Disease Pathophysiology Research Report

Target Disease

• Disease Name: Renal Cell Carcinoma (RCC)
• MONDO ID: MONDO:0005070
• Category: Cancer

Pathophysiology Description (Narrative)

Renal cell carcinoma comprises biologically distinct subtypes with shared themes of oxygen/nutrient-sensing deregulation, profound metabolic rewiring, and an immunosuppressive tumor microenvironment. In clear cell RCC (ccRCC), loss of VHL on chromosome 3p stabilizes HIF-α subunits, especially HIF‑2α (EPAS1), driving angiogenesis, glycolysis, lipid storage, and immune escape programs; these changes underlie responsiveness to VEGF pathway inhibitors and, more recently, to direct HIF‑2α antagonism (belzutifan) (nguyen2024novelapproacheswith pages 1-2, coffey2024metabolicalterationsin pages 30-32). Multi-omic and single-cell studies corroborate ccRCC intratumoral heterogeneity, with tumor subpopulations enriched for EMT and inflammation programs and distinct chromatin-accessibility consequences of PBRM1 versus BAP1 mutations (coffey2024metabolicalterationsin pages 30-32). Whole‑genome sequencing of >700 ccRCC further refines driver landscapes and links structural copy alterations and canonical genes (VHL, PBRM1, SETD2, BAP1) to outcomes and immune infiltration, supporting immunotherapy rationales (coffey2024metabolicalterationsin pages 30-32).

Metabolically, ccRCC is a prototype metabolic cancer: in vivo isotope tracing shows suppressed TCA labeling and ETC activity in primary tumors but a metabolic shift toward enhanced TCA flux in metastases; mouse experiments demonstrate that stimulating mitochondrial respiration or NADH recycling promotes metastasis, whereas complex I inhibition suppresses it (bezwada2024mitochondrialcomplexi pages 1-2). High OXPHOS transcriptional programs correlate with resistance to immune checkpoint inhibition; experimentally dampening complex I (Ndufb8 knockdown) reduces hypoxia, increases functional CD8+ T‑cell infiltration, and improves anti‑PD‑L1 efficacy in vivo (tian2024targetingoxidativephosphorylation pages 1-2). Beyond glucose, ccRCC exhibits glutamine dependence, ferroptosis sensitivity controlled by glutathione/GPX4 systems, and extensive lipid/cholesterol rewiring including SR‑BI (SCARB1) upregulation and tryptophan–kynurenine pathway activation that fosters immune suppression (coffey2024metabolicalterationsin pages 11-13, coffey2024metabolicalterationsin pages 19-21, coffey2024metabolicalterationsin pages 30-32, coffey2024metabolicalterationsin pages 36-38).

In papillary RCC (pRCC), type 1 commonly harbors MET activation, while type 2 includes FH deficiency and transcription factor (MiT/TFE) fusions, producing oncometabolite accumulation (fumarate/succinate), dioxygenase inhibition (pseudohypoxia), CIMP hypermethylation, EMT, and vulnerabilities to PARP inhibition and arginine deprivation (coffey2024metabolicalterationsin pages 25-26, coffey2024metabolicalterationsin pages 8-9). Chromophobe RCC (chRCC) presents widespread chromosomal losses, mtDNA depletion, diminished ETC protein levels, and elevated glutathione, reflecting distinctive mitochondrial/redox states compared to oncocytoma and suggesting ferroptosis/redox-targeting opportunities (coffey2024metabolicalterationsin pages 11-13, zhang2025thepathogenesisand pages 9-9).

The RCC tumor microenvironment (TME) features exhausted CD8+ T cells, Tregs, M2‑like TAMs, aberrant vasculature, and metabolite gradients (lactate, hypoxia) that shape immune evasion. Spatial/single-cell profiling of bone metastases reveals MDSC→TAM trajectories, MRC1+FOLR2+ TAMs, and CD47+ T‑cell niches; these data illuminate pre‑metastatic/metastatic niche biology and therapeutic targets (coffey2024metabolicalterationsin pages 30-32). Collectively, genotype–epigenotype–metabolism–immunity couplings drive RCC initiation, progression, metastasis, and therapy response.

Table: Compact two-part table mapping key RCC genes/proteins to mechanisms, subtypes, GO processes and locations, plus cell types, anatomical sites, chemicals and disrupted processes — with source IDs for reference.; useful for ontology annotation and rapid mechanistic lookup.

