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Wu EY, Oliver M, Scheck J, Lapidus S, Akca UK, Yasin S, Stern SM, Insalaco A, Pardeo M, Simonini G, Marrani E, Wang X, Huang B, Kovalick LK, Rosenwasser N, Casselman G, Liau A, Shao Y, Yang C, Mosa DM, Tucker L, Girschick H, Laxer RM, Akikusa JD, Hedrich CM, Onel K, Dedeoglu F, Twilt M, Ferguson PJ, Ozen S, Zhao Y. Feasibility of Conducting Comparative Effectiveness Research and Validation of a Clinical Disease Activity Score for Chronic Nonbacterial Osteomyelitis. J Rheumatol 2023; 50:1333-1340. [PMID: 37399459 PMCID: PMC10543471 DOI: 10.3899/jrheum.2022-1323] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 06/02/2023] [Indexed: 07/05/2023]
Abstract
OBJECTIVE Prospective comparative effectiveness research (CER) in chronic nonbacterial osteomyelitis (CNO) is lacking. Our objectives were to (1) determine the use and safety of each consensus treatment plan (CTP) regimen for CNO, (2) assess the feasibility of using the Chronic Nonbacterial Osteomyelitis International Registry (CHOIR) data for CER, and (3) develop and validate a CNO clinical disease activity score (CDAS) using CHOIR. METHODS Consenting children or young adults with CNO were enrolled into CHOIR. Demographic, clinical, and imaging data were prospectively collected. The CNO CDAS was developed through a Delphi survey and nominal group technique. External validation surveys were administered to CHOIR participants. RESULTS One hundred forty (78.2%) CHOIR participants enrolled between August 2018 and September 2020 received at least 1 CTP regimen. Baseline characteristics from different CTP groups were well matched. Patient pain, patient global assessment, and clinical CNO lesion count were key variables included in the CNO CDAS. The CDAS showed a strong correlation with patient/parent report of difficulty using a limb, back, or jaw and patient/parent report of disease severity, but a weak correlation with patient/parent report of fatigue, sadness, and worry. The change in CDAS was significant in patients reporting disease worsening or improvement (P < 0.001). The CDAS significantly decreased after initiating second-line treatments from median 12.0 (IQR 8.0-15.5) to 5.0 (IQR 3.0-12.0; P = 0.002). Although second-line treatments were well tolerated, psoriasis was the most common adverse event. CONCLUSION The CNO CDAS was developed and validated for disease monitoring and assessment of treatment effectiveness. CHOIR provided a comprehensive framework for future CER.
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Affiliation(s)
- Eveline Y Wu
- E.Y. Wu, MD, MSCR, L.K. Kovalick, PNP, Division of Rheumatology, Department of Pediatrics, The University of North Carolina at Chapel Hill, Chapel Hill, North Carolina, USA
| | - Melissa Oliver
- M. Oliver, MD, MS, Division of Pediatric Rheumatology, Indiana University School of Medicine, Indianapolis, Indiana, USA
| | - Joshua Scheck
- J. Scheck, BS, N. Rosenwasser, MD, G. Casselman, BS, A. Liau, BS, Y. Shao, BS, C. Yang, BS, Y. Zhao, MD, PhD, Division of Pediatric Rheumatology, Seattle Children's Hospital, University of Washington, Seattle, Washington, USA
| | - Sivia Lapidus
- S. Lapidus, MD, Division of Rheumatology, Department of Pediatrics, Joseph M. Sanzari Children's Hospital, Hackensack University Medical Center and Hackensack Meridian School of Medicine, Hackensack, New Jersey, USA
| | - Ummusen Kaya Akca
- U. Kaya Akca, MD, S. Ozen, MD, Division of Rheumatology, Department of Pediatrics, Hacettepe University, Ankara, Turkey
| | - Shima Yasin
- S. Yasin, MD, MSc, P.J. Ferguson, MD, Division of Rheumatology, Allergy and Immunology, Department of Pediatrics, University of Iowa Carver College of Medicine, Iowa City, Iowa, USA
| | - Sara M Stern
- S.M. Stern, MD, Division of Rheumatology, Department of Pediatrics, The University of Utah, Salt Lake City, Utah, USA
| | - Antonella Insalaco
- A. Insalaco, MD, M. Pardeo, MD, Division of Rheumatology, ERN RITA Center, IRCCS Ospedale Pediatrico Bambino Gesù, Roma, Italy
| | - Manuela Pardeo
- A. Insalaco, MD, M. Pardeo, MD, Division of Rheumatology, ERN RITA Center, IRCCS Ospedale Pediatrico Bambino Gesù, Roma, Italy
| | - Gabriele Simonini
- G. Simonini, MD, E. Marrani, MD, Rheumatology Unit, ERN ReCONNET Center, Meyer Children's Hospital IRCCS, Florence, Italy
| | - Edoardo Marrani
- G. Simonini, MD, E. Marrani, MD, Rheumatology Unit, ERN ReCONNET Center, Meyer Children's Hospital IRCCS, Florence, Italy
| | - Xing Wang
- X. Wang, PhD, Biostatistics Epidemiology and Analytics in Research, Seattle Children's Research Institute, Seattle, Washington, USA
| | - Bin Huang
- B. Huang, PhD, Division of Biostatistics and Epidemiology, Cincinnati Children's Hospital Medical Center, University of Cincinnati College of Medicine, Cincinnati, Ohio, USA
| | - Leonard K Kovalick
- E.Y. Wu, MD, MSCR, L.K. Kovalick, PNP, Division of Rheumatology, Department of Pediatrics, The University of North Carolina at Chapel Hill, Chapel Hill, North Carolina, USA
| | - Natalie Rosenwasser
- J. Scheck, BS, N. Rosenwasser, MD, G. Casselman, BS, A. Liau, BS, Y. Shao, BS, C. Yang, BS, Y. Zhao, MD, PhD, Division of Pediatric Rheumatology, Seattle Children's Hospital, University of Washington, Seattle, Washington, USA
| | - Gabriel Casselman
- J. Scheck, BS, N. Rosenwasser, MD, G. Casselman, BS, A. Liau, BS, Y. Shao, BS, C. Yang, BS, Y. Zhao, MD, PhD, Division of Pediatric Rheumatology, Seattle Children's Hospital, University of Washington, Seattle, Washington, USA
| | - Adriel Liau
- J. Scheck, BS, N. Rosenwasser, MD, G. Casselman, BS, A. Liau, BS, Y. Shao, BS, C. Yang, BS, Y. Zhao, MD, PhD, Division of Pediatric Rheumatology, Seattle Children's Hospital, University of Washington, Seattle, Washington, USA
| | - Yurong Shao
- J. Scheck, BS, N. Rosenwasser, MD, G. Casselman, BS, A. Liau, BS, Y. Shao, BS, C. Yang, BS, Y. Zhao, MD, PhD, Division of Pediatric Rheumatology, Seattle Children's Hospital, University of Washington, Seattle, Washington, USA
