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Yovchev I, Maayan C, Simanovsky N, Foldes AJ, Brooks R, Kaplan L, Meiner Z, Cheishvili D. The Relationship Between Scoliosis, Spinal Bone Density, and Truncal Muscle Strength in Familial Dysautonomia Patients. Calcif Tissue Int 2024; 114:222-227. [PMID: 38030713 DOI: 10.1007/s00223-023-01164-2] [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] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/08/2023] [Accepted: 11/09/2023] [Indexed: 12/01/2023]
Abstract
This combined retrospective and prospective study aimed to investigate the relationship between scoliosis, spinal bone mineral density (BMD), and truncal muscle strength in patients with familial dysautonomia (FD). A total of 79 FD patients (40 male, 39 female) aged 5-44 years were included. The severity of scoliosis, lumbar spine BMD (Z-score), and truncal muscle strength were assessed. Correlations were analyzed using Pearson's correlation coefficient. Inverse correlations were observed between scoliosis severity and BMD (r = - 0.328, p = 0.001), as indicated by increasingly negative Z-score values with worsening osteoporosis. There were also inverse correlations between scoliosis and truncal muscle strength (r = - 0.595, p < 0.001). The correlation between scoliosis and age was notable up to 22 years (r = 0.421, p = 0.01), but not in the older age group (22-44 years). Our study identified inverse correlations between osteoporosis and scoliosis, as well as between scoliosis and truncal muscle strength, in FD patients. These findings suggest that there may be a relationship between bone density, muscle strength, and the severity of spinal curvature in this population. While our results highlight the potential importance of early diagnosis and management of osteoporosis, and possibly the benefits of physical therapy to strengthen truncal muscles, further research is needed to determine the direct impact of these interventions on preventing the progression of scoliosis and its associated complications in FD patients. A long-term longitudinal study could provide more insights into these relationships and inform treatment strategies for FD patients.
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Affiliation(s)
- I Yovchev
- Department of Rehabilitation, Hadassah Hebrew University Medical Center, Jerusalem, Israel
| | - Ch Maayan
- Department of Pediatrics, Hadassah Hebrew University Medical Center, Jerusalem, Israel
| | - N Simanovsky
- Department of Medical Imaging, Hadassah Hebrew University Medical Center, Jerusalem, Israel
| | - A J Foldes
- Osteoporosis Center, Hadassah Hebrew University Medical Center, Jerusalem, Israel
| | - R Brooks
- Department of Pediatrics, Hadassah Hebrew University Medical Center, Jerusalem, Israel
| | - L Kaplan
- Osteoporosis Center, Hadassah Hebrew University Medical Center, Jerusalem, Israel
| | - Z Meiner
- Department of Rehabilitation, Hadassah Hebrew University Medical Center, Jerusalem, Israel
| | - D Cheishvili
- Department of Pediatrics, Hadassah Hebrew University Medical Center, Jerusalem, Israel.
- Gerald Bronfman Department of Oncology, McGill University, Montréal, QC, Canada.
- HKG Epitherapeutics, Unit 313-315, 3/F Biotech Center 2, 11 Science Park West Avenue, Shatin, Hong Kong.
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Brooks R, Weiss S, Steigelman D. EFFECT OF OMALIZUMAB ON VENOM SPECIFIC IGE AND VENOM SKIN TESTING. Ann Allergy Asthma Immunol 2022. [DOI: 10.1016/j.anai.2022.08.802] [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: 11/11/2022]
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3
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Brooks R, Coop C. M005 A CASE OF TRIMETHOPRIM-SULFAMETHOXAZOLE INDUCED ASEPTIC MENINGITIS MASQUERADING AS SEPTIC SHOCK. Ann Allergy Asthma Immunol 2021. [DOI: 10.1016/j.anai.2021.08.179] [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: 11/29/2022]
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Henson F, Lydon H, Birch M, Brooks R, McCaskie A. Using apheresis-derived cells to augment microdrilling in the treatment of chondral defects in an ovine model. J Orthop Res 2021; 39:1411-1422. [PMID: 33146412 PMCID: PMC7612025 DOI: 10.1002/jor.24889] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/06/2020] [Revised: 09/17/2020] [Accepted: 10/21/2020] [Indexed: 02/04/2023]
Abstract
The treatment of chondral defects using microdrilling often results in a mechanically weak fibrocartilagenous repair, rather than a more robust hyaline cartilage repair. Many different microfracture/microdrilling augmentation techniques have been described, including the use of cellular products to enhance healing. Autologous peripheral blood progenitor cells can be obtained via apheresis after administration of granulocyte colony-stimulating factor (G-CSF) and have been used successfully to augment microdrilling in clinical patients. The objective of this study was to use apheresis-derived mononuclear blood cells to augment microdrilling treatment of a cartilage defect in an ovine model to determine the effect on healing. Forty adult female sheep were used in this study and were divided into a control group (microdrilling alone) and a treatment group (microdrilling, hyaluronic acid, and apheretic product). Outcome measurements included weight-bearing on the operated limb, macroscopic scoring of the joint, histology, and immunohistochemistry. In addition, magnetic resonance imaging was used to attempt to identify SPION-labeled cells from the apheretic product in the operated limbs. The results showed a significant increase in healing as measured by the modified O'Driscoll sore in the treated group. No evidence of homing of SPION-labeled cells to the defect was found and no correlation was found between the response to G-CSF administration or concentration of CD34+ and outcome. A correlation was found between healing and the concentration of white blood cells and peripheral blood mononuclear cell numbers in the apheretic product.
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Affiliation(s)
- Frances Henson
- Division of Trauma and Orthopaedic Surgery, Department of Surgery, Addenbrooke's Hospital, University of Cambridge, Cambridge, UK
| | - Helen Lydon
- Division of Trauma and Orthopaedic Surgery, Department of Surgery, Addenbrooke's Hospital, University of Cambridge, Cambridge, UK
| | - Mark Birch
- Division of Trauma and Orthopaedic Surgery, Department of Surgery, Addenbrooke's Hospital, University of Cambridge, Cambridge, UK
| | - Roger Brooks
- Division of Trauma and Orthopaedic Surgery, Department of Surgery, Addenbrooke's Hospital, University of Cambridge, Cambridge, UK
| | - Andrew McCaskie
- Division of Trauma and Orthopaedic Surgery, Department of Surgery, Addenbrooke's Hospital, University of Cambridge, Cambridge, UK
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Knight MT, Newman MC, Benzinger MJ, Agin JR, Ash M, Sims P, Hughes D, Arling V, Brock G, Bronstein A, Brooks R, Bucknavage M, Cirigliano M, Coles C, Farber J, Fisher B, George N, Heisick J, lannucci M, Koeritzer B, Lovett S, Mays J, McNally S, Menning C, Nelson T, Neufang K, Neuman S, O’Brien J, Rude R, Rudowski J, Singleton E, Sirivicha S, Turner S, VanderMeer J, Warburton D, Young S. TECRA Listeria Visual Immunoassay (TLVIA) for Detection of Listeria in Foods: Collaborative Study. J AOAC Int 2020. [DOI: 10.1093/jaoac/79.5.1083] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Abstract
Abstract
A collaborative study involving 26 laboratories and 5 food types was performed to compare the TECRA Listeria Visual Immunoassay (TLVIA) with standard culture methods. Three foods (lettuce, ice cream, and fish fillets), under the jurisdiction of the U.S. Food and Drug Administration, and 2 foods (cooked chicken and cooked ground turkey), under the jurisdiction of the U.S. Department of Agriculture, were used to determine the effectiveness of the TLVIA. Of the 900 samples tested, 300 were inoculated with low levels (1-5 cells/25 g) of Listeria spp. and 300 were inoculated with high levels of Listeria spp. (10-50 cells/25 g). Method agreement between the conventional culture methods and TLVIA (visual) was 94.7%. Method agreement between the conventional culture methods and TLVIA (reader) was 93.6%. The colorimetric polyclonal enzyme immunoassay (TLVIA) for detection of Listeria in foods has been adopted first action by AOAC INTERNATIONAL.
