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Dobreva I, Thomas J, Marr A, O'Connell R, Roche M, Hannaway N, Dore C, Rose S, Liu K, Bhome R, Baldwin-Jones S, Roberts J, Archibald N, Alston D, Amar K, Edwards E, Foley JA, Haunton VJ, Henderson EJ, Jha A, Lindop F, Magee C, Massey L, Ruiz-Mendoza E, Mohamed B, Patterson K, Ramaswamy B, Schrag A, Silverdale M, Suárez-González A, Subramanian I, Foltynie T, Williams-Gray CH, Yarnall AJ, Carroll C, Bale C, Hugill C, Weil RS. Improving Conversations about Parkinson's Dementia. Mov Disord Clin Pract 2024. [PMID: 38696333 DOI: 10.1002/mdc3.14054] [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: 11/17/2023] [Revised: 04/05/2024] [Accepted: 04/08/2024] [Indexed: 05/04/2024] Open
Abstract
BACKGROUND People with Parkinson's disease (PD) have an increased risk of dementia, yet patients and clinicians frequently avoid talking about it due to associated stigma, and the perception that "nothing can be done about it". However, open conversations about PD dementia may allow people with the condition to access treatment and support, and may increase participation in research aimed at understanding PD dementia. OBJECTIVES To co-produce information resources for patients and healthcare professionals to improve conversations about PD dementia. METHODS We worked with people with PD, engagement experts, artists, and a PD charity to open up these conversations. 34 participants (16 PD; 6 PD dementia; 1 Parkinsonism, 11 caregivers) attended creative workshops to examine fears about PD dementia and develop information resources. 25 PD experts contributed to the resources. RESULTS While most people with PD (70%) and caregivers (81%) shared worries about cognitive changes prior to the workshops, only 38% and 30%, respectively, had raised these concerns with a healthcare professional. 91% of people with PD and 73% of caregivers agreed that PD clinicians should ask about cognitive changes routinely through direct questions and perform cognitive tests at clinic appointments. We used insights from the creative workshops, and input from a network of PD experts to co-develop two open-access resources: one for people with PD and their families, and one for healthcare professionals. CONCLUSION Using artistic and creative workshops, co-learning and striving for diverse voices, we co-produced relevant resources for a wider audience to improve conversations about PD dementia.
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Affiliation(s)
- Ivelina Dobreva
- Dementia Research Centre, Queen Square Institute of Neurology, University College London, Russell Square House, London, United Kingdom
| | - Joanne Thomas
- Wellcome Centre for Human Neuroimaging, London, United Kingdom
| | - Anne Marr
- Central Saint Martins, University of the Arts, London, United Kingdom
| | | | - Moïse Roche
- Division of Psychiatry, University College London, London, United Kingdom
| | - Naomi Hannaway
- Dementia Research Centre, Queen Square Institute of Neurology, University College London, Russell Square House, London, United Kingdom
| | - Charlotte Dore
- Wellcome Centre for Human Neuroimaging, London, United Kingdom
| | - Sian Rose
- Wellcome Centre for Human Neuroimaging, London, United Kingdom
| | - Ken Liu
- Wellcome Centre for Human Neuroimaging, London, United Kingdom
| | - Rohan Bhome
- Dementia Research Centre, Queen Square Institute of Neurology, University College London, Russell Square House, London, United Kingdom
| | | | | | - Neil Archibald
- South Tees Hospital NHS Foundation Trust, Middlesbrough, United Kingdom
| | | | - Khaled Amar
- Royal Bournemouth Hospital, NHS Foundation Trust, Bournemouth, United Kingdom
| | | | - Jennifer A Foley
- Department of Neuropsychology, National Hospital for Neurology and Neurosurgery, Queen Square, London, United Kingdom
- UCL Queen Square Institute of Neurology, Univeristy College London, London, United Kingdom
| | | | - Emily J Henderson
- Ageing and Movement Research Group, Bristol Medical School, University of Bristol, Bristol, United Kingdom
- Older People's Unit, Royal United Hospitals NHS Foundation Trust, Bath, United Kingdom
| | - Ashwani Jha
- UCL Queen Square Institute of Neurology, Univeristy College London, London, United Kingdom
| | - Fiona Lindop
- Parkinson's UK, London, United Kingdom
- Derby Hospitals NHS Foundation Trust, Derby, United Kingdom
| | - Cathy Magee
- National Hospital for Neurology and Neurosurgery, London, United Kingdom
| | - Luke Massey
