Abstract:
:Mitochondrial Ca(2+) uptake through the recently discovered Mitochondrial Calcium Uniporter (MCU) is controlled by its gatekeeper Mitochondrial Calcium Uptake 1 (MICU1). However, the physiological and pathological role of MICU1 remains unclear. Here we show that MICU1 is vital for adaptation to postnatal life and for tissue repair after injury. MICU1 knockout is perinatally lethal in mice without causing gross anatomical defects. We used liver regeneration after partial hepatectomy as a physiological stress response model. Upon MICU1 loss, early priming is unaffected, but the pro-inflammatory phase does not resolve and liver regeneration fails, with impaired cell cycle entry and extensive necrosis. Ca(2+) overload-induced mitochondrial permeability transition pore (PTP) opening is accelerated in MICU1-deficient hepatocytes. PTP inhibition prevents necrosis and rescues regeneration. Thus, our study identifies an unanticipated dependence of liver regeneration on MICU1 and highlights the importance of regulating MCU under stress conditions when the risk of Ca(2+) overload is elevated.
journal_name
Nat Communjournal_title
Nature communicationsauthors
Antony AN,Paillard M,Moffat C,Juskeviciute E,Correnti J,Bolon B,Rubin E,Csordás G,Seifert EL,Hoek JB,Hajnóczky Gdoi
10.1038/ncomms10955subject
Has Abstractpub_date
2016-03-09 00:00:00pages
10955issn
2041-1723pii
ncomms10955journal_volume
7pub_type
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