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Affiliation(s)
| | | | | | - James R Agin
- Q Laboratories, Inc., 2014 Harrison Ave, Cincinnati, OH 45214
| | - Megan Ash
- Bioenterprises Pty Ltd, 28 Barcoo St, Roseville, NSW, Australia 2069
| | - Paul Sims
- Bioenterprises Pty Ltd, 28 Barcoo St, Roseville, NSW, Australia 2069
| | - Denise Hughes
- Bioenterprises Pty Ltd, 28 Barcoo St, Roseville, NSW, Australia 2069
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Pearson RA, Brooks R, Driver S, Frew JA, Pedley ID, Pilling K, Richmond N, Walker C, West S, Wilkinson M, Wyatt J, McCallum H. Magnetic Resonance-only Workflow: Implementation in a UK Centre. Clin Oncol (R Coll Radiol) 2019; 32:278. [PMID: 31786082 DOI: 10.1016/j.clon.2019.10.009] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/16/2019] [Accepted: 10/24/2019] [Indexed: 01/06/2023]
Affiliation(s)
- R A Pearson
- Northern Centre for Cancer Care, The Newcastle Upon Tyne Hospitals NHS Foundation Trust, Newcastle upon Tyne, UK; Newcastle University Centre for Cancer, Newcastle upon Tyne, UK
| | - R Brooks
- Northern Centre for Cancer Care, The Newcastle Upon Tyne Hospitals NHS Foundation Trust, Newcastle upon Tyne, UK
| | - S Driver
- Northern Centre for Cancer Care, The Newcastle Upon Tyne Hospitals NHS Foundation Trust, Newcastle upon Tyne, UK
| | - J A Frew
- Northern Centre for Cancer Care, The Newcastle Upon Tyne Hospitals NHS Foundation Trust, Newcastle upon Tyne, UK
| | - I D Pedley
- Northern Centre for Cancer Care, The Newcastle Upon Tyne Hospitals NHS Foundation Trust, Newcastle upon Tyne, UK
| | - K Pilling
- Northern Centre for Cancer Care, The Newcastle Upon Tyne Hospitals NHS Foundation Trust, Newcastle upon Tyne, UK
| | - N Richmond
- Northern Centre for Cancer Care, The Newcastle Upon Tyne Hospitals NHS Foundation Trust, Newcastle upon Tyne, UK
| | - C Walker
- Northern Centre for Cancer Care, The Newcastle Upon Tyne Hospitals NHS Foundation Trust, Newcastle upon Tyne, UK
| | - S West
- Northern Centre for Cancer Care, The Newcastle Upon Tyne Hospitals NHS Foundation Trust, Newcastle upon Tyne, UK
| | - M Wilkinson
- Northern Centre for Cancer Care, The Newcastle Upon Tyne Hospitals NHS Foundation Trust, Newcastle upon Tyne, UK
| | - J Wyatt
- Northern Centre for Cancer Care, The Newcastle Upon Tyne Hospitals NHS Foundation Trust, Newcastle upon Tyne, UK; Newcastle University Centre for Cancer, Newcastle upon Tyne, UK
| | - H McCallum
- Northern Centre for Cancer Care, The Newcastle Upon Tyne Hospitals NHS Foundation Trust, Newcastle upon Tyne, UK; Newcastle University Centre for Cancer, Newcastle upon Tyne, UK
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Silbernagel K, Jechorek R, Carver C, Barbour WM, Mrozinski P, Albert A, Andaloro B, Anderson G, Beacorn F, Brooks R, Carson M, Crossfield D, Eliasberg S, Farmer D, Frantzeskakis C, Gasses T, Gatesy T, Hall G, Hanson P, Heddaeus K, Hermann K, Hutchins J, Jenkins J, Johnson F, Johnson J, Kawalek M, Kelly L, Koschmann C, Lannon P, Lester D, Manner K, Martin J, Maselli M, McGovern B, Mohnke F, Moon B, Murray L, Pace R, Richards J, Robeson S, Rodgers D, Rosario G, Saunders C, Shaw C, Dana Shell J, Sloan E, Thompson S, Vialpando M, Voermans R, Watts K, Wieczorek K, Wilson K, Yeh H, Zamora D. Evaluation of the BAX® System for Detection of Salmonella in Selected Foods: Collaborative Study. J AOAC Int 2019. [DOI: 10.1093/jaoac/86.6.1149] [Citation(s) in RCA: 16] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Abstract
Abstract
A multilaboratory study was conducted to compare the automated BAX® System to the standard cultural methods for detection of Salmonella in selected foods. Five food types—frankfurters, raw ground beef, mozzarella cheese, raw frozen tilapia fish, and orange juice—at 3 inoculation levels, were analyzed by each method. A sixth food type, raw ground chicken, was tested using 3 naturally contaminated lots. A total of 16 laboratories representing government and industry participated. In this study, 1386 samples were analyzed, of which 1188 were paired samples and 198 were unpaired samples. Of the 1188 paired samples, 461 were positive by both methods and 404 were negative by both methods. Thirty-seven samples were positive by the BAX System but negative by the standard reference method, and 11 samples were positive by standard cultural method and negative by the BAX System. Of the 198 unpaired samples, 106 were positive by the BAX System and 60 were positive by the standard cultural method. A Chi square analysis of each of the 6 food types, at the 3 inoculation levels tested, was performed. For all foods, the BAX System demonstrated results comparable to those of the standard reference methods based on the Chi square results.
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Affiliation(s)
| | | | - Charles Carver
- rtech laboratories, PO Box 64101, St. Paul, MN 55164-0101
| | - W Mark Barbour
- DuPont Qualicon, 3531 Silverside Rd, Bedford Building, Wilmington, DE 19810
| | - Peter Mrozinski
- DuPont Qualicon, 3531 Silverside Rd, Bedford Building, Wilmington, DE 19810
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Hughes D, Dailianis AE, Hill L, Curiale MS, Gangar V, Arnold D, Barrat C, Baxter T, Bell J, Brooks R, Bryant D, Burke K, Burnie A, Cliffard D, Danisavich T, Daniels K, Deiss K, D’Onorio A, Faucher K, Finkenbiner D, Gasanov U, Gebler J, Gerry A, Graham D, Graham T, Harris P, Hetrick S, Jurgens J, Keating KJ, Klokman R, Le C, Matrozza M, McCarthy R, McCawley C, Munyard S, Pye V, Rajkowski K, Ristov K, Rosinko J, Schneider K, Schubert MJ, Sloan E, Souter, Wilson M, Zuroski K. Salmonella in Foods: New Enrichment Procedure for TECRA Salmonella Visual Immunoassay Using a Single RV(R10) Only, TT Only, or Dual RV(R10) and TT Selective Enrichment Broths (AOAC Official Method 998.09): Collaborative Study. J AOAC Int 2019. [DOI: 10.1093/jaoac/86.4.775] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Abstract
Abstract
A collaborative study was conducted to compare a new enrichment procedure for the TECRA® Salmonella Visual Immunoassay (TSVIA) with the reference method given in the U.S. Food and Drug Administration's Bacteriological Analytical Manual (7th Ed.). Three food types (milk powder, pepper, and soy flour) were analyzed in Australia and 3 food types (milk chocolate, dried egg, and raw turkey) were analyzed in the United States. Thirty-eight collaborators participated in the study. The TECRA method was evaluated using both Rappaport-Vassiliadis R10 (RV(R10)) and tetrathionate (TT) broths for selective enrichment. M broth cultures arising from each of the 2 selective enrichment broths were tested in the TSVIA using 2 individual wells, one for each selective broth, and a single well to test the pooled selective enrichment broths. The results for the pooled enrichment broths were reported elsewhere. This study presents the results for the use of single enrichment broths, i.e., RV(R10) only or TT only, with the TSVIA. No significant differences (p > 0.05) were observed for the pairwise comparison of the proportion of positive samples for either RV(R10) or TT used as a single enrichment broth for the TSVIA with that for the reference method.
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Affiliation(s)
- Denise Hughes
- TECRA International, 13 Rodborough Rd, Frenchs Forest, NSW 2086, Australia
| | - Angela E Dailianis
- TECRA International, 13 Rodborough Rd, Frenchs Forest, NSW 2086, Australia
| | - Louise Hill
- TECRA International, 13 Rodborough Rd, Frenchs Forest, NSW 2086, Australia
| | - Michael S Curiale
- Silliker Laboratories Group, Research Services, Halsted St, Chicago Heights, IL 60430
| | - Vidhya Gangar
- Silliker Laboratories Group, Research Services, Halsted St, Chicago Heights, IL 60430
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9
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Hughes D, Dailianis A, Duncan L, Briggs J, McKintyre DA, Silbernagel K, Anderson G, Anderson J, Bannach B, Barratt C, Booyens C, Briggs J, Brooks R, Bryant D, Burnie A, Carver C, Chambers D, Chong J, Clarke D, Coates E, Comontofski G, Deiss K, Destro C, Dillon J, Duncan L, Dundas M, Dymond N, Dziedziczak D, Eglezos S, Gasanov U, Gebler J, Graham T, Haley E, Johnson L, Kurien S, Maczuga J, Matera J, Matthew K, Munyard S, Ramine A, Reed J, Remes A, Subasinghe N, Tan A, Tan J, Tatum M, Taylor M, Torrance H, Twohy C, Vialpando M, Watts K. Modification of Enrichment Protocols for TECRA Listeria Visual Immunoassay Method 995.22: Collaborative Study. J AOAC Int 2019. [DOI: 10.1093/jaoac/86.2.340] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022]
Abstract
Abstract
A collaborative study was conducted to validate new enrichment methods for the TECRA Listeria Visual Immunoassay (TLVIA). These new methods incorporate a newly formulated medium, TECRA Listeria Enrichment Broth, which does not contain the highly toxic antifungal agent, cycloheximide. The new procedures will provide an alternative to the enrichment procedures described in AOAC Method 995.22. Three food types (raw ground beef, lettuce, and ice cream) were analyzed in the United States, and 2 food types (cooked turkey and cooked fish fillets) were analyzed in Australasia. Thirty collaborators participated in the study, 16 in Australasia and 14 in the United States. With the exception of one batch of ground beef, comparison of the proportion of positive test portions (p ≥ 0.05) showed no significant difference between the TLVIA and the reference method for the 5 foods at 3 inoculation levels. For the one batch of naturally contaminated raw ground beef, the TLVIA gave significantly more confirmed positive results than the reference method.
