1
|
Zheleznyak A, Tang R, Duncan K, Manion B, Liang K, Xu B, Vanover A, Ghai A, Prior J, Lees S, Achilefu S, Kelly K, Shokeen M. Development of New CD38 Targeted Peptides for Cancer Imaging. Mol Imaging Biol 2024:10.1007/s11307-024-01901-5. [PMID: 38480650 DOI: 10.1007/s11307-024-01901-5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/05/2023] [Revised: 02/15/2024] [Accepted: 02/20/2024] [Indexed: 04/18/2024]
Abstract
PURPOSE Multiple myeloma (MM) affects over 35,000 patients each year in the US. There remains a need for versatile Positron Emission Tomography (PET) tracers for the detection, accurate staging, and monitoring of treatment response of MM that have optimal specificity and translational attributes. CD38 is uniformly overexpressed in MM and thus represents an ideal target to develop CD38-targeted small molecule PET radiopharmaceuticals to address these challenges. PROCEDURES Using phage display peptide libraries and pioneering algorithms, we identified novel CD38 specific peptides. Imaging bioconjugates were synthesized using solid phase peptide chemistry, and systematically analyzed in vitro and in vivo in relevant MM systems. RESULTS The CD38-targeted bioconjugates were radiolabeled with copper-64 (64Cu) with100% radiochemical purity and an average specific activity of 3.3 - 6.6 MBq/nmol. The analog NODAGA-PEG4-SL022-GGS (SL022: Thr-His-Tyr-Pro-Ile-Val-Ile) had a Kd of 7.55 ± 0.291 nM and was chosen as the lead candidate. 64Cu-NODAGA-PEG4-SL022-GGS demonstrated high binding affinity to CD38 expressing human myeloma MM.1S-CBR-GFP-WT cells, which was blocked by the non-radiolabeled version of the peptide analog and anti-CD38 clinical antibodies, daratumumab and isatuximab, by 58%, 73%, and 78%, respectively. The CD38 positive MM.1S-CBR-GFP-WT cells had > 68% enhanced cellular binding when compared to MM.1S-CBR-GFP-KO cells devoid of CD38. Furthermore, our new CD38-targeted radiopharmaceutical allowed visualization of tumors located in marrow rich bones, remaining there for up to 4 h. Clearance from non-target organs occurred within 60 min. Quantitative PET data from a murine disseminated tumor model showed significantly higher accumulation in the bones of tumor-bearing animals compared to tumor-naïve animals (SUVmax 2.06 ± 0.4 versus 1.24 ± 0.4, P = 0.02). Independently, tumor uptake of the target compound was significantly higher (P = 0.003) compared to the scrambled peptide, 64Cu-NODAGA-PEG4-SL041-GGS (SL041: Thr-Tyr-His-Ile-Pro-Ile-Val). The subcutaneous MM model demonstrated significantly higher accumulation in tumors compared to muscle at 1 and 4 h after tracer administration (SUVmax 0.8 ± 0.2 and 0.14 ± 0.04, P = 0.04 at 1 h; SUVmax 0.89 ± 0.01 and 0.09 ± 0.01, P = 0.0002 at 4 h). CONCLUSIONS The novel CD38-targeted, radiolabeled bioconjugates were specific and allowed visualization of MM, providing a starting point for the clinical translation of such tracers for the detection of MM.
Collapse
Affiliation(s)
- Alexander Zheleznyak
- Department of Radiology, Washington University School of Medicine, St. Louis, MO, 63110, USA
| | - Rui Tang
- Department of Radiology, Washington University School of Medicine, St. Louis, MO, 63110, USA
| | - Kathleen Duncan
- Department of Radiology, Washington University School of Medicine, St. Louis, MO, 63110, USA
| | - Brad Manion
- Department of Radiology, Washington University School of Medicine, St. Louis, MO, 63110, USA
| | - Kexian Liang
- Department of Radiology, Washington University School of Medicine, St. Louis, MO, 63110, USA
| | - Baogang Xu
- Department of Neurosurgery, Washington University School of Medicine, St. Louis, MO, 63110, USA
| | - Alexander Vanover
- Department of Radiology, Washington University School of Medicine, St. Louis, MO, 63110, USA
| | - Anchal Ghai
- Department of Biomedical Engineering, UT Southwestern Medical Center, Dallas, TX, 75390, USA
| | - Julie Prior
- Department of Radiology, Washington University School of Medicine, St. Louis, MO, 63110, USA
| | - Stephen Lees
- Department of Biomedical Engineering, University of Virginia, Charlottesville, VA, 22908, USA
| | - Samuel Achilefu
- Department of Biomedical Engineering, UT Southwestern Medical Center, Dallas, TX, 75390, USA
| | - Kimberly Kelly
- Department of Biomedical Engineering, University of Virginia, Charlottesville, VA, 22908, USA
| | - Monica Shokeen
- Department of Radiology, Washington University School of Medicine, St. Louis, MO, 63110, USA.
- Alvin J. Siteman Cancer Center, Washington University School of Medicine and Barnes-Jewish Hospital, St. Louis, MO, 63110, USA.
- Department of Biomedical Engineering, Washington University in St. Louis, St. Louis, MO, 63110, USA.
- Department of Medicine, Washington University School of Medicine, St. Louis, MO, USA.
| |
Collapse
|
2
|
Egbulefu C, Black K, Su X, Karmakar P, Habimana-Griffin L, Sudlow G, Prior J, Chukwu E, Zheleznyak A, Xu B, Xu Y, Esser A, Mixdorf M, Moss E, Manion B, Reed N, Gubin M, Lin CY, Schreiber R, Weilbaecher K, Achilefu S. Induction of complementary immunogenic necroptosis and apoptosis cell death pathways inhibits cancer metastasis and relapse. Res Sq 2024:rs.3.rs-3992212. [PMID: 38558990 PMCID: PMC10980095 DOI: 10.21203/rs.3.rs-3992212/v1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/04/2024]
Abstract
Interactions of light-sensitive drugs and materials with Cerenkov radiation-emitting radiopharmaceuticals generate cytotoxic reactive oxygen species (ROS) to inhibit localized and disseminated cancer progression, but the cell death mechanisms underlying this radionuclide stimulated dynamic therapy (RaST) remain elusive. Using ROS-regenerative nanophotosensitizers coated with a tumor-targeting transferrin-titanocene complex (TiO2-TC-Tf) and radiolabeled 2-fluorodeoxyglucose (18FDG), we found that adherent dying cells maintained metabolic activity with increased membrane permeabilization. Mechanistic assessment of these cells revealed that RaST activated the expression of RIPK-1 and RIPK-3, which mediate necroptosis cell death. Subsequent recruitment of the nuclear factors kappa B and the executioner mixed lineage kinase domain-like pseudo kinase (MLKL) triggered plasma membrane permeabilization and pore formation, respectively, followed by the release of cytokines and immunogenic damage-associated molecular patterns (DAMPs). In immune-deficient breast cancer models with adequate stroma and growth factors that recapitulate the human tumor microenvironment, RaST failed to inhibit tumor progression and the ensuing lung metastasis. A similar aggressive tumor model in immunocompetent mice responded to RaST, achieving a remarkable partial response (PR) and complete response (CR) with no evidence of lung metastasis, suggesting active immune system engagement. RaST recruited antitumor CD11b+, CD11c+, and CD8b+ effector immune cells after initiating dual immunogenic apoptosis and necroptosis cell death pathways in responding tumors in vivo. Over time, cancer cells upregulated the expression of negative immune regulating cytokine (TGF-β) and soluble immune checkpoints (sICP) to challenge RaST effect in the CR mice. Using a signal-amplifying cancer-imaging agent, LS301, we identified latent minimal residual disseminated tumors in the lymph nodes (LNs) of the CR group. Despite increased protumor immunogens in the CR mice, RaST prevented cancer relapse and metastasis through dynamic redistribution of ROS-regenerative TiO2 from bones at the early treatment stage to the spleen and LNs, maintaining active immunity against cancer progression and migration. This study reveals the immune-mechanistic underpinnings of RaST-mediated antitumor immune response and highlights immunogenic reprogramming of tumors in response to RaST. Overcoming apoptosis resistance through complementary necroptosis activation paves the way for strategic drug combinations to improve cancer treatment.