- Poole Hospital NHS Foundation Trust, Poole, United Kingdom
| | - Eladia Ruiz-Mendoza
- North West Anglia NHS Foundation Trust, Peterborough City Hospital, Peterborough, United Kingdom
| | - Biju Mohamed
- University Hospital of Wales, Cardiff, United Kingdom
| | - Katherine Patterson
- Dementia Research Centre, Queen Square Institute of Neurology, University College London, Russell Square House, London, United Kingdom
| | - Bhanu Ramaswamy
- Parkinson's UK, London, United Kingdom
- Sheffield Hallam University, Sheffield, United Kingdom
| | - Anette Schrag
- Department of Clinical Neuroscience, Institute of Neurology, UCL, London, United Kingdom
| | - Monty Silverdale
- Department of Neurology, Salford Royal NHS Foundation Trust, Manchester Academic Health Science Centre, University of Manchester, Manchester, United Kingdom
| | - Aida Suárez-González
- Dementia Research Centre, Queen Square Institute of Neurology, University College London, Russell Square House, London, United Kingdom
| | - Indu Subramanian
- Department of Neurology, David Geffen School of Medicine, Los Angeles, California, USA
- Parkinson's Disease Research, Education, and Clinical Center (PADRECC), Veterans Administration Greater Los Angeles Health Care System, Los Angeles, California, USA
| | - Tom Foltynie
- UCL Queen Square Institute of Neurology, Univeristy College London, London, United Kingdom
- National Hospital for Neurology and Neurosurgery, London, United Kingdom
| | - Caroline H Williams-Gray
- Department of Clinical Neurosciences, University of Cambridge, United Kingdom
- Cambridge University Hospitals NHS Trust, Cambridge, United Kingdom
| | - Alison J Yarnall
- Translational and Clinical Research Institute, Newcastle University, Newcastle, United Kingdom
| | - Camille Carroll
- Faculty of Health, University of Plymouth, Drake Circus, Plymouth, United Kingdom
| | | | | | - Rimona S Weil
- Dementia Research Centre, Queen Square Institute of Neurology, University College London, Russell Square House, London, United Kingdom
- Wellcome Centre for Human Neuroimaging, London, United Kingdom
- UCL Queen Square Institute of Neurology, Univeristy College London, London, United Kingdom
- National Hospital for Neurology and Neurosurgery, London, United Kingdom
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McAdam EL, Hugill C, Fort S, Samain E, Cottaz S, Davies NW, Reid JB, Foo E. Determining the Site of Action of Strigolactones during Nodulation. Plant Physiol 2017; 175:529-542. [PMID: 28751316 PMCID: PMC5580767 DOI: 10.1104/pp.17.00741] [Citation(s) in RCA: 38] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/01/2017] [Accepted: 07/26/2017] [Indexed: 05/07/2023]
Abstract
Strigolactones (SLs) influence the ability of legumes to associate with nitrogen-fixing bacteria. In this study, we determine the precise stage at which SLs influence nodulation. We show that SLs promote infection thread formation, as a null SL-deficient pea (Pisum sativum) mutant forms significantly fewer infection threads than wild-type plants, and this reduction can be overcome by the application of the synthetic SL GR24. We found no evidence that SLs influence physical events in the plant before or after infection thread formation, since SL-deficient plants displayed a similar ability to induce root hair curling in response to rhizobia or Nod lipochitooligosaccharides (LCOs) and SL-deficient nodules appear to fix nitrogen at a similar rate to those of wild-type plants. In contrast, an SL receptor mutant displayed no decrease in infection thread formation or nodule number, suggesting that SL deficiency may influence the bacterial partner. We found that this influence of SL deficiency was not due to altered flavonoid exudation or the ability of root exudates to stimulate bacterial growth. The influence of SL deficiency on infection thread formation was accompanied by reduced expression of some early nodulation genes. Importantly, SL synthesis is down-regulated by mutations in genes of the Nod LCO signaling pathway, and this requires the downstream transcription factor NSP2 but not NIN This, together with the fact that the expression of certain SL biosynthesis genes can be elevated in response to rhizobia/Nod LCOs, suggests that Nod LCOs may induce SL biosynthesis. SLs appear to influence nodulation independently of ethylene action, as SL-deficient and ethylene-insensitive double mutant plants display essentially additive phenotypes, and we found no evidence that SLs influence ethylene synthesis or vice versa.
