Gene/Protein Disease Symptom Drug Enzyme Compound
Pivot Concepts:   Target Concepts:
Query: UNIPROT:P43146 (tumour suppressor)
 5,935 document(s) hit in 31,850,051 MEDLINE articles (0.00 seconds)

The tumour suppressor BRCA1 is mutated in familial breast and ovarian cancer but its role in protecting other tissues from DNA damage has not been explored. Here we show a new role for BRCA1 as a gatekeeper of cardiac function and survival. In mice, loss of BRCA1 in cardiomyocytes results in adverse cardiac remodelling, poor ventricular function and higher mortality in response to ischaemic or genotoxic stress. Mechanistically, loss of cardiomyocyte BRCA1 results in impaired DNA double-strand break repair and activated p53-mediated pro-apoptotic signalling culminating in increased cardiomyocyte apoptosis, whereas deletion of the p53 gene rescues BRCA1-deficient mice from cardiac failure. In human adult and fetal cardiac tissues, ischaemia induces double-strand breaks and upregulates BRCA1 expression. These data reveal BRCA1 as a novel and essential adaptive response molecule shielding cardiomyocytes from DNA damage, apoptosis and heart dysfunction. BRCA1 mutation carriers, in addition to risk of breast and ovarian cancer, may be at a previously unrecognized risk of cardiac failure.
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PMID:BRCA1 is an essential regulator of heart function and survival following myocardial infarction. 2218 89

Cardiovascular disease is a leading cause of death worldwide, particularly in Western societies. During an ischaemic insult, ventricular pressure from the heart is diminished as a result of cardiac myocyte death by necrosis and apoptosis. Autophagy is a process whereby cells catabolise intracellular proteins in order to generate ATP in times of stress such as nutrient starvation and hypoxia. Emerging evidence suggests that autophagy plays a positive role in cardiac myocyte survival during periods of cellular stress performing an important damage limitation function. By promoting cell survival, cardiac myocyte loss is reduced thereby minimising the potential of heart failure. In contrast, it has been reported that autophagy can also be a form of cell death. By considering the various animal models of autophagy, we examine the role of the Signal Transducers and Activator of Transcription (STAT) proteins in the autophagic response. Additionally we review the role of the tumour suppressor, p53 and its family member p73 and their potential role in the autophagic response.
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PMID:Autophagy in the stress-induced myocardium. 2220 25

The HECT E3 ubiquitin ligase HACE1 is a tumour suppressor known to regulate Rac1 activity under stress conditions. HACE1 is increased in the serum of patients with heart failure. Here we show that HACE1 protects the heart under pressure stress by controlling protein degradation. Hace1 deficiency in mice results in accelerated heart failure and increased mortality under haemodynamic stress. Hearts from Hace1(-/-) mice display abnormal cardiac hypertrophy, left ventricular dysfunction, accumulation of LC3, p62 and ubiquitinated proteins enriched for cytoskeletal species, indicating impaired autophagy. Our data suggest that HACE1 mediates p62-dependent selective autophagic turnover of ubiquitinated proteins by its ankyrin repeat domain through protein-protein interaction, which is independent of its E3 ligase activity. This would classify HACE1 as a dual-function E3 ligase. Our finding that HACE1 has a protective function in the heart in response to haemodynamic stress suggests that HACE1 may be a potential diagnostic and therapeutic target for heart disease.
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PMID:HACE1-dependent protein degradation provides cardiac protection in response to haemodynamic stress. 2461 89