| | - Claire Yang
- J. Scheck, BS, N. Rosenwasser, MD, G. Casselman, BS, A. Liau, BS, Y. Shao, BS, C. Yang, BS, Y. Zhao, MD, PhD, Division of Pediatric Rheumatology, Seattle Children's Hospital, University of Washington, Seattle, Washington, USA
| | - Doaa Mosad Mosa
- D.M. Mosa, MD, Rheumatology and Rehabilitation Department, Mansoura University Hospitals, Mansoura University, Mansoura City, Egypt
| | - Lori Tucker
- L. Tucker, MD, Division of Rheumatology, BC Children's Hospital, University of British Columbia, Vancouver, British Columbia, Canada
| | - Hermann Girschick
- H. Girschick, Department of Pediatrics, Vivantes Clinic Friedrichshain, Berlin, Germany
| | - Ronald M Laxer
- R.M. Laxer, The Hospital for Sick Children and the University of Toronto, Toronto, Ontario, Canada
| | | | - Christian M Hedrich
- C.M. Hedrich, MD, PhD, Alder Hey Children's NHS Foundation Trust, Eaton Road, Liverpool, UK
| | - Karen Onel
- K. Onel, MD, Division of Pediatric Rheumatology, Hospital for Special Surgery, New York, New York, USA
| | - Fatma Dedeoglu
- F. Dedeoglu, MD, Division of Immunology, Boston Children's Hospital, Harvard Medical School, Boston, Massachusetts, USA
| | - Marinka Twilt
- M. Twilt, MD, Division of Rheumatology, Department of Paediatrics, Alberta Children's Hospital, Calgary, Alberta, Canada
| | - Polly J Ferguson
- S. Yasin, MD, MSc, P.J. Ferguson, MD, Division of Rheumatology, Allergy and Immunology, Department of Pediatrics, University of Iowa Carver College of Medicine, Iowa City, Iowa, USA
| | - Seza Ozen
- U. Kaya Akca, MD, S. Ozen, MD, Division of Rheumatology, Department of Pediatrics, Hacettepe University, Ankara, Turkey
| | - Yongdong Zhao
- J. Scheck, BS, N. Rosenwasser, MD, G. Casselman, BS, A. Liau, BS, Y. Shao, BS, C. Yang, BS, Y. Zhao, MD, PhD, Division of Pediatric Rheumatology, Seattle Children's Hospital, University of Washington, Seattle, Washington, USA;
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Yang C, Rosenwasser N, Wang X, Xu Z, Scheck J, Boos MD, Gupta D, Brandling-Bennet HA, Sidbury R, Iyer RS, Zhao Y. Golimumab in Children with Chronic Recurrent Multifocal Osteomyelitis: A Case Series and Review of the Literature. Paediatr Drugs 2023; 25:603-611. [PMID: 37479948 DOI: 10.1007/s40272-023-00581-y] [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] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Accepted: 06/20/2023] [Indexed: 07/23/2023]
Abstract
BACKGROUND Chronic recurrent multifocal osteomyelitis (CRMO) is a rare autoinflammatory bone disease requiring immunosuppressive treatment in half of patients. Monoclonal tumor necrosis factor inhibitors (TNFi) are often used as effective second-line off-label therapies. However, paradoxical psoriasis can occur in a subset of patients exposed to monoclonal TNFi and can prompt conversion to alternate therapy if severe. OBJECTIVE The aim of this study was to determine the efficacy and safety of golimumab, a fully humanized TNFi, in children with CRMO, including those who develop paradoxical psoriasis after exposure to other monoclonal TNFi. METHODS A retrospective chart review was conducted of patients with CRMO who received golimumab in a single center between 01 June, 2018 and 31 December, 2020. Patients who were diagnosed before 21 years of age and followed up for CRMO at least once after receiving ≥ 3 months of golimumab were included. Extracted data included patient demographics, whole-body MRI lesion counts, clinically relevant data, laboratory results, patient-reported outcomes, and psoriasis burden. Linear mixed models with log-transformed outcomes were used to assess changes in the outcomes over time. The random effect is included in the model to account for the within-subject correlation of repeated measures. p-values and 95% confidence intervals were reported. RESULTS Eighteen patients were included. Patients were observed for a median of 9.95 months [interquartile range 3.84-15.64]. The median age at the initiation of golimumab was 10.95 years [9.86-13.77] and the median duration of disease between the disease onset and the initiation of golimumab was 2.60 years [1.66-3.62]. Ten patients received golimumab via intravenous route and eight patients received golimumab via subcutaneous route. The median dose was 1.64 mg/kg/month [1.46, 2]. Fourteen patients were previously treated with disease-modifying antirheumatic drugs and 17 with other TNFi. Patients treated with golimumab showed significant improvement in median physician global assessment for CRMO from 2.00 [1.00-3.00] to 0.00 [0.00-0.25] by the fourth visit (p < 0.001), with median erythrocyte sedimentation rate (ESR) decreasing significantly from 12.00 [6.75-23.75] to 5.00 [3.00-10.00] by the fourth visit (p < 0.05). The median number of lesions on MRI decreased significantly from 3.50 [2.00-5.50] to 0.50 [0.00-4.25] lesions per patient (p < 0.01). Nine out of 12 patients who had previous paradoxical psoriasis associated with adalimumab or infliximab had persistent active psoriasis at study baseline. For patients with psoriasis at study baseline, the prevalence of psoriasis had decreased from 100% to approximately 50-57% at the following visits. Of the 18 patients initiated on golimumab in this study, there was only one new case of mild psoriasis in a patient with previously resolved infliximab-associated paradoxical psoriasis. No serious infections or adverse events were noted during the study. Two patients in the study showed clinical improvement with concomitant golimumab and ustekinumab with no reported adverse side effects or increased effects in these patients over a 16-month interval, showing that this combination can be safe and effective for children with CRMO. CONCLUSION In our experience, golimumab has been shown to be a safe and effective therapy for CRMO and demonstrated improvement in paradoxical psoriasis in many patients. Longer follow-up periods would be helpful to develop longer term outcomes data for patients with CRMO and overall paradoxical psoriasis risk.
