1
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Weathered C, Bardehle S, Yoon C, Kumar N, Leyns CEG, Kennedy ME, Bloomingdale P, Pienaar E. Microglial roles in Alzheimer's disease: An agent-based model to elucidate microglial spatiotemporal response to beta-amyloid. CPT Pharmacometrics Syst Pharmacol 2024; 13:449-463. [PMID: 38078626 PMCID: PMC10941569 DOI: 10.1002/psp4.13095] [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] [Subscribe] [Scholar Register] [Received: 03/29/2023] [Revised: 11/16/2023] [Accepted: 11/20/2023] [Indexed: 02/03/2024] Open
Abstract
Alzheimer's disease (AD) is characterized by beta-amyloid (Aβ) plaques in the brain and widespread neuronal damage. Because of the high drug attrition rates in AD, there is increased interest in characterizing neuroimmune responses to Aβ plaques. In response to AD pathology, microglia are innate phagocytotic immune cells that transition into a neuroprotective state and form barriers around plaques. We seek to understand the role of microglia in modifying Aβ dynamics and barrier formation. To quantify the influence of individual microglia behaviors (activation, chemotaxis, phagocytosis, and proliferation) on plaque size and barrier coverage, we developed an agent-based model to characterize the spatiotemporal interactions between microglia and Aβ. Our model qualitatively reproduces mouse data trends where the fraction of microglia coverage decreases as plaques become larger. In our model, the time to microglial arrival at the plaque boundary is significantly negatively correlated (p < 0.0001) with plaque size, indicating the importance of the time to microglial activation for regulating plaque size. In addition, in silico behavioral knockout simulations show that phagocytosis knockouts have the strongest impact on plaque size, but modest impacts on microglial coverage and activation. In contrast, the chemotaxis knockouts had a strong impact on microglial coverage with a more modest impact on plaque volume and microglial activation. These simulations suggest that phagocytosis, chemotaxis, and replication of activated microglia have complex impacts on plaque volume and coverage, whereas microglial activation remains fairly robust to perturbations of these functions. Thus, our work provides insights into the potential and limitations of targeting microglial activation as a pharmacological strategy for the treatment of AD.
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Affiliation(s)
- Catherine Weathered
- Weldon School of Biomedical EngineeringPurdue UniversityWest LafayetteIndianaUSA
| | - Sophia Bardehle
- NeuroimmunologyMerck & Co., Inc.RahwayNew JerseyUSA
- Present address:
Cerevel TherapeuticsCambridgeMassachusettsUSA
| | - Choya Yoon
- NeuroimmunologyMerck & Co., Inc.RahwayNew JerseyUSA
| | - Niyanta Kumar
- Pharmacokinetics and PharmacodynamicsMerck & Co., Inc.RahwayNew JerseyUSA
- Present address:
Mersana TherapeuticsCambridgeMassachusettsUSA
| | | | | | - Peter Bloomingdale
- Quantitative Pharmacology and PharmacometricsMerck & Co., Inc.RahwayNew JerseyUSA
- Present address:
Boehringer IngelheimIngelheim am RheinGermany
| | - Elsje Pienaar
- Weldon School of Biomedical EngineeringPurdue UniversityWest LafayetteIndianaUSA
- Regenstrief Center for Healthcare EngineeringWest LafayetteIndianaUSA
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2
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Jaiswal A, Verma A, Dannenfelser R, Melssen M, Tirosh I, Izar B, Kim T, Nirschl C, Devi S, Olson W, Slingluff C, Engelhard V, Garraway L, Regev A, Yoon C, Troyanskaya O, Elemento O, Suarez-Farinas M, Anandasabapathy N. 037 A systems immunology approach to classify melanoma tumor infiltrating lymphocytes (TILs) informs and models overall survival. J Invest Dermatol 2022. [DOI: 10.1016/j.jid.2022.05.091] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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3
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Liu K, Milligan M, Schoenfeld J, Tishler R, Ng A, Devlin P, Fite E, Hanna G, Silk A, Yoon C, Thakuria M, Margalit D. MO-0151 Outcomes after hypofractionated radiotherapy for non-metastatic Merkel cell carcinoma. Radiother Oncol 2022. [DOI: 10.1016/s0167-8140(22)02311-8] [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: 11/25/2022]
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4
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Margalit D, Fite E, Schoenfeld J, Tishler R, Silk A, Hanna G, DeCaprio J, Yoon C, Thakuria M. Changes in Merkel Cell Oncoprotein Antibodies (AMERK) After Radiation Therapy (RT) in Curatively Treated Merkel Cell Carcinoma (MCC) and Association With Recurrence. Int J Radiat Oncol Biol Phys 2021. [DOI: 10.1016/j.ijrobp.2021.07.119] [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]
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5
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Kalinski AL, Yoon C, Huffman LD, Duncker PC, Kohen R, Passino R, Hafner H, Johnson C, Kawaguchi R, Carbajal KS, Jara JS, Hollis E, Geschwind DH, Segal BM, Giger RJ. Analysis of the immune response to sciatic nerve injury identifies efferocytosis as a key mechanism of nerve debridement. eLife 2020; 9:60223. [PMID: 33263277 PMCID: PMC7735761 DOI: 10.7554/elife.60223] [Citation(s) in RCA: 73] [Impact Index Per Article: 18.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/19/2020] [Accepted: 12/01/2020] [Indexed: 12/12/2022] Open
Abstract
Sciatic nerve crush injury triggers sterile inflammation within the distal nerve and axotomized dorsal root ganglia (DRGs). Granulocytes and pro-inflammatory Ly6Chigh monocytes infiltrate the nerve first and rapidly give way to Ly6Cnegative inflammation-resolving macrophages. In axotomized DRGs, few hematogenous leukocytes are detected and resident macrophages acquire a ramified morphology. Single-cell RNA-sequencing of injured sciatic nerve identifies five macrophage subpopulations, repair Schwann cells, and mesenchymal precursor cells. Macrophages at the nerve crush site are molecularly distinct from macrophages associated with Wallerian degeneration. In the injured nerve, macrophages ‘eat’ apoptotic leukocytes, a process called efferocytosis, and thereby promote an anti-inflammatory milieu. Myeloid cells in the injured nerve, but not axotomized DRGs, strongly express receptors for the cytokine GM-CSF. In GM-CSF-deficient (Csf2-/-) mice, inflammation resolution is delayed and conditioning-lesion-induced regeneration of DRG neuron central axons is abolished. Thus, carefully orchestrated inflammation resolution in the nerve is required for conditioning-lesion-induced neurorepair.
