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Martínez San Segundo P, Terni B, Llobet A. Multivesicular release favors short term synaptic depression in hippocampal autapses. Front Cell Neurosci 2023; 17:1057242. [PMID: 37265578 PMCID: PMC10230035 DOI: 10.3389/fncel.2023.1057242] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/29/2022] [Accepted: 04/10/2023] [Indexed: 06/03/2023] Open
Abstract
Presynaptic terminals of the central nervous system can support univesicular and multivesicular synchronous release of neurotransmitters, however, the functional implications of the prevalence of one mechanism over the other are yet unresolved. Here, we took advantage of the expression of SF-iGluSnFR.S72A in the astrocytic feeder layer of autaptic hippocampal neuronal cultures to associate the liberation of glutamate to excitatory postsynaptic currents. The presence of the glutamate sensor in glial cells avoided any interference with the function of endogenous postsynaptic receptors. It was possible to optically detect changes in neurotransmitter release probability, which was heterogeneous among synaptic boutons studied. For each neuron investigated, the liberation of neurotransmitters occurred through a predominant mechanism. The prevalence of multivesicular over univesicular release increased synaptic strength and enhanced short-term synaptic depression. These results show that the preference of hippocampal boutons to synchronously release one or more vesicles determines the strength and low pass filtering properties of the synapses established.
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Affiliation(s)
- Pablo Martínez San Segundo
- Laboratory of Neurobiology, Department of Pathology and Experimental Therapy, Institute of Neurosciences, University of Barcelona, Barcelona, Spain
- Bellvitge Biomedical Research Institute (IDIBELL), Barcelona, Spain
| | - Beatrice Terni
- Laboratory of Neurobiology, Department of Pathology and Experimental Therapy, Institute of Neurosciences, University of Barcelona, Barcelona, Spain
- Bellvitge Biomedical Research Institute (IDIBELL), Barcelona, Spain
| | - Artur Llobet
- Laboratory of Neurobiology, Department of Pathology and Experimental Therapy, Institute of Neurosciences, University of Barcelona, Barcelona, Spain
- Bellvitge Biomedical Research Institute (IDIBELL), Barcelona, Spain
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2
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Gao L, Meiring JCM, Varady A, Ruider IE, Heise C, Wranik M, Velasco CD, Taylor JA, Terni B, Weinert T, Standfuss J, Cabernard CC, Llobet A, Steinmetz MO, Bausch AR, Distel M, Thorn-Seshold J, Akhmanova A, Thorn-Seshold O. In Vivo Photocontrol of Microtubule Dynamics and Integrity, Migration and Mitosis, by the Potent GFP-Imaging-Compatible Photoswitchable Reagents SBTubA4P and SBTub2M. J Am Chem Soc 2022; 144:5614-5628. [PMID: 35290733 PMCID: PMC8972266 DOI: 10.1021/jacs.2c01020] [Citation(s) in RCA: 20] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Abstract
Photoswitchable reagents are powerful tools for high-precision studies in cell biology. When these reagents are globally administered yet locally photoactivated in two-dimensional (2D) cell cultures, they can exert micron- and millisecond-scale biological control. This gives them great potential for use in biologically more relevant three-dimensional (3D) models and in vivo, particularly for studying systems with inherent spatiotemporal complexity, such as the cytoskeleton. However, due to a combination of photoswitch isomerization under typical imaging conditions, metabolic liabilities, and insufficient water solubility at effective concentrations, the in vivo potential of photoswitchable reagents addressing cytosolic protein targets remains largely unrealized. Here, we optimized the potency and solubility of metabolically stable, druglike colchicinoid microtubule inhibitors based on the styrylbenzothiazole (SBT) scaffold that are nonresponsive to typical fluorescent protein imaging wavelengths and so enable multichannel imaging studies. We applied these reagents both to 3D organoids and tissue explants and to classic model organisms (zebrafish, clawed frog) in one- and two-protein imaging experiments, in which spatiotemporally localized illuminations allowed them to photocontrol microtubule dynamics, network architecture, and microtubule-dependent processes in vivo with cellular precision and second-level resolution. These nanomolar, in vivo capable photoswitchable reagents should open up new dimensions for high-precision cytoskeleton research in cargo transport, cell motility, cell division, and development. More broadly, their design can also inspire similarly capable optical reagents for a range of cytosolic protein targets, thus bringing in vivo photopharmacology one step closer to general realization.