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Affiliation(s)
- Claire Yang
- Pediatric Rheumatology, Department of Pediatrics, Seattle Children's Hospital, University of Washington, MA 7.110, 4800 Sand Point Way NE, Seattle, WA, 98105, USA
| | - Natalie Rosenwasser
- Pediatric Rheumatology, Department of Pediatrics, Seattle Children's Hospital, University of Washington, MA 7.110, 4800 Sand Point Way NE, Seattle, WA, 98105, USA
- Center for Clinical and Translational Research, Seattle Children's Hospital, Seattle, WA, USA
| | - Xing Wang
- Center for Clinical and Translational Research, Seattle Children's Hospital, Seattle, WA, USA
| | - Zheng Xu
- Pediatric Rheumatology, Department of Pediatrics, Seattle Children's Hospital, University of Washington, MA 7.110, 4800 Sand Point Way NE, Seattle, WA, 98105, USA
| | - Joshua Scheck
- Pediatric Rheumatology, Department of Pediatrics, Seattle Children's Hospital, University of Washington, MA 7.110, 4800 Sand Point Way NE, Seattle, WA, 98105, USA
| | - Markus D Boos
- Pediatric Dermatology, Department of Pediatrics, Seattle Children's Hospital, University of Washington, Seattle, WA, USA
| | - Deepti Gupta
- Pediatric Dermatology, Department of Pediatrics, Seattle Children's Hospital, University of Washington, Seattle, WA, USA
| | - Heather A Brandling-Bennet
- Pediatric Dermatology, Department of Pediatrics, Seattle Children's Hospital, University of Washington, Seattle, WA, USA
| | - Robert Sidbury
- Pediatric Dermatology, Department of Pediatrics, Seattle Children's Hospital, University of Washington, Seattle, WA, USA
| | - Ramesh S Iyer
- Department of Radiology, Seattle Children's Hospital, University of Washington, Seattle, WA, USA
| | - Yongdong Zhao
- Pediatric Rheumatology, Department of Pediatrics, Seattle Children's Hospital, University of Washington, MA 7.110, 4800 Sand Point Way NE, Seattle, WA, 98105, USA.
- Center for Clinical and Translational Research, Seattle Children's Hospital, Seattle, WA, USA.
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Balay-Dustrude E, Bhide N, Scheck J, Sullivan E, Cain K, Biswas D, Partridge SC, Zhao Y. Validating within-limb calibrated algorithm using a smartphone attached infrared thermal camera for detection of arthritis in children. J Therm Biol 2023; 111:103437. [PMID: 36585071 DOI: 10.1016/j.jtherbio.2022.103437] [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] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/01/2022] [Revised: 11/10/2022] [Accepted: 12/15/2022] [Indexed: 12/23/2022]
Abstract
OBJECTIVES To determine the impact of physical activity on temperature after within-limb calibration (TAWiC) measures and their reproducibility. To determine if thermal imaging from a smartphone attached thermal camera is comparable to thermal imaging using a handheld thermal camera for detection of arthritis in children. METHODS Children without symptoms were enrolled to the "asymptomatic exercise cohort", and received infrared imaging, using a standard handheld camera, after initial resting period, after activity, and after second resting period. Children seen in the rheumatology clinic with knee pain were enrolled into the "symptomatic knee pain cohort" and received imaging with both the smartphone-attached and handheld cameras before a routine clinical exam. TAWiC was defined as the temperature differences between joint and ipsilateral mid-tibia as the main readout for arthritis detection. RESULTS The asymptomatic exercise cohort demonstrated notable changes in absolute and TAWiC temperatures collected by thermal imaging after physical activity, and temperatures did not consistently return to pre-activity levels after a second period of rest. The 95th TAWiC from anterior view were, resting one -0.1 C (0.5), activity -0.7 C (0.5), resting two -0.2 C (0.6) (resting 1 vs resting 2, p-value = 0.13). In the symptomatic knee pain cohort, the smartphone attached and handheld thermal cameras performed similarly in regards to detection of joint inflammation and evaluation of joint temperature using the TAWiC algorithm, with high sensitivity of 80% (55.2-100.0%) and specificity of 84.2% (76.0-92.4%) in the anterior knee view when compared with the gold standard joint exam performed by a pediatric rheumatologist. The mean 95th TAWiC temperature difference between the two cameras was -0.1 C (-0.1 to 0.0) (p = 0.0004). CONCLUSIONS This study showed continued validity of the TAWiC algorithm across two distinct thermal camera platforms and demonstrates promise for improved accessibility and utility of this technology for arthritis detection.
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Affiliation(s)
- Erin Balay-Dustrude
- Pediatric Rheumatology, Seattle Children's Hospital, Department of Pediatrics, University of Washington, Seattle, WA, USA
| | - Nivrutti Bhide
- Center for Clinical and Translational Research, Seattle Children's Research Institute, Seattle, WA, USA
| | - Joshua Scheck
- Pediatric Rheumatology, Seattle Children's Hospital, Department of Pediatrics, University of Washington, Seattle, WA, USA; Center for Clinical and Translational Research, Seattle Children's Research Institute, Seattle, WA, USA
| | - Erin Sullivan
- Center for Clinical and Translational Research, Seattle Children's Research Institute, Seattle, WA, USA
| | - Kevin Cain
- Department of Statistics, School of Nursing, University of Washington, Seattle, WA, USA
| | - Debosmita Biswas
- Department of Radiology, University of Washington, Seattle, WA, USA
| | | | - Yongdong Zhao
- Pediatric Rheumatology, Seattle Children's Hospital, Department of Pediatrics, University of Washington, Seattle, WA, USA; Center for Clinical and Translational Research, Seattle Children's Research Institute, Seattle, WA, USA.
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Aden S, Wong S, Yang C, Bui T, Higa T, Scheck J, Iyer RS, Egbert M, Lindberg A, Zhao Y. Increasing Cases of Chronic Nonbacterial Osteomyelitis in Children: a series of 215 cases from a single tertiary referral center. J Rheumatol 2022; 49:929-934. [DOI: 10.3899/jrheum.210991] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 03/08/2022] [Indexed: 11/22/2022]
Abstract
Objective Chronic non-bacterial osteomyelitis (CNO) is a rare autoinflammatory bone disease that is gaining recognition from clinicians and researchers. We aim to publish data from our cohort of CNO patients living in the northwestern United States to increase the awareness of specific demographics, characteristics, and presentation of this rare disease. Methods A retrospective chart review was performed of our electronic medical records. Patients with complete chart records that met criteria for a diagnosis of CNO from 2005-2019 were included. Extracted data including patient demographics, bone biopsy results, and lesion locations on advanced imaging were analyzed. King County census data were used to calculate the annual new case rate within our center. Results A total of 215 CNO cases were diagnosed at our large tertiary pediatric hospital. The majority of cases were of Caucasian descent residing in Washington's most populous county, specifically, in King County. Most cases were diagnosed in 2016-2019, showing a significant increase in the annual case rate from 8 to 23 per million children in King County, though there did not appear to be a seasonal predilection. Biopsy rate decreased from 75% to 52%. 152 (71%) children had family history of autoimmunity. With increasing use of whole-body MRI, results demonstrated that 68% had multiple lesions. Conclusion CNO has been diagnosed at an increased rate in recent years. Whole-body MRI may assist in identifying other lesions that may be asymptomatic on presentation. Bone biopsy is still required in some children at time of diagnosis.
