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MTORC1 activation induces B7-H3–dependent metabolic reprogramming in renal cell carcinoma (RCC)

ABSTRACT: Renal cell carcinoma (RCC) affects over 435,000 people worldwide each year and remains a significant cause of cancer mortality. Aberrant activation of pathways such as mTORC1 is frequently observed in RCC, yet the mechanisms by which mTORC1 contributes to tumor development remain poorly understood. The lack of suitable animal models has limited progress in uncovering these mechanisms and advancing targeted treatments. Here, we performed single-cell transcriptomic, proteomic, and metabolomic profiling of kidneys from mice with embryonic Tsc2 deletion at E17.5, which revealed a distinct tumor cell population characterized by intercalated cell signatures, co-expression of Foxi1 and Rhcg, and hyperactivated mTORC1. These lesions closely resemble human chromophobe renal cell carcinoma (ChRCC), a subtype of RCC. The tumors show marked upregulation of the immune checkpoint molecule B7-H3. Mechanistically, the transcription factor NRF1 is elevated in Tsc2-deficient lesions and drives B7-H3 expression in tumor cells. In human specimens, B7-H3 is broadly expressed in both classical and sarcomatoid ChRCC and correlates with hallmark markers FOXI1, MUC2, and HEPACAM2. Strikingly, B7-H3 deletion in mice suppresses Tsc2 loss–driven cystic and tumor formation, restores amino acid metabolism, and attenuates aminoacyl-tRNA biosynthesis and proteasome activity. Collectively, these findings identify B7-H3 as a functional driver of Tsc2-mediated ChRCC and a promising therapeutic target in TSC-associated renal tumors.

ORGANISM(S): Mus musculus

PROVIDER: GSE307301 | GEO | 2026/07/07

REPOSITORIES: GEO

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Project description:We investigated the expression profiles of microRNAs (miRNA) in 26 renal cell carcinoma (RCC) FFPE tissues (3 chRCC, 5 papRCC and 18 ccRCC), 4 urothelial cell carcinomas of the upper urinary tract (UT-UCs) and 20 normal kidneys by using the miRCURY LNA™ microRNA Array, 6th gen (Exiqon, Woburn MA), containing capture probes that target all miRNAs for all species registered in the miRBASE version 16.0. Real-time PCR (qRT-PCR) using appropriate endogenous controls was performed in order to validate the microarray results of the 27 most differentially expressed (DE) miRNAs. We identified 434 miRNAs that were significantly deregulated in all tumours compared to the normal kidney tissues. Overall, 126 miRNAs (29%) showed increased expression and 303 miRNAs (69.8%) had decreased expression in RCCs and UT-UCs vs. the normal kidneys. Specifically, 374, 420, 421 and 409 miRNAs were 90% consistently down-regulated in ccRCC, papRCC, chRCC and UT-UC, respectively. Unsupervised two-way hierarchical clustering (HCL) with Euclidian distance accurately discriminated between RCC and UT-UC. Apart from one chRCC sample that was clustered with ccRCCs, HCL also managed to successfully classify the 3 RCC subtypes among them. Furthermore, it showed that ccRCC is more closely related to papRCC and that both are distinct from chRCC or UT-UC. Ninety-four miRNAs were co-upregulated among ccRCC, papRCC and chRCC; and 11, 44 and 24 miRNAs were specifically up-regulated in each one of the three RCC subtypes (ccRCC, chRCC and papRCC), respectively. On the other hand, 222 miRNAs were co-down-regulated in the three RCC subtypes, whereas 16, 18 and 5 miRNAs were specifically down-regulated in ccRCC, chRCC and papRCC, respectively. When the DE miRNAs in each RCC subtype were combined with those in UT-UC, we identified 89 and 206 miRNAs, respectively, that were up- and down-regulated in all tumor types. miRNA profiling can distinguish between RCC and UT-UC as well as among distinct RCC subtypes. Our data validicate that miRNA expression tends to be down-regulated in RCC versus the normal kidney tissue.

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MTORC1 activation induces B7-H3–dependent metabolic reprogramming in renal cell carcinoma (RCC)

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