Collapse
Affiliation(s)
- Christopher Egbulefu
- Department of Radiology, Washington University in St. Louis, MO 63110, USA
- Department of Biomedical Engineering, The University of Texas Southwestern Medical Center, Dallas, TX 75235-9397, USA
| | - Kvar Black
- Department of Radiology, Washington University in St. Louis, MO 63110, USA
| | - Xinming Su
- Department of Medicine, Washington University in St. Louis, MO 63110, USA
| | - Partha Karmakar
- Department of Radiology, Washington University in St. Louis, MO 63110, USA
| | | | - Gail Sudlow
- Department of Radiology, Washington University in St. Louis, MO 63110, USA
| | - Julie Prior
- Department of Radiology, Washington University in St. Louis, MO 63110, USA
| | - Ezeugo Chukwu
- Department of Radiology, Washington University in St. Louis, MO 63110, USA
| | - Alex Zheleznyak
- Department of Radiology, Washington University in St. Louis, MO 63110, USA
| | - Baogang Xu
- Department of Radiology, Washington University in St. Louis, MO 63110, USA
| | - Yalin Xu
- Department of Radiology, Washington University in St. Louis, MO 63110, USA
| | - Alison Esser
- Department of Medicine, Washington University in St. Louis, MO 63110, USA
| | - Matthew Mixdorf
- Department of Radiology, Washington University in St. Louis, MO 63110, USA
| | - Evan Moss
- Department of Radiology, Washington University in St. Louis, MO 63110, USA
| | - Brad Manion
- Department of Radiology, Washington University in St. Louis, MO 63110, USA
| | - Nathan Reed
- Department of Radiology, Washington University in St. Louis, MO 63110, USA
| | - Matthew Gubin
- Department of Pathology and Immunology, Washington University in St. Louis, MO 63110, USA
| | - Chieh-Yu Lin
- Department of Pathology and Immunology, Washington University in St. Louis, MO 63110, USA
| | - Robert Schreiber
- Department of Pathology and Immunology, Washington University in St. Louis, MO 63110, USA
| | | | - Samuel Achilefu
- Department of Radiology, Washington University in St. Louis, MO 63110, USA
- Department of Medicine, Washington University in St. Louis, MO 63110, USA
- Department of Biomedical Engineering, Washington University in St. Louis, MO 63110, USA
- Department of Biomedical Engineering, The University of Texas Southwestern Medical Center, Dallas, TX 75235-9397, USA
| |
Collapse
|
3
|
Malone C, Zheleznyak A, Tang R, Duncan K, Prior J, Black K, Egbulefu C, Sullentrup R, Shokeen M, Achilefu S. Abstract No. 81 Assessing Novel Nano-Photosensitizer Hepatocellular Carcinoma (HCC) Tumor Uptake in Vivo as a Candidate Platform to Enhance 90Y Radioembolization. J Vasc Interv Radiol 2023. [DOI: 10.1016/j.jvir.2022.12.127] [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: 02/27/2023] Open
|
4
|
Kim S, Lim S, Kim B, Ritchey J, Vij K, Prior J, Marsala L, Stoner A, Gao F, Achilefu S, Cooper ML, DiPersio JF, Choi J. S100A9 upregulated by IFNGR signaling blockade functions as a novel GVHD suppressor without compromising GVL in mice. Blood 2023; 141:945-950. [PMID: 36477272 PMCID: PMC10023737 DOI: 10.1182/blood.2021012687] [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] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/28/2021] [Revised: 11/03/2022] [Accepted: 11/23/2022] [Indexed: 12/12/2022] Open
Abstract
Allogeneic hematopoietic stem cell transplantation (allo-HSCT) is a curative treatment for both malignant and nonmalignant hematologic disorders. However, graft-versus-host disease (GVHD) and malignant relapse limit its therapeutic success. We previously demonstrated that the blockade of interferon-gamma receptor (IFNGR) signaling in donor T cells resulted in a reduction in GVHD while preserving graft-versus-leukemia (GVL) effects. However, the underlying molecular mechanisms remain inconclusive. In this study, we found that S100A9 is a novel GVHD suppressor upregulated when IFNGR is blocked in T cells. Both Ifngr1-/- and S100a9-overexpressing T cells significantly reduced GVHD without compromising GVL, altering donor T-cell trafficking to GVHD target organs in our mouse model of allo-HSCT. In addition, in vivo administration of recombinant murine S100A9 proteins prolongs the overall survival of recipient mice. Furthermore, in vivo administration of anti-human IFNGRα neutralizing antibody (αhGR-Nab) significantly upregulates the expression of S100A9 in human T cells and improved GVHD in our mouse model of xenogeneic human peripheral blood mononuclear cell transplantation. Consistent with S100a9-overexpressing T cells in our allo-HSCT model, αhGR-Nab reduced human T-cell trafficking to the GVHD target organs. Taken together, S100A9, a downstream molecule suppressed by IFNGR signaling, functions as a novel GVHD suppressor without compromising GVL.
Collapse
Affiliation(s)
- Sena Kim
- Division of Oncology, Department of Medicine, Washington University School of Medicine, St. Louis, MO
| | - Sora Lim
- Division of Oncology, Department of Medicine, Washington University School of Medicine, St. Louis, MO
| | - Boram Kim
- Division of Oncology, Department of Medicine, Washington University School of Medicine, St. Louis, MO
| | - Julie Ritchey
- Division of Oncology, Department of Medicine, Washington University School of Medicine, St. Louis, MO
| | - Kiran Vij
- Division of Oncology, Department of Medicine, Washington University School of Medicine, St. Louis, MO
| | - Julie Prior
- Molecular Imaging Center in the Mallinckrodt Institute of Radiology, Washington University School of Medicine, St. Louis, MO
| | - Lynne Marsala
- Molecular Imaging Center in the Mallinckrodt Institute of Radiology, Washington University School of Medicine, St. Louis, MO
| | - Alyssa Stoner
- Division of Oncology, Department of Medicine, Washington University School of Medicine, St. Louis, MO
| | - Feng Gao
- Division of Public Health Sciences, Department of Surgery, Washington University School of Medicine, St. Louis, MO
| | - Samuel Achilefu
- Molecular Imaging Center in the Mallinckrodt Institute of Radiology, Washington University School of Medicine, St. Louis, MO
| | - Matthew L. Cooper
- Division of Oncology, Department of Medicine, Washington University School of Medicine, St. Louis, MO
| | - John F. DiPersio
- Division of Oncology, Department of Medicine, Washington University School of Medicine, St. Louis, MO
| | - Jaebok Choi
- Division of Oncology, Department of Medicine, Washington University School of Medicine, St. Louis, MO
| |
Collapse
|
5
|
Zheleznyak A, Mixdorf M, Marsala L, Prior J, Yang X, Cui G, Xu B, Fletcher S, Fontana F, Lanza G, Achilefu S. Orthogonal targeting of osteoclasts and myeloma cells for radionuclide stimulated dynamic therapy induces multidimensional cell death pathways. Theranostics 2021; 11:7735-7754. [PMID: 34335961 PMCID: PMC8315072 DOI: 10.7150/thno.60757] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/22/2021] [Accepted: 06/09/2021] [Indexed: 12/13/2022] Open
Abstract
Rationale: Multiple myeloma (MM) is a multifocal malignancy of bone marrow plasma cells, characterized by vicious cycles of remission and relapse that eventually culminate in death. The disease remains mostly incurable largely due to the complex interactions between the bone microenvironment (BME) and MM cells (MMC). In the “vicious cycle” of bone disease, abnormal activation of osteoclasts (OCs) by MMC causes severe osteolysis, promotes immune evasion, and stimulates the growth of MMC. Disrupting these cancer-stroma interactions would enhance treatment response. Methods: To disrupt this cycle, we orthogonally targeted nanomicelles (NM) loaded with non-therapeutic doses of a photosensitizer, titanocene (TC), to VLA-4 (α4ß1, CD49d/CD29) expressing MMC (MM1.S) and αvß3 (CD51/CD61) expressing OC. Concurrently, a non-lethal dose of a radiopharmaceutical, 18F-fluorodeoxyglucose ([18F]FDG) administered systemically interacted with TC (radionuclide stimulated therapy, RaST) to generate cytotoxic reactive oxygen species (ROS). The in vitro and in vivo effects of RaST were characterized in MM1.S cell line, as well as in xenograft and isograft MM animal models. Results: Our data revealed that RaST induced non-enzymatic hydroperoxidation of cellular lipids culminating in mitochondrial dysfunction, DNA fragmentation, and caspase-dependent apoptosis of MMC using VLA-4 avid TC-NMs. RaST upregulated the expression of BAX, Bcl-2, and p53, highlighting the induction of apoptosis via the BAK-independent pathway. The enhancement of multicopper oxidase enzyme F5 expression, which inhibits lipid hydroperoxidation and Fenton reaction, was not sufficient to overcome RaST-induced increase in the accumulation of irreversible function-perturbing α,ß-aldehydes that exerted significant and long-lasting damage to both DNA and proteins. In vivo, either VLA-4-TC-NM or αvß3-TC-NMs RaST induced a significant therapeutic effect on immunocompromised but not immunocompetent MM-bearing mouse models. Combined treatment with both VLA-4-TC-NM and αvß3-TC-NMs synergistically inhibited osteolysis, reduced tumor burden, and prevented rapid relapse in both in vivo models of MM. Conclusions: By targeting MM and bone cells simultaneously, combination RaST suppressed MM disease progression through a multi-prong action on the vicious cycle of bone cancer. Instead of using the standard multidrug approach, our work reveals a unique photophysical treatment paradigm that uses nontoxic doses of a single light-sensitive drug directed orthogonally to cancer and bone cells, followed by radionuclide-stimulated generation of ROS to inhibit tumor progression and minimize osteolysis in both immunocompetent murine and immunocompromised human MM models.
Collapse
|
6
|
Cerrillo J, Oviedo Casado S, Prior J. Low Field Nano-NMR via Three-Level System Control. Phys Rev Lett 2021; 126:220402. [PMID: 34152193 DOI: 10.1103/physrevlett.126.220402] [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] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/06/2020] [Accepted: 04/20/2021] [Indexed: 06/13/2023]
Abstract
Conventional control strategies for nitrogen-vacancy centers in quantum sensing are based on a two-level model of their triplet ground state. However, this approach fails in regimes of weak bias magnetic fields or strong microwave pulses, as we demonstrate. To overcome this limitation, we propose a novel control sequence that exploits all three levels by addressing a hidden Raman configuration with microwave pulses tuned to the zero-field transition. We report excellent performance in typical dynamical decoupling sequences, opening up the possibility for nano-NMR operation in low field environments.