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Zhao Y, Iyer RS, Thapa M, Biswas D, Bhide N, Scheck J, Cain K, Partridge SC, Wallace CA. A Novel Algorithm using Within-leg Calibration for Enhanced Accuracy of Detection of Arthritis by Infrared Thermal Imaging in Children. J Rheumatol 2021; 49:81-88. [PMID: 34210832 DOI: 10.3899/jrheum.210077] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 06/11/2021] [Indexed: 10/21/2022]
Abstract
OBJECTIVE To standardize and improve the accuracy of detection of arthritis by thermal imaging. METHODS Children with clinically active arthritis in the knee or ankle, as well as healthy controls, were enrolled to the development cohort and another group of children with knee symptoms were enrolled to the validation cohort. Ultrasound was performed for the arthritis subgroup for the development cohort. Joint exam by certified rheumatologists was used as a reference for the validation cohort. Infrared thermal data were analyzed using a custom software. Temperature after within-limb calibration (TAWiC) was defined as the temperature differences between joint and ipsilateral midtibia. TAWiC of knees and ankles was evaluated using ANOVA across subgroups. Optimal thresholds were determined by receiver operating characteristic (ROC) analysis using Youden index. RESULTS There were significant differences in mean and 95th TAWiC of knee in anterior, medial, lateral views, and of ankles in anterior view, between inflamed and uninflamed counterparts (p<0.05). The area under the curve (AUC) was higher by 36% when using TAWiCKnee than those when using absolute temperature. Within validation cohort, the sensitivity of accurate detection of arthritis in knee using both mean and 95th TAWiC from individual views or combined all 3 views ranged from 0.60 to 0.70 and the specificity was greater than 0.90 in all views. CONCLUSION Children with active arthritis or tenosynovitis in knees or ankles exhibited higher TAWiC than healthy joints. Our validation cohort study showed promise of the clinical utility of infrared thermal imaging for arthritis detection.
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Affiliation(s)
- Yongdong Zhao
- Pediatric Rheumatology, Seattle Children's Hospital, Department of Pediatrics, University of Washington, Seattle, WA; Center for Clinical and Translational Research, Seattle Children's Research Institute, Seattle, WA; Department of Radiology, Seattle Children's Hospital, Seattle, WA; Department of Radiology, University of Washington, Seattle, WA; Department of Statistics, School of Nursing, University of Washington, Seattle, WA. Corresponding author: Yongdong Zhao, MD, PhD MA 7.110, 4800 Sand Point Way NE, Seattle, WA 98105
| | - Ramesh S Iyer
- Pediatric Rheumatology, Seattle Children's Hospital, Department of Pediatrics, University of Washington, Seattle, WA; Center for Clinical and Translational Research, Seattle Children's Research Institute, Seattle, WA; Department of Radiology, Seattle Children's Hospital, Seattle, WA; Department of Radiology, University of Washington, Seattle, WA; Department of Statistics, School of Nursing, University of Washington, Seattle, WA. Corresponding author: Yongdong Zhao, MD, PhD MA 7.110, 4800 Sand Point Way NE, Seattle, WA 98105
| | - Mahesh Thapa
- Pediatric Rheumatology, Seattle Children's Hospital, Department of Pediatrics, University of Washington, Seattle, WA; Center for Clinical and Translational Research, Seattle Children's Research Institute, Seattle, WA; Department of Radiology, Seattle Children's Hospital, Seattle, WA; Department of Radiology, University of Washington, Seattle, WA; Department of Statistics, School of Nursing, University of Washington, Seattle, WA. Corresponding author: Yongdong Zhao, MD, PhD MA 7.110, 4800 Sand Point Way NE, Seattle, WA 98105
| | - Debosmita Biswas
- Pediatric Rheumatology, Seattle Children's Hospital, Department of Pediatrics, University of Washington, Seattle, WA; Center for Clinical and Translational Research, Seattle Children's Research Institute, Seattle, WA; Department of Radiology, Seattle Children's Hospital, Seattle, WA; Department of Radiology, University of Washington, Seattle, WA; Department of Statistics, School of Nursing, University of Washington, Seattle, WA. Corresponding author: Yongdong Zhao, MD, PhD MA 7.110, 4800 Sand Point Way NE, Seattle, WA 98105
| | - Nivrutti Bhide
- Pediatric Rheumatology, Seattle Children's Hospital, Department of Pediatrics, University of Washington, Seattle, WA; Center for Clinical and Translational Research, Seattle Children's Research Institute, Seattle, WA; Department of Radiology, Seattle Children's Hospital, Seattle, WA; Department of Radiology, University of Washington, Seattle, WA; Department of Statistics, School of Nursing, University of Washington, Seattle, WA. Corresponding author: Yongdong Zhao, MD, PhD MA 7.110, 4800 Sand Point Way NE, Seattle, WA 98105
| | - Joshua Scheck
- Pediatric Rheumatology, Seattle Children's Hospital, Department of Pediatrics, University of Washington, Seattle, WA; Center for Clinical and Translational Research, Seattle Children's Research Institute, Seattle, WA; Department of Radiology, Seattle Children's Hospital, Seattle, WA; Department of Radiology, University of Washington, Seattle, WA; Department of Statistics, School of Nursing, University of Washington, Seattle, WA. Corresponding author: Yongdong Zhao, MD, PhD MA 7.110, 4800 Sand Point Way NE, Seattle, WA 98105
| | - Kevin Cain
- Pediatric Rheumatology, Seattle Children's Hospital, Department of Pediatrics, University of Washington, Seattle, WA; Center for Clinical and Translational Research, Seattle Children's Research Institute, Seattle, WA; Department of Radiology, Seattle Children's Hospital, Seattle, WA; Department of Radiology, University of Washington, Seattle, WA; Department of Statistics, School of Nursing, University of Washington, Seattle, WA. Corresponding author: Yongdong Zhao, MD, PhD MA 7.110, 4800 Sand Point Way NE, Seattle, WA 98105
| | - Savannah C Partridge