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Affiliation(s)
- Li Gao
- Department of Pharmacy, Ludwig-Maximilians University of Munich, Munich 81377, Germany
| | - Joyce C M Meiring
- Cell Biology, Neurobiology and Biophysics, Department of Biology, Faculty of Science, Utrecht University, Utrecht CH 3584, Netherlands
| | - Adam Varady
- St. Anna Children's Cancer Research Institute (CCRI), Vienna 1090, Austria
| | - Iris E Ruider
- Physics Department and Center for Protein Assemblies CPA, Technical University of Munich, Garching 85747, Germany
| | - Constanze Heise
- Department of Pharmacy, Ludwig-Maximilians University of Munich, Munich 81377, Germany
| | - Maximilian Wranik
- Laboratory of Biomolecular Research, Division of Biology and Chemistry, Paul Scherrer Institut, Villigen 5232, Switzerland
| | - Cecilia D Velasco
- Laboratory of Neurobiology, Department of Pathology and Experimental Therapy, Institute of Neurosciences, University of Barcelona, L'Hospitalet de Llobregat, Barcelona 08907, Spain.,Bellvitge Biomedical Research Institute (IDIBELL), L'Hospitalet de Llobregat, Barcelona 08907, Spain
| | - Jennifer A Taylor
- Department of Biology, University of Washington, Seattle, Washington 98195, United States
| | - Beatrice Terni
- Laboratory of Neurobiology, Department of Pathology and Experimental Therapy, Institute of Neurosciences, University of Barcelona, L'Hospitalet de Llobregat, Barcelona 08907, Spain.,Bellvitge Biomedical Research Institute (IDIBELL), L'Hospitalet de Llobregat, Barcelona 08907, Spain
| | - Tobias Weinert
- Laboratory of Biomolecular Research, Division of Biology and Chemistry, Paul Scherrer Institut, Villigen 5232, Switzerland
| | - Jörg Standfuss
- Laboratory of Biomolecular Research, Division of Biology and Chemistry, Paul Scherrer Institut, Villigen 5232, Switzerland
| | - Clemens C Cabernard
- Department of Biology, University of Washington, Seattle, Washington 98195, United States
| | - Artur Llobet
- Laboratory of Neurobiology, Department of Pathology and Experimental Therapy, Institute of Neurosciences, University of Barcelona, L'Hospitalet de Llobregat, Barcelona 08907, Spain.,Bellvitge Biomedical Research Institute (IDIBELL), L'Hospitalet de Llobregat, Barcelona 08907, Spain
| | - Michel O Steinmetz
- Laboratory of Biomolecular Research, Division of Biology and Chemistry, Paul Scherrer Institut, Villigen 5232, Switzerland.,Biozentrum, University of Basel, Basel 4056, Switzerland
| | - Andreas R Bausch
- Physics Department and Center for Protein Assemblies CPA, Technical University of Munich, Garching 85747, Germany
| | - Martin Distel
- St. Anna Children's Cancer Research Institute (CCRI), Vienna 1090, Austria.,Zebrafish Platform Austria for Preclinical Drug Screening (ZANDR), Vienna 1090, Austria
| | - Julia Thorn-Seshold
- Department of Pharmacy, Ludwig-Maximilians University of Munich, Munich 81377, Germany
| | - Anna Akhmanova
- Cell Biology, Neurobiology and Biophysics, Department of Biology, Faculty of Science, Utrecht University, Utrecht CH 3584, Netherlands
| | - Oliver Thorn-Seshold
- Department of Pharmacy, Ludwig-Maximilians University of Munich, Munich 81377, Germany
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3
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Terni B, Llobet A. Axon terminals control endolysosome diffusion to support synaptic remodelling. Life Sci Alliance 2021; 4:4/8/e202101105. [PMID: 34226200 PMCID: PMC8321675 DOI: 10.26508/lsa.202101105] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/22/2021] [Revised: 06/14/2021] [Accepted: 06/15/2021] [Indexed: 11/27/2022] Open
Abstract
Endolysosomes present in the presynaptic terminal move by diffusion constrained by F-actin and increase their mobility during the remodelling of synaptic connectivity to support a local degradative activity. Endolysosomes are acidic organelles formed by the fusion of endosomes with lysosomes. In the presynaptic compartment they contribute to protein homeostasis, the maintenance of vesicle pools and synaptic stability. Here, we evaluated the mobility of endolysosomes found in axon terminals of olfactory sensory neurons of Xenopus tropicalis tadpoles. F-actin restricts the motion of these presynaptic acidic organelles which is characterized by a diffusion coefficient of 6.7 × 10−3 μm2·s−1. Local injection of secreted protein acidic and rich in cysteine (SPARC) in the glomerular layer of the olfactory bulb disrupts the structure of synaptic F-actin patches and increases the presence and mobility of endolysosomal organelles found in axon terminals. The increased motion of endolysosomes is localized to the presynaptic compartment and does not promote their access to axonal regions for retrograde transportation to the cell body. Local activation of synaptic degradation mechanisms mediated by SPARC coincides with a loss of the ability of tadpoles to detect waterborne odorants. Together, these observations show that the diffusion of presynaptic endolysosomes increases during conditions of synaptic remodelling to support their local degradative activity.