Collapse
Affiliation(s)
- J Cerrillo
- Área de Física Aplicada, Universidad Politécnica de Cartagena, Cartagena E-30202, Spain
| | - S Oviedo Casado
- Racah Institute of Physics, The Hebrew University of Jerusalem, Jerusalem 91904, Givat Ram, Israel
| | - J Prior
- Área de Física Aplicada, Universidad Politécnica de Cartagena, Cartagena E-30202, Spain
- Departamento de Física-CIOyN, Universidad de Murcia, Murcia E-30071, Spain
- Instituto Carlos I de Física teórica y Computacional, Universidad de Granada, Granada E-18071, Spain
| |
Collapse
|
7
|
Prior J. Understanding how young people perceive acne and acne treatments. Br J Dermatol 2020; 183:208-209. [DOI: 10.1111/bjd.18954] [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: 11/29/2022]
Affiliation(s)
- J. Prior
- Kingston University Kingston upon Thames KT1 1LQ UK
| |
Collapse
|
8
|
Tang R, Zheleznyak A, Mixdorf M, Ghai A, Prior J, Black KCL, Shokeen M, Reed N, Biswas P, Achilefu S. Osteotropic Radiolabeled Nanophotosensitizer for Imaging and Treating Multiple Myeloma. ACS Nano 2020; 14:4255-4264. [PMID: 32223222 PMCID: PMC7295119 DOI: 10.1021/acsnano.9b09618] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
Rapid liver and spleen opsonization of systemically administered nanoparticles (NPs) for in vivo applications remains the Achilles' heel of nanomedicine, allowing only a small fraction of the materials to reach the intended target tissue. Although focusing on diseases that reside in the natural disposal organs for nanoparticles is a viable option, it limits the plurality of lesions that could benefit from nanomedical interventions. Here we designed a theranostic nanoplatform consisting of reactive oxygen (ROS)-generating titanium dioxide (TiO2) NPs, coated with a tumor-targeting agent, transferrin (Tf), and radiolabeled with a radionuclide (89Zr) for targeting bone marrow, imaging the distribution of the NPs, and stimulating ROS generation for cell killing. Radiolabeling of TiO2 NPs with 89Zr afforded thermodynamically and kinetically stable chelate-free 89Zr-TiO2-Tf NPs without altering the NP morphology. Treatment of multiple myeloma (MM) cells, a disease of plasma cells originating in the bone marrow, with 89Zr-TiO2-Tf generated cytotoxic ROS to induce cancer cell killing via the apoptosis pathway. Positron emission tomography/X-ray computed tomography (PET/CT) imaging and tissue biodistribution studies revealed that in vivo administration of 89Zr-TiO2-Tf in mice leveraged the osteotropic effect of 89Zr to selectively localize about 70% of the injected radioactivity in mouse bone tissue. A combination of small-animal PET/CT imaging of NP distribution and bioluminescence imaging of cancer progression showed that a single-dose 89Zr-TiO2-Tf treatment in a disseminated MM mouse model completely inhibited cancer growth at euthanasia of untreated mice and at least doubled the survival of treated mice. Treatment of the mice with cold Zr-TiO2-Tf, 89Zr-oxalate, or 89Zr-Tf had no therapeutic benefit compared to untreated controls. This study reveals an effective radionuclide sensitizing nanophototherapy paradigm for the treatment of MM and possibly other bone-associated malignancies.
Collapse
Affiliation(s)
- Rui Tang
- Department of Radiology, Washington University School of Medicine, St. Louis, MO, 63110, USA
| | - Alexander Zheleznyak
- Department of Radiology, Washington University School of Medicine, St. Louis, MO, 63110, USA
| | - Matthew Mixdorf
- Department of Radiology, Washington University School of Medicine, St. Louis, MO, 63110, USA
| | - Anchal Ghai
- Department of Radiology, Washington University School of Medicine, St. Louis, MO, 63110, USA
| | - Julie Prior
- Department of Radiology, Washington University School of Medicine, St. Louis, MO, 63110, USA
| | - Kvar C. L. Black
- Department of Radiology, Washington University School of Medicine, St. Louis, MO, 63110, USA
| | - Monica Shokeen
- Department of Radiology, Washington University School of Medicine, St. Louis, MO, 63110, USA
- Department of Biomedical Engineering, Washington University in St. Louis, St. Louis, MO, 63105, USA
| | - Nathan Reed
- Department of Energy, Environmental and Chemical Engineering, Washington University in St. Louis, St. Louis, MO, 63112, USA
| | - Pratim Biswas
- Department of Energy, Environmental and Chemical Engineering, Washington University in St. Louis, St. Louis, MO, 63112, USA
| | - Samuel Achilefu
- Department of Radiology, Washington University School of Medicine, St. Louis, MO, 63110, USA
- Department of Biomedical Engineering, Washington University in St. Louis, St. Louis, MO, 63105, USA
- Departments of Medicine and Biochemistry & Molecular Biophysics, Washington University School of Medicine, St. Louis, MO, 63110, USA
| |
Collapse
|
9
|
Habimana-Griffin L, Ye D, Carpenter J, Prior J, Sudlow G, Marsala L, Mixdorf M, Rubin JB, Chen H, Achilefu S. Intracranial glioma xenograft model rapidly reestablishes blood-brain barrier integrity for longitudinal imaging of tumor progression using fluorescence molecular tomography and contrast agents. J Biomed Opt 2020; 25:1-13. [PMID: 32112540 PMCID: PMC7047009 DOI: 10.1117/1.jbo.25.2.026004] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 10/18/2019] [Accepted: 01/27/2020] [Indexed: 06/10/2023]
Abstract
SIGNIFICANCE The blood-brain barrier (BBB) is a major obstacle to detecting and treating brain tumors. Overcoming this challenge will facilitate the early and accurate detection of brain lesions and guide surgical resection of tumors. AIM We generated an orthotopic brain tumor model that simulates the pathophysiology of gliomas at early stages; determine the BBB integrity and breakdown over the time course of tumor progression using generic and cancer-targeted near-infrared (NIR) fluorescent molecular probes. APPROACH We developed an intracranial tumor xenograft model that rapidly reestablished BBB integrity and monitored tumor progression by bioluminescence imaging. Sham control mice were injected with phosphate-buffered saline only. Fluorescence molecular tomography (FMT) was used to quantify the uptake of tumor-targeted and passive NIR fluorescent imaging agents in orthotopic glioma (U87-GL-GFP PDE7B H217Q cells) tumor model. Cancer-induced and transient (with focused ultrasound, FUS) disruption of BBB integrity was monitored with NIR fluorescent dyes. RESULTS Stereotactic injection of 50,000 cells into mouse brain allowed rapid reestablishment of BBB integrity within a week, as determined by the inability of both tumor-targeted and generic NIR imaging agents to extravasate into the brain. Tumor-induced BBB disruption was observed 7 weeks after tumor implantation. FUS achieved a similar effect at any time point after reestablishing BBB integrity. While tumor uptake and retention of the passive NIR dye, indocyanine green, was negligible, both actively tumor-targeting agents exhibited selective accumulation in the tumor region. The tumor-targeting molecular probe that clears rapidly from nontumor brain tissue exhibits higher contrast than the analogous vascular-targeting agent and helps delineate tumors from sham control. CONCLUSIONS We highlight the utility of FMT imaging for longitudinal assessment of brain tumors and the interplay between the stages of BBB disruption and molecular probe retention in tumors, with potential application to other neurological diseases.
Collapse
Affiliation(s)
- LeMoyne Habimana-Griffin
- Washington University School of Medicine, Department of Radiology, St. Louis, Missouri, United States
- Washington University, Department of Biomedical Engineering, St. Louis, Missouri, United States
| | - Dezhuang Ye
- Washington University, Department of Mechanical Engineering and Materials Science, St. Louis, Missouri, United States
| | - Julia Carpenter
- Washington University School of Medicine, Department of Radiology, St. Louis, Missouri, United States
| | - Julie Prior
- Washington University School of Medicine, Department of Radiology, St. Louis, Missouri, United States
| | - Gail Sudlow
- Washington University School of Medicine, Department of Radiology, St. Louis, Missouri, United States
| | - Lynne Marsala
- Washington University School of Medicine, Department of Radiology, St. Louis, Missouri, United States
| | - Matthew Mixdorf
- Washington University School of Medicine, Department of Radiology, St. Louis, Missouri, United States
| | - Joshua B. Rubin
- Washington University School of Medicine, Department of Pediatrics, St. Louis, Missouri, United States
| | - Hong Chen
- Washington University, Department of Biomedical Engineering, St. Louis, Missouri, United States
- Washington University School of Medicine, Department of Radiation Oncology, St. Louis, Missouri, United States
| | - Samuel Achilefu
- Washington University School of Medicine, Department of Radiology, St. Louis, Missouri, United States
- Washington University, Department of Biomedical Engineering, St. Louis, Missouri, United States
- Washington University School of Medicine, Department of Biochemistry and Molecular Biophysics, St. Louis, Missouri, United States
| |
Collapse
|
10
|
Tavana S, Clark JN, Prior J, Baxan N, Masouros SD, Newell N, Hansen U. Quantifying deformations and strains in human intervertebral discs using Digital Volume Correlation combined with MRI (DVC-MRI). J Biomech 2020; 102:109604. [PMID: 31928737 DOI: 10.1016/j.jbiomech.2020.109604] [Citation(s) in RCA: 18] [Impact Index Per Article: 4.5] [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: 07/31/2019] [Revised: 12/19/2019] [Accepted: 12/31/2019] [Indexed: 02/02/2023]
Abstract
Physical disruptions to intervertebral discs (IVDs) can cause mechanical changes that lead to degeneration and to low back pain which affects 75% of us in our lifetimes. Quantifying the effects of these changes on internal IVD strains may lead to better preventative strategies and treatments. Digital Volume Correlation (DVC) is a non-invasive technique that divides volumetric images into subsets, and measures strains by tracking the internal patterns within them under load. Applying DVC to MRIs may allow non-invasive strain measurements. However, DVC-MRI for strain measurements in IVDs has not been used previously. The purpose of this study was to quantify the strain and deformation errors associated with DVC-MRI for measurements in human IVDs. Eight human lumbar IVDs were MRI scanned (9.4 T) for a 'zero-strain study' (multiple unloaded scans to quantify noise within the system), and a loaded study (2 mm axial compression). Three DVC methodologies: Fast-Fourier transform (FFT), direct correlation (DC), and a combination of both FFT and DC approaches were compared with subset sizes ranging from 8 to 88 voxels to establish the optimal DVC methodology and settings which were then used in the loaded study. FFT + DC was the optimal method and a subset size of 56 voxels (2520 µm) was found to be a good compromise between errors and spatial resolution. Displacement and strain errors did not exceed 28 µm and 3000 microstrain, respectively. These findings demonstrate that DVC-MRI can quantify internal strains within IVDs non-invasively and accurately. The method has unique potential for assessing IVD strains within patients.
