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Tangen K, Nestorov I, Verma A, Sullivan J, Holt RW, Linninger AA. In Vivo Intrathecal Tracer Dispersion in Cynomolgus Monkey Validates Wide Biodistribution Along Neuraxis. IEEE Trans Biomed Eng 2020; 67:1122-1132. [DOI: 10.1109/tbme.2019.2930451] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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Linninger A, Hartung GA, Liu BP, Mirkov S, Tangen K, Lukas RV, Unruh D, James CD, Sarkaria JN, Horbinski C. Modeling the diffusion of D-2-hydroxyglutarate from IDH1 mutant gliomas in the central nervous system. Neuro Oncol 2019; 20:1197-1206. [PMID: 29660019 DOI: 10.1093/neuonc/noy051] [Citation(s) in RCA: 23] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022] Open
Abstract
Background Among diffusely infiltrative gliomas in adults, 20%-30% contain a point mutation in isocitrate dehydrogenase 1 (IDH1mut), which increases production of D-2-hydroxyglutarate (D2HG). This is so efficient that D2HG often reaches 30 mM within IDH1mut gliomas. Yet, while up to 100 µM D2HG can be detected in the circulating cerebrospinal fluid of IDH1mut glioma patients, the exposure of nonneoplastic cells within and surrounding an IDH1mut glioma to D2HG is unknown and difficult to measure directly. Methods Conditioned medium from patient-derived wild type IDH1 (IDH1wt) and IDH1mut glioma cells was analyzed for D2HG by liquid chromatography-mass spectrometry (LC-MS). Mathematical models of D2HG release and diffusion around an IDH1mut glioma were independently generated based on fluid dynamics within the brain and on previously reported intratumoral and cerebrospinal D2HG concentrations. Results LC-MS analysis indicates that patient-derived IDH1mut glioma cells release 3.7-97.0 pg D2HG per cell per week. Extrapolating this to an average-sized tumor (30 mL glioma volume and 1 × 108 cells/mL tumor), the rate of D2HG release by an IDH1mut glioma (SA) is estimated at 3.2-83.0 × 10-12 mol/mL/sec. Mathematical models estimate an SA of 2.9-12.9 × 10-12 mol/mL/sec, within the range of the in vitro LC-MS data. In even the most conservative of these models, the extracellular concentration of D2HG exceeds 3 mM within a 2 cm radius from the center of an IDH1mut glioma. Conclusions The microenvironment of an IDH1mut glioma is likely being exposed to high concentrations of D2HG, in the low millimolar range. This has implications for understanding how D2HG affects nonneoplastic cells in an IDH1mut glioma.
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Affiliation(s)
- Andreas Linninger
- Department of Bioengineering, University of Illinois at Chicago, Chicago, Illinois.,Department of Neurosurgery, University of Illinois at Chicago, Chicago, Illinois
| | - Grant A Hartung
- Department of Neurosurgery, University of Illinois at Chicago, Chicago, Illinois
| | - Benjamin P Liu
- Department of Radiology, Northwestern University, Chicago, Illinois
| | - Snezana Mirkov
- Department of Neurological Surgery, Northwestern University, Chicago, Illinois
| | - Kevin Tangen
- Department of Neurosurgery, University of Illinois at Chicago, Chicago, Illinois
| | - Rimas V Lukas
- Department of Neurology, Northwestern University, Chicago, Illinois
| | - Dusten Unruh
- Department of Neurological Surgery, Northwestern University, Chicago, Illinois
| | - C David James
- Department of Neurological Surgery, Northwestern University, Chicago, Illinois
| | | | - Craig Horbinski
- Department of Neurological Surgery, Northwestern University, Chicago, Illinois.,Department of Pathology, Northwestern University, Chicago, Illinois
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Sane A, Tangen K, Frim D, Singh MR, Linninger A. Cellular Obstruction Clearance in Proximal Ventricular Catheters Using Low-Voltage Joule Heating. IEEE Trans Biomed Eng 2018; 65:2503-2511. [DOI: 10.1109/tbme.2018.2802418] [Citation(s) in RCA: 1] [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: 11/09/2022]
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Abstract
AIM To quantify the exchange of water between cerebral compartments, specifically blood, tissue, perivascular pathways, and cerebrospinal fluid-filled spaces, on the basis of experimental data and to propose a dynamic global model of water flux through the entire brain to elucidate functionally relevant fluid exchange phenomena. METHODS The mechanistic computer model to predict brain water shifts is discretized by cerebral compartments into nodes. Water and species flux is calculated between these nodes across a network of arcs driven by Hagen-Poiseuille flow (blood), Darcy flow (interstitial fluid transport), and Starling's Law (transmembrane fluid exchange). Compartment compliance is accounted for using a pressure-volume relationship to enforce the Monro-Kellie doctrine. This nonlinear system of differential equations is solved implicitly using MATLAB software. RESULTS The model predictions of intraventricular osmotic injection caused a pressure rise from 10 to 22 mmHg, followed by a taper to 14 mmHg over 100 minutes. The computational results are compared to experimental data with R2=0.929. Moreover, simulated osmotic therapy of systemic (blood) injection reduced intracranial pressure from 25 to 10 mmHg. The modeled volume and intracranial pressure changes following cerebral edema agree with experimental trends observed in animal models with R2=0.997. CONCLUSION The model successfully predicted time course and the efficacy of osmotic therapy for clearing cerebral edema. Furthermore, the mathematical model implicated the perivascular pathways as a possible conduit for water and solute exchange. This was a first step to quantify fluid exchange throughout the brain.
