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Biotin-based Pulldown Assay to Validate mRNA Targets of Cellular miRNAs
Published on: June 12, 2018
Identification of miR-125b targets involved in acute promyelocytic leukemia cell proliferation
Yikai Zhang1, Chengwu Zeng1, Shuai Lu2
1Institute of Hematology, Medical College, Jinan University, Guangzhou, 510632, China; Key Laboratory for Regenerative Medicine of Ministry of Education, Jinan University, Guangzhou, 510632, China; First Affiliated Hospital, Jinan University, Guangzhou 510632, China.
Abstract:
Acute promyelocytic leukemia (APL) is characterized by the presence of the PML-RARα fusion protein. We have previously found that PML-RARα-regulated miR-125b is highly expressed in APL; however, the characteristics of the regulatory effects and mechanisms of miR-125b involved in APL proliferation have yet to be clarified. In this study, we demonstrate that miR-125b promotes the proliferation of APL cells with the involvement of the PI3K/Akt and MAPK signaling pathways. Furthermore, we identified BTG2, MAP3K11, RPS6KA1 and PRDM1 as putative targets of miR-125b, which we verified using luciferase reporter constructs. Moreover, we demonstrate that the expression of miR-125b targets is downregulated in leukemic cells in patients with APL. Thus, our results provide evidence that miR-125b can modulate multiple oncogenic cell proliferation pathways and may be a novel therapeutic target for APL.
Insights
MicroRNA-125b (miR-125b) fuels acute promyelocytic leukemia (APL) cell growth by activating key signaling pathways. Targeting miR-125b may offer a new therapeutic strategy for APL patients.
Area of Science:
- Molecular Biology
- Oncology
- Gene Regulation
Background:
- Acute promyelocytic leukemia (APL) is defined by the PML-RARα fusion protein.
- PML-RARα regulates miR-125b, which is highly expressed in APL.
- The precise role of miR-125b in APL proliferation remains unclear.
Purpose of the Study:
- To investigate the role of miR-125b in APL cell proliferation.
- To elucidate the molecular mechanisms by which miR-125b influences APL.
- To identify potential therapeutic targets for APL.
Main Methods:
- Cell proliferation assays were used to assess the impact of miR-125b.
- Western blotting and luciferase reporter assays were employed to study signaling pathways and gene targets.
- Expression levels of miR-125b targets were analyzed in patient samples.
Main Results:
- miR-125b significantly promotes APL cell proliferation.
- This promotion involves the PI3K/Akt and MAPK signaling pathways.
- BTG2, MAP3K11, RPS6KA1, and PRDM1 were confirmed as direct targets of miR-125b.
- Expression of these targets is reduced in APL patient leukemic cells.
Conclusions:
- miR-125b drives APL cell proliferation through modulation of oncogenic signaling pathways.
- miR-125b and its downstream targets represent potential therapeutic avenues for APL.
- Understanding miR-125b's role provides insights into APL pathogenesis.
