Along with neuronal mechanisms devoted to memory consolidation –including long term potentiation of synaptic strength as prominent electrophysiological correlate, and inherent dendritic spines stabilization as structural counterpart– negative control of memory formation and synaptic plasticity has been described at the molecular and behavioral level. Within this work, we report a role for the epigenetic corepressor Lysine Specific Demethylase 1 (LSD1) as a negative neuroplastic factor whose stress-enhanced activity may participate in coping with adverse experiences. Constitutively increasing LSD1 activity via knocking out its dominant negative splicing isoform neuroLSD1 (neuroLSD1KO mice), we observed extensive structural, functional and behavioral signs of excitatory decay, including disrupted memory consolidation. A similar LSD1 increase, obtained with acute antisense oligonucleotide-mediated neuroLSD1 splicing knock down in primary neuronal cultures, dampens spontaneous glutamatergic transmission, reducing mEPSCs. Remarkably, LSD1 physiological increase occurs in response to psychosocial stress-induced glutamatergic signaling. Since this mechanism entails neuroLSD1 splicing downregulation, we conclude that LSD1/neuroLSD1 ratio modulation in the hippocampus is instrumental to a negative homeostatic feedback, restraining glutamatergic neuroplasticity in response to glutamate. The active process of forgetting provides memories with salience. With our work, we propose that softening memory traces of adversities could further represent a stress-coping process in which LSD1/neuroLSD1 ratio modulation may help preserving healthy emotional references.

LSD1 is an environmental stress-sensitive negative modulator of the glutamatergic synapse / A. Longaretti, C. Forastieri, E. Toffolo, L. Caffino, A. Locarno, I. Miseviciute, E. Marchesi, M. Battistin, L. Ponzoni, L. Madaschi, C. Cambria, M.P. Bonasoni, M. Sala, D. Perrone, F. Fumagalli, S. Bassani, F. Antonucci, R. Tonini, M. Francolini, E. Battaglioli, F. Rusconi. - In: NEUROBIOLOGY OF STRESS. - ISSN 2352-2895. - 13(2020 Nov).

LSD1 is an environmental stress-sensitive negative modulator of the glutamatergic synapse

A. Longaretti;C. Forastieri;E. Toffolo;L. Caffino;L. Ponzoni;M. Sala;F. Fumagalli;F. Antonucci;M. Francolini;E. Battaglioli;F. Rusconi
2020-11

Abstract

Along with neuronal mechanisms devoted to memory consolidation –including long term potentiation of synaptic strength as prominent electrophysiological correlate, and inherent dendritic spines stabilization as structural counterpart– negative control of memory formation and synaptic plasticity has been described at the molecular and behavioral level. Within this work, we report a role for the epigenetic corepressor Lysine Specific Demethylase 1 (LSD1) as a negative neuroplastic factor whose stress-enhanced activity may participate in coping with adverse experiences. Constitutively increasing LSD1 activity via knocking out its dominant negative splicing isoform neuroLSD1 (neuroLSD1KO mice), we observed extensive structural, functional and behavioral signs of excitatory decay, including disrupted memory consolidation. A similar LSD1 increase, obtained with acute antisense oligonucleotide-mediated neuroLSD1 splicing knock down in primary neuronal cultures, dampens spontaneous glutamatergic transmission, reducing mEPSCs. Remarkably, LSD1 physiological increase occurs in response to psychosocial stress-induced glutamatergic signaling. Since this mechanism entails neuroLSD1 splicing downregulation, we conclude that LSD1/neuroLSD1 ratio modulation in the hippocampus is instrumental to a negative homeostatic feedback, restraining glutamatergic neuroplasticity in response to glutamate. The active process of forgetting provides memories with salience. With our work, we propose that softening memory traces of adversities could further represent a stress-coping process in which LSD1/neuroLSD1 ratio modulation may help preserving healthy emotional references.
Aging; Alternative splicing; Environmental stress; Epigenetics; Glutamatergic synapse; LSD1/KDM1A; Neuroplasticity; Psychiatric disorders; REST/NRSF;
Settore BIO/13 - Biologia Applicata
Settore BIO/14 - Farmacologia
Settore CHIM/06 - Chimica Organica
Role of LSD1 in aging-dependent epigenetic drift leading to frailty-associated mood disorders
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/2434/807307.3
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