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Affiliation(s)
- Beatrice Terni
- Department of Pathology and Experimental Therapy, School of Medicine, Institute of Neurosciences, University of Barcelona, Barcelona, Spain .,Laboratory of Neurobiology, Bellvitge Biomedical Research Institute (IDIBELL), Barcelona, Spain
| | - Artur Llobet
- Department of Pathology and Experimental Therapy, School of Medicine, Institute of Neurosciences, University of Barcelona, Barcelona, Spain .,Laboratory of Neurobiology, Bellvitge Biomedical Research Institute (IDIBELL), Barcelona, Spain
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Martínez San Segundo P, Terni B, Burgueño J, Monroy X, Dordal A, Merlos M, Llobet A. Outside-in regulation of the readily releasable pool of synaptic vesicles by α2δ-1. FASEB J 2019; 34:1362-1377. [PMID: 31914622 DOI: 10.1096/fj.201901551r] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/25/2019] [Revised: 10/09/2019] [Accepted: 10/23/2019] [Indexed: 12/17/2022]
Abstract
The readily releasable pool (RRP) of synaptic vesicles is a key determinant of phasic neurotransmission. Although the size of the RRP is tightly regulated by intracellular factors, there is little evidence for its modification by extracellular signals. By studying the homogeneous population of synapses present in autaptic microcultures, we show that pregabalin, a prototypical gabapentinoid, decreases the effective RRP size. Simultaneous imaging of presynaptic calcium influx and recording of postsynaptic responses shows that the effect is not related to a reduction of calcium entry. The main cause is the impairment of the functional coupling among N-type calcium channels and the RRP, resembling an increase of intracellular mobile calcium buffers. The ectodomain of neurexin-1α shows a similar action to pregabalin, acting as an endogenous ligand of α2δ-1 that reduces the RRP size without affecting presynaptic calcium influx. The regulatory actions described for pregabalin and the ectodomain of neurexin-1α are mutually exclusive. The overexpression of α2δ-1 enhances the effect of pregabalin and the ectodomain of neurexin-1α on neurotransmission by decreasing their effective concentration. In contrast, knockdown of α2δ-1 causes a profound inhibition of synaptic transmission. These observations prompt to consider α2δ-1 as an outside-in signaling platform that binds exogenous and endogenous cues for regulating the coupling of voltage-gated calcium channels to synaptic vesicles.
