The temporal dynamics of consolidation and reconsolidation decrease during postnatal development.
The temporal dynamics of consolidation and reconsolidation of taste/odor aversion memory are evaluated during rat pup growth at postnatal days 3, 10, and 18. This is assessed through the temporal gradients of efficacy of a protein synthesis inhibitor (anisomycin) in inducing amnesia after either acquisition (consolidation) or reactivation (reconsolidation). The results show a progressive reduction with age of the delay during which the inhibitor is able to induce amnesia. Control experiments rule out a reduction of anisomycin efficacy due to blood brain barrier growth or decrease in protein synthesis inhibition. Thus, these results present the first evidence that the protein synthesis-dependent phase of memory stabilization requires less time with age. This decrease occurs in parallel for consolidation and reconsolidation. Such changes in the dynamics of memory processing could contribute to the cognitive improvement associated with development.
Université Paris-sud, Laboratoire de Neurobiologie de l'Apprentissage, de Mémoire et de Communication, UMR 8620, CNRS, 91405 Orsay, France.
Solène
S
Languille
Nadège
N
Gruest
Paullette
P
Richer
Bernard
B
Hars
D000367:Age Factors; D000647:Amnesia / Q000139:chemically induced; D000818:Animals; D000831:Animals, Newborn; D000841:Anisomycin / Q000008:administration & dosage / Q000009:adverse effects / Q000494:pharmacology*; D003213:Conditioning, Psychological; D004305:Dose-Response Relationship, Drug; D008568:Memory / Q000187:drug effects* / Q000502:physiology*; D011500:Protein Synthesis Inhibitors / Q000008:administration & dosage / Q000009:adverse effects / Q000494:pharmacology*; D051381:Rats; D013997:Time Factors; D014886:Weaning
D011500:Protein Synthesis Inhibitors; D000841:Anisomycin