TY - JOUR
T1 - ALS/FTD-associated FUS activates GSK-3β to disrupt the VAPB-PTPIP51 interaction and ER-mitochondria associations
AU - Stoica, Radu
AU - Paillusson, Sébastien
AU - Gomez-Suaga, Patricia
AU - Mitchell, Jacqueline C.
AU - Lau, Dawn H W
AU - Gray, Emma H.
AU - Sancho, Rosa M.
AU - Vizcay-Barrena, Gema
AU - De Vos, Kurt J.
AU - Shaw, Christopher
AU - Hanger, Diane P.
AU - Noble, Wendy
AU - Miller, Christopher C J
PY - 2016/9/1
Y1 - 2016/9/1
N2 - Defective FUS metabolism is strongly associated with amyotrophic lateral sclerosis and frontotemporal dementia (ALS/FTD), but the mechanisms linking FUS to disease are not properly understood. However, many of the functions disrupted in ALS/FTD are regulated by signalling between the endoplasmic reticulum (ER) and mitochondria. This signalling is facilitated by close physical associations between the two organelles that are mediated by binding of the integral ER protein VAPB to the outer mitochondrial membrane protein PTPIP51, which act as molecular scaffolds to tether the two organelles. Here, we show that FUS disrupts the VAPB-PTPIP51 interaction and ER-mitochondria associations. These disruptions are accompanied by perturbation of Ca2+ uptake by mitochondria following its release from ER stores, which is a physiological read-out of ER-mitochondria contacts. We also demonstrate that mitochondrial ATP production is impaired in FUS-expressing cells; mitochondrial ATP production is linked to Ca2+ levels. Finally, we demonstrate that the FUS-induced reductions to ER-mitochondria associations and are linked to activation of glycogen synthase kinase-3β (GSK-3β), a kinase already strongly associated with ALS/FTD.
AB - Defective FUS metabolism is strongly associated with amyotrophic lateral sclerosis and frontotemporal dementia (ALS/FTD), but the mechanisms linking FUS to disease are not properly understood. However, many of the functions disrupted in ALS/FTD are regulated by signalling between the endoplasmic reticulum (ER) and mitochondria. This signalling is facilitated by close physical associations between the two organelles that are mediated by binding of the integral ER protein VAPB to the outer mitochondrial membrane protein PTPIP51, which act as molecular scaffolds to tether the two organelles. Here, we show that FUS disrupts the VAPB-PTPIP51 interaction and ER-mitochondria associations. These disruptions are accompanied by perturbation of Ca2+ uptake by mitochondria following its release from ER stores, which is a physiological read-out of ER-mitochondria contacts. We also demonstrate that mitochondrial ATP production is impaired in FUS-expressing cells; mitochondrial ATP production is linked to Ca2+ levels. Finally, we demonstrate that the FUS-induced reductions to ER-mitochondria associations and are linked to activation of glycogen synthase kinase-3β (GSK-3β), a kinase already strongly associated with ALS/FTD.
KW - Amyotrophic lateral sclerosis
KW - Frontotemporal dementia
KW - Glycogen synthase kinase-3β
KW - Protein tyrosine phosphatase interacting protein 51
KW - Vesicle-associated membrane protein-associated protein B
UR - http://www.scopus.com/inward/record.url?scp=84978431619&partnerID=8YFLogxK
U2 - 10.15252/embr.201541726
DO - 10.15252/embr.201541726
M3 - Article
SN - 1469-221X
VL - 17
SP - 1326
EP - 1342
JO - EMBO Reports
JF - EMBO Reports
IS - 9
M1 - e201541726
ER -