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Smith MA, McNinch NL, Chaney D, Shauver L, Murray T, Kline P, Lesak A, Franco-MacKendrick L, Scott L, Logan K, Ichesco IK, Liebig C, Congeni J. Reduced Concussion Symptom Burden in Early Adolescent Athletes Using a Head-Neck Cooling Device. Clin J Sport Med 2024; 34:247-255. [PMID: 38180057 PMCID: PMC11042520 DOI: 10.1097/jsm.0000000000001198] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/06/2023] [Accepted: 11/02/2023] [Indexed: 01/06/2024]
Abstract
OBJECTIVE To determine whether an investigational head-neck cooling device, Pro2cool, can better reduce symptom severity compared with standard postconcussion care in early adolescent athletes after a sports-related concussion. DESIGN Prospective, longitudinal, randomized trial design conducted over a 28-day period. SETTING Six pediatric medical centers in Ohio and Michigan. PARTICIPANTS The study enrolled 167 male and female 12- to 19-year-old athletes who experienced a sports-related concussion within 8 days of study enrollment and registering a Sports Concussion Assessment Tool 5 (SCAT5) composite score >7. INTERVENTIONS Pro2cool, an investigational head-neck cooling therapy device, was applied at 2 postinjury time points compared with postconcussion standard of care only. MAIN OUTCOME MEASURES Baseline SCAT5 composite symptom severity scores were determined for all subjects. Sports Concussion Assessment Tool 5 scores for concussed athletes receiving cooling treatment were analyzed across 6 independent postenrollment time points compared with subjects who did not receive cooling therapy and only standard care. Adverse reactions and participate demographics were also compared. RESULTS Athletes who received Pro2cool cooling therapy (n = 79) experienced a 14.4% greater reduction in SCAT5 symptom severity scores at the initial visit posttreatment, a 25.5% greater reduction at the 72-hour visit posttreatment, and a 3.4% greater reduction at the 10-day visit compared with subjects receiving only standard care (n = 88). Overall, 36 adverse events (increased blood pressure, decreased pulse, and dizziness) were reported, with 13 events associated with the device, of which 3 were classified as moderate in severity. CONCLUSIONS This study demonstrates the efficacy and safety of head and neck cooling for the management of concussion symptoms in adolescent athletes of an age group for which little to no prior data are available.
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Affiliation(s)
- Matthew A. Smith
- Rebecca D. Considine Research Institute, Akron Children's Hospital, Akron, Ohio
- Department of Pharmaceutical Sciences, Northeast Ohio Medical University, Rootstown, Ohio
| | - Neil L. McNinch
- Rebecca D. Considine Research Institute, Akron Children's Hospital, Akron, Ohio
| | - Danielle Chaney
- Rebecca D. Considine Research Institute, Akron Children's Hospital, Akron, Ohio
| | - Lisa Shauver
- Rebecca D. Considine Research Institute, Akron Children's Hospital, Akron, Ohio
| | - Tamara Murray
- Department of Sports Medicine, Akron Children's Hospital, Akron, Ohio
| | - Peyton Kline
- Rebecca D. Considine Research Institute, Akron Children's Hospital, Akron, Ohio
| | - Alexandria Lesak
- Rebecca D. Considine Research Institute, Akron Children's Hospital, Akron, Ohio
| | | | - Lora Scott
- Department of Sports Medicine, Dayton Children's Hospital, Dayton Ohio
| | - Kelsey Logan
- Division of Sports Medicine, Cincinnati Children's Hospital, Cincinnati, Ohio; and
| | - Ingrid K. Ichesco
- Department of Pediatrics, University of Michigan, Ann Arbor, Michigan
| | | | - Joseph Congeni
- Department of Sports Medicine, Akron Children's Hospital, Akron, Ohio
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Liu X, Xin DE, Zhong X, Zhao C, Li Z, Zhang L, Dourson AJ, Lee L, Mishra S, Bayat AE, Nicholson E, Seibel WL, Yan B, Mason J, Turner BJ, Gonsalvez DG, Ong W, Chew SY, Ghosh B, Yoon SO, Xin M, He Z, Tchieu J, Wegner M, Nave KA, Franklin RJM, Dutta R, Trapp BD, Hu M, Smith MA, Jankowski MP, Barton SK, He X, Lu QR. Small-molecule-induced epigenetic rejuvenation promotes SREBP condensation and overcomes barriers to CNS myelin regeneration. Cell 2024:S0092-8674(24)00400-8. [PMID: 38701782 DOI: 10.1016/j.cell.2024.04.005] [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: 05/31/2023] [Revised: 01/01/2024] [Accepted: 04/04/2024] [Indexed: 05/05/2024]
Abstract
Remyelination failure in diseases like multiple sclerosis (MS) was thought to involve suppressed maturation of oligodendrocyte precursors; however, oligodendrocytes are present in MS lesions yet lack myelin production. We found that oligodendrocytes in the lesions are epigenetically silenced. Developing a transgenic reporter labeling differentiated oligodendrocytes for phenotypic screening, we identified a small-molecule epigenetic-silencing-inhibitor (ESI1) that enhances myelin production and ensheathment. ESI1 promotes remyelination in animal models of demyelination and enables de novo myelinogenesis on regenerated CNS axons. ESI1 treatment lengthened myelin sheaths in human iPSC-derived organoids and augmented (re)myelination in aged mice while reversing age-related cognitive decline. Multi-omics revealed that ESI1 induces an active chromatin landscape that activates myelinogenic pathways and reprograms metabolism. Notably, ESI1 triggered nuclear condensate formation of master lipid-metabolic regulators SREBP1/2, concentrating transcriptional co-activators to drive lipid/cholesterol biosynthesis. Our study highlights the potential of targeting epigenetic silencing to enable CNS myelin regeneration in demyelinating diseases and aging.
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Affiliation(s)
- Xuezhao Liu
- Department of Pediatrics, Division of Experimental Hematology and Cancer Biology, Cincinnati Children's Hospital Medical Center, Cincinnati, OH, USA
| | - Dazhuan Eric Xin
- Department of Pediatrics, Division of Experimental Hematology and Cancer Biology, Cincinnati Children's Hospital Medical Center, Cincinnati, OH, USA
| | - Xiaowen Zhong
- Department of Pediatrics, Division of Experimental Hematology and Cancer Biology, Cincinnati Children's Hospital Medical Center, Cincinnati, OH, USA; Division of Pharmaceutical Sciences, James L. Winkle College of Pharmacy, University of Cincinnati, Cincinnati, Ohio, 45229, USA
| | - Chuntao Zhao
- Department of Pediatrics, Division of Experimental Hematology and Cancer Biology, Cincinnati Children's Hospital Medical Center, Cincinnati, OH, USA
| | - Zhidan Li
- Center for Translational Medicine, Key Laboratory of Birth Defects and Related Disease of Women and Children of MOE, State Key Laboratory of Biotherapy, West China Second University Hospital, Sichuan University, Chengdu, Sichuan, P.R. China
| | - Liguo Zhang
- Department of Pediatrics, Division of Experimental Hematology and Cancer Biology, Cincinnati Children's Hospital Medical Center, Cincinnati, OH, USA
| | - Adam J Dourson
- Department of Anesthesia, Division of Pain Management, Cincinnati Children's Hospital Medical Center, Cincinnati, OH, USA
| | - Lindsay Lee
- Department of Quantitative Health Sciences, Lerner Research Institute, Cleveland Clinic Foundation, Case Western Reserve University School of Medicine, Cleveland, OH, USA
| | - Shreya Mishra
- Department of Quantitative Health Sciences, Lerner Research Institute, Cleveland Clinic Foundation, Case Western Reserve University School of Medicine, Cleveland, OH, USA
| | - Arman E Bayat
- Department of Pediatrics, Division of Experimental Hematology and Cancer Biology, Cincinnati Children's Hospital Medical Center, Cincinnati, OH, USA
| | - Eva Nicholson
- Department of Pediatrics, Division of Experimental Hematology and Cancer Biology, Cincinnati Children's Hospital Medical Center, Cincinnati, OH, USA
| | - William L Seibel
- Department of Pediatrics, Division of Experimental Hematology and Cancer Biology, Cincinnati Children's Hospital Medical Center, Cincinnati, OH, USA
| | - Bingfang Yan
- Division of Pharmaceutical Sciences, James L. Winkle College of Pharmacy, University of Cincinnati, Cincinnati, Ohio, 45229, USA
| | - Joel Mason
- Florey Institute of Neuroscience and Mental Health, University of Melbourne, Melbourne 3052, Australia
| | - Bradley J Turner
- Florey Institute of Neuroscience and Mental Health, University of Melbourne, Melbourne 3052, Australia
| | - David G Gonsalvez
- Department of Anatomy and Developmental Biology, Monash University, Melbourne 3168, Australia
| | - William Ong
- School of Chemistry, Chemical Engineering, and Biotechnology Nanyang Technological University, Singapore 637459, Singapore
| | - Sing Yian Chew
- School of Chemistry, Chemical Engineering, and Biotechnology Nanyang Technological University, Singapore 637459, Singapore; Lee Kong Chian School of Medicine, School of Materials Science and Engineering, Nanyang Technological University, Singapore 639798, Singapore
| | - Balaram Ghosh
- Epigenetic Research Laboratory, Department of Pharmacy, Birla Institute of Technology and Science-Pilani Hyderabad Campus, Shamirpet, Hyderabad, India, 500078
| | - Sung Ok Yoon
- Department of Biological Chemistry and Pharmacology, Ohio State University, Columbus, Ohio
| | - Mei Xin
- Department of Pediatrics, Division of Experimental Hematology and Cancer Biology, Cincinnati Children's Hospital Medical Center, Cincinnati, OH, USA
| | - Zhigang He
- F.M. Kirby Neurobiology Center, Boston Children's Hospital, and Department of Neurology and Ophthalmology, Harvard Medical School, Boston, MA, USA
| | - Jason Tchieu
- Department of Pediatrics, Division of Developmental Biology, Cincinnati Children's Hospital Medical Center, Cincinnati, OH, USA
| | - Michael Wegner
- Institut für Biochemie, Friedrich-Alexander-Universität Erlangen-Nürnberg, Erlangen, Germany
| | - Klaus-Armin Nave
- Department of Neurogenetics, Max Planck Institute for Multidisciplinary Sciences, Göttingen, Germany
| | - Robin J M Franklin
- Altos Labs, Cambridge Institute of Science, Granta Park, Cambridge CB21 6GP, UK
| | - Ranjan Dutta
- Department of Neurosciences, Lerner Research Institute, Cleveland Clinic, Case Western Reserve University School of Medicine, Cleveland, OH 44195, USA
| | - Bruce D Trapp
- Department of Neurosciences, Lerner Research Institute, Cleveland Clinic, Case Western Reserve University School of Medicine, Cleveland, OH 44195, USA
| | - Ming Hu
- Department of Quantitative Health Sciences, Lerner Research Institute, Cleveland Clinic Foundation, Case Western Reserve University School of Medicine, Cleveland, OH, USA
| | - Matthew A Smith
- Department of Pharmaceutical Sciences, Northeast Ohio Medical University, Rootstown, OH, USA; Rebecca D. Considine Research Institute, Akron Children's Hospital, Akron, OH, USA
| | - Michael P Jankowski
- Department of Anesthesia, Division of Pain Management, Cincinnati Children's Hospital Medical Center, Cincinnati, OH, USA; Pediatric Pain Research Center, Cincinnati Children's Hospital, Cincinnati, OH, USA
| | - Samantha K Barton
- Florey Institute of Neuroscience and Mental Health, University of Melbourne, Melbourne 3052, Australia
| | - Xuelian He
- Center for Translational Medicine, Key Laboratory of Birth Defects and Related Disease of Women and Children of MOE, State Key Laboratory of Biotherapy, West China Second University Hospital, Sichuan University, Chengdu, Sichuan, P.R. China.
| | - Q Richard Lu
- Department of Pediatrics, Division of Experimental Hematology and Cancer Biology, Cincinnati Children's Hospital Medical Center, Cincinnati, OH, USA.
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Yu K, Schmitt S, Ni Y, Crane EC, Smith MA, He B. Transcranial Focused Ultrasound Remotely Modulates Extrastriate Visual Cortex with Subregion Specificity. bioRxiv 2024:2024.01.20.576476. [PMID: 38328120 PMCID: PMC10849517 DOI: 10.1101/2024.01.20.576476] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/09/2024]
Abstract
Low-intensity transcranial focused ultrasound (tFUS) has emerged as a powerful neuromodulation tool characterized by its deep penetration and precise spatial targeting to influence neural activity. Our study directed low-intensity tFUS stimulation onto a region of prefrontal cortex (the frontal eye field, or FEF) of a rhesus macaque to examine its impact on a remote site, the extrastriate visual cortex (area V4). This pair of cortical regions form a top-down modulatory circuit that has been studied extensively with electrical microstimulation. To measure the impact of tFUS stimulation, we recorded local field potentials (LFPs) and multi-unit spiking activities from a multi-electrode array implanted in the visual cortex. To deliver tFUS stimulation, we leveraged a customized 128-element random array ultrasound transducer with improved spatial targeting. We observed that tFUS stimulation in FEF produced modulation of V4 neuronal activity, either through enhancement or suppression, dependent on the pulse repetition frequency of the tFUS stimulation. Electronically steering the transcranial ultrasound focus through the targeted FEF cortical region produced changes in the level of modulation, indicating that the tFUS stimulation was spatially targeted within FEF. Modulation of V4 activity was confined to specific frequency bands, and this modulation was dependent on the presence or absence of a visual stimulus during tFUS stimulation. A control study targeting the insula produced no effect, emphasizing the region-specific nature of tFUS neuromodulation. Our findings shed light on the capacity of tFUS to modulate specific neural pathways and provide a comprehensive understanding of its potential applications for neuromodulation within brain networks.
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Cowley BR, Stan PL, Pillow JW, Smith MA. Compact deep neural network models of visual cortex. bioRxiv 2023:2023.11.22.568315. [PMID: 38045255 PMCID: PMC10690296 DOI: 10.1101/2023.11.22.568315] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/05/2023]
Abstract
A powerful approach to understanding the computations carried out in visual cortex is to develop models that predict neural responses to arbitrary images. Deep neural network (DNN) models have worked remarkably well at predicting neural responses [1, 2, 3], yet their underlying computations remain buried in millions of parameters. Have we simply replaced one complicated system in vivo with another in silico ? Here, we train a data-driven deep ensemble model that predicts macaque V4 responses ∼50% more accurately than currently-used task-driven DNN models. We then compress this deep ensemble to identify compact models that have 5,000x fewer parameters yet equivalent accuracy as the deep ensemble. We verified that the stimulus preferences of the compact models matched those of the real V4 neurons by measuring V4 responses to both 'maximizing' and adversarial images generated using compact models. We then analyzed the inner workings of the compact models and discovered a common circuit motif: Compact models share a similar set of filters in early stages of processing but then specialize by heavily consolidating this shared representation with a precise readout. This suggests that a V4 neuron's stimulus preference is determined entirely by its consolidation step. To demonstrate this, we investigated the compression step of a dot-detecting compact model and found a set of simple computations that may be carried out by dot-selective V4 neurons. Overall, our work demonstrates that the DNN models currently used in computational neuroscience are needlessly large; our approach provides a new way forward for obtaining explainable, high-accuracy models of visual cortical neurons.
