Abstract
Apoptotic cell death contributes to neuronal loss in the penumbral region of brain infarction. Activated caspase-3 (ACA-3) cleaves proteins including poly(ADP-ribose) polymerase-1 (PARP-1) important in DNA repair, thus promoting apoptosis. Overactivation of PARP-1 depletes NAD+ and ATP, resulting in necrosis. These cell death phenomena have been investigated mostly in experimental animals. We studied an autopsy cohort of 13 fatal ischemic stroke cases (symptoms 15 h to 18 days) and 2 controls by immunohistochemical techniques. The number of PARP-1 immunoreactive neurons was highest in the periinfarct area. Nuclear PARP-1 correlated with increasing neuronal necrosis (P = 0.013). Cytoplasmic PARP-1 correlated with TUNEL in periinfarct and core areas (P = 0.01). Cytoplasmic cleaved PARP-1 was inversely correlated with increasing necrotic damage (P = 0.001). PAR-polymers were detected in neurons confirming enzymatic activity of PARP-1. Cytoplasmic ACA-3 correlated with death receptor Fas (r s = 0.48; P = 0.005). In conclusion, the confirmation of the same pathways of cell death than previously described in experimental animal models encourages neuroprotective treatments acting on these mediators also in human stroke.
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Abbreviations
- ACA:
-
Activated caspase-3
- AIF:
-
Apoptosis inducing factor
- PARP-1:
-
Poly(ADP-Ribose) polymerase-1
- TUNEL:
-
Terminal deoxynucleotidyl transferase (TdT)-mediated dUTP nick end labeling
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Acknowledgments
The study was financially supported by The Finnish Academy, Sigrid Jusélius Foundation, HUCH governmental subsidiary grants for research (EVO), Päivikki and Sakari Sohlberg Foundation, H. Lundbeck Inc., Maire Taponen Foundation, The Finnish Medical Foundation, Finnish Cultural Foundation and Aarne Koskelo Foundation. The authors thank Ms. Tanja Eriksson and Mrs. Taru Puhakka for skillful technical assistance. This study belongs to a series of post-mortem stroke studies designated collectively as the Helsinki Stroke Study (HSS).
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The authors declare that they have no conflict of interest.
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T. Sairanen and R. Szepesi contributed equally to this study.
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Sairanen, T., Szepesi, R., Karjalainen-Lindsberg, ML. et al. Neuronal caspase-3 and PARP-1 correlate differentially with apoptosis and necrosis in ischemic human stroke. Acta Neuropathol 118, 541–552 (2009). https://doi.org/10.1007/s00401-009-0559-3
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DOI: https://doi.org/10.1007/s00401-009-0559-3