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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 Biochim+Biophys+Acta
2014 ; 1843
(6
): 1162-71
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Modulation of calcium-induced cell death in human neural stem cells by the novel
peptidylarginine deiminase-AIF pathway
#MMPMID24607566
U KP
; Subramanian V
; Nicholas AP
; Thompson PR
; Ferretti P
Biochim Biophys Acta
2014[Jun]; 1843
(6
): 1162-71
PMID24607566
show ga
PADs (peptidylarginine deiminases) are calcium-dependent enzymes that change
protein-bound arginine to citrulline (citrullination/deimination) affecting
protein conformation and function. PAD up-regulation following chick spinal cord
injury has been linked to extensive tissue damage and loss of regenerative
capability. Having found that human neural stem cells (hNSCs) expressed PAD2 and
PAD3, we studied PAD function in these cells and investigated PAD3 as a potential
target for neuroprotection by mimicking calcium-induced secondary injury
responses. We show that PAD3, rather than PAD2 is a modulator of cell
growth/death and that PAD activity is not associated with caspase-3-dependent
cell death, but is required for AIF (apoptosis inducing factor)-mediated
apoptosis. PAD inhibition prevents association of PAD3 with AIF and AIF cleavage
required for its translocation to the nucleus. Finally, PAD inhibition also
hinders calcium-induced cytoskeleton disassembly and association of PAD3 with
vimentin, that we show to be associated also with AIF; together this suggests
that PAD-dependent cytoskeleton disassembly may play a role in AIF translocation
to the nucleus. This is the first study highlighting a role of PAD activity in
balancing hNSC survival/death, identifying PAD3 as an important upstream
regulator of calcium-induced apoptosis, which could be targeted to reduce neural
loss, and shedding light on the mechanisms involved.