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Benin BM, Hillyer T, Crugnale AS, Fulk A, Thomas CA, Crowder MW, Smith MA, Shin WS. Taxifolin as a Metallo-β-Lactamase Inhibitor in Combination with Augmentin against Verona Imipenemase 2 Expressing Pseudomonas aeruginosa. Microorganisms 2023; 11:2653. [PMID: 38004664 PMCID: PMC10673258 DOI: 10.3390/microorganisms11112653] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [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: 09/15/2023] [Revised: 10/23/2023] [Accepted: 10/25/2023] [Indexed: 11/26/2023] Open
Abstract
Among the various mechanisms that bacteria use to develop antibiotic resistance, the multiple expression of β-lactamases is particularly problematic, threatening public health and increasing patient mortality rates. Even if a combination therapy-in which a β-lactamase inhibitor is administered together with a β-lactam antibiotic-has proven effective against serine-β-lactamases, there are no currently approved metallo-β-lactamase inhibitors. Herein, we demonstrate that quercetin and its analogs are promising starting points for the further development of safe and effective metallo-β-lactamase inhibitors. Through a combined computational and in vitro approach, taxifolin was found to inhibit VIM-2 expressing P. aeruginosa cell proliferation at <4 μg/mL as part of a triple combination with amoxicillin and clavulanate. Furthermore, we tested this combination in mice with abrasive skin infections. Together, these results demonstrate that flavonol compounds, such as taxifolin, may be developed into effective metallo-β-lactamase inhibitors.
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Affiliation(s)
- Bogdan M. Benin
- Department of Pharmaceutical Sciences, Northeast Ohio Medical University, Rootstown, OH 44272, USA; (B.M.B.); (T.H.); (A.F.); (M.A.S.)
| | - Trae Hillyer
- Department of Pharmaceutical Sciences, Northeast Ohio Medical University, Rootstown, OH 44272, USA; (B.M.B.); (T.H.); (A.F.); (M.A.S.)
| | - Aylin S. Crugnale
- Department of Pharmaceutical Sciences, Northeast Ohio Medical University, Rootstown, OH 44272, USA; (B.M.B.); (T.H.); (A.F.); (M.A.S.)
| | - Andrew Fulk
- Department of Pharmaceutical Sciences, Northeast Ohio Medical University, Rootstown, OH 44272, USA; (B.M.B.); (T.H.); (A.F.); (M.A.S.)
| | - Caitlyn A. Thomas
- Department of Chemistry and Biochemistry, Miami University, Oxford, OH 45056, USA; (C.A.T.); (M.W.C.)
| | - Michael W. Crowder
- Department of Chemistry and Biochemistry, Miami University, Oxford, OH 45056, USA; (C.A.T.); (M.W.C.)
| | - Matthew A. Smith
- Department of Pharmaceutical Sciences, Northeast Ohio Medical University, Rootstown, OH 44272, USA; (B.M.B.); (T.H.); (A.F.); (M.A.S.)
- Akron Children’s Hospital, Rebecca D. Considine Research Institute, Akron, OH 44302, USA
| | - Woo Shik Shin
- Department of Pharmaceutical Sciences, Northeast Ohio Medical University, Rootstown, OH 44272, USA; (B.M.B.); (T.H.); (A.F.); (M.A.S.)
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Stan PL, Smith MA. Expectation reshapes V4 neuronal activity and improves perceptual performance. bioRxiv 2023:2023.08.27.555026. [PMID: 37693510 PMCID: PMC10491105 DOI: 10.1101/2023.08.27.555026] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 09/12/2023]
Abstract
Recent visual experience creates expectations that heavily influence our visual perception. How does expectation shape the activity of cortical neurons to allow for improved perceptual discrimination of visual inputs? We recorded from populations of neurons in visual cortical area V4 while monkeys performed a natural image change detection task under different expectation conditions. We found that higher expectation led to an improvement in the ability to detect a change in an image. This improvement was associated with decreased neural responses to the image, providing evidence that a reduction in activity can improve stimulus encoding. The decrease in response could not be fully explained by short-timescale adaptation, suggesting partially separate mechanisms of adaptation and expectation. Additionally, higher expectation was associated with decreased trial-to-trial shared variability, indicating that a reduction in variability is a key means by which expectation influences perception. Taken together, the results of our study contribute to an understanding of how visual experience and expectation can shape our perception and behavior through modulating activity patterns across the visual cortex.
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Zhu Z, Waxman S, Wang B, Wallace J, Schmitt SE, Tyler-Kabara E, Ishikawa H, Schuman JS, Smith MA, Wollstein G, Sigal IA. In vivo Modulation of Intraocular and Intracranial Pressures Causes Nonlinear and Non-monotonic Deformations of the Lamina Cribrosa and Scleral Canal. bioRxiv 2023:2023.01.29.526113. [PMID: 36778255 PMCID: PMC9915473 DOI: 10.1101/2023.01.29.526113] [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] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
Purpose To evaluate changes in monkey optic nerve head (ONH) morphology under acutely controlled intraocular pressure (IOP) and intracranial pressure (ICP). Methods Seven ONHs from six monkeys were imaged via optical coherence tomography while IOP and ICP were maintained at one of 16 conditions. These conditions were defined by 4 levels for each pressure: low, baseline, high and very high. Images were processed to determine scleral canal area, aspect ratio, and planarity and anterior lamina cribrosa (ALC) shape index and curvature. Linear mixed effect models were utilized to investigate the effects of IOP, ICP and their interactions on ONH morphological features. The IOP-ICP interaction model was compared with one based on translaminar pressure difference (TLPD). Results We observed complex, eye-specific, non-linear patterns of ONH morphological changes with changes in IOP and ICP. For all ONH morphological features, linear mixed effects models demonstrated significant interactions between IOP and ICP that were unaccounted for by TLPD. Interactions indicate that the effects of IOP and ICP depend on the other pressure. The IOP-ICP interaction model was a higher quality predictor of ONH features than a TLPD model. Conclusions In vivo modulation of IOP and ICP causes nonlinear and non-monotonic changes in monkey ONH morphology that depend on both pressures and is not accounted for by a simplistic TLPD. These results support and extend prior findings. Translational Relevance A better understanding of ICP's influence on the effects of IOP can help inform the highly variable presentations of glaucoma and effective treatment strategies.
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Affiliation(s)
- Ziyi Zhu
- Department of Bioengineering, University of Pittsburgh, Pittsburgh, PA, USA
| | - Susannah Waxman
- Department of Ophthalmology, University of Pittsburgh, Pittsburgh, PA, USA
| | - Bo Wang
- Department of Bioengineering, University of Pittsburgh, Pittsburgh, PA, USA
- Department of Ophthalmology, University of Pittsburgh, Pittsburgh, PA, USA
- Wilmer Eye Institute, Johns Hopkins University School of Medicine, Baltimore, MD, USA
| | - Jacob Wallace
- Department of Ophthalmology, University of Pittsburgh, Pittsburgh, PA, USA
| | - Samantha E. Schmitt
- Department of Ophthalmology, University of Pittsburgh, Pittsburgh, PA, USA
- Department of Biomedical Engineering, Carnegie Mellon University, Pittsburgh, PA, USA
| | - Elizabeth Tyler-Kabara
- Department of Ophthalmology, University of Pittsburgh, Pittsburgh, PA, USA
- Department of Neurological Surgery, University of Pittsburgh, Pittsburgh, PA, USA
- Department of Neurosurgery, University of Texas-Austin, Austin, TX, USA
| | - Hiroshi Ishikawa
- Department of Ophthalmology, Casey Eye Institute, Oregon Health and Science University, Portland, OR, USA
- Department of Medical Informatics and Clinical Epidemiology (DMICE), Oregon Health & Science University, Portland, OR, USA
| | - Joel S. Schuman
- Department of Ophthalmology, NYU School of Medicine, New York, NY, USA
| | - Matthew A. Smith
- Department of Bioengineering, University of Pittsburgh, Pittsburgh, PA, USA
- Department of Ophthalmology, University of Pittsburgh, Pittsburgh, PA, USA
- Department of Biomedical Engineering, Carnegie Mellon University, Pittsburgh, PA, USA
- Neuroscience Institute, Carnegie Mellon University, Pittsburgh, PA, USA
| | - Gadi Wollstein
- Department of Ophthalmology, NYU School of Medicine, New York, NY, USA
| | - Ian A. Sigal
- Department of Bioengineering, University of Pittsburgh, Pittsburgh, PA, USA
- Department of Ophthalmology, University of Pittsburgh, Pittsburgh, PA, USA
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Yang J, Acharya D, Scammon WB, Schmitt S, Crane EC, Smith MA, Kainerstorfer JM. Cerebrovascular Impedance as a Function of Cerebral Perfusion Pressure. IEEE Open J Eng Med Biol 2023; 4:96-101. [PMID: 37234191 PMCID: PMC10208597 DOI: 10.1109/ojemb.2023.3236267] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/04/2022] [Revised: 12/19/2022] [Accepted: 12/21/2022] [Indexed: 09/30/2023] Open
Abstract
Goal: Cerebrovascular impedance is modulated by a vasoactive autoregulative mechanism in response to changes in cerebral perfusion pressure. Characterization of impedance and the limits of autoregulation are important biomarkers of cerebral health. We developed a method to quantify impedance based on the spectral content of cerebral blood flow and volume at the cardiac frequency, measured with diffuse optical methods. Methods: In three non-human primates, we modulated cerebral perfusion pressure beyond the limits of autoregulation. Cerebral blood flow and volume were measured with diffuse correlation spectroscopy and near-infrared spectroscopy, respectively. Results: We show that impedance can be used to identify the lower and upper limits of autoregulation. Conclusions: This impedance method may be an alternative method to measure autoregulation and a way of assessing cerebral health non-invasively at the clinical bedside.
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Affiliation(s)
- Jason Yang
- Department of Biomedical EngineeringCarnegie Mellon UniversityPittsburghPA15213USA
| | - Deepshikha Acharya
- Department of Biomedical EngineeringCarnegie Mellon UniversityPittsburghPA15213USA
| | - William B. Scammon
- Department of Biomedical EngineeringCarnegie Mellon UniversityPittsburghPA15213USA
| | - Samantha Schmitt
- Department of Biomedical EngineeringCarnegie Mellon UniversityPittsburghPA15213USA
- Neuroscience InstituteCarnegie Mellon UniversityPittsburghPA15213USA
| | - Emily C. Crane
- Department of Biomedical EngineeringCarnegie Mellon UniversityPittsburghPA15213USA
| | - Matthew A. Smith
- Department of Biomedical EngineeringCarnegie Mellon UniversityPittsburghPA15213USA
- Neuroscience InstituteCarnegie Mellon UniversityPittsburghPA15213USA
| | - Jana M. Kainerstorfer
- Department of Biomedical EngineeringCarnegie Mellon UniversityPittsburghPA15213USA
- Neuroscience InstituteCarnegie Mellon UniversityPittsburghPA15213USA
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Wei J, Hua Y, Yang B, Wang B, Schmitt SE, Wang B, Lucy KA, Ishikawa H, Schuman JS, Smith MA, Wollstein G, Sigal IA. Comparing Acute IOP-Induced Lamina Cribrosa Deformations Premortem and Postmortem. Transl Vis Sci Technol 2022; 11:1. [DOI: 10.1167/tvst.11.12.1] [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: 12/05/2022] Open
Affiliation(s)
- Junchao Wei
- Department of Ophthalmology, University of Pittsburgh, Pittsburgh, PA, USA
| | - Yi Hua
- Department of Ophthalmology, University of Pittsburgh, Pittsburgh, PA, USA
| | - Bin Yang
- Department of Ophthalmology, University of Pittsburgh, Pittsburgh, PA, USA
- Department of Engineering, Duquesne University, Pittsburgh, PA, USA
| | - Bo Wang
- Department of Ophthalmology, University of Pittsburgh, Pittsburgh, PA, USA
- Department of Bioengineering, University of Pittsburgh, Pittsburgh, PA, USA
- Wilmer Eye Institute, Johns Hopkins University School of Medicine, Baltimore, MD, USA
| | - Samantha E. Schmitt
- Department of Ophthalmology, University of Pittsburgh, Pittsburgh, PA, USA
- Department of Biomedical Engineering, Carnegie Mellon University, Pittsburgh, PA, USA
- Neuroscience Institute, Carnegie Mellon University, Pittsburgh, PA, USA
| | - Bingrui Wang
- Department of Ophthalmology, University of Pittsburgh, Pittsburgh, PA, USA
| | - Katie A. Lucy
- Department of Ophthalmology, NYU Langone Health, NYU Grossman School of Medicine, New York, NY, USA
| | - Hiroshi Ishikawa
- Department of Ophthalmology, NYU Langone Health, NYU Grossman School of Medicine, New York, NY, USA
- Department of Ophthalmology, Casey Eye Institute, Oregon Health & Science University, Portland, OR, USA
- Department of Medical Informatics and Clinical Epidemiology, Oregon Health & Science University, Portland, OR, USA
| | - Joel S. Schuman
- Department of Ophthalmology, NYU Langone Health, NYU Grossman School of Medicine, New York, NY, USA
- Department of Biomedical Engineering and Electrical and Computer Engineering, New York University Tandon School of Engineering, Brooklyn, NY, USA
- Neuroscience Institute, NYU Langone Health, New York, NY, USA
| | - Matthew A. Smith
- Department of Ophthalmology, University of Pittsburgh, Pittsburgh, PA, USA
- Department of Bioengineering, University of Pittsburgh, Pittsburgh, PA, USA
- Department of Biomedical Engineering, Carnegie Mellon University, Pittsburgh, PA, USA
- Neuroscience Institute, Carnegie Mellon University, Pittsburgh, PA, USA
| | - Gadi Wollstein
- Department of Ophthalmology, NYU Langone Health, NYU Grossman School of Medicine, New York, NY, USA
| | - Ian A. Sigal
- Department of Ophthalmology, University of Pittsburgh, Pittsburgh, PA, USA
- Department of Bioengineering, University of Pittsburgh, Pittsburgh, PA, USA
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Relander FAJ, Ruesch A, Yang J, Acharya D, Scammon B, Schmitt S, Crane EC, Smith MA, Kainerstorfer JM. Using near-infrared spectroscopy and a random forest regressor to estimate intracranial pressure. Neurophotonics 2022; 9:045001. [PMID: 36247716 PMCID: PMC9552940 DOI: 10.1117/1.nph.9.4.045001] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 06/16/2022] [Accepted: 09/23/2022] [Indexed: 06/16/2023]
Abstract
SIGNIFICANCE Intracranial pressure (ICP) measurements are important for patient treatment but are invasive and prone to complications. Noninvasive ICP monitoring methods exist, but they suffer from poor accuracy, lack of generalizability, or high cost. AIM We previously showed that cerebral blood flow (CBF) cardiac waveforms measured with diffuse correlation spectroscopy can be used for noninvasive ICP monitoring. Here we extend the approach to cardiac waveforms measured with near-infrared spectroscopy (NIRS). APPROACH Changes in hemoglobin concentrations were measured in eight nonhuman primates, in addition to invasive ICP, arterial blood pressure, and CBF changes. Features of average cardiac waveforms in hemoglobin and CBF signals were used to train a random forest (RF) regressor. RESULTS The RF regressor achieves a cross-validated ICP estimation of 0.937 r 2 , 2.703 - mm Hg 2 mean squared error (MSE), and 95% confidence interval (CI) of [ - 3.064 3.160 ] mmHg on oxyhemoglobin concentration changes; 0.946 r 2 , 2.301 - mmHg 2 MSE, and 95% CI of [ - 2.841 2.866 ] mmHg on total hemoglobin concentration changes; and 0.963 r 2 , 1.688 mmHg 2 MSE, and 95% CI of [ - 2.450 2.397 ] mmHg on CBF changes. CONCLUSIONS This study provides a proof of concept for the use of NIRS in noninvasive ICP estimation.