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Affiliation(s)
- Denise Hughes
- TECRA International, 13 Rodborough Rd, French’s Forest, NSW 2086, Australia
| | - Angela Dailianis
- TECRA International, 13 Rodborough Rd, French’s Forest, NSW 2086, Australia
| | - Louise Duncan
- TECRA International, 13 Rodborough Rd, French’s Forest, NSW 2086, Australia
| | - Julie Briggs
- TECRA International, 13 Rodborough Rd, French’s Forest, NSW 2086, Australia
| | | | - Karen Silbernagel
- rtech laboratories, Lexington Ave, N. Arden Hills, Minneapolis, MN 55126
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10
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Hughes D, Dailianis AE, Hill L, McIntyre DA, Anderson A, Anderson A, Barrat C, Battista K, Beatty S, Blanch T, Briones D, Brooks R, Brown J, Burnie A, Clark T, Dailianis A, Destro C, Dijs B, Dombroski P, Fyfe R, Gebler J, Gerry A, Graham T, Hadjimichael D, Heaton S, Hetrick S, High E, Hill L, Hirt B, Hulett B, Hussain Z, Kalinowski R, Kerr D, Matouchi N, Maycock L, Munyard S, Murphy M, Remes A, Ristov K, Robbins R, Rodriquez R, Shebuski J, Simes V, Smith K, Vanderpoel S, Wang D. TECRA® Unique™ Test for Rapid Detection of Salmonella in Food: Collaborative Study. J AOAC Int 2019. [DOI: 10.1093/jaoac/84.2.416] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Abstract
Abstract
The TECRA® Unique™ Salmonella test uses the principle of immunoenrichment to allow rapid detection of Salmonellae in food. A collaborative study was conducted to compare the TECRA Salmonella Unique test with the reference culture method given in the U.S. Food and Drug Administration's Bacteriological Analytical Manual. Three food types (milk powder, pepper, and soy flour) were analyzed in Australia and 2 food types (milk chocolate and dried egg) were analyzed in the United States. Forty-one collaborators participated in the study. For each of the 5 foods at each of the 3 levels, a comparison showed no significant differences (p ≥ 0.05) in the proportion of positive test samples for Unique and that for the reference method using the Chi-square test for independence with continuity correction.
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Affiliation(s)
- Denise Hughes
- TECRA International, 13 Rodborough Rd, French's Forest, NSW 2086, Australia
| | - Angela E Dailianis
- TECRA International, 13 Rodborough Rd, French's Forest, NSW 2086, Australia
| | - Louise Hill
- TECRA International, 13 Rodborough Rd, French's Forest, NSW 2086, Australia
| | - Deborah A McIntyre
- R-TECH Laboratories, Lexington Ave, N. Arden Hills, Minneapolis, MN 55126
| | - Aimee Anderson
- R-TECH Laboratories, Lexington Ave, N. Arden Hills, Minneapolis, MN 55126
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Finkelstein A, Bachner YG, Greenberger C, Brooks R, Tenenbaum A. Correlates of burnout among professionals working with people with intellectual and developmental disabilities. J Intellect Disabil Res 2018; 62:864-874. [PMID: 30141530 DOI: 10.1111/jir.12542] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [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: 07/24/2017] [Revised: 04/27/2018] [Accepted: 07/19/2018] [Indexed: 06/08/2023]
Abstract
BACKGROUND Although burnout has been recognised as an important stress-related problem among staff working with people with intellectual and developmental disabilities (IDD), literature on the subject is limited yet emerging. The aim of this study is twofold: (1) to evaluate the level of burnout within different professions working with IDD; (2) to examine the association between socio-demographic, professional and organisational characteristics and burnout. METHOD One hundred ninety-nine professionals working with people with IDD were enrolled in the study (66% response rate). Participants were recruited from several facilities that provide care for people with IDD of all ages, in the Jerusalem area and in other cities in central Israel. The anonymous questionnaires included valid and reliable measures of burnout, socio-demographic variables, professional variables and organisational variables. RESULTS Participants' mean age was 38.3 years, and most were women. There were no significant differences in burnout levels among the different professionals. Role ambiguity, perceived overload, care-recipient group and job involvement were significant predictors of burnout. The model explained a high percentage (46.8%) of the observed variance. CONCLUSIONS Most of these predictors are organisational measures. These findings demonstrate that organisational variables are more significantly associated with burnout of staff working with people with IDD than the socio-demographic factors or professional characteristics. Identifying and better understanding the specific factors associated with burnout among professionals working with IDD could facilitate unique intervention programs to reduce burnout levels in staff.
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Affiliation(s)
- A Finkelstein
- Department of Nursing, Faculty of Life and Health Sciences, Jerusalem College of Technology, Jerusalem, Israel
| | - Y G Bachner
- Department of Public Health, Faculty of Health Sciences, Ben Gurion University of the Negev, Beer Sheva, Israel
| | - C Greenberger
- Department of Nursing, Faculty of Life and Health Sciences, Jerusalem College of Technology, Jerusalem, Israel
| | - R Brooks
- Department of Pediatrics, Hadassah Medical Center Mt. Scopus, Jerusalem, Israel
| | - A Tenenbaum
- Department of Pediatrics, Hadassah Medical Center Mt. Scopus, Jerusalem, Israel
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12
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Lydon H, Brooks R, McCaskie A, Henson F. Peripheral mononuclear blood cell apheresis in a preclinical ovine model. BMC Vet Res 2018; 14:47. [PMID: 29439735 PMCID: PMC5812194 DOI: 10.1186/s12917-018-1332-4] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/04/2017] [Accepted: 01/03/2018] [Indexed: 12/26/2022] Open
Abstract
Background Recent research has demonstrated that circulating peripheral blood mononuclear fractions (PBMC) containing haematopoietic stem (HSC)/progenitor cells have the potential to play a crucial role in regenerative medicine strategies. Work in our laboratory has shown that a peripheral blood mononuclear cell fraction (PBMC) enhances cartilage repair in an osteochondral defect model in sheep and has a significant effect on cells in the joint niche. In order to obtain PBMC rich blood containing HSCs for further studies, we have performed, for the first time, apheresis on adult sheep. Results Subcutaneous granulocyte-colony stimulating factor (G-CSF) was used to mobilise white blood cells and continual flow apheresis was performed on 8 sheep under general anaesthetic. There were no observable side effects, although a marked tendency for blood clotting during the procedure was noted. The administration of G-CSF for 3 days increased the white blood cell (WBC) count in the peripheral blood from to 6.7 ± 2.1 × 106/ml to 16.1 ± 5.0 × 106/ml. Following apheresis, the WBC numbers in the apheretic product increased to 38.5 ± 27.6 × 106/ml, comprised of a significant increase in neutrophils and PBMC (from 5.25 ± 1.8 × 106/ml following G-CSF stimulation to 27.5 5 ± 27.6 × 106/ml). There was a mean of 2.1% CD34 + ve cells and 95.5% CD45 + ve cells in the apheretic product. Conclusions This study describes the administration of G-CSF and subsequent apheresis in adult sheep. The technique is safe when performed as described with no observable side effects. The technique permits collection of an increased WBC fraction containing neutrophils and PBMC in adult sheep. This apheretic product contains CD34 + ve cells, representing an HSC/progenitor population for use in in vivo and in vitro experiments.
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Affiliation(s)
- Helen Lydon
- Department of Surgery, University of Cambridge, Hill's Road, Cambridge, UK
| | - Roger Brooks
- Department of Surgery, University of Cambridge, Hill's Road, Cambridge, UK
| | - Andrew McCaskie
- Department of Surgery, University of Cambridge, Hill's Road, Cambridge, UK
| | - Frances Henson
- Department of Surgery, University of Cambridge, Hill's Road, Cambridge, UK. .,Department of Veterinary Medicine, University of Cambridge, Madingley Road, Cambridge, UK.
