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The Journal of Experimental Biology 206, 1605-1613 (2003)
doi: 10.1242/jeb.00301

Intermediate and long-term memories of associative learning are differentially affected by transcription versus translation blockers inLymnaea

Susan Sangha, Andi Scheibenstock, Chloe McComb and Ken Lukowiak^*

Department of Medical Physiology and Biophysics, Neuroscience Research Group, 3330 Hospital Drive NW, University of Calgary, Calgary, Alberta T2N 4N1, Canada

^* Author for correspondence (e-mail: lukowiak{at}ucalgary.ca)

Accepted 18 February 2003

Aerial respiratory behaviour in the pond snail, Lymnaea stagnalis, can be operantly conditioned. This associative learning then undergoes consolidation into a long-lasting memory which, depending on the training procedure used, causes intermediate-term memory (ITM; lasting 3 h) or long-term memory (LTM; lasting >6 h) to be formed. We determined the differential susceptibility of these two forms of memory to translation and transcription blockers. The injection of a translation blocker, Anisomycin, 2.5 h before training prevents the establishment of both ITM and LTM. On the other hand, injection of the transcription blocker Actinomycin D, 2.5 h before training, did not prevent the establishment of ITM, but did, however, prevent LTM formation. Thus in Lymnaea, following associative learning, both ITM and LTM are dependent on new protein synthesis. ITM appears to be dependent on protein synthesis from preexisting transcription factors, whilst LTM is dependent on protein synthesis from new transcription messages.

Key words: Lymnaea stagnalis, intermediate memory, long-term memory, protein synthesis, associative learning

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