Abstract:
:GDAP1 is an outer mitochondrial membrane protein that acts as a regulator of mitochondrial dynamics. Mutations of the GDAP1 gene cause Charcot-Marie-Tooth (CMT) neuropathy. We show that GDAP1 interacts with the vesicle-organelle trafficking proteins RAB6B and caytaxin, which suggests that GDAP1 may participate in the mitochondrial movement within the cell. GDAP1 silencing in the SH-SY5Y cell line induces abnormal distribution of the mitochondrial network, reduces the contact between mitochondria and endoplasmic reticulum (ER) and alters the mobilization of mitochondria towards plasma membrane upon depletion of ER-Ca(2+) stores. GDAP1 silencing does not affect mitochondrial Ca(2+) uptake, ER-Ca(2+), or Ca(2+) flow from ER to mitochondria, but reduces Ca(2+) inflow through store-operated Ca(2+) entry (SOCE) following mobilization of ER-Ca(2+) and SOCE-driven Ca(2+) entry in mitochondria. Our studies suggest that the pathophysiology of GDAP1-related CMT neuropathies may be associated with abnormal distribution and movement of mitochondria throughout cytoskeleton towards the ER and subplasmalemmal microdomains, resulting in a decrease in SOCE activity and impaired SOCE-driven Ca(2+) uptake in mitochondria.
journal_name
Neurobiol Disjournal_title
Neurobiology of diseaseauthors
Pla-Martín D,Rueda CB,Estela A,Sánchez-Piris M,González-Sánchez P,Traba J,de la Fuente S,Scorrano L,Renau-Piqueras J,Alvarez J,Satrústegui J,Palau Fdoi
10.1016/j.nbd.2013.03.010subject
Has Abstractpub_date
2013-07-01 00:00:00pages
140-51eissn
0969-9961issn
1095-953Xpii
S0969-9961(13)00098-3journal_volume
55pub_type
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