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Affiliation(s)
- Filip A. J. Relander
- Carnegie Mellon University, Department of Biomedical Engineering, Pittsburgh, Pennsylvania, United States
| | - Alexander Ruesch
- Carnegie Mellon University, Department of Biomedical Engineering, Pittsburgh, Pennsylvania, United States
| | - Jason Yang
- Carnegie Mellon University, Department of Biomedical Engineering, Pittsburgh, Pennsylvania, United States
| | - Deepshikha Acharya
- Carnegie Mellon University, Department of Biomedical Engineering, Pittsburgh, Pennsylvania, United States
| | - Bradley Scammon
- Carnegie Mellon University, Department of Biomedical Engineering, Pittsburgh, Pennsylvania, United States
| | - Samantha Schmitt
- Carnegie Mellon University, Department of Biomedical Engineering, Pittsburgh, Pennsylvania, United States
- Carnegie Mellon University, Neuroscience Institute, Pittsburgh, Pennsylvania, United States
| | - Emily C. Crane
- Carnegie Mellon University, Department of Biomedical Engineering, Pittsburgh, Pennsylvania, United States
| | - Matthew A. Smith
- Carnegie Mellon University, Department of Biomedical Engineering, Pittsburgh, Pennsylvania, United States
- Carnegie Mellon University, Neuroscience Institute, Pittsburgh, Pennsylvania, United States
| | - Jana M. Kainerstorfer
- Carnegie Mellon University, Department of Biomedical Engineering, Pittsburgh, Pennsylvania, United States
- Carnegie Mellon University, Neuroscience Institute, Pittsburgh, Pennsylvania, United States
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11
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Smith MA, Rosenstock CV. Do difficult airway alert cards help if practice doesn't change? Anaesthesia 2022; 77:1077-1080. [PMID: 35949181 DOI: 10.1111/anae.15832] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 07/20/2022] [Indexed: 11/30/2022]
Affiliation(s)
| | - C V Rosenstock
- Department of Anaesthesia, Nordsjaellands Hospital, Hillerød, Denmark
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12
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Johnston R, Snyder AC, Khanna SB, Issar D, Smith MA. The eyes reflect an internal cognitive state hidden in the population activity of cortical neurons. Cereb Cortex 2022; 32:3331-3346. [PMID: 34963140 PMCID: PMC9340396 DOI: 10.1093/cercor/bhab418] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/07/2020] [Revised: 10/19/2021] [Accepted: 10/20/2021] [Indexed: 01/01/2023] Open
Abstract
Decades of research have shown that global brain states such as arousal can be indexed by measuring the properties of the eyes. The spiking responses of neurons throughout the brain have been associated with the pupil, small fixational saccades, and vigor in eye movements, but it has been difficult to isolate how internal states affect the eyes, and vice versa. While recording from populations of neurons in the visual and prefrontal cortex (PFC), we recently identified a latent dimension of neural activity called "slow drift," which appears to reflect a shift in a global brain state. Here, we asked if slow drift is correlated with the action of the eyes in distinct behavioral tasks. We recorded from visual cortex (V4) while monkeys performed a change detection task, and PFC, while they performed a memory-guided saccade task. In both tasks, slow drift was associated with the size of the pupil and the microsaccade rate, two external indicators of the internal state of the animal. These results show that metrics related to the action of the eyes are associated with a dominant and task-independent mode of neural activity that can be accessed in the population activity of neurons across the cortex.
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Affiliation(s)
- Richard Johnston
- Department of Biomedical Engineering, Carnegie Mellon University, Pittsburgh, PA, 15213, USA
- Neuroscience Institute, Carnegie Mellon University, Pittsburgh, PA, 15213, USA
- Center for the Neural Basis of Cognition, Carnegie Mellon University, Pittsburgh, PA, 15213, USA
| | - Adam C Snyder
- Department of Brain and Cognitive Sciences, University of Rochester, Rochester, NY, 14627, USA
- Department of Neuroscience, University of Rochester, Rochester, NY, 14642, USA
- Center for Visual Science, University of Rochester, Rochester, NY, 14627, USA
| | - Sanjeev B Khanna
- Center for the Neural Basis of Cognition, Carnegie Mellon University, Pittsburgh, PA, 15213, USA
- Department of Bioengineering, University of Pittsburgh, Pittsburgh, PA, 15261, USA
| | - Deepa Issar
- Department of Biomedical Engineering, Carnegie Mellon University, Pittsburgh, PA, 15213, USA
- Center for the Neural Basis of Cognition, Carnegie Mellon University, Pittsburgh, PA, 15213, USA
| | - Matthew A Smith
- Department of Biomedical Engineering, Carnegie Mellon University, Pittsburgh, PA, 15213, USA
- Neuroscience Institute, Carnegie Mellon University, Pittsburgh, PA, 15213, USA
- Center for the Neural Basis of Cognition, Carnegie Mellon University, Pittsburgh, PA, 15213, USA
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13
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Acharya D, Mukherjea A, Cao J, Ruesch A, Schmitt S, Yang J, Smith MA, Kainerstorfer JM. Non-Invasive Spectroscopy for Measuring Cerebral Tissue Oxygenation and Metabolism as a Function of Cerebral Perfusion Pressure. Metabolites 2022; 12:metabo12070667. [PMID: 35888791 PMCID: PMC9323243 DOI: 10.3390/metabo12070667] [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] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/16/2022] [Revised: 07/14/2022] [Accepted: 07/15/2022] [Indexed: 11/16/2022] Open
Abstract
Near-infrared spectroscopy (NIRS) and diffuse correlation spectroscopy (DCS) measure cerebral hemodynamics, which in turn can be used to assess the cerebral metabolic rate of oxygen (CMRO2) and cerebral autoregulation (CA). However, current mathematical models for CMRO2 estimation make assumptions that break down for cerebral perfusion pressure (CPP)-induced changes in CA. Here, we performed preclinical experiments with controlled changes in CPP while simultaneously measuring NIRS and DCS at rest. We observed changes in arterial oxygen saturation (~10%) and arterial blood volume (~50%) with CPP, two variables often assumed to be constant in CMRO2 estimations. Hence, we propose a general mathematical model that accounts for these variations when estimating CMRO2 and validate its use for CA monitoring on our experimental data. We observed significant changes in the various oxygenation parameters, including the coupling ratio (CMRO2/blood flow) between regions of autoregulation and dysregulation. Our work provides an appropriate model and preliminary experimental evidence for the use of NIRS- and DCS-based tissue oxygenation and metabolism metrics for non-invasive diagnosis of CA health in CPP-altering neuropathologies.
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Affiliation(s)
- Deepshikha Acharya
- Department of Biomedical Engineering, Carnegie Mellon University, Pittsburgh, PA 15213, USA; (D.A.); (A.M.); (J.C.); (S.S.); (J.Y.); (M.A.S.)
| | - Ankita Mukherjea
- Department of Biomedical Engineering, Carnegie Mellon University, Pittsburgh, PA 15213, USA; (D.A.); (A.M.); (J.C.); (S.S.); (J.Y.); (M.A.S.)
| | - Jiaming Cao
- Department of Biomedical Engineering, Carnegie Mellon University, Pittsburgh, PA 15213, USA; (D.A.); (A.M.); (J.C.); (S.S.); (J.Y.); (M.A.S.)
| | - Alexander Ruesch
- Neuroscience Institute, Carnegie Mellon University, Pittsburgh, PA 15213, USA;
| | - Samantha Schmitt
- Department of Biomedical Engineering, Carnegie Mellon University, Pittsburgh, PA 15213, USA; (D.A.); (A.M.); (J.C.); (S.S.); (J.Y.); (M.A.S.)
- Neuroscience Institute, Carnegie Mellon University, Pittsburgh, PA 15213, USA;
| | - Jason Yang
- Department of Biomedical Engineering, Carnegie Mellon University, Pittsburgh, PA 15213, USA; (D.A.); (A.M.); (J.C.); (S.S.); (J.Y.); (M.A.S.)
| | - Matthew A. Smith
- Department of Biomedical Engineering, Carnegie Mellon University, Pittsburgh, PA 15213, USA; (D.A.); (A.M.); (J.C.); (S.S.); (J.Y.); (M.A.S.)
- Neuroscience Institute, Carnegie Mellon University, Pittsburgh, PA 15213, USA;
| | - Jana M. Kainerstorfer
- Department of Biomedical Engineering, Carnegie Mellon University, Pittsburgh, PA 15213, USA; (D.A.); (A.M.); (J.C.); (S.S.); (J.Y.); (M.A.S.)
- Neuroscience Institute, Carnegie Mellon University, Pittsburgh, PA 15213, USA;
- Correspondence:
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14
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Acharya D, Ruesch A, Schmitt S, Yang J, Smith MA, Kainerstorfer JM. Changes in neurovascular coupling with cerebral perfusion pressure indicate a link to cerebral autoregulation. J Cereb Blood Flow Metab 2022; 42:1247-1258. [PMID: 35078343 PMCID: PMC9207489 DOI: 10.1177/0271678x221076566] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
Abstract
Cerebral autoregulation ensures a stable average blood supply to brain tissue across steady state cerebral perfusion pressure (CPP) levels. Neurovascular coupling, in turn, relies on sufficient blood flow to meet neuronal demands during activation. These mechanisms break down in pathologies where extreme levels of CPP can cause dysregulation in cerebral blood flow. Here, we experimentally tested the influence of changes in CPP on neurovascular coupling in a hydrocephalus-type non-human primate model (n = 3). We recorded local neural and vascular evoked responses to a checkerboard visual stimulus, non-invasively, using electroencephalography and near-infrared spectroscopy respectively. The evoked signals showed changes in various waveform features in the visual evoked potentials and the hemodynamic responses, with CPP. We further used these signals to fit for a hemodynamic response function (HRF) to describe neurovascular coupling. We estimated n = 26 distinct HRFs at a subset of CPP values ranging from 40-120 mmHg across all subjects. The HRFs, when compared to a subject dependent healthy baseline (CPP 70-90 mmHg) HRF, showed significant changes in shape with increasing CPP (ρCPP = -0.55, p-valueCPP = 0.0049). Our study provides preliminary experimental evidence on the relationship between neurovascular coupling and CPP changes, especially when beyond the limits of static autoregulation.
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Affiliation(s)
- Deepshikha Acharya
- Department of Biomedical Engineering, Carnegie Mellon University, Pittsburgh, PA, USA
| | - Alexander Ruesch
- Neuroscience Institute, Carnegie Mellon University, Pittsburgh, PA, USA
| | - Samantha Schmitt
- Department of Biomedical Engineering, Carnegie Mellon University, Pittsburgh, PA, USA.,Neuroscience Institute, Carnegie Mellon University, Pittsburgh, PA, USA
| | - Jason Yang
- Department of Biomedical Engineering, Carnegie Mellon University, Pittsburgh, PA, USA
| | - Matthew A Smith
- Department of Biomedical Engineering, Carnegie Mellon University, Pittsburgh, PA, USA.,Neuroscience Institute, Carnegie Mellon University, Pittsburgh, PA, USA
| | - Jana M Kainerstorfer
- Department of Biomedical Engineering, Carnegie Mellon University, Pittsburgh, PA, USA.,Neuroscience Institute, Carnegie Mellon University, Pittsburgh, PA, USA
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15
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Frame G, Schuller A, Smith MA, Crish SD, Dengler-Crish CM. Alterations in Retinal Signaling Across Age and Sex in 3xTg Alzheimer’s Disease Mice. J Alzheimers Dis 2022; 88:471-492. [PMID: 35599482 PMCID: PMC9398084 DOI: 10.3233/jad-220016] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [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] [Indexed: 12/03/2022]
Abstract
Background: Visual disturbances often precede cognitive dysfunction in patients with Alzheimer’s disease (AD) and may coincide with early accumulation of amyloid-β (Aβ) protein in the retina. These findings have inspired critical research on in vivo ophthalmic Aβ imaging for disease biomarker detection but have not fully answered mechanistic questions on how retinal pathology affects visual signaling between the eye and brain. Objective: The goal of this study was to provide a functional and structural assessment of eye-brain communication between retinal ganglion cells (RGCs) and their primary projection target, the superior colliculus, in female and male 3xTg-AD mice across disease stages. Methods: Retinal electrophysiology, axonal transport, and immunofluorescence were used to determine RGC projection integrity, and retinal and collicular Aβ levels were assessed with advanced protein quantitation techniques. Results: 3xTg mice exhibited nuanced deficits in RGC electrical signaling, axonal transport, and synaptic integrity that exceeded normal age-related decrements in RGC function in age- and sex-matched healthy control mice. These deficits presented in sex-specific patterns among 3xTg mice, differing in the timing and severity of changes. Conclusion: These data support the premise that retinal Aβ is not just a benign biomarker in the eye, but may contribute to subtle, nuanced visual processing deficits. Such disruptions might enhance the biomarker potential of ocular amyloid and differentiate patients with incipient AD from patients experiencing normal age-related decrements in visual function.
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Affiliation(s)
- Gabrielle Frame
- Department of Pharmaceutical Sciences, Northeast Ohio Medical University, Rootstown, OH, USA
- Biomedical Sciences Graduate Program, Kent State University, Kent, OH, USA
| | - Adam Schuller
- Department of Pharmaceutical Sciences, Northeast Ohio Medical University, Rootstown, OH, USA
| | - Matthew A. Smith
- Department of Pharmaceutical Sciences, Northeast Ohio Medical University, Rootstown, OH, USA
- Rebecca D. Considine Research Institute, Akron Children’s Hospital, Akron, OH, USA
| | - Samuel D. Crish
- Department of Pharmaceutical Sciences, Northeast Ohio Medical University, Rootstown, OH, USA
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16
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Majumder A, Hosseinian S, Stroud M, Adhikari E, Saller JJ, Smith MA, Zhang G, Agarwal S, Creixell M, Meyer BS, Kinose F, Bowers K, Fang B, Stewart PA, Welsh EA, Boyle TA, Meyer AS, Koomen JM, Haura EB. Integrated Proteomics-Based Physical and Functional Mapping of AXL Kinase Signaling Pathways and Inhibitors Define Its Role in Cell Migration. Mol Cancer Res 2022; 20:542-555. [PMID: 35022314 PMCID: PMC8983558 DOI: 10.1158/1541-7786.mcr-21-0275] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/15/2021] [Revised: 09/14/2021] [Accepted: 01/07/2022] [Indexed: 11/16/2022]
Abstract
To better understand the signaling complexity of AXL, a member of the tumor-associated macrophage (TAM) receptor tyrosine kinase family, we created a physical and functional map of AXL signaling interactions, phosphorylation events, and target-engagement of three AXL tyrosine kinase inhibitors (TKI). We assessed AXL protein complexes using proximity-dependent biotinylation (BioID), effects of AXL TKI on global phosphoproteins using mass spectrometry, and target engagement of AXL TKI using activity-based protein profiling. BioID identifies AXL-interacting proteins that are mostly involved in cell adhesion/migration. Global phosphoproteomics show that AXL inhibition decreases phosphorylation of peptides involved in phosphatidylinositol-mediated signaling and cell adhesion/migration. Comparison of three AXL inhibitors reveals that TKI RXDX-106 inhibits pAXL, pAKT, and migration/invasion of these cells without reducing their viability, while bemcentinib exerts AXL-independent phenotypic effects on viability. Proteomic characterization of these TKIs demonstrates that they inhibit diverse targets in addition to AXL, with bemcentinib having the most off-targets. AXL and EGFR TKI cotreatment did not reverse resistance in cell line models of erlotinib resistance. However, a unique vulnerability was identified in one resistant clone, wherein combination of bemcentinib and erlotinib inhibited cell viability and signaling. We also show that AXL is overexpressed in approximately 30% to 40% of nonsmall but rarely in small cell lung cancer. Cell lines have a wide range of AXL expression, with basal activation detected rarely. IMPLICATIONS Our study defines mechanisms of action of AXL in lung cancers which can be used to establish assays to measure drug targetable active AXL complexes in patient tissues and inform the strategy for targeting it's signaling as an anticancer therapy.
