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Published on: July 21, 2018
PRRC2A-mediated m6A modification on NCOA4 promotes thymic epithelial tumor progression through PKM2-induced
Tao Wang1, Lang Xia1, Lei Zhang1
1Department of Thoracic Surgery, Shanghai Pulmonary Hospital, School of Medicine, Tongji University, Shanghai, China.
Abstract:
Thymic epithelial tumors (TETs) are heterogeneous neoplasms. While most early-stage cases are curable after resection, advanced or aggressive subtypes have limited treatment options and poor outcomes. The molecular mechanisms underlying their metabolic reprogramming remain poorly understood. Proline-rich Coiled-coil 2a (PRRC2A), a N6-methyladenosine (m6A) reader protein, is significantly upregulated in TET tissues and is associated with poor clinical outcomes. Multi-omics analyses and molecular experiments revealed that PRRC2A binds to m6A-modified sites within the NCOA4 mRNA, thereby stabilizing NCOA4 transcripts and enhancing its protein expression. Elevated NCOA4 interacts with PKM2, a rate-limiting glycolytic enzyme, resulting in increased glycolysis and promoting TETs progression. In vivo experiments showed that inhibition of PRRC2A suppressed tumor growth and metastasis in TETs, while combined treatment with the PKM2 inhibitor C599 and PRRC2A knockdown produced enhanced antitumor effects. These findings provide novel insights into the glycolytic metabolic regulation of TETs and suggest that the PRRC2A-NCOA4-PKM2 axis represents a promising therapeutic target.
Insights
Proline-rich Coiled-coil 2a (PRRC2A) protein promotes thymic epithelial tumor growth by stabilizing NCOA4 and increasing glycolysis. Inhibiting PRRC2A shows therapeutic potential for advanced thymic epithelial tumors.
Area of Science:
- Oncology
- Molecular Biology
- Metabolic Pathways
Background:
- Thymic epithelial tumors (TETs) present challenges in advanced stages due to limited treatment options and poor outcomes.
- The metabolic reprogramming in TETs is not well understood, hindering therapeutic development.
Purpose of the Study:
- To investigate the role of Proline-rich Coiled-coil 2a (PRRC2A), an m6A reader protein, in the metabolic regulation and progression of TETs.
- To identify potential therapeutic targets within the PRRC2A-mediated metabolic pathway.
Main Methods:
- Multi-omics analyses and molecular experiments were used to elucidate the function of PRRC2A in TETs.
- In vivo studies assessed the effects of PRRC2A inhibition and combined therapies on tumor growth and metastasis.
Main Results:
- PRRC2A is upregulated in TETs and linked to poor clinical outcomes.
- PRRC2A stabilizes NCOA4 mRNA, increasing NCOA4 protein expression, which enhances glycolysis via interaction with PKM2, thus promoting TET progression.
- Inhibition of PRRC2A suppressed tumor growth and metastasis; combined PRRC2A knockdown and PKM2 inhibition showed enhanced antitumor effects.
Conclusions:
- The PRRC2A-NCOA4-PKM2 axis is a key regulator of glycolytic metabolism in TETs.
- Targeting this axis, particularly PRRC2A, offers a promising therapeutic strategy for advanced or aggressive thymic epithelial tumors.
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