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Affiliation(s)
- Erin L McAdam
- School of Biological Sciences, University of Tasmania, Hobart, Tasmania 7001, Australia
| | - Cassandra Hugill
- School of Biological Sciences, University of Tasmania, Hobart, Tasmania 7001, Australia
| | - Sebastien Fort
- Universite Grenoble Alpes, Centre National de la Recherche Scientifique, Centre de Recherches sur les Macromolécules Végétales, F-38000 Grenoble, France
| | - Eric Samain
- Universite Grenoble Alpes, Centre National de la Recherche Scientifique, Centre de Recherches sur les Macromolécules Végétales, F-38000 Grenoble, France
| | - Sylvain Cottaz
- Universite Grenoble Alpes, Centre National de la Recherche Scientifique, Centre de Recherches sur les Macromolécules Végétales, F-38000 Grenoble, France
| | - Noel W Davies
- Central Science Laboratory, University of Tasmania, Hobart, Tasmania 7001, Australia
| | - James B Reid
- School of Biological Sciences, University of Tasmania, Hobart, Tasmania 7001, Australia
| | - Eloise Foo
- School of Biological Sciences, University of Tasmania, Hobart, Tasmania 7001, Australia
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Foo E, Yoneyama K, Hugill C, Quittenden LJ, Reid JB. Strigolactones: Internal and external signals in plant symbioses? Plant Signal Behav 2013; 8:e23168. [PMID: 23299321 PMCID: PMC3676486 DOI: 10.4161/psb.23168] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/21/2012] [Revised: 12/06/2012] [Accepted: 12/07/2012] [Indexed: 05/18/2023]
Abstract
As the newest plant hormone, strigolactone research is undergoing an exciting expansion. In less than five years, roles for strigolactones have been defined in shoot branching, secondary growth, root growth and nodulation, to add to the growing understanding of their role in arbuscular mycorrhizae and parasitic weed interactions. Strigolactones are particularly fascinating as signaling molecules as they can act both inside the plant as an endogenous hormone and in the soil as a rhizosphere signal. Our recent research has highlighted such a dual role for strigolactones, potentially acting as both an endogenous and exogenous signal for arbuscular mycorrhizal development. There is also significant interest in examining strigolactones as putative regulators of responses to environmental stimuli, especially the response to nutrient availability, given the strong regulation of strigolactone production by nitrate and phosphate observed in many species. In particular, the potential for strigolactones to mediate the ecologically important response of mycorrhizal colonization to phosphate has been widely discussed. However, using a mutant approach we found that strigolactones are not essential for phosphate regulation of mycorrhizal colonization or nodulation. This is consistent with the relatively mild impairment of phosphate control of seedling root growth observed in Arabidopsis strigolactone mutants. This contrasts with the major role for strigolactones in phosphate control of shoot branching of rice and Arabidopsis and indicates that the integration of strigolactones into our understanding of nutrient response will be complex. New data presented here, along with the recent discovery of phosphate specific CLE peptides, indicates a potential role for PsNARK, a component of the autoregulation of nodulation pathway, in phosphate control of nodulation.
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Affiliation(s)
- Eloise Foo
- School of Plant Science; University of Tasmania; Hobart, TAS Australia
| | - Kaori Yoneyama
- Weed Science Centre; Utsunomiya University; Utsunomiya, Japan
| | - Cassandra Hugill
- School of Plant Science; University of Tasmania; Hobart, TAS Australia
| | | | - James B. Reid
- School of Plant Science; University of Tasmania; Hobart, TAS Australia
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