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Affiliation(s)
- Anurima Majumder
- Department of Thoracic Oncology, H. Lee Moffitt Cancer Center and Research Institute, Tampa, FL 33612
| | - Sina Hosseinian
- Department of Thoracic Oncology, H. Lee Moffitt Cancer Center and Research Institute, Tampa, FL 33612
| | - Mia Stroud
- Department of Thoracic Oncology, H. Lee Moffitt Cancer Center and Research Institute, Tampa, FL 33612
| | - Emma Adhikari
- Department of Thoracic Oncology, H. Lee Moffitt Cancer Center and Research Institute, Tampa, FL 33612
| | - James J. Saller
- Department of Pathology, H. Lee Moffitt Cancer Center and Research Institute, Tampa, FL 33612
| | - Matthew A. Smith
- Department of Thoracic Oncology, H. Lee Moffitt Cancer Center and Research Institute, Tampa, FL 33612
| | - Guolin Zhang
- Department of Thoracic Oncology, H. Lee Moffitt Cancer Center and Research Institute, Tampa, FL 33612
| | - Shruti Agarwal
- Department of Thoracic Oncology, H. Lee Moffitt Cancer Center and Research Institute, Tampa, FL 33612
| | | | - Benjamin S. Meyer
- Department of Thoracic Oncology, H. Lee Moffitt Cancer Center and Research Institute, Tampa, FL 33612
| | - Fumi Kinose
- Department of Thoracic Oncology, H. Lee Moffitt Cancer Center and Research Institute, Tampa, FL 33612
| | - Kiah Bowers
- Department of Proteomics and Metabolomics Core, H. Lee Moffitt Cancer Center and Research Institute, Tampa, FL 33612
| | - Bin Fang
- Department of Proteomics and Metabolomics Core, H. Lee Moffitt Cancer Center and Research Institute, Tampa, FL 33612
| | - Paul A. Stewart
- Department of Biostatistics and Bioinformatics Shared Resource, H. Lee Moffitt Cancer Center and Research Institute, Tampa, FL 33612
| | - Eric A. Welsh
- Department of Biostatistics and Bioinformatics Shared Resource, H. Lee Moffitt Cancer Center and Research Institute, Tampa, FL 33612
| | - Theresa A. Boyle
- Department of Pathology, H. Lee Moffitt Cancer Center and Research Institute, Tampa, FL 33612
| | | | - John M. Koomen
- Department of Molecular Oncology, H. Lee Moffitt Cancer Center and Research Institute, Tampa, FL 33612
| | - Eric B. Haura
- Department of Thoracic Oncology, H. Lee Moffitt Cancer Center and Research Institute, Tampa, FL 33612
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17
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Ruesch A, Yang J, Schmitt S, Acharya D, Smith MA, Kainerstorfer JM. Erratum: Estimating intracranial pressure using pulsatile cerebral blood flow measured with diffuse correlation spectroscopy: erratum. Biomed Opt Express 2022; 13:710-712. [PMID: 35284189 PMCID: PMC8884211 DOI: 10.1364/boe.452731] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/07/2022] [Indexed: 06/14/2023]
Abstract
[This corrects the article on p. 1462 in vol. 11, PMID: 32206422.].
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Affiliation(s)
- Alexander Ruesch
- Department of Biomedical Engineering,
Carnegie Mellon University, 5000 Forbes
Avenue, Pittsburgh, PA 15213, USA
| | - Jason Yang
- Department of Biomedical Engineering,
Carnegie Mellon University, 5000 Forbes
Avenue, Pittsburgh, PA 15213, USA
| | - Samantha Schmitt
- Department of Biomedical Engineering,
Carnegie Mellon University, 5000 Forbes
Avenue, Pittsburgh, PA 15213, USA
- Neuroscience Institute,
Carnegie Mellon University, 4400 Fifth
Avenue, Pittsburgh, PA 15213, USA
- Department of Ophthalmology,
University of Pittsburgh, 203 Lothrop
Street, Pittsburgh, PA 15213, USA
| | - Deepshikha Acharya
- Department of Biomedical Engineering,
Carnegie Mellon University, 5000 Forbes
Avenue, Pittsburgh, PA 15213, USA
| | - Matthew A. Smith
- Department of Biomedical Engineering,
Carnegie Mellon University, 5000 Forbes
Avenue, Pittsburgh, PA 15213, USA
- Neuroscience Institute,
Carnegie Mellon University, 4400 Fifth
Avenue, Pittsburgh, PA 15213, USA
- Department of Ophthalmology,
University of Pittsburgh, 203 Lothrop
Street, Pittsburgh, PA 15213, USA
| | - Jana M. Kainerstorfer
- Department of Biomedical Engineering,
Carnegie Mellon University, 5000 Forbes
Avenue, Pittsburgh, PA 15213, USA
- Neuroscience Institute,
Carnegie Mellon University, 4400 Fifth
Avenue, Pittsburgh, PA 15213, USA
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18
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Zhu Z, Waxman S, Wang B, Wallace J, Schmitt SE, Tyler-Kabara E, Ishikawa H, Schuman JS, Smith MA, Wollstein G, Sigal IA. Interplay between intraocular and intracranial pressure effects on the optic nerve head in vivo. Exp Eye Res 2021; 213:108809. [PMID: 34736887 DOI: 10.1016/j.exer.2021.108809] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/14/2020] [Revised: 10/19/2021] [Accepted: 10/25/2021] [Indexed: 12/19/2022]
Abstract
Intracranial pressure (ICP) has been proposed to play an important role in the sensitivity to intraocular pressure (IOP) and susceptibility to glaucoma. However, the in vivo effects of simultaneous, controlled, acute variations in ICP and IOP have not been directly measured. We quantified the deformations of the anterior lamina cribrosa (ALC) and scleral canal at Bruch's membrane opening (BMO) under acute elevation of IOP and/or ICP. Four eyes of three adult monkeys were imaged in vivo with OCT under four pressure conditions: IOP and ICP either at baseline or elevated. The BMO and ALC were reconstructed from manual delineations. From these, we determined canal area at the BMO (BMO area), BMO aspect ratio and planarity, and ALC median depth relative to the BMO plane. To better account for the pressure effects on the imaging, we also measured ALC visibility as a percent of the BMO area. Further, ALC depths were analyzed only in regions where the ALC was visible in all pressure conditions. Bootstrap sampling was used to obtain mean estimates and confidence intervals, which were then used to test for significant effects of IOP and ICP, independently and in interaction. Response to pressure manipulation was highly individualized between eyes, with significant changes detected in a majority of the parameters. Significant interactions between ICP and IOP occurred in all measures, except ALC visibility. On average, ICP elevation expanded BMO area by 0.17 mm2 at baseline IOP, and contracted BMO area by 0.02 mm2 at high IOP. ICP elevation decreased ALC depth by 10 μm at baseline IOP, but increased depth by 7 μm at high IOP. ALC visibility decreased as ICP increased, both at baseline (-10%) and high IOP (-17%). IOP elevation expanded BMO area by 0.04 mm2 at baseline ICP, and contracted BMO area by 0.09 mm2 at high ICP. On average, IOP elevation caused the ALC to displace 3.3 μm anteriorly at baseline ICP, and 22 μm posteriorly at high ICP. ALC visibility improved as IOP increased, both at baseline (5%) and high ICP (8%). In summary, changing IOP or ICP significantly deformed both the scleral canal and the lamina of the monkey ONH, regardless of the other pressure level. There were significant interactions between the effects of IOP and those of ICP on LC depth, BMO area, aspect ratio and planarity. On most eyes, elevating both pressures by the same amount did not cancel out the effects. Altogether our results show that ICP affects sensitivity to IOP, and thus that it can potentially also affect susceptibility to glaucoma.
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Affiliation(s)
- Ziyi Zhu
- Department of Bioengineering, University of Pittsburgh, Pittsburgh, PA, USA
| | - Susannah Waxman
- Department of Ophthalmology, University of Pittsburgh, Pittsburgh, PA, USA
| | - Bo Wang
- Department of Bioengineering, University of Pittsburgh, Pittsburgh, PA, USA; Department of Ophthalmology, University of Pittsburgh, Pittsburgh, PA, USA; Wilmer Eye Institute, Johns Hopkins University School of Medicine, Baltimore, MD, USA
| | - Jacob Wallace
- Department of Ophthalmology, University of Pittsburgh, Pittsburgh, PA, USA
| | - Samantha E Schmitt
- Department of Ophthalmology, University of Pittsburgh, Pittsburgh, PA, USA; Department of Biomedical Engineering, Carnegie Mellon University, Pittsburgh, PA, USA
| | - Elizabeth Tyler-Kabara
- Department of Bioengineering, University of Pittsburgh, Pittsburgh, PA, USA; Department of Neurological Surgery, University of Pittsburgh, Pittsburgh, PA, USA; Department of Neurosurgery, University of Texas-Austin, Austin, TX, USA
| | - Hiroshi Ishikawa
- Department of Ophthalmology, NYU School of Medicine, New York, NY, USA
| | - Joel S Schuman
- Department of Ophthalmology, NYU School of Medicine, New York, NY, USA
| | - Matthew A Smith
- Department of Bioengineering, University of Pittsburgh, Pittsburgh, PA, USA; Department of Ophthalmology, University of Pittsburgh, Pittsburgh, PA, USA; Department of Biomedical Engineering, Carnegie Mellon University, Pittsburgh, PA, USA
| | - Gadi Wollstein
- Department of Ophthalmology, NYU School of Medicine, New York, NY, USA
| | - Ian A Sigal
- Department of Bioengineering, University of Pittsburgh, Pittsburgh, PA, USA; Department of Ophthalmology, University of Pittsburgh, Pittsburgh, PA, USA.
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19
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Umakantha A, Morina R, Cowley BR, Snyder AC, Smith MA, Yu BM. Bridging neuronal correlations and dimensionality reduction. Neuron 2021; 109:2740-2754.e12. [PMID: 34293295 PMCID: PMC8505167 DOI: 10.1016/j.neuron.2021.06.028] [Citation(s) in RCA: 15] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/12/2020] [Revised: 05/05/2021] [Accepted: 06/25/2021] [Indexed: 01/01/2023]
Abstract
Two commonly used approaches to study interactions among neurons are spike count correlation, which describes pairs of neurons, and dimensionality reduction, applied to a population of neurons. Although both approaches have been used to study trial-to-trial neuronal variability correlated among neurons, they are often used in isolation and have not been directly related. We first established concrete mathematical and empirical relationships between pairwise correlation and metrics of population-wide covariability based on dimensionality reduction. Applying these insights to macaque V4 population recordings, we found that the previously reported decrease in mean pairwise correlation associated with attention stemmed from three distinct changes in population-wide covariability. Overall, our work builds the intuition and formalism to bridge between pairwise correlation and population-wide covariability and presents a cautionary tale about the inferences one can make about population activity by using a single statistic, whether it be mean pairwise correlation or dimensionality.
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Affiliation(s)
- Akash Umakantha
- Carnegie Mellon Neuroscience Institute, Pittsburgh, PA 15213, USA; Machine Learning Department, Carnegie Mellon University, Pittsburgh, PA 15213, USA
| | - Rudina Morina
- Department of Electrical and Computer Engineering, Carnegie Mellon University, Pittsburgh, PA 15213, USA
| | - Benjamin R Cowley
- Machine Learning Department, Carnegie Mellon University, Pittsburgh, PA 15213, USA; Princeton Neuroscience Institute, Princeton University, Princeton, NJ 08544, USA
| | - Adam C Snyder
- Department of Electrical and Computer Engineering, Carnegie Mellon University, Pittsburgh, PA 15213, USA; Department of Brain and Cognitive Sciences, University of Rochester, Rochester, NY 14642, USA; Department of Neuroscience, University of Rochester, Rochester, NY 14642, USA; Center for Visual Science, University of Rochester, Rochester, NY 14642, USA
| | - Matthew A Smith
- Carnegie Mellon Neuroscience Institute, Pittsburgh, PA 15213, USA; Department of Biomedical Engineering, Carnegie Mellon University, Pittsburgh, PA 15213, USA.
| | - Byron M Yu
- Carnegie Mellon Neuroscience Institute, Pittsburgh, PA 15213, USA; Department of Electrical and Computer Engineering, Carnegie Mellon University, Pittsburgh, PA 15213, USA; Department of Biomedical Engineering, Carnegie Mellon University, Pittsburgh, PA 15213, USA.
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20
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Davies-Oliveira JC, Smith MA, Grover S, Canfell K, Crosbie EJ. Eliminating Cervical Cancer: Progress and Challenges for High-income Countries. Clin Oncol (R Coll Radiol) 2021; 33:550-559. [PMID: 34315640 DOI: 10.1016/j.clon.2021.06.013] [Citation(s) in RCA: 25] [Impact Index Per Article: 8.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/10/2021] [Revised: 06/21/2021] [Accepted: 06/29/2021] [Indexed: 11/26/2022]
Abstract
In 2020, the World Health Organization launched a major initiative to eliminate cervical cancer globally. The initiative is built around the three key pillars of human papillomavirus (HPV) vaccination, cervical screening and treatment, with associated intervention targets for the year 2030. The '90-70-90' targets specify that 90% of adolescent girls receive prophylactic HPV vaccination, 70% of adult women receive a minimum twice-in-a-lifetime cervical HPV test and 90% receive appropriate treatment for preinvasive or invasive disease. Modelling has shown that if these targets are met, the elimination of cervical cancer, defined as fewer than four cases per 100 000 women per annum, will be achieved within a century. Many high-income countries are well positioned to eliminate cervical cancer within the coming decades, but few have achieved '90-70-90' and many challenges must still be addressed to deliver these critical interventions effectively. This review considers the current status of cervical cancer control in relation to each of the three elimination pillars in high-income countries and discusses some of the developments that will assist countries in reaching these ambitious targets by 2030.
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Affiliation(s)
- J C Davies-Oliveira
- Gynaecological Oncology Research Group, Division of Cancer Sciences, University of Manchester, Faculty of Biology, Medicine and Health, Manchester, UK; Department of Obstetrics and Gynaecology, St Mary's Hospital, Manchester University NHS Foundation Trust, Manchester Academic Health Science Centre, Manchester, UK
| | - M A Smith
- The Daffodil Centre, The University of Sydney, a joint venture with Cancer Council NSW, Sydney, New South Wales, Australia
| | - S Grover
- The Daffodil Centre, The University of Sydney, a joint venture with Cancer Council NSW, Sydney, New South Wales, Australia; Department of Radiation Oncology, University of Pennsylvania, Philadelphia, Pennsylvania, USA
| | - K Canfell
- The Daffodil Centre, The University of Sydney, a joint venture with Cancer Council NSW, Sydney, New South Wales, Australia.
| | - E J Crosbie
- Gynaecological Oncology Research Group, Division of Cancer Sciences, University of Manchester, Faculty of Biology, Medicine and Health, Manchester, UK; Department of Obstetrics and Gynaecology, St Mary's Hospital, Manchester University NHS Foundation Trust, Manchester Academic Health Science Centre, Manchester, UK
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21
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Smith MA, Waugh DA, McBurney DL, George JC, Suydam RS, Thewissen JGM, Crish SD. Cover Image, Volume 529, Issue 9. J Comp Neurol 2021. [DOI: 10.1002/cne.25160] [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: 11/07/2022]
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22
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Li J, West JB, Hart A, Wegrzyn JL, Smith MA, Domec JC, Loopstra CA, Casola C. Extensive Variation in Drought-Induced Gene Expression Changes Between Loblolly Pine Genotypes. Front Genet 2021; 12:661440. [PMID: 34140968 PMCID: PMC8203665 DOI: 10.3389/fgene.2021.661440] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/30/2021] [Accepted: 04/07/2021] [Indexed: 01/22/2023] Open
Abstract
Drought response is coordinated through expression changes in a large suite of genes. Interspecific variation in this response is common and associated with drought-tolerant and -sensitive genotypes. The extent to which different genetic networks orchestrate the adjustments to water deficit in tolerant and sensitive genotypes has not been fully elucidated, particularly in non-model or woody plants. Differential expression analysis via RNA-seq was evaluated in root tissue exposed to simulated drought conditions in two loblolly pine (Pinus taeda L.) clones with contrasting tolerance to drought. Loblolly pine is the prevalent conifer in southeastern U.S. and a major commercial forestry species worldwide. Significant changes in gene expression levels were found in more than 4,000 transcripts [drought-related transcripts (DRTs)]. Genotype by environment (GxE) interactions were prevalent, suggesting that different cohorts of genes are influenced by drought conditions in the tolerant vs. sensitive genotypes. Functional annotation categories and metabolic pathways associated with DRTs showed higher levels of overlap between clones, with the notable exception of GO categories in upregulated DRTs. Conversely, both differentially expressed transcription factors (TFs) and TF families were largely different between clones. Our results indicate that the response of a drought-tolerant loblolly pine genotype vs. a sensitive genotype to water limitation is remarkably different on a gene-by-gene level, although it involves similar genetic networks. Upregulated transcripts under drought conditions represent the most diverging component between genotypes, which might depend on the activation and repression of substantially different groups of TFs.
