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2014 ; 61
(ä): 226-40
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Lysosome size, motility and stress response regulated by fronto-temporal dementia
modifier TMEM106B
#MMPMID25066864
Stagi M
; Klein ZA
; Gould TJ
; Bewersdorf J
; Strittmatter SM
Mol Cell Neurosci
2014[Jul]; 61
(ä): 226-40
PMID25066864
show ga
Fronto-temporal lobar degeneration with TDP-43 (FTLD-TDP) is a fatal
neurodegeneration. TMEM106B variants are linked to FTLD-TDP risk, and TMEM106B is
lysosomal. Here, we focus on neuronal TMEM106B, and demonstrate co-localization
and traffic with lysosomal LAMP-1. pH-sensitive reporters demonstrate that the
TMEM106B C-terminus is lumenal. The TMEM106B N-terminus interacts with endosomal
adaptors and other TMEM106 proteins. TMEM106B knockdown reduces neuronal
lysosomal number and diameter by STED microscopy, and overexpression enlarges
LAMP-positive structures. Reduction of TMEM106B increases axonally transported
lysosomes, while TMEM106B elevation inhibits transport and yields large lysosomes
in the soma. TMEM106B overexpression alters lysosomal stress signaling, causing a
translocation of the mTOR-sensitive transcription factor, TFEB, to neuronal
nuclei. TMEM106B loss-of-function delays TFEB translocation after Torin-1-induced
stress. Enlarged TMEM106B-overexpressing lysosomes maintain organelle integrity
longer after lysosomal photodamage than do control lysosomes, while small
TMEM106B-knockdown lysosomes are more sensitive to illumination. Thus, neuronal
TMEM106B plays a central role in regulating lysosomal size, motility and
responsiveness to stress, highlighting the possible role of lysosomal biology in
FTLD-TDP.