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2017 ; 46
(3
): 405-420
Nephropedia Template TP
gab.com Text
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English Wikipedia
The Ubiquitin Binding Protein TAX1BP1 Mediates Autophagasome Induction and the
Metabolic Transition of Activated T Cells
#MMPMID28314591
Whang MI
; Tavares RM
; Benjamin DI
; Kattah MG
; Advincula R
; Nomura DK
; Debnath J
; Malynn BA
; Ma A
Immunity
2017[Mar]; 46
(3
): 405-420
PMID28314591
show ga
During immune responses, naive T cells transition from small quiescent cells to
rapidly cycling cells. We have found that T cells lacking TAX1BP1 exhibit delays
in growth of cell size and cell cycling. TAX1BP1-deficient T cells exited G(0)
but stalled in S phase, due to both bioenergetic and biosynthetic defects. These
defects were due to deficiencies in mTOR complex formation and activation. These
mTOR defects in turn resulted from defective autophagy induction. TAX1BP1 binding
of LC3 and GABARAP via its LC3-interacting region (LIR), but not its
ubiquitin-binding domain, supported T cell proliferation. Supplementation of
TAX1BP1-deficient T cells with metabolically active L-cysteine rescued mTOR
activation and proliferation but not autophagy. These studies reveal that TAX1BP1
drives a specialized form of autophagy, providing critical amino acids that
activate mTOR and enable the metabolic transition of activated T cells.
|Animals
[MESH]
|Autophagosomes/*immunology/metabolism
[MESH]
|Autophagy/immunology
[MESH]
|Cell Separation
[MESH]
|Chromosomes, Artificial, Bacterial
[MESH]
|Intracellular Signaling Peptides and Proteins/*immunology/metabolism
[MESH]