EN
Poly(ADP-ribose) polymerase-1 (PARP-1) is a nuclear enzyme involved in DNA repair and transcription regulation. The aim of this study was to investigate the role of PARP-1 in muscarinic cholinergic receptor signaling. Our data indicate that activation of muscarinic cholinergic receptors by carbachol (1mM) in the presence of GTPS evoked a significant enhancement of PARP activity in the adult rat hippocampus. Moreover, TMB-8 (10µM), an antagonist of inositol 1, 4, 5 trisphosphate (IP3) receptor prevented the activation of PARP-1, which indicates that IP3 /Ca2+ signaling is involved in this pathway. The diacylglycerol (DAG)-regulated protein kinase C (PKC) inhibitor (GF109203X) (1µM) only slightly enhanced PARP activity in hippocampal nuclear fractions, which suggests that DAG/ PKC is not involved in PARP activation.