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Affiliation(s)
- Ashley L Kalinski
- Department of Cell and Developmental Biology, University of Michigan Medical School, Ann Arbor, United States
| | - Choya Yoon
- Department of Cell and Developmental Biology, University of Michigan Medical School, Ann Arbor, United States
| | - Lucas D Huffman
- Department of Cell and Developmental Biology, University of Michigan Medical School, Ann Arbor, United States.,Neuroscience Graduate Program, University of Michigan Medical School, Ann Arbor, United States
| | - Patrick C Duncker
- Department of Neurology, University of Michigan Medical School, Ann Arbor, United States
| | - Rafi Kohen
- Department of Cell and Developmental Biology, University of Michigan Medical School, Ann Arbor, United States.,Neuroscience Graduate Program, University of Michigan Medical School, Ann Arbor, United States
| | - Ryan Passino
- Department of Cell and Developmental Biology, University of Michigan Medical School, Ann Arbor, United States
| | - Hannah Hafner
- Department of Cell and Developmental Biology, University of Michigan Medical School, Ann Arbor, United States
| | - Craig Johnson
- Department of Cell and Developmental Biology, University of Michigan Medical School, Ann Arbor, United States
| | - Riki Kawaguchi
- Program in Neurogenetics, Department of Neurology, David Geffen School of Medicine, University of California, Los Angeles, Los Angeles, United States
| | - Kevin S Carbajal
- Department of Neurology, University of Michigan Medical School, Ann Arbor, United States
| | | | - Edmund Hollis
- Burke Neurological Institute, White Plains, United States.,The Feil Family Brain and Mind Research Institute, Weill Cornell Medicine, New York, United States
| | - Daniel H Geschwind
- Program in Neurogenetics, Department of Neurology, David Geffen School of Medicine, University of California, Los Angeles, Los Angeles, United States
| | - Benjamin M Segal
- Department of Neurology, The Ohio State University Wexner Medical Center, Columbus, United States.,The Neurological Institute, The Ohio State University, Columbus, United States
| | - Roman J Giger
- Department of Cell and Developmental Biology, University of Michigan Medical School, Ann Arbor, United States.,Neuroscience Graduate Program, University of Michigan Medical School, Ann Arbor, United States.,Department of Neurology, University of Michigan Medical School, Ann Arbor, United States
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6
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Chipidza F, Thakuria M, Schoenfeld J, Silk A, Catalano P, Yoon C, Hanna G, DeCaprio J, Tishler R, Margalit D. Effect of Treatment Center Experience on Survival after Diagnosis of Stage I-III Merkel Cell Carcinoma Treated with Surgery with or without Postoperative Radiation Therapy. Int J Radiat Oncol Biol Phys 2020. [DOI: 10.1016/j.ijrobp.2020.07.1012] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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7
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Sas AR, Carbajal KS, Jerome AD, Menon R, Yoon C, Kalinski AL, Giger RJ, Segal BM. A new neutrophil subset promotes CNS neuron survival and axon regeneration. Nat Immunol 2020; 21:1496-1505. [PMID: 33106668 PMCID: PMC7677206 DOI: 10.1038/s41590-020-00813-0] [Citation(s) in RCA: 118] [Impact Index Per Article: 29.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/26/2020] [Accepted: 09/16/2020] [Indexed: 12/25/2022]
Abstract
Transected axons typically fail to regenerate in the central nervous system (CNS), resulting in chronic neurological disability in individuals with traumatic brain or spinal cord injury, glaucoma and ischemic reperfusion injury of the eye. Although neuroinflammation is often depicted as detrimental, there is growing evidence that alternatively activated, reparative leukocyte subsets and their products can be deployed to improve neurological outcomes. In the current study we identify a unique granulocyte subset, with characteristics of an immature neutrophil, that had neuroprotective properties and drove CNS axon regeneration in vivo, in part via secretion of a cocktail of growth factors. This pro-regenerative neutrophil promoted repair in the optic nerve and spinal cord, demonstrating its relevance across CNS compartments and neuronal populations. Our findings could ultimately lead to the development of novel immunotherapies that reverse CNS damage and restore lost neurological function across a spectrum of diseases.
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Affiliation(s)
- Andrew R Sas
- Department of Neurology, The Ohio State University Wexner Medical Center, Columbus, OH, USA.,The Neuroscience Research Institute, The Ohio State University, Columbus, OH, USA.,Department of Neurology, University of Michigan, Ann Arbor, MI, USA
| | - Kevin S Carbajal
- Department of Neurology, University of Michigan, Ann Arbor, MI, USA
| | - Andrew D Jerome
- Department of Neurology, The Ohio State University Wexner Medical Center, Columbus, OH, USA.,The Neuroscience Research Institute, The Ohio State University, Columbus, OH, USA
| | - Rajasree Menon
- Department of Computational Medicine and Bioinformatics, University of Michigan, Ann Arbor, MI, USA
| | - Choya Yoon
- Department of Cell and Developmental Biology, University of Michigan, Ann Arbor, MI, USA
| | - Ashley L Kalinski
- Department of Cell and Developmental Biology, University of Michigan, Ann Arbor, MI, USA
| | - Roman J Giger
- Department of Cell and Developmental Biology, University of Michigan, Ann Arbor, MI, USA.,Neuroscience Graduate Program, University of Michigan, Ann Arbor, MI, USA
| | - Benjamin M Segal
- Department of Neurology, The Ohio State University Wexner Medical Center, Columbus, OH, USA. .,The Neuroscience Research Institute, The Ohio State University, Columbus, OH, USA. .,Department of Neurology, University of Michigan, Ann Arbor, MI, USA.
