[Expression and Function of circ_0073585 in Acute Myeloid Leukemia]

To investigate the expression level, clinical significance and function of circular RNAs (circRNAs) circ_0073585 in the bone marrow of patients with acute myeloid leukemia (AML).

The expression levels of circ_0073585 in bone marrow samples of 106 newly diagnosed AML patients and 38 controls were detected by real-time quantitative PCR (RQ-PCR). The differences were compared between the two groups and their clinical significance was analyzed. The diagnostic value of circ_0073585 expression for AML was evaluated by receiver operating characteristic curve(ROC). THP-1 cells with lentivirus overexpressing circ_0073585 vector and empty vector were divided into two groups: circ_0073585-THP-1 and NC-THP-1 group. CCK-8 assay and flow cytometry were used to study the effects of circ_0073585 on THP-1 cell proliferation, survival, apoptosis and drug sensitivity.

Compared with the controls, the expression level of circ_0073585 in the bone marrow of AML patients was significantly reduced (P < 0.001). There was a statistically significant difference between the high and low expression groups of circ_0073585 in the white blood cell count, platelet count (P < 0.01) and chromosome risk (P < 0.05). Compared with NC-THP-1 cells, the proliferation and viability of circ_0073585-THP-1 cells were weakened (P < 0.01), the apoptosis rate was increased (P < 0.01), and the sensitivity to homoharringtonine (P < 0.05) and daunorubicin hydrochloride (P < 0.001) was increased.

The expression level of circ_0073585 is decreased in AML patients. Overexpression of circ_0073585 can inhibit the proliferation and viability of leukemic cells, promote apoptosis, and increase sensitivity of leukemia cells to chemotherapy drugs.