Poly(ADP-ribosyl)ation basally activated by DNA strand breaks reflects glutamate-nitric oxide neurotransmission.
Poly(ADP-ribose) polymerase (PARP) transfers ADP ribose groups from NAD(+) to nuclear proteins after activation by DNA strand breaks. PARP overactivation by massive DNA damage causes cell death via NAD(+) and ATP depletion. Heretofore, PARP has been thought to be inactive under basal physiologic conditions. We now report high basal levels of PARP activity and DNA strand breaks in discrete neuronal populations of the brain, in ventricular ependymal and subependymal cells and in peripheral tissues. In some peripheral tissues, such as skeletal muscle, spleen, heart, and kidney, PARP activity is reduced only partially in mice with PARP-1 gene deletion (PARP-1(-/-)), implicating activity of alternative forms of PARP. Glutamate neurotransmission involving N-methyl-d-aspartate (NMDA) receptors and neuronal nitric oxide synthase (nNOS) activity in part mediates neuronal DNA strand breaks and PARP activity, which are diminished by NMDA antagonists and NOS inhibitors and also diminished in mice with targeted deletion of nNOS gene (nNOS(-/-)). An increase in NAD(+) levels after treatment with NMDA antagonists or NOS inhibitors, as well as in nNOS(-/-) mice, indicates that basal glutamate-PARP activity regulates neuronal energy dynamics.
Pieper
A A
AA
Departments of Neuroscience, Johns Hopkins University School of Medicine, 725 North Wolfe Street, Baltimore, MD 21205, USA.
Blackshaw
S
S
Clements
E E
EE
Brat
D J
DJ
Krug
D K
DK
White
A J
AJ
Pinto-Garcia
P
P
Favit
A
A
Conover
J R
JR
Snyder
S H
SH
Verma
A
A
D000818:Animals; D001345:Autoradiography; D001921:Brain / Q000378:metabolism*; D002478:Cells, Cultured; D004249:DNA Damage / Q000235:genetics*; D004789:Enzyme Activation; D018698:Glutamic Acid / Q000378:metabolism*; D007150:Immunohistochemistry; D007668:Kidney / Q000378:metabolism; D051379:Mice; D018345:Mice, Knockout; D016202:N-Methylaspartate / Q000378:metabolism; D009243:NAD / Q000378:metabolism; D009569:Nitric Oxide / Q000378:metabolism*; D000071137:Poly (ADP-Ribose) Polymerase-1; D011064:Poly Adenosine Diphosphate Ribose / Q000378:metabolism; D011065:Poly(ADP-ribose) Polymerases; D011506:Proteins / Q000235:genetics* / Q000378:metabolism; D016194:Receptors, N-Methyl-D-Aspartate / Q000037:antagonists & inhibitors; D014443:Tyrosine / Q000031:analogs & derivatives / Q000378:metabolism
D011506:Proteins; D016194:Receptors, N-Methyl-D-Aspartate; D009243:NAD; D011064:Poly Adenosine Diphosphate Ribose; D009569:Nitric Oxide; C002744:3-nitrotyrosine; D018698:Glutamic Acid; D014443:Tyrosine; D016202:N-Methylaspartate; C499321:Parp1 protein, mouse; D000071137:Poly (ADP-Ribose) Polymerase-1; D011065:Poly(ADP-ribose) Polymerases