Collapse
Affiliation(s)
- S Tavana
- Department of Mechanical Engineering, Imperial College London, UK
| | - J N Clark
- Department of Mechanical Engineering, Imperial College London, UK
| | - J Prior
- Department of Bioengineering, Imperial College London, UK
| | - N Baxan
- Biomedical Imaging Centre, Department of Medicine, Imperial College London, UK
| | - S D Masouros
- Department of Bioengineering, Imperial College London, UK
| | - N Newell
- Department of Mechanical Engineering, Imperial College London, UK.
| | - U Hansen
- Department of Mechanical Engineering, Imperial College London, UK
| |
Collapse
|
11
|
Cho H, Jammalamadaka U, Tappa K, Egbulefu C, Prior J, Tang R, Achilefu S. 3D Printing of Poloxamer 407 Nanogel Discs and Their Applications in Adjuvant Ovarian Cancer Therapy. Mol Pharm 2019; 16:552-560. [PMID: 30608705 DOI: 10.1021/acs.molpharmaceut.8b00836] [Citation(s) in RCA: 27] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
Abstract
Nanogels are attractive biocompatible materials that enable local delivery of multiple drugs. In this study, we demonstrated that 3D printing technology could be used to precisely construct nanogel discs carrying paclitaxel and rapamycin. 3D-printed nanogel disc rounds (12 mm diameter × 1 mm thickness) carrying paclitaxel and rapamycin evaded premature gelation during storage and the initial burst release of the drugs in the dissolution medium. In vivo 3D-printed nanogel discs permitted successful intraperitoneal delivery of paclitaxel and rapamycin in ES-2-luc ovarian-cancer-bearing xenograft mice. They were also shown to be therapeutically effective and capable of preventing postsurgical peritoneal adhesions in the treated xenograft mice.
Collapse
Affiliation(s)
- Hyunah Cho
- School of Pharmacy and Heath Sciences , Fairleigh Dickinson University , Florham Park , New Jersey 07932 , United States
| | - Udayabhanu Jammalamadaka
- Mallinckrodt Institute of Radiology , Washington University School of Medicine , St. Louis , Missouri 63110 , United States
| | - Karthik Tappa
- Mallinckrodt Institute of Radiology , Washington University School of Medicine , St. Louis , Missouri 63110 , United States
| | - Christopher Egbulefu
- Mallinckrodt Institute of Radiology , Washington University School of Medicine , St. Louis , Missouri 63110 , United States
| | - Julie Prior
- Mallinckrodt Institute of Radiology , Washington University School of Medicine , St. Louis , Missouri 63110 , United States
| | - Rui Tang
- Mallinckrodt Institute of Radiology , Washington University School of Medicine , St. Louis , Missouri 63110 , United States
| | - Samuel Achilefu
- Mallinckrodt Institute of Radiology , Washington University School of Medicine , St. Louis , Missouri 63110 , United States
| |
Collapse
|
12
|
Porretta AP, Van-Der-Gucht A, Saguner AM, Park CI, Bisch L, Schlaepfer J, Pascale P, Le Bloa M, Buss G, Ribi CI, Prior J, Pruvot E. P1605High occurrence of sustained ventricular tachycardia despite immunosuppressive treatment in cardiac sarcoidosis. Eur Heart J 2018. [DOI: 10.1093/eurheartj/ehy565.p1605] [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] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Affiliation(s)
- A P Porretta
- University Hospital Centre Vaudois (CHUV), Lausanne, Switzerland
| | - A Van-Der-Gucht
- University Hospital Centre Vaudois (CHUV), Lausanne, Switzerland
| | - A M Saguner
- University Heart Center, Department of Cardiology, Zurich, Switzerland
| | - C I Park
- Hôpital De La Tour, Meyrin, Switzerland
| | - L Bisch
- University Hospital Centre Vaudois (CHUV), Lausanne, Switzerland
| | - J Schlaepfer
- University Hospital Centre Vaudois (CHUV), Lausanne, Switzerland
| | - P Pascale
- University Hospital Centre Vaudois (CHUV), Lausanne, Switzerland
| | - M Le Bloa
- University Hospital Centre Vaudois (CHUV), Lausanne, Switzerland
| | - G Buss
- University Hospital Centre Vaudois (CHUV), Lausanne, Switzerland
| | - C I Ribi
- University Hospital Centre Vaudois (CHUV), Lausanne, Switzerland
| | - J Prior
- University Hospital Centre Vaudois (CHUV), Lausanne, Switzerland
| | - E Pruvot
- University Hospital Centre Vaudois (CHUV), Lausanne, Switzerland
| |
Collapse
|
13
|
Miller J, Wang ST, Orukari I, Prior J, Sudlow G, Su X, Liang K, Tang R, Hillman EM, Weilbaecher KN, Culver JP, Berezin MY, Achilefu S. Perfusion-based fluorescence imaging method delineates diverse organs and identifies multifocal tumors using generic near-infrared molecular probes. J Biophotonics 2018; 11:e201700232. [PMID: 29206348 PMCID: PMC5903995 DOI: 10.1002/jbio.201700232] [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] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/17/2017] [Revised: 11/03/2017] [Accepted: 12/03/2017] [Indexed: 06/07/2023]
Abstract
Rapid detection of multifocal cancer without the use of complex imaging schemes will improve treatment outcomes. In this study, dynamic fluorescence imaging was used to harness differences in the perfusion kinetics of near-infrared (NIR) fluorescent dyes to visualize structural characteristics of different tissues. Using the hydrophobic nontumor-selective NIR dye cypate, and the hydrophilic dye LS288, a high tumor-to-background contrast was achieved, allowing the delineation of diverse tissue types while maintaining short imaging times. By clustering tissue types with similar perfusion properties, the dynamic fluorescence imaging method identified secondary tumor locations when only the primary tumor position was known, with a respective sensitivity and specificity of 0.97 and 0.75 for cypate, and 0.85 and 0.81 for LS288. Histological analysis suggests that the vasculature in the connective tissue that directly surrounds the tumor was a major factor for tumor identification through perfusion imaging. Although the hydrophobic dye showed higher specificity than the hydrophilic probe, use of other dyes with different physical and biological properties could further improve the accuracy of the dynamic imaging platform to identify multifocal tumors for potential use in real-time intraoperative procedures.
Collapse
Affiliation(s)
- Jessica Miller
- Optical Radiology Lab, Mallinckrodt Institute of Radiology, Washington University School of Medicine, 4515 McKinley Ave, St. Louis, Missouri 63110, United States
- Biomedical Engineering, Washington University in St. Louis, 1 Brookings Dr., St. Louis, Missouri 63130, United States
| | - Steven T. Wang
- Optical Radiology Lab, Mallinckrodt Institute of Radiology, Washington University School of Medicine, 4515 McKinley Ave, St. Louis, Missouri 63110, United States
| | - Inema Orukari
- Optical Radiology Lab, Mallinckrodt Institute of Radiology, Washington University School of Medicine, 4515 McKinley Ave, St. Louis, Missouri 63110, United States
- Biomedical Engineering, Washington University in St. Louis, 1 Brookings Dr., St. Louis, Missouri 63130, United States
| | - Julie Prior
- Optical Radiology Lab, Mallinckrodt Institute of Radiology, Washington University School of Medicine, 4515 McKinley Ave, St. Louis, Missouri 63110, United States
| | - Gail Sudlow
- Optical Radiology Lab, Mallinckrodt Institute of Radiology, Washington University School of Medicine, 4515 McKinley Ave, St. Louis, Missouri 63110, United States
| | - Xinming Su
- Department of Medicine, Division of Oncology, Washington University School of Medicine, St. Louis, Missouri, United States
| | - Kexian Liang
- Optical Radiology Lab, Mallinckrodt Institute of Radiology, Washington University School of Medicine, 4515 McKinley Ave, St. Louis, Missouri 63110, United States
| | - Rui Tang
- Optical Radiology Lab, Mallinckrodt Institute of Radiology, Washington University School of Medicine, 4515 McKinley Ave, St. Louis, Missouri 63110, United States
| | - Elizabeth M.C. Hillman
- Department of Biomedical Engineering, Columbia University, 1210 Amsterdam Ave., New York, NY 10027, United States
| | - Katherine N. Weilbaecher
- Department of Medicine, Division of Oncology, Washington University School of Medicine, St. Louis, Missouri, United States
| | - Joseph P. Culver
- Optical Radiology Lab, Mallinckrodt Institute of Radiology, Washington University School of Medicine, 4515 McKinley Ave, St. Louis, Missouri 63110, United States
- Biomedical Engineering, Washington University in St. Louis, 1 Brookings Dr., St. Louis, Missouri 63130, United States
| | - Mikhail Y. Berezin
- Optical Radiology Lab, Mallinckrodt Institute of Radiology, Washington University School of Medicine, 4515 McKinley Ave, St. Louis, Missouri 63110, United States
- Department of Chemistry, Washington University, St. Louis, Missouri 63132, United States
| | - Samuel Achilefu
- Optical Radiology Lab, Mallinckrodt Institute of Radiology, Washington University School of Medicine, 4515 McKinley Ave, St. Louis, Missouri 63110, United States
- Biomedical Engineering, Washington University in St. Louis, 1 Brookings Dr., St. Louis, Missouri 63130, United States
- Department of Biochemistry and Molecular Biophysics, Washington University School of Medicine, St. Louis, Missouri 63110, United States
| |
Collapse
|
14
|
Oviedo-Casado S, Urbina A, Prior J. Publisher Correction: Magnetic field enhancement of organic photovoltaic cells performance. Sci Rep 2018. [PMID: 29535390 PMCID: PMC5848024 DOI: 10.1038/s41598-018-21980-z] [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] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022] Open
Affiliation(s)
- S Oviedo-Casado
- Departamento de Física Aplicada, Universidad Politécnica de Cartagena, Cartagena, 30202, Spain
| | - A Urbina
- Departamento de Electrónica, Universidad Politécnica de Cartagena, Cartagena, 30202, Spain
| | - J Prior
- Departamento de Física Aplicada, Universidad Politécnica de Cartagena, Cartagena, 30202, Spain.
