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Molecular analysis of a case of renal cell carcinoma with t(6;11) (p21;q12) reveals a link to a lysosome-like structure

ABSTRACT: TFEB has been recently reported to be a key molecule for lysosomal regulation. Renal cell carcinoma (RCC) with t(6;11) (p21;q12) is known to be the only tumor in which TFEB is upregulated. Transcriptome analysis using a whole-genome expression array and pathway analysis using upregulated genes in tumor tissue revealed that the lysosome-associated pathways were significantly deregulated. Total RNA was extracted from non-tumor and tumor in patient of renal cell carcinoma with t(6;11) (p21;q12) and subjected to gene expression microarray analysis.

ORGANISM(S): Homo sapiens

SUBMITTER: Keiko Matsuura

PROVIDER: E-GEOD-49901 | biostudies-arrayexpress |

REPOSITORIES: biostudies-arrayexpress

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Molecular analysis of a case of renal cell carcinoma with t(6;11) (p21;q12) reveals a link to a lysosome-like structure

Project description:TFEB has been recently reported to be a key molecule for lysosomal regulation. Renal cell carcinoma (RCC) with t(6;11) (p21;q12) is known to be the only tumor in which TFEB is upregulated. Transcriptome analysis using a whole-genome expression array and pathway analysis using upregulated genes in tumor tissue revealed that the lysosome-associated pathways were significantly deregulated.

2013-08-16 | GSE49901 | GEO

p21 Regulates LC Radiation Resistance

Project description:Treatment with ionizing irradiation (IR) may lead to accumulation of tumor-infiltrating T regulatory (Treg) cells and subsequent tumor resistance to radiotherapy. Here we focused on the contribution of Langerhans cells (LCs) to this phenomenon because of their unique ability to resist depletion by high-dose IR. We found that LCs resisted apoptosis and rapidly repaired DNA damage post-IR. Particularly, we found that p21 was overexpressed in LCs, and that p21-deficient LCs underwent apoptosis and accumulated DNA damage following IR treatment. Wild-type, but not p21-deficient, LCs upregulated major histocompatibility complex class II molecules, migrated to the draining lymph nodes and increased Treg cell numbers upon exposure to IR. These findings suggest a means for manipulating LC IR-resistance to increase cutaneous tumor response to radiotherapy. See above Cells were purified by flow cytometry and pooled until >10,000 cells/sample. At least 2 replicates of each sample were submitted.

2015-07-25 | E-GEOD-71330 | biostudies-arrayexpress

Homo sapiens

Project description:Molecular analysis of a case of renal cell carcinoma with t(6 11) (p21 q12) reveals a link to a lysosome-like structure

| PRJNA215380 | ENA

p21 Regulates LC Radiation Resistance

2015-07-25 | GSE71330 | GEO

Aberrant splicing of cdkn1a/p21 through micro-RNA mediated downregulation of JMJD6

Project description:Post-transcriptional modifications of tumor suppressors, including microRNA-mediated downregulation, are important events in tumor progression. To identify microRNAs involved in oncogenic transformation, we examined global microRNA profiles of three ras transgenic zebrafish models. Four microRNAs are upregulated in all transgenic systems. Analysis of the predicted targets shows that three of them target Jmjd6, and overexpression of Jmjd6 in ras transformed melanocytes blocks proliferation and melanoma development. We found that Jmjd6 functions to regulate splicing of the tumor suppressor cdkn1a/p21. Truncated cdkn1a/p21 transcripts, lacking the PCNA binding domain, accumulate in ras-expressing melanocytes during melanoma development. These findings implicate Jmjd6 in a novel mechanism for inactivation of a major tumor suppressor pathway in melanoma.

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TFEB drives mTORC1 hyperactivation and kidney disease in Tuberous Sclerosis Complex

Project description:Tuberous Sclerosis Complex (TSC) is caused by germline TSC1 or TSC2 mutations, leading to hyperactivation of mechanistic target of rapamycin complex 1 (mTORC1) and tumors in multiple organs including the brain, heart, lung (lymphangioleiomyomatosis), and kidney (angiomyolipoma and renal cell carcinoma). Previously, we found that TFEB is constitutively active in models of TSC. To determine the impact of TFEB in vivo, we generated two novel mouse models of TSC, resulting in premature death, in which kidney pathology was the primary phenotype. RNA sequencing revealed that lysosomal and proteasomal gene pathways were the most highly upregulated in the TSC2-deficient kidneys. Knockout of TFEB rescued both kidney pathology and overall survival in both models, indicating that TFEB is the primary driver of renal disease in TSC. Importantly, mTORC1 activity, which was elevated in the TSC2 knockout kidneys, was normalized by TFEB knockout. Knockdown of Rheb or treatment of TSC2-deficient cells with Rapamycin paradoxically increases TFEB phosphorylation at the mTORC1-site (S211) and relocalizes TFEB from the nucleus to the cytoplasm via a Rag-dependent mechanism. Accordingly, treatment of TSC2 knockout mice with Rapamycin normalized lysosomal gene expression, similar to TFEB knockout, suggesting that the beneficial effects of Rapamycin in TSC are TFEB-dependent. These results change the view of the mechanisms leading to mTORC1 hyperactivation in TSC and may lead to novel therapeutic avenues for the treatment of TSC.

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Microarray analysis of TFEB-regulated genes in vascular smooth muscle cells

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2020-11-21 | GSE138000 | GEO

TFEB activation in macrophages attenuates postmyocardial infarction ventricular dysfunction independently of ATG5-mediated autophagy

Project description:Lysosomes are at the epicenter of cellular processes critical for inflammasome activation in macrophages, including autophagy and lipid metabolism. Inflammasome activation and IL1-beta secretion are implicated in atherogenesis, ischemic cardiac injury and resultant heart failure; however, little is known about the role of macrophage lysosome function in regulating these processes. We hypothesized that macrophages exhibit lysosome dysfunction in heart failure due to ischemic injury, and that augmentation of macrophage lysosomal biogenesis via macrophage-specific overexpression of transcription factor EB (mf-TFEB) would attenuate ischemic remodeling by modulating macrophage inflammatory responses. In both mice subject to ischemia-reperfusion injury, and human heart tissue from patients with ischemic cardiomyopathy, we find evidence of lysosome insufficiency and autophagic impairment, respectively. Mf-TFEB overexpression significantly attenuated post-IR adverse left ventricular remodeling at 4 weeks without affecting scar size. Mf-TFEB overexpression reduced the relative amounts of pro-inflammatory macrophage populations in the myocardium. RNA sequencing of flow-sorted cardiac macrophages post-IR confirmed that TFEB stimulated a lysosomal transcriptional program in macrophages, and upregulated key targets involved in lysosomal lipid metabolism, which we show are critical for inflammasome suppression. Both TFEB-dependent inflammasome suppression and effects on post-IR remodeling were independent of autophagy. Our findings suggest that TFEB reprograms macrophage lysosomal lipid metabolism to attenuate inflammasome activity and protect against post-ischemic cardiac remodeling and simultaneously shift our understanding of how autophagy and lipid metabolism impact acute inflammation.

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