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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+Neurosci
2015 ; 35
(25
): 9315-28
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The Progranulin Cleavage Products, Granulins, Exacerbate TDP-43 Toxicity and
Increase TDP-43 Levels
#MMPMID26109656
Salazar DA
; Butler VJ
; Argouarch AR
; Hsu TY
; Mason A
; Nakamura A
; McCurdy H
; Cox D
; Ng R
; Pan G
; Seeley WW
; Miller BL
; Kao AW
J Neurosci
2015[Jun]; 35
(25
): 9315-28
PMID26109656
show ga
Mutations in the human progranulin gene resulting in protein haploinsufficiency
cause frontotemporal lobar degeneration with TDP-43 inclusions. Although progress
has been made in understanding the normal functions of progranulin and TDP-43,
the molecular interactions between these proteins remain unclear. Progranulin is
proteolytically processed into granulins, but the role of granulins in the
pathogenesis of neurodegenerative disease is unknown. We used a Caenorhabditis
elegans model of neuronal TDP-43 proteinopathy to specifically interrogate the
contribution of granulins to the neurodegenerative process. Complete loss of the
progranulin gene did not worsen TDP-43 toxicity, whereas progranulin
heterozygosity did. Interestingly, expression of individual granulins alone had
little effect on behavior. In contrast, when granulins were coexpressed with
TDP-43, they exacerbated its toxicity in a variety of behaviors including motor
coordination. These same granulins increased TDP-43 levels via a
post-translational mechanism. We further found that in human neurodegenerative
disease subjects, granulin fragments accumulated specifically in diseased regions
of brain. To our knowledge, this is the first demonstration of a toxic role for
granulin fragments in a neurodegenerative disease model. These studies suggest
that presence of cleaved granulins, rather than or in addition to loss of
full-length progranulin, may contribute to disease in TDP-43 proteinopathies.
|Animals
[MESH]
|Animals, Genetically Modified
[MESH]
|Caenorhabditis elegans
[MESH]
|DNA-Binding Proteins/*metabolism
[MESH]
|Disease Models, Animal
[MESH]
|Humans
[MESH]
|Immunoblotting
[MESH]
|Intercellular Signaling Peptides and Proteins/*metabolism
[MESH]