Journal
AUTOPHAGY
Volume 5, Issue 1, Pages 114-116Publisher
TAYLOR & FRANCIS INC
DOI: 10.4161/auto.5.1.7294
Keywords
p73; mTOR; p53; p63; chromatin immunoprecipitation; UVRAG; ATG5; ATG7; rapamycin; tumor suppressor
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Funding
- National Institutes of Health [CA70856, CA105436, ES00267, CA68485]
- US Army Medical Research and Materiel Command Grant [W81XWH-04-1-0304, GM07347]
- NATIONAL CANCER INSTITUTE [R01CA070856, R01CA105436, P30CA068485] Funding Source: NIH RePORTER
- NATIONAL INSTITUTE OF ENVIRONMENTAL HEALTH SCIENCES [P30ES000267] Funding Source: NIH RePORTER
- NATIONAL INSTITUTE OF GENERAL MEDICAL SCIENCES [T32GM007347] Funding Source: NIH RePORTER
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The p53 family consists of three transcription factors, p53, p63 and p73 that share domain architecture and sequence identity. The mTOR (mammalian target of rapamycin) kinase responds to growth factors and nutrient levels to regulate cellular growth and autophagy. Whereas p53 acts both upstream and downstream of mTOR, gene signature-based analyses have revealed that p73 is inhibited by mTOR activity p53 can both activate and repress autophagy levels depending on cellular context. While less is known about p73, recent studies have shown that it induces cellular autophagy and multiple autophagy-associated genes downstream of mTOR. Chromatin immunoprecipitation analyses demonstrate that endogenous p73 binds the regulatory regions of genes such as ATG5, ATG7 and UVRAG. How p73 regulates the expression levels of these genes in response to different cellular stresses remains unknown. Because p53 family members play key roles in tumor suppression, development, aging and neurodegeneration, the context and manner by which these transcription factors regulate autophagy may have implications for a wide range of human diseases.
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