1
|
Laurencin C, Lancelot S, Brosse S, Mérida I, Redouté J, Greusard E, Lamberet L, Liotier V, Le Bars D, Costes N, Thobois S, Boulinguez P, Ballanger B. Noradrenergic alterations in Parkinson's disease: a combined 11C-yohimbine PET/neuromelanin MRI study. Brain 2024; 147:1377-1388. [PMID: 37787503 PMCID: PMC10994534 DOI: 10.1093/brain/awad338] [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: 06/27/2023] [Revised: 09/05/2023] [Accepted: 09/19/2023] [Indexed: 10/04/2023] Open
Abstract
Degeneration of the noradrenergic system is now considered a pathological hallmark of Parkinson's disease, but little is known about its consequences in terms of parkinsonian manifestations. Here, we evaluated two aspects of the noradrenergic system using multimodal in vivo imaging in patients with Parkinson's disease and healthy controls: the pigmented cell bodies of the locus coeruleus with neuromelanin sensitive MRI; and the density of α2-adrenergic receptors (ARs) with PET using 11C-yohimbine. Thirty patients with Parkinson's disease and 30 age- and sex-matched healthy control subjects were included. The characteristics of the patients' symptoms were assessed using the Movement Disorder Society Unified Parkinson's Disease Rating Scale (MDS-UPDRS). Patients showed reduced neuromelanin signal intensity in the locus coeruleus compared with controls and diminished 11C-yohimbine binding in widespread cortical regions, including the motor cortex, as well as in the insula, thalamus and putamen. Clinically, locus coeruleus neuronal loss was correlated with motor (bradykinesia, motor fluctuations, tremor) and non-motor (fatigue, apathy, constipation) symptoms. A reduction of α2-AR availability in the thalamus was associated with tremor, while a reduction in the putamen, the insula and the superior temporal gyrus was associated with anxiety. These results highlight a multifaceted alteration of the noradrenergic system in Parkinson's disease since locus coeruleus and α2-AR degeneration were found to be partly uncoupled. These findings raise important issues about noradrenergic dysfunction that may encourage the search for new drugs targeting this system, including α2-ARs, for the treatment of Parkinson's disease.
Collapse
Affiliation(s)
- Chloé Laurencin
- Lyon Neuroscience Research Center (CRNL), INSERM U1028, CNRS UMR5292, University Lyon 1, F-69000 Lyon, France
- Department of Neurology C, Expert Parkinson Centre, Hospices Civils de Lyon, Pierre Wertheimer Neurological Hospital, NS-Park/F-CRIN, 69500 Bron, France
| | - Sophie Lancelot
- Lyon Neuroscience Research Center (CRNL), INSERM U1028, CNRS UMR5292, University Lyon 1, F-69000 Lyon, France
- CERMEP-Imagerie du Vivant, PET-MRI Department, 69500 Bron, France
| | - Sarah Brosse
- Lyon Neuroscience Research Center (CRNL), INSERM U1028, CNRS UMR5292, University Lyon 1, F-69000 Lyon, France
| | - Inés Mérida
- CERMEP-Imagerie du Vivant, PET-MRI Department, 69500 Bron, France
| | - Jérôme Redouté
- CERMEP-Imagerie du Vivant, PET-MRI Department, 69500 Bron, France
| | - Elise Greusard
- CERMEP-Imagerie du Vivant, PET-MRI Department, 69500 Bron, France
| | - Ludovic Lamberet
- CERMEP-Imagerie du Vivant, PET-MRI Department, 69500 Bron, France
| | | | - Didier Le Bars
- CERMEP-Imagerie du Vivant, PET-MRI Department, 69500 Bron, France
| | - Nicolas Costes
- CERMEP-Imagerie du Vivant, PET-MRI Department, 69500 Bron, France
| | - Stéphane Thobois
- Department of Neurology C, Expert Parkinson Centre, Hospices Civils de Lyon, Pierre Wertheimer Neurological Hospital, NS-Park/F-CRIN, 69500 Bron, France
- Institut des Sciences Cognitives Marc Jeannerod, UMR 5229, CNRS, 69500 Bron, France
| | - Philippe Boulinguez
- Lyon Neuroscience Research Center (CRNL), INSERM U1028, CNRS UMR5292, University Lyon 1, F-69000 Lyon, France
| | - Bénédicte Ballanger
- Lyon Neuroscience Research Center (CRNL), INSERM U1028, CNRS UMR5292, University Lyon 1, F-69000 Lyon, France
| |
Collapse
|
2
|
