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Gomez-Collignon A, Brown R, Carr A, Dakin S, Lach A, Loizou C, Rogers M, Sharp R, Kendal A. Single cell multi-omics characterise discrete human tendon cells populations that persist in vitro and on fibrous scaffolds. Eur Cell Mater 2022; 44:1-20. [PMID: 35916474 DOI: 10.22203/ecm.v044a01] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/31/2023] Open
Abstract
Chronic tendinopathy represents a growing healthcare burden in the ageing global population. Curative therapies remain elusive as the mechanisms that underlie chronic inflammation in tendon disease remain unclear. Identifying and isolating key pathogenic and reparative cells is essential in developing precision therapies and implantable materials for improved tendon healing. Multiple discrete human tendon cell populations have been previously described ex vivo. To determine if these populations persist in vitro, healthy human hamstring tenocytes were cultured for 8 d on either tissue culture plastic or aligned electrospun fibres of absorbable polydioxanone. Novel single-cell surface proteomics combined with unbiased single-cell transcriptomics (CITE-Seq) was used to identify discrete tenocyte populations. 6 cell populations were found, 4 of which shared key gene expression determinants with ex vivo human cell clusters: PTX3_PAPPA, POSTN_SCX, DCN_LUM and ITGA7_NES. Surface proteomics found that PTX3_PAPPA cells were CD10+CD26+CD54+. ITGA7_NES cells were CD146+ and POSTN_SCX cells were CD90+CD95+CD10+. Culture on the aligned electrospun fibres favoured 3 cell subtypes (DCN_LUM, POSTN_SCX and PTX3_ PAPPA), promoting high expression of tendon-matrix-associated genes and upregulating gene sets enriched for TNF-a and IL-6/STAT3 signalling. Discrete human tendon cell subpopulations persisted in in vitro culture and could be recognised by specific gene and surface-protein signatures. Aligned polydioxanone fibres promoted the survival of 3 clusters, including pro-inflammatory PTX3-expressing CD10+CD26+CD54+ cells found in chronic tendon disease. These results improved the understanding of preferred culture conditions for different tenocyte subpopulations and informed the development of in vitro models of tendon disease.
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Kendal AR, Layton T, Al-Mossawi H, Appleton L, Dakin S, Brown R, Loizou C, Rogers M, Sharp R, Carr A. Multi-omic single cell analysis resolves novel stromal cell populations in healthy and diseased human tendon. Sci Rep 2020; 10:13939. [PMID: 32883960 PMCID: PMC7471282 DOI: 10.1038/s41598-020-70786-5] [Citation(s) in RCA: 59] [Impact Index Per Article: 14.8] [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: 03/06/2020] [Accepted: 07/27/2020] [Indexed: 12/24/2022] Open
Abstract
Tendinopathy accounts for over 30% of primary care consultations and represents a growing healthcare challenge in an active and increasingly ageing population. Recognising critical cells involved in tendinopathy is essential in developing therapeutics to meet this challenge. Tendon cells are heterogenous and sparsely distributed in a dense collagen matrix; limiting previous methods to investigate cell characteristics ex vivo. We applied next generation CITE-sequencing; combining surface proteomics with in-depth, unbiased gene expression analysis of > 6400 single cells ex vivo from 11 chronically tendinopathic and 8 healthy human tendons. Immunohistochemistry validated the single cell findings. For the first time we show that human tendon harbours at least five distinct COL1A1/2 expressing tenocyte populations in addition to endothelial cells, T-cells, and monocytes. These consist of KRT7/SCX+ cells expressing microfibril associated genes, PTX3+ cells co-expressing high levels of pro-inflammatory markers, APOD+ fibro–adipogenic progenitors, TPPP3/PRG4+ chondrogenic cells, and ITGA7+ smooth muscle-mesenchymal cells. Surface proteomic analysis identified markers by which these sub-classes could be isolated and targeted in future. Chronic tendinopathy was associated with increased expression of pro-inflammatory markers PTX3, CXCL1, CXCL6, CXCL8, and PDPN by microfibril associated tenocytes. Diseased endothelium had increased expression of chemokine and alarmin genes including IL33.