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8
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Choi W, Yoon C, Lee J, Lee C. Abstract No. 598 Recurrent malignant jejunojejunostomy obstruction after gastric surgery: palliation with fluoroscopy-guided stent placement. J Vasc Interv Radiol 2020. [DOI: 10.1016/j.jvir.2019.12.659] [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: 11/28/2022] Open
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9
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Choi W, Yoon C, Lee J, Lee C. Abstract No. 597 Percutaneous transhepatic enteral stent placement in patients with recurrent malignant obstruction in surgically altered bowel anatomy. J Vasc Interv Radiol 2020. [DOI: 10.1016/j.jvir.2019.12.658] [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] Open
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10
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Affiliation(s)
- DR Kang
- Chonbuk National University, South Korea
| | - SA Belal
- Sylhet Agricultural University, Bangladesh
| | - KD Song
- Chonbuk National University, South Korea
| | - C Yoon
- Chonbuk National University, South Korea
| | - BY Park
- Chonbuk National University, South Korea
| | - KS Shim
- Chonbuk National University, South Korea
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11
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Lin JX, Yoon C, Desiderio J, Yi BC, Li P, Zheng CH, Parisi A, Huang CM, Strong VE, Yoon SS. Development and validation of a staging system for gastric adenocarcinoma after neoadjuvant chemotherapy and gastrectomy with D2 lymphadenectomy. Br J Surg 2019; 106:1187-1196. [PMID: 31197829 DOI: 10.1002/bjs.11181] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/23/2018] [Revised: 01/21/2019] [Accepted: 02/25/2019] [Indexed: 12/12/2022]
Abstract
BACKGROUND Neoadjuvant chemotherapy followed by gastrectomy with D2 lymphadenectomy is commonly used for patients with locally advanced gastric adenocarcinoma. The eighth AJCC ypTNM staging system was validated based on patients undergoing more limited lymphadenectomy (less than D2). The aim of this study was to develop a system for accurate staging of patients with locally advanced gastric adenocarcinoma who receive neoadjuvant chemotherapy followed by gastrectomy with D2 lymphadenectomy. METHODS A modified system of ypTNM was developed, based on overall survival (OS) of patients receiving neoadjuvant chemotherapy followed by gastrectomy with D2 lymphadenectomy at Memorial Sloan Kettering Cancer Center, and validated using data from an international cohort of patients who had similar treatment. RESULTS Of 325 patients in the derivation cohort, 33 (10·2 per cent) had ypT0 N0/+ tumours, which are not classifiable under the AJCC system. The 5-year OS rate for modified ypTNM stages I, II, IIIA and IIIB was 89, 71, 42·3 and 10 per cent respectively, compared with 82, 65·2 and 24·1 for AJCC stages I, II and III respectively. The concordance index (0·730 versus 0·709), estimated area under the curve (0·765 versus 0·740) and time-dependent receiver operating characteristic (ROC) curve throughout the observation period were all superior for modified ypTNM staging. For the validation cohort of 186 patients, the modified system was again better at separating patients into prognostic groups for OS. CONCLUSION The modified ypTNM staging system improves the accuracy of OS prediction for patients treated with neoadjuvant chemotherapy followed by gastrectomy with D2 lymphadenectomy.
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Affiliation(s)
- J X Lin
- Department of Gastric Surgery, Fujian Medical University Union Hospital, Fuzhou, Fujian, China.,Department of Surgery, Memorial Sloan Kettering Cancer Center, New York, USA
| | - C Yoon
- Department of Surgery, Memorial Sloan Kettering Cancer Center, New York, USA
| | - J Desiderio
- Department of Digestive Surgery, St. Mary's Hospital, University of Perugia, Terni, Italy
| | - B C Yi
- Department of Surgery, Memorial Sloan Kettering Cancer Center, New York, USA
| | - P Li
- Department of Gastric Surgery, Fujian Medical University Union Hospital, Fuzhou, Fujian, China
| | - C H Zheng
- Department of Gastric Surgery, Fujian Medical University Union Hospital, Fuzhou, Fujian, China
| | - A Parisi
- Department of Digestive Surgery, St. Mary's Hospital, University of Perugia, Terni, Italy
| | - C M Huang
- Department of Gastric Surgery, Fujian Medical University Union Hospital, Fuzhou, Fujian, China
| | - V E Strong
- Department of Surgery, Memorial Sloan Kettering Cancer Center, New York, USA
| | - S S Yoon
- Department of Surgery, Memorial Sloan Kettering Cancer Center, New York, USA
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12
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Pawelec KM, Yoon C, Giger RJ, Sakamoto J. Engineering a platform for nerve regeneration with direct application to nerve repair technology. Biomaterials 2019; 216:119263. [PMID: 31220794 DOI: 10.1016/j.biomaterials.2019.119263] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/31/2019] [Revised: 06/05/2019] [Accepted: 06/07/2019] [Indexed: 12/16/2022]
Abstract
The development of effective treatment options for repair of peripheral nerves is complicated by lack of knowledge concerning the interactions between cells and implants. A promising device, the multichannel scaffold, incorporates microporous channels, aligning glia and directing axonal growth across a nerve gap. To enhance clinical outcomes of nerve repair, a platform, representative of current implant technology, was engineered which 1) recapitulated key device features (porosity and linearity) and 2) demonstrated remyelination of adult neurons. The in vitro platform began with the study of Schwann cells on porous polycaprolactone (PCL) and poly(lactide co-glycolide) (PLGA) substrates. Surface roughness determined glial cell attachment, and an additional layer of topography, 40 μm linear features, aligned Schwann cells and axons. In addition, direct co-culture of sensory neurons with Schwann cells significantly increased neurite outgrowth, compared to neurons cultured alone (naive or pre-conditioned). In contrast to the control substrate (glass), on porous PCL substrates, Schwann cells differentiated into a mature myelinating phenotype, expressing Oct-6, MPZ and MBP. The direct applicability of this platform to nerve implants, including its response to physiological cues, allows for optimization of cell-material interactions, close observation of the regeneration process, and the study of therapeutics, necessary to advance peripheral nerve repair technology.
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Affiliation(s)
- K M Pawelec
- University of Michigan, Department of Mechanical Engineering, Ann Arbor, MI, 48109, USA
| | - C Yoon
- University of Michigan, Department of Cell and Developmental Biology, Ann Arbor, MI, 48109, USA
| | - R J Giger
- University of Michigan, Department of Cell and Developmental Biology, Ann Arbor, MI, 48109, USA
| | - J Sakamoto
- University of Michigan, Department of Mechanical Engineering, Ann Arbor, MI, 48109, USA.