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Affiliation(s)
- Pablo Martínez San Segundo
- Laboratory of Neurobiology, Bellvitge Biomedical Research Institute (IDIBELL), Barcelona, Spain.,Department of Pathology and Experimental Therapeutics, School of Medicine, Institute of Neurosciences, University of Barcelona, Barcelona, Spain
| | - Beatrice Terni
- Laboratory of Neurobiology, Bellvitge Biomedical Research Institute (IDIBELL), Barcelona, Spain.,Department of Pathology and Experimental Therapeutics, School of Medicine, Institute of Neurosciences, University of Barcelona, Barcelona, Spain
| | - Javier Burgueño
- Department of Pharmacology, Drug Discovery and Preclinical Development, ESTEVE, Barcelona, Spain
| | - Xavier Monroy
- Department of Pharmacology, Drug Discovery and Preclinical Development, ESTEVE, Barcelona, Spain
| | - Albert Dordal
- Department of Pharmacology, Drug Discovery and Preclinical Development, ESTEVE, Barcelona, Spain
| | - Manuel Merlos
- Department of Pharmacology, Drug Discovery and Preclinical Development, ESTEVE, Barcelona, Spain
| | - Artur Llobet
- Laboratory of Neurobiology, Bellvitge Biomedical Research Institute (IDIBELL), Barcelona, Spain.,Department of Pathology and Experimental Therapeutics, School of Medicine, Institute of Neurosciences, University of Barcelona, Barcelona, Spain
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Abstract
Xenopus tadpoles offer a unique platform to investigate the function of the nervous system. They provide multiple experimental advantages, such as accessibility to numerous imaging approaches, electrophysiological techniques and behavioral assays. The Xenopus tadpole olfactory system is particularly well suited to investigate the function of synapses established during normal development or reformed after injury. Here, we describe methodologies to evaluate the processing of olfactory information in living Xenopus larvae. We outline a combination of in vivo measurements of presynaptic calcium responses in glomeruli of the olfactory bulb with olfactory-guided behavior assays. Methods can be combined with the transection of olfactory nerves to study the rewiring of synaptic connectivity. Experiments are presented using both wild-type and genetically modified animals expressing GFP reporters in central nervous system cells. Application of the approaches described to genetically modified tadpoles can be useful for unraveling the molecular bases that define vertebrate behavior.
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Affiliation(s)
- Beatrice Terni
- Laboratory of Neurobiology, Neuroscience Program, Bellvitge Biomedical Research Institute (IDIBELL), L'Hospitalet de Llobregat; Department of Pathology and Experimental Therapy, School of Medicine, University of Barcelona, L'Hospitalet de Llobregat; Institute of Neurosciences, University of Barcelona, L'Hospitalet de Llobregat
| | - Paolo Pacciolla
- Laboratory of Neurobiology, Neuroscience Program, Bellvitge Biomedical Research Institute (IDIBELL), L'Hospitalet de Llobregat; Department of Pathology and Experimental Therapy, School of Medicine, University of Barcelona, L'Hospitalet de Llobregat; Institute of Neurosciences, University of Barcelona, L'Hospitalet de Llobregat
| | - Margalida Perelló
- Laboratory of Neurobiology, Neuroscience Program, Bellvitge Biomedical Research Institute (IDIBELL), L'Hospitalet de Llobregat; Department of Pathology and Experimental Therapy, School of Medicine, University of Barcelona, L'Hospitalet de Llobregat; Institute of Neurosciences, University of Barcelona, L'Hospitalet de Llobregat
| | - Artur Llobet
- Laboratory of Neurobiology, Neuroscience Program, Bellvitge Biomedical Research Institute (IDIBELL), L'Hospitalet de Llobregat; Department of Pathology and Experimental Therapy, School of Medicine, University of Barcelona, L'Hospitalet de Llobregat; Institute of Neurosciences, University of Barcelona, L'Hospitalet de Llobregat;
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Terni B, Pacciolla P, Masanas H, Gorostiza P, Llobet A. Tight temporal coupling between synaptic rewiring of olfactory glomeruli and the emergence of odor-guided behavior in Xenopus tadpoles. J Comp Neurol 2017; 525:3769-3783. [PMID: 28815589 DOI: 10.1002/cne.24303] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/02/2017] [Revised: 08/09/2017] [Accepted: 08/10/2017] [Indexed: 12/13/2022]
Abstract
Olfactory sensory neurons (OSNs) are chemoreceptors that establish excitatory synapses within glomeruli of the olfactory bulb. OSNs undergo continuous turnover throughout life, causing the constant replacement of their synaptic contacts. Using Xenopus tadpoles as an experimental system to investigate rewiring of glomerular connectivity, we show that novel OSN synapses can transfer information immediately after formation, mediating olfactory-guided behavior. Tadpoles recover the ability to detect amino acids 4 days after bilateral olfactory nerve transection. Restoration of olfactory-guided behavior depends on the efficient reinsertion of OSNs to the olfactory bulb. Presynaptic terminals of incipient synaptic contacts generate calcium transients in response to odors, triggering long lasting depolarization of olfactory glomeruli. The functionality of reconnected terminals relies on well-defined readily releasable and cytoplasmic vesicle pools. The continuous growth of non-compartmentalized axonal processes provides a vesicle reservoir to nascent release sites, which contrasts to the gradual development of cytoplasmic vesicle pools in conventional excitatory synapses. The immediate availability of fully functional synapses upon formation supports an age-independent contribution of OSNs to the generation of odor maps.
