TP53 Modulates Oxidative Stress in Gata1+ Erythroid Cells

Stem Cell Reports

Ashley C. Kramer¹  Ying Y. Gibbens¹  Troy C. Lund¹  Jakub Tolar¹  Jenna Weber¹  Margaret Shevik¹  Ying Zhang² 

[1] Division of Pediatric Blood and Marrow Transplantation, University of Minnesota, Minneapolis, MN 55455, USA;Minnesota Supercomputing Institute, University of Minnesota, Minneapolis, MN 55455, USA;

关键词: erythroid precursors;    oxidative stress;    tp53;    zebrafish;    reactive oxygen species;    mitochondria;   

DOI  :  10.1016/j.stemcr.2016.12.025

来源: DOAJ

【 摘 要 】

Metabolism of oxidative stress is necessary for cellular survival. We have previously utilized the zebrafish as a model of the oxidative stress response. In this study, we found that gata1-expressing erythroid cells contributed to a significant proportion of total-body oxidative stress when animals were exposed to a strong pro-oxidant. RNA-seq of zebrafish under oxidative stress revealed the induction of tp53. Zebrafish carrying tp53 with a mutation in its DNA-binding domain were acutely sensitive to pro-oxidant exposure and displayed significant reactive oxygen species (ROS) and tp53-independent erythroid cell death resulting in an edematous phenotype. We found that a major contributing factor to ROS was increased basal mitochondrial respiratory rate without reserve. These data add to the concept that tp53, while classically a tumor suppressor and cell-cycle regulator, has additional roles in controlling cellular oxidative stress.

【 授权许可】

Unknown