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13
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Min JY, Kim HJ, Yoon C, Lee K, Yeo M, Min KB. Tuberculosis infection via the emergency department among inpatients in South Korea: a propensity score matched analysis of the National Inpatient Sample. J Hosp Infect 2018; 100:92-98. [PMID: 29608938 PMCID: PMC7114590 DOI: 10.1016/j.jhin.2018.03.031] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/13/2017] [Accepted: 03/26/2018] [Indexed: 12/02/2022]
Abstract
BACKGROUND Emergency departments (EDs) carry a high risk of infectious disease transmission and have also been implicated in tuberculosis (TB) outbreaks. AIM To determine if patients who visit EDs have an increased risk of TB infection. Using South Korean inpatient sample data (2012), the risk of TB occurrence during 90 days after hospitalization for patients admitted via EDs was compared with that for patients admitted via outpatient clinics. METHODS The data of the 2012 Health Insurance Review and Assessment Service - National Inpatient Sample were used. TB diagnosis was based on International Classification of Diseases Version 10 [all TB (A15-A19), pulmonary TB (A15-A16) and extrapulmonary TB (A17-A18)]. FINDINGS After propensity score matching using the demographic and clinical characteristics of the patients, 191,997 patients (64,017 patients admitted via EDs and 127,908 patients admitted via outpatient clinics) were included in this study. There was no significant difference in baseline patient characteristics between the two groups. The percentage of patients with TB admitted via EDs was higher than that of patients admitted via outpatient clinics. The likelihood of active TB occurrence was 30% higher for all TB [hazard ratio (HR) 1.30; 95% confidence interval (CI) 1.12-1.52] and pulmonary TB (HR 1.30; 95% CI 1.10-1.53) in patients admitted via EDs compared with patients admitted via outpatient clinics; this difference was significant. However, no difference in the occurrence of extrapulmonary TB was observed between the two groups. CONCLUSIONS The likelihood of TB infection was greater in patients admitted via EDs than in patients admitted via outpatient clinics.
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Affiliation(s)
- J-Y Min
- Institute of Health and Environment, Seoul National University, Graduate School of Public Health, Seoul, Republic of Korea
| | - H-J Kim
- Institute of Health and Environment, Seoul National University, Graduate School of Public Health, Seoul, Republic of Korea
| | - C Yoon
- Institute of Health and Environment, Seoul National University, Graduate School of Public Health, Seoul, Republic of Korea; Department of Environmental Health Sciences, Seoul National University, Graduate School of Public Health, Seoul, Republic of Korea
| | - K Lee
- Institute of Health and Environment, Seoul National University, Graduate School of Public Health, Seoul, Republic of Korea; Department of Environmental Health Sciences, Seoul National University, Graduate School of Public Health, Seoul, Republic of Korea
| | - M Yeo
- Department of Architecture and Architectural Engineering, College of Engineering, Seoul National University, Seoul, Republic of Korea
| | - K-B Min
- Department of Preventive Medicine, College of Medicine, Seoul National University, Seoul, Republic of Korea.
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14
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Rabinowits G, Harris E, Chen T, Giobbie-Hurder A, Reilly M, Schoenfeld J, Margalit D, Wang L, Yoon C, Thakuria M. Extracapsular Nodal Extension Predicts Death and Recurrence in Merkel Cell Carcinoma (MCC). Int J Radiat Oncol Biol Phys 2018. [DOI: 10.1016/j.ijrobp.2017.12.190] [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: 11/17/2022]
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15
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Bae SJ, Ahn SG, Yoon C, Cha YJ, Jeong J. Abstract P4-02-11: Accuracy of breast magnetic resonance imaging has limited value to reduce the margin-positive rate: A study in relation to the molecular subtypes. Cancer Res 2018. [DOI: 10.1158/1538-7445.sabcs17-p4-02-11] [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] [Indexed: 11/16/2022]
Abstract
Abstract
Background: Newly released guideline standardizing a negative margin after breast-conservative surgery (BCS) as “no ink on tumor” by SSO-ASTRO stressed the importance of estimation tumor extent with comprehensive breast imaging studies. To evaluate clinical value of breast magnetic resonance imaging (MRI) in patients with BCS, we compared the degree of correlation between MRI-pathology and ultrasonography (US)-pathology according to subtypes. In addition, we investigated the margin-positive rates and secondary operation rates for margin clearance.
Methods: We identified patients with invasive breast cancer who had preoperative breast MRI and ultrasound between 2011 and 2016. We excluded patients having large tumor more than 5cm or multiple tumors or undergoing mastectomy. Patients were classified into 4 subtypes based on the immunohistochemistry; luminal A, luminal B/HER2, HER2, triple-negative breast cancer (TNBC). Lin's concordance correlation coefficient was used to measure the agreement between the MRI or US and tumor extent. Tumor extent was defined as pathologic tumor size including in situ carcinoma. Margin-positivity was assessed based on intraoperative frozen examination.
Results: A total 516 patients with single tumor undergoing BCS were included. Means of tumor size were 1.99 ± 0.91 cm by pathologic examination, 1.91 ± 1.01 cm by MRI, and 1.76 ± 0.92 cm by US, respectively. The correlation coefficient of MRI-pathology was significantly higher than that of US-pathology (r=0.6975 vs. 0.6211, P=0.001). A superiority of MRI than US in measuring pathologic extent was only observed in TNBC (r=0.8089 vs. 0.6014, P<0.001), whereas the agreement between the MRI or US and tumor extents was low in the HER2 (MRI: 0.3509, US: 0.3165). Also, the margin-positive rate was higher in HER2 (luminal A, 11.6%; luminal B/HER2, 17.5%; HER2, 29.6%; TNBC, 17.8%; P=0.0382). In the post-hoc test, the HER2 was more likely to have positive margin compared to Luminal A (P=0.0039). There is no significant difference in secondary operation as margin clearance according to the subtypes (P>0.999).
Margin positive and re-excision rates according to the subtypes Luminal A (n=302)Luminal B (n=80)HER2 (n=27)TNBC (n=107)P valuePositive margin35 (11.6)14 (17.5)8 (29.6)19 (17.8)0.0382Re-excision14 (4.6)4 (5.0)1 (3.7)5 (4.7)>0.9999
Conclusions: Given a superiority of MRI to US in preoperative assessment, MRI-guided BCS did not reduce the margin-positive rate in TNBC. In the HER2, size correlation of MRI-pathology was very low, and the margin-positive rate was high. Collectively, our findings suggest that accuracy of MRI has limited value to reduce the margin-positive rate.
Citation Format: Bae SJ, Ahn SG, Yoon C, Cha YJ, Jeong J. Accuracy of breast magnetic resonance imaging has limited value to reduce the margin-positive rate: A study in relation to the molecular subtypes [abstract]. In: Proceedings of the 2017 San Antonio Breast Cancer Symposium; 2017 Dec 5-9; San Antonio, TX. Philadelphia (PA): AACR; Cancer Res 2018;78(4 Suppl):Abstract nr P4-02-11.
