Transmissible α-synuclein seeding activity in brain and stomach of patients with Parkinson’s disease

Cerebral deposition of abnormally aggregated α-synuclein (αSyn) is a neuropathological hallmark of Parkinson’s disease (PD). PD-associated αSyn (αSyn PD ) aggregates can act as proteinaceous nuclei (“seeds”) able of self-templated propagation. Since this is strikingly reminiscent to properties of pr...

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Veröffentlicht in:Acta neuropathologica 2021-06, Vol.141 (6), p.861-879
Hauptverfasser: Thomzig, Achim, Wagenführ, Katja, Pinder, Phillip, Joncic, Marion, Schulz-Schaeffer, Walter J., Beekes, Michael
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container_title Acta neuropathologica
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creator Thomzig, Achim
Wagenführ, Katja
Pinder, Phillip
Joncic, Marion
Schulz-Schaeffer, Walter J.
Beekes, Michael
description Cerebral deposition of abnormally aggregated α-synuclein (αSyn) is a neuropathological hallmark of Parkinson’s disease (PD). PD-associated αSyn (αSyn PD ) aggregates can act as proteinaceous nuclei (“seeds”) able of self-templated propagation. Since this is strikingly reminiscent to properties of proteinaceous infectious particles (prions), lessons learned from prion diseases suggest to test whether transferred αSyn PD can propagate and induce neurological impairments or disease in a new host. Two studies that addressed this question provided divergent results. Intracerebral (i.c.) injection of Lewy body extracts from PD patients caused cerebral αSyn pathology, as well as nigrostriatal neurodegeneration, of wild-type mice and macaques, with the mice also showing motor impairments (Recasens et al. 2014, Ann Neurol 75:351–362). In contrast, i.c. transmission of homogenates from PD brains did not stimulate, after “> 360” days post-injection (dpi), pathological αSyn conversion or clinical symptoms in transgenic TgM83 +/− mice hemizygously expressing mutated (A53T) human αSyn (Prusiner et al. 2015, PNAS 112:E5308–E5317). To advance the assessment of possible αSyn PD hazards by providing further data, we examined neuropathological and clinical effects upon i.c. transmission of brain, stomach wall and muscle tissue as well as blood from PD patients in TgM83 +/− mice up to 612 dpi. This revealed a subtle, yet distinctive stimulation of localized αSyn aggregation in the somatodendritic compartment and dystrophic neurites of individual or focally clustered cerebral neurons after challenge with brain and stomach wall homogenates. No such effect was observed with transmitted blood or homogenized muscle tissue. The detected stimulation of αSyn aggregation was not accompanied by apparent motor impairments or overt neurological disease in TgM83 +/− mice. Our study substantiated that transmitted αSyn PD seeds, including those from the stomach wall, are able to propagate in new mammalian hosts. The consequences of such propagation and potential safeguards need to be further investigated.
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PD-associated αSyn (αSyn PD ) aggregates can act as proteinaceous nuclei (“seeds”) able of self-templated propagation. Since this is strikingly reminiscent to properties of proteinaceous infectious particles (prions), lessons learned from prion diseases suggest to test whether transferred αSyn PD can propagate and induce neurological impairments or disease in a new host. Two studies that addressed this question provided divergent results. Intracerebral (i.c.) injection of Lewy body extracts from PD patients caused cerebral αSyn pathology, as well as nigrostriatal neurodegeneration, of wild-type mice and macaques, with the mice also showing motor impairments (Recasens et al. 2014, Ann Neurol 75:351–362). In contrast, i.c. transmission of homogenates from PD brains did not stimulate, after “&gt; 360” days post-injection (dpi), pathological αSyn conversion or clinical symptoms in transgenic TgM83 +/− mice hemizygously expressing mutated (A53T) human αSyn (Prusiner et al. 2015, PNAS 112:E5308–E5317). To advance the assessment of possible αSyn PD hazards by providing further data, we examined neuropathological and clinical effects upon i.c. transmission of brain, stomach wall and muscle tissue as well as blood from PD patients in TgM83 +/− mice up to 612 dpi. This revealed a subtle, yet distinctive stimulation of localized αSyn aggregation in the somatodendritic compartment and dystrophic neurites of individual or focally clustered cerebral neurons after challenge with brain and stomach wall homogenates. No such effect was observed with transmitted blood or homogenized muscle tissue. The detected stimulation of αSyn aggregation was not accompanied by apparent motor impairments or overt neurological disease in TgM83 +/− mice. Our study substantiated that transmitted αSyn PD seeds, including those from the stomach wall, are able to propagate in new mammalian hosts. 