| |
Collapse
|
15
|
Castelli J, Depeursinge A, Nditifei-Ndoh V, Devillers A, Dicente Y, Schaer R, Prior J, Bourhis J, Sire C, de Crevoisier R. Valeur de la tomographie par émission de positons au ( 18 F)-fluorodésoxyglucose pour prédire la récidive dans les cancers ORL non oropharyngé pris en charge par chimioradiothérapie. Cancer Radiother 2017. [DOI: 10.1016/j.canrad.2017.08.006] [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]
|
16
|
Scher N, Herrera F, Ozsahin M, Prior J, Depeursinge A, Bourhis J, Castelli J. Nouveaux paramètres métaboliques de la tomographie par émission de positons–scanographie au fluorodésoxyglucose pour prédire la récidive et la survie des cancers du col utérin pris en charge par chimioradiothérapie. Cancer Radiother 2017. [DOI: 10.1016/j.canrad.2017.07.015] [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]
|
17
|
Prior J. Qualitative study of online discussion forums about acne. Br J Dermatol 2017; 177:616. [PMID: 28940278 DOI: 10.1111/bjd.15761] [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: 11/30/2022]
Affiliation(s)
- J Prior
- School of Behavioural Sciences, Kingston University, Penrhyn Road, Kingston-Upon-Thames, KT1 2EE, U.K
| |
Collapse
|
18
|
Porretta A, Park CI, Di Bernardo S, Bisch L, Schlaepfer J, Pascale P, Le Bloa M, Buss G, Prior J, Pruvot E. P1605Focal hypermetabolic left ventricular cardiomyopathy: a new arrhythmogenic clinical entity? Eur Heart J 2017. [DOI: 10.1093/eurheartj/ehx502.p1605] [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] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
|
19
|
Abstract
Charge separation is a critical process for achieving high efficiencies in organic photovoltaic cells. The initial tightly bound excitonic electron-hole pair has to dissociate fast enough in order to avoid photocurrent generation and thus power conversion efficiency loss via geminate recombination. Such process takes place assisted by transitional states that lie between the initial exciton and the free charge state. Due to spin conservation rules these intermediate charge transfer states typically have singlet character. Here we propose a donor-acceptor model for a generic organic photovoltaic cell in which the process of charge separation is modulated by a magnetic field which tunes the energy levels. The impact of a magnetic field is to intensify the generation of charge transfer states with triplet character via inter-system crossing. As the ground state of the system has singlet character, triplet states are recombination-protected, thus leading to a higher probability of successful charge separation. Using the open quantum systems formalism we demonstrate that the population of triplet charge transfer states grows in the presence of a magnetic field, and discuss the impact on carrier population and hence photocurrent, highlighting its potential as a tool for research on charge transfer kinetics in this complex systems.
Collapse
Affiliation(s)
- S Oviedo-Casado
- Departamento de Física Aplicada, Universidad Politécnica de Cartagena, Cartagena, 30202, Spain
| | - A Urbina
- Departamento de Electrónica, Universidad Politécnica de Cartagena, Cartagena, 30202, Spain
| | - J Prior
- Departamento de Física Aplicada, Universidad Politécnica de Cartagena, Cartagena, 30202, Spain.
| |
Collapse
|
20
|
Scher N, Herrera F, Depeursinge A, Breuneval T, Bourhis J, Prior J, Ozsahin M, Castelli J. PO-0718: 18-FDG PET/CT parameters to predict survival and recurrence in cervical cancer. Radiother Oncol 2017. [DOI: 10.1016/s0167-8140(17)31155-6] [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]
|
21
|
De Bari B, Breuneval T, Zeverino M, Godin S, Deantonio L, Prior J, Bourhis J, Moeckli R, Ozsahin M. PO-0683: Impact of the radiation dose on hepatic perfusion evaluated using mebrofenin liver scintigraphy. Radiother Oncol 2017. [DOI: 10.1016/s0167-8140(17)31120-9] [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]
|
22
|
Castelli J, De Bari B, Depeursinge A, Simon A, Devillers A, Roman Jimenez G, Prior J, Ozsahin M, de Crevoisier R, Bourhis J. Overview of the predictive value of quantitative 18 FDG PET in head and neck cancer treated with chemoradiotherapy. Crit Rev Oncol Hematol 2016; 108:40-51. [PMID: 27931839 DOI: 10.1016/j.critrevonc.2016.10.009] [Citation(s) in RCA: 41] [Impact Index Per Article: 5.1] [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: 06/27/2016] [Revised: 10/08/2016] [Accepted: 10/26/2016] [Indexed: 02/03/2023] Open
Abstract
18 F-fluorodeoxyglucose (18F-FDG) positron emission tomography/computed tomography (PET/CT) allows to quantify the metabolic activity of a tumor (glycolysis) and has become a reference tool in oncology for the staging, restaging, radiotherapy planning and monitoring response in many cancers. Quantitative analyses have been introduced in order to overcome some of the limits of the visual methods, allowing an easier and more objective comparison of the inter- and intra-patients variations. The aims of this review were to report available evidences on the clinical value of quantitative PET/CT parameters in HNC. Forty-five studies, for a total of 2928 patients, were analyzed. Most of the data available dealt with the intensity of the metabolism, calculated from the Standard Uptake Value (SUV). Metabolic Tumor Volume (MTV) was well correlated with overall survival and disease free survival, with a higher predictive value than the maximum SUV. Spatial distribution of metabolism and textural analyses seems promising.
Collapse
Affiliation(s)
- J Castelli
- Radiotherapy Department, CHUV, Lausanne, Switzerland; INSERM, U1099, Rennes, F-35000, France; Université de Rennes 1, LTSI, Rennes, F-35000, France.
| | - B De Bari
- Radiotherapy Department, CHUV, Lausanne, Switzerland
| | - A Depeursinge
- University of Applied Sciences Western Switzerland, 3960 Sierre, Switzerland; Ecole Polytechnique Fédérale de Lausanne, CH-1015 Lausanne VD, Switzerland
| | - A Simon
- INSERM, U1099, Rennes, F-35000, France; Université de Rennes 1, LTSI, Rennes, F-35000, France
| | - A Devillers
- Nuclear Medecine Department, Centre Eugene Marquis, Rennes, F-35000, France
| | - G Roman Jimenez
- INSERM, U1099, Rennes, F-35000, France; Université de Rennes 1, LTSI, Rennes, F-35000, France; Keosys Medical imaging, 1 Impasse Augustin Fresnel, Saint-Herblain, F-44815, France
| | - J Prior
- Nuclear Medecine Department, CHUV, Switzerland
| | - M Ozsahin
- Radiotherapy Department, CHUV, Lausanne, Switzerland
| | - R de Crevoisier
- INSERM, U1099, Rennes, F-35000, France; Université de Rennes 1, LTSI, Rennes, F-35000, France; Radiotherapy Department, Centre Eugene Marquis, Rennes, F-35000, France
| | - J Bourhis
- Radiotherapy Department, CHUV, Lausanne, Switzerland
| |
Collapse
|
23
|
Godin S, Ozsahin M, Zeverino M, Breuneval T, Prior J, Bourhis J, Moeckli R, De Bari B. Impact de la dose de radiothérapie sur la perfusion pulmonaire évaluée à l’aide de la scintigraphie pulmonaire. Cancer Radiother 2016. [DOI: 10.1016/j.canrad.2016.08.035] [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: 11/25/2022]
|
24
|
Breuneval T, Ozsahin M, Zeverino M, Godin S, Prior J, Bourhis J, Moeckli R, De Bari B. Impact de la dose de radiothérapie sur la perfusion hépatique évalué à l’aide de la scintigraphie hépatique à la mébrofénine. Cancer Radiother 2016. [DOI: 10.1016/j.canrad.2016.08.048] [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: 11/15/2022]
|
25
|
Peguret N, Ozsahin M, Beigelman C, Zeverino M, Durham A, Duclos F, Grant K, Belmondo B, Simons J, Long O, Moeckli R, Prior J, Meuli R, Bourhis J. OC-0138: Apnea-like suppression of respiratory motion: first clinical evaluation. Radiother Oncol 2016. [DOI: 10.1016/s0167-8140(16)31387-1] [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: 11/28/2022]
|
26
|
Chatal JF, Perkins AC, Baum RP, Bischof Delaloye A, Prior J, Signore A. The long history of the International Research Group in Immuno-Scintigraphy and Therapy (IRIST). Q J Nucl Med Mol Imaging 2015; 59:137-139. [PMID: 25864529] [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: 06/04/2023]
Affiliation(s)
- J F Chatal
- Groupement d'Intérêt Public Arronax, Saint‑Herblain, France
| | | | | | | | | | | |
Collapse
|
27
|
Porta L, De Bari B, Cerny M, Pomoni A, Schmidt S, Prior J, Bourhis J, Ozsahin M. EP-1216: Changes in preoperative 18FDG-PET/CT after neoadjuvant treatments and pathological response in rectal cancer. Radiother Oncol 2015. [DOI: 10.1016/s0167-8140(15)41208-3] [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]
|
28
|
Dahmane A, van Griensven J, Van Herp M, Van den Bergh R, Nzomukunda Y, Prior J, Alders P, Jambai A, Zachariah R. Constraints in the diagnosis and treatment of Lassa Fever and the effect on mortality in hospitalized children and women with obstetric conditions in a rural district hospital in Sierra Leone. Trans R Soc Trop Med Hyg 2014; 108:126-32. [PMID: 24535150 DOI: 10.1093/trstmh/tru009] [Citation(s) in RCA: 37] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
BACKGROUND Lassa fever (LF) is an acute viral haemorrhagic infection, endemic in West Africa. Confirmatory diagnosis and treatment (ribavirin) is difficult, expensive, and restricted to specialised hospitals. Among confirmed and suspected LF cases, we report on clinical and laboratory features, timing and administration of ribavirin and the relationship with case fatality. METHODS We conducted an audit of patient files of suspected LF cases admitted to a pediatric and obstetric referral hospital in rural Sierra Leone (April 2011 to February 2012). RESULTS There were 84 suspected LF cases; 36 (43%) were laboratory-confirmed cases, of whom only 20 (56%) received ribavirin after a median duration of eight days (IQR 314 days) of hospital admission. Of 16 patients who did not receive ribavirin, 14 (87%) died before ribavirin treatment could be commenced. Starting ribavirin within six days of admission was associated with a case fatality of 29% (2/7), while starting ribavirin later than six days was associated with a case fatality of 50% (6/12). Among the 48 suspected LF cases without laboratory confirmation, there were 21 (44%) deaths. CONCLUSIONS These findings highlight shortcomings in LF management, including diagnostic and treatment delays. More research and development efforts should be devoted to this 'neglected disease'.