1. Core Pathophysiology

• Primary mechanisms: VHL loss → HIF stabilization (HIF‑2α>HIF‑1α) → angiogenesis (VEGF), glycolysis, lipid storage, c‑Myc/cell‑cycle programs; immune evasion via PD‑L1 and kynurenine pathway (nguyen2024novelapproacheswith pages 1-2, coffey2024metabolicalterationsin pages 30-32, coffey2024metabolicalterationsin pages 36-38).
• Dysregulated pathways: HIF signaling; PI3K/AKT/mTOR; MET/HGF in pRCC; TCA/ETC remodeling with context-dependent OXPHOS; amino-acid metabolism (glutamine, tryptophan); ferroptosis control (GPX4/glutathione) (nguyen2024novelapproacheswith pages 1-2, coffey2024metabolicalterationsin pages 8-9, bezwada2024mitochondrialcomplexi pages 1-2, coffey2024metabolicalterationsin pages 11-13, coffey2024metabolicalterationsin pages 30-32).
• Affected cellular processes: chromatin remodeling and DNA repair (PBRM1, BAP1, SETD2); EMT and invasion; angiogenesis; metabolic plasticity; T‑cell exhaustion and myeloid reprogramming (coffey2024metabolicalterationsin pages 30-32, bezwada2024mitochondrialcomplexi pages 1-2, tian2024targetingoxidativephosphorylation pages 1-2).

Key quotes/data: - “ccRCC metastases unexpectedly have enhanced TCA cycle labelling… stimulating respiration or NADH recycling… promotes metastasis… inhibiting complex I decreases metastasis” (Nature, 14 Aug 2024, doi:10.1038/s41586-024-07812-3) (bezwada2024mitochondrialcomplexi pages 1-2). - “High OXPHOS levels are risk factors for ICI [failure]… shNdufb8 tumors had higher CD8+ T cells, less hypoxia, and improved responses to anti‑PD‑L1” (JITC, Feb 2024, doi:10.1136/jitc-2023-008226) (tian2024targetingoxidativephosphorylation pages 1-2).

2. Key Molecular Players

• Genes/Proteins (HGNC): VHL, EPAS1(HIF2A), HIF1A, PBRM1, BAP1, SETD2, MET, FH, SDHB/SDHC/SDHD, PTEN, PPARGC1A(PGC‑1α), GLS, LDHA, SCARB1; see embedded table for roles and GO/CC context (nguyen2024novelapproacheswith pages 1-2, coffey2024metabolicalterationsin pages 30-32, coffey2024metabolicalterationsin pages 8-9, coffey2024metabolicalterationsin pages 11-13, coffey2024metabolicalterationsin pages 36-38).
• Chemical entities (CHEBI): belzutifan (HIF‑2α inhibitor), fumarate/succinate (oncometabolites), glutamine, lactate; functions in metabolism/therapy (nguyen2024novelapproacheswith pages 1-2, coffey2024metabolicalterationsin pages 8-9, coffey2024metabolicalterationsin pages 11-13, coffey2024metabolicalterationsin pages 36-38).
• Cell types (CL): proximal tubule epithelium (cell of origin), TAMs (MRC1+FOLR2+), Tregs, exhausted CD8+ T cells (coffey2024metabolicalterationsin pages 30-32, tian2024targetingoxidativephosphorylation pages 1-2).
• Anatomical locations (UBERON): kidney cortex (primary site), bone (common metastatic niche with osteolytic biology) (bezwada2024mitochondrialcomplexi pages 1-2, zhang2025thepathogenesisand pages 8-9).

3. Biological Processes (for GO annotation)

• Response to hypoxia; HIF signaling; angiogenesis; glycolytic process; oxidative phosphorylation; glutamine metabolic process; tryptophan/kynurenine pathway; chromatin organization; histone methylation; EMT; regulation of immune response; ferroptosis regulation (nguyen2024novelapproacheswith pages 1-2, coffey2024metabolicalterationsin pages 30-32, tian2024targetingoxidativephosphorylation pages 1-2, coffey2024metabolicalterationsin pages 11-13, coffey2024metabolicalterationsin pages 8-9).

4. Cellular Components

• Nucleus (HIF transcriptional effects; chromatin remodelers PBRM1/BAP1/SETD2). Mitochondrion (TCA/ETC, GLS1, OXPHOS, mtDNA depletion in chRCC). Plasma membrane (MET, SCARB1; PD‑L1). Extracellular space (lactate, IDO/kynurenine signaling) (coffey2024metabolicalterationsin pages 30-32, coffey2024metabolicalterationsin pages 11-13, coffey2024metabolicalterationsin pages 8-9, tian2024targetingoxidativephosphorylation pages 1-2).