Ganachaud C, Ganière C, Hacques G, Rochat N, Seifert L, Adé D. Exploring in a climbing task during a learning protocol: a complex sense-making process. Psychol Res 2023; 87:2365-2379. [PMID: 37027038 DOI: 10.1007/s00426-023-01817-9] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/13/2022] [Accepted: 03/16/2023] [Indexed: 04/08/2023]
Abstract
In perceptual-motor learning, constant and variable practice conditions have been found to have differential effects on learners' exploratory activity and their ability to transfer their skills to novel environments. However, how learners make sense of these practice conditions during practice remains unclear. This study aimed to analyse learners' experiences of different practice conditions during a climbing learning protocol and to examine how these experiences might further inform learners' exploratory activity. Twelve participants assigned to either 'Constant practice', 'Imposed Novelty', or 'Chosen novelty' groups climbed a 'Control route' (i.e. a route common to all groups) and a 'transfer route' (i.e. a new route) before and after a ten session learning protocol. Descriptions of learners' experiences during previews and climbs were collected using self-confrontation interviews. After identifying general dimensions via a thematic analysis, a hierarchical cluster analysis on these general dimensions allowed the identification of phenomenological clusters (PhC). The distribution of these PhCs was compared between the first and last learning sessions, the control and transfer routes, and the practice condition groups. We identified seven PhCs reflecting learners' meaningful exploratory activity during the previews and climbs. Significant differences in the distribution of these PhCs were found between (i) the first and the last session, (ii) the control and the transfer route and (iii) the Chosen-novelty group and the other two practice groups. These results suggest that exploration is part of a complex sense-making process linked to practice conditions, which can be described by a joint analysis of the intentions, perceptions and actions.
Collapse
Affiliation(s)
| | - Caroline Ganière
- University Clermont Auvergne, ACTé, 63000, Clermont-Ferrand, France
| | | | - Nadège Rochat
- University Clermont Auvergne, ACTé, 63000, Clermont-Ferrand, France
| | | | - David Adé
- University of Rouen Normandy, CETAPS, 76000, Rouen, France
| |
Collapse
|
3
|
Kim JH, Rosenfeld J, Kim YC, Choe S, Composto RJ, Lee D, Dreyfus R. Polymer-Grafted, Gold Nanoparticle-Based Nano-Capsules as Reversible Colorimetric Tensile Strain Sensors. Small 2023; 19:e2300361. [PMID: 37140078 DOI: 10.1002/smll.202300361] [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] [Subscribe] [Scholar Register] [Received: 01/12/2023] [Revised: 03/29/2023] [Indexed: 05/05/2023]
Abstract
Colloidal colorimetric microsensors enable the in-situ detection of mechanical strains within materials. Enhancing the sensitivity of these sensors to small scale deformation while enabling reversibility of the sensing capability would expand their utility in applications including biosensing and chemical sensing. In this study, we introduce the synthesis of colloidal colorimetric nano-sensors using a simple and readily scalable fabrication method. Colloidal nano sensors are prepared by emulsion-templated assembly of polymer-grafted gold nanoparticles (AuNP). To direct the adsorption of AuNP to the oil-water interface of emulsion droplets, AuNP (≈11nm) are functionalized with thiol-terminated polystyrene (PS, Mn = 11k). These PS-grafted gold nanoparticles are suspended in toluene and subsequently emulsified to form droplets with a diameter of ≈30µm. By evaporating the solvent of the oil-inwater emulsion, we form nanocapsules (AuNC) (diameter < 1µm) decorated by PS-grafted AuNP. To test mechanical sensing, the AuNC are embedded in an elastomer matrix. The addition of a plasticizer reduces the glass transition temperature of the PS brushes, and in turn imparts reversible deformability to the AuNC. The plasmonic peak of the AuNC shifts towards lower wavelengths upon application of uniaxial tensile tension, indicating increased inter-nanoparticle distance, and reverts back as the tension is released.
