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.jpg): Failed to open stream: No such file or directory in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 117 J+Biol+Chem
2017 ; 292
(14
): 5737-5747
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mTOR complex 1 activity is required to maintain the canonical endocytic recycling
pathway against lysosomal delivery
#MMPMID28196862
Dauner K
; Eid W
; Raghupathy R
; Presley JF
; Zha X
J Biol Chem
2017[Apr]; 292
(14
): 5737-5747
PMID28196862
show ga
The plasma membrane of mammalian cells undergoes constitutive endocytosis,
endocytic sorting, and recycling, which delivers nutrients to the lysosomes. The
receptors, along with membrane lipids, are normally returned to the plasma
membrane to sustain this action. It is not known, however, whether this process
is influenced by metabolic conditions. Here we report that endocytic recycling
requires active mechanistic target of rapamycin (aka mammalian target of
rapamycin) (mTORC1), a master metabolic sensor. Upon mTORC1 inactivation, either
by starvation or by inhibitor, recycling receptors and plasma membrane lipids,
such as transferrin receptors and sphingomyelin, are delivered to the lysosomes.
This lysosomal targeting is independent of canonical autophagy: both WT and
Atg5(-/-) mouse embryonic fibroblasts responded similarly. Furthermore, we
identify hepatocyte growth factor-regulated tyrosine kinase substrate (Hrs), an
endosomal sorting complexes required for transport (ESCORT-0) component, as a
downstream target of mTORC1. Hrs requires mTORC1 activity to maintain its protein
expression level. Silencing Hrs without decreasing mTORC1 activity is sufficient
to target transferrin and sphingomyelin to the lysosomes. It is thus evident that
the canonical recycling pathway is under the regulation of mTORC1 and likely most
predominant in proliferating cells where mTORC1 is highly active.
|Animals
[MESH]
|Autophagy-Related Protein 5/genetics/metabolism
[MESH]
|Biological Transport, Active/physiology
[MESH]
|Cell Proliferation/physiology
[MESH]
|Cells, Cultured
[MESH]
|Embryo, Mammalian/cytology/*metabolism
[MESH]
|Endocytosis/*physiology
[MESH]
|Endosomal Sorting Complexes Required for Transport/genetics/metabolism
[MESH]