- Pediatric Rheumatology, Seattle Children's Hospital, Department of Pediatrics, University of Washington, Seattle, WA; Center for Clinical and Translational Research, Seattle Children's Research Institute, Seattle, WA; Department of Radiology, Seattle Children's Hospital, Seattle, WA; Department of Radiology, University of Washington, Seattle, WA; Department of Statistics, School of Nursing, University of Washington, Seattle, WA. Corresponding author: Yongdong Zhao, MD, PhD MA 7.110, 4800 Sand Point Way NE, Seattle, WA 98105
| | - Carol A Wallace
- Pediatric Rheumatology, Seattle Children's Hospital, Department of Pediatrics, University of Washington, Seattle, WA; Center for Clinical and Translational Research, Seattle Children's Research Institute, Seattle, WA; Department of Radiology, Seattle Children's Hospital, Seattle, WA; Department of Radiology, University of Washington, Seattle, WA; Department of Statistics, School of Nursing, University of Washington, Seattle, WA. Corresponding author: Yongdong Zhao, MD, PhD MA 7.110, 4800 Sand Point Way NE, Seattle, WA 98105
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Shi X, Lim Y, Myers AK, Stallings BL, Mccoy A, Zeiger J, Scheck J, Cho G, Marsh ED, Mirzaa GM, Tao T, Golden JA. PIK3R2/Pik3r2 Activating Mutations Result in Brain Overgrowth and EEG Changes. Ann Neurol 2020; 88:1077-1094. [PMID: 32856318 PMCID: PMC8176885 DOI: 10.1002/ana.25890] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/16/2020] [Revised: 08/23/2020] [Accepted: 08/24/2020] [Indexed: 01/23/2023]
Abstract
OBJECTIVE Mutations in phosphatidylinositol-4,5-bisphosphate 3-kinase (PI3K) complex have been associated with a broad spectrum of brain and organ overgrowth syndromes. For example, mutations in phosphatidylinositol-3-kinase regulatory subunit 2 (PIK3R2) have been identified in human patients with megalencephaly polymicrogyria polydactyly hydrocephalus (MPPH) syndrome, which includes brain overgrowth. To better understand the pathogenesis of PIK3R2-related mutations, we have developed and characterized a murine model. METHODS We generated a knock-in mouse model for the most common human PIK3R2 mutation, p.G373R (p.G367R in mice) using CRISPR/Cas9. The mouse phenotypes, including brain size, seizure activity, cortical lamination, cell proliferation/size/density, interneuron migration, and PI3K pathway activation, were analyzed using standard methodologies. For human patients with PIK3R2 mutations, clinical data (occipitofrontal circumference [OFC] and epilepsy) were retrospectively obtained from our clinical records (published / unpublished). RESULTS The PI3K-AKT pathway was hyperactivated in these mice, confirming the p.G367R mutation is an activating mutation in vivo. Similar to human patients with PIK3R2 mutations, these mice have enlarged brains. We found cell size to be increased but not cell numbers. The embryonic brain showed mild defects in cortical lamination, although not observed in the mature brain. Furthermore, electroencephalogram (EEG) recordings from mutant mice showed background slowing and rare seizures, again similar to our observations in human patients. INTERPRETATION We have generated a PIK3R2 mouse model that exhibits megalencephaly and EEG changes, both of which overlap with human patients. Our data provide novel insight into the pathogenesis of the human disease caused by PIK3R2 p.G373R mutation. We anticipate this model will be valuable in testing therapeutic options for human patients with MPPH. ANN NEUROL 2020;88:1077-1094.
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Affiliation(s)
- Xiuyu Shi
- State Key Laboratory of Stress Cell Biology, School of Life Sciences, Xiamen University, Xiamen, Fujian, 361005, China
- Department of Pathology, Brigham and Women’s Hospital, Harvard Medical School, Boston, MA 02115, USA
| | - Youngshin Lim
- Department of Pathology, Brigham and Women’s Hospital, Harvard Medical School, Boston, MA 02115, USA
| | - Abigail K. Myers
- Department of Pathology, Brigham and Women’s Hospital, Harvard Medical School, Boston, MA 02115, USA
| | - Brenna L. Stallings
- Department of Pathology, Brigham and Women’s Hospital, Harvard Medical School, Boston, MA 02115, USA
| | - Almedia Mccoy
- Departments of Neurology and Pediatrics, Division of Child Neurology, Children’s Hospital of Philadelphia, University of Pennsylvania Perelman School of Medicine, Philadelphia, PA 19104, USA
| | - Jordan Zeiger
- Center for Integrative Brain Research, Seattle Children’s Research Institute, Seattle, WA 98101, USA
| | - Joshua Scheck
- Center for Integrative Brain Research, Seattle Children’s Research Institute, Seattle, WA 98101, USA
| | - Ginam Cho
- Department of Pathology, Brigham and Women’s Hospital, Harvard Medical School, Boston, MA 02115, USA
| | - Eric D. Marsh
- Departments of Neurology and Pediatrics, Division of Child Neurology, Children’s Hospital of Philadelphia, University of Pennsylvania Perelman School of Medicine, Philadelphia, PA 19104, USA
| | - Ghayda M. Mirzaa
- Center for Integrative Brain Research, Seattle Children’s Research Institute, Seattle, WA 98101, USA
- Department of Pediatrics, University of Washington, Seattle, WA 98195, USA
- Brotman Baty Institute for Precision Medicine, Seattle, WA 98195, USA
| | - Tao Tao
- State Key Laboratory of Stress Cell Biology, School of Life Sciences, Xiamen University, Xiamen, Fujian, 361005, China
| | - Jeffrey A. Golden
- Department of Pathology, Brigham and Women’s Hospital, Harvard Medical School, Boston, MA 02115, USA
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7
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Mirzaa GM, Chong JX, Piton A, Popp B, Foss K, Guo H, Harripaul R, Xia K, Scheck J, Aldinger KA, Sajan SA, Tang S, Bonneau D, Beck A, White J, Mahida S, Harris J, Smith-Hicks C, Hoyer J, Zweier C, Reis A, Thiel CT, Jamra RA, Zeid N, Yang A, Farach LS, Walsh L, Payne K, Rohena L, Velinov M, Ziegler A, Schaefer E, Gatinois V, Geneviève D, Simon MEH, Kohler J, Rotenberg J, Wheeler P, Larson A, Ernst ME, Akman CI, Westman R, Blanchet P, Schillaci LA, Vincent-Delorme C, Gripp KW, Mattioli F, Guyader GL, Gerard B, Mathieu-Dramard M, Morin G, Sasanfar R, Ayub M, Vasli N, Yang S, Person R, Monaghan KG, Nickerson DA, van Binsbergen E, Enns GM, Dries AM, Rowe LJ, Tsai ACH, Svihovec S, Friedman J, Agha Z, Qamar R, Rodan LH, Martinez-Agosto J, Ockeloen CW, Vincent M, Sunderland WJ, Bernstein JA, Eichler EE, Vincent JB, Bamshad MJ. De novo and inherited variants in ZNF292 underlie a neurodevelopmental disorder with features of autism spectrum disorder. Genet Med 2019; 22:538-546. [PMID: 31723249 PMCID: PMC7060121 DOI: 10.1038/s41436-019-0693-9] [Citation(s) in RCA: 20] [Impact Index Per Article: 4.0] [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: 07/16/2019] [Revised: 10/22/2019] [Accepted: 10/23/2019] [Indexed: 11/09/2022] Open