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Affiliation(s)
- SJ Bae
- Gangnam Severance Hospital, Yonsei University College of Medicine, Seoul, Korea
| | - SG Ahn
- Gangnam Severance Hospital, Yonsei University College of Medicine, Seoul, Korea
| | - C Yoon
- Gangnam Severance Hospital, Yonsei University College of Medicine, Seoul, Korea
| | - YJ Cha
- Gangnam Severance Hospital, Yonsei University College of Medicine, Seoul, Korea
| | - J Jeong
- Gangnam Severance Hospital, Yonsei University College of Medicine, Seoul, Korea
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16
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Pacchierotti C, Ongaro F, van den Brink F, Yoon C, Prattichizzo D, Gracias DH, Misra S. Steering and control of miniaturized untethered soft magnetic grippers with haptic assistance. IEEE Trans Autom Sci Eng 2018; 15:290-306. [PMID: 31423113 PMCID: PMC6697175 DOI: 10.1109/tase.2016.2635106] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/02/2023]
Abstract
Untethered miniature robotics have recently shown promising results in several scenarios at the microscale, such as targeted drug delivery, microassembly, and biopsy procedures. However, the vast majority of these small-scale robots have very limited manipulation capabilities, and none of the steering systems currently available enable humans to intuitively and effectively control dexterous miniaturized robots in a remote environment. In this paper, we present an innovative micro teleoperation system with haptic assistance for the intuitive steering and control of miniaturized self-folding soft magnetic grippers in 2-D space. The soft grippers can be wirelessly positioned using weak magnetic fields and opened/closed by changing their temperature. An image-guided algorithm tracks the position of the controlled miniaturized gripper in the remote environment. A haptic interface provides the human operator with compelling haptic sensations about the interaction between the gripper and the environment, as well as enables the operator to intuitively control the target position and grasping configuration of the gripper. Finally, magnetic and thermal control systems regulate the position and grasping configuration of the gripper. The viability of the proposed approach is demonstrated through two experiments involving 26 human subjects. Providing haptic stimuli elicited statistically significant improvements in the performance of the considered navigation and micromanipulation tasks. Note to Practitioners-The ability to accurately and intuitively control the motion of miniaturized grippers in remote environments can open new exciting possibilities in the fields of minimally-invasive surgery, micromanipulation, biopsy, and drug delivery. This paper presents a micro teleoperation system with haptic assistance through which a clinician can easily control the motion and open/close capability of miniaturized wireless soft grippers. It introduces the underlying autonomous magnetic and thermal control systems, their interconnection with the master haptic interface, and an extensive evaluation in two real-world scenarios: following of a predetermined trajectory, and pick-and-place of a microscopic object.
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Affiliation(s)
- C. Pacchierotti
- CNRS at Irisa and Inria Rennes Bretagne Atlantique, Campus de Beaulieu, 35042 Rennes Cedex, France
| | - F. Ongaro
- Surgical Robotics Laboratory, Department of Biomechanical Engineering, MIRA–Institute for Biomedical Technology and Technical Medicine, University of Twente, 7522 NB Enschede, The Netherlands
| | - F. van den Brink
- Surgical Robotics Laboratory, Department of Biomechanical Engineering, MIRA–Institute for Biomedical Technology and Technical Medicine, University of Twente, 7522 NB Enschede, The Netherlands
| | - C. Yoon
- Department of Materials Science and Engineering, The Johns Hopkins University, Baltimore, MD 21218 USA
| | - D. Prattichizzo
- Department of Information Engineering and Mathematics, University of Siena, 53100 Siena, Italy, and also with the Department of Advanced Robotics, Istituto Italiano di Tecnologia, 16163 Genoa, Italy
| | - D. H. Gracias
- Department of Materials Science and Engineering, The Johns Hopkins University, Baltimore, MD 21218 USA
- Department of Chemical and Biomolecular Engineering, The Johns Hopkins University, Baltimore, MD 21218 USA
| | - S. Misra
- Surgical Robotics Laboratory, Department of Biomechanical Engineering, MIRA–Institute for Biomedical Technology and Technical Medicine, University of Twente, 7522 NB Enschede, The Netherlands
- Department of Biomedical Engineering, University Medical Centre Groningen, University of Groningen, 9713 GZ Groningen, The Netherlands
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Ahn S, Cha Y, Yoon C, Bae S, Kim J, Jeong J. Comparisons of tumor-infiltrating lymphocytes and 21-gene recurrence score in ER-positive/HER2-negative breast cancer. Ann Oncol 2017. [DOI: 10.1093/annonc/mdx362.044] [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: 11/14/2022] Open
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Suarez-Farinas M, Devi K, Dannenfelser R, Izar B, Prakadan S, Zhu Q, Yoon C, Regev A, Garraway L, Shalek A, Troyansakaya O, Anandasabapathy N. 065 Highly conserved tissue immune signatures are co-opted in cancer. J Invest Dermatol 2017. [DOI: 10.1016/j.jid.2017.02.078] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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Devi K, Melssen M, Tirosh I, Izar B, Olson W, Engelhard V, Slingluff C, Regev A, Garraway L, Kupper T, Yoon C, Suarez-Farinas M, Anandasabapathy N. 062 Human melanoma TILs share phenotypic and transcriptional properties with tissue resident memory T cells. J Invest Dermatol 2017. [DOI: 10.1016/j.jid.2017.02.075] [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: 11/28/2022]
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Abstract
OBJECTIVES We evaluated the accuracy of augmented reality (AR)-based navigation assistance through simulation of bone tumours in a pig femur model. METHODS We developed an AR-based navigation system for bone tumour resection, which could be used on a tablet PC. To simulate a bone tumour in the pig femur, a cortical window was made in the diaphysis and bone cement was inserted. A total of 133 pig femurs were used and tumour resection was simulated with AR-assisted resection (164 resection in 82 femurs, half by an orthropaedic oncology expert and half by an orthopaedic resident) and resection with the conventional method (82 resection in 41 femurs). In the conventional group, resection was performed after measuring the distance from the edge of the condyle to the expected resection margin with a ruler as per routine clinical practice. RESULTS The mean error of 164 resections in 82 femurs in the AR group was 1.71 mm (0 to 6). The mean error of 82 resections in 41 femurs in the conventional resection group was 2.64 mm (0 to 11) (p < 0.05, one-way analysis of variance). The probabilities of a surgeon obtaining a 10 mm surgical margin with a 3 mm tolerance were 90.2% in AR-assisted resections, and 70.7% in conventional resections. CONCLUSION We demonstrated that the accuracy of tumour resection was satisfactory with the help of the AR navigation system, with the tumour shown as a virtual template. In addition, this concept made the navigation system simple and available without additional cost or time.Cite this article: H. S. Cho, Y. K. Park, S. Gupta, C. Yoon, I. Han, H-S. Kim, H. Choi, J. Hong. Augmented reality in bone tumour resection: An experimental study. Bone Joint Res 2017;6:137-143.
