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Medina-Luque J, Piechocinski P, Feyen P, Sgobio C, Herms J. Striatal dopamine neurotransmission is altered in age- and region-specific manner in a Parkinson's disease transgenic mouse. Sci Rep 2024; 14:164. [PMID: 38167878 PMCID: PMC10761704 DOI: 10.1038/s41598-023-49600-5] [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] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/01/2023] [Accepted: 12/10/2023] [Indexed: 01/05/2024] Open
Abstract
Dopamine (DA) plays a critical role in striatal motor control. The drop in DA level within the dorsal striatum is directly associated with the appearance of motor symptoms in Parkinson's disease (PD). The progression of the disease and inherent disruption of the DA neurotransmission has been closely related to accumulation of the synaptic protein α-synuclein. However, it is still unclear how α-synuclein affects dopaminergic terminals in different areas of dorsal striatum. Here we demonstrate that the overexpression of human α-synuclein (h-α-syn) interferes with the striatal DA neurotransmission in an age-dependent manner, preferentially in the dorsolateral striatum (DLS) of PDGF-h-α-syn mice. While 3-month-old mice showed an increase at the onset of h-α-syn accumulation in the DLS, 12-month-old mice revealed a decrease in electrically-evoked DA release. The enhanced DA release in 3-month-old mice coincided with better performance in a behavioural task. Notably, DA amplitude alterations were also accompanied by a delay in the DA clearance independently from the animal age. Structurally, dopamine transporter (DAT) was found to be redistributed in larger DAT-positive clumps only in the DLS of 3- and 12-month-old mice. Together, our data provide new insight into the vulnerability of DLS and suggest DAT-related dysfunctionalities from the very early stages of h-α-syn accumulation.
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Affiliation(s)
- Jose Medina-Luque
- German Centre for Neurodegenerative Diseases (DZNE), Munich, Germany
| | | | - Paul Feyen
- German Centre for Neurodegenerative Diseases (DZNE), Munich, Germany
| | - Carmelo Sgobio
- German Centre for Neurodegenerative Diseases (DZNE), Munich, Germany.
- Centre for Neuropathology and Prion Research, Ludwig-Maximilians University, Munich, Germany.
| | - Jochen Herms
- German Centre for Neurodegenerative Diseases (DZNE), Munich, Germany.
- Centre for Neuropathology and Prion Research, Ludwig-Maximilians University, Munich, Germany.
- Munich Cluster of Systems Neurology (SyNergy), Munich, Germany.
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2
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Kunze LH, Ruch F, Biechele G, Eckenweber F, Wind-Mark K, Dinkel L, Feyen P, Bartenstein P, Ziegler S, Paeger L, Tahirovic S, Herms J, Brendel M. Long-Term Pioglitazone Treatment Has No Significant Impact on Microglial Activation and Tau Pathology in P301S Mice. Int J Mol Sci 2023; 24:10106. [PMID: 37373253 DOI: 10.3390/ijms241210106] [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] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/19/2023] [Revised: 06/12/2023] [Accepted: 06/13/2023] [Indexed: 06/29/2023] Open
Abstract
Neuroinflammation is one disease hallmark on the road to neurodegeneration in primary tauopathies. Thus, immunomodulation might be a suitable treatment strategy to delay or even prevent the occurrence of symptoms and thus relieve the burden for patients and caregivers. In recent years, the peroxisome proliferator-activated receptor γ (PPARγ) has received increasing attention as it is immediately involved in the regulation of the immune system and can be targeted by the anti-diabetic drug pioglitazone. Previous studies have shown significant immunomodulation in amyloid-β (Aβ) mouse models by pioglitazone. In this study, we performed long-term treatment over six months in P301S mice as a tauopathy model with either pioglitazone or placebo. We performed serial 18 kDa translocator protein positron-emission-tomography (TSPO-PET) imaging and terminal immunohistochemistry to assess microglial activation during treatment. Tau pathology was quantified via immunohistochemistry at the end of the study. Long-term pioglitazone treatment had no significant effect on TSPO-PET, immunohistochemistry read-outs of microglial activation, or tau pathology levels in P301S mice. Thus, we conclude that pioglitazone modifies the time course of Aβ-dependent microglial activation, but does not significantly modulate microglial activation in response to tau pathology.