Collapse
Affiliation(s)
- A Dahmane
- Médecins Sans Frontières, Medical Department (Operational Research), Brussels Operational Center, Brussels, Belgium
| | | | | | | | | | | | | | | | | |
Collapse
|
29
|
Montemurro M, Cioffi A, Domont J, Rutkowski P, Roth A, von Moos R, Inauen R, Bui B, Burkhard R, Knuesli C, Bauer S, Cassier P, Schwarb H, Le Cesne A, Koeberle D, Baertschi D, Dietrich D, Biaggi C, Prior J, Leyvraz S. Long-Term Outcome of Dasatinib First-Line Treatment in Gastrointestinal Stromal Tumors: a Multicenter Two Stage Phase Ii Trial Sakk 56/07. Ann Oncol 2014. [DOI: 10.1093/annonc/mdu354.7] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
|
30
|
Cristina V, Pracht M, Lachenal Y, Adib S, Boubaker A, Prior J, Senys A, Wagner AD, Bize P. [Interventional radiology procedures for malignancies of the liver treatment: Intraarterial procedures]. Rev Med Suisse 2014; 10:1130-1135. [PMID: 24941686] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
Intraarterial procedures such as chemoembolization and radioembolization aim for the palliative treatment of advanced hepatocellular carcinoma (stage BCLC B and C with tumoral portal thrombosis). The combination of hepatic intraarterial chemotherapy and systemic chemotherapy can increase the probability of curing colorectal cancer with hepatic metastases not immediately accessible to surgical treatment or percutaneous ablation.
Collapse
|
31
|
Moura C, Bernatsky S, Abrahamowicz M, Papaioannou A, Bessette L, Adachi J, Goltzman D, Prior J, Kreiger N, Towheed T, Leslie WD, Kaiser S, Ioannidis G, Pickard L, Fraser LA, Rahme E. Antidepressant use and 10-year incident fracture risk: the population-based Canadian Multicentre Osteoporosis Study (CaMoS). Osteoporos Int 2014; 25:1473-81. [PMID: 24566587 PMCID: PMC5094888 DOI: 10.1007/s00198-014-2649-x] [Citation(s) in RCA: 58] [Impact Index Per Article: 5.8] [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: 11/28/2013] [Accepted: 02/05/2014] [Indexed: 01/22/2023]
Abstract
UNLABELLED We used data from a large, prospective Canadian cohort to assess the association between selective serotonin reuptake inhibitors (SSRIs) and serotonin and noradrenaline reuptake inhibitors (SNRIs) and fracture. We found an increased risk of fractures in individuals who used SSRI or SNRI, even after controlling for multiple risk factors. INTRODUCTION Previous studies have suggested an association between SSRIs and increasing risk of fragility fractures. However, the majority of these studies were not long-term analyses or were performed using administrative data and, thus, could not fully control for potential confounders. We sought to determine whether the use of SSRIs and SNRIs is associated with increased risk of fragility fracture, in adults aged 50 + . METHODS We used data from the Canadian Multicentre Osteoporosis Study (CaMos), a prospective randomly selected population-based community cohort; our analyses focused on subjects aged 50+. Time to event methodology was used to assess the association between SSRI/SNRI use, modeled time-dependently, and fragility fracture. RESULTS Among 6,645 subjects, 192 (2.9%) were using SSRIs or/and SNRIs at baseline. During the 10-year study period, 978 (14.7%) participants experienced at least one fragility fracture. In our main analysis, SSRI/SNRI use was associated with increased risk of fragility fracture (hazard ratio (HR), 1.88; 95% confidence intervals (CI), 1.48-2.39). After controlling for multiple risk factors, including Charlson score, previous falls, and bone mineral density hip and lumbar bone density, the adjusted HR for current SSRI/SNRI use remained elevated (HR, 1.68; 95% CI, 1.32-2.14). CONCLUSIONS Our results lend additional support to an association between SSRI/SNRI use and fragility fractures. Given the high prevalence of antidepressants use, and the impact of fractures on health, our findings may have a significant clinical impact.
Collapse
Affiliation(s)
- C Moura
- McGill University, Montreal, Canada,
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
Collapse
|
32
|
Elicin O, Herrera F, Callaway S, Prior J, Ozsahin M. The Use of 18FDG-PET Standard Uptake Value as a Metabolic Predictor of Bone Marrow Response to Radiation: Impact on Acute and Late Hematological Toxicity in Cervical Cancer Patients Treated With Chemoradiation Therapy. Int J Radiat Oncol Biol Phys 2013. [DOI: 10.1016/j.ijrobp.2013.06.087] [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]
|
33
|
Zhang K, Corsa C, Prior J, Piwnica-Worms D, Longmore GD. Abstract 3939: The collagen receptor discoidin domain receptor 2 facilitates breast cancer metastasis by stabilizing Snail1 protein. Cancer Res 2013. [DOI: 10.1158/1538-7445.am2013-3939] [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] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Abstract
Mammographic density is a leading risk factor for the development of breast cancer and these cancers are more invasive and metastatic. The increase in breast density is, in part, due to increased fibrillar collagen deposition. In an RNAi human kinome screen to identify post-transcriptional regulators of Snail1 protein stability we found the collagen receptor DDR2, but not related DDR1, to stabilize Snail1 protein as a result of collagen I activated DDR2 stimulation of ERK2 activity. This can occur independent of β1-integrin and TGFβ signals. DDR2 is not required for TGFβ-induced Epithelial Mesenchymal transition (EMT) or EMT-induced Snail1 transcription. Rather DDR2 expression, which is absent in normal breast epithelia, is induced during EMT as breast tumor cells assume invasive, mesenchymal features. DDR2-induced ERK2 activity stabilizes Snail1 protein level in two ways. First, ERK2 interacts with and phosphorylates Snail1 and second ERK2 inhibits GSK3b.
DDR2 was found to be critical for breast cancer cell invasion and migration in vitro, in 3D collagen gels, and breast cancer metastasis in vivo, in syngeneic xenograft models. A majority of human invasive ductal breast carcinomas express DDR2 protein and there is a strong association between nuclear Snail1 expression, DDR2 expression, and the absence of E-cadherin expression. The small group of breast cancer patients with tumors harboring increased DDR2 gene copy number has diminished survival. We propose that DDR2 acts in a positive feedback loop to maintain Snail1 protein level and activity in breast tumor cells at the leading, invasive edge where tumor cells that have undergone EMT and invaded through the basement membrane to encounter extracellular matrix collagen I. This facilitates the continued tumor cell invasion and migration through the collagen I-rich ECM, and thereby, contributes to breast cancer metastasis.
That the collagen I receptor DDR2 maintains the EMT-inducing Snail1 protein level and activity and contributes to breast cancer metastasis could explain the increase in metastasis of breast cancers in women with dense breasts. As such, DDR2 could be considered a novel RTK target for the treatment of breast cancer metastasis.
Citation Format: Kun Zhang, Callie Corsa, Julie Prior, David Piwnica-Worms, Gregory D. Longmore. The collagen receptor discoidin domain receptor 2 facilitates breast cancer metastasis by stabilizing Snail1 protein. [abstract]. In: Proceedings of the 104th Annual Meeting of the American Association for Cancer Research; 2013 Apr 6-10; Washington, DC. Philadelphia (PA): AACR; Cancer Res 2013;73(8 Suppl):Abstract nr 3939. doi:10.1158/1538-7445.AM2013-3939
Collapse
Affiliation(s)
- Kun Zhang
- Washington Univ. School of Medicine, St. Louis, MO
| | - Callie Corsa
- Washington Univ. School of Medicine, St. Louis, MO
| | - Julie Prior
- Washington Univ. School of Medicine, St. Louis, MO
| | | | | |
Collapse
|
34
|
Elicin O, Herrera F, Callaway S, Prior J, Ozsahin M. PD-0604: Impact of bone marrow radiation dose on acute and late hematological toxicity in cervical cancer patients. Radiother Oncol 2013. [DOI: 10.1016/s0167-8140(15)32910-8] [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]
|
35
|
Abstract
The computation of scientific data can be very time-consuming, even if they are ultimately determined by a small number of parameters. The principle of compressed sampling suggests that for typical data we can achieve a considerable decrease in the computation time by avoiding the need to sample the full data set. We demonstrate the usefulness of this approach at the hand of two-dimensional (2-D) spectra in the context of ultrafast nonlinear spectroscopy of biological systems where numerical calculations are highly challenging due to the considerable computational effort involved in obtaining individual data points.
Collapse
Affiliation(s)
- J Almeida
- †Institute for Theoretical Physics, University Ulm, Albert-Einstein-Allee 11, D-89069 Ulm, Germany
- §Institute for Integrated Quantum Science and Technology, University Ulm, Albert-Einstein-Allee 11, D-89069 Ulm, Germany
| | - J Prior
- ‡Departamento de Física Aplicada, Universidad Politécnica de Cartagena, Cartagena 30202, Spain
| | - M B Plenio
- †Institute for Theoretical Physics, University Ulm, Albert-Einstein-Allee 11, D-89069 Ulm, Germany
- §Institute for Integrated Quantum Science and Technology, University Ulm, Albert-Einstein-Allee 11, D-89069 Ulm, Germany
| |
Collapse
|
36
|
Maillard MH, Hiroz P, Wagner D, Prior J, Boubaker A, Pralong F, Dorta G, Nichita C. [Gastrointestinal neuroendocrine tumors: pleomorphic and often ignored]. Rev Med Suisse 2012; 8:1658-1663. [PMID: 22988725] [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] [Subscribe] [Scholar Register] [Indexed: 06/01/2023]
Abstract
Although generally considered as rare, incidence of gastrointestinal neuroendocrine tumors (GI-NETs) is increasing. The general practitioner has thus to be familiar with the vast array of clinical presentations and the growing family of diagnostic tools that can be used. Symptoms can be related to their hormonal production, their local extent or a bleeding complication. The prognosis depends on the grade of tumor, its local extent at diagnosis and its localization. The diagnosis relies on radiologic, endoscopic and nuclear medicine strategies. In case of typical symptoms, a hormonal secretion should be sought. Treatment options are extensive and should be discussed in an interdisciplinary manner.
