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P53 amyloid induced cellular transformation and tumor formation in the mouse xenograft model

ABSTRACT: p53 amyloid formation is predicted to be involved in cancer initiation, but the direct evidence of how altered p53 acts as an oncogene is lacking. Cells with p53 amyloids show enhanced survival, apoptotic resistance with increased proliferation and migration rates. Proteomic profiling of cells containing p53 aggregates suggests that p53 amyloid formation triggers aberrant expression of pro-oncogenes while downregulating the tumor-suppressive genes. We propose that wild-type p53 amyloid formation can potentially contribute to the initiation of tumor development.

INSTRUMENT(S): TripleTOF 5600

ORGANISM(S): Homo Sapiens (human)

TISSUE(S): Mammary Gland Epithelial Cell

DISEASE(S): Breast Cancer

SUBMITTER: Tushar Maiti

LAB HEAD: Dr Tushar Kanti Maiti

PROVIDER: PXD019498 | Pride | 2022-07-16

REPOSITORIES: Pride

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Oncogenic gain of function due to p53 amyloids occurs through aberrant alteration of cell cycle and proliferation.

Navalkar Ambuja A Paul Ajoy A Sakunthala Arunima A Pandey Satyaprakash S Dey Amit Kumar AK Saha Sandhini S Sahoo Sarthak S Jolly Mohit Kumar MK Maiti Tushar K TK Maji Samir K SK

Journal of cell science 20220801 15

Transcription factor p53 (also known as TP53) has been shown to aggregate into cytoplasmic and nuclear inclusions, compromising its native tumor suppressive functions. Recently, p53 has been shown to form amyloids, which play a role in conferring cancerous properties to cells, leading to tumorigenesis. However, the exact pathways involved in p53 amyloid-mediated cellular transformations are unknown. Here, using an in cellulo model of full-length p53 amyloid formation, we demonstrate the mechanis ...[more]

PMID: 35796018

Similar Datasets

p53 amyloid formation induced cellular transformation and tumor formation in xenograft model

Project description:p53 mutation and its subsequent loss of function along with gain of oncogenic functions is associated with cancer. However, the exact mechanism of how altered p53 acts as an oncogene is not clear yet. Recently, it was suggested that p53 aggregation and amyloid formation leads to both loss of tumor suppressive function and gain of oncogenic functions in cells. In this study, we directly demonstrate that wild-type p53 amyloid formation imparts oncogenic properties to normal cells. Cells with p53 amyloid aggregates show enhanced survival, apoptotic resistance with increased proliferation and migration rate. We further establish the tumorigenic potential of p53 amyloid containing cells in a mice xenograft model. Furthermore, these tumors tested positive for p53 amyloid aggregates. Comprehensive gene-expression analysis suggests that p53 amyloid formation triggers aberrant expression of pro-oncogenes while downregulating the tumor suppressor associated genes. Interestingly, disaggregating p53 rescues the cellular transformation and also inhibits tumor development in mice. We propose that wild-type p53 amyloid formation can potentially contribute to initiation of tumor development.

2020-05-14 | GSE150522 | GEO

Transgelin contributes to a poor response of metastatic renal cell carcinoma to sunitinib treatment

Project description:Renal cell carcinoma (RCC) represents about 2-3% of all cancers with over 400,000 new cases per year. Sunitinib, a vascular endothelial growth factor tyrosine kinase receptor inhibitor, has been used mainly for first-line treatment of metastatic clear-cell RCC with good or intermediate prognosis. However, about one third of metastatic RCC patients do not respond to sunitinib, leading to disease progression. Here we aim to find and characterize proteins associated with poor sunitinib response in a pilot proteomics study. 16 RCC tumors from patients responding (8) vs. non-responding (8) to sunitinib in 3 months after treatment initiation, together with their adjacent non-cancerous tissues, were analyzed using data independent acquisition mass spectrometry. Proteomics analysis quantified 1996 protein groups (q<0.01) and revealed 27 proteins deregulated between tumors non-responding vs. responding to sunitinib, representing a pattern of deregulated proteins potentially contributing to sunitinib resistance. Gene set enrichment analysis showed up-regulation of epithelial-to-mesenchymal transition with transgelin as one of the most significantly abundant protein. Transgelin expression was silenced by CRISPR/Cas9 and RNA interference, and the cells with reduced transgelin level exhibited significantly slower proliferation. Our data indicate that transgelin is an essential protein supporting RCC cell proliferation which could contribute to intrinsic sunitinib resistance.