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Affiliation(s)
- Jingjia Li
- Department of Ecology and Conservation Biology, Texas A&M University, College Station, TX, United States
| | - Jason B West
- Department of Ecology and Conservation Biology, Texas A&M University, College Station, TX, United States
| | - Alexander Hart
- Department of Ecology and Evolutionary Biology, University of Connecticut, Storrs, CT, United States
| | - Jill L Wegrzyn
- Department of Ecology and Evolutionary Biology, University of Connecticut, Storrs, CT, United States
| | - Matthew A Smith
- Department of Biological Sciences, Florida International University, Miami, FL, United States
| | - Jean-Christophe Domec
- Bordeaux Sciences Agro, UMR 1391 INRA ISPA, Gradignan, France.,Nicholas School of the Environment, Duke University, Durham, NC, United States
| | - Carol A Loopstra
- Department of Ecology and Conservation Biology, Texas A&M University, College Station, TX, United States
| | - Claudio Casola
- Department of Ecology and Conservation Biology, Texas A&M University, College Station, TX, United States
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23
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Cappelli HC, Guarino BD, Kanugula AK, Adapala RK, Perera V, Smith MA, Paruchuri S, Thodeti CK. Transient receptor potential vanilloid 4 channel deletion regulates pathological but not developmental retinal angiogenesis. J Cell Physiol 2021; 236:3770-3779. [PMID: 33078410 PMCID: PMC7920906 DOI: 10.1002/jcp.30116] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/02/2019] [Revised: 10/07/2020] [Accepted: 10/09/2020] [Indexed: 01/08/2023]
Abstract
Transient receptor potential vanilloid 4 (TRPV4) channels are mechanosensitive ion channels that regulate systemic endothelial cell (EC) functions such as vasodilation, permeability, and angiogenesis. TRPV4 is expressed in retinal ganglion cells, Müller glia, pigment epithelium, microvascular ECs, and modulates cell volume regulation, calcium homeostasis, and survival. TRPV4-mediated physiological or pathological retinal angiogenesis remains poorly understood. Here, we demonstrate that TRPV4 is expressed, functional, and mechanosensitive in retinal ECs. The genetic deletion of TRPV4 did not affect postnatal developmental angiogenesis but increased pathological neovascularization in response to oxygen-induced retinopathy (OIR). Retinal vessels from TRPV4 knockout mice subjected to OIR exhibited neovascular tufts that projected into the vitreous humor and displayed reduced pericyte coverage compared with wild-type mice. These results suggest that TRPV4 is a regulator of retinal angiogenesis, its deletion augments pathological retinal angiogenesis, and that TRPV4 could be a novel target for the development of therapies against neovascular ocular diseases.
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Affiliation(s)
- Holly C. Cappelli
- Department of Integrative Medical Sciences, Northeast Ohio Medical University, Rootstown, OH 44272
- School of Biomedical Sciences, Kent State University, Kent, OH 44240
| | - Brianna D. Guarino
- Department of Integrative Medical Sciences, Northeast Ohio Medical University, Rootstown, OH 44272
| | - Anantha K. Kanugula
- Department of Integrative Medical Sciences, Northeast Ohio Medical University, Rootstown, OH 44272
| | - Ravi K. Adapala
- Department of Integrative Medical Sciences, Northeast Ohio Medical University, Rootstown, OH 44272
- School of Biomedical Sciences, Kent State University, Kent, OH 44240
| | - Vidushani Perera
- Department of Integrative Medical Sciences, Northeast Ohio Medical University, Rootstown, OH 44272
| | - Matthew A. Smith
- Department of Pharmaceutical Sciences, Northeast Ohio Medical University, Rootstown, OH 44272
- Rebbeca D. Considine Research Institute, Akron Children’s Hospital, Akron, OH 44302
| | | | - Charles K. Thodeti
- Department of Integrative Medical Sciences, Northeast Ohio Medical University, Rootstown, OH 44272
- School of Biomedical Sciences, Kent State University, Kent, OH 44240
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24
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Bretland KA, Lin L, Bretland KM, Smith MA, Fleming SM, Dengler-Crish CM. Irisin treatment lowers levels of phosphorylated tau in the hippocampus of pre-symptomatic female but not male htau mice. Neuropathol Appl Neurobiol 2021; 47:967-978. [PMID: 33768561 PMCID: PMC9292848 DOI: 10.1111/nan.12711] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/23/2020] [Revised: 03/15/2021] [Accepted: 03/18/2021] [Indexed: 12/12/2022]
Abstract
AIMS Irisin is a hormone cleaved from fibronectin type-III domain-containing protein 5 in response to exercise and may be therapeutic in Alzheimer's disease (AD). Irisin is shown to repair damage caused by midlife cardiometabolic risk factors for AD (i.e., diabetes mellitus; hypertension), prevent neural amyloid beta aggregation and reduce neuroinflammation. However, there are no investigations of irisin's effect on AD-associated tauopathy in the brain. This study begins to address this gap in knowledge. METHODS Transgenic htau mice that selectively develop age-related tauopathy were treated with recombinant irisin (100 µg/kg weekly i.p.) beginning at a pre-symptomatic age (4 months) to determine if irisin could prevent emergence of early neuropathology. One month later, mice were sacrificed to collect brain tissue and serum. Protein levels of ptau (serine 202), inflammatory cytokine tumour necrosis factor alpha (TNFα) and FNDC5 were quantified using capillary-based western blotting (Wes). RESULTS Our data show that irisin treatment significantly reduced ptau and TNFα in the hippocampus and serum of female htau mice compared to vehicle-treated controls. Irisin treatment did not alter ptau levels in male htau hippocampus and appeared to enhance both neural and systemic TNFα levels. CONCLUSIONS This study provides the first evidence that enhancing the endogenous hormone irisin may be therapeutic against emerging neuropathology in a tauopathy-selective AD model. This is important because there are currently no disease-modifying therapeutics available for AD, and few agents in development address the multiple disease targets irisin appears to-making irisin an intriguing therapeutic candidate for further investigation.
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Affiliation(s)
- Katie A Bretland
- Department of Pharmaceutical Sciences, Northeast Ohio Medical University, Rootstown, OH, USA
| | - Li Lin
- Department of Pharmaceutical Sciences, Northeast Ohio Medical University, Rootstown, OH, USA
| | - Kimberly M Bretland
- Department of Pharmaceutical Sciences, Northeast Ohio Medical University, Rootstown, OH, USA.,Kent State University, Kent, OH, USA
| | - Matthew A Smith
- Department of Pharmaceutical Sciences, Northeast Ohio Medical University, Rootstown, OH, USA.,Akron Children's Hospital, Rebecca D. Considine Research Institute, Akron, OH, USA
| | - Sheila M Fleming
- Department of Pharmaceutical Sciences, Northeast Ohio Medical University, Rootstown, OH, USA
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25
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Amirmokhtari N, Foresi BD, Dewan SS, Bouhenni RA, Smith MA. Absence of Cytochrome P450-1b1 Increases Susceptibility of Pressure-Induced Axonopathy in the Murine Retinal Projection. Front Cell Dev Biol 2021; 9:636321. [PMID: 33748124 PMCID: PMC7973214 DOI: 10.3389/fcell.2021.636321] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/01/2020] [Accepted: 01/25/2021] [Indexed: 01/14/2023] Open
Abstract
Mutations in the cytochrome P450-1B1 (Cyp1b1) gene is a common genetic predisposition associated with various human glaucomas, most prominently in primary congenital glaucoma (PCG). The role of Cyp1b1 in the eye is largely unknown, however, its absence appears to drive the maldevelopment of anterior eye structures responsible for aqueous fluid drainage in murine models. Nevertheless, vision loss in glaucoma ultimately results from the structural and functional loss of retinal ganglion cells (RGCs). Cyp1b1’s influence in the development and support of retinal ganglion cell structure and function under normal conditions or during stress, such as elevated ocular pressure; the most common risk factor in glaucoma, remains grossly unknown. Thus, to determine the role of Cyp1b1 in normal retinal projection development we first assessed the strucutrual integrity of RGCs in the retina, optic nerve, and superior colliculus in un-manipulated (naïve) Cyp1b1-knockout (Cyp1b1–/–) mice. In addition, in a separate cohort of Cyp1b1–/– and wildtype mice, we elevated and maintained intraocular pressure (IOP) at glaucomatous levels for 5-weeks, after which we compared RGC density, node of Ranvier morphology, and axonal transport between the genotypes. Our results demonstrate that naïve Cyp1b1–/– mice develop an anatomically intact retinal projection absent of overt glaucomatous pathology. Following pressure elevation, Cyp1b1–/– accelerated degradation of axonal transport from the retina to the superior colliculus and altered morphology of the nodes of Ranvier and adjacent paranodes in the optic nerves. Together this data suggests the absence Cyp1b1 expression alone is insufficient to drive murine glaucomatous pathology, however, may increase the vulnerability of retinal axons to disease relevant elevations in IOP.
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Affiliation(s)
- Naseem Amirmokhtari
- Department of Pharmaceutical Sciences, Northeast Ohio Medical University, Rootstown, OH, United States.,Integrated Pharmaceutical Medicine Graduate Program, Northeast Ohio Medical University, Rootstown, OH, United States
| | - Brian D Foresi
- Department of Pharmaceutical Sciences, Northeast Ohio Medical University, Rootstown, OH, United States
| | - Shiv S Dewan
- Department of Pharmaceutical Sciences, Northeast Ohio Medical University, Rootstown, OH, United States
| | - Rachida A Bouhenni
- Rebecca D. Considine Research Institute, Vision Center, Akron Children's Hospital, Akron, OH, United States
| | - Matthew A Smith
- Department of Pharmaceutical Sciences, Northeast Ohio Medical University, Rootstown, OH, United States.,Rebecca D. Considine Research Institute, Vision Center, Akron Children's Hospital, Akron, OH, United States
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26
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Ruesch A, Acharya D, Schmitt S, Yang J, Smith MA, Kainerstorfer JM. Comparison of static and dynamic cerebral autoregulation under anesthesia influence in a controlled animal model. PLoS One 2021; 16:e0245291. [PMID: 33418561 PMCID: PMC7794034 DOI: 10.1371/journal.pone.0245291] [Citation(s) in RCA: 11] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/10/2020] [Accepted: 12/25/2020] [Indexed: 12/30/2022] Open
Abstract
The brain’s ability to maintain cerebral blood flow approximately constant despite cerebral perfusion pressure changes is known as cerebral autoregulation (CA) and is governed by vasoconstriction and vasodilation. Cerebral perfusion pressure is defined as the pressure gradient between arterial blood pressure and intracranial pressure. Measuring CA is a challenging task and has created a variety of evaluation methods, which are often categorized as static and dynamic CA assessments. Because CA is quantified as the performance of a regulatory system and no physical ground truth can be measured, conflicting results are reported. The conflict further arises from a lack of healthy volunteer data with respect to cerebral perfusion pressure measurements and the variety of diseases in which CA ability is impaired, including stroke, traumatic brain injury and hydrocephalus. To overcome these differences, we present a healthy non-human primate model in which we can control the ability to autoregulate blood flow through the type of anesthesia (isoflurane vs fentanyl). We show how three different assessment methods can be used to measure CA impairment, and how static and dynamic autoregulation compare under challenges in intracranial pressure and blood pressure. We reconstructed Lassen’s curve for two groups of anesthesia, where only the fentanyl anesthetized group yielded the canonical shape. Cerebral perfusion pressure allowed for the best distinction between the fentanyl and isoflurane anesthetized groups. The autoregulatory response time to induced oscillations in intracranial pressure and blood pressure, measured as the phase lag between intracranial pressure and blood pressure, was able to determine autoregulatory impairment in agreement with static autoregulation. Static and dynamic CA both show impairment in high dose isoflurane anesthesia, while low isoflurane in combination with fentanyl anesthesia maintains CA, offering a repeatable animal model for CA studies.
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Affiliation(s)
- Alexander Ruesch
- Department of Biomedical Engineering, Carnegie Mellon University, Pittsburgh, Pennsylvania, United States of America
| | - Deepshikha Acharya
- Department of Biomedical Engineering, Carnegie Mellon University, Pittsburgh, Pennsylvania, United States of America
| | - Samantha Schmitt
- Department of Biomedical Engineering, Carnegie Mellon University, Pittsburgh, Pennsylvania, United States of America
- Neuroscience Institute, Carnegie Mellon University, Pittsburgh, Pennsylvania, United States of America
- Department of Ophthalmology, University of Pittsburgh, Pittsburgh, Pennsylvania, United States of America
| | - Jason Yang
- Department of Biomedical Engineering, Carnegie Mellon University, Pittsburgh, Pennsylvania, United States of America
| | - Matthew A Smith
- Department of Biomedical Engineering, Carnegie Mellon University, Pittsburgh, Pennsylvania, United States of America
- Neuroscience Institute, Carnegie Mellon University, Pittsburgh, Pennsylvania, United States of America
- Department of Ophthalmology, University of Pittsburgh, Pittsburgh, Pennsylvania, United States of America
| | - Jana M Kainerstorfer
- Department of Biomedical Engineering, Carnegie Mellon University, Pittsburgh, Pennsylvania, United States of America
- Neuroscience Institute, Carnegie Mellon University, Pittsburgh, Pennsylvania, United States of America
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27
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Simons ES, Smith MA, Dengler-Crish CM, Crish SD. Retinal ganglion cell loss and gliosis in the retinofugal projection following intravitreal exposure to amyloid-beta. Neurobiol Dis 2021; 147:105146. [PMID: 33122075 DOI: 10.1016/j.nbd.2020.105146] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/14/2020] [Revised: 10/09/2020] [Accepted: 10/23/2020] [Indexed: 01/07/2023] Open
Abstract
Pathological accumulations of amyloid-beta (Aβ) peptide are found in retina early in Alzheimer's disease, yet its effects on retinal neuronal structure remain unknown. To investigate this, we injected fibrillized Aβ1-42 protein into the eye of adult C57BL/6 J mice and analyzed the retina, optic nerve (ON), and the superior colliculus (SC), the primary retinal target in mice. We found that retinal Aβ exposure stimulated microglial activation and retinal ganglion cell (RGC) loss as early as 1-week post-injection. Pathology was not limited to the retina, but propagated into other areas of the central nervous system. Microgliosis spread throughout the retinal projection (retina, ON, and SC), with multiplex protein quantitation demonstrating an increase in endogenously produced Aβ in the ON and SC corresponding to the injected retinas. Surprisingly, this pathology spread to the opposite side, with unilateral Aβ eye injections driving increased Aβ levels, neuroinflammation, and RGC death in the opposite, un-injected retinal projection. As Aβ-mediated microglial activation has been shown to propagate Aβ pathology, we also investigated the role of the Aβ-binding microglial scavenger receptor CD36 in this pathology. Transgenic mice lacking the CD36 receptor were resistant to Aβ-induced inflammation and RGC death up to 2 weeks following exposure. These results indicate that Aβ pathology drives regional neuropathology in the retina and does not remain isolated to the affected eye, but spreads throughout the nervous system. Further, CD36 may serve as a promising target to prevent Aβ-mediated inflammatory damage.