Abstract
PURPOSE Intellectual disability (ID) and autism spectrum disorder (ASD) are genetically heterogeneous neurodevelopmental disorders. We sought to delineate the clinical, molecular, and neuroimaging spectrum of a novel neurodevelopmental disorder caused by variants in the zinc finger protein 292 gene (ZNF292). METHODS We ascertained a cohort of 28 families with ID due to putatively pathogenic ZNF292 variants that were identified via targeted and exome sequencing. Available data were analyzed to characterize the canonical phenotype and examine genotype-phenotype relationships. RESULTS Probands presented with ID as well as a spectrum of neurodevelopmental features including ASD, among others. All ZNF292 variants were de novo, except in one family with dominant inheritance. ZNF292 encodes a highly conserved zinc finger protein that acts as a transcription factor and is highly expressed in the developing human brain supporting its critical role in neurodevelopment. CONCLUSION De novo and dominantly inherited variants in ZNF292 are associated with a range of neurodevelopmental features including ID and ASD. The clinical spectrum is broad, and most individuals present with mild to moderate ID with or without other syndromic features. Our results suggest that variants in ZNF292 are likely a recurrent cause of a neurodevelopmental disorder manifesting as ID with or without ASD.
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Affiliation(s)
- Ghayda M Mirzaa
- Center for Integrative Brain Research, Seattle Children's Research Institute, Seattle, WA, USA. .,Division of Genetic Medicine, Department of Pediatrics, University of Washington School of Medicine, Seattle, WA, USA. .,Brotman Baty Institute for Precision Medicine, Seattle, Washington, USA.
| | - Jessica X Chong
- Division of Genetic Medicine, Department of Pediatrics, University of Washington School of Medicine, Seattle, WA, USA.,Brotman Baty Institute for Precision Medicine, Seattle, Washington, USA
| | - Amélie Piton
- Molecular Genetic Unit, Strasbourg University Hospital, Strasbourg, France.,Institute of Genetics and Molecular and Cellular Biology, Université de Strasbourg, Illkirch, France
| | - Bernt Popp
- Institute of Human Genetics, University Hospital Elrangen, Friedrich-Alexander-Universität (FAU) Erlangen-Nürnberg, Erlangen, Germany
| | - Kimberly Foss
- Center for Integrative Brain Research, Seattle Children's Research Institute, Seattle, WA, USA
| | - Hui Guo
- Center for Medical Genetics & Hunan Key Laboratory of Medical Genetics, School of Life Sciences, Central South University, Changsha, Hunan, China
| | - Ricardo Harripaul
- The Campbell Family Mental Health Research Institute, Centre for Addiction & Mental Health (CAMH), Toronto, ON, Canada.,Institute of Medical Science, University of Toronto, Toronto, ON, Canada
| | - Kun Xia
- Center for Medical Genetics & Hunan Key Laboratory of Medical Genetics, School of Life Sciences, Central South University, Changsha, Hunan, China
| | - Joshua Scheck
- Center for Integrative Brain Research, Seattle Children's Research Institute, Seattle, WA, USA
| | - Kimberly A Aldinger
- Center for Integrative Brain Research, Seattle Children's Research Institute, Seattle, WA, USA
| | - Samin A Sajan
- Department of Clinical Genomics, Ambry Genetics, Aliso Viejo, CA, USA
| | - Sha Tang
- WuXi NextCODE, Cambridge, MA, USA
| | - Dominique Bonneau
- Département de Biochimie et de Génétique, CHU d'Angers, Angers, France.,UMR INSERM 1083 CNRS 6015, Angers, France
| | - Anita Beck
- Division of Genetic Medicine, Department of Pediatrics, University of Washington School of Medicine, Seattle, WA, USA
| | - Janson White
- Department of Genome Sciences, University of Washington School of Medicine, Seattle, WA, USA
| | - Sonal Mahida
- Department of Neurogenetics, Kennedy Krieger Institute, Baltimore, MD, USA
| | - Jacqueline Harris
- Department of Neurogenetics, Kennedy Krieger Institute, Baltimore, MD, USA
| | | | - Juliane Hoyer
- Institute of Human Genetics, University Hospital Elrangen, Friedrich-Alexander-Universität (FAU) Erlangen-Nürnberg, Erlangen, Germany
| | - Christiane Zweier
- Institute of Human Genetics, University Hospital Elrangen, Friedrich-Alexander-Universität (FAU) Erlangen-Nürnberg, Erlangen, Germany
| | - André Reis
- Institute of Human Genetics, University Hospital Elrangen, Friedrich-Alexander-Universität (FAU) Erlangen-Nürnberg, Erlangen, Germany
| | - Christian T Thiel
- Institute of Human Genetics, University Hospital Elrangen, Friedrich-Alexander-Universität (FAU) Erlangen-Nürnberg, Erlangen, Germany
| | - Rami Abou Jamra
- Institute of Human Genetics, University Medical Center Leipzig, Leipzig, Germany
| | | | - Amy Yang
- Department of Molecular and Medical Genetics, Oregon Health and Science University, Portland, OR, USA
| | - Laura S Farach
- Department of Pediatrics, McGovern Medical School at the University of Texas Health Sciences Center, Houston, TX, USA
| | - Laurence Walsh
- Indiana University Health at Riley Hospital for Children, Indianapolis, IN, USA
| | - Katelyn Payne
- Indiana University Health at Riley Hospital for Children, Indianapolis, IN, USA
| | - Luis Rohena
- Division of Genetics, Department of Pediatrics, San Antonio Military Medical Center, San Antonio, TX, USA.,Department of Pediatrics, University of Texas Health Science Center at San Antonio, San Antonio, TX, USA
| | - Milen Velinov
- New York State Institute for Basic Research in Developmental Disability, NY, Staten Island, USA
| | - Alban Ziegler
- Département de Biochimie et de Génétique, CHU d'Angers, Angers, France.,Service de Génétique Médicale, Centre hospitalier, Le Mans, France
| | - Elise Schaefer
- Service de Génétique Médicale, Hôpitaux Universitaires de Strasbourg, Institut de Génétique Médicale d'Alsace, Strasbourg, France
| | - Vincent Gatinois