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Affiliation(s)
- Adrian R Kendal
- The Nuffield Department of Orthopaedics, Rheumatology and Musculoskeletal Sciences, Botnar Research Centre, Windmill Road, Oxford, OX3 7LD, UK. .,Nuffield Orthopaedic Centre, Windmill Road, Oxford, OX3 7LD, UK.
| | - Thomas Layton
- The Nuffield Department of Orthopaedics, Rheumatology and Musculoskeletal Sciences, Botnar Research Centre, Windmill Road, Oxford, OX3 7LD, UK
| | - Hussein Al-Mossawi
- The Nuffield Department of Orthopaedics, Rheumatology and Musculoskeletal Sciences, Botnar Research Centre, Windmill Road, Oxford, OX3 7LD, UK
| | - Louise Appleton
- The Nuffield Department of Orthopaedics, Rheumatology and Musculoskeletal Sciences, Botnar Research Centre, Windmill Road, Oxford, OX3 7LD, UK
| | - Stephanie Dakin
- The Nuffield Department of Orthopaedics, Rheumatology and Musculoskeletal Sciences, Botnar Research Centre, Windmill Road, Oxford, OX3 7LD, UK
| | - Rick Brown
- Nuffield Orthopaedic Centre, Windmill Road, Oxford, OX3 7LD, UK
| | | | - Mark Rogers
- Nuffield Orthopaedic Centre, Windmill Road, Oxford, OX3 7LD, UK
| | - Robert Sharp
- Nuffield Orthopaedic Centre, Windmill Road, Oxford, OX3 7LD, UK
| | - Andrew Carr
- The Nuffield Department of Orthopaedics, Rheumatology and Musculoskeletal Sciences, Botnar Research Centre, Windmill Road, Oxford, OX3 7LD, UK
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Baldwin M, Snelling S, Dakin S, Carr A. Augmenting endogenous repair of soft tissues with nanofibre scaffolds. J R Soc Interface 2019; 15:rsif.2018.0019. [PMID: 29695606 DOI: 10.1098/rsif.2018.0019] [Citation(s) in RCA: 17] [Impact Index Per Article: 3.4] [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: 01/09/2018] [Accepted: 04/04/2018] [Indexed: 12/21/2022] Open
Abstract
As our ability to engineer nanoscale materials has developed we can now influence endogenous cellular processes with increasing precision. Consequently, the use of biomaterials to induce and guide the repair and regeneration of tissues is a rapidly developing area. This review focuses on soft tissue engineering, it will discuss the types of biomaterial scaffolds available before exploring physical, chemical and biological modifications to synthetic scaffolds. We will consider how these properties, in combination, can provide a precise design process, with the potential to meet the requirements of the injured and diseased soft tissue niche. Finally, we frame our discussions within clinical trial design and the regulatory framework, the consideration of which is fundamental to the successful translation of new biomaterials.
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Affiliation(s)
- Mathew Baldwin
- Nuffield Department of Orthopaedics, Rheumatology and Musculoskeletal Sciences, University of Oxford, Oxford, UK
| | - Sarah Snelling
- Nuffield Department of Orthopaedics, Rheumatology and Musculoskeletal Sciences, University of Oxford, Oxford, UK
| | - Stephanie Dakin
- Nuffield Department of Orthopaedics, Rheumatology and Musculoskeletal Sciences, University of Oxford, Oxford, UK
| | - Andrew Carr
- Nuffield Department of Orthopaedics, Rheumatology and Musculoskeletal Sciences, University of Oxford, Oxford, UK
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Narayan N, Carlucci F, Dakin S, Saleem A, Sabokbar A, Taylor PC. Basic science235. The Translocator Protein as a Marker of Macrophage and Stromal Activation in Inflammatory Arthritis: An Initial Investigation. Rheumatology (Oxford) 2017. [DOI: 10.1093/rheumatology/kex062.237] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
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Kendal A, Snelling S, Dakin S, Stace E, Mouthuy PA, Carr A. Resorbable electrospun polydioxanone fibres modify the behaviour of cells from both healthy and diseased human tendons. Eur Cell Mater 2017; 33:169-182. [PMID: 28266691 DOI: 10.22203/ecm.v033a13] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/31/2023] Open
Abstract
Chronic tendinopathy in an active and ageing population represents an increasing burden to healthcare systems. Rotator cuff tendinopathy alone accounts for approximately 70 % of all shoulder pain. Tendinopathic tissue has a disorganised extracellular matrix, altered vasculature, and infiltration of fibroblasts and inflammatory cells. This altered biology may contribute to the limited success of surgical repair strategies. Electrospun resorbable scaffolds can potentially enhance endogenous repair mechanisms by influencing the tissue microenvironment. Polydioxanone (PDO) has an established safety profile in patients. We compared the response of healthy and diseased human tendon cells to electrospun PDO fibres using live cell imaging, proliferation, flow cytometry, and gene expression studies. Within 4 h of initial contact with electrospun PDO, healthy tendon cells underwent a marked transformation; elongating along the fibres in a fibre density dependent manner. Diseased tendon cells initially responded at a slower rate, but ultimately underwent a similar morphological change. Electrospun fibres increased the proliferation rate of diseased tendon cells and increased the ratio of type I:IIIcollagenmRNA expression. Flow cytometry revealed decreased expression of CD106, a marker of mesenchymal stem cells, and increased expression of CD10 on healthy versus diseased tendon cells. PDO electrospun scaffolds further promoted CD106negCD10pos expression of healthy tendon cells. Despite their behavioural differences, both healthy and diseased human tendon cells responded to electrospun PDO fibres. This encourages further work establishing their efficacy in augmenting surgical repair of diseased tendons.
