Circ_0005615 enhances multiple myeloma progression through interaction with EIF4A3 to regulate MAP3K4 m6A modification mediated by ALKBH5

Apr 25, 2024Leukemia research

Circular RNA Circ_0005615 may promote multiple myeloma by working with EIF4A3 to control m6A modification of MAP3K4 through ALKBH5

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Abstract

Circ_0005615 was found to be upregulated in multiple myeloma (MM).

Overexpression of circ_0005615 may promote cell viability and invasion while suppressing apoptosis in MM cells.
Knockdown of circ_0005615 appears to reverse its effects on cell survival and invasion.
Circ_0005615 is associated with an interaction module involving EIF4A3, ALKBH5, and MAP3K4.
Increased circ_0005615 levels may lead to higher m6A methylation of MAP3K4 by inhibiting ALKBH5.
Overexpression of ALKBH5 could diminish the effects of circ_0005615 on MAP3K4 methylation and tumor progression.
The proposed mechanisms and functions of circ_0005615 have been confirmed through in vivo experiments.

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BACKGROUND: Circular RNAs (circRNAs) are associated with development and progression of multiple myeloma (MM). However, the role and mechanism of circ_0005615 in MM have not been elucidated.

METHODS: Circ_0005615 was determined by GEO database. quantitative RT-PCR was performed to confirm the expression of circ_0005615 in peripheral blood of MM patients and MM cells. The roles of circ_0005615 in MM were analyzed using CCK8, transwell invasion, cell apoptosis and tumor xenograft experiments. Bioinformatics tools, RIP and RNA pull down assays were conducted to explore the downstream of circ_0005615. Furthermore, the mechanism was investigated by quantitative RT-PCR, western blot, dot blot and meRIP-PCR assays.

RESULTS: Circ_0005615 was upregulated in MM. Overexpression of circ_0005615 promoted cell viability and invasion, and suppressed apoptosis in vitro, which were opposite when circ_0005615 was knockdowned. Mechanistically, EIF4A3, a RNA-binding protein (RBP), could directly bind to circ_0005615 and ALKBH5, where ALKBH5 could directly combine with MAP3K4, forming a circ_0005615- EIF4A3-ALKBH5-MAP3K4 module. Furthermore, circ_0005615 overexpression increased m6A methylation of MAP3K4 by inhibiting ALKBH5, leading to decreased MAP3K4. Further functional experiments indicated that ALKBH5 overexpression weakened the promoting roles of circ_0005615 overexpression in MAP3K4 m6A methylation and tumor progression in MM. The above functions and mechanism were also verified in vivo.

CONCLUSIONS: Elevated circ_0005615 decreased MAP3K4 mediated by ALKBH5 through interacting with EIF4A3, thereby accelerating MM progression. Circ_0005615 might be a promising biomarker and target of MM.

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Circ_0005615 enhances multiple myeloma progression through interaction with EIF4A3 to regulate MAP3K4 m6A modification mediated by ALKBH5

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