Collapse
Affiliation(s)
- Jae-Hyun Kim
- Department of Chemical and Biomolecular Engineering, University of Pennsylvania, Philadelphia, Pennsylvania, 19104, USA
| | - Joseph Rosenfeld
- Department of Chemical and Biomolecular Engineering, University of Pennsylvania, Philadelphia, Pennsylvania, 19104, USA
| | - Ye Chan Kim
- Department of Materials Science and Engineering, University of Pennsylvania, Philadelphia, Pennsylvania, 19104, USA
| | - Sean Choe
- Complex Assemblies of Soft Matter Laboratory (COMPASS), UMI 3254, CNRS-Solvay-University of Pennsylvania, CRTB, Bristol, PA, 19007, USA
| | - Russell J Composto
- Department of Chemical and Biomolecular Engineering, University of Pennsylvania, Philadelphia, Pennsylvania, 19104, USA
- Department of Materials Science and Engineering, University of Pennsylvania, Philadelphia, Pennsylvania, 19104, USA
| | - Daeyeon Lee
- Department of Chemical and Biomolecular Engineering, University of Pennsylvania, Philadelphia, Pennsylvania, 19104, USA
| | - Rémi Dreyfus
- Complex Assemblies of Soft Matter Laboratory (COMPASS), UMI 3254, CNRS-Solvay-University of Pennsylvania, CRTB, Bristol, PA, 19007, USA
- Laboratoire Nanotechnologies Nanosystemes (LN2), CNRS - Université de Sherbrooke, Quebec, J1K 0A5, Canada
| |
Collapse
|
4
|
Huc J, Dziasek K, Pachamuthu K, Woh T, Köhler C, Borges F. Bypassing reproductive barriers in hybrid seeds using chemically induced epimutagenesis. Plant Cell 2022; 34:989-1001. [PMID: 34792584 PMCID: PMC8894923 DOI: 10.1093/plcell/koab284] [Citation(s) in RCA: 12] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/23/2021] [Accepted: 11/09/2021] [Indexed: 05/13/2023]
Abstract
The triploid block, which prevents interploidy hybridizations in flowering plants, is characterized by a failure in endosperm development, arrest in embryogenesis, and seed collapse. Many genetic components of triploid seed lethality have been successfully identified in the model plant Arabidopsis thaliana, most notably the paternally expressed genes (PEGs), which are upregulated in tetraploid endosperm with paternal excess. Previous studies have shown that the paternal epigenome is a key determinant of the triploid block response, as the loss of DNA methylation in diploid pollen suppresses the triploid block almost completely. Here, we demonstrate that triploid seed collapse is bypassed in Arabidopsis plants treated with the DNA methyltransferase inhibitor 5-Azacytidine during seed germination and early growth. We identified strong suppressor lines showing stable transgenerational inheritance of hypomethylation in the CG context, as well as normalized expression of PEGs in triploid seeds. Importantly, differentially methylated loci segregate in the progeny of "epimutagenized" plants, which may allow epialleles involved in the triploid block response to be identified in future studies. Finally, we demonstrate that chemically induced epimutagenesis facilitates hybridization between different Capsella species, thus potentially emerging as a strategy for producing triploids and interspecific hybrids with high agronomic interest.