2021-11-03 | PXD027065 | Pride

BCL6 is required for the initiation and maintenance of chronic myeloid leukemia

Project description:We identified the BCL6 protooncogene as a critical downstream effector of FoxO3A in self-renewal signaling of CML-initiating cells. BCL6 represses Arf and p53 in CML cells and is required for leukemia stem cell maintenance, colony formation and initiation of leukemia in transplant recipients. Importantly, peptide inhibition of BCL6 in human CML cells compromises colony formation and leukemia-initiation in xenotransplanted mouse recipients. These findings identify peptide-inhibition of BCL6 as a novel strategy to eradicate leukemia-initiating cells in CML. Identification of BCL6 binding sites in human CML cell line JURL-MK1

2011-09-15 | E-GEOD-26085 | biostudies-arrayexpress

H3K4me3 Interactions with TAF3 Regulate Preinitiation Complex Assembly and Selective Gene Activation [ChIP-Seq]

Project description:Histone modifications regulate chromatin-dependent processes, yet the mechanisms by which they contribute to specific outcomes remain unclear. H3K4me3 is a prominent histone mark that is associated with active genes and promotes transcription through interactions with effector proteins that include initiation factor TFIID. We demonstrate that H3K4me3-TAF3 interactions direct global TFIID recruitment to active genes, some of which are p53 targets. Further analyses show that (i) H3K4me3 enhances p53-dependent transcription by stimulating preinitiation complex (PIC) formation; (ii) H3K4me3, through TAF3 interactions, can act either independently or cooperatively with the TATA box to direct PIC formation and transcription; and (iii) H3K4me3-TAF3/TFIID interactions regulate gene-selective functions of p53 in response to genotoxic stress. Our findings indicate a mechanism by which H3K4me3 directs PIC assembly for the rapid induction of specific p53 target genes Examination of TAF3, RNAPII, and H3K4me3 distribution in HCT116 cells.

2013-03-02 | E-GEOD-43539 | biostudies-arrayexpress

p53 amyloid formation induced cellular transformation and tumor formation in xenograft model

Project description:p53 amyloid formation induced cellular transformation and tumor formation in xenograft model

| PRJNA632633 | ENA

A designed inhibitor of p53 aggregation rescues p53 tumor-suppression in ovarian carcinomas

Project description:Half of all human cancers lose p53 function by missense mutations, with an unknown fraction of these containing p53 in a self-aggregated, amyloid-like state. Here we show that a cell-penetrating peptide, ReACp53, designed to inhibit p53 amyloid formation, rescues p53 function in cancer cell lines and in organoids derived from high-grade serous ovarian carcinomas (HGSOC), an aggressive cancer characterized by ubiquitous p53 mutations. Rescued p53 behaves similarly to its wild-type counterpart in regulating target genes, reducing cell proliferation and increasing cell death. Intraperitoneal administration decreases tumor proliferation and shrinks xenografts in vivo. Our data show the effectiveness of targeting a specific aggregation defect of p53 and its potential applicability to HGSOCs. Vehicle vs. ReACp53 treatment in 4 different samples: 2 cell lines (MCF7 w/ WT p53 as negative control and OVCAR3 w/ R248Q p53) and 2 clinical specimens (primary cells from patient #8 w/ WT p53 as negative control and primary cells from patient #1 w/ R248Q p53)

