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Published on: October 14, 2016
[Expression of CXCR7 in Acute Monocytic Leukemia and Its Effects on THP-1 Cell Functions]
Yan Hu1, Jing Li1, Li-Hong Wang1
1Department of Hematology, The First Affiliated Hospital of Anhui Medical University, Hefei 230022, Anhui Province, China.
Objective:
To study the expression of stromal cell derived factor-1α (SDF-1α) receptor CXCR7 in acute monocytic leukemia (AML-M5), and its effects on proliferation, apoptosis, invasion of acute monocytic leukemia cell line THP-1.
Methods:
CXCR7 protein and mRNA expression levels in THP-1 cells and peripheral blood mononuclear cells (PBMNC) from the newly diagnosed AML-M5 patients and normal individuals were detected by flow cytometry, Western blot and RT-PCR respectively. CCK8, Annexin V/PI double staining and Transwell assay were used to observe the effects of CXCR7 on the proliferation, apoptosis, and invasion of THP-1 cells in vitro.
Results:
The expression of CXCR7 on immature cell surface of the newly diagnosed AML-M5 patients was significantly higher than that in the control group (P<0.05). CXCR7 was also highly expressed on THP-1 cells surface. The CXCR7 protein and mRNA levels in THP-1 cells and PBMNC of AML-M5 patients were significantly higher than those in the control group (P<0.05). The THP-1 cell proliferation activity was higher in SDF-1α-treated group, but this activity could be inhibited by CXCR7 antibody (P<0.01). CXCR7 antibody did not affect THP-1 cell apoptosis (P>0.05). CXCR7 antibody could inhibit SDF-1α -induced THP-1 cell invasiveness (P<0.01).
Conclusion:
CXCR7 highly expresses in AML-M5 patients and THP-1 cells, and involves in cell proliferation and invasion. The blocking CXCR7 expression can reduce the risk of AML-M5 cell infiltration.
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