Collapse
Affiliation(s)
- M H Maillard
- Service de gastroentérologie et hépatologie, CHUV, Lausanne.
| | | | | | | | | | | | | | | |
Collapse
|
37
|
Pazolli E, Alspach E, Milczarek A, Prior J, Piwnica-Worms D, Stewart SA. Chromatin remodeling underlies the senescence-associated secretory phenotype of tumor stromal fibroblasts that supports cancer progression. Cancer Res 2012; 72:2251-61. [PMID: 22422937 DOI: 10.1158/0008-5472.can-11-3386] [Citation(s) in RCA: 131] [Impact Index Per Article: 10.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
Abstract
Age is a major risk factor for the development of cancer. Senescent fibroblasts, which accumulate with age, secrete protumorigenic factors collectively referred to as the senescence-associated secretory phenotype (SASP). Here, we examined the molecular mechanisms that control SASP activation, focusing on the known SASP factor osteopontin (OPN). We found that expression of the canonical SASP members interleukin (IL)-6 and IL-8, but not OPN, were dependent upon a persistent DNA damage response (DDR) as evidenced by ATM and NF-κB activation. Treatment with several histone deacetylase (HDAC) inhibitors robustly activated SASP in the absence of DNA breaks, suggesting that DDR-dependent SASP activation occurs in response to chromatin remodeling rather than physical breaks in DNA. In the setting of HDAC inhibition, IL-6 and IL-8 expression remained dependent upon ATM and NF-κB, while OPN expression remained independent of these factors. Further analysis revealed that HDAC1 inhibition was sufficient to induce OPN expression, which is interesting given that loss of HDAC1 expression correlates with increased OPN expression within the stromal compartment of invasive breast cancers. Importantly, fibroblasts treated with HDAC inhibitors promoted tumor growth in vivo. Our findings therefore indicate that HDAC modulation plays an important role in stromal cell activation, with important implications for the use of HDAC inhibitors in the treatment of cancer.
Collapse
Affiliation(s)
- Ermira Pazolli
- Department of Cell Biology and Physiology, Washington University School of Medicine, St. Louis, Missouri 63110, USA
| | | | | | | | | | | |
Collapse
|
38
|
Fraser LA, Langsetmo L, Berger C, Ioannidis G, Goltzman D, Adachi JD, Papaioannou A, Josse R, Kovacs CS, Olszynski WP, Towheed T, Hanley DA, Kaiser SM, Prior J, Jamal S, Kreiger N, Brown JP, Johansson H, Oden A, McCloskey E, Kanis JA, Leslie WD. Fracture prediction and calibration of a Canadian FRAX® tool: a population-based report from CaMos. Osteoporos Int 2011; 22:829-37. [PMID: 21161508 PMCID: PMC5101064 DOI: 10.1007/s00198-010-1465-1] [Citation(s) in RCA: 113] [Impact Index Per Article: 8.7] [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: 06/09/2010] [Accepted: 09/03/2010] [Indexed: 10/18/2022]
Abstract
UNLABELLED A new Canadian WHO fracture risk assessment (FRAX®) tool to predict 10-year fracture probability was compared with observed 10-year fracture outcomes in a large Canadian population-based study (CaMos). The Canadian FRAX tool showed good calibration and discrimination for both hip and major osteoporotic fractures. INTRODUCTION The purpose of this study was to validate a new Canadian WHO fracture risk assessment (FRAX®) tool in a prospective, population-based cohort, the Canadian Multicentre Osteoporosis Study (CaMos). METHODS A FRAX tool calibrated to the Canadian population was developed by the WHO Collaborating Centre for Metabolic Bone Diseases using national hip fracture and mortality data. Ten-year FRAX probabilities with and without bone mineral density (BMD) were derived for CaMos women (N = 4,778) and men (N = 1,919) and compared with observed fracture outcomes to 10 years (Kaplan-Meier method). Cox proportional hazard models were used to investigate the contribution of individual FRAX variables. RESULTS Mean overall 10-year FRAX probability with BMD for major osteoporotic fractures was not significantly different from the observed value in men [predicted 5.4% vs. observed 6.4% (95%CI 5.2-7.5%)] and only slightly lower in women [predicted 10.8% vs. observed 12.0% (95%CI 11.0-12.9%)]. FRAX was well calibrated for hip fracture assessment in women [predicted 2.7% vs. observed 2.7% (95%CI 2.2-3.2%)] but underestimated risk in men [predicted 1.3% vs. observed 2.4% (95%CI 1.7-3.1%)]. FRAX with BMD showed better fracture discrimination than FRAX without BMD or BMD alone. Age, body mass index, prior fragility fracture and femoral neck BMD were significant independent predictors of major osteoporotic fractures; sex, age, prior fragility fracture and femoral neck BMD were significant independent predictors of hip fractures. CONCLUSION The Canadian FRAX tool provides predictions consistent with observed fracture rates in Canadian women and men, thereby providing a valuable tool for Canadian clinicians assessing patients at risk of fracture.
Collapse
Affiliation(s)
- L-A Fraser
- Department of Clinical Epidemiology and Biostatistics and Medicine, McMaster University, Hamilton, Ontario, Canada
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
Collapse
|
39
|
Fraser LA, Ioannidis G, Adachi JD, Pickard L, Kaiser SM, Prior J, Brown JP, Hanley DA, Olszynski WP, Anastassiades T, Jamal S, Josse R, Goltzman D, Papaioannou A. Fragility fractures and the osteoporosis care gap in women: the Canadian Multicentre Osteoporosis Study. Osteoporos Int 2011; 22:789-96. [PMID: 20683706 PMCID: PMC5101074 DOI: 10.1007/s00198-010-1359-2] [Citation(s) in RCA: 34] [Impact Index Per Article: 2.6] [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: 04/14/2010] [Accepted: 06/16/2010] [Indexed: 01/06/2023]
Abstract
UNLABELLED Canadian women over 50 years old were studied over a 10-year period to see if those who sustained a fracture (caused by minimal trauma) were receiving the recommended osteoporosis therapy. We found that approximately half of these women were not being treated, indicating a significant care gap in osteoporosis treatment. INTRODUCTION Prevalent fragility fracture strongly predicts future fracture. Previous studies have indicated that women with fragility fractures are not receiving the indicated treatment. We aimed to describe post fracture care in Canadian women using a large, population-based prospective cohort that began in 1995-1997. METHODS We followed 5,566 women over 50 years of age from across Canada over a period of 10 years in the Canadian Multicentre Osteoporosis Study. Information on medication use and incident clinical fragility fractures was obtained during a yearly questionnaire or interview and fractures were confirmed by radiographic/medical reports. RESULTS Over the 10-year study period, 42-56% of women with yearly incident clinical fragility fractures were not treated with an osteoporosis medication. During year 1 of the study, 22% of the women who had experienced a fragility fracture were on treatment with a bisphosphonate and 26% were on hormone therapy (HT). We were not able to differentiate HT use for menopause symptoms vs osteoporosis. Use of bisphosphonate therapy increased over time; odds ratio (OR) for use at year 10 compared to use at year 1 was 3.65 (95% confidence interval (CI) 1.83-7.26). In contrast, HT use declined, with an OR of 0.07 (95%CI 0.02-0.24) at year 10 compared to year 1 of the study. CONCLUSION In a large population-based cohort study, we found a therapeutic care gap in women with osteoporosis and fragility fractures. Although bisphosphonate therapy usage improved over time, a substantial gap remains.
Collapse
Affiliation(s)
- L-A Fraser
- Departments of Epidemiology and Medicine, Hamilton Health Sciences-Chedoke Site, McMaster University, 1200 Main Street West, Hamilton, ON L8N3Z5, Canada
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
Collapse
|
40
|
Li D, Al Mehthel M, Pudek M, Ur E, Francis G, Prior J, Ronco J, Wong G, Redekop G, Sirrs S. Catecholamine response in critical illness. Clin Biochem 2010. [DOI: 10.1016/j.clinbiochem.2010.04.035] [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]
|
41
|
Prior J, Mascaro B, Shark LK, Stockdale J, Selfe J, Bury R, Cole P, Goodacre JA. Analysis of high frequency acoustic emission signals as a new approach for assessing knee osteoarthritis. Ann Rheum Dis 2010; 69:929-30. [PMID: 20413570 DOI: 10.1136/ard.2009.112599] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022]
|
42
|
Mascaro B, Prior J, Shark LK, Selfe J, Cole P, Goodacre J. Exploratory study of a non-invasive method based on acoustic emission for assessing the dynamic integrity of knee joints. Med Eng Phys 2009; 31:1013-22. [DOI: 10.1016/j.medengphy.2009.06.007] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/10/2008] [Revised: 05/12/2009] [Accepted: 06/17/2009] [Indexed: 10/20/2022]
|
43
|
Montemurro M, Prior J, Leyvraz S. 6630 Response evaluation in third- and fourth-line treatment of GIST: the role of PET. EJC Suppl 2009. [DOI: 10.1016/s1359-6349(09)71351-5] [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: 10/20/2022] Open
|
44
|
Prior J, Burdge D, Maan E, Milner R, Hankins C, Klein M, Walmsley S. Fragility fractures and bone mineral density in HIV positive women: a case-control population-based study. Osteoporos Int 2007; 18:1345-53. [PMID: 17665239 DOI: 10.1007/s00198-007-0428-7] [Citation(s) in RCA: 89] [Impact Index Per Article: 5.2] [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: 01/16/2007] [Accepted: 04/11/2007] [Indexed: 11/26/2022]
Abstract
UNLABELLED This Canadian study of bone health showed that HIV+ women were more likely to have had fragility fractures (OR 1.7) but had BMD values that were not different than women from a national population-based cohort. INTRODUCTION Given that 17.5 million women globally are HIV-infected and living longer on anti-retroviral therapy (ART+), it is essential to determine whether they are at risk for osteoporosis as is currently assumed. METHODS Assessment of osteoporosis risk factors and lifetime low-trauma (fragility) fracture history used a common interviewer-administered questionnaire and phantom-adjusted bone mineral density (BMD). This study compared HIV+ Canadian women with age- and region-matched control women (1:3) from a national population-based study of osteoporosis. RESULTS One hundred and thirty-eight HIV+ women (100 ART+, 38 ART-) were compared with 402 controls. There were no differences in age (37.7 vs. 38.0 years), BMI (25.0 vs. 26.2), family history of osteoporosis, exercise history, alcohol or calcium intakes, age at menarche, oral contraceptive use or parity. HIV+ cases included more Aboriginal and Black women (12.5% and 16.2 vs. 2% and 1%, respectively), smoked and used injection drugs (53%) more, were more often treated with glucocorticoids, had oligomenorrhea, and reported 10-kg weight cycling. Significantly more HIV+ women reported lifetime fragility fractures (26.1% vs. 17.3; OR 1.7, 95% CI 1.1, 2.6). HIV+ and control women did not differ in BMD: spine 1.0 +/- 0.12 vs.1.0 +/- 0.14 g/cm(2) (diff. 0.0, 95% CI -0.27, 0.27) or total femur 0.91 +/- 0.15 vs. 0.93 +/- 0.12 g/cm(2) (diff 0.02, 95% CI +0.005, -0.045). CONCLUSION HIV+ women reported significantly more past osteoporotic fractures than population-based controls despite normal BMD. Research is needed to assess bone microarchitecture and develop a reliable fracture risk assessment tool for HIV+ women.