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Affiliation(s)
- H S Cho
- Department of Orthopaedic Surgery, Seoul National University Bundang Hospital, Seoul National University College of Medicine, Seoul, South Korea
| | - Y K Park
- Department of Orthopaedic Surgery, Seoul National University Bundang Hospital, Seoul National University College of Medicine, Seoul, South Korea
| | - S Gupta
- Division of Orthopaedic Surgery, Glasgow Royal Infirmary, 84 Castle Street, Glasgow, G4 0SF, UK
| | - C Yoon
- Department of Orthopaedic Surgery, Seoul National University Hospital, Seoul National University College of Medicine, Seoul, South Korea
| | - I Han
- Department of Orthopaedic Surgery, Seoul National University Hospital, Seoul National University College of Medicine, Seoul, South Korea
| | - H-S Kim
- Department of Orthopaedic Surgery, Seoul National University Hospital, Seoul National University College of Medicine, Seoul, South Korea
| | - H Choi
- Department of Robotics Engineering, Daegu Gyeongbuk Institute of Science and Technology (DGIST), Daegu, South Korea
| | - J Hong
- Department of Robotics Engineering, Daegu Gyeongbuk Institute of Science and Technology (DGIST), Daegu, South Korea
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Hao Y, Frey E, Yoon C, Wong H, Nestorovski D, Holzman LB, Giger RJ, DiAntonio A, Collins C. An evolutionarily conserved mechanism for cAMP elicited axonal regeneration involves direct activation of the dual leucine zipper kinase DLK. eLife 2016; 5. [PMID: 27268300 PMCID: PMC4896747 DOI: 10.7554/elife.14048] [Citation(s) in RCA: 42] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/29/2015] [Accepted: 05/12/2016] [Indexed: 11/13/2022] Open
Abstract
A broadly known method to stimulate the growth potential of axons is to elevate intracellular levels of cAMP, however the cellular pathway(s) that mediate this are not known. Here we identify the Dual Leucine-zipper Kinase (DLK, Wnd in Drosophila) as a critical target and effector of cAMP in injured axons. DLK/Wnd is thought to function as an injury ‘sensor’, as it becomes activated after axonal damage. Our findings in both Drosophila and mammalian neurons indicate that the cAMP effector kinase PKA is a conserved and direct upstream activator of Wnd/DLK. PKA is required for the induction of Wnd signaling in injured axons, and DLK is essential for the regenerative effects of cAMP in mammalian DRG neurons. These findings link two important mediators of responses to axonal injury, DLK/Wnd and cAMP/PKA, into a unified and evolutionarily conserved molecular pathway for stimulating the regenerative potential of injured axons. DOI:http://dx.doi.org/10.7554/eLife.14048.001 Adult mammals typically cannot repair damage to the nerve fibers in their brain or spinal cord. This is because these nerve cells cannot generally grow new nerve fibers. However this inability to regenerate nerve fibers is not set in stone. Instead, it can be unlocked by a second injury in nerves elsewhere in the body, the so-called “peripheral nervous system”. This process relies on an enzyme called DLK, which becomes activated in damaged nerve fibers. But how does DLK ‘sense’ damage to nerve fibers? Injuring the peripheral nervous system causes the levels of a molecule called cAMP to increase in the damaged nerve cells, and the elevated cAMP levels stimulate the nerve fibers to regenerate. However, it was not known if cAMP activates DLK, or if the two act independently of each other. By looking at the regeneration of damaged nerve fibers in fruit fly larvae, Hao et al. now show that the cAMP and DLK signaling pathways are clearly linked. Further experiments with nerve cells from mice and human cells revealed more detail about this link. Together the results showed that another enzyme called PKA activates DLK directly when cAMP levels are high. These findings reveal a unified pathway that is the key to unlocking the regenerative potential of injured nerve fibers, which has been conserved for hundreds of millions of years of evolution. Further work could now ask if the DLK enzyme is involved in the other known roles of cAMP signaling in nerve cells; or if cAMP and PKA activate DLK in other forms of nerve damage, including injuries where nerve fibers normally fail to regenerate. DOI:http://dx.doi.org/10.7554/eLife.14048.002
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Affiliation(s)
- Yan Hao
- Department of Molecular Cellular and Developmental Biology, University of Michigan, Ann Arbor, United States
| | - Erin Frey
- Department of Developmental Biology, Washington University School of Medicine, St. Louis, United States
| | - Choya Yoon
- Department of Cell and Developmental Biology, University of Michigan, Ann Arbor, United States
| | - Hetty Wong
- Perelman School of Medicine, University of Pennsylvania, Philadelphia, United States
| | - Douglas Nestorovski
- Department of Molecular Cellular and Developmental Biology, University of Michigan, Ann Arbor, United States
| | - Lawrence B Holzman
- Perelman School of Medicine, University of Pennsylvania, Philadelphia, United States
| | - Roman J Giger
- Department of Cell and Developmental Biology, University of Michigan, Ann Arbor, United States.,Department of Neurology, University of Michigan School of Medicine, Ann Arbor, United States
| | - Aaron DiAntonio
- Department of Developmental Biology, Washington University School of Medicine, St. Louis, United States
| | - Catherine Collins
- Department of Molecular Cellular and Developmental Biology, University of Michigan, Ann Arbor, United States
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Kim Y, Yoon C, Seong N, Lee H, An S, Woo Y. Cryptogenic hemoptysis: bronchial artery embolization using N-butyl-cyanoacrylate. J Vasc Interv Radiol 2016. [DOI: 10.1016/j.jvir.2015.12.158] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022] Open
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Kim Y, Yoon C, Seong N, An S, Woo Y. Spontaneous isolated dissection of superior mesenteric artery: a long-term outcome after endovascular stent placement. J Vasc Interv Radiol 2016. [DOI: 10.1016/j.jvir.2015.12.307] [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: 11/17/2022] Open
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Rha J, Park H, Yoon C, Kwon J, Kim S, Lee E, Oh D. Clinical characteristics of stroke patients with essential thrombocytosis according to Jak2 mutation. J Neurol Sci 2015. [DOI: 10.1016/j.jns.2015.08.1434] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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25