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PD-associated αSyn (αSyn PD ) aggregates can act as proteinaceous nuclei (“seeds”) able of self-templated propagation. Since this is strikingly reminiscent to properties of proteinaceous infectious particles (prions), lessons learned from prion diseases suggest to test whether transferred αSyn PD can propagate and induce neurological impairments or disease in a new host. Two studies that addressed this question provided divergent results. Intracerebral (i.c.) injection of Lewy body extracts from PD patients caused cerebral αSyn pathology, as well as nigrostriatal neurodegeneration, of wild-type mice and macaques, with the mice also showing motor impairments (Recasens et al. 2014, Ann Neurol 75:351–362). In contrast, i.c. transmission of homogenates from PD brains did not stimulate, after “&gt; 360” days post-injection (dpi), pathological αSyn conversion or clinical symptoms in transgenic TgM83 +/− mice hemizygously expressing mutated (A53T) human αSyn (Prusiner et al. 2015, PNAS 112:E5308–E5317). To advance the assessment of possible αSyn PD hazards by providing further data, we examined neuropathological and clinical effects upon i.c. transmission of brain, stomach wall and muscle tissue as well as blood from PD patients in TgM83 +/− mice up to 612 dpi. This revealed a subtle, yet distinctive stimulation of localized αSyn aggregation in the somatodendritic compartment and dystrophic neurites of individual or focally clustered cerebral neurons after challenge with brain and stomach wall homogenates. No such effect was observed with transmitted blood or homogenized muscle tissue. 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PD-associated αSyn (αSyn PD ) aggregates can act as proteinaceous nuclei (“seeds”) able of self-templated propagation. Since this is strikingly reminiscent to properties of proteinaceous infectious particles (prions), lessons learned from prion diseases suggest to test whether transferred αSyn PD can propagate and induce neurological impairments or disease in a new host. Two studies that addressed this question provided divergent results. Intracerebral (i.c.) injection of Lewy body extracts from PD patients caused cerebral αSyn pathology, as well as nigrostriatal neurodegeneration, of wild-type mice and macaques, with the mice also showing motor impairments (Recasens et al. 2014, Ann Neurol 75:351–362). 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The detected stimulation of αSyn aggregation was not accompanied by apparent motor impairments or overt neurological disease in TgM83 +/− mice. Our study substantiated that transmitted αSyn PD seeds, including those from the stomach wall, are able to propagate in new mammalian hosts. The consequences of such propagation and potential safeguards need to be further investigated.</abstract><cop>Berlin/Heidelberg</cop><pub>Springer Berlin Heidelberg</pub><pmid>33895878</pmid><doi>10.1007/s00401-021-02312-4</doi><tpages>19</tpages><orcidid>https://orcid.org/0000-0002-6454-6657</orcidid><oa>free_for_read</oa></addata></record>
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subjects alpha-Synuclein - administration & dosage
alpha-Synuclein - blood
alpha-Synuclein - isolation & purification
alpha-Synuclein - metabolism
Animals
Axons
Brain
Brain - pathology
Enteric Nervous System - pathology
Humans
Injection
Lewy bodies
Lewy Bodies - pathology
Medicine
Medicine & Public Health
Mice
Movement disorders
Muscle, Skeletal - pathology
Neurodegeneration
Neurodegenerative diseases
Neurological diseases
Neurons - pathology
Neuropathology
Neurosciences
Original Paper
Parkinson Disease - metabolism
Parkinson Disease - pathology
Parkinson's disease
Pathology
Prion protein
Prions
Protein seeding
Seeds
Stomach
Stomach - pathology
Synuclein
Transgenic mice
title Transmissible α-synuclein seeding activity in brain and stomach of patients with Parkinson’s disease
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