mTOR regulates autophagy-associated genes downstream of p73

JM Rosenbluth, JA Pietenpol - Autophagy, 2009 - Taylor & Francis
JM Rosenbluth, JA Pietenpol
Autophagy, 2009Taylor & Francis
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 …
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.
Taylor & Francis Online