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Affiliation(s)
- Lea Helena Kunze
- Department of Nuclear Medicine, University Hospital of LMU Munich, Marchioninistraße 15, 81377 Munich, Germany
- German Center for Neurodegenerative Diseases (DZNE) Munich, Feodor-Lynen-Str. 17, 81377 Munich, Germany
| | - François Ruch
- Department of Nuclear Medicine, University Hospital of LMU Munich, Marchioninistraße 15, 81377 Munich, Germany
| | - Gloria Biechele
- Department of Radiology, University Hospital of LMU Munich, Marchioninistraße 15, 81377 Munich, Germany
| | - Florian Eckenweber
- Department of Nuclear Medicine, University Hospital of LMU Munich, Marchioninistraße 15, 81377 Munich, Germany
| | - Karin Wind-Mark
- Department of Nuclear Medicine, University Hospital of LMU Munich, Marchioninistraße 15, 81377 Munich, Germany
- German Center for Neurodegenerative Diseases (DZNE) Munich, Feodor-Lynen-Str. 17, 81377 Munich, Germany
| | - Lina Dinkel
- German Center for Neurodegenerative Diseases (DZNE) Munich, Feodor-Lynen-Str. 17, 81377 Munich, Germany
| | - Paul Feyen
- German Center for Neurodegenerative Diseases (DZNE) Munich, Feodor-Lynen-Str. 17, 81377 Munich, Germany
| | - Peter Bartenstein
- Department of Nuclear Medicine, University Hospital of LMU Munich, Marchioninistraße 15, 81377 Munich, Germany
- Munich Cluster for Systems Neurology (SyNergy), Ludwig Maximilian University of Munich, 81377 Munich, Germany
| | - Sibylle Ziegler
- Department of Nuclear Medicine, University Hospital of LMU Munich, Marchioninistraße 15, 81377 Munich, Germany
| | - Lars Paeger
- German Center for Neurodegenerative Diseases (DZNE) Munich, Feodor-Lynen-Str. 17, 81377 Munich, Germany
| | - Sabina Tahirovic
- German Center for Neurodegenerative Diseases (DZNE) Munich, Feodor-Lynen-Str. 17, 81377 Munich, Germany
| | - Jochen Herms
- German Center for Neurodegenerative Diseases (DZNE) Munich, Feodor-Lynen-Str. 17, 81377 Munich, Germany
- Munich Cluster for Systems Neurology (SyNergy), Ludwig Maximilian University of Munich, 81377 Munich, Germany
- Center for Neuropathology and Prion Research, LMU Munich, Feodor-Lynen-Str. 23, 81377 Munich, Germany
| | - Matthias Brendel
- Department of Nuclear Medicine, University Hospital of LMU Munich, Marchioninistraße 15, 81377 Munich, Germany
- German Center for Neurodegenerative Diseases (DZNE) Munich, Feodor-Lynen-Str. 17, 81377 Munich, Germany
- Munich Cluster for Systems Neurology (SyNergy), Ludwig Maximilian University of Munich, 81377 Munich, Germany
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Maya-Vetencourt JF, Ghezzi D, Antognazza MR, Colombo E, Mete M, Feyen P, Desii A, Buschiazzo A, Di Paolo M, Di Marco S, Ticconi F, Emionite L, Shmal D, Marini C, Donelli I, Freddi G, Maccarone R, Bisti S, Sambuceti G, Pertile G, Lanzani G, Benfenati F. A fully organic retinal prosthesis restores vision in a rat model of degenerative blindness. Nat Mater 2017; 16:681-689. [PMID: 28250420 PMCID: PMC5446789 DOI: 10.1038/nmat4874] [Citation(s) in RCA: 156] [Impact Index Per Article: 22.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/01/2016] [Accepted: 01/31/2017] [Indexed: 05/17/2023]
Abstract
The degeneration of photoreceptors in the retina is one of the major causes of adult blindness in humans. Unfortunately, no effective clinical treatments exist for the majority of retinal degenerative disorders. Here we report on the fabrication and functional validation of a fully organic prosthesis for long-term in vivo subretinal implantation in the eye of Royal College of Surgeons rats, a widely recognized model of retinitis pigmentosa. Electrophysiological and behavioural analyses reveal a prosthesis-dependent recovery of light sensitivity and visual acuity that persists up to 6-10 months after surgery. The rescue of the visual function is accompanied by an increase in the basal metabolic activity of the primary visual cortex, as demonstrated by positron emission tomography imaging. Our results highlight the possibility of developing a new generation of fully organic, highly biocompatible and functionally autonomous photovoltaic prostheses for subretinal implants to treat degenerative blindness.
