Abstract
The involvement of protein kinases A and C in the induction of low frequency stimulation-induced long-term depression (LTD) in the medial perforant path of the dentate gyrus in vitro has been studied using the selective PKA inhibitors H-89 and KT 5720 and PKC inhibitors Bisindolylmaleimide and Ro-31-8220. The PKC inhibitors Bisindolylmaleimide I and Ro-31-8220 and the PKA inhibitors H-89 and KT5720 all partially inhibited LTD induction. However, the presence of both a PKC and a PKA inhibitor was necessary to completely block LTD induction. The induction of long-term potentiation was not blocked by the inhibitors. It is suggested that the induction of LTD by LFS involves activation of PKC and PKA following activation of group I and group II metabotropic glutamate receptors (mGluR).
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