EP300
Histone acetyltransferase p300 (EC 2.3.1.48) (p300 HAT) (E1A-associated protein p300) (Histone butyryltransferase p300) (EC 2.3.1.-) (Histone crotonyltransferase p300) (EC 2.3.1.-) (Protein 2-hydroxyisobutyryltransferase p300) (EC 2.3.1.-) (Protein propionyltransferase p300) (EC 2.3.1.-) [P300]
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In the current study, we aimed to explore the correlation between TRIM27 and breast cancer prognosis, as well as the functions of TRIM27 in breast cancer and their underlying mechanisms. Bioinformatics analyses were used to examine the correlation between TRIM27 and breast cancer prognosis. Moreover, TRIM27 knockdown and overexpression in breast cancer cells were performed to investigate its functions in breast cancer. Tamoxifen (TAM) was applied to evaluate the influence of TRIM27 on chemoresistance of breast cancer cells, while co-immunoprecipitation (coIP) was performed to identify the E3 ubiquitin ligase capability of TRIM27. High expression of TRIM27 was found in non-triple-negative breast cancer (non-TNBC) tumor tissues and was positively correlated with the mortality of non-TNBC patients. Moreover, TRIM27 could suppress non-TNBC cell apoptosis and senescence, promote cell viability and tumor growth, counteract the anti-cancer effects of TAM, and mediate ubiquitination of p21. In addition, EP300 could enhance the expression of TRIM27 and its transcription promoter H3K27ac. TRIM27, through ubiquitination of p21, might serve as a prognostic biomarker for non-TNBC prognosis. TRIM27 functions as a novel oncogene in non-TNBC cellular processes, especially suppressing cell senescence and interfering with non-TNBC chemoresistance.
Keywords
- EP300
- TRIM27
- breast cancer
- cell apoptosis
- cell senescence
- chemoresistance
- p21
- prognosis
- transcription
- ubiquitination
Mesenchymal stem cells (MSCs) are multipotent cells that can be widely used in stem cell therapy. However, few studies have revealed the potential mechanisms of the changes in aging MSC. In this study, microarray data GSE35955 was downloaded from the Gene Expression Omnibus database. Then limma package in R was used to filtrate differentially expressed genes (DEGs), Transcription factors (TFs) were predicted by DCGL package. After predicting TFs, protein-protein interaction (PPI) network and TF-mediated transcriptional regulation network were constructed. The functional and pathway enrichment analysis of screened DEGs, hub genes and TFs were conducted by the DAVID. Totally 156 up-regulated DEGs and 343 down-regulated DEGs were obtained. 6 hub genes (CTNNB1, PPP2R1A, FYN, MAPK1, PIK3C2A and EP300) were obtained from PPI network. 11 TFs (CREB1, [[CUX1]], EGR1, EP300, FOXC1, HSF2, MEF2A, PLAU, SP1, STAT1 and USF1) for DEGs were predicted and 2 highly scored co-expression relationships (EP300-PPP2R1A and STAT1-FOXC1) were acquired from the TF-mediated transcriptional regulation network. The discovery of the hub genes, TFs and pathways might contribute to the understanding of genetic and molecular functions of aging-related changes in MSC. Further validation studies on genes and TFs such as CTNNB1, FYN, PPP2R1A, MAPK1, EP300 and related biological processes and pathways, including adherens junction, DNA damage caused from oxidative stress, attribution of telomere, MSC differentiation and epigenetic regulation, are urgent for clinical prevention and treatment.
MeSH Terms
- Adult
- Aged
- Aged, 80 and over
- Aging
- Gene Expression Profiling
- Gene Expression Regulation
- Humans
- Mesenchymal Stem Cells
- Middle Aged
- Mitogen-Activated Protein Kinase 1
- Oligonucleotide Array Sequence Analysis
- Protein Interaction Maps
- Protein Phosphatase 2
- Proto-Oncogene Proteins c-fyn
- Transcription Factors
- beta Catenin
Keywords
- Differentially expressed genes
- Enrichment analysis
- Gene Expression Omnibus
- Hub genes
- Microarray analysis
- Protein-protein interaction network
- Transcriptional regulatory network
The capacity of cells and organisms to sustain, and to eventually adapt to, environmental and genetic insults declines with age. Because macroautophagy/autophagy is regarded as one of the major determinants of cellular fitness in vitro and in vivo, maneuvers that aim at promoting autophagy may slow down aging and promote health span. Caloric restriction (CR), a reduction in caloric intake without malnutrition, efficiently counteracts aging-associated features, yet is difficult to be applied to humans. Caloric-restriction mimetics (CRMs) are pharmacological agents that recapitulate the main biochemical properties of CR, namely a global reduction of protein acetylation and the induction of autophagy. We found that the ancient drug aspirin and its active metabolite salicylate stimulate autophagic flux by virtue of their inhibitory action on acetyltransferase EP300. The inhibition of EP300 results from a direct competition between salicylate and acetyl coenzyme A for binding to the catalytic domain of the enzyme. This mode of action appears to be conserved across evolution as it accounts for the induction of autophagy by aspirin in various mouse models and in the nematode [i]Caenorhabditis elegans[/i]. In sum, aspirin acts as a CRM.
MeSH Terms
- Acetyl Coenzyme A
- Animals
- Aspirin
- Autophagy
- Caenorhabditis elegans
- Caloric Restriction
- Humans
- Mice
Keywords
- AMPK
- Acetylation
- aging
- autophagy
- fasting
- inflammation
- longevity
- mitophagy
- salicylate
The age-associated deterioration in cellular and organismal functions associates with dysregulation of nutrient-sensing pathways and disabled autophagy. The reactivation of autophagic flux may prevent or ameliorate age-related metabolic dysfunctions. Non-toxic compounds endowed with the capacity to reduce the overall levels of protein acetylation and to induce autophagy have been categorized as caloric restriction mimetics (CRMs). Here, we show that aspirin or its active metabolite salicylate induce autophagy by virtue of their capacity to inhibit the acetyltransferase activity of EP300. While salicylate readily stimulates autophagic flux in control cells, it fails to further increase autophagy levels in EP300-deficient cells, as well as in cells in which endogenous EP300 has been replaced by salicylate-resistant EP300 mutants. Accordingly, the pro-autophagic activity of aspirin and salicylate on the nematode Caenorhabditis elegans is lost when the expression of the EP300 ortholog cpb-1 is reduced. Altogether, these findings identify aspirin as an evolutionary conserved CRM.
MeSH Terms
- Acetyl Coenzyme A
- Animals
- Aspirin
- Autophagy
- Caloric Restriction
- Cell Line, Tumor
- E1A-Associated p300 Protein
- Humans
- Metabolome
- Metabolomics
- Mice, Inbred C57BL
Keywords
- EP300
- acetylation
- aging
- autophagy
- longevity
- metabolome
- salicylate