INVESTIGADORES
BEKINSCHTEIN Pedro Alejandro
artículos
Título:
mTOR signaling in the hippocampus is necessary for memory formation
Autor/es:
PEDRO BEKINSCHTEIN; CYNTHIA KATCHE; LEANDRO N. SLIPCZUK; LIONEL MÜLLER IGAZ; MARTÍN CAMMAROTA; IVAN IZQUIERDO; JORGE H. MEDINA
Revista:
NEUROBIOLOGY OF LEARNING AND MEMORY
Editorial:
Elsevier Inc.
Referencias:
Lugar: Orlando, FLorida; Año: 2007 vol. 87 p. 303 - 307
ISSN:
1074-7427
Resumen:
It is widely accepted that the formation of long-term memory (LTM)
requires mRNA translation, but little is known about the cellular
mechanisms in the brain that regulate this process. Mammalian target of
rapamycin (mTOR) is a key regulator of translational efficacy and
capacity. Here, we show that LTM formation of one-trial inhibitory
avoidance (IA) in rats, a hippocampus-dependent fear-motivated learning
task, requires mTOR activation. IA training is specifically associated
with a rapid increase in the phosphorylation state of mTOR and its
substrate ribosomal S6 kinase (p70S6K). Bilateral intra-CA1 infusion of
rapamycin, a selective mTOR inhibitor, 15 min before, but not
immediately after training completely hinders IA LTM without affecting
short-term memory (STM) retention. Therefore, our findings indicate
that the regulation of hippocampal mRNA translation is a major control
step in memory consolidation.