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Choi S, Yoon B, Yoon C, Kwon J, Jeong J, Park M, Yoon B. Dietary patterns and conversion from amnestic mild cognitive impairment to dementia: a credos study. J Neurol Sci 2015. [DOI: 10.1016/j.jns.2015.08.398] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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Cho Y, Jeon K, Park J, Yoon C, Suh J, Youn T, Chae I, Choi D. Evolution of non-culprit coronary atherosclerotic plaques assessed by serial virtual histology-intravascular ultrasound in st-segment elevation myocardial infarction and chronic total occlusion. Atherosclerosis 2015. [DOI: 10.1016/j.atherosclerosis.2015.04.831] [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: 10/23/2022]
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Yoon C, Van Niekerk EA, Henry K, Ishikawa T, Orita S, Tuszynski MH, Campana WM. Low-density lipoprotein receptor-related protein 1 (LRP1)-dependent cell signaling promotes axonal regeneration. J Biol Chem 2013; 288:26557-68. [PMID: 23867460 DOI: 10.1074/jbc.m113.478552] [Citation(s) in RCA: 37] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023] Open
Abstract
Low-density lipoprotein receptors (LRPs) are present extensively on cells outside of the nervous system and classically exert roles in lipoprotein metabolism. It has been reported recently that LRP1 activation could phosphorylate the neurotrophin receptor TrkA in PC12 cells and increase neurite outgrowth from developing cerebellar granule cells. These intriguing findings led us to explore the hypothesis that LRP1 activation would activate canonical neurotrophic factor signaling in adult neurons and promote axonal regeneration after spinal cord injury. We now find that treatment of adult rat dorsal root ganglion neurons in vitro with LRP1 agonists (the receptor binding domain of α-2-macroglobulin or the hemopexin domain of matrix metalloproteinase 9) induces TrkC, Akt, and ERK activation; significantly increases neurite outgrowth (p < 0.01); and overcomes myelin inhibition (p < 0.05). These effects require Src family kinase activation, a classic LRP1-mediated Trk transactivator. Moreover, intrathecal infusions of LRP1 agonists significantly enhance sensory axonal sprouting and regeneration after spinal cord injury in rats compared with control-infused animals (p < 0.05). A significant role is established for lipoprotein receptors in sprouting and regeneration after CNS injury, identifying a novel class of therapeutic targets to explore for traumatic neurological disorders.
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Affiliation(s)
- Choya Yoon
- From the Departments of Neurosciences and
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Kim Y, Yoon C, Seong N, Woo Y, Kim Y. Abstract No. 259: Pelvic arterial embolization in treatment of postpartum hemorrhage: clinical outcomes and predictive factor for failed embolization. J Vasc Interv Radiol 2012. [DOI: 10.1016/j.jvir.2011.12.312] [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] Open
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An S, Yoon C, Woo Y, Seong N, Kim Y, Kim Y, Park J. Abstract No. 384: Inaccessible postoperative abdominal abscess: a new percutaneous drainage technique. J Vasc Interv Radiol 2012. [DOI: 10.1016/j.jvir.2011.12.442] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022] Open
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Kang S, Kim S, Kang T, Yoon C, Ko S, Hur M, Lee H, Seol C. 528 Short-term Outcomes of Immediate Breast Reconstruction After Mastectomy Using Implant or Tissue Expander in Patients with Breast Cancer. Eur J Cancer 2012. [DOI: 10.1016/s0959-8049(12)70593-2] [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]
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31
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Yoon C, Tuszynski MH. Frontiers of spinal cord and spine repair: experimental approaches for repair of spinal cord injury. Adv Exp Med Biol 2012; 760:1-15. [PMID: 23281510 DOI: 10.1007/978-1-4614-4090-1_1] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
Regeneration of injured CNS neurons was once thought to be an unachievable goal. Most patients with significant damage to the spinal cord suffer from permanently impaired neurological function. A century of research, however, has led to an understanding of multiple factors that limit CNS regeneration and from this knowledge experimental strategies have emerged for enhancing CNS repair. Some of these approaches have undergone human translation. Nevertheless, translating experimental findings to human trials has been more challenging than anticipated. In this chapter, we will review the current state of knowledge regarding central axonal growth failure after injury, and approaches taken to enhance recovery after SCI.
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Affiliation(s)
- Choya Yoon
- Department of Neurosciences, University of California San Diego, La Jolla, California, USA.
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Kim T, Park C, Nam J, Yoon C. UP-02.021 Influence of Preoperative Variables on the Outcome of Holmium Laser Enucleation of the Prostate. Urology 2011. [DOI: 10.1016/j.urology.2011.07.839] [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: 12/01/2022]
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Kaushal R, Goldmann DA, Keohane CA, Abramson EL, Woolf S, Yoon C, Zigmont K, Bates DW. Medication errors in paediatric outpatients. BMJ Qual Saf 2010; 19:e30. [DOI: 10.1136/qshc.2008.031179] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022]
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Kim YT, Yoon HO, Yoon C, Woo NC. Arsenic species in ecosystems affected by arsenic-rich spring water near an abandoned mine in Korea. Environ Pollut 2009; 157:3495-3501. [PMID: 19596161 DOI: 10.1016/j.envpol.2009.06.014] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/15/2008] [Revised: 06/09/2009] [Accepted: 06/10/2009] [Indexed: 05/28/2023]
Abstract
The objectives of this study were to quantitatively estimate the distribution of arsenic with its speciation and to identify potential pathways for transformation of arsenic species from samples of water, sediments, and plants in the ecosystem affected by the Cheongog Spring, where As(V) concentration reached levels up to 0.270 mg L(-1). After flowing about 100 m downstream, the arsenic level showed a marked reduction to 0.044 mg L(-1) (about 84% removal) without noticeable changes in major water chemistry. The field study and laboratory hydroponic experiments with the dominant emergent plants along the creek (water dropwort and thunbergian smartweed) indicated that arsenic distribution, reduction, and speciation appear to be controlled by, (i) sorption onto stream sediments in exchangeable fractions, (ii) bioaccumulation by and possible release from emergent plants, and (iii) transformation of As(V) to As(III) and organic species through biological activities.
