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Graf Isolan
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Untersuchte Arbeit:
Seite: 18, Zeilen: 20-26
Quelle: Sajikumar 2005
Seite(n): 22, Zeilen: 9-22
This selective enhancement of conjointly activated synaptic inputs is often considered as a cellular analog correlate of associative or classical conditioning. Otherways, associativity is expected in any network of neurons that links one set information with another. ‘Late-associativity’ is a novel property of LTP, which describes intersynaptic interventions within a time frame of few minutes to few hours (Frey and Morris, 1997, 1998a, 1998b). More clearly, a weak protein synthesis-independent early-LTP in one synaptic input can be [transformed into a late, protein synthesis-dependent form, if a protein synthesis-dependent late-LTP is induced in the second synaptic input preceded by the weak events in the first synaptic input (“Weak before strong”) within a specific time frame (Frey and Morris, 1998a, 1998b; Frey , 2001 ; Frey and Frey, 2008; Kauderer and Kandel, 2000; Sajikumar and Frey, 2004a).]

• Frey U, Frey S, Schollmeier F, Krug M (1995) Influence of actinomycin D, a RNA synthesis inhibitor, on long-term potentiation in rat hippocampal neurons in vivo and in vitro. J Physiol 490:703-711

• Frey U, Morris RGM (1997) Synaptic tagging and long-term potentiation. Nature 385:533-536.

• Frey U, Morris RGM (1998a) Synaptic tagging: implications for late maintenance of hippocampal long-term potentiation. Trends Neurosci 21:181-188.

• Frey U, Morris RGM (1998b) Weak before strong: dissociating synaptic tagging and plasticity-factor accounts for late-LTP. Neuropharmacology 37:545-552.

• Frey S, Bergado-Rosado J, Seidenbecher T, Pape HC, Frey JU (2001) Reinforcement of early long-term potentiation (early-LTP) in dentate gyrus by stimulation of the basolateral amygdala: heterosynaptic induction mechanisms of late-LTP. J Neurosci 21:3697-3703.

• Kauderer BS, Kandel ER (2000) Capture of a protein synthesis-dependent component of long-term depression. Proc Natl Acad Sci U S A.97:13342-7.

• Sajikumar S, Frey JU (2004) Resetting of synaptic tags is time-and activity-dependent in rat hippocampal CA1 in vitro. Neuroscience 129:503-507.

• Sajikumar S, Frey JU (2004) Late-associativity, synaptic tagging, and the role of dopamine during LTP and LTD. Neurobiol Learn Mem 82:12-25.

This selective enhancement /depression of conjointly activated sets of synaptic inputs is often considered as a cellular analog of associative or classical conditioning. More generally, associativity is expected in any network of neurons that links one set of information with another.

Late-associativity is a novel property of LTP/LTD. It describes intersynaptic interventions within a time frame of few minutes to few hours (Frey and Morris, 1997;Frey and Morris, 1998a;Frey and Morris, 1998b;Morris and Frey, 1999). More clearly, a weak protein synthesis independent early-LTP/-LTD in one synaptic input can be transformed into a late, protein synthesis-dependent form, if a protein synthesis-dependent late-LTP/-LTD is induced in the second synaptic input preceded by the weak events in the first synaptic input (weak before strong) within a specific time frame (Frey and Morris, 1998b;Kauderer and Kandel, 2000).


Frey U, Morris RG (1997) Synaptic tagging and long-term potentiation. Nature 385: 533-536.

Frey U, Morris RG (1998a) Synaptic tagging: implications for late maintenance of hippocampal long-term potentiation. Trends Neurosci 21: 181-188.

Frey U, Morris RG (1998b) Weak before strong: dissociating synaptic tagging and plasticity-factor accounts of late-LTP. Neuropharmacology 37: 545-552.

Kauderer BS, Kandel ER (2000) Capture of a protein synthesis-dependent component of long-term depression. Proc Natl Acad Sci U S A 97: 13342-13347.

Morris RG, Frey U (1999) Tagging the hebb synapse: reply. Trends Neurosci 22: 256.

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