Loss of VHL-mediated pRb regulation promotes clear cell renal cell carcinoma
Ontology highlight
ABSTRACT:
PROVIDER: PRJNA1244636 | ENA |
REPOSITORIES: ENA
Dataset's files
| Action | DRS | |||
|---|---|---|---|---|
| SRR32942369_1.fastq.gz | Fastqsanger.gz | |||
| SRR32942369_2.fastq.gz | Fastqsanger.gz | |||
| SRR32942370_1.fastq.gz | Fastqsanger.gz | |||
| SRR32942370_2.fastq.gz | Fastqsanger.gz | |||
| SRR32942371_1.fastq.gz | Fastqsanger.gz |
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Project description:The von Hippel-Lindau (VHL) tumor suppressor is a substrate-defining component of E3 ubiquitin ligase complexes that target cellular substrates for proteasome-mediated degradation. VHL inactivation by mutation or transcriptional silencing is observed in most sporadic cases of clear cell renal cell carcinoma (ccRCC). VHL loss in ccRCC leads to constitutive stabilization of E3 ligase substrates, including hypoxia inducible factor α (HIFα). HIFα stabilization upon VHL loss is known to contribute to ccRCC development through transactivation of hypoxia-responsive genes. HIF-independent VHL targets have been implicated in oncogenesis, although those mechanisms are less well-defined than for HIFα. Using proximity labeling to identify proteasomal-sensitive VHL interactors, we identified retinoblastoma protein (pRb) as a novel substrate of VHL. Mechanistically, VHL interacts with pRb in a proteasomal-sensitive manner, promoting its ubiquitin-mediated degradation. Concordantly, VHL-inactivation results in pRb hyperstabilization. Functionally, loss of pRb in ccRCC led to increased cell death, transcriptional changes, and loss of oncogenic properties in vitro and in vivo. We also show that downstream transcriptional changes induced by pRb hyperstabilization may contribute to ccRCC tumor development. Together, our findings reveal a novel VHL-related pathway which can be therapeutically targeted to inhibit ccRCC tumor development.
2025-04-08 | GSE293447 | GEO
Project description:Inactivation of the von Hippel-Lindau (VHL) E3 ubiquitin ligase protein is a hallmark of clear cell renal cell carcinoma (ccRCC). Identifying how pathways affected by VHL loss contribute to ccRCC remains challenging. We used a genome-wide in vitro expression strategy to identify proteins that bound VHL only when hydroxylated. Zinc fingers and homeoboxes 2 (ZHX2) was found as a VHL target and its hydroxylation allowed VHL to regulate its protein stability. Tumor cells from ccRCC patients with VHL loss-of-function mutations usually had increased ZHX2 amount and nuclear localization. Functionally, depletion of ZHX2 inhibited VHL-deficient ccRCC cell growth in vitro and in vivo. Mechanistically, integrated ChIP-Seq and microarray analysis showed that ZHX2 promoted NF-kB activation. These studies reveal ZHX2 as a potential therapeutic target for ccRCC.
2018-07-19 | GSE109953 | GEO
Project description:The human renal cancer cell line 786-0 was transfected with 3 vectors allowing the doxycycline-inducible expression of 1) the full length wild type sequence of VHL: 786-0 VHL WT, VHL+/+, 2) the R167Q mutant : 786-0 R167Q, VHL mutated, 3) the empty vector : 786-0 EV, VHL-/-. The aim of the study was to examine whether the VHL-R167Q mutation, which is associated with a high risk of developping clear cell renal carcinomas, could impact the plasticity of renal carcinoma cells.
2021-12-09 | E-MTAB-11168 | biostudies-arrayexpress
Project description:VHL deficiency drives enhancer activation of oncogenes in clear cell renal cell carcinoma
| PRJNA340245 | ENA
Project description:Inactivation of the von Hippel-Lindau (VHL) E3 ubiquitin ligase protein is a hallmark feature of ccRCC, a clear cell renal cell carcinoma. However, elucidating how VHL loss drives ccRCC pathogenesis remains challenging. As the most abundant posttranscriptional modification of mRNA in eukaryotes, N6-methyladenine (m6A) is involved in the posttranscriptional regulation of mRNA molecules and has been found to play an important role in the biological process of tumorigenesis and cancer progression. Here, we show that VHL has a protein interaction with the m6A demethylase FTO, but does not perform the classical function of targeting FTO for ubiquitination degradation. Rather, VHL acts as an adapter that promotes CK2 phosphorylation of FTO, thereby regulating the enzymatic activity of FTO. MeRIP-Seq and RNA-seq sequencing analyses identified EGR1 as one of the FTO targets for VHL-deficient ccRCC cell survival. Mechanistically, FTO in ccRCC decreases the m6A level of EGR1 and inhibits EGR1 and P53 protein levels, thereby promoting ccRCC proliferation. In summary, our study identified FTO as a potential non-hypoxia inducible factor (HIF) classical substrate of VHL, highlighted the critical role of FTO in regulating m6A levels in ccRCC progression, and identified the CK2-FTO-EGR1-P53 regulatory axis as a potential target for the treatment of VHL-deficient ccRCC.
