Ulk1 plays a critical role in the autophagic clearance of mitochondria and ribosomes during reticulocyte maturation.

Abstract:

:Production of a red blood cell's hemoglobin depends on mitochondrial heme synthesis. However, mature red blood cells are devoid of mitochondria and rely on glycolysis for ATP production. The molecular basis for the selective elimination of mitochondria from mature red blood cells remains controversial. Recent evidence suggests that clearance of both mitochondria and ribosomes, which occurs in reticulocytes following nuclear extrusion, depends on autophagy. Here, we demonstrate that Ulk1, a serine threonine kinase with homology to yeast atg1p, is a critical regulator of mitochondrial and ribosomal clearance during the final stages of erythroid maturation. However, in contrast to the core autophagy genes such as atg5 and atg7, expression of ulk1 is not essential for induction of macroautophagy in response to nutrient deprivation or for survival of newborn mice. Together, these data suggest that the ATG1 homologue, Ulk1, is a component of the selective autophagy machinery that leads to the elimination of organelles in erythroid cells rather that an essential mechanistic component of autophagy.

journal_name

Blood

journal_title

Blood

authors

Kundu M,Lindsten T,Yang CY,Wu J,Zhao F,Zhang J,Selak MA,Ney PA,Thompson CB

doi

10.1182/blood-2008-02-137398

subject

Has Abstract

pub_date

2008-08-15 00:00:00

pages

1493-502

issue

4

eissn

0006-4971

issn

1528-0020

pii

blood-2008-02-137398

journal_volume

112

pub_type

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