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Affiliation(s)
- Beatrice Terni
- Laboratory of Neurobiology, Department of Pathology and Experimental Therapeutics, Faculty of Medicine, University of Barcelona, Barcelona, Spain.,Bellvitge Biomedical Research Institute (IDIBELL), Barcelona, Spain
| | - Paolo Pacciolla
- Laboratory of Neurobiology, Department of Pathology and Experimental Therapeutics, Faculty of Medicine, University of Barcelona, Barcelona, Spain.,Bellvitge Biomedical Research Institute (IDIBELL), Barcelona, Spain
| | - Helena Masanas
- Bellvitge Biomedical Research Institute (IDIBELL), Barcelona, Spain.,Institut de Bioenginyeria de Catalunya (IBEC), Barcelona, Spain
| | - Pau Gorostiza
- Institut de Bioenginyeria de Catalunya (IBEC), Barcelona, Spain.,Institució Catalana de Recerca i Estudis Avançats (ICREA), Barcelona, Spain.,Network Biomedic Research Center in Biophysics, Bioengineering and Nanomedicine (CIBER-bbn), Madrid, Spain
| | - Artur Llobet
- Laboratory of Neurobiology, Department of Pathology and Experimental Therapeutics, Faculty of Medicine, University of Barcelona, Barcelona, Spain.,Bellvitge Biomedical Research Institute (IDIBELL), Barcelona, Spain.,Institute of Neurosciences, University of Barcelona, Barcelona, Spain
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Terni B, López-Murcia FJ, Llobet A. Role of neuron-glia interactions in developmental synapse elimination. Brain Res Bull 2016; 129:74-81. [PMID: 27601093 DOI: 10.1016/j.brainresbull.2016.08.017] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/02/2016] [Revised: 08/19/2016] [Accepted: 08/31/2016] [Indexed: 11/16/2022]
Abstract
During the embryonic development of the nervous system there is a massive formation of synapses. However, the exuberant connectivity present after birth must be pruned during postnatal growth to optimize the function of neuronal circuits. Whilst glial cells play a fundamental role in the formation of early synaptic contacts, their contribution to developmental modifications of established synapses is not well understood. The present review aims to highlight the various roles of glia in the developmental refinement of embryonic synaptic connectivity. We summarize recent evidences linking secretory abilities of glial cells to the disassembly of synaptic contacts that are complementary of a well-established phagocytic role. Considering a theoretical framework, it is discussed how release of glial molecules could be relevant to the developmental refinement of synaptic connectivity. Finally, we propose a three-stage model of synapse elimination in which neurons and glia are functionally associated to timely eliminate synapses.
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Affiliation(s)
- Beatrice Terni
- Laboratory of Neurobiology, Department of Pathology and Experimental Therapeutics, Institute of Neurosciences, University of Barcelona and Bellvitge Biomedical Research Institute (IDIBELL), 08907 L'Hospitalet de Llobregat, Barcelona, Spain
| | - Francisco José López-Murcia
- Laboratory of Neurobiology, Department of Pathology and Experimental Therapeutics, Institute of Neurosciences, University of Barcelona and Bellvitge Biomedical Research Institute (IDIBELL), 08907 L'Hospitalet de Llobregat, Barcelona, Spain
| | - Artur Llobet
- Laboratory of Neurobiology, Department of Pathology and Experimental Therapeutics, Institute of Neurosciences, University of Barcelona and Bellvitge Biomedical Research Institute (IDIBELL), 08907 L'Hospitalet de Llobregat, Barcelona, Spain.