- Service de génétique clinique, Département de Génétique Médicale, Maladies Rares et Médecine Personnalisée, Strasbourg, France.,Centre de Référence Maladies Rares Anomalies du Développement et Syndromes Malformatifs Sud-Ouest Occitanie Réunion, Hôpital Arnaud de Villeneuve, Montpellier, France.,Université Montpellier, Unité Inserm U1183, Montpellier, France
| | - David Geneviève
- Service de génétique clinique, Département de Génétique Médicale, Maladies Rares et Médecine Personnalisée, Strasbourg, France.,Centre de Référence Maladies Rares Anomalies du Développement et Syndromes Malformatifs Sud-Ouest Occitanie Réunion, Hôpital Arnaud de Villeneuve, Montpellier, France.,Université Montpellier, Unité Inserm U1183, Montpellier, France
| | - Marleen E H Simon
- Department of Genetics, University Medical Center Utrecht, Utrecht, The Netherlands
| | - Jennefer Kohler
- Stanford Center for Undiagnosed Diseases, Stanford University, Stanford, CA, USA
| | | | | | - Austin Larson
- Section of Genetics, Department of Pediatrics, University of Colorado School of Medicine and Children's Hospital Colorado, Aurora, CO, USA
| | - Michelle E Ernst
- Institute for Genomic Medicine, Columbia University Irving Medical Center, New York, NY, USA
| | - Cigdem I Akman
- Institute for Genomic Medicine, Columbia University Irving Medical Center, New York, NY, USA.,Division of Pediatric Neurology, Columbia University Irving Medical Center, New York, NY, USA
| | | | - Patricia Blanchet
- Centre de Référence Maladies Rares Anomalies du Développement et Syndromes Malformatifs Sud-Ouest Occitanie Réunion, Hôpital Arnaud de Villeneuve, Montpellier, France
| | - Lori-Anne Schillaci
- Department of Genetics and Genome Sciences, Case Western Reserve University, University Hospitals Cleveland Medical Center, Cleveland, OH, USA
| | - Catherine Vincent-Delorme
- Service de Génétique Clinique Guy Fontaine Centre de référence maladies rares Anomalies du dévelopement, Hôpital Jeanne de Flandre Lille, Lille, France
| | - Karen W Gripp
- Department of Pediatrics, AI duPont Hospital, DE, Wilmington, USA
| | - Francesca Mattioli
- Institut de Genetique et de Biologie Moleculaire et Cellulaire, Illkirch-Graffenstaden, Lille, France
| | - Gwenaël Le Guyader
- Service de Génétique Clinique, Centre de compétence Maladies rares Anomalies du dévelopement, CHU de Poitiers, Poitiers, France
| | - Bénédicte Gerard
- Molecular Genetic Unit, Strasbourg University Hospital, Strasbourg, France
| | - Michèle Mathieu-Dramard
- Service de Génétique Clinique Centre de référence maladies rares Anomalies du dévelopement, CHU Amiens-Picardie, Amiens, France
| | - Gilles Morin
- Children's Medical Center, UMass Memorial Medical Center, Worcester, MA, USA
| | - Roksana Sasanfar
- Children's Medical Center, UMass Memorial Medical Center, Worcester, MA, USA
| | - Muhammad Ayub
- Department of Psychiatry, Queen's University, Kingston, ON, Canada
| | - Nasim Vasli
- Division of Clinical & Metabolic Genetics, Hospital for Sick Children, Toronto, ON, Canada
| | | | | | | | - Deborah A Nickerson
- Department of Genome Sciences, University of Washington School of Medicine, Seattle, WA, USA
| | - Ellen van Binsbergen
- Department of Genetics, University Medical Center Utrecht, Utrecht, The Netherlands
| | - Gregory M Enns
- Stanford Center for Undiagnosed Diseases, Stanford University, Stanford, CA, USA.,Division of Medical Genetics, Department of Pediatrics, Lucile Packard Children's Hospital, Stanford University, Stanford, CA, USA
| | - Annika M Dries
- Stanford Center for Undiagnosed Diseases, Stanford University, Stanford, CA, USA
| | - Leah J Rowe
- Section of Genetics, Department of Pediatrics, University of Colorado School of Medicine and Children's Hospital Colorado, Aurora, CO, USA
| | - Anne C H Tsai
- Section of Genetics, Department of Pediatrics, University of Colorado School of Medicine and Children's Hospital Colorado, Aurora, CO, USA
| | - Shayna Svihovec
- Section of Genetics, Department of Pediatrics, University of Colorado School of Medicine and Children's Hospital Colorado, Aurora, CO, USA
| | - Jennifer Friedman
- Departments of Neurosciences and Pediatrics, University of California San Diego and Division of Neurology, Rady Children's Hospital, San Diego, CA, USA.,Rady Children's Institute for Genomic Medicine, San Diego, CA, USA
| | - Zehra Agha
- Department of Biosciences, COMSATS University, Islamabad, Pakistan
| | - Raheel Qamar
- Department of Biosciences, COMSATS University, Islamabad, Pakistan
| | - Lance H Rodan
- Division of Genetics and Genomics, Boston Children's Hospital, Harvard Medical School, Boston, MA, USA.,Department of Neurology, Boston Children's Hospital, Harvard Medical School, Boston, MA, USA
| | | | - Charlotte W Ockeloen
- Department of Human Genetics, Radboud University Medical Center, Nijmegen, The Netherlands
| | - Marie Vincent
- CHU de Nantes, Service de génétique médicale, Nantes, France
| | | | - Jonathan A Bernstein
- Stanford Center for Undiagnosed Diseases, Stanford University, Stanford, CA, USA.,Division of Medical Genetics, Department of Pediatrics, Lucile Packard Children's Hospital, Stanford University, Stanford, CA, USA
| | | | - Evan E Eichler
- Department of Genome Sciences, University of Washington School of Medicine, Seattle, WA, USA.,Howard Hughes Medical Institute, University of Washington, Seattle, WA, USA
| | - John B Vincent
- The Campbell Family Mental Health Research Institute, Centre for Addiction & Mental Health (CAMH), Toronto, ON, Canada.,Institute of Medical Science, University of Toronto, Toronto, ON, Canada
| | | | - Michael J Bamshad
- Division of Genetic Medicine, Department of Pediatrics, University of Washington School of Medicine, Seattle, WA, USA.,Brotman Baty Institute for Precision Medicine, Seattle, Washington, USA
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Isfort P, Pedersoli F, Liebl M, Zimmermann M, Schulze-Hagen M, Scheck J, Kuhl C, Bruners P. Bildmorphologische Unterschiede nach irreversibler Elektroporation und Radiofrequenzablation im Follow-up mittels Mehrphasen-CT. ROFO-FORTSCHR RONTG 2017. [DOI: 10.1055/s-0037-1600278] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
Affiliation(s)
- P Isfort