5. Disease Progression

• Initiation: 3p loss (VHL±PBRM1/BAP1/SETD2) in ccRCC; MET activation in pRCC; FH/SDH loss in hereditary/Type 2 pRCC (coffey2024metabolicalterationsin pages 30-32, coffey2024metabolicalterationsin pages 8-9, coffey2024metabolicalterationsin pages 25-26).
• Early growth: HIF‑2α–driven angiogenesis and metabolic rewiring (glycolysis, lipid storage; glutamine use); immune modulation (PD‑L1, IDO) (nguyen2024novelapproacheswith pages 1-2, coffey2024metabolicalterationsin pages 36-38).
• Progression/metastasis: EMT/inflammation subclones, chromatin remodeling divergence; metastases adopt higher TCA/ETC flux; pre‑metastatic niche priming and organotropism (bone) with myeloid and endothelial remodeling (coffey2024metabolicalterationsin pages 30-32, bezwada2024mitochondrialcomplexi pages 1-2).

6. Phenotypic Manifestations (HP terms)

• Hypervascular renal mass, paraneoplastic cachexia/hypercalcemia (HIF‑related), anemia, immune cold/excluded phenotypes, osteolytic bone lesions in metastasis, variable responses to ICIs dependent on OXPHOS/TME state (nguyen2024novelapproacheswith pages 1-2, tian2024targetingoxidativephosphorylation pages 1-2, bezwada2024mitochondrialcomplexi pages 1-2).

Recent Developments and Latest Research (2023–2024 prioritized)

• Nature 2024: Primary ccRCC has suppressed TCA/ETC; metastases increase TCA flux; complex I inhibition curtails metastasis—shifting views on mitochondrial targeting in advanced RCC (Aug 14, 2024; https://doi.org/10.1038/s41586-024-07812-3) (bezwada2024mitochondrialcomplexi pages 1-2).
• JITC 2024: High OXPHOS programs predict ICI resistance; targeting complex I alleviates hypoxia and reinvigorates CD8+ T cells, suggesting combinatorial strategies (Feb 2024; https://doi.org/10.1136/jitc-2023-008226) (tian2024targetingoxidativephosphorylation pages 1-2).
• Nat Rev Nephrol 2024: Integrative review codifies RCC as a metabolic disease across subtypes; details MET/pRCC, FH/SDH oncometabolism, ferroptosis liabilities, tryptophan metabolism–immune links (Jan 2024; https://doi.org/10.1038/s41581-023-00800-2) (coffey2024metabolicalterationsin pages 11-13, coffey2024metabolicalterationsin pages 19-21, coffey2024metabolicalterationsin pages 25-26, coffey2024metabolicalterationsin pages 30-32, coffey2024metabolicalterationsin pages 36-38).

Current Applications and Real‑World Implementations

• Targeted therapy: HIF‑2α inhibitor belzutifan approved for VHL‑associated and sporadic mRCC; mechanistic basis in VHL/HIF biology (Jan 31, 2024; https://doi.org/10.3390/cancers16030601) (nguyen2024novelapproacheswith pages 1-2).
• Therapeutic strategy design: OXPHOS/complex I inhibition combined with PD‑(L)1 to overcome hypoxia‑driven T cell dysfunction (tian2024targetingoxidativephosphorylation pages 1-2). VEGF pathway inhibition guided by angiogenic HIF programs; MET inhibitors in pRCC type 1 (coffey2024metabolicalterationsin pages 25-26, nguyen2024novelapproacheswith pages 1-2).

Expert Opinions and Authoritative Analyses

• Coffey & Simon 2024 (Nature Reviews Nephrology) synthesize hereditary/sporadic RCC metabolic mechanisms, highlighting shared vulnerabilities and the need for subtype‑specific modeling (Jan 2024; https://doi.org/10.1038/s41581-023-00800-2) (coffey2024metabolicalterationsin pages 11-13, coffey2024metabolicalterationsin pages 19-21, coffey2024metabolicalterationsin pages 25-26, coffey2024metabolicalterationsin pages 30-32, coffey2024metabolicalterationsin pages 36-38).

Relevant Statistics and Data

• 80 patients: intraoperative 13C infusions demonstrate suppressed TCA labeling in primary ccRCC vs adjacent kidney; higher TCA labeling in metastases; complex I inhibition decreases metastasis in mice (Nature, 2024) (bezwada2024mitochondrialcomplexi pages 1-2).

• High OXPHOS signature associates with poorer ICI responses across CheckMate/JAVELIN datasets; shNdufb8 tumors show increased CD8+ T cell infiltration and function under anti‑PD‑L1 therapy (JITC, 2024) (tian2024targetingoxidativephosphorylation pages 1-2).