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Affiliation(s)
- Andreas A Linninger
- Andreas A. Linninger, Department of Bioengineering, Neurosurgery, University of Illinois at Chicago, 851 S Morgan St, Chicago, IL 60607, USA,
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Adnan AK, Alexopoulos A, Alo KM, Alterman RL, Amar A, Andrade P, Arulkumar S, Awad AJ, Baltuch G, Barolat G, Barthélemy EJ, Barua NU, Bennett ME, Bentley N, Bezchlibnyk YB, Bijanki KR, Bingaman W, Boggs JW, Boon P, Brouwer BA, Campos LW, Caparso A, Capozzo A, Chae J, Chang JW, Cheng J, Copenhaver D, Deer TR, Deogaonkar M, Dhar D, Dohmeier K, Dougherty DD, Durand DM, Foote K, Gilligan J, Gill SS, Gonzalez-Martinez J, Greenberg BD, Gross RE, H. Pourfar M, Hamani C, Hayek SM, Holtzheimer PE, Ilfeld BM, Jin H, Joosten B, Jung NY, Kim CH, Kim YG, Klehr M, Koch P, Kohl S, Kopell BH, Kramer D, Krames ES, Krishnan B, Krishna V, Kuhn J, Kyung-soo Hong J, Leonardo K, Leong MS, Li D, Linninger AA, Lipsman N, Liu C, Lozano AM, Mackow M, Malinowski MN, Mayberg HS, Mazzone P, Mehta AI, Mehta V, Mills-Joseph R, Nair D, North RB, Okun M, Patel NK, Patil PG, Pope JE, Poree LR, Prager JP, Raedt R, Rasouli JJ, Rasskazoff S, Rauck R, Reeves K, Rezai AR, Russin J, Sabersky A, Saulino M, Scarnati E, Schu S, Sharma M, Shipley J, Shirvalkar P, Slavin KV, Stanton-Hicks M, Stone S, Stuart WA, Sun B, Tangen K, Tepper SJ, van Kleef M, Vancamp T, Verrills P, Viselli F, Visser-Vandewalle V, Vitale F, Vonck K, Wang T, Wang X, Weiner RL, Widge AS, Wongsarnpigoon A, Y. Mogilner A, Yaeger KA, Yaksh TL, Yin D, Zeljic K, Zhang C, Zhan S. List of Contributors of Volume 2. Neuromodulation 2018. [DOI: 10.1016/b978-0-12-805353-9.01005-6] [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: 10/17/2022]
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Horbinski C, Hartung G, Liu B, Mirkov S, Tangen K, Unruh D, Sarkaria J, Linninger A. TMIC-45. DIFFUSION OF D-2-HYDROXYGLUTARATE FROM IDH1 MUTANT GLIOMAS IN THE BRAIN. Neuro Oncol 2017. [DOI: 10.1093/neuonc/nox168.1033] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
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Ghaffari M, Tangen K, Alaraj A, Du X, Charbel FT, Linninger AA. Large-scale subject-specific cerebral arterial tree modeling using automated parametric mesh generation for blood flow simulation. Comput Biol Med 2017; 91:353-365. [PMID: 29126049 DOI: 10.1016/j.compbiomed.2017.10.028] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/18/2017] [Revised: 10/23/2017] [Accepted: 10/23/2017] [Indexed: 10/18/2022]
Abstract
In this paper, we present a novel technique for automatic parametric mesh generation of subject-specific cerebral arterial trees. This technique generates high-quality and anatomically accurate computational meshes for fast blood flow simulations extending the scope of 3D vascular modeling to a large portion of cerebral arterial trees. For this purpose, a parametric meshing procedure was developed to automatically decompose the vascular skeleton, extract geometric features and generate hexahedral meshes using a body-fitted coordinate system that optimally follows the vascular network topology. To validate the anatomical accuracy of the reconstructed vasculature, we performed statistical analysis to quantify the alignment between parametric meshes and raw vascular images using receiver operating characteristic curve. Geometric accuracy evaluation showed an agreement with area under the curves value of 0.87 between the constructed mesh and raw MRA data sets. Parametric meshing yielded on-average, 36.6% and 21.7% orthogonal and equiangular skew quality improvement over the unstructured tetrahedral meshes. The parametric meshing and processing pipeline constitutes an automated technique to reconstruct and simulate blood flow throughout a large portion of the cerebral arterial tree down to the level of pial vessels. This study is the first step towards fast large-scale subject-specific hemodynamic analysis for clinical applications.
