PXD052506

PXD052506 is an original dataset announced via ProteomeXchange.

Title	Therapeutic Targeting of Dihydroorotate Dehydrogenase (DHODH) in Neuroblastoma: Modulating Lipid Metabolism and Ferroptosis
Description	Neuroblastoma is the most common heterogeneous solid tumor in childhood, with limited treatments available for high-risk patients. Previous studies have shown that Dihydroorotate dehydrogenase (DHODH) plays an essential role in the de novo synthesis of pyrimidine and have identified it as a potential therapeutic target in cancer. Our previous studies have shown that the higher expression of DHODH is associated with the worst survival of neuroblastoma patients. Through knockdown experiments, we validated that reducing DHODH expression in neuroblastoma cells leads to a decrease in cell viability. Subsequently, we harnessed virtual screening software to repurpose drugs, targeting DHODH as potential neuroblastoma therapeutics. We conducted molecular docking simulations with a database of 2702 FDA-approved drugs on DHODH and identified a number of drugs that demonstrated high affinity for DHODH. Among these drugs, we found regorafenib, a multi-kinase inhibitor, effectively inhibited neuroblastoma cell proliferation and was more efficient than leflunomide, an FDA-approved DHODH inhibitor. To determine whether regorafenib is a novel DHODH inhibitor, we employed thermal shift and enzyme fluorescence assays. These assays revealed that regorafenib not only enhanced binding stability but also reduced the enzymatic activity of DHODH. Since regorafenib is a multi-kinase inhibitor, we confirm changes in downstream proteins by comparison with shDHODH to determine whether these alterations result from targeting DHODH. To further investigate the molecular mechanism of regorafenib in targeting DHODH, we conducted a proteome analysis using tandem mass tag (TMT) labeling. This involved comparing samples treated with regorafenib to those with DHODH knockdown. Using Liquid Chromatograph-mass spectrometry/ mass spectrometry (LC-MS/MS), a total of 4471 proteins and 31518 peptides were identified. Furthermore, we identified 343 differentially expressed proteins in the shDHODH sample and 225 in the regorafenib treatment sample. We performed gene ontology (GO) enrichment analysis on these two sets of samples. The results of the GO enrichment analysis, focusing on biological function, indicated that proteins were correlated with lipid metabolism. After a research search, the proteome data and validation through western blot revealed common differentially expressed proteins related to the mevalonate pathway and subsequently linked to ferroptosis. Additionally, previous studies suggest a connection between DHODH and ferroptosis, leading us to investigate whether regorafenib treatment influences ferroptosis as confirmation that our drug targets DHODH. Moreover, neuroblastoma cells could be rescued by ferroptosis inhibitor liproxstatin-1. In summary, our findings highlight the potential of using regorafenib to target DHODH, presenting a promising therapeutic strategy for high-risk neuroblastoma.
HostingRepository	jPOST
AnnounceDate	2025-08-07
AnnouncementXML	Submission_2025-08-06_08:00:22.944.xml
DigitalObjectIdentifier
ReviewLevel	Non peer-reviewed dataset
DatasetOrigin	Original dataset
RepositorySupport	Unsupported dataset by repository
PrimarySubmitter	Jui Chia Shir
SpeciesList	scientific name: Homo sapiens (Human); NCBI TaxID: 9606;
ModificationList	L-methionine sulfoxide; Acetyl; S-carboxamidomethyl-L-cysteine
Instrument	Orbitrap Fusion Lumos

Revision	Datetime	Status	ChangeLog Entry
0	2024-05-23 00:15:59	ID requested
⏵ 1	2025-08-06 08:00:23	announced

Dataset with its publication pending

submitter keyword: DHODH, neuroblastoma, Regorafenib, proteomics, lipid metabolism, ferroptosis

Hsueh-Fen Juan
lab head
Jui Chia Shir
contact affiliation	NTU
dataset submitter

jPOST dataset URI

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