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Published on: March 17, 2023
Mitochondrial citrate transport represents a metabolic liability in MYCN-amplified neuroblastoma
Abstract:
MYCN amplification predicts poor prognosis and resistance to therapy in human neuroblastoma. However, pharmacological strategies that directly antagonize MYCN, the protein encoded by MYCN, remain unsuccessful. Oncogenic MYCN regulates many aspects of cellular metabolism, which in principle provides novel targets for development of effective cancer therapeutics. We herein identified the solute carrier family 25 member 1 (SLC25A1)-mediated mitochondrial citrate export as a metabolic vulnerability in MYCN-amplified neuroblastomas. The citrate efflux from mitochondria is essential for MYCN-amplified neuroblastoma cells to generate the necessary acetyl-CoA to support histone acetylation and subsequent transcriptional activation of the anti-apoptotic baculoviral IAP repeat containing 3 (BIRC3) gene. Meanwhile, elevated cytosolic acetyl-CoA sustains the acetylation of non-histone protein myeloid cell leukemia 1 (MCL1), which counteracts its protein degradation by the 26S proteasome. BIRC3 and MCL1 in turn cooperate to inhibit apoptosis in MYCN-amplified neuroblastoma cells. Inhibition of SLC25A1 preferentially induced potent apoptosis in MYCN-amplified neuroblastoma cells, and synergistically potentiated the therapeutic efficacies of BCL2 antagonists. These findings reveal SLC25A1 as an actionable MYCN-driven metabolic liability, and validate SLC25A1 inhibitors, alone or in combination with BCL2 antagonists, as potential effective therapeutics for MYCN-amplified neuroblastomas.
Insights
MYCN amplification in neuroblastoma drives cancer cell survival by regulating mitochondrial citrate export. Inhibiting Solute Carrier Family 25 Member 1 (SLC25A1) triggers apoptosis and enhances therapy, offering new treatment strategies.
Area of Science:
- Oncology
- Molecular Biology
- Metabolic Pathways
Background:
- MYCN amplification is a key driver of aggressive neuroblastoma, conferring poor prognosis and therapeutic resistance.
- Targeting MYCN directly has proven challenging, necessitating alternative therapeutic strategies.
- MYCN's influence on cellular metabolism presents potential vulnerabilities for drug development.
Purpose of the Study:
- To identify metabolic vulnerabilities in MYCN-amplified neuroblastomas.
- To investigate the role of mitochondrial citrate export in MYCN-driven neuroblastoma.
- To evaluate SLC25A1 as a therapeutic target for neuroblastoma.
Main Methods:
- Investigated Solute Carrier Family 25 Member 1 (SLC25A1) mediated mitochondrial citrate export.
- Analyzed the generation of Acetyl-CoA for histone and non-histone protein acetylation.
- Assessed the impact of SLC25A1 inhibition on apoptosis and therapeutic efficacy in neuroblastoma cells.
Main Results:
- SLC25A1-mediated citrate export is essential for MYCN-amplified neuroblastoma cell survival.
- Citrate export supports Acetyl-CoA production, driving anti-apoptotic gene BIRC3 and MCL1 acetylation.
- Inhibition of SLC25A1 induced significant apoptosis in MYCN-amplified neuroblastoma cells.
- SLC25A1 inhibition synergized with BCL2 antagonists, enhancing therapeutic effects.
Conclusions:
- SLC25A1 is a critical metabolic liability in MYCN-amplified neuroblastomas.
- Targeting SLC25A1 represents a promising therapeutic strategy for neuroblastoma.
- Combination therapy with SLC25A1 inhibitors and BCL2 antagonists shows potential for treating MYCN-amplified neuroblastomas.
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