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Affiliation(s)
- Mahsa Ghaffari
- Department of Bioengineering, University of Illinois at Chicago, Chicago, IL, USA
| | - Kevin Tangen
- Department of Bioengineering, University of Illinois at Chicago, Chicago, IL, USA
| | - Ali Alaraj
- Department of Bioengineering, University of Illinois at Chicago, Chicago, IL, USA; Department of Neurosurgery, University of Illinois at Chicago, Chicago, IL, USA
| | - Xinjian Du
- Department of Neurosurgery, University of Illinois at Chicago, Chicago, IL, USA
| | - Fady T Charbel
- Department of Neurosurgery, University of Illinois at Chicago, Chicago, IL, USA
| | - Andreas A Linninger
- Department of Bioengineering, University of Illinois at Chicago, Chicago, IL, USA; Department of Neurosurgery, University of Illinois at Chicago, Chicago, IL, USA.
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Lueshen E, Tangen K, Mehta AI, Linninger A. Backflow-free catheters for efficient and safe convection-enhanced delivery of therapeutics. Med Eng Phys 2017; 45:15-24. [DOI: 10.1016/j.medengphy.2017.02.018] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/16/2015] [Revised: 02/15/2017] [Accepted: 02/26/2017] [Indexed: 10/19/2022]
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Tangen K, Narasimhan NS, Sierzega K, Preden T, Alaraj A, Linninger AA. Clearance of Subarachnoid Hemorrhage from the Cerebrospinal Fluid in Computational and In Vitro Models. Ann Biomed Eng 2016; 44:3478-3494. [DOI: 10.1007/s10439-016-1681-8] [Citation(s) in RCA: 14] [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: 01/26/2016] [Accepted: 06/18/2016] [Indexed: 12/30/2022]
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Basati S, Tangen K, Ying Hsu, Lin H, Frim D, Linninger A. Impedance Changes Indicate Proximal Ventriculoperitoneal Shunt Obstruction In Vitro. IEEE Trans Biomed Eng 2015; 62:2787-93. [DOI: 10.1109/tbme.2014.2335171] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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Dubelaar GB, Gerritzen PL, Beeker AE, Jonker RR, Tangen K. Design and first results of CytoBuoy: a wireless flow cytometer for in situ analysis of marine and fresh waters. Cytometry 1999; 37:247-54. [PMID: 10547609] [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: 02/14/2023]
Abstract
BACKGROUND The high costs of microscopical determination and counting of phytoplankton often limit sampling frequencies below an acceptable level for the monitoring of dynamic ecosystems. Although having a limited discrimination power, flow cytometry allows the analysis of large numbers of samples to a level that is sufficient for many basic monitoring jobs. For this purpose, flow cytometers should not be restricted to research laboratories. We report here on the development of an in situ flow cytometer for autonomous operation inside a small moored buoy or on other platforms. METHODS AND RESULTS Operational specifications served a wide range of applications in the aquatic field. Specific conditions had to be met with respect to the operation platform and autonomy. A small, battery-operated flow cytometer resulted, requiring no external sheath fluid supply. Because it was designed to operate in a buoy, we call it CytoBuoy. Sampling, analysis, and radio transmission of the data proceed automatically at user-defined intervals. A powerful feature is the acquisition and radio transmission of full detector pulse shapes of each particle. This provides valuable morphological information for particles larger than the 5-microm laser focus. CONCLUSIONS CytoBuoy allows on-line in situ particle analysis, estimation of phytoplankton biomass, and discrimination between different phytoplankton groups. This will increase the applicability of flow cytometry in the field of environmental monitoring.
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Affiliation(s)
- G B Dubelaar
- Dubelaar Research Instruments Engineering, Bodegraven, The Netherlands.
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Høiseth A, Tangen K. [On reproducibility and per cents]. Tidsskr Nor Laegeforen 1991; 111:2007. [PMID: 1866744] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022] Open
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