Neuromodulatory action of picomolar extracellular Aβ42 oligomers on presynaptic and postsynaptic mechanisms underlying synaptic function and memory

Walter Gulisano, Marcello Melone, Cristian Ripoli, Maria Rosaria Tropea, Domenica D. Li Puma, Salvatore Giunta, Sara Cocco, Daniele Marcotulli, Nicola Origlia, Agostino Palmeri, Ottavio Arancio, Fiorenzo Conti, Claudio Grassi, Daniela Puzzo

Research output: Contribution to journalArticle

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Abstract

Failure of anti-amyloid-β peptide (Aβ) therapies against Alzheimer’s disease (AD), a neurodegenerative disorder characterized by high amounts of the peptide in the brain, raised the question of the physiological role of Aβ released at low concentrations in the healthy brain. To address this question, we studied the presynaptic and postsynaptic mechanisms underlying the neuromodulatory action of picomolar amounts of oligomeric Aβ42 (oAβ42) on synaptic glutamatergic function in male and female mice. We found that 200 pM oAβ42 induces an increase of frequency of miniature EPSCs and a decrease of paired pulse facilitation, associated with an increase in docked vesicle number, indicating that it augments neurotransmitter release at presynaptic level. oAβ42 also produced postsynaptic changes as shown by an increased length of postsynaptic density, accompanied by an increased expression of plasticity-related proteins such as cAMP-responsive element binding protein phosphorylated at Ser133, calcium-calmodulin-dependent kinase II phosphorylated at Thr286, and brain-derived neurotrophic factor, suggesting a role for Aβ in synaptic tagging. These changes resulted in the conversion of early into late long-term potentiation through the nitric oxide/cGMP/protein kinase G intracellular cascade consistent with a cGMP-dependent switch from short-to long-term memory observed in vivo after intrahippocampal administration of picomolar amounts of oAβ42. These effects were present upon extracellular but not intracellular application of the peptide and involved +7 nicotinic acetylcholine receptors. These observations clarified the physiological role of oAβ42 in synaptic function and memory formation providing solid fundamentals for investigating the pathological effects of high Aβ levels in the AD brains.

Original languageEnglish
Pages (from-to)5986-6000
Number of pages15
JournalJournal of Neuroscience
Volume39
Issue number30
DOIs
Publication statusPublished - Jul 24 2019

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Alzheimer Disease
Brain
Post-Synaptic Density
Cyclic GMP-Dependent Protein Kinases
Calcium-Calmodulin-Dependent Protein Kinases
Peptides
Long-Term Memory
Long-Term Potentiation
Brain-Derived Neurotrophic Factor
Nicotinic Receptors
Amyloid
Neurodegenerative Diseases
Neurotransmitter Agents
Carrier Proteins
Nitric Oxide
Calcium
Proteins
Therapeutics
peptide A

Keywords

  • Amyloid precursor protein
  • Amyloid-beta oligomers
  • Neurotransmitter release
  • Nicotinic receptors
  • Synaptic plasticity
  • Synaptic transmission

ASJC Scopus subject areas

  • Neuroscience(all)

Cite this

Neuromodulatory action of picomolar extracellular Aβ42 oligomers on presynaptic and postsynaptic mechanisms underlying synaptic function and memory. / Gulisano, Walter; Melone, Marcello; Ripoli, Cristian; Tropea, Maria Rosaria; Li Puma, Domenica D.; Giunta, Salvatore; Cocco, Sara; Marcotulli, Daniele; Origlia, Nicola; Palmeri, Agostino; Arancio, Ottavio; Conti, Fiorenzo; Grassi, Claudio; Puzzo, Daniela.

In: Journal of Neuroscience, Vol. 39, No. 30, 24.07.2019, p. 5986-6000.

Research output: Contribution to journalArticle

Gulisano, Walter ; Melone, Marcello ; Ripoli, Cristian ; Tropea, Maria Rosaria ; Li Puma, Domenica D. ; Giunta, Salvatore ; Cocco, Sara ; Marcotulli, Daniele ; Origlia, Nicola ; Palmeri, Agostino ; Arancio, Ottavio ; Conti, Fiorenzo ; Grassi, Claudio ; Puzzo, Daniela. / Neuromodulatory action of picomolar extracellular Aβ42 oligomers on presynaptic and postsynaptic mechanisms underlying synaptic function and memory. In: Journal of Neuroscience. 2019 ; Vol. 39, No. 30. pp. 5986-6000.
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AU - Tropea, Maria Rosaria

AU - Li Puma, Domenica D.

AU - Giunta, Salvatore

AU - Cocco, Sara

AU - Marcotulli, Daniele

AU - Origlia, Nicola

AU - Palmeri, Agostino

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