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Chen SC, Brooks R, Houskeeper J, Bremner SK, Dunlop J, Viollet B, Logan PJ, Salt IP, Ahmed SF, Yarwood SJ. Corrigendum to "Metformin suppresses adipogenesis through both AMP-activated protein kinase (AMPK)-dependent and AMPK-independent mechanisms" [Mol. Cell. Endocrinol. 440 15 January 2017 57-68]. Mol Cell Endocrinol 2017; 443:176. [PMID: 28183460 PMCID: PMC6854454 DOI: 10.1016/j.mce.2017.01.049] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Affiliation(s)
- S C Chen
- The Developmental Endocrinology Research Group, School of Medicine, University of Glasgow, Glasgow G51 4TF, UK; CNRS, UMR8104, Paris, France
| | - R Brooks
- The Developmental Endocrinology Research Group, School of Medicine, University of Glasgow, Glasgow G51 4TF, UK
| | - J Houskeeper
- Institute of Molecular, Cell and Systems Biology, University Avenue, University of Glasgow, Glasgow G12 8QQ, UK
| | - S K Bremner
- Institute of Molecular, Cell and Systems Biology, University Avenue, University of Glasgow, Glasgow G12 8QQ, UK
| | - J Dunlop
- Institute of Molecular, Cell and Systems Biology, University Avenue, University of Glasgow, Glasgow G12 8QQ, UK
| | - B Viollet
- INSERM, U1016, Institut Cochin, Paris, France; CNRS, UMR8104, Paris, France; Université Paris Descartes, Sorbonne Paris Cité, France
| | - P J Logan
- Institute of Cardiovascular and Medical Sciences, University Avenue, University of Glasgow, Glasgow G12 8QQ, UK
| | - I P Salt
- Institute of Cardiovascular and Medical Sciences, University Avenue, University of Glasgow, Glasgow G12 8QQ, UK
| | - S F Ahmed
- The Developmental Endocrinology Research Group, School of Medicine, University of Glasgow, Glasgow G51 4TF, UK
| | - S J Yarwood
- Institute of Biological Chemistry, Biophysics and Bioengineering, Edinburgh Campus, Heriot-Watt University, Edinburgh EH14 4AS, UK.
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McAnuff J, Brooks R, Duff C, Quinn M, Marshall J, Kolehmainen N. Improving participation outcomes and interventions in neurodisability: co-designing future research. Child Care Health Dev 2017; 43:298-306. [PMID: 27766678 DOI: 10.1111/cch.12414] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/31/2016] [Accepted: 09/04/2016] [Indexed: 11/30/2022]
Abstract
There is an urgent, agreed need to improve participation outcomes and interventions for children and young people with neurodisability. We worked together with service users and providers to design research into participation outcomes and interventions in neurodisability. We built on existing evidence about participation outcomes and interventions and the WHO International Classification of Functioning, Disability and Health. We: (1) specified seven participation outcome categories for measurement; (2) prioritized these for improvement: self-care, friends and social, and physical activity ranked the highest; (3) identified 11 potential intervention categories for targeting the top priority, self-care, through eight hypothesized change mechanisms and agreed for the interventions to be delivered as a 'Menu of Interventions' for personalized self-care support; and (4) designed a before-and-after mixed methods feasibility study to evaluate the Menu with children and young people (0-12 years) and their parents and therapists.
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Affiliation(s)
- J McAnuff
- Institite of Health and Society, Newcastle University, Newcastle upon Tyne, UK.,Leeds Community Healthcare NHS Trust, Leeds, UK
| | - R Brooks
- Leeds Beckett University, Leeds, UK
| | - C Duff
- Leeds Community Healthcare NHS Trust, Leeds, UK
| | - M Quinn
- Northumberland, Tyne and Wear NHS Foundation Trust, Newcastle upon Tyne, UK
| | - J Marshall
- Newcastle upon Tyne Hospitals NHS Foundation Trust, Newcastle upon Tyne, UK
| | - N Kolehmainen
- Institite of Health and Society, Newcastle University, Newcastle upon Tyne, UK.,Newcastle upon Tyne Hospitals NHS Foundation Trust, Newcastle upon Tyne, UK
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Itkin T, Kumari A, Schneider E, Gur-Cohen S, Ludwig C, Brooks R, Kollet O, Golan K, Khatib-Massalha E, Russo CM, Chisholm JD, Rouhi A, Geiger H, Hornstein E, Kerr WG, Kuchenbauer F, Lapidot T. MicroRNA-155 promotes G-CSF-induced mobilization of murine hematopoietic stem and progenitor cells via propagation of CXCL12 signaling. Leukemia 2017; 31:1247-1250. [PMID: 28174416 DOI: 10.1038/leu.2017.50] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Affiliation(s)
- T Itkin
- Department of Immunology, Weizmann Institute of Science, Rehovot, Israel.,Department of Medicine, Ansary Stem Cell Institute, Weill Cornell Medicine, New York, NY, USA
| | - A Kumari
- Department of Immunology, Weizmann Institute of Science, Rehovot, Israel
| | - E Schneider
- Department of Internal Medicine III, Ulm University, Ulm, Germany
| | - S Gur-Cohen
- Department of Immunology, Weizmann Institute of Science, Rehovot, Israel
| | - C Ludwig
- Department of Internal Medicine III, Ulm University, Ulm, Germany
| | - R Brooks
- Department of Microbiology and Immunology, SUNY Upstate Medical University, Syracuse, NY, USA
| | - O Kollet
- Department of Immunology, Weizmann Institute of Science, Rehovot, Israel
| | - K Golan
- Department of Immunology, Weizmann Institute of Science, Rehovot, Israel
| | - E Khatib-Massalha
- Department of Immunology, Weizmann Institute of Science, Rehovot, Israel
| | - C M Russo
- Department of Chemistry, Syracuse University, Syracuse, NY, USA
| | - J D Chisholm
- Department of Chemistry, Syracuse University, Syracuse, NY, USA
| | - A Rouhi
- Department of Internal Medicine III, Ulm University, Ulm, Germany
| | - H Geiger
- Department of Dermatology and Allergic Diseases, Institute for Molecular Medicine and Aging Research Center, University of Ulm, Ulm, Germany
| | - E Hornstein
- Department of Molecular Genetics, Weizmann Institute of Science, Rehovot, Israel
| | - W G Kerr
- Department of Microbiology and Immunology, SUNY Upstate Medical University, Syracuse, NY, USA.,Department of Chemistry, Syracuse University, Syracuse, NY, USA.,Department of Pediatrics, SUNY Upstate Medical University, Syracuse, NY, USA
| | - F Kuchenbauer
- Department of Internal Medicine III, Ulm University, Ulm, Germany
| | - T Lapidot
- Department of Immunology, Weizmann Institute of Science, Rehovot, Israel
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Affiliation(s)
| | - R.A. Yeary
- School of Aviation Medicine, Brooks AFB, Texas
| | - R. Brooks
- School of Aviation Medicine, Brooks AFB, Texas
| | - N.O. Harris
- School of Aviation Medicine, Brooks AFB, Texas
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Shamriz O, Wolf DG, Bennett-Back O, Brooks R, Kleid DM, Hashavya S. Letters. Isr Med Assoc J 2016; 18:506. [PMID: 28471592] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Affiliation(s)
- O Shamriz
- Department of Pediatrics, Hadassah-Hebrew University Medical Center, Ein Kerem, Jerusalem, Israel
| | - D G Wolf
- Department of Clinical Virology Unit, Department of Clinical Microbiology
- Infectious Diseases, Hadassah-Hebrew University Medical Center, Ein Kerem, Jerusalem, Israel
| | - O Bennett-Back
- Pediatric Neurology Unit, Shaare Zedek Medical Center, Jerusalem, Israel
| | - R Brooks
- Department of Pediatrics, Hadassah-Hebrew University Medical Center, Mount Scopus, Jerusalem, Israel
| | - D M Kleid
- Pediatric Intensive Care Unit, Hadassah-Hebrew University Medical Center, Ein Kerem, Jerusalem, Israel
| | - S Hashavya
- Department of Pediatric Emergency, Hadassah-Hebrew University Medical Center, Ein Kerem, Jerusalem, Israel
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Sharp P, Barber DC, Brown DG, Burgess AE, Metz CE, Myers KJ, Taylor CJ, Wagner RF, Brooks R, Hill CR, Kuhl DE, Smith MA, Wells P, Worthington B. 4. Quality of the Observed Image. ACTA ACUST UNITED AC 2016. [DOI: 10.1093/jicru/os28.1.23] [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: 11/13/2022]
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Sharp P, Barber DC, Brown DG, Burgess AE, Metz CE, Myers KJ, Taylor CJ, Wagner RF, Brooks R, Hill CR, Kuhl DE, Smith MA, Wells P, Worthington B. Report 54. ACTA ACUST UNITED AC 2016. [DOI: 10.1093/jicru/os28.1.report54] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
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20
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Rochon P, Brooks R, Lind K, Durham J, Forman L, Gipson M, Trivedi P, Smith M, Kondo K, Johnson D, Ghatan C, Rajebi M, Ryu R. Survival benefit of Budd-Chiari patients who undergo TIPS as a bridge to transplant: a single center experience. J Vasc Interv Radiol 2016. [DOI: 10.1016/j.jvir.2015.12.503] [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: 10/22/2022] Open
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Brooks R, Iyer S, Akada H, Neelam S, Russo CM, Chisholm JD, Kerr WG. Coordinate expansion of murine hematopoietic and mesenchymal stem cell compartments by SHIPi. Stem Cells 2015; 33:848-58. [PMID: 25402778 DOI: 10.1002/stem.1902] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.4] [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: 07/21/2014] [Revised: 09/22/2014] [Accepted: 10/27/2014] [Indexed: 11/07/2022]
Abstract
Promoting the expansion of adult stem cell populations offers the potential to ameliorate radiation or chemotherapy-induced bone marrow failure and allows for expedited recovery for patients undergoing these therapies. Previous genetic studies suggested a pivotal role for SH2 domain-containing inositol-5-phosphatase 1 (SHIP1) in limiting the size of the hematopoietic stem cell (HSC) compartment. The aim of this study was to determine whether our recent development of small molecule SHIP1 inhibitors offers the potential for pharmacological expansion of the HSC compartment in vivo. We show here that treatment of mice with aminosteroid inhibitors of SHIP1 (SHIPi) more than doubles the size of the adult mesenchymal stem cell (MSC) compartment while simultaneously expanding the HSC pool sixfold. Consistent with its ability to target SHIP1 function in vivo, SHIPi also significantly increases plasma granulocyte colony-stimulating factor (G-CSF) levels, a growth factor that supports proliferation of HSC. Here, we show that SHIPi-induced G-CSF production mediates HSC and MSC expansion, as in vivo neutralization of G-CSF abrogates the SHIPi-induced expansion of both the HSC and MSC compartments. Due to its expansionary effect on adult stem cell compartments, SHIPi represents a potential novel strategy to improve declining stem cell function in both therapy induced and genetically derived bone marrow failure syndromes.