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Affiliation(s)
- A Kendal
- Botnar Research Centre, Nuffield Department of Orthopaedics, Rheumatology and Musculoskeletal Sciences, Biomedical Research Unit, Oxford University Institute of Musculoskeletal Sciences, University of Oxford, Oxford, OX3 7LD,
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Manning C, Dakin S, Tibber M, Charman T, Pellicano E. Increased sampling of motion signals in children with autism. J Vis 2014. [DOI: 10.1167/14.10.676] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022] Open
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Smith R, McIlwraith W, Schweitzer R, Kadler K, Cook J, Caterson B, Dakin S, Heinegård D, Screen H, Stover S, Crevier-Denoix N, Clegg P, Collins M, Little C, Frisbie D, Kjaer M, van Weeren R, Werpy N, Denoix JM, Carr A, Goldberg A, Bramlage L, Smith M, Nixon A. Advances in the understanding of tendinopathies: A report on the Second Havemeyer Workshop on equine tendon disease. Equine Vet J 2013; 46:4-9. [DOI: 10.1111/evj.12128] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
Affiliation(s)
- R. Smith
- Department of Veterinary Clinical Sciences and Services; The Royal Veterinary College; UK
| | - W. McIlwraith
- Clinical Sciences; Orthopaedic Research Center; Colorado State University; USA
| | - R. Schweitzer
- SOM-Cell and Developmental Biology Department; Oregon Health and Science University; USA
| | - K. Kadler
- Faculty of Life Sciences; University of Manchester; UK
| | - J. Cook
- Department of Physiotherapy; School of Primary Health Care; Monash University; Victoria Australia
| | | | - S. Dakin
- Department of Veterinary Clinical Sciences and Services; The Royal Veterinary College; UK
| | | | - H. Screen
- The School of Engineering and Materials Science; Queen Mary, University of London; UK
| | | | - N. Crevier-Denoix
- Ecole Vétérinaire d'Alfort; UMR INRA-ENVA BPLC (Biomécanique du Cheval); France
| | | | - M. Collins
- Department of Human Biology; UCT/MRC Research Unit for Exercise Science and Sports Medicine (ESSM); South Africa
| | - C. Little
- Raymond Purves Bone and Joint Research Laboratories; Kolling Institute of Medical Research; E25 - Royal North Shore Hospital; University of Sydney; New South Wales Australia
| | - D. Frisbie
- Clinical Sciences; Colorado State University; USA
| | - M. Kjaer
- Department of Clinical Medicine; Section of Orthopaedics and Internal Medicine; Bispejerg Hospital; Denmark
| | - R. van Weeren
- Equine Sciences; Utrecht University; the Netherlands
| | - N. Werpy
- Veterinary Medicine and Surgery; University of Florida; USA
| | | | - A. Carr
- Nuffield Department of Orthopaedics; Rheumatology and Musculoskeletal Sciences; Nuffield Orthopaedic Centre; University of Oxford; UK
| | | | - L. Bramlage
- Rood and Riddle Equine Hospital; Kentucky USA
| | | | - A. Nixon
- Clinical Sciences; Cornell University; New York USA
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Anderson E, Dakin S, Schwarzkopf DS, Rees G, Greenwood J. The Neural Correlates of Crowding-Induced Changes in Appearance. J Vis 2011. [DOI: 10.1167/11.11.1152] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022] Open
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Morgan M, Dakin S. Density discriminations are less precise than size discriminations, but are not more noisy. J Vis 2011. [DOI: 10.1167/11.11.1206] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022] Open
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Dakin S, Tibber M, Greenwood J, Kingdom F, Morgan M. The common perceptual metric for human discrimination of number and density. J Vis 2011. [DOI: 10.1167/11.11.1203] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022] Open
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Carlson T, Cho H, Turret J, Dakin S. Psychoanatomy of visual attention: a unified account of quadrant and hemifield effects. J Vis 2011. [DOI: 10.1167/11.11.101] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022] Open
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Greenwood J, Tailor V, Simmers A, Sloper J, Rubin G, Bex P, Dakin S. Links between acuity, crowding and binocularity in children with and without amblyopia. J Vis 2011. [DOI: 10.1167/11.11.405] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022] Open
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Dakin S, Seabright A, Wright B, Carlin P. Deficits in processing sensory context in schizophrenia. J Vis 2010. [DOI: 10.1167/10.15.31] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022] Open
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Greenwood J, Bex P, Dakin S. Crowding-induced changes in appearance: Bringing signal to the noise. J Vis 2010. [DOI: 10.1167/9.8.985] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022] Open
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Greenwood J, Bex P, Dakin S. Position and orientation are bound in crowding. J Vis 2010. [DOI: 10.1167/10.7.1344] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022] Open
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Kane D, Bex P, Dakin S. Humans assume isotropic orientation structure when solving the 'aperture problem' for motion. J Vis 2010. [DOI: 10.1167/10.7.832] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022] Open
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Kane D, Bex P, Dakin S. Reverse correlation reveals the limits of observers' ability to solve the aperture problem in translating natural scenes. J Vis 2010. [DOI: 10.1167/9.8.644] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022] Open