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Affiliation(s)
- E S Simons
- Northeast Ohio Medical University, Rootstown, OH 44272, United States; Kent State Biomedical Sciences Graduate Program, Kent, OH 44240, United States
| | - M A Smith
- Northeast Ohio Medical University, Rootstown, OH 44272, United States; Kent State Biomedical Sciences Graduate Program, Kent, OH 44240, United States; Akron Children's Hospital, Rebecca D. Considine Research Institute, Akron, OH 44302, United States
| | - C M Dengler-Crish
- Northeast Ohio Medical University, Rootstown, OH 44272, United States; Kent State Biomedical Sciences Graduate Program, Kent, OH 44240, United States
| | - S D Crish
- Northeast Ohio Medical University, Rootstown, OH 44272, United States; Kent State Biomedical Sciences Graduate Program, Kent, OH 44240, United States.
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28
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Smith MA, Waugh DA, McBurney DL, George JC, Suydam RS, Thewissen JGM, Crish SD. A comparative analysis of cone photoreceptor morphology in bowhead and beluga whales. J Comp Neurol 2020; 529:2376-2390. [PMID: 33377221 DOI: 10.1002/cne.25101] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [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: 06/10/2020] [Revised: 12/21/2020] [Accepted: 12/22/2020] [Indexed: 12/30/2022]
Abstract
The cetacean visual system is a product of selection pressures favoring underwater vision, yet relatively little is known about it across taxa. Previous studies report several mutations in the opsin genetic sequence in cetaceans, suggesting the evolutionary complete or partial loss of retinal cone photoreceptor function in mysticete and odontocete lineages, respectively. Despite this, limited anatomical evidence suggests cone structures are partially maintained but with absent outer and inner segments in the bowhead retina. The functional consequence and anatomical distributions associated with these unique cone morphologies remain unclear. The current study further investigates the morphology and distribution of cone photoreceptors in the bowhead whale and beluga retina and evaluates the potential functional capacity of these cells' alternative to photoreception. Refined histological and advanced microscopic techniques revealed two additional cone morphologies in the bowhead and beluga retina that have not been previously described. Two proteins involved in magnetosensation were present in these cone structures suggesting the possibility for an alternative functional role in responding to changes in geomagnetic fields. These findings highlight a revised understanding of the unique evolution of cone and gross retinal anatomy in cetaceans, and provide prefatory evidence of potential functional reassignment of these cells.
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Affiliation(s)
- Matthew A Smith
- Department of Pharmaceutical Sciences, Northeast Ohio Medical University, Rootstown, Ohio, USA.,Rebecca D. Considine Research Institute, Akron Children's Hospital, Akron, Ohio, USA
| | - David A Waugh
- Department of Anatomy and Neurobiology, Northeast Ohio Medical University, Rootstown, Ohio, USA
| | - Denise L McBurney
- Department of Anatomy and Neurobiology, Northeast Ohio Medical University, Rootstown, Ohio, USA
| | - John C George
- Department of Wildlife Management, North Slope Borough, Utqiagvik, Alaska, USA
| | - Robert S Suydam
- Department of Wildlife Management, North Slope Borough, Utqiagvik, Alaska, USA
| | - Johannes G M Thewissen
- Department of Anatomy and Neurobiology, Northeast Ohio Medical University, Rootstown, Ohio, USA
| | - Samuel D Crish
- Department of Pharmaceutical Sciences, Northeast Ohio Medical University, Rootstown, Ohio, USA
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29
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Watters JM, Wright G, Smith MA, Shah B, Wright KL. Histone deacetylase 8 inhibition suppresses mantle cell lymphoma viability while preserving natural killer cell function. Biochem Biophys Res Commun 2020; 534:773-779. [PMID: 33190829 DOI: 10.1016/j.bbrc.2020.11.001] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/23/2020] [Accepted: 11/02/2020] [Indexed: 12/11/2022]
Abstract
Mantle Cell Lymphoma (MCL) is a non-Hodgkin lymphoma with a median survival rate of five years. Standard treatment with high-dose chemotherapy plus rituximab (anti-CD20 antibody) has extended overall survival although, the disease remains incurable. Histone deacetylases (HDAC) are a family of enzymes that regulate multiple proteins and cellular pathways through post-translational modification. Broad spectrum HDAC inhibitors have shown some therapeutic promise, inducing cell cycle inhibition and apoptosis in leukemia and non-Hodgkin's lymphoma. However, the therapeutic effects of these broad-spectrum HDAC inhibitors can detrimentally dampen Natural Killer (NK) cell cytotoxicity, reduce NK viability, and downregulate activation receptors important for NK mediated anti-tumor responses. Impairment of NK function in MCL patients during therapy potentially limits therapeutic activity of rituximab. Thus, there is an unmet need to decipher specific roles of individual HDACs in order to preserve and/or enhance NK function, while, directly impairing MCL viability. We investigated the impact of HDAC8 in MCL cell lines. Inhibition or genetic loss of HDAC8 caused MCL cells to undergo apoptosis. In contrast, exposure of primary human NK cells to an HDAC8 inhibitor does not alter viability, receptor expression, or antibody dependent cellular cytotoxicity (ADCC). However, an increase in effector cytokine interferon-gamma (IFNγ) producing NK cells was observed in response to HDAC8 inhibition. Taken together these data suggest that selective HDAC8 inhibitors may simultaneously preserve NK functional activity, while impairing MCL tumor growth, establishing a rationale for future clinical evaluation.
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Affiliation(s)
- January M Watters
- Department of Immunology, H. Lee Moffitt Cancer Center and Research Institute, Tampa, FL, USA; Cancer Biology Ph.D. Program, University of South Florida, Tampa, USA
| | - Gabriela Wright
- Department of Thoracic Oncology, H. Lee Moffitt Cancer Center and Research Institute, Tampa, FL, USA
| | - Matthew A Smith
- Department of Thoracic Oncology, H. Lee Moffitt Cancer Center and Research Institute, Tampa, FL, USA
| | - Bijal Shah
- Department of Malignant Hematology, H. Lee Moffitt Cancer Center and Research Institute, Tampa, FL, USA
| | - Kenneth L Wright
- Department of Immunology, H. Lee Moffitt Cancer Center and Research Institute, Tampa, FL, USA.
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30
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Cowley BR, Snyder AC, Acar K, Williamson RC, Yu BM, Smith MA. Slow Drift of Neural Activity as a Signature of Impulsivity in Macaque Visual and Prefrontal Cortex. Neuron 2020; 108:551-567.e8. [PMID: 32810433 PMCID: PMC7822647 DOI: 10.1016/j.neuron.2020.07.021] [Citation(s) in RCA: 49] [Impact Index Per Article: 12.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/17/2020] [Revised: 06/15/2020] [Accepted: 07/17/2020] [Indexed: 12/22/2022]
Abstract
An animal's decision depends not only on incoming sensory evidence but also on its fluctuating internal state. This state embodies multiple cognitive factors, such as arousal and fatigue, but it is unclear how these factors influence the neural processes that encode sensory stimuli and form a decision. We discovered that, unprompted by task conditions, animals slowly shifted their likelihood of detecting stimulus changes over the timescale of tens of minutes. Neural population activity from visual area V4, as well as from prefrontal cortex, slowly drifted together with these behavioral fluctuations. We found that this slow drift, rather than altering the encoding of the sensory stimulus, acted as an impulsivity signal, overriding sensory evidence to dictate the final decision. Overall, this work uncovers an internal state embedded in population activity across multiple brain areas and sheds further light on how internal states contribute to the decision-making process.
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Affiliation(s)
- Benjamin R Cowley
- Princeton Neuroscience Institute, Princeton University, Princeton, NJ 08544, USA; Center for the Neural Basis of Cognition, Pittsburgh, PA 15213, USA; Department of Machine Learning, Carnegie Mellon University, Pittsburgh, PA 15213, USA
| | - Adam C Snyder
- Center for the Neural Basis of Cognition, Pittsburgh, PA 15213, USA; Department of Electrical and Computer Engineering, Carnegie Mellon University, Pittsburgh, PA 15213, USA; Department of Brain and Cognitive Sciences, University of Rochester, Rochester, NY 14642, USA; Department of Neuroscience, University of Rochester, Rochester, NY 14642, USA; Center for Visual Science, University of Rochester, Rochester, NY 14642, USA
| | - Katerina Acar
- Center for the Neural Basis of Cognition, Pittsburgh, PA 15213, USA; Neuroscience Institute, Carnegie Mellon University, Pittsburgh, PA 15213, USA; Center for Neuroscience, University of Pittsburgh School of Medicine, Pittsburgh, PA 15213, USA
| | - Ryan C Williamson
- Center for the Neural Basis of Cognition, Pittsburgh, PA 15213, USA; Department of Machine Learning, Carnegie Mellon University, Pittsburgh, PA 15213, USA; University of Pittsburgh School of Medicine, Pittsburgh, PA 15213, USA
| | - Byron M Yu
- Center for the Neural Basis of Cognition, Pittsburgh, PA 15213, USA; Neuroscience Institute, Carnegie Mellon University, Pittsburgh, PA 15213, USA; Department of Electrical and Computer Engineering, Carnegie Mellon University, Pittsburgh, PA 15213, USA; Department of Biomedical Engineering, Carnegie Mellon University, Pittsburgh, PA 15213, USA
| | - Matthew A Smith
- Center for the Neural Basis of Cognition, Pittsburgh, PA 15213, USA; Neuroscience Institute, Carnegie Mellon University, Pittsburgh, PA 15213, USA; Department of Biomedical Engineering, Carnegie Mellon University, Pittsburgh, PA 15213, USA; Department of Ophthalmology, University of Pittsburgh, Pittsburgh, PA 15213, USA.
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Ruesch A, Schmitt S, Yang J, Smith MA, Kainerstorfer JM. Fluctuations in intracranial pressure can be estimated non-invasively using near-infrared spectroscopy in non-human primates. J Cereb Blood Flow Metab 2020; 40:2304-2314. [PMID: 31775565 PMCID: PMC7585930 DOI: 10.1177/0271678x19891359] [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] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Abstract
Intracranial pressure (ICP) is typically measured invasively through a sensor placed inside the brain or a needle inserted into the spinal canal, limiting the patient population on which this assessment can be performed. Currently, non-invasive methods are limited due to lack of sensitivity and thus only apply to extreme cases of increased ICP, instead of use in general clinical practice. We demonstrate a novel application for near-infrared spectroscopy (NIRS) to accurately estimate ICP changes over time. Using a non-human primate (Rhesus Macaque) model, we collected optical data while we induced ICP oscillations at multiple ICP levels obtained by manipulating the height of a fluid column connected via a catheter to the lateral ventricle. Hemodynamic responses to ICP changes were measured at the occipital pole and compared to changes detected by a conventional intraparenchymal ICP probe. We demonstrate that hemoglobin concentrations are highly correlated with induced ICP oscillations and that this response is frequency dependent. We translated the NIRS data into non-invasive ICP measurements via a fitted non-parametric transfer function, demonstrating a match in both magnitude and time alignment with an invasively measured reference. Our results demonstrate that NIRS has the potential for non-invasive ICP monitoring.
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Affiliation(s)
- Alexander Ruesch
- Department of Biomedical Engineering, Carnegie Mellon University, Pittsburgh, PA, USA
| | - Samantha Schmitt
- Department of Biomedical Engineering, Carnegie Mellon University, Pittsburgh, PA, USA.,Department of Ophthalmology, University of Pittsburgh, Pittsburgh, PA, USA
| | - Jason Yang
- Department of Biomedical Engineering, Carnegie Mellon University, Pittsburgh, PA, USA
| | - Matthew A Smith
- Department of Biomedical Engineering, Carnegie Mellon University, Pittsburgh, PA, USA.,Department of Ophthalmology, University of Pittsburgh, Pittsburgh, PA, USA.,Carnegie Mellon Neuroscience Institute, Carnegie Mellon University, Pittsburgh, PA, USA
| | - Jana M Kainerstorfer
- Department of Biomedical Engineering, Carnegie Mellon University, Pittsburgh, PA, USA.,Carnegie Mellon Neuroscience Institute, Carnegie Mellon University, Pittsburgh, PA, USA
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Abstract
Active vision is a fundamental process by which primates gather information about the external world. Multiple brain regions have been studied in the context of simple active vision tasks in which a visual target's appearance is temporally separated from saccade execution. Most neurons have tight spatial registration between visual and saccadic signals, and in areas such as prefrontal cortex (PFC), some neurons show persistent delay activity that links visual and motor epochs and has been proposed as a basis for spatial working memory. Many PFC neurons also show rich dynamics, which have been attributed to alternative working memory codes and the representation of other task variables. Our study investigated the transition between processing a visual stimulus and generating an eye movement in populations of PFC neurons in macaque monkeys performing a memory guided saccade task. We found that neurons in two subregions of PFC, the frontal eye fields (FEF) and area 8Ar, differed in their dynamics and spatial response profiles. These dynamics could be attributed largely to shifts in the spatial profile of visual and motor responses in individual neurons. This led to visual and motor codes for particular spatial locations that were instantiated by different mixtures of neurons, which could be important in PFC's flexible role in multiple sensory, cognitive, and motor tasks.NEW & NOTEWORTHY A central question in neuroscience is how the brain transitions from sensory representations to motor outputs. The prefrontal cortex contains neurons that have long been implicated as important in this transition and in working memory. We found evidence for rich and diverse tuning in these neurons, which was often spatially misaligned between visual and saccadic responses. This feature may play an important role in flexible working memory capabilities.
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Affiliation(s)
- Sanjeev B Khanna
- Department of Ophthalmology, University of Pittsburgh, Pittsburgh, Pennsylvania.,Center for the Neural Basis of Cognition, Pittsburgh, Pennsylvania.,Department of Bioengineering, University of Pittsburgh, Pittsburgh, Pennsylvania
| | - Jonathan A Scott
- Department of Bioengineering, University of Pittsburgh, Pittsburgh, Pennsylvania
| | - Matthew A Smith
- Department of Ophthalmology, University of Pittsburgh, Pittsburgh, Pennsylvania.,Center for the Neural Basis of Cognition, Pittsburgh, Pennsylvania.,Department of Bioengineering, University of Pittsburgh, Pittsburgh, Pennsylvania.,Department of Biomedical Engineering, Carnegie Mellon University, Pittsburgh, Pennsylvania.,Carnegie Mellon Neuroscience Institute, Pittsburgh, Pennsylvania
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33
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Polaske NW, Kelly BD, Smith MA, Haura EB, Belosludtsev YY. Fully Automated Protein Proximity Assay in Formalin-Fixed, Paraffin-Embedded Tissue Using Caged Haptens. Bioconjug Chem 2020; 31:1635-1640. [PMID: 32395983 DOI: 10.1021/acs.bioconjchem.0c00193] [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] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/21/2023]
Abstract
The ability to interrogate for the presence and distribution of protein-protein complexes (PPCs) is of high importance for the advancement of diagnostic capabilities such as determining therapeutic effects in the context of pharmaceutical development. Herein, we report a novel assay for detecting and visualizing PPCs on formalin-fixed, paraffin-embedded material using a caged hapten. To this end, we synthetically modified a nitropyrazole hapten with an alkaline phosphatase (AP)-responsive self-immolative caging group. The AP-labile caging group abrogates antibody binding; however, upon exposure to AP, the native hapten is regenerated. These caged haptens were applied in a proximity assay format by the use of a first antibody labeled with caged haptens that can be uncaged by AP conjugated to the second antibody. Only when the two epitopes of interest are in close proximity to one another will the AP interact with the caged hapten and uncage it. The native hapten, which represents the population of PPCs, was then visualized by an anti-hapten antibody conjugated to horseradish peroxidase, followed by diaminobenzidine detection. We provide proof of concept for the detection of protein proximity pairs (β-catenin-E-cadherin and EGFR-GRB2), and confirm assay specificity through technical controls involving reagent omission experiments, and biologically by treatment with small-molecule kinase inhibitors that interrupt kinase-adaptor complexes.