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Affiliation(s)
- R Brooks
- Department of Microbiology & Immunology, SUNY Upstate Medical University, Syracuse, New York, USA
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Chapman J, Roddy E, Chen L, Westhoff G, Brooks R, Ueda S, Chen L. An enhanced recovery pathway decreases length of hospital stay in gynecologic oncology patients undergoing minimally invasive surgery. Gynecol Oncol 2015. [DOI: 10.1016/j.ygyno.2015.07.039] [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: 11/29/2022]
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Hopper N, Henson F, Brooks R, Ali E, Rushton N, Wardale J. Peripheral blood derived mononuclear cells enhance osteoarthritic human chondrocyte migration. Arthritis Res Ther 2015; 17:199. [PMID: 26249339 PMCID: PMC4528856 DOI: 10.1186/s13075-015-0709-z] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.4] [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: 01/27/2015] [Accepted: 07/07/2015] [Indexed: 12/18/2022] Open
Abstract
Introduction A major problem in cartilage repair is the lack of chondrogenic cells migrating from healthy tissue into defects. Cartilage is essentially avascular and therefore its healing is not considered to involve mononuclear cells. Peripheral blood derived mononuclear cells (PBMC) offer a readily available autologous cell source for clinical use and therefore this study was designed to evaluate the effects of PBMCs on chondrocytes and cartilage. Methods Human primary chondrocytes and cartilage tissue explants were taken from patients undergoing total knee replacement (n = 17). Peripheral blood samples were obtained from healthy volunteers (n = 12) and mononuclear cells were isolated by density-gradient centrifugation. Cell migration and chemokinetic potential were measured using a scratch assay, xCELLigence and CyQuant assay. PCR array and quantitative PCR was used to evaluate mRNA expression of 87 cell motility and/or chondrogenic genes. Results The chondrocyte migration rate was 2.6 times higher at 3 hour time point (p < 0.0001) and total number of migrating chondrocytes was 9.7 times higher (p < 0.0001) after three day indirect PBMC stimulus and 8.2 times higher (p < 0.0001) after three day direct co-culture with PBMCs. A cartilage explant model confirmed that PBMCs also exert a chemokinetic role on ex vivo tissue. PBMC stimulation was found to significantly upregulate the mRNA levels of 2 chondrogenic genes; collagen type II (COL2A1 600–fold, p < 0.0001) and SRY box 9 (SOX9 30–fold, p < 0.0001) and the mRNA levels of 7 genes central in cell motility and migration were differentially regulated by 24h PBMC stimulation. Conclusion The results support the concept that PBMC treatment enhances chondrocyte migration without suppressing the chondrogenic phenotype possibly via mechanistic pathways involving MMP9 and IGF1. In the future, peripheral blood mononuclear cells could be used as an autologous point-ofcare treatment to attract native chondrocytes from the diseased tissue to aid in cartilage repair.
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Affiliation(s)
- Niina Hopper
- Division of Trauma and Orthopaedic Surgery, University of Cambridge, Addenbrooke's Hospital, Hills Road, BC2 0QQ, Cambridge, UK.
| | - Frances Henson
- Department of Veterinary Medicine, University of Cambridge, Madingley Road, CB3 0ES, Cambridge, UK.
| | - Roger Brooks
- Division of Trauma and Orthopaedic Surgery, University of Cambridge, Addenbrooke's Hospital, Hills Road, BC2 0QQ, Cambridge, UK.
| | - Erden Ali
- Division of Trauma and Orthopaedic Surgery, University of Cambridge, Addenbrooke's Hospital, Hills Road, BC2 0QQ, Cambridge, UK.
| | - Neil Rushton
- Division of Trauma and Orthopaedic Surgery, University of Cambridge, Addenbrooke's Hospital, Hills Road, BC2 0QQ, Cambridge, UK.
| | - John Wardale
- Division of Trauma and Orthopaedic Surgery, University of Cambridge, Addenbrooke's Hospital, Hills Road, BC2 0QQ, Cambridge, UK.
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Hopper N, Wardale J, Brooks R, Power J, Rushton N, Henson F. Peripheral Blood Mononuclear Cells Enhance Cartilage Repair in in vivo Osteochondral Defect Model. PLoS One 2015; 10:e0133937. [PMID: 26252391 PMCID: PMC4529143 DOI: 10.1371/journal.pone.0133937] [Citation(s) in RCA: 51] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/21/2015] [Accepted: 07/02/2015] [Indexed: 02/07/2023] Open
Abstract
This study characterized peripheral blood mononuclear cells (PBMC) in terms of their potential in cartilage repair and investigated their ability to improve the healing in a pre-clinical large animal model. Human PBMCs were isolated with gradient centrifugation and adherent PBMC’s were evaluated for their ability to differentiate into adipogenic, chondrogenic and osteogenic lineages and also for their expression of musculoskeletal genes. The phenotype of the PBMCs was evaluated using Stro-1, CD34, CD44, CD45, CD90, CD106, CD105, CD146 and CD166 cell surface markers. Osteochondral defects were created in the medial femoral condyle (MFC) of 24 Welsh mountain sheep and evaluated at a six month time point. Four cell treatment groups were evaluated in combination with collagen-GAG-scaffold: (1) MSC alone; (2) MSCs and PBMCs at a ratio of 20:1; (3) MSCs and PBMC at a ratio of 2:1 and (4) PBMCs alone. Samples from the surgical site were evaluated for mechanical properties, ICRS score and histological repair. Fresh PBMC samples were 90% positive for hematopoietic cell surface markers and negative for the MSC antibody panel (<1%, p = 0.006). However, the adherent PBMC population expressed mesenchymal stem cell markers in hypoxic culture and lacked CD34/45 positive cells (<0.2%). This finding demonstrated that the adherent cells had acquired an MSC-like phenotype and transformed in hypoxia from their original hematopoietic lineage. Four key genes in muskuloskeletal biology were significantly upregulated in adherent PBMCs by hypoxia: BMP2 4.2-fold (p = 0.0007), BMP6 10.7-fold (p = 0.0004), GDF5 2.0-fold (p = 0.002) and COL1 5.0-fold (p = 0.046). The monolayer multilineage analysis confirmed the trilineage mesenchymal potential of the adherent PBMCs. PBMC cell therapy was equally good as bone marrow MSC therapy for defects in the ovine large animal model. Our results show that PBMCs support cartilage healing and oxygen tension of the environment was found to have a key effect on the derivation of a novel adherent cell population with an MSC-like phenotype. This study presents a novel and easily attainable point-of-care cell therapy with PBMCs to treat osteochondral defects in the knee avoiding any cell manipulations outside the surgical room.