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Affiliation(s)
| | - Diego Ghezzi
- Center for Synaptic Neuroscience and Technology, Istituto Italiano di Tecnologia, Genoa, Italy
| | - Maria Rosa Antognazza
- Center for Nano Science and Technology, Istituto Italiano di Tecnologia, Milan, Italy
| | - Elisabetta Colombo
- Center for Synaptic Neuroscience and Technology, Istituto Italiano di Tecnologia, Genoa, Italy
| | - Maurizio Mete
- Ophthalmology Department, Sacro Cuore Hospital - Don Calabria, Negrar, Italy
| | - Paul Feyen
- Center for Synaptic Neuroscience and Technology, Istituto Italiano di Tecnologia, Genoa, Italy
| | - Andrea Desii
- Center for Nano Science and Technology, Istituto Italiano di Tecnologia, Milan, Italy
| | - Ambra Buschiazzo
- Department of Health Science, Nuclear Medicine, University of Genoa, Genoa, Italy
| | - Mattia Di Paolo
- Department of Biotechnology and Applied Clinical Science, University of L’Aquila, Italy
| | - Stefano Di Marco
- Department of Biotechnology and Applied Clinical Science, University of L’Aquila, Italy
| | - Flavia Ticconi
- Department of Health Science, Nuclear Medicine, University of Genoa, Genoa, Italy
| | - Laura Emionite
- Animal Facility, National Institute Cancer Research, IRCCS AOU San Martino-IST, Genoa, Italy
| | - Dmytro Shmal
- Center for Synaptic Neuroscience and Technology, Istituto Italiano di Tecnologia, Genoa, Italy
| | - Cecilia Marini
- Institute of Molecular Bio-imaging and Physiology (IBFM), CNR, Milan (GE section), Italy
| | | | | | - Rita Maccarone
- Department of Biotechnology and Applied Clinical Science, University of L’Aquila, Italy
| | - Silvia Bisti
- Department of Biotechnology and Applied Clinical Science, University of L’Aquila, Italy
| | - Gianmario Sambuceti
- Department of Health Science, Nuclear Medicine, University of Genoa, Genoa, Italy
| | - Grazia Pertile
- Ophthalmology Department, Sacro Cuore Hospital - Don Calabria, Negrar, Italy
| | - Guglielmo Lanzani
- Center for Nano Science and Technology, Istituto Italiano di Tecnologia, Milan, Italy
| | - Fabio Benfenati
- Center for Synaptic Neuroscience and Technology, Istituto Italiano di Tecnologia, Genoa, Italy
- Department of Experimental Medicine, University of Genoa, Genoa, Italy
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Colombo E, Feyen P, Antognazza MR, Lanzani G, Benfenati F. Nanoparticles: A Challenging Vehicle for Neural Stimulation. Front Neurosci 2016; 10:105. [PMID: 27047327 PMCID: PMC4803724 DOI: 10.3389/fnins.2016.00105] [Citation(s) in RCA: 35] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/30/2015] [Accepted: 03/04/2016] [Indexed: 12/12/2022] Open
Abstract
Neurostimulation represents a powerful and well-established tool for the treatment of several diseases affecting the central nervous system. Although, effective in reducing the symptoms or the progression of brain disorders, the poor accessibility of the deepest areas of the brain currently hampers the possibility of a more specific and controlled therapeutic stimulation, depending on invasive surgical approaches and long-term stability, and biocompatibility issues. The massive research of the last decades on nanomaterials and nanoscale devices favored the development of new tools to address the limitations of the available neurostimulation approaches. This mini-review focuses on the employment of nanoparticles for the modulation of the electrophysiological activity of neuronal networks and the related transduction mechanisms underlying the nanostructure-neuron interfaces.