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Terni B, Ferrer I. Abnormal Expression and Distribution of MMP2 at Initial Stages of Alzheimer’s Disease-Related Pathology. J Alzheimers Dis 2015; 46:461-9. [DOI: 10.3233/jad-142460] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
Affiliation(s)
- Beatrice Terni
- Institute of Neuropathology, Bellvitge University Hospital, Hospitalet de Llobregat, Spain
- Laboratory of Neurobiology, Bellvitge Biomedical Research Institute (IDIBELL), Hospitalet de Llobregat, Spain
| | - Isidro Ferrer
- Institute of Neuropathology, Bellvitge University Hospital, Hospitalet de Llobregat, Spain
- University of Barcelona, Hospitalet de Llobregat, Spain
- CIBERNED, Institute Carlos III, Ministry of Health, Spain
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Bruni AC, Bernardi L, Colao R, Rubino E, Smirne N, Frangipane F, Terni B, Curcio SAM, Mirabelli M, Clodomiro A, Di Lorenzo R, Maletta R, Anfossi M, Gallo M, Geracitano S, Tomaino C, Muraca MG, Leotta A, Lio SG, Pinessi L, Rainero I, Sorbi S, Nee L, Milan G, Pappatà S, Postiglione A, Abbamondi N, Forloni G, St George Hyslop P, Rogaeva E, Bugiani O, Giaccone G, Foncin JF, Spillantini MG, Puccio G. Worldwide distribution of PSEN1 Met146Leu mutation: a large variability for a founder mutation. Neurology 2010; 74:798-806. [PMID: 20164095 DOI: 10.1212/wnl.0b013e3181d52785] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
Abstract
OBJECTIVE Large kindreds segregating familial Alzheimer disease (FAD) offer the opportunity of studying clinical variability as observed for presenilin 1 (PSEN1) mutations. Two early-onset FAD (EOFAD) Calabrian families with PSEN1 Met146Leu (ATG/CTG) mutation constitute a unique population descending from a remote common ancestor. Recently, several other EOFAD families with the same mutation have been described worldwide. METHODS We searched for a common founder of the PSEN1 Met146Leu mutation in families with different geographic origins by genealogic and molecular analyses. We also investigated the phenotypic variability at onset in a group of 50 patients (mean age at onset 40.0 +/- 4.8 years) by clinical, neuropsychological, and molecular methodologies. RESULTS EOFAD Met146Leu families from around the world resulted to be related and constitute a single kindred originating from Southern Italy before the 17th century. Phenotypic variability at onset is broad: 4 different clinical presentations may be recognized, 2 classic for AD (memory deficits and spatial and temporal disorientation), whereas the others are expressions of frontal impairment. The apathetic and dysexecutive subgroups could be related to orbital-medial prefrontal cortex and dorsolateral prefrontal cortex dysfunction. CONCLUSIONS Genealogic and molecular findings provided evidence that the PSEN1 Met146Leu families from around the world analyzed in this study are related and represent a single kindred originating from Southern Italy. The marked phenotypic variability might reflect early involvement by the pathologic process of different cortical areas. Although the clinical phenotype is quite variable, the neuropathologic and biochemical characteristics of the lesions account for neurodegenerative processes unmistakably of Alzheimer nature.
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Affiliation(s)
- A C Bruni
- Centro Regionale di Neurogenetica, Azienda Sanitaria Provinciale Catanzaro, Viale A. Perugini, 88046 Lamezia Terme (CZ), Italy.
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Terni B, Boada J, Portero-Otin M, Pamplona R, Ferrer I. Mitochondrial ATP-synthase in the entorhinal cortex is a target of oxidative stress at stages I/II of Alzheimer's disease pathology. Brain Pathol 2009; 20:222-33. [PMID: 19298596 DOI: 10.1111/j.1750-3639.2009.00266.x] [Citation(s) in RCA: 109] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2023] Open
Abstract
Oxidative stress has been implicated in the pathogenesis of several neurodegenerative diseases including Alzheimer's disease (AD). Several proteins have been identified as targets of oxidative damage in AD dementia (usually stages V/VI of Braak) and in subjects with mild cognitive impairment associated with middle stages of AD pathology (stage IV of Braak). In this study, we investigate whether brain proteins are locally modified by oxidative stress at the first stages of AD-related pathology when morphological lesions are restricted to the entorhinal and transentorhinal cortices of neurofibrillary pathology (stages I/II of Braak). Using a proteomic approach, we show that the alpha subunit of the mitochondrial adenosine triphosphate (ATP)-synthase is distinctly lipoxidized in the entorhinal cortex at Braak stages I/II compared with age-matched controls. In addition, ATP-synthase activity is significantly lower in Braak stages I/II than age-matched control, while electron transport chain, expressed by the mitochondrial complex I activity, remains not affected. This is the first study showing oxidative damage in the first stage, and clinically silent period, of AD-related pathology characterized by entorhinal and transentorhinal tauopathy.