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Vishton C, Dakin S, Bex P. Contrast perception and contrast variance in natural scenes. J Vis 2010. [DOI: 10.1167/9.8.1047] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022] Open
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Anderson E, Dakin S, Rees G. A sub-cortical locus for brightness filling in. J Vis 2010. [DOI: 10.1167/7.9.240] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022] Open
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Cass J, Bex P, Watt R, Dakin S. Equivalent noise reveals that visual crowding is not an attentional effect. J Vis 2010. [DOI: 10.1167/7.9.339] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022] Open
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Dakin S, Apthorp D, Alais D. Judgment of absolute direction in natural scenes. J Vis 2010. [DOI: 10.1167/8.6.1026] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022] Open
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Dakin S, Omigie D. Face space: Distinctiveness, discrimination and dippers. J Vis 2010. [DOI: 10.1167/7.9.125] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022] Open
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Dakin S. Orientation integration: What gets lost during attentional diversions? J Vis 2010. [DOI: 10.1167/2.7.456] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022] Open
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Abstract
Recent evidence points to the importance of global operations across spatial regions larger than individual cortical receptive fields. Studies of contour integration and motion trajectory detection suggest that network operations between local detectors underlie the encoding of extended contours in space and extended trajectories in motion. Here we ask whether such network operations also occur between second-order-detectors known to exist in visual cortex. We compared performance for stimuli composed of either first-order or second-order elements equated for visibility, and we show that unlike the first-order case, there is little or no linking interaction between local second-order detectors. Near chance performance was found for elements defined by second-order attributes when observers had to identify either an elongated spatial contour or an extended motion trajectory embedded in noise elements. This implies that the network operations thought to underlie these two global tasks receive, at best, an impoverished input from local detectors that encode second-order image attributes.
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Affiliation(s)
- R F Hess
- McGill Vision Research, Department of Ophthalmology, McGill University, Quebec, Montreal, Canada.
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Dakin S, Garner M, Plura M. Understanding surgery: multimedia comes to theatre. Stud Health Technol Inform 1996; 46:153-8. [PMID: 10175389] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/11/2023]
Abstract
Educational technology is well established within Schools of Nursing, however there are few computer based learning packages within the clinical environment. It was felt within the Operating Services Directorate, Royal Hallamshire Hospital, that the development of a multimedia package would enhance and complement existing teaching methods. This paper describes the theory behind the choice of a multimedia presentation and its development within the operating theatres. The package, concentrating on general surgery, has been developed by two experienced theatre nurses and a graphic designer. This has resulted in a structured but flexible, fun package which is relevant to all learners within the operating theatre environment and allied healthcare fields. The feedback obtained from users within the clinical area has reinforced the project team's original feeling that multimedia is a highly appropriate resource for clinical education.
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Affiliation(s)
- S Dakin
- Operating Services Directorate, Royal Hallamshire Hospital, Sheffield, England
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Reed-Purvis S, Dakin S. Postnatal support. Listening: an under-valued health visiting skill. Health Visit 1993; 66:367-9. [PMID: 8244727] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
Abstract
The experience of being listened to can be a turning point in people's lives, particularly in the early months of parenthood, write Shona Reed-Purvis and Sally Dakin. This is a time when health visitors are ideally placed to offer emotional support. But training may be necessary to help the practitioner move beyond the traditional directive role engendered by old-style nurse training and expected by many clients, and to encourage the client to take control. Here they describe a training programme developed at the request of Oxford City health visitors to help them use their skills more effectively.
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Dakin S. 'Observations on temperature changes in patients undergoing insertion of a dynamic hip screw. Br J Theatre Nurs 1992; 2:27. [PMID: 1627855] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
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Dakin S. Inadvertent hypothermia--the results. NATNEWS 1989; 26:10-2. [PMID: 2733767] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
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