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Affiliation(s)
- Elisabetta Colombo
- Center for Synaptic Neuroscience and Technology, Istituto Italiano di Tecnologia Genova, Italy
| | - Paul Feyen
- Center for Synaptic Neuroscience and Technology, Istituto Italiano di Tecnologia Genova, Italy
| | - Maria Rosa Antognazza
- Center for Nano Science and Technology, Istituto Italiano di Tecnologia Milan, Italy
| | - Guglielmo Lanzani
- Center for Nano Science and Technology, Istituto Italiano di TecnologiaMilan, Italy; Department of Physics, Politecnico di MilanoMilan, Italy
| | - Fabio Benfenati
- Center for Synaptic Neuroscience and Technology, Istituto Italiano di TecnologiaGenova, Italy; Department of Experimental Medicine, Università di GenovaGenova, Italy
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5
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Feyen P, Colombo E, Endeman D, Nova M, Laudato L, Martino N, Antognazza MR, Lanzani G, Benfenati F, Ghezzi D. Light-evoked hyperpolarization and silencing of neurons by conjugated polymers. Sci Rep 2016; 6:22718. [PMID: 26940513 PMCID: PMC4778138 DOI: 10.1038/srep22718] [Citation(s) in RCA: 59] [Impact Index Per Article: 7.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/19/2015] [Accepted: 02/18/2016] [Indexed: 11/29/2022] Open
Abstract
The ability to control and modulate the action potential firing in neurons represents a powerful tool for neuroscience research and clinical applications. While neuronal excitation has been achieved with many tools, including electrical and optical stimulation, hyperpolarization and neuronal inhibition are typically obtained through patch-clamp or optogenetic manipulations. Here we report the use of conjugated polymer films interfaced with neurons for inducing a light-mediated inhibition of their electrical activity. We show that prolonged illumination of the interface triggers a sustained hyperpolarization of the neuronal membrane that significantly reduces both spontaneous and evoked action potential firing. We demonstrate that the polymeric interface can be activated by either visible or infrared light and is capable of modulating neuronal activity in brain slices and explanted retinas. These findings prove the ability of conjugated polymers to tune neuronal firing and suggest their potential application for the in-vivo modulation of neuronal activity.
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Affiliation(s)
- Paul Feyen
- Center for Synaptic Neuroscience and Technology, Istituto Italiano di Tecnologia, Largo Rosanna Benzi 10, 16132 Genova, Italy
| | - Elisabetta Colombo
- Center for Synaptic Neuroscience and Technology, Istituto Italiano di Tecnologia, Largo Rosanna Benzi 10, 16132 Genova, Italy
- Center for Nano Science and Technology, Istituto Italiano di Tecnologia, Via Pascoli 70/3, 20133 Milano, Italy
| | - Duco Endeman
- Center for Synaptic Neuroscience and Technology, Istituto Italiano di Tecnologia, Largo Rosanna Benzi 10, 16132 Genova, Italy
| | - Mattia Nova
- Center for Synaptic Neuroscience and Technology, Istituto Italiano di Tecnologia, Largo Rosanna Benzi 10, 16132 Genova, Italy
| | - Lucia Laudato
- Center for Nano Science and Technology, Istituto Italiano di Tecnologia, Via Pascoli 70/3, 20133 Milano, Italy
| | - Nicola Martino
- Center for Nano Science and Technology, Istituto Italiano di Tecnologia, Via Pascoli 70/3, 20133 Milano, Italy
- Dipartimento di Fisica, Politecnico di Milano, Piazza Leonardo Da Vinci 32, 20133 Milano, Italy
| | - Maria Rosa Antognazza
- Center for Nano Science and Technology, Istituto Italiano di Tecnologia, Via Pascoli 70/3, 20133 Milano, Italy
| | - Guglielmo Lanzani
- Center for Nano Science and Technology, Istituto Italiano di Tecnologia, Via Pascoli 70/3, 20133 Milano, Italy
- Dipartimento di Fisica, Politecnico di Milano, Piazza Leonardo Da Vinci 32, 20133 Milano, Italy
| | - Fabio Benfenati
- Center for Synaptic Neuroscience and Technology, Istituto Italiano di Tecnologia, Largo Rosanna Benzi 10, 16132 Genova, Italy
- Department of Experimental Medicine, University of Genova, Viale Benedetto XV 3, 16132 Genova, Italy
| | - Diego Ghezzi
- Center for Synaptic Neuroscience and Technology, Istituto Italiano di Tecnologia, Largo Rosanna Benzi 10, 16132 Genova, Italy
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6
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Antognazza MR, Martino N, Ghezzi D, Feyen P, Colombo E, Endeman D, Benfenati F, Lanzani G. Shedding Light on Living Cells. Adv Mater 2015; 27:7662-7669. [PMID: 25469452 DOI: 10.1002/adma.201403513] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/01/2014] [Revised: 10/01/2014] [Indexed: 06/04/2023]
Abstract
An overview of the optical methods available to modulate the cellular activity in cell cultures and biological tissues is presented, with a focus on the use of exogenous functional materials that absorb electromagnetic radiation and transduce it into a secondary stimulus for cell excitation, with high temporal and spatial resolution. Both organic and inorganic materials are critically evaluated, for in vitro and in vivo applications. Finally, as a direct practical application of optical-stimulation techniques, the most recent results in the realization of artificial visual implants are discussed.