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Affiliation(s)
- Niina Hopper
- Division of Trauma and Orthopaedic Surgery, University of Cambridge, Addenbrooke's Hospital, Cambridge, BC2 0QQ, the United Kingdom
- * E-mail:
| | - John Wardale
- Division of Trauma and Orthopaedic Surgery, University of Cambridge, Addenbrooke's Hospital, Cambridge, BC2 0QQ, the United Kingdom
| | - Roger Brooks
- Division of Trauma and Orthopaedic Surgery, University of Cambridge, Addenbrooke's Hospital, Cambridge, BC2 0QQ, the United Kingdom
| | - Jonathan Power
- Department of Biological Sciences, University of Chester, Chester, CH1 4BJ, the United Kingdom
| | - Neil Rushton
- Division of Trauma and Orthopaedic Surgery, University of Cambridge, Addenbrooke's Hospital, Cambridge, BC2 0QQ, the United Kingdom
| | - Frances Henson
- Department of Veterinary Medicine, University of Cambridge, Cambridge, CB3 0ES, the United Kingdom
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Walker N, Leatherwood J, Brooks R, Smith C, TenBroeck S, Vernon K, Waite K, Volgesang M, Egan B, Berg E, Miller J. 165 National American Collegiate Horsemen's Association Convention: an effective equine educational venue. J Equine Vet Sci 2015. [DOI: 10.1016/j.jevs.2015.03.178] [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: 11/30/2022]
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Chase TN, Foster NL, Fedio P, Mansi L, Brooks R, Kessler R, Di Chiro G. Cognitive and cerebral metabolic function in early and advanced Alzheimer's disease. Monogr Neural Sci 2015; 11:176-9. [PMID: 6610824 DOI: 10.1159/000409208] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/21/2023]
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Getgood A, Henson F, Skelton C, Brooks R, Guehring H, Fortier LA, Rushton N. Osteochondral tissue engineering using a biphasic collagen/GAG scaffold containing rhFGF18 or BMP-7 in an ovine model. J Exp Orthop 2014; 1:13. [PMID: 26914758 PMCID: PMC4545804 DOI: 10.1186/s40634-014-0013-x] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/25/2014] [Accepted: 08/20/2014] [Indexed: 01/23/2023] Open
Abstract
BACKGROUND The aim of this study was to investigate the effect of combining rhFGF18 or BMP-7 with a biphasic collagen/GAG osteochondral scaffold (Chondromimetic) on the repair of osteochondral defects in sheep. METHODS Osteochondral defects (5.8x6mm) were created in the medial femoral condyle (MFC) and the lateral trochlea sulcus (LTS) of the stifle joint of 24 female sheep. Sheep were randomly assigned to four groups (n = 6); 1) empty defect, 2) scaffold only, 3) scaffold + rhFGF-18 (30 μg) and 4) scaffold + BMP-7 (100 μg). At 6 months the defects underwent non-destructive mechanical testing, gross assessment of repair tissue (ICRS score) and histological analysis (Modified O'Driscoll score). RESULTS ICRS repair score: Defects treated with scaffold + rhFGF18 (mean 9.83, 95% CI 8.43-11.23) and scaffold + BMP-7 (10, 9.06-10.94) in the MFC had significantly improved ICRS scores compared to empty defects (4.2, 0-8.80) (p = 0.002). Mechanical properties: BMP-7 treated defects (mean 64.35, 95% CI 56.88-71.82) were significantly less stiff than both the rhFGF18 (mean 84.1, 95% CI 76.8-91.4) and empty defects in the LTS, compared to both contralateral limb (p = 0.003), and the perilesional articular cartilage (p < 0.001). HISTOLOGY A statistically significant improvement in the modified O'Driscoll score was observed in the rhFGF18 treated group (mean 16.83, 95% CI 13.65-20.61) compared to the empty defects (mean 9, 95% CI 4.88-13.12) (p = 0.039) in the MFC. Excellent tissue fill, lateral integration and proteoglycan staining was observed. Only the rhFGF18 defects showed pericellular type VI collagen staining with positive type II collagen and reduced positive type I collagen staining. The majority of defects in the control and BMP-7 groups demonstrated fibrocartilagenous repair tissue. CONCLUSION Statistically significant improvements in gross repair, mechanical properties and histological score were found over empty defects when Chondromimetic was combined with rhFGF18. These results suggest that rhFGF18 may play a significant role in articular cartilage repair applications.
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Affiliation(s)
- Alan Getgood
- The Fowler Kennedy Sport Medicine Clinic 3M Centre, The University of Western Ontario, London, N6A 3K7, Ontario, Canada.
| | - Frances Henson
- Department of Veterinary Medicine, University of Cambridge, Cambridge, UK.
| | - Carrie Skelton
- The University of Cambridge Orthopaedic Research Unit, Cambridge, UK.
| | - Roger Brooks
- The University of Cambridge Orthopaedic Research Unit, Cambridge, UK.
| | | | - Lisa A Fortier
- Department of Clinical Sciences, Cornell University, Ithaca, USA.
| | - Neil Rushton
- The University of Cambridge Orthopaedic Research Unit, Cambridge, UK.
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Young-Li N, Simons E, Blansit K, Brooks R, Ueda S, Kapp D, Chan J. P206 Factors associated with survival differences in immigrant Asians versus USA-born Asians with uterine cancer. Eur J Cancer 2014. [DOI: 10.1016/j.ejca.2014.03.250] [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: 11/16/2022]
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McNamara I, Howard J, Rayment A, Schalk R, Brooks R, Best S, Rushton N. Mechanical properties of morcellised bone graft with the addition of hydroxyapatite. J Mater Sci Mater Med 2014; 25:321-327. [PMID: 24390340 DOI: 10.1007/s10856-013-5085-0] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/03/2013] [Accepted: 10/25/2013] [Indexed: 06/03/2023]
Abstract
Mixtures of morcellised bone graft (MBG) and hydroxyapatite (HA) are frequently used in revision arthroplasty surgery. However, the changes in the mechanical properties from adding HA to MBG are unknown. This study used a uniaxial compression test to replicate impaction bone grafting and subsequent early postoperative weightbearing to investigate the effect of adding different proportion of HA to MBG. To achieve this aim, human MBG was subjected to increasing impaction forces and the apparent stiffness and creep for each stress level determined. Subsequently, increasing proportions porous and non porous HA were added to the MBG. The major findings were that the apparent stiffness for MBG increased and the associated creep decreased both with the application of increasing stress and with the addition of increasing proportions of HA. In conclusion, greater proportions of HA in the graft mixture improved the mechanical response compared with MBG impacted under the same force. This improvement replicated the properties of pure MBG under high axial stress. This study indicates that graft mixtures of MBG and HA can be tailormade for patients. The need for less impaction force in MBG:HA mixtures to obtain the same properties as pure MBG may decrease the risk of intraoperative fracture.
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Affiliation(s)
- I McNamara
- Norfolk and Norwich University Hospital NHS foundation trust, Norwich, NR4 7UY, UK,
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Ahmad Z, Brooks R, Kang SN, Weaver H, Nunney I, Tytherleigh-Strong G, Rushton N. The effect of platelet-rich plasma on clinical outcomes in lateral epicondylitis. Arthroscopy 2013; 29:1851-62. [PMID: 24060428 DOI: 10.1016/j.arthro.2013.07.272] [Citation(s) in RCA: 54] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/05/2013] [Accepted: 07/24/2013] [Indexed: 02/06/2023]
Abstract
PURPOSE To evaluate the evidence for application of platelet-rich plasma (PRP) in lateral epicondylitis. METHODS We carried out a systematic review of the current evidence on the effects of PRP in lateral epicondylitis on clinical outcomes. We performed a comprehensive search of the PubMed, Medline, Cochrane, CINAHL (Cumulative Index to Nursing and Allied Health Literature), and Embase databases using various combinations of the commercial names of each PRP preparation and "lateral epicondylitis" (with its associated terms), looking specifically at human studies. Data validity was assessed and collected on clinical outcome. RESULTS Nine studies met the inclusion criteria, of which 5 were randomized controlled trials. Two cohort studies showed that PRP improved clinical satisfaction scores. One case-control study showed that PRP yielded a significantly greater improvement in symptoms compared with bupivacaine. Two randomized controlled trials compared the effect of injections of PRP and blood. Only 1 of the studies noted a significant difference at the 6-week time point. Three randomized controlled trials compared corticosteroids with PRP. Two of the smaller trials, which had follow-up periods of 6 weeks and 3 months, showed no significant difference between treatment groups. The largest randomized controlled trial found that PRP had significant benefit compared with corticosteroids with regard to pain and Disabilities of the Arm, Shoulder and Hand scores at 1- and 2-year time points. CONCLUSIONS This review highlights the limited but evolving evidence for the use of PRP in lateral epicondylitis; however, further research is required to understand the concentration and preparation that facilitate the best clinical outcome. Characterizing the timing of the intervention would optimize the health economics behind the decision to treat for the patient and health care provider. LEVEL OF EVIDENCE Level III, systematic review of Level I to III studies.
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Affiliation(s)
- Zafar Ahmad
- Department of Orthopaedics, Norfolk and Norwich University Hospital, Norwich, England.