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Affiliation(s)
- Beatrice Terni
- Institut de Neuropatologia, Servei Anatomia Patològica, IDIBELL, Hospital Universitari de Bellvitge, Universitat de Barcelona, CIBERNED, Hospitalet de Llobregat, Barcelona, Spain
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Abstract
Tau is a microtubule-associated protein involved in microtubule assembly and stabilization. Filamentous deposits made of tau constitute a major defining characteristic of several neurodegenerative diseases known as tauopathies including Alzheimer's disease. The involvement of tau in neurodegeneration has been clarified by the identification of genetic mutations in the tau gene in cases with familial frontotemporal dementia and parkinsonism linked to chromosome 17 (FTDP-17). Although the mechanism through which tau mutations lead to neuronal death is still unresolved, it is clear that tau mutations lead to formation of tau filaments that have a different morphology, contain different types of tau isoforms and produce distinct tau deposits. The range of tau pathology identified in FTDP-17 recapitulates the tau pathology present in sporadic tauopathies and indicates that tau dysfunction plays a major role also in these diseases.
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Affiliation(s)
- Laura Gasparini
- Cambridge Centre for Brain Repair, Department of Clinical Neurosciences, University of Cambridge, Cambridge, UK
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Terni B, Rey MJ, Boluda S, Torrejón-Escribano B, Sabate MP, Calopa M, van Leeuwen FW, Ferrer I. Mutant ubiquitin and p62 immunoreactivity in cases of combined multiple system atrophy and Alzheimer's disease. Acta Neuropathol 2007; 113:403-16. [PMID: 17237936 DOI: 10.1007/s00401-006-0192-3] [Citation(s) in RCA: 32] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/29/2006] [Revised: 12/23/2006] [Accepted: 12/24/2006] [Indexed: 01/08/2023]
Abstract
Recent studies have shown the co-existence of alpha-synuclein and phosphorylated tau (pTau) in several neurodegenerative diseases. Here, we report two autopsy cases of combined multiple system atrophy (MSA) and Alzheimer's disease (AD). In both cases, abundant alpha-synuclein-positive glial and neuronal cytoplasmic inclusions were found in the brainstem, amygdala and hippocampal formation. pTau-positive neurofibrillary tangles (NFTs) were widely distributed in case 1 (Braak stage VI) and moderate in case 2 (Braak stage III). Although alpha-synuclein and pTau pathology co-occurred in the hippocampus and entorhinal cortex, only a few neurons showed co-existence of these two proteins. Immunoreactivity for p62, a ubiquitin proteasome system related protein, was found in the majority of NFTs, but in only a small proportion of neuronal alpha-synuclein inclusions. In addition, UBB+1, a mutant form of ubiquitin and a marker for proteasomal dysfunction, was present in the majority of NFTs, whereas co-existence of alpha-synuclein and UBB+1 was found in only a few neurons. These findings indicate that alpha-synuclein and phosphorylated tau co-occur in certain brain regions in cases of combined MSA and AD and that the proteasomal pathways differ between alpha-synuclein- and pTau-bearing neurons.
