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- W2078362754 abstract "Recent studies have implicated Ras signalling in synaptic plasticity. In this study we have investigated a role for the low molecular weight G proteins Ras, Rap, Ra1 and Rac in long-term potentiation and depression using Clostridium Sordelli Lethal Toxin-82 (LT-82), which inactivates Ras, Rap, Ra1 and Rac, and manumycin A, a Ras inhibitor. Perfusion of hippocampal slices with LT-82 (200 ng/ml) attenuated LTP (83±10%, n=5, P<0.01, compared with controls of 160±11% at 60 min post HFS, n=5). LT-82 had no effect on LTD (63±1% at 100 ng/ml, n=5 and 66±1% at 200 ng/ml, n=4, compared to controls of 56±6%, n=6). Manumycin A (2μM) had no effect on LTP (162±2%, n=5, compared to controls of 167±13%, n=5), but significantly attenuated LTD (88±6%, n=5, P<0.01, compared to controls of 63±9%, n=7). LT-82 (200 ng/ml) significantly increased the amplitude of the isolated NMDA-EPSP at 60 min post-drug application (240±40%, n=5, P<0.01, compared with controls of 100±4%, n=5). However, manumycin A, had no significant effect on NMDAR-EPSP amplitude (92±2%, n=5, compared with controls). These results demonstrate an important role for Ras in LTD and a role for Rap, Ra1 and Rac in LTP." @default.
- W2078362754 created "2016-06-24" @default.
- W2078362754 creator A5004599362 @default.
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- W2078362754 date "2004-03-01" @default.
- W2078362754 modified "2023-09-26" @default.
- W2078362754 title "A role for monomeric G-proteins in synaptic plasticity in the rat dentate gyrus in vitro" @default.
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- W2078362754 doi "https://doi.org/10.1016/j.brainres.2003.11.044" @default.
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