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Affiliation(s)
- Maria Rosa Antognazza
- Center for Nano Science and Technology, @PoliMi, Istituto Italiano di Tecnologia, Via Pascoli 70/3, Milano, 20133, Italy
| | - Nicola Martino
- Center for Nano Science and Technology, @PoliMi, Istituto Italiano di Tecnologia, Via Pascoli 70/3, Milano, 20133, Italy
- Politecnico di Milano, Dipartimento di Fisica, Piazza L. da Vinci 32, Milano, 20133, Italy
| | - Diego Ghezzi
- Istituto Italiano di Tecnologia, Neuroscience and Brain Technologies Department, Via Morego 30, Genova, 16163, Italy
| | - Paul Feyen
- Istituto Italiano di Tecnologia, Neuroscience and Brain Technologies Department, Via Morego 30, Genova, 16163, Italy
| | - Elisabetta Colombo
- Center for Nano Science and Technology, @PoliMi, Istituto Italiano di Tecnologia, Via Pascoli 70/3, Milano, 20133, Italy
- Istituto Italiano di Tecnologia, Neuroscience and Brain Technologies Department, Via Morego 30, Genova, 16163, Italy
| | - Duco Endeman
- Istituto Italiano di Tecnologia, Neuroscience and Brain Technologies Department, Via Morego 30, Genova, 16163, Italy
| | - Fabio Benfenati
- Istituto Italiano di Tecnologia, Neuroscience and Brain Technologies Department, Via Morego 30, Genova, 16163, Italy
| | - Guglielmo Lanzani
- Center for Nano Science and Technology, @PoliMi, Istituto Italiano di Tecnologia, Via Pascoli 70/3, Milano, 20133, Italy
- Politecnico di Milano, Dipartimento di Fisica, Piazza L. da Vinci 32, Milano, 20133, Italy
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Martino N, Feyen P, Porro M, Bossio C, Zucchetti E, Ghezzi D, Benfenati F, Lanzani G, Antognazza MR. Photothermal cellular stimulation in functional bio-polymer interfaces. Sci Rep 2015; 5:8911. [PMID: 25753132 PMCID: PMC4354102 DOI: 10.1038/srep08911] [Citation(s) in RCA: 90] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/18/2014] [Accepted: 02/02/2015] [Indexed: 12/29/2022] Open
Abstract
Hybrid interfaces between organic semiconductors and living tissues represent a new tool for in-vitro and in-vivo applications, bearing a huge potential, from basic researches to clinical applications. In particular, light sensitive conjugated polymers can be exploited as a new approach for optical modulation of cellular activity. In this work we focus on light-induced changes in the membrane potential of Human Embryonic Kidney (HEK-293) cells grown on top of a poly(3-hexylthiophene) (P3HT) thin film. On top of a capacitive charging of the polymer interface, we identify and fully characterize two concomitant mechanisms, leading to membrane depolarization and hyperpolarisation, both mediated by a thermal effect. Our results can be usefully exploited in the creation of a new platform for light-controlled cell manipulation, with possible applications in neuroscience and medicine.