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Simons E, Blansit K, Brooks R, Ueda S, Kapp D, Chan J. Factors associated with differences in survival of immigrants vs. U.S. born asians with uterine cancer. Gynecol Oncol 2013. [DOI: 10.1016/j.ygyno.2013.07.048] [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: 10/26/2022]
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Abramowitz M, Bossart E, Martin L, Brooks R, Lathuiliere F, Laura F, Iskanian A, Pollack A. Noninvasive Real-Time Prostate Tracking Using a Transperineal Ultrasound: A Clinical Trial Comparison to RF Transponders With Visual Confirmation. Int J Radiat Oncol Biol Phys 2013. [DOI: 10.1016/j.ijrobp.2013.06.1810] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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Enea D, Gwynne J, Kew S, Arumugam M, Shepherd J, Brooks R, Ghose S, Best S, Cameron R, Rushton N. Collagen fibre implant for tendon and ligament biological augmentation. In vivo study in an ovine model. Knee Surg Sports Traumatol Arthrosc 2013; 21:1783-93. [PMID: 22714976 DOI: 10.1007/s00167-012-2102-7] [Citation(s) in RCA: 41] [Impact Index Per Article: 3.7] [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] [Received: 12/15/2011] [Accepted: 06/05/2012] [Indexed: 02/04/2023]
Abstract
PURPOSE Although most in vitro studies indicate that collagen is a suitable biomaterial for tendon and ligament tissue engineering, in vivo studies of implanted collagen for regeneration of these tissues are still lacking. The objectives of this study were the following: (1) to investigate the regeneration of the central third of the ovine patellar tendon using implants made of an open array of collagen fibres (reconstituted, extruded bovine collagen); and (2) to compare two collagen crosslinking chemistries: carbodiimide and carbodiimide associated with ethyleneglycoldiglycidylether. METHODS Forty-eight Welsh Mountain sheep were operated on their right hind leg. The central third of patellar tendon was removed and substituted with carbodiimide (n = 16) and carbodiimide-ethyleneglycoldiglycidylether-crosslinked implants (n = 16). In the control group the defect was left empty (n = 16). The central third of contralateral unoperated tendons was used as positive controls. Half of the sheep in each group were killed at 3- and 6-month time points. After proper dissection, tendon sub-units (medial, central and lateral) were tested to failure (n = 6 for each group), whilst 2 non-dissected samples were used for histology. RESULTS Both the implants had significantly lower stress to failure and modulus with respect to native tendon at both 3- and at 6-month time points. The implants did not statistically differ in stress to failure, whilst carbodiimide-crosslinked implants had significantly higher modulus than carbodiimide-ethyleneglycoldiglycidylether-crosslinked implants both at 3 and at 6 months. Histology showed carbodiimide-crosslinked implants to have a better integration with the native tendon than carbodiimide-ethyleneglycoldiglycidylether-crosslinked implants. Carbodiimide-crosslinked implants appeared partially resorbed and showed increased tissue ingrowth with respect to carbodiimide-ethyleneglycoldiglycidylether-crosslinked implants. CONCLUSIONS To deliver collagen implants as an open array of fibres allows optimal tendon-implant integration and good ingrowth of regenerated tissue. In the present study the resorption rate of both the examined implants was too low due to the high level of crosslinking. This led to only minor substitution of the implant with regenerated tissue, which in turn produced a low-strength implanted region. Further studies are needed to find the right balance between strength and resorption rate of collagen fibres.
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Affiliation(s)
- Davide Enea
- Department of Surgery, Orthopaedic Research Unit, Cambridge University, Box 180, Addenbrooke's Hospital, Hills Rd, Cambridge, CB2 2QQ, UK.
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Bavan B, Popat R, Blansit K, Kiet T, Brooks R, Chen L, Ueda S, Kapp D, Chan J. Clinical nomogram to predict for para-aortic lymph node metastasis in advanced-stage endometrial cancer patients. Gynecol Oncol 2013. [DOI: 10.1016/j.ygyno.2013.04.245] [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: 10/26/2022]
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Fuh K, Yu X, Blansit K, Brooks R, Ueda S, Chen L, Chan J. A health care economic analysis of robotic surgery for endometrial cancer: A nationwide study of 420 hospitals. Gynecol Oncol 2013. [DOI: 10.1016/j.ygyno.2013.04.443] [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: 10/26/2022]
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Simons E, Blansit K, Kiet T, Brooks R, Ueda S, Chen L, Kapp D, Chan J. Serous tubal vs. ovarian vs. peritoneal vs. uterine cancers - A study of 12,369 women. Gynecol Oncol 2013. [DOI: 10.1016/j.ygyno.2013.04.336] [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: 10/26/2022]
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Fuh K, Blansit K, Brooks R, Ueda S, Chen L, Yu X, Chan J. Surgical complications associated with robotic, laparoscopic, and open approaches in endometrial cancer: A study of 6,560 patients. Gynecol Oncol 2013. [DOI: 10.1016/j.ygyno.2013.04.441] [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: 11/27/2022]
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Pitchers WR, Brooks R, Jennions MD, Tregenza T, Dworkin I, Hunt J. Limited plasticity in the phenotypic variance-covariance matrix for male advertisement calls in the black field cricket, Teleogryllus commodus. J Evol Biol 2013; 26:1060-78. [PMID: 23530814 PMCID: PMC3641675 DOI: 10.1111/jeb.12120] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.1] [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: 09/25/2012] [Revised: 01/03/2013] [Accepted: 01/04/2013] [Indexed: 11/30/2022]
Abstract
Phenotypic integration and plasticity are central to our understanding of how complex phenotypic traits evolve. Evolutionary change in complex quantitative traits can be predicted using the multivariate breeders' equation, but such predictions are only accurate if the matrices involved are stable over evolutionary time. Recent study, however, suggests that these matrices are temporally plastic, spatially variable and themselves evolvable. The data available on phenotypic variance-covariance matrix (P) stability are sparse, and largely focused on morphological traits. Here, we compared P for the structure of the complex sexual advertisement call of six divergent allopatric populations of the Australian black field cricket, Teleogryllus commodus. We measured a subset of calls from wild-caught crickets from each of the populations and then a second subset after rearing crickets under common-garden conditions for three generations. In a second experiment, crickets from each population were reared in the laboratory on high- and low-nutrient diets and their calls recorded. In both experiments, we estimated P for call traits and used multiple methods to compare them statistically (Flury hierarchy, geometric subspace comparisons and random skewers). Despite considerable variation in means and variances of individual call traits, the structure of P was largely conserved among populations, across generations and between our rearing diets. Our finding that P remains largely stable, among populations and between environmental conditions, suggests that selection has preserved the structure of call traits in order that they can function as an integrated unit.
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Affiliation(s)
- W R Pitchers
- Department of Zoology, Program in Ecology Evolutionary Biology and Behavior, Michigan State University, East Lansing, MI 48824, USA.
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Getgood A, Henson F, Skelton C, Herrera E, Brooks R, Fortier LA, Rushton N. The Augmentation of a Collagen/Glycosaminoglycan Biphasic Osteochondral Scaffold with Platelet-Rich Plasma and Concentrated Bone Marrow Aspirate for Osteochondral Defect Repair in Sheep: A Pilot Study. Cartilage 2012; 3:351-63. [PMID: 26069645 PMCID: PMC4297149 DOI: 10.1177/1947603512444597] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/16/2023] Open
Abstract
OBJECTIVE This study investigates the combination of platelet-rich plasma (PRP) or concentrated bone marrow aspirate (CBMA) with a biphasic collagen/glycosaminoglycan (GAG) osteochondral scaffold for the treatment of osteochondral defects in sheep. DESIGN Acute osteochondral defects were created in the medial femoral condyle (MFC) and the lateral trochlea sulcus (LTS) of 24 sheep (n = 6). Defects were left empty or filled with a 6 × 6-mm scaffold, either on its own or in combination with PRP or CBMA. Outcome measures at 6 months included mechanical testing, International Cartilage Repair Society (ICRS) repair score, modified O'Driscoll histology score, qualitative histology, and immunohistochemistry for type I, II, and VI collagen. RESULTS No differences in mechanical properties, ICRS repair score, or modified O'Driscoll score were detected between the 4 groups. However, qualitative assessments of the histological architecture, Safranin O content, and collagen immunohistochemistry indicated that in the PRP/scaffold groups, there was a more hyaline cartilage-like tissue repair. In addition, the addition of CBMA and PRP to the scaffold reduced cyst formation in the subchondral bone of healed lesions. CONCLUSION There was more hyaline cartilage-like tissue formed in the PRP/scaffold group and less subchondral cystic lesion formation in the CBMA and PRP/scaffold groups, although there were no quantitative differences in the repair tissue formed.