Gene/Protein Annotations with Ontology Terms

• VHL (HGNC:12687): GO:0001666 response to hypoxia; GO:0006511 ubiquitin-dependent protein catabolic process; nucleus/cytosol (nguyen2024novelapproacheswith pages 1-2, coffey2024metabolicalterationsin pages 30-32).
• EPAS1/HIF2A (HGNC:3373): GO:0001525 angiogenesis; GO:0006355 regulation of transcription; nucleus (nguyen2024novelapproacheswith pages 1-2).
• PBRM1 (HGNC:30022): GO:0006338 chromatin remodeling; nucleus/chromatin (coffey2024metabolicalterationsin pages 30-32).
• BAP1 (HGNC:949): GO:0016570 histone deubiquitination; nucleus (coffey2024metabolicalterationsin pages 30-32).
• SETD2 (HGNC:15920): GO:0018024 histone lysine methylation (H3K36me3); nucleus (coffey2024metabolicalterationsin pages 30-32).
• MET (HGNC:7029): GO:0007167 enzyme linked receptor protein signaling; plasma membrane (coffey2024metabolicalterationsin pages 25-26).
• FH (HGNC:3700): GO:0006108 malate metabolic process; mitochondrion (coffey2024metabolicalterationsin pages 8-9).

Phenotype Associations (HP terms)

• HP:0009725 Renal cell carcinoma; HP:0002664 Anemia; HP:0003002 Cachexia; HP:0031286 Hypercalcemia; HP:0100244 Osteolytic bone lesions; HP:0031351 Immunodeficiency due to T‑cell dysfunction (nguyen2024novelapproacheswith pages 1-2, bezwada2024mitochondrialcomplexi pages 1-2, tian2024targetingoxidativephosphorylation pages 1-2).

Cell Type Involvement (CL terms)

• CL:0002328 Proximal tubule epithelial cell (cell of origin in many RCCs). CL:0000738 Regulatory T cell. CL:0000235 Macrophage (MRC1+FOLR2+ TAMs). CL:0000625 Endothelial cell (coffey2024metabolicalterationsin pages 30-32, tian2024targetingoxidativephosphorylation pages 1-2).

Anatomical Locations (UBERON terms)

• UBERON:0001225 Kidney cortex (primary). UBERON:0001474 Bone (metastatic niche) (bezwada2024mitochondrialcomplexi pages 1-2).

Chemical Entities (CHEBI)

• CHEBI:19508 Fumarate (oncometabolite in FH‑deficiency). CHEBI:30744 Glutamine (metabolic fuel). CHEBI:16651 L‑lactate (TME metabolite). Belzutifan (HIF‑2α inhibitor; drug entity) (coffey2024metabolicalterationsin pages 8-9, coffey2024metabolicalterationsin pages 11-13, coffey2024metabolicalterationsin pages 30-32, nguyen2024novelapproacheswith pages 1-2).

Evidence Items (with URLs and dates)

• Bezwada et al., Nature, 14 Aug 2024. “Mitochondrial complex I promotes kidney cancer metastasis.” https://doi.org/10.1038/s41586-024-07812-3 (bezwada2024mitochondrialcomplexi pages 1-2).
• Tian et al., J Immunother Cancer, Feb 2024. “Targeting oxidative phosphorylation to increase the efficacy of immune‑combination therapy in RCC.” https://doi.org/10.1136/jitc-2023-008226 (tian2024targetingoxidativephosphorylation pages 1-2).
• Coffey & Simon, Nat Rev Nephrol, Jan 2024. “Metabolic alterations in hereditary and sporadic RCC.” https://doi.org/10.1038/s41581-023-00800-2 (coffey2024metabolicalterationsin pages 11-13, coffey2024metabolicalterationsin pages 19-21, coffey2024metabolicalterationsin pages 25-26, coffey2024metabolicalterationsin pages 30-32, coffey2024metabolicalterationsin pages 36-38).
• Nguyen et al., Cancers, 31 Jan 2024. “Novel approaches with HIF‑2α targeted therapies in mRCC.” https://doi.org/10.3390/cancers16030601 (nguyen2024novelapproacheswith pages 1-2).
• Wu et al., Nature Communications, 20 Mar 2023. “Epigenetic and transcriptomic characterization…ccRCC.” https://doi.org/10.1038/s41467-023-37211-7 (coffey2024metabolicalterationsin pages 30-32).

Expert Synthesis and Implications

• Mechanistic integration indicates: (i) VHL/HIF‑2α is foundational in ccRCC, (ii) chromatin remodelers modulate EMT/inflammation programs and TME engagement, (iii) metabolic states are stage‑dependent (primary vs metastatic), with therapeutic windows differing across disease phases, and (iv) immunometabolic features (OXPHOS/hypoxia, tryptophan metabolism) condition ICI responses. These insights argue for phase‑adapted metabolic targeting (e.g., complex I inhibition in metastatic settings) and rational ICI combinations guided by OXPHOS hypoxia signatures and spatial immune readouts (bezwada2024mitochondrialcomplexi pages 1-2, tian2024targetingoxidativephosphorylation pages 1-2, coffey2024metabolicalterationsin pages 36-38).

References

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