Collapse
Affiliation(s)
- Jonathan Huc
- Institut Jean-Pierre Bourgin, INRAE, AgroParisTech, Université Paris-Saclay, 78000, Versailles, France
| | - Katarzyna Dziasek
- Department of Plant Biology, Uppsala Biocenter, Swedish University of Agricultural Sciences, Linnean Center of Plant Biology, Uppsala, Sweden
| | - Kannan Pachamuthu
- Institut Jean-Pierre Bourgin, INRAE, AgroParisTech, Université Paris-Saclay, 78000, Versailles, France
| | - Tristan Woh
- Institut Jean-Pierre Bourgin, INRAE, AgroParisTech, Université Paris-Saclay, 78000, Versailles, France
| | - Claudia Köhler
- Department of Plant Biology, Uppsala Biocenter, Swedish University of Agricultural Sciences, Linnean Center of Plant Biology, Uppsala, Sweden
- Max Planck Institute of Molecular Plant Physiology, Potsdam-Golm, Germany
| | - Filipe Borges
- Institut Jean-Pierre Bourgin, INRAE, AgroParisTech, Université Paris-Saclay, 78000, Versailles, France
- Author for correspondence:
| |
Collapse
|
5
|
Dou S, Villa-Vialaneix N, Liaubet L, Billon Y, Giorgi M, Gilbert H, Gourdine JL, Riquet J, Renaudeau D. 1HNMR-Based metabolomic profiling method to develop plasma biomarkers for sensitivity to chronic heat stress in growing pigs. PLoS One 2017; 12:e0188469. [PMID: 29176781 PMCID: PMC5703499 DOI: 10.1371/journal.pone.0188469] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.1] [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: 08/11/2017] [Accepted: 11/07/2017] [Indexed: 11/19/2022] Open
Abstract
The negative impact of heat stress (HS) on the production performances in pig faming is of particular concern. Novel diagnostic methods are needed to predict the robustness of pigs to HS. Our study aimed to assess the reliability of blood metabolome to predict the sensitivity to chronic HS of 10 F1 (Large White × Creole) sire families (SF) reared in temperate (TEMP) and in tropical (TROP) regions (n = 56±5 offsprings/region/SF). Live body weight (BW) and rectal temperature (RT) were recorded at 23 weeks of age. Average daily feed intake (AFDI) and average daily gain were calculated from weeks 11 to 23 of age, together with feed conversion ratio. Plasma blood metabolome profiles were obtained by Nuclear Magnetic Resonance spectroscopy (1HNMR) from blood samples collected at week 23 in TEMP. The sensitivity to hot climatic conditions of each SF was estimated by computing a composite index of sensitivity (Isens) derived from a linear combination of t statistics applied to familial BW, ADFI and RT in TEMP and TROP climates. A model of prediction of sensitivity was established with sparse Partial Least Square Discriminant Analysis (sPLS-DA) between the two most robust SF (n = 102) and the two most sensitive ones (n = 121) using individual metabolomic profiles measured in TEMP. The sPLS-DA selected 29 buckets that enabled 78% of prediction accuracy by cross-validation. On the basis of this training, we predicted the proportion of sensitive pigs within the 6 remaining families (n = 337). This proportion was defined as the predicted membership of families to the sensitive category. The positive correlation between this proportion and Isens (r = 0.97, P < 0.01) suggests that plasma metabolome can be used to predict the sensitivity of pigs to hot climate.
Collapse
Affiliation(s)
- Samir Dou
- PEGASE, INRA, Agrocampus Ouest, St Gilles, France
| | | | - Laurence Liaubet
- GenPhySE, INRA, Université de Toulouse, INP, ENSAT, ENVT, Castanet Tolosan, France
| | - Yvon Billon
- PTEA, INRA, Petit-Bourg (Guadeloupe), France
| | | | - Hélène Gilbert
- GenPhySE, INRA, Université de Toulouse, INP, ENSAT, ENVT, Castanet Tolosan, France
| | | | - Juliette Riquet
- GenPhySE, INRA, Université de Toulouse, INP, ENSAT, ENVT, Castanet Tolosan, France
| | | |
Collapse
|