2025-08-08 | PXD053566 | Pride
Project description:786-0 is a cell line derived from a clear cell renal carcinoma. Previous studies have shown that the 786-O cell line harbors an inactivating mutation in the von-Hippel Lindau (VHL) gene. Mutations in the VHL gene occur in the majority of sporadic clear cell renal cell. To determine how inactivation of the VHL affects cellular functions, we created a derivative of 786-0, which we call 786-VHL in which a functional allele of VHL has been introduced back into the 786-O cell line. The renal cell carcinoma cell line 786-0, which harbors a mutated allele of VHL, was compared to a cell line derived from 786-0, termed 786-VHL, that contains a functional allele of VHL. Genes whose expression characteristics were dependent on functional VHL were identified.
2010-06-23 | E-GEOD-22256 | biostudies-arrayexpress
Project description:VHL Substrate Transcription Factor ZHX2 As An Oncogenic Driver In Clear Cell Renal Cell Carcinoma
| PRJNA432414 | ENA
Project description:A498 cells, established from a clear cell renal cell cancer of a 52 years old male patient, were obtained from ATCC and maintained in DMEM supplemented with 10% fetal calf serum (FCS). This cell line does not express functional VHL. A498 subclones stably transfected with HA-pVHL30 or control plasmid have been described and were maintained in 0.5 mg/ml G418.
2003-09-18 | E-MEXP-13 | biostudies-arrayexpress
Project description:Clear cell renal cell carcinoma (ccRCC) arising in the setting of von Hippel–Lindau (VHL) disease is a rare type of kidney cancer and features VHL germline mutation. This type of ccRCC is rarely characterised at the single-cell level. In this work, whole-exome sequencing and single-cell RNA sequencing (scRNA-seq) were conducted on one ccRCC sample with VHL disease. Integrating scRNA-seq and whole-exome sequencing data by the Seurat package, we determined the relationship between single-cell transcriptome features and gene mutations. Immunohistochemistry and immunofluorescence were performed on one VHL germline mutation ccRCC and six non-VHL germline mutation ccRCC samples. We revealed the gene expression characteristics of ccRCC with VHL germline mutation. The frameshift mutations in OBP2A and BCR1, and the elevated expression of COX7A1 were most specific characteristics of ccRCC tumor cells with VHL mutation. And the extensive infiltration of exhausted T cells was the characteristic of tumor microenvironment. In addition, we discovered the relationship between genetic mutations and immune checkpoints. This work highlights the single-cell transcriptome and DNA-level information of this rare ccRCC and will provide more genetic insights and references into this rare disease.
2025-11-12 | GSE254498 | GEO
Project description:Renal cancer accounts for 2% to 3% of all adult malignancies in the US. In 2011 more than 64,770 new cases and 13,000 deaths were reported and the incidence is steadily increasing by 2.5% per year. Clear cell renal carcinoma (ccRCC) represents the majority (85% to 90%) of adult kidney cancers and is the most malignant. This cancer is characterized by an early loss of the von Hippel-Lindau tumor suppressor (VHL) on short arm of chromosome 3 in the majority of tumors (80%). It is a classic knowledge that loss of VHL results in an increased accumulation and activity of the hypoxia-inducible transcription factor (HIF), which in turns activates expression of genes promoting tumor growth. In that respect, induction of angiogenic factors induces blood flow through the tumors and delivery of nutrients and oxygen to cancer cells, while induction of genes inducing anaerobic glycolysis supports adaptation to reduced nutrients availability and shifts towards metabolic pathways promoting tumor growth. Recently we have discovered another tumor suppressing pathway regulated by VHL. We found that VHL is a major regulator of the process of macroautophagy (autophagy) (ref). We identified that VHL induces expression of a microRNA, miR-204, which in turn inhibits activity of a major regulator required for the formation of autophagosome, LC3B. LC3B-mediated autophagy is necessary for the ccRCC tumor growth, and inhibition of this process by VHL and miR-204 significantly contributes to the tumor suppression. Most importantly, we discovered that VHL by inhibiting activity of HIF, induced expression and activity of an LC3B paralog, LC3C. In contrast to LC3B, LC3C acts as a tumor suppressor, indicating the specificity and complexity of different autophagic programs. Integrating these novel data with the established role of VHL in regulating angiogenesis produces a more global picture of VHL as a master tumor suppressor that regulates nutrient access for renal cancer cells from both extracellular and intracellular sources. In the process of searching for other genes induced by VHL that could participate in the tumor suppressing activity of VHL, we discovered that reconstitution of VHL in RCC cells induces enrichment of genes expressed from the Smith-Magenis locus (SM), located on the short arm of chromosome 17p11.2. Smith-Magenis syndrome is a complex neurobehevioural disorder, characterized by intellectual impairment, craniofacial and skeletal anomalies and sleep disturbance. Recently, deletions or mutations of one specific gene in the SM locus, RAI1, (retinoic acid induced 1), were shown to be responsible for the syndrome. Interestingly, this locus contains another kidney tumor suppressor gene, folliculin (FLCN), of which activity is lost in the genetic dominant disorder, Birt-Hogg-Dube syndrome (BHD). BHD is characterized by skin fibrofolliculomas, pulmonary cysts and spontaneous pneumothorax, as well as renal cancer of mixed histological types, including chromophobe, oncocytic, clear cell and papillary type. Here we show that VHL regulates expression of FLCN, and in turn FLCN contributes to the VHL-mediated suppression of tumor growth. Two-condition experiment, VHL(-) vs. VHL(+). 4 biological replicates in each group. Two dual-channel arrays with VHL(+) on Cy5 and VHL(-) on Cy3, and two dual-channel arrays with flipped samples.
2013-05-20 | E-GEOD-47106 | biostudies-arrayexpress