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Affiliation(s)
- Alan Getgood
- Fowler Kennedy Sport Medicine Clinic, University of Western Ontario, London, Ontario, Canada
| | - Frances Henson
- Department of Veterinary Medicine, University of Cambridge, Cambridge, UK
| | - Carrie Skelton
- Orthopaedic Research Unit, University of Cambridge, Cambridge, UK
| | - Emilio Herrera
- Department of Physiology, University of Cambridge, Cambridge, UK
| | - Roger Brooks
- Orthopaedic Research Unit, University of Cambridge, Cambridge, UK
| | | | - Neil Rushton
- Orthopaedic Research Unit, University of Cambridge, Cambridge, UK
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Simons E, Kiet T, Amanam I, Chen L, Brooks R, Ueda S, Kapp D, Chan J. Improved outcomes of younger compared to older ovarian cancer patients — What is the role of immune regulation? Gynecol Oncol 2012. [DOI: 10.1016/j.ygyno.2012.07.041] [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: 11/15/2022]
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Harris K, Kiet T, Amanam I, Chen L, Brooks R, Ueda S, Kapp D, Chan J. The potential role of immune regulation in the presentation of early vs. advanced ovarian cancer. Gynecol Oncol 2012. [DOI: 10.1016/j.ygyno.2012.07.039] [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: 11/26/2022]
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Amanam I, Kiet T, Young-Lin N, Chen L, Brooks R, Ueda S, Monk B, Kapp D, Hoth D, Chan J. Predictive model for cancer drug approval – An analysis of FDA drug submissions over the last decade. Gynecol Oncol 2012. [DOI: 10.1016/j.ygyno.2012.07.038] [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: 11/15/2022]
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Amanam I, Kiet T, Young-Lin N, Chen L, Brooks R, Ueda S, Monk B, Kapp D, Hoth D, Chan J. Applications for oncologic drugs — Lessons from the oncologic drug advisory committee. Gynecol Oncol 2012. [DOI: 10.1016/j.ygyno.2012.07.037] [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: 10/28/2022]
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Getgood AMJ, Kew SJ, Brooks R, Aberman H, Simon T, Lynn AK, Rushton N. Evaluation of early-stage osteochondral defect repair using a biphasic scaffold based on a collagen-glycosaminoglycan biopolymer in a caprine model. Knee 2012; 19:422-30. [PMID: 21620711 DOI: 10.1016/j.knee.2011.03.011] [Citation(s) in RCA: 73] [Impact Index Per Article: 6.1] [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] [Received: 01/11/2011] [Revised: 03/31/2011] [Accepted: 03/31/2011] [Indexed: 02/02/2023]
Abstract
The aim of this study was to evaluate a new collagen-GAG-calcium phosphate biphasic scaffold for the repair of surgically created osteochondral defects in goats. Comparison of morphological, histological and mechanical performance of the repair tissue was made with defects repaired using a synthetic polymer scaffold. Defects were created in the medial femoral condyle (MFC) and lateral trochlear sulcus (LTS) of Boer Cross goats and evaluated at 12 and 26 weeks. It was found that the total histology score of the collagen-GAG based biomaterial (23.8; SD 1.7) provided a significant improvement (p<0.05) over the biphasic PLGA material (19;3) and the empty control defect (17.3;1.2) in the LTS. The overall trajectory of histological and morphological improvement between 12 and 26 weeks was found to be higher for the collagen-GAG scaffold compared to the PLGA material. The occurrence of sub-chondral bone cysts was lower for the collagen-GAG scaffold with an incidence of 17% of defects, compared to 67% for the PLGA material at 26 weeks. The cartilage repair tissue for both materials evaluated was superior after 26 weeks implantation than the empty control with 75% of the collagen-GAG-treated defects showing markedly more hyaline-like cartilage and 50% of the PLGA sites exhibiting hyaline-like appearances, compared to 17% for the empty control. These early stage data indicate biphasic scaffolds based on collagen-GAG and PLGA both provide indications of satisfactory development of a structural repair to surgically prepared osteochondral defects. Furthermore, the biomaterial composition of the collagen-GAG may provide a more favourable environment for osteochondral repair.
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Affiliation(s)
- Alan M J Getgood
- The University of Cambridge Orthopaedic Research Unit, Box 180, Addenbrooke's Hospital, Hills Road, Cambridge, CB2 2QQ, UK.
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Ahmad Z, Wardale J, Brooks R, Henson F, Noorani A, Rushton N. Exploring the application of stem cells in tendon repair and regeneration. Arthroscopy 2012; 28:1018-29. [PMID: 22381688 DOI: 10.1016/j.arthro.2011.12.009] [Citation(s) in RCA: 77] [Impact Index Per Article: 6.4] [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] [Received: 10/31/2011] [Revised: 11/23/2011] [Accepted: 12/02/2011] [Indexed: 02/08/2023]
Abstract
PURPOSE To conduct a systematic review of the current evidence for the effects of stem cells on tendon healing in preclinical studies and human studies. METHODS A systematic search of the PubMed, CINAHL (Cumulative Index to Nursing and Allied Health Literature), Cochrane, and Embase databases was performed for stem cells and tendons with their associated terminology. Data validity was assessed, and data were collected on the outcomes of trials. RESULTS A total of 27 preclinical studies and 5 clinical studies met the inclusion criteria. Preclinical studies have shown that stem cells are able to survive and differentiate into tendon cells when placed into a new tendon environment, leading to regeneration and biomechanical benefit to the tendon. Studies have been reported showing that stem cell therapy can be enhanced by molecular signaling adjunct, mechanical stimulation of cells, and the use of augmentation delivery devices. Studies have also shown alternatives to the standard method of bone marrow-derived mesenchymal stem cell therapy. Of the 5 human studies, only 1 was a randomized controlled trial, which showed that skin-derived tendon cells had a greater clinical benefit than autologous plasma. One cohort study showed the benefit of stem cells in rotator cuff tears and another in lateral epicondylitis. Two of the human studies showed how stem cells were successfully extracted from the humerus and, when tagged with insulin, became tendon cells. CONCLUSIONS The current evidence shows that stem cells can have a positive effect on tendon healing. This is most likely because stem cells have regeneration potential, producing tissue that is similar to the preinjury state, but the results can be variable. The use of adjuncts such as molecular signaling, mechanical stimulation, and augmentation devices can potentially enhance stem cell therapy. Initial clinical trials are promising, with adjuncts for stem cell therapy in development.
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Affiliation(s)
- Zafar Ahmad
- Orthopaedic Research Unit, Addenbrooke's Hospital, Cambridge, England.
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Schuler PK, Herrey A, Wade A, Brooks R, Peebles D, Lambiase P, Walker F. Pregnancy outcome and management of women with an implantable cardioverter defibrillator: a single centre experience. Europace 2012; 14:1740-5. [DOI: 10.1093/europace/eus172] [Citation(s) in RCA: 40] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
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Meyer F, Wardale J, Best S, Cameron R, Rushton N, Brooks R. Effects of lactic acid and glycolic acid on human osteoblasts: a way to understand PLGA involvement in PLGA/calcium phosphate composite failure. J Orthop Res 2012; 30:864-71. [PMID: 22105618 DOI: 10.1002/jor.22019] [Citation(s) in RCA: 63] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/29/2011] [Accepted: 10/31/2011] [Indexed: 02/04/2023]
Abstract
The use of degradable composite materials in orthopedics remains a field of intense research due to their ability to support new bone formation and degrade in a controlled manner, broadening their use for orthopedic applications. Poly (lactide-co-glycolide) acid (PLGA), a degradable biopolymer, is now a popular material for different orthopedic applications and is proposed for use in tissue engineering scaffolds either alone or combined with bioactive ceramics. Interference screws composed of calcium phosphates and PLGA are readily available in the market. However, some reports highlight problems of screw migration or aseptic cyst formation following screw degradation. In order to understand these phenomena and to help to improve implant formulation, we have evaluated the effects of PLGA degradation products: lactic acid and glycolic acid on human osteoblasts in vitro. Cell proliferation, differentiation, and matrix mineralization, important for bone healing were studied. It was found that the toxicity of polymer degradation products under buffering conditions was limited to high concentrations. However, non-toxic concentrations led to a decrease in cell proliferation, rapid cell differentiation, and mineralization failure. Calcium, whilst stimulating cell proliferation was not able to overcome the negative effects of high concentrations of lactic and glycolic acids on osteoblasts. These effects help to explain recently reported clinical failures of calcium phosphate/PLGA composites, but further in vitro analyses are needed to mimic the dynamic situation which occurs in the body by, for example, culture of osteoblasts with materials that have been pre-degraded to different extents and thus be able to relate these findings to the degradation studies that have been performed previously.
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Affiliation(s)
- Florent Meyer
- Orthopaedic Research Unit, University of Cambridge, Cambridge, United Kingdom.
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Brooks R, Ghezelayagh T, Kiet T, Fuh K, Ueda S, Longacre T, Teng N, Chen L, Chan J. The impact of chemotherapy and fertility-sparing surgery on recurrence of serous borderline ovarian tumors: A multi-institutional study of 491 patients. Gynecol Oncol 2012. [DOI: 10.1016/j.ygyno.2011.12.007] [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]
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Brooks R, Rose RJ, Sheahan MB, Kurdyukov S. Whole Genome Methylation Scanning Based on phi29 Polymerase Amplification. Biochemistry (Mosc) 2012; 76:999-1002. [PMID: 22082267 DOI: 10.1134/s0006297911090021] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Abstract
Identifying differences in DNA methylation is critical to understanding how epigenetics influences gene expression during processes such as development. Here, we propose a method that employs a single, methylation-sensitive restriction endonuclease of choice, to produce discrete pools of methylated and unmethylated DNA from the same sample. A pool of restriction fragments representing unmethylated regions of the genome is first obtained by digestion with a methylation-sensitive endonuclease. The restriction-digested DNA is then concatamerized in the presence of stuffer-adaptor DNA, which prevents interference from originally unmethylated DNA by blocking the ends of the restriction fragments. The concatamerized DNA is amplified by phi29 polymerase to remove methylation marks, and again digested with the same endonuclease to produce a pool of DNA fragments representing methylated portions of the genome. The two pools of DNA fragments thus obtained can be analyzed by end-sequencing or hybridization to a genomic array. In this report we detail a proof of concept experiment that demonstrates the feasibility of our method.
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Affiliation(s)
- R Brooks
- Australian Research Council Centre of Excellence for Integrative Legume Research, School of Environmental and Life Sciences, The University of Newcastle, Callaghan, New South Wales, Australia
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