Collapse
Affiliation(s)
- J Prior
- Medicine/Endocrinology, University of British Columbia, Vancouver, Canada.
| | | | | | | | | | | | | |
Collapse
|
45
|
Abstract
We find the conductance distribution function of the two-dimensional Anderson model in the strongly localized limit. The fluctuations of lng grow with lateral size as L1/3 and follow a universal distribution that depends on the type of leads. For narrow leads, it is the Tracy-Widom distribution, which appears in the problem of the largest eigenvalue of random matrices from the Gaussian unitary ensemble and in many other problems like the longest increasing subsequence of a permutation, directed polymers, or polynuclear growth. We also show that for wide leads the conductance follows a related, but different, distribution.
Collapse
Affiliation(s)
- A M Somoza
- Departamento de Física-CIOyN, Universidad de Murcia, Murcia 30.071, Spain
| | | | | |
Collapse
|
46
|
Harpstrite SE, Prior J, Rath NP, Sharma V. Metalloprobes: synthesis, characterization, and potency of a novel gallium(III) complex in human epidermal carcinoma cells. J Inorg Biochem 2007; 101:1347-53. [PMID: 17617464 PMCID: PMC4349512 DOI: 10.1016/j.jinorgbio.2007.04.013] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.9] [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: 03/02/2007] [Revised: 04/17/2007] [Accepted: 04/20/2007] [Indexed: 12/20/2022]
Abstract
Multidrug resistance (MDR) mediated by overexpression of the MDR1 gene product, P-glycoprotein (Pgp), represents one of the best characterized barriers to chemotherapeutic treatment in cancer and may be a pivotal factor in progression of Alzheimer's disease (AD). Thus, agents capable of probing Pgp-mediated transport could be beneficial in biomedical imaging. Herein, we synthesized and structurally characterized a gallium(III) complex (5) of the naphthol-Schiff base ligand. The crystal structure revealed octahedral geometry for the metallodrug. Cytotoxicity profiles of 5 were evaluated in KB-3-1 (Pgp-) and KB-8-5 (Pgp+) human epidermal carcinoma cell lines. Compared with an LC(50) (the half-maximal cytotoxic concentration) value of 1.93 microM in drug-sensitive (Pgp-) cells, the gallium(III) complex 5 demonstrated an LC(50) value>100 microM in drug-resistant (Pgp+) cells, thus indicating that 5 was recognized by the Pgp as its substrate, thereby extruded from the cells and sequestered away from their cytotoxic targets. Radiolabeled analogues of 5 could be beneficial in noninvasive imaging of Pgp-mediated transport in vivo.
Collapse
Affiliation(s)
- Scott E. Harpstrite
- Molecular Imaging Center, Mallinckrodt Institute of Radiology, Washington University Medical School, St. Louis, MO 63110
| | - Julie Prior
- Molecular Imaging Center, Mallinckrodt Institute of Radiology, Washington University Medical School, St. Louis, MO 63110
| | - Nigam P. Rath
- Department of Chemistry & Biochemistry, University of Missouri, St. Louis, MO 63121
| | - Vijay Sharma
- Molecular Imaging Center, Mallinckrodt Institute of Radiology, Washington University Medical School, St. Louis, MO 63110
- Correspondence: Vijay Sharma, Ph.D., Mallinckrodt Institute of Radiology, Washington University Medical School, Box 8225, 510 S. Kingshighway Blvd., St. Louis, MO 63110, Tele: 314-362-9358; Fax: 314-362-0152,
| |
Collapse
|
47
|
Newton JT, Allen CD, Coates J, Turner A, Prior J. How to reduce the stress of general dental practice: the need for research into the effectiveness of multifaceted interventions. Br Dent J 2006; 200:437-40. [PMID: 16703032 DOI: 10.1038/sj.bdj.4813463] [Citation(s) in RCA: 33] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 09/27/2005] [Indexed: 11/08/2022]
Abstract
While the practice of dentistry has been demonstrated to be significantly stressful, there have been few published studies describing interventions to reduce the stress of dental practitioners. This article describes research into the prevention and alleviation of stress amongst a variety of healthcare professionals, including dental practitioners, and describes the findings from a small scale study of an intervention aimed at general dental practitioners who reported high levels of work related stress. It is argued that to be effective, interventions should be tailored to the individual needs of the practitioner, within a structured intervention framework. Further research into the effectiveness and cost-effectiveness of stress management for dental practitioners is required.
Collapse
Affiliation(s)
- J T Newton
- Oral Health Services Research & Dental Public Health, GKT Dental Institute London, USA.
| | | | | | | | | |
Collapse
|
48
|
Boubaker A, Prior J, Antonescu C, Meyrat B, Frey P, Delaloye AB. F+0 renography in neonates and infants younger than 6 months: an accurate method to diagnose severe obstructive uropathy. J Nucl Med 2001; 42:1780-8. [PMID: 11752073] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/23/2023] Open
Abstract
UNLABELLED We studied the response to F+0 renography and the relative and absolute individual kidney function in neonates and < 6-mo-old infants before and after surgery for unilateral ureteropelvic junction obstruction (UJO). METHODS The results obtained at diagnosis and after pyeloplasty for 9 children (8 boys, 1 girl; age range, 0.8-5.9 mo; mean age +/- SD, 2.4 +/- 1.5 mo) with proven unilateral UJO (i.e., affected kidney [AK]) and an unremarkable contralateral kidney (i.e., normal kidney [NK]) were evaluated and compared with a control group of 10 children (6 boys, 4 girls; age range, 0.8-2.8 mo; mean age, 1.5 +/- 0.7 mo) selected because of symmetric renal function, absence of vesicoureteral reflux or infection, and an initially dilated but not obstructed renal pelvis as proven by follow-up. Renography was performed for 20 min after injection of (123)I-hippuran (OIH) (0.5-1.0 MBq/kg) immediately followed by furosemide (1 mg/kg). The relative and absolute renal functions and the response to furosemide were measured on background-subtracted and depth-corrected renograms. The response to furosemide was quantified by an elimination index (EI), defined as the ratio of the 3- to 20-min activities: An EI > or = 3 was considered definitively normal and an EI < or = 1 definitively abnormal. If EI was equivocal (1 < EI < 3), the response to gravity-assisted drainage was used to differentiate AKs from NKs. Absolute separate renal function was measured by an accumulation index (AI), defined as the percentage of (123)I-OIH (%ID) extracted by the kidney 30-90 s after maximal cardiac activity. RESULTS All AKs had definitively abnormal EIs at diagnosis (mean, 0.56 +/- 0.12) and were significantly lower than the EIs of the NKs (mean, 3.24 +/- 1.88) and of the 20 control kidneys (mean, 3.81 +/- 1.97; P < 0.001). The EIs of the AKs significantly improved (mean, 2.81 +/- 0.64; P < 0.05) after pyeloplasty. At diagnosis, the AIs of the AKs were significantly lower (mean, 6.31 +/- 2.33 %ID) than the AIs of the NKs (mean, 9.43 +/- 1.12 %ID) and of the control kidneys (mean, 9.05 +/- 1.17 %ID; P < 0.05). The AIs of the AKs increased at follow-up (mean, 7.81 +/- 2.23 %ID) but remained lower than those of the NKs (mean, 10.75 +/- 1.35 %ID; P < 0.05). CONCLUSION In neonates and infants younger than 6 mo, (123)I-OIH renography with early furosemide injection (F+0) allowed us to reliably diagnose AKs and to determine if parenchymal function was normal or impaired and if it improved after surgery.
Collapse
Affiliation(s)
- A Boubaker
- Department of Nuclear Medicine and Paediatric Surgery, Centre Hospitalier Universitaire Vaudois, Lausanne, Switzerland
| | | | | | | | | | | |
Collapse
|
49
|
Neubauer H, Meyer H, Prior J, Aleksic S, Hensel A, Splettstösser W. A combination of different polymerase chain reaction (PCR) assays for the presumptive identification of Yersinia pestis. J Vet Med B Infect Dis Vet Public Health 2000; 47:573-80. [PMID: 11075545 DOI: 10.1046/j.1439-0450.2000.00384.x] [Citation(s) in RCA: 30] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
A combination of four polymerase chain reaction (PCR) assays targeting the Yersinia pestis-specific plasmoidal genes of the fraction 1 capsular antigen and plasminogen activator/coagulase, the gene of the V antigen of the Yersinia virulence plasmid, and the chromosomal 16S rRNA gene was evaluated for the identification of Y. pestis isolates. All four assays were subjected to the same sample preparation technique, reagents and cycling conditions. Eighteen Y. pestis, 66 Y. pseudotuberculosis, 40 Y. enterocolitica strains, the type strains of the other Yersinia species, and 20 other pathogenic bacterial strains were investigated. By using the proposed combination of PCR assays all Y. pestis strains were identified correctly. The applicability of this combination of PCR assays was demonstrated by the detection of Y. pestis DNA in spiked tissues from Rattus norwegicus and fleas (Xenopsylla cheopis and Ctenocephalides spp.). As little as 60 genome equivalents were detected. This system is applicable for monitoring Y. pestis and its vectors in enzootic natural foci and in the diagnosis of plague in humans and animals.
Collapse
Affiliation(s)
- H Neubauer
- Institut für Mikrobiologie, Sanitätsakademie der Bundeswehr, München, Germany
| | | | | | | | | | | |
Collapse
|
50
|
Prior J. Why wound care testing? Adv Wound Care 1999; 12:303. [PMID: 10687549] [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: 02/15/2023]
|