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p53 -Dependent and -Independent Nucleolar Stress Responses.

Abstract：

:The nucleolus has emerged as a cellular stress sensor and key regulator of p53-dependent and -independent stress responses. A variety of abnormal metabolic conditions, cytotoxic compounds, and physical insults induce alterations in nucleolar structure and function, a situation known as nucleolar or ribosomal stress. Ribosomal proteins, including RPL11 and RPL5, become increasingly bound to the p53 regulatory protein MDM2 following nucleolar stress. Ribosomal protein binding to MDM2 blocks its E3 ligase function leading to stabilization and activation of p53. In this review we focus on a number of novel regulators of the RPL5/RPL11-MDM2-p53 complex including PICT1 (GLTSCR2), MYBBP1A, PML and NEDD8. p53-independent pathways mediating the nucleolar stress response are also emerging and in particular the negative control that RPL11 exerts on Myc oncoprotein is of importance, given the role of Myc as a master regulator of ribosome biogenesis. We also briefly discuss the potential of chemotherapeutic drugs that specifically target RNA polymerase I to induce nucleolar stress.

journal_name

Cells

journal_title

Cells

authors

Holmberg Olausson K,Nistér M,Lindström MS

doi

10.3390/cells1040774

subject

Has Abstract

pub_date

2012-10-15 00:00:00

pages

774-98

issue

4

issn

2073-4409

pii

cells1040774

journal_volume

1

pub_type

杂志文章

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