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Affiliation(s)
- Nicola Martino
- Center for Nano Science and Technology, Istituto Italiano di Tecnologia, Via Pascoli 70/3, 20133 Milano, Italy
- Politecnico di Milano, Dip.to di Fisica, P.zza L. Da Vinci 32, 20133 Milano, Italy
| | - Paul Feyen
- Center for Synaptic Neuroscience, Department of Neuroscience and Brain Technologies, Istituto Italiano di Tecnologia, Via Morego 30, 16163 Genova, Italy
- Department of Experimental Medicine, University of Genova, Viale Benedetto XV 3, 16132 Genova, Italy
| | - Matteo Porro
- Center for Nano Science and Technology, Istituto Italiano di Tecnologia, Via Pascoli 70/3, 20133 Milano, Italy
- Politecnico di Milano, Dip.to di Matematica, P.zza L. Da Vinci 32, 20133 Milano, Italy
| | - Caterina Bossio
- Center for Nano Science and Technology, Istituto Italiano di Tecnologia, Via Pascoli 70/3, 20133 Milano, Italy
- Politecnico di Milano, Dip.to di Fisica, P.zza L. Da Vinci 32, 20133 Milano, Italy
| | - Elena Zucchetti
- Center for Nano Science and Technology, Istituto Italiano di Tecnologia, Via Pascoli 70/3, 20133 Milano, Italy
- Politecnico di Milano, Dip.to di Fisica, P.zza L. Da Vinci 32, 20133 Milano, Italy
| | - Diego Ghezzi
- Center for Synaptic Neuroscience, Department of Neuroscience and Brain Technologies, Istituto Italiano di Tecnologia, Via Morego 30, 16163 Genova, Italy
| | - Fabio Benfenati
- Center for Synaptic Neuroscience, Department of Neuroscience and Brain Technologies, Istituto Italiano di Tecnologia, Via Morego 30, 16163 Genova, Italy
- Department of Experimental Medicine, University of Genova, Viale Benedetto XV 3, 16132 Genova, Italy
| | - Guglielmo Lanzani
- Center for Nano Science and Technology, Istituto Italiano di Tecnologia, Via Pascoli 70/3, 20133 Milano, Italy
- Politecnico di Milano, Dip.to di Fisica, P.zza L. Da Vinci 32, 20133 Milano, Italy
| | - Maria Rosa Antognazza
- Center for Nano Science and Technology, Istituto Italiano di Tecnologia, Via Pascoli 70/3, 20133 Milano, Italy
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Noam Y, Ehrengruber MU, Koh A, Feyen P, Manders EMM, Abbott GW, Wadman WJ, Baram TZ. Filamin A promotes dynamin-dependent internalization of hyperpolarization-activated cyclic nucleotide-gated type 1 (HCN1) channels and restricts Ih in hippocampal neurons. J Biol Chem 2014; 289:5889-903. [PMID: 24403084 PMCID: PMC3937658 DOI: 10.1074/jbc.m113.522060] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/24/2013] [Revised: 12/27/2013] [Indexed: 11/06/2022] Open
Abstract
The actin-binding protein filamin A (FLNa) regulates neuronal migration during development, yet its roles in the mature brain remain largely obscure. Here, we probed the effects of FLNa on the regulation of ion channels that influence neuronal properties. We focused on the HCN1 channels that conduct Ih, a hyperpolarization-activated current crucial for shaping intrinsic neuronal properties. Whereas regulation of HCN1 channels by FLNa has been observed in melanoma cell lines, its physiological relevance to neuronal function and the underlying cellular pathways that govern this regulation remain unknown. Using a combination of mutational, pharmacological, and imaging approaches, we find here that FLNa facilitates a selective and reversible dynamin-dependent internalization of HCN1 channels in HEK293 cells. This internalization is accompanied by a redistribution of HCN1 channels on the cell surface, by accumulation of the channels in endosomal compartments, and by reduced Ih density. In hippocampal neurons, expression of a truncated dominant-negative FLNa enhances the expression of native HCN1. Furthermore, acute abrogation of HCN1-FLNa interaction in neurons, with the use of decoy peptides that mimic the FLNa-binding domain of HCN1, abolishes the punctate distribution of HCN1 channels in neuronal cell bodies, augments endogenous Ih, and enhances the rebound-response ("voltage-sag") of the neuronal membrane to transient hyperpolarizing events. Together, these results support a major function of FLNa in modulating ion channel abundance and membrane trafficking in neurons, thereby shaping their biophysical properties and function.
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Affiliation(s)
- Yoav Noam
- From the Departments of Anatomy/Neurobiology and Pediatrics and
| | | | - Annie Koh
- From the Departments of Anatomy/Neurobiology and Pediatrics and
| | | | - Erik M. M. Manders
- van Leeuwenhoek Centre for Advanced Microscopy, University of Amsterdam, 1098XH Amsterdam, The Netherlands
| | - Geoffrey W. Abbott
- Pharmacology, University of California at Irvine, Irvine, California 92697-4475 and
| | | | - Tallie Z. Baram
- From the Departments of Anatomy/Neurobiology and Pediatrics and
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