3 in acute myeloid leukemia

Aim: Acute myeloid leukemia (AML) is the most common blood tumor with poor prognosis. At present, the research found that the pathogenesis of AML is related to many factors, such as recurrent somatic mutations and gene expression and epigenetic changes, however, the molecular mechanism of AML is still unclear. Long non-coding RNA MEG3 is a newly found tumor suppressor and plays a very important role in the regulation of a variety of tumor formation and progression. Studies found that the MEG3 expression was significantly decreased in AML. However, to date, it is not clear the cause of its abnormal expression. Therefore, the molecular mechanism of AML is urgently needed to study the molecular mechanism of AML. Methods: The different expression level of MEG3, TET2, miR-22-3p, miR-22-5p in AML was detected by real-time quantification PCR. MEG3, TET2, miR-22-3p, miR-22-3p expression cell pools in K562 cells was used to interfering and TET2, MEG3 TET2, relations with miR-22-3p, miR-22-5p. The effect of AML cell on proliferation was evaluated by TET2 lower expression. Results: 1. The lower expression of MEG3 and TET2 in AML cell lines was detected by RT-qPCR. 2. The stable MEG3, TET2 overexpression cell pools in K562 cells was successful established. 3. After transfection, MTT assay revealed that cell growth was significantly increased in AML cell lines transfected with TET2 compared with controls. Conclusions: Our findings suggested that MEG3 is significantly down regulated in AML cell lines.