- Universitätsklinikum RWTH Aachen, Klinik für Diagnostische und Interventionelle Radiologie, Aachen
| | - F Pedersoli
- Universitätsklinikum RWTH Aachen, Klinik für Diagnostische und Interventionelle Radiologie, Aachen
| | - M Liebl
- Universitätsklinikum RWTH Aachen, Klinik für Diagnostische und Interventionelle Radiologie, Aachen
| | - M Zimmermann
- Universitätsklinikum RWTH Aachen, Klinik für Diagnostische und Interventionelle Radiologie, Aachen
| | - M Schulze-Hagen
- Universitätsklinikum RWTH Aachen, Klinik für Diagnostische und Interventionelle Radiologie, Aachen
| | - J Scheck
- Universitätsklinikum RWTH Aachen, Klinik für Diagnostische und Interventionelle Radiologie, Aachen
| | - C Kuhl
- Universitätsklinikum RWTH Aachen, Klinik für Diagnostische und Interventionelle Radiologie, Aachen
| | - P Bruners
- Universitätsklinikum RWTH Aachen, Klinik für Diagnostische und Interventionelle Radiologie, Aachen
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Scheck J, Drechsler M, Ma X, Stöckl MT, Konsek J, Schwaderer JB, Stadler SM, De Yoreo JJ, Gebauer D. Polyaspartic acid facilitates oxolation within iron(iii) oxide pre-nucleation clusters and drives the formation of organic-inorganic composites. J Chem Phys 2016; 145:211917. [PMID: 28799341 DOI: 10.1063/1.4963738] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022] Open
Abstract
The interplay between polymers and inorganic minerals during the formation of solids is crucial for biomineralization and bio-inspired materials, and advanced material properties can be achieved with organic-inorganic composites. By studying the reaction mechanisms, basic questions on organic-inorganic interactions and their role during material formation can be answered, enabling more target-oriented strategies in future synthetic approaches. Here, we present a comprehensive study on the hydrolysis of iron(iii) in the presence of polyaspartic acid. For the basic investigation of the formation mechanism, a titration assay was used, complemented by microscopic techniques. The polymer is shown to promote precipitation in partly hydrolyzed reaction solutions at the very early stages of the reaction by facilitating iron(iii) hydrolysis. In unhydrolyzed solutions, no significant interactions between the polymer and the inorganic solutes can be observed. We demonstrate that the hydrolysis promotion by the polymer can be understood by facilitating oxolation in olation iron(iii) pre-nucleation clusters. We propose that the adsorption of olation pre-nucleation clusters on the polymer chains and the resulting loss in dynamics and increased proximity of the reactants is the key to this effect. The resulting composite material obtained from the hydrolysis in the presence of the polymer was investigated with additional analytical techniques, namely, scanning and transmission electron microscopies, light microscopy, atomic force microscopy, zeta potential measurements, dynamic light scattering, and thermogravimetric analyses. It consists of elastic, polydisperse nanospheres, ca. 50-200 nm in diameter, and aggregates thereof, exhibiting a high polymer and water content.
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Affiliation(s)
- J Scheck
- Department of Chemistry, University of Konstanz, Universitätsstr. 10, Konstanz 78457, Germany
| | - M Drechsler
- Laboratory for Soft Matter Electron Microscopy, BIMF, University of Bayreuth, Universitätsstr. 30, 95440 Bayreuth, Germany
| | - X Ma
- Department of Chemistry, Idaho State University, Pocatello, Idaho 83201, USA
| | - M T Stöckl
- Bioimaging Center, University of Konstanz, Universitätsstr. 10, Konstanz 78457, Germany
| | - J Konsek
- Department of Chemistry, University of Konstanz, Universitätsstr. 10, Konstanz 78457, Germany
| | - J B Schwaderer
- Department of Chemistry, University of Konstanz, Universitätsstr. 10, Konstanz 78457, Germany
| | - S M Stadler
- Department of Chemistry, University of Konstanz, Universitätsstr. 10, Konstanz 78457, Germany
| | - J J De Yoreo
- Physical Sciences Division, Pacific Northwest National Laboratory, Richland, Washington 99352, USA
| | - D Gebauer
- Department of Chemistry, University of Konstanz, Universitätsstr. 10, Konstanz 78457, Germany
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10
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Scheck J, Lewis LA, Lane TJ. A model program for assisting pet owners infected with human immunodeficiency virus. J Am Vet Med Assoc 1996; 208:483-4. [PMID: 8603891] [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] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/31/2023]
Affiliation(s)
- J Scheck
- College of Veterinary Medicine, University of Florida, Gainesville 32610, USA
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Scheck J. More on professional image. J Am Vet Med Assoc 1992; 200:759-60. [PMID: 1568920] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
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Abstract
Fecal examinations revealed that at least 10 of 21 (48%) captive red wolves (Canis rufus) and eight of 12 (67%) free-ranging red wolves were infected with intestinal parasites. No captive wolves and only one of seven reintroduced wolves had dirofilariasis. Ticks were collected from 10 of 21 (48%) captive wolves and nine of 12 (75%) free-ranging animals. Ivermectin administered at a dosage of 50 micrograms/kg of estimated body weight every 30 to 60 days apparently prevented or ameliorated parasitism in red wolves.
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Affiliation(s)
- M K Phillips
- Alligator River National Wildlife Refuge, United States Fish and Wildlife Service, Manteo, North Carolina 27954
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Scheck J, Spencer H, Lewin I, Samachson J. Mineral and protein losses during starvation. J Am Diet Assoc 1966; 49:211-4. [PMID: 5921145] [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: 01/17/2023]
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Spencer H, Scheck J, Lewin I, Samachson J. Comparative absorption of calcium from calcium gluconate and calcium lactate in man. J Nutr 1966; 89:283-92. [PMID: 4288031 DOI: 10.1093/jn/89.3.283] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023] Open
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