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Affiliation(s)
- Nathan W Polaske
- Tissue Research & Early Development, Roche Tissue Diagnostics, Tucson, Arizona 85755, United States
| | - Brian D Kelly
- Tissue Research & Early Development, Roche Tissue Diagnostics, Tucson, Arizona 85755, United States
| | - Matthew A Smith
- Department of Thoracic Oncology, Moffitt Cancer Center, Tampa, Florida 33612, United States
| | - Eric B Haura
- Department of Thoracic Oncology, Moffitt Cancer Center, Tampa, Florida 33612, United States
| | - Yuri Y Belosludtsev
- Tissue Research & Early Development, Roche Tissue Diagnostics, Tucson, Arizona 85755, United States
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34
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van Senten J, Smith MA, Engle CR. Impacts of COVID-19 on U.S. aquaculture, aquaponics, and allied businesses. J World Aquac Soc 2020; 51:574-577. [PMID: 32834474 PMCID: PMC7361439 DOI: 10.1111/jwas.12715] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/21/2023]
Affiliation(s)
- Jonathan van Senten
- Assistant Professor and Extension Specialist, Virginia Seafood AREC & Department of Agricultural and Applied Economics, Center for Coastal Studies Affiliate FacultyVirginia Tech, HamptonVirginiaUSA
| | - Matthew A. Smith
- Extension Aquaculture Specialist, College of Food, Agricultural, and Environmental SciencesThe Ohio State University, ColumbusOhioUSA
| | - Carole R. Engle
- Engle‐Stone Aquatic$ LLC, Adjunct faculty, Virginia Seafood ARECVirginia Tech University, HamptonVirginiaUSA
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35
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Issar D, Williamson RC, Khanna SB, Smith MA. A neural network for online spike classification that improves decoding accuracy. J Neurophysiol 2020; 123:1472-1485. [PMID: 32101491 PMCID: PMC7191521 DOI: 10.1152/jn.00641.2019] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/08/2019] [Revised: 02/26/2020] [Accepted: 02/26/2020] [Indexed: 11/22/2022] Open
Abstract
Separating neural signals from noise can improve brain-computer interface performance and stability. However, most algorithms for separating neural action potentials from noise are not suitable for use in real time and have shown mixed effects on decoding performance. With the goal of removing noise that impedes online decoding, we sought to automate the intuition of human spike-sorters to operate in real time with an easily tunable parameter governing the stringency with which spike waveforms are classified. We trained an artificial neural network with one hidden layer on neural waveforms that were hand-labeled as either spikes or noise. The network output was a likelihood metric for each waveform it classified, and we tuned the network's stringency by varying the minimum likelihood value for a waveform to be considered a spike. Using the network's labels to exclude noise waveforms, we decoded remembered target location during a memory-guided saccade task from electrode arrays implanted in prefrontal cortex of rhesus macaque monkeys. The network classified waveforms in real time, and its classifications were qualitatively similar to those of a human spike-sorter. Compared with decoding with threshold crossings, in most sessions we improved decoding performance by removing waveforms with low spike likelihood values. Furthermore, decoding with our network's classifications became more beneficial as time since array implantation increased. Our classifier serves as a feasible preprocessing step, with little risk of harm, that could be applied to both off-line neural data analyses and online decoding.NEW & NOTEWORTHY Although there are many spike-sorting methods that isolate well-defined single units, these methods typically involve human intervention and have inconsistent effects on decoding. We used human classified neural waveforms as training data to create an artificial neural network that could be tuned to separate spikes from noise that impaired decoding. We found that this network operated in real time and was suitable for both off-line data processing and online decoding.
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Affiliation(s)
- Deepa Issar
- Department of Bioengineering, University of Pittsburgh, Pittsburgh, Pennsylvania
- University of Pittsburgh School of Medicine, University of Pittsburgh, Pittsburgh, Pennsylvania
| | - Ryan C Williamson
- University of Pittsburgh School of Medicine, University of Pittsburgh, Pittsburgh, Pennsylvania
- Department of Machine Learning, Carnegie Mellon University, Pittsburgh, Pennsylvania
- Carnegie Mellon Neuroscience Institute, Pittsburgh, Pennsylvania
| | - Sanjeev B Khanna
- Department of Bioengineering, University of Pittsburgh, Pittsburgh, Pennsylvania
| | - Matthew A Smith
- Department of Biomedical Engineering, Carnegie Mellon University, Pittsburgh, Pennsylvania
- Carnegie Mellon Neuroscience Institute, Pittsburgh, Pennsylvania
- Department of Ophthalmology, University of Pittsburgh School of Medicine, University of Pittsburgh, Pittsburgh, Pennsylvania
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36
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Ruesch A, Yang J, Schmitt S, Acharya D, Smith MA, Kainerstorfer JM. Estimating intracranial pressure using pulsatile cerebral blood flow measured with diffuse correlation spectroscopy. Biomed Opt Express 2020; 11:1462-1476. [PMID: 32206422 PMCID: PMC7075623 DOI: 10.1364/boe.386612] [Citation(s) in RCA: 32] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/23/2019] [Revised: 02/11/2020] [Accepted: 02/12/2020] [Indexed: 05/08/2023]
Abstract
Measuring intracranial pressure (ICP) is necessary for the treatment of severe head injury but measurement systems are highly invasive and introduce risk of infection and complications. We developed a non-invasive alternative for quantifying ICP using measurements of cerebral blood flow (CBF) by diffuse correlation spectroscopy. The recorded cardiac pulsation waveform in CBF undergoes morphological changes in response to ICP changes. We used the pulse shape to train a randomized regression forest to estimate the underlying ICP and demonstrate in five non-human primates that DCS-based estimation can explain over 90% of the variance in invasively measured ICP.
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Affiliation(s)
- Alexander Ruesch
- Department of Biomedical Engineering, Carnegie Mellon University, 5000 Forbes Avenue, Pittsburgh, PA 15213, USA
| | - Jason Yang
- Department of Biomedical Engineering, Carnegie Mellon University, 5000 Forbes Avenue, Pittsburgh, PA 15213, USA
| | - Samantha Schmitt
- Department of Biomedical Engineering, Carnegie Mellon University, 5000 Forbes Avenue, Pittsburgh, PA 15213, USA
- Neuroscience Institute, Carnegie Mellon University, 4400 Fifth Avenue, Pittsburgh, PA 15213, USA
- Department of Ophthalmology, University of Pittsburgh, 203 Lothrop Street, Pittsburgh, PA 15213, USA
| | - Deepshikha Acharya
- Department of Biomedical Engineering, Carnegie Mellon University, 5000 Forbes Avenue, Pittsburgh, PA 15213, USA
| | - Matthew A. Smith
- Department of Biomedical Engineering, Carnegie Mellon University, 5000 Forbes Avenue, Pittsburgh, PA 15213, USA
- Neuroscience Institute, Carnegie Mellon University, 4400 Fifth Avenue, Pittsburgh, PA 15213, USA
- Department of Ophthalmology, University of Pittsburgh, 203 Lothrop Street, Pittsburgh, PA 15213, USA
| | - Jana M. Kainerstorfer
- Department of Biomedical Engineering, Carnegie Mellon University, 5000 Forbes Avenue, Pittsburgh, PA 15213, USA
- Neuroscience Institute, Carnegie Mellon University, 4400 Fifth Avenue, Pittsburgh, PA 15213, USA
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37
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Shishkina EA, Timofeev YS, Volchkova AY, Sharagin PA, Zalyapin VI, Degteva MO, Smith MA, Napier BA. Trabecula: A Random Generator of Computational Phantoms for Bone Marrow Dosimetry. Health Phys 2020; 118:53-59. [PMID: 31764420 DOI: 10.1097/hp.0000000000001127] [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] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
This study was motivated by the efforts to evaluate radiation risk for leukemia incidence in the Techa River cohort, where the main bone marrow dose contributors were Sr (bone-seeking beta emitters). Energy deposition in bone marrow targets was evaluated by simulating radiation particle transport using computational phantoms. The present paper describes the computer program Trabecula implementing an algorithm for parametric generation of computational phantoms, which serve as the basis for calculating bone marrow doses. Trabecula is a user-friendly tool that automatically converts analytical models into voxelized representations that are directly compatible as input to Monte Carlo N Particle code.
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Affiliation(s)
| | - Y S Timofeev
- Urals Research Centre for Radiation Medicine (URCRM), Chelyabinsk, Russia
| | - A Y Volchkova
- Urals Research Centre for Radiation Medicine (URCRM), Chelyabinsk, Russia
| | - P A Sharagin
- Urals Research Centre for Radiation Medicine (URCRM), Chelyabinsk, Russia
| | - V I Zalyapin
- Southern Urals State University (SUSU), Chelyabinsk, Russia
| | - M O Degteva
- Urals Research Centre for Radiation Medicine (URCRM), Chelyabinsk, Russia
| | - M A Smith
- Pacific Northwest National Laboratory, Richland, WA
| | - B A Napier
- Pacific Northwest National Laboratory, Richland, WA
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38
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Acar K, Kiorpes L, Movshon JA, Smith MA. Altered functional interactions between neurons in primary visual cortex of macaque monkeys with experimental amblyopia. J Neurophysiol 2019; 122:2243-2258. [PMID: 31553685 PMCID: PMC6966320 DOI: 10.1152/jn.00232.2019] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/09/2019] [Revised: 09/24/2019] [Accepted: 09/24/2019] [Indexed: 11/22/2022] Open
Abstract
Amblyopia, a disorder in which vision through one of the eyes is degraded, arises because of defective processing of information by the visual system. Amblyopia often develops in humans after early misalignment of the eyes (strabismus) and can be simulated in macaque monkeys by artificially inducing strabismus. In such amblyopic animals, single-unit responses in primary visual cortex (V1) are appreciably reduced when evoked by the amblyopic eye compared with the other (fellow) eye. However, this degradation in single V1 neuron responsivity is not commensurate with the marked losses in visual sensitivity and resolution measured behaviorally. Here we explored the idea that changes in patterns of coordinated activity across populations of V1 neurons may contribute to degraded visual representations in amblyopia, potentially making it more difficult to read out evoked activity to support perceptual decisions. We studied the visually evoked activity of V1 neuronal populations in three macaques (Macaca nemestrina) with strabismic amblyopia and in one control animal. Activity driven through the amblyopic eye was diminished, and these responses also showed more interneuronal correlation at all stimulus contrasts than responses driven through the fellow eye or responses in the control animal. A decoding analysis showed that responses driven through the amblyopic eye carried less visual information than other responses. Our results suggest that part of the reduced visual capacity of amblyopes may be due to changes in the patterns of functional interaction among neurons in V1.NEW & NOTEWORTHY Previous work on the neurophysiological basis of amblyopia has largely focused on relating behavioral deficits to changes in visual processing by single neurons in visual cortex. In this study, we recorded simultaneously from populations of primary visual cortical (V1) neurons in macaques with amblyopia. We found changes in the strength and pattern of shared response variability between neurons. These changes in neuronal interactions could impair the visual representations of V1 populations driven by the amblyopic eye.
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Affiliation(s)
- Katerina Acar
- Center for the Neural Basis of Cognition, Pittsburgh, Pennsylvania
- Center for Neuroscience, University of Pittsburgh, Pittsburgh, Pennsylvania
| | - Lynne Kiorpes
- Center for Neural Science, New York University, New York, New York
| | | | - Matthew A Smith
- Center for the Neural Basis of Cognition, Pittsburgh, Pennsylvania
- Center for Neuroscience, University of Pittsburgh, Pittsburgh, Pennsylvania
- Department of Biomedical Engineering, Carnegie Mellon University, Pittsburgh, Pennsylvania
- Carnegie Mellon Neuroscience Institute, Pittsburgh, Pennsylvania
- Department of Ophthalmology, University of Pittsburgh, Pittsburgh, Pennsylvania
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39
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Degteva MO, Napier BA, Tolstykh EI, Shishkina EA, Shagina NB, Volchkova AY, Bougrov NG, Smith MA, Anspaugh LR. Enhancements in the Techa River Dosimetry System: TRDS-2016D Code for Reconstruction of Deterministic Estimates of Dose From Environmental Exposures. Health Phys 2019; 117:378-387. [PMID: 30958804 DOI: 10.1097/hp.0000000000001067] [Citation(s) in RCA: 9] [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] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
Waterborne releases to the Techa River from the Mayak plutonium facility in Russia during 1949-1956 resulted in significant doses to persons living downstream. The dosimetry system Techa River Dosimetry System-2016D has been developed, which provides individual doses of external and internal exposure for the members of the Techa River cohort and other persons who were exposed to releases of radioactive material to the Southern Urals. The results of computation of individual doses absorbed in red bone marrow and extraskeletal tissues for the Techa River cohort members (29,647 persons) are presented, which are based on residence histories on the contaminated Techa River and the East Urals Radioactive Trace, which was formed in 1957 as a result of the Kyshtym Accident. Available Sr body-burden measurements and available information on individual household locations have been used for refinement of individual dose estimates. Techa River Dosimetry System-2016D-based dose estimates will be used for verification of risk of low-dose-rate effects of ionizing radiation in the Techa River cohort.
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Affiliation(s)
- M O Degteva
- Urals Research Center for Radiation Medicine, Chelyabinsk, Russia
| | - B A Napier
- Battelle Pacific Northwest National Laboratory, Richland, WA
| | - E I Tolstykh
- Urals Research Center for Radiation Medicine, Chelyabinsk, Russia
| | - E A Shishkina
- Urals Research Center for Radiation Medicine, Chelyabinsk, Russia
| | - N B Shagina
- Urals Research Center for Radiation Medicine, Chelyabinsk, Russia
| | - A Yu Volchkova
- Urals Research Center for Radiation Medicine, Chelyabinsk, Russia
| | - N G Bougrov
- Urals Research Center for Radiation Medicine, Chelyabinsk, Russia
| | - M A Smith
- Battelle Pacific Northwest National Laboratory, Richland, WA
| | - L R Anspaugh
- Emeritus, Department of Radiology, University of Utah, Salt Lake City, UT
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40
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Johnston R, Smith MA. Fixational eye movements index slow fluctuations of activity in macaque visual cortex. J Vis 2019. [DOI: 10.1167/19.10.85c] [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: 11/24/2022] Open
Affiliation(s)
- Richard Johnston
- Department of Ophthalmology, University of Pittsburgh
- Center for the Neural Basis of Cognition, University of Pittsburgh and Carnegie Mellon University
| | - Matthew A Smith
- Department of Ophthalmology, University of Pittsburgh
- Center for the Neural Basis of Cognition, University of Pittsburgh and Carnegie Mellon University
- Department of Bioengineering, University of Pittsburgh
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Kelly RJ, Zaidi AH, Smith MA, Omstead AN, Kosovec JE, Matsui D, Martin SA, DiCarlo C, Werts ED, Silverman JF, Wang DH, Jobe BA. The Dynamic and Transient Immune Microenvironment in Locally Advanced Esophageal Adenocarcinoma Post Chemoradiation. Ann Surg 2019; 268:992-999. [PMID: 28806299 DOI: 10.1097/sla.0000000000002410] [Citation(s) in RCA: 69] [Impact Index Per Article: 13.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
OBJECTIVE The aim of this study was to assess the impact of chemoradiation on the immune microenvironment to influence and optimally design future neoadjuvant clinical trials. SUMMARY BACKGROUND DATA Programmed death (PD)-1 inhibitors in metastatic gastroesophageal cancer have demonstrated response rates of approximately 25% in programmed death ligand-1 (PD-L1+) tumors. Unfortunately, the majority of patients do not respond. Therefore, a rationale strategy of combining immunotherapeutic agents with chemoradiation in earlier stage esophageal cancer may prevent metastatic disease in patients. METHODS To determine the effects of chemoradiation on resected esophageal adenocarcinomas, we examined the immune microenvironment pre- and post-chemoradiation using immunohistochemistry, quantitative reverse transcriptase polymerase chain reaction (qRT-PCR), and functional analysis of tumor-infiltrating lymphocytes. Additionally, to assess the duration and dependency of radiation-induced PD-L1 upregulation, a surgical rat reflux model of esophageal adenocarcinoma is used. First, tumor-bearing animals were dosed with single-fraction 13Gy or 16Gy radiation to determine safety, dose correlation, and PD-L1 upregulation using qRT-PCR post-radiation. Next, longitudinal PD-L1 expression levels within individual animals were determined using serial endoscopic biopsies at baseline, 1, 5, and 9 weeks post 16Gy radiation. RESULTS The majority of cancers displayed enhanced interferon γ and activated CD8+ T lymphocytes at the tumor stroma interface. These tumors also demonstrated enhanced upregulation of PD-L1 and multiple other immune checkpoints including TIM3, GITR, IDO1, LAG3, OX40, and KIR. The animal model results indicated PD-L1 upregulation is dose-dependent and transiently elevated post radiation exposure. CONCLUSIONS Collectively, these findings provide insights into the evolving immune landscape after chemoradiation and have significant implications for neoadjuvant trial designs that will combine radiotherapy with immune checkpoint inhibitors.