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Affiliation(s)
- Y T Kim
- Department of Earth System Science, Yonsei University, 134 Shinchon-Dong, Sudaemoon-Gu, Seoul 120-749, Republic of Korea
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Jeong S, Doo S, Park H, Yoon C, Hong S, Byun S, Lee S. MP-17.12: A Study of Factors Predicting Female Bladder Outlet Obstruction Defined Using Pressure-flow Study. Urology 2009. [DOI: 10.1016/j.urology.2009.07.813] [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]
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Jeong S, Doo S, Park H, Yoon C, Hong S, Byun S, Lee S. UP-1.185: Urodynamic Comparison Between Complete and Incomplete Injury in Patients with Spinal Cord Injury: Can Urodynamic Study be Skipped in a Patient With Incomplete Injury? Urology 2009. [DOI: 10.1016/j.urology.2009.07.632] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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Lee S, Hong S, Yoon C, Jeong S, Byun S, Park H, Doo S, Lee W, Kim D. UP-2.142: Impact of Bony Pelvic Dimensions on Performing Robot-Assisted Laparoscopic Prostatectomy. Urology 2009. [DOI: 10.1016/j.urology.2009.07.361] [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]
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39
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Yoon C, Yu J, Du S, Park H, Kim S, Jeong S, Hong S, Byun S, Lee S. UP-3.007: Histone Deacetylase Inhibitor Trichostatin A Induces Apoptosis in Human Invasive Bladder Cancer through the Caspase Dependent Pathway. Urology 2009. [DOI: 10.1016/j.urology.2009.07.010] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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Shim KS, Jung HJ, Na CS, Yoon C, Park GH. Effects of Taurine on Lipid Metabolism and Protein Synthesis in Poultry and Mice. Asian Australas J Anim Sci 2009. [DOI: 10.5713/ajas.2009.90024] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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Hur M, Yoon C, Ko S, Lee H, Kim S, Park H, Han A, Kang S. 0213 Clinical characteristics of triple negative breast cancers. Breast 2009. [DOI: 10.1016/s0960-9776(09)70230-9] [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: 10/20/2022] Open
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42
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Yoon C, Song H, Shin J. Abstract No. 375: A Covered, Retrievable Prostate Stent Placement in Hormone-Induced Canine Prostate Hyperplasia: Technical Feasibility and Histologic Changes of the Prostate. J Vasc Interv Radiol 2009. [DOI: 10.1016/j.jvir.2008.12.370] [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] Open
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Chang H, Heo C, Jeong J, Baek R, Minn K, Yoon C. Unilateral buttock reconstruction using contralateral inferior gluteal artery perforator flap with the aid of multi-detector CT. J Plast Reconstr Aesthet Surg 2008; 61:1534-8. [PMID: 17638601 DOI: 10.1016/j.bjps.2006.12.013] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/29/2006] [Revised: 11/27/2006] [Accepted: 12/27/2006] [Indexed: 11/18/2022]
Abstract
SUMMARY The applicability of inferior gluteal artery perforator (IGAP) flaps in breast reconstruction following breast cancer has been well described. However, the use of IGAP flaps in buttock augmentation has not been presented. We present the case of a female patient with buttock asymmetry and a deficiency of volume, who underwent buttock reconstruction based on a contralateral IGAP flap. Multidetector computed tomography (MDCT) was used to study donor and recipient areas, and allowed easy interpretation as it provided anatomical images and three-dimensional anatomy reconstructions. Based on a knowledge of individual anatomical perforating vessel distributions, safe perforator flaps can be designed. Moreover, we are convinced that buttock reconstruction using autologous tissue can be performed in a safe and reliable fashion using perforator flaps. Donor site morbidity was minimal and the muscle at the donor site was preserved. The contralateral buttock proved an excellent donor site for aesthetic unilateral buttock reconstruction and provided ample tissue in the described case.
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Affiliation(s)
- H Chang
- Department of Plastic and Reconstructive Surgery, The College of Medicine, Seoul National University, Chongno-gu, Seoul, South Korea
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Park Y, Kang S, Ko S, Lee H, Hur M, Kim J, Yoon C. Proposal for using an international unified draft for chemotherapeutic regimen time schedule table: Chemo Box. EJC Suppl 2008. [DOI: 10.1016/s1359-6349(08)70344-6] [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: 11/28/2022] Open
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Hur M, Kim J, Yoon C, Ko S, Lee H, Lee J, Kang S. Breast cancer screening in Korea. EJC Suppl 2008. [DOI: 10.1016/s1359-6349(08)70485-3] [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: 10/22/2022] Open
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46
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Yoon C, Kang S, Hong K, Choi H. Abstract No. 339: The Effects of Arsenic Trioxide on Radiofrequncy Ablation: Intraarterial Versus Intervenous Administration. J Vasc Interv Radiol 2008. [DOI: 10.1016/j.jvir.2007.12.390] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022] Open
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47
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Yoon C, Kang S, Choi H. Abstract No. 351: Single-Session Combined Therapy for Hepatocellular Carcinoma. J Vasc Interv Radiol 2008. [DOI: 10.1016/j.jvir.2007.12.404] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022] Open
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Yoon C, Yoon D, Sung D, Lee J, Kim A, Oh C, Je J, Yoon D. UP-03.52. Urology 2006. [DOI: 10.1016/j.urology.2006.08.911] [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: 10/24/2022]
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Waisman D, MacLeod T, Kwon M, Fitzpatrick S, Yoon C, Zhang L. ID: 011 Regulation of cancer cell plasmin generation by annexin A2-S100A10 heterotetramer (AIIt). J Thromb Haemost 2006. [DOI: 10.1111/j.1538-7836.2006.00011.x] [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: 11/28/2022]
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Jeong YI, Shim YH, Kim C, Lim GT, Choi KC, Yoon C. Effect of cryoprotectants on the reconstitution of surfactant-free nanoparticles of poly(DL-lactide-co-glycolide). J Microencapsul 2006; 22:593-601. [PMID: 16401576 DOI: 10.1080/02652040500162659] [Citation(s) in RCA: 41] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
Abstract
Various cryoprotectants were tested to reconstitute the surfactant-free nanoparticles of poly(DL-lactide-co-glycolide) (PLGA). When 2.0% (w/v) of sucrose, trehalose and lactose were used, nanoparticles were completely reconstituted into aqueous solution and particle size was not significantly changed. Above 1.0% (w/v) of sucrose, trehalose and lactose, nanoparticles are well reconstituted whereas it was precipitated with 1.0% (w/v) of mannitol. Drug-encapsulated surfactant-free nanoparticles were quite reconstituted when 2.0% (w/v) of sucrose, trehalose and lactose. Drug release kinetics of nanoparticles was not significantly changed by cryoprotectants.
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Affiliation(s)
- Y-I Jeong
- Faculty of Applied Chemical Engineering, Chonnam National University, Gwangju, Korea.
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