2016-01-04 | E-GEOD-74550 | biostudies-arrayexpress

A designed inhibitor of p53 aggregation rescues p53 tumor-suppression in ovarian carcinomas

2016-01-04 | GSE74550 | GEO

H3K4me3 Interactions with TAF3 Regulate Preinitiation Complex Assembly and Selective Gene Activation [HIT-Seq]

Project description:Histone modifications regulate chromatin-dependent processes, yet the mechanisms by which they contribute to specific outcomes remain unclear. H3K4me3 is a prominent histone mark that is associated with active genes and promotes transcription through interactions with effector proteins that include initiation factor TFIID. We demonstrate that H3K4me3-TAF3 interactions direct global TFIID recruitment to active genes, some of which are p53 targets. Further analyses show that (i) H3K4me3 enhances p53-dependent transcription by stimulating preinitiation complex (PIC) formation; (ii) H3K4me3, through TAF3 interactions, can act either independently or cooperatively with the TATA box to direct PIC formation and transcription; and (iii) H3K4me3-TAF3/TFIID interactions regulate gene-selective functions of p53 in response to genotoxic stress. Our findings indicate a mechanism by which H3K4me3 directs PIC assembly for the rapid induction of specific p53 target genes Examination of genome wide binding sites of TAF3 full length protein vs TAF3 PHD domain alone (Full vs PHD), with or without M880A mutation (WT vs mut) in mouse MEF cells using HITseq method (PNAS 2010, 107:3135-3140, PMID: 20133638)

2013-03-02 | E-GEOD-43540 | biostudies-arrayexpress

Insights into PH1 disease mechanisms from the analyses of the structural stability and dynamics of AGT variants

Project description:Primary hyperoxaluria type I (PH1) is a genetic disease caused by a deficiency in the peroxisomal alanine:glyoxylate aminotransferase (AGT) activity. Mutations in AGT mostly cause protein mistargeting and enhanced aggregation, although the molecular and structural basis of these mechanisms are unknown. In this work, we use hydrogen-deuterium exchange monitored by mass spectrometry (HDX-MS) to provide novel insight into these pathogenic mechanisms. We characterize the wild-type (WT) protein, the LM variant (containing the mutations P11L and I340M, a haplotype more frequent in PH1 patients) and the LM G170R (the most common genotype in PH1, introducing the G170R mutation on the LM background). Our study provides the first experimental analysis of the local stability and dynamics of AGT, showing that stability is heterogeneous in the native state and providing a blueprint for frustrated regions with potentially functional relevance. The LM and LM G170R variants destabilize locally the structure. Enzymatic transamination of the PLP bound to AGT hardly affects stability. Our study thus supports that AGT misfolding is not caused by dramatic effects on the stability and dynamics of the holo-protein.

2024-01-25 | PXD046749 | Pride

H3K4me3 Interactions with TAF3 Regulate Preinitiation Complex Assembly and Selective Gene Activation [Illumina BeadArray]

Project description:Histone modifications regulate chromatin-dependent processes, yet the mechanisms by which they contribute to specific outcomes remain unclear. H3K4me3 is a prominent histone mark that is associated with active genes and promotes transcription through interactions with effector proteins that include initiation factor TFIID. We demonstrate that H3K4me3-TAF3 interactions direct global TFIID recruitment to active genes, some of which are p53 targets. Further analyses show that (i) H3K4me3 enhances p53-dependent transcription by stimulating preinitiation complex (PIC) formation; (ii) H3K4me3, through TAF3 interactions, can act either independently or cooperatively with the TATA box to direct PIC formation and transcription; and (iii) H3K4me3-TAF3/TFIID interactions regulate gene-selective functions of p53 in response to genotoxic stress. Our findings indicate a mechanism by which H3K4me3 directs PIC assembly for the rapid induction of specific p53 target genes. Total RNAs from control or TAF3 knockdown cells before and after doxorubicin treatment were subjected to Illumina microarray analyses.

2013-03-02 | E-GEOD-43541 | biostudies-arrayexpress

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