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Affiliation(s)
- Beatrice Terni
- Institut de Neuropatologia, Servei Anatomia Patològica, Facultad de Medicina, IDIBELL-Hospital Universitari de Bellvitge, Universitat de Barcelona, Hospitalet de Llobregat, Carrer Feixa Llarga sn, 08907 Hospitalet de Llobregat, Barcelona, Spain
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Bertini I, Calderone V, Cosenza M, Fragai M, Lee YM, Luchinat C, Mangani S, Terni B, Turano P. Conformational variability of matrix metalloproteinases: beyond a single 3D structure. Proc Natl Acad Sci U S A 2005; 102:5334-9. [PMID: 15809432 PMCID: PMC556229 DOI: 10.1073/pnas.0407106102] [Citation(s) in RCA: 113] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
The structures of the catalytic domain of matrix metalloproteinase 12 in the presence of acetohydroxamic acid and N-isobutyl-N-[4-methoxyphenylsulfonyl]glycyl hydroxamic acid have been solved by x-ray diffraction in the crystalline state at 1.0 and 1.3-A resolution, respectively, and compared with the previously published x-ray structure at 1.2-A resolution of the adduct with batimastat. The structure of the N-isobutyl-N-[4-methoxyphenylsulfonyl]glycyl hydroxamic acid adduct has been solved by NMR in solution. The three x-ray structures and the solution structure are similar but not identical to one another, the differences being sizably higher in the loops. We propose that many of the loops show a dynamical behavior in solution on a variety of time scales. Different conformations of some flexible regions of the protein can be observed as "frozen" in different crystalline environments. The mobility in solution studied by NMR reveals conformational equilibria in accessible time scales, i.e., from 10(-5) s to ms and more. Averaging of some residual dipolar couplings is consistent with further motions down to 10(-9) s. Finally, local thermal motions of each frozen conformation in the crystalline state at 100 K correlate well with local motions on the picosecond time scale. Flexibility/conformational heterogeneity in crucial parts of the catalytic domain is a rule rather than an exception in matrix metalloproteinases, and its extent may be underestimated by inspection of one x-ray structure. Backbone flexibility may play a role in the difficulties encountered in the design of selective inhibitors, whereas it may be a requisite for substrate binding and broad substrate specificity.
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Affiliation(s)
- Ivano Bertini
- Magnetic Resonance Center (Centro di Risonanze Magnetiche), University of Florence, Via Luigi Sacconi 6, 50019 Sesto Fiorentino, Italy.
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Bertini I, Calderone V, Fragai M, Luchinat C, Mangani S, Terni B. Crystal structure of the catalytic domain of human matrix metalloproteinase 10. J Mol Biol 2004; 336:707-16. [PMID: 15095982 DOI: 10.1016/j.jmb.2003.12.033] [Citation(s) in RCA: 38] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/25/2003] [Revised: 11/28/2003] [Accepted: 12/11/2003] [Indexed: 11/29/2022]
Abstract
The catalytic domain of matrix metalloproteinase-10 (MMP-10) has been expressed in Escherichia coli and its crystal structure solved at 2.1 A resolution. The availability of this structure allowed us to critically examine the small differences existing between the catalytic domains of MMP-3 and MMP-10, which show the highest sequence identity among all MMPs. Furthermore, the binding mode of N-isobutyl-N-[4-methoxyphenylsulfonyl]glycyl hydroxamic acid (NNGH), which is one of the most known commercial inhibitors of MMPs, is described for the first time.
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Affiliation(s)
- I Bertini
- CERM, University of Florence and FiorGen Foundation, Via Sacconi 6, 50019 Sesto Fiorentino, Florence, Italy.
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Bertini I, Fragai M, Lee YM, Luchinat C, Terni B. Paramagnetic Metal Ions in Ligand Screening: The CoII Matrix Metalloproteinase 12. Angew Chem Int Ed Engl 2004. [DOI: 10.1002/ange.200353453] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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Bertini I, Fragai M, Lee YM, Luchinat C, Terni B. Paramagnetic Metal Ions in Ligand Screening: The CoII Matrix Metalloproteinase 12. Angew Chem Int Ed Engl 2004; 43:2254-6. [PMID: 15108136 DOI: 10.1002/anie.200353453] [Citation(s) in RCA: 49] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Affiliation(s)
- Ivano Bertini
- Magnetic Resonance Center, University of Florence, Via L. Sacconi 6, 50019 Sesto Fiorentino, Italy.
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Bertini I, Calderone V, Fragai M, Luchinat C, Mangani S, Terni B. X-ray structures of binary and ternary enzyme-product-inhibitor complexes of matrix metalloproteinases. Angew Chem Int Ed Engl 2003; 42:2673-6. [PMID: 12813751 DOI: 10.1002/anie.200350957] [Citation(s) in RCA: 34] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Ivano Bertini
- Magnetic Resonance Center and Department of Chemistry, University of Florence, via Luigi Sacconi, 6, 50019 Sesto Fiorentino, Italy.
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