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Affiliation(s)
- Ronan J Kelly
- Department of Oncology, Sidney Kimmel Comprehensive Cancer Center, The Johns Hopkins Hospital, Baltimore, MD
| | - Ali H Zaidi
- Esophageal and Lung Institute, Allegheny Health Network, Pittsburgh, PA, United States
| | - Matthew A Smith
- Department of Pathology and Laboratory Medicine, Allegheny Health Network, Pittsburgh, PA
| | - Ashten N Omstead
- Esophageal and Lung Institute, Allegheny Health Network, Pittsburgh, PA, United States
| | - Juliann E Kosovec
- Esophageal and Lung Institute, Allegheny Health Network, Pittsburgh, PA, United States
| | - Daisuke Matsui
- Esophageal and Lung Institute, Allegheny Health Network, Pittsburgh, PA, United States
| | - Samantha A Martin
- Esophageal and Lung Institute, Allegheny Health Network, Pittsburgh, PA, United States
| | - Christina DiCarlo
- Department of Pathology and Laboratory Medicine, Allegheny Health Network, Pittsburgh, PA
| | - E Day Werts
- Division of Radiation Oncology, Allegheny Health Network, Pittsburgh, PA
| | - Jan F Silverman
- Department of Pathology and Laboratory Medicine, Allegheny Health Network, Pittsburgh, PA
| | - David H Wang
- Esophageal Diseases Center, VA North Texas Health Care System and University of Texas Southwestern Medical Center, Dallas, TX
| | - Blair A Jobe
- Esophageal and Lung Institute, Allegheny Health Network, Pittsburgh, PA, United States
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42
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Babar L, Kosovec JE, Jahangiri V, Chowdhury N, Zheng P, Omstead AN, Salvitti MS, Smith MA, Goel A, Kelly RJ, Jobe BA, Zaidi AH. Prognostic immune markers for recurrence and survival in locally advanced esophageal adenocarcinoma. Oncotarget 2019; 10:4546-4555. [PMID: 31360303 PMCID: PMC6642049 DOI: 10.18632/oncotarget.27052] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/03/2019] [Accepted: 06/14/2019] [Indexed: 01/09/2023] Open
Abstract
Treatment options and risk stratification for esophageal adenocarcinomas (EAC) currently rely on pathological criteria such as tumor staging. However, with advancement in immune modulated treatments, there is a need for accurate predictive biomarkers that will help identify high-risk patients and provide novel therapeutic targets. Hence, we analyzed as prognostic classifiers a host of histopathological parameters in conjunction with novel immune biomarkers. Specifically, gene expression levels for CXCL9, IDO1, LAG3, and TIM3 were established in treatment naïve samples. Additionally, PD-L1 and CD8 positivity was determined by immunohistochemical staining. Based on our finding, a Cox model consisting of pathological complete response (CR), LAG3, and CXCL9 provided improved predictability for disease-free survival (DFS) compared to CR alone, and it demonstrated statistical significance for predictability of recurrence (p=0.0001). Likewise, for overall survival (OS), a Cox model constituted of TIM3, CR, and IDO1 performed better than CR alone, and it demonstrated statistical significance for predictability of survival (p = 0.0004). TIM3 was identified as the best predictor for OS (HR=4.43, p=0.0023). In conclusion, given the paucity of treatment options for EAC, evaluation of these biomarkers early in the disease course will lead to better risk stratification of patients and much needed alternatives for improved therapy.
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Affiliation(s)
- Laila Babar
- Esophageal and Lung Institute, Allegheny Health Network, Pittsburgh, PA, USA
| | - Juliann E Kosovec
- Esophageal and Lung Institute, Allegheny Health Network, Pittsburgh, PA, USA
| | - Vida Jahangiri
- Esophageal and Lung Institute, Allegheny Health Network, Pittsburgh, PA, USA
| | - Nobel Chowdhury
- Esophageal and Lung Institute, Allegheny Health Network, Pittsburgh, PA, USA
| | - Ping Zheng
- Esophageal and Lung Institute, Allegheny Health Network, Pittsburgh, PA, USA
| | - Ashten N Omstead
- Esophageal and Lung Institute, Allegheny Health Network, Pittsburgh, PA, USA
| | - Madison S Salvitti
- Esophageal and Lung Institute, Allegheny Health Network, Pittsburgh, PA, USA
| | - Matthew A Smith
- Esophageal and Lung Institute, Allegheny Health Network, Pittsburgh, PA, USA
| | - Ajay Goel
- Beckman Research Institute, City of Hope Comprehensive Cancer Center, Monrovia, CA, USA
| | - Ronan J Kelly
- Department of Hematology and Oncology, Charles A. Sammons Cancer Center, Baylor University Medical Center, Dallas, TX, USA
| | - Blair A Jobe
- Esophageal and Lung Institute, Allegheny Health Network, Pittsburgh, PA, USA
| | - Ali H Zaidi
- Esophageal and Lung Institute, Allegheny Health Network, Pittsburgh, PA, USA
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Coba GA, Zaman S, Teer JK, Robinson T, Li R, Zhang J, Knepper TC, Spiess PE, Sexton W, Smith MA, Fishman MN, Pow-Sang JM, Poch MA, Gilbert SM, Magliocco AM, Boyle TA, Manley BJ. Abstract 2632: Increased recurrence and clinical grade in renal cell carcinomas associated with novel EGFR splice variants. Cancer Res 2019. [DOI: 10.1158/1538-7445.am2019-2632] [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: It is well established that alterations of epidermal growth factor receptor (EGFR) are associated with the development and progression of epithelial tumors across several cancer types. Alternative splicing and alterations of EGFR splice sites can cause translational changes and EGFR alterations have historically demonstrated associations with clinical and therapeutic outcomes in lung cancer.
Objectives: To evaluate the prevalence and clinical significance of recently identified novel ΔEGFR-TKF splice variant in 102 renal cell carcinoma (RCC) tumors
Methods: The majority of the RCC samples were RNA sequenced through the Orien AVATAR™ pipeline, and 7 additional cases were analyzed through Moffitt STAR™. Moffitt STAR™ and AVATAR™ are next generation targeted sequencing assay that include both DNA and RNA analyses. Frequency tables were generated using the data collected. The Grehan-Breslow-Wilcoxon test was used to compare recurrence free survival (RFS) due to the higher weight given to survival difference at earlier time points. The rationale being that the majority of recurrence events occurred earlier than 25 months in EGFR ≥5% cases and 50 months in the EGFR <5% cases compared to the follow-up times of 75 months and 125 months in the study cohort.
Results: We identified a EGFR gene splice variant, predominantly c.2470-188_c.2470-2, between exons 20 and 21 in RCCs subjected to the sequencing assay. Of 1075 solid tumors analyzed, the presence of the EGFR gene splice variant was observed, in any amount, within 74 of 102 RCC cases (72.5%), with the only exceptions being one multiple myeloma and sarcoma case. Using an EGFR slice variant cutoff of ≥5%, 33 of 102 (32.4%) RCC were chosen to be further investigated. Upon further analysis, 32 EGFR slice variant tumors were clear cell RCC, while 1 was papillary type II RCC. Thirty cases involving ≥5% slice variants were clinically staged revealed 6 T1, 8 T2, and 16 T3/4 cases compared to tumors with <5% of the splice variants which were staged 28 T1, 10 T2, 21 T3/4, and 8 Tx (p=.011). The RFS curve trended to worse outcomes for patients with ≥5% EGFR splice variants compared to <5% EGFR splice variants (p=.0315). All variants were identified at the RNA level without obvious corresponding DNA alterations. There was an average of 106 unique reads (average of 7.7% of all reads) for these cases supporting this variant.
Conclusion: EGFR splice variants in RCC are a relatively frequent and specific molecular alteration. This novel splice variant may prove to be significant as a druggable target or as part of a kidney cancer screening protocol.
Citation Format: George A. Coba, Saif Zaman, Jamie K. Teer, Timothy Robinson, Roger Li, Jingsong Zhang, Todd C. Knepper, Philippe E. Spiess, Wade Sexton, Matthew A. Smith, Mayer N. Fishman, Julio M. Pow-Sang, Michael A. Poch, Scott M. Gilbert, Anthony M. Magliocco, Theresa A. Boyle, Brandon J. Manley. Increased recurrence and clinical grade in renal cell carcinomas associated with novel EGFR splice variants [abstract]. In: Proceedings of the American Association for Cancer Research Annual Meeting 2019; 2019 Mar 29-Apr 3; Atlanta, GA. Philadelphia (PA): AACR; Cancer Res 2019;79(13 Suppl):Abstract nr 2632.
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Affiliation(s)
- George A. Coba
- H. Lee Moffitt Cancer Center & Research Institute, Temple Terrace, FL
| | - Saif Zaman
- H. Lee Moffitt Cancer Center & Research Institute, Temple Terrace, FL
| | - Jamie K. Teer
- H. Lee Moffitt Cancer Center & Research Institute, Temple Terrace, FL
| | - Timothy Robinson
- H. Lee Moffitt Cancer Center & Research Institute, Temple Terrace, FL
| | - Roger Li
- H. Lee Moffitt Cancer Center & Research Institute, Temple Terrace, FL
| | - Jingsong Zhang
- H. Lee Moffitt Cancer Center & Research Institute, Temple Terrace, FL
| | - Todd C. Knepper
- H. Lee Moffitt Cancer Center & Research Institute, Temple Terrace, FL
| | | | - Wade Sexton
- H. Lee Moffitt Cancer Center & Research Institute, Temple Terrace, FL
| | - Matthew A. Smith
- H. Lee Moffitt Cancer Center & Research Institute, Temple Terrace, FL
| | - Mayer N. Fishman
- H. Lee Moffitt Cancer Center & Research Institute, Temple Terrace, FL
| | - Julio M. Pow-Sang
- H. Lee Moffitt Cancer Center & Research Institute, Temple Terrace, FL
| | - Michael A. Poch
- H. Lee Moffitt Cancer Center & Research Institute, Temple Terrace, FL
| | - Scott M. Gilbert
- H. Lee Moffitt Cancer Center & Research Institute, Temple Terrace, FL
| | | | - Theresa A. Boyle
- H. Lee Moffitt Cancer Center & Research Institute, Temple Terrace, FL
| | - Brandon J. Manley
- H. Lee Moffitt Cancer Center & Research Institute, Temple Terrace, FL
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Hudspeth K, Wang S, Wang J, Rahman S, Smith MA, Casey KA, Manna Z, Sanjuan M, Kolbeck R, Hasni S, Ettinger R, Siegel RM. Natural killer cell expression of Ki67 is associated with elevated serum IL-15, disease activity and nephritis in systemic lupus erythematosus. Clin Exp Immunol 2019; 196:226-236. [PMID: 30693467 DOI: 10.1111/cei.13263] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 11/13/2018] [Indexed: 12/13/2022] Open
Abstract
Systemic lupus erythematosus (SLE) is a complex autoimmune disorder whose pathology involves multiple immune cell types, including B and T lymphocytes as well as myeloid cells. While it is clear that autoantibody-producing B cells, as well as CD4+ T cell help, are key contributors to disease, little is known regarding the role of innate lymphoid cells such as natural killer (NK) cells in the pathogenesis of SLE. We have characterized the phenotype of NK cells by multi-color flow cytometry in a large cohort of SLE patients. While the overall percentage of NK cells was similar or slightly decreased compared to healthy controls, a subset of patients displayed a high frequency of NK cells expressing the proliferation marker, Ki67, which was not found in healthy donors. Although expression of Ki67 on NK cells correlated with Ki67 on other immune cell subsets, the frequency of Ki67 on NK cells was considerably higher. Increased frequencies of Ki67+ NK cells correlated strongly with clinical severity and active nephritis and was also related to low NK cell numbers, but not overall leukopenia. Proteomic and functional data indicate that the cytokine interleukin-15 promotes the induction of Ki67 on NK cells. These results suggest a role for NK cells in regulating the immune-mediated pathology of SLE as well as reveal a possible target for therapeutic intervention.
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Affiliation(s)
- K Hudspeth
- Immunoregulation Section, Autoimmunity Branch, National Institute of Arthritis and Musculoskeletal and Skin Diseases (NIAMS), National Institutes of Health, Bethesda, MD, USA
| | - S Wang
- Respiratory, Inflammation, and Autoimmunity Group, MedImmune LLC, Gaithersburg, MD, USA
| | - J Wang
- Respiratory, Inflammation, and Autoimmunity Group, MedImmune LLC, Gaithersburg, MD, USA
| | - S Rahman
- Respiratory, Inflammation, and Autoimmunity Group, MedImmune LLC, Gaithersburg, MD, USA
| | - M A Smith
- Respiratory, Inflammation, and Autoimmunity Group, MedImmune LLC, Gaithersburg, MD, USA
| | - K A Casey
- Respiratory, Inflammation, and Autoimmunity Group, MedImmune LLC, Gaithersburg, MD, USA
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- Respiratory, Inflammation, and Autoimmunity Group, MedImmune LLC, Gaithersburg, MD, USA
| | - Z Manna
- Office of the Clinical Director, National Institute of Arthritis and Musculoskeletal and Skin Diseases (NIAMS), National Institutes of Health, Bethesda, Maryland, USA
| | - M Sanjuan
- Respiratory, Inflammation, and Autoimmunity Group, MedImmune LLC, Gaithersburg, MD, USA
| | - R Kolbeck
- Respiratory, Inflammation, and Autoimmunity Group, MedImmune LLC, Gaithersburg, MD, USA
| | - S Hasni
- Office of the Clinical Director, National Institute of Arthritis and Musculoskeletal and Skin Diseases (NIAMS), National Institutes of Health, Bethesda, Maryland, USA
| | - R Ettinger
- Respiratory, Inflammation, and Autoimmunity Group, MedImmune LLC, Gaithersburg, MD, USA
| | - R M Siegel
- Immunoregulation Section, Autoimmunity Branch, National Institute of Arthritis and Musculoskeletal and Skin Diseases (NIAMS), National Institutes of Health, Bethesda, MD, USA.,Office of the Clinical Director, National Institute of Arthritis and Musculoskeletal and Skin Diseases (NIAMS), National Institutes of Health, Bethesda, Maryland, USA
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Tran H, Wallace J, Zhu Z, Lucy KA, Voorhees AP, Schmitt SE, Bilonick RA, Schuman JS, Smith MA, Wollstein G, Sigal IA. Seeing the Hidden Lamina: Effects of Exsanguination on the Optic Nerve Head. Invest Ophthalmol Vis Sci 2019; 59:2564-2575. [PMID: 29847664 PMCID: PMC5968837 DOI: 10.1167/iovs.17-23356] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022] Open
Abstract
Purpose To introduce an experimental approach for direct comparison of the primate optic nerve head (ONH) before and after death by exsanguination. Method The ONHs of four eyes from three monkeys were imaged with spectral-domain optical coherence tomography (OCT) before and after exsanguination under controlled IOP. ONH structures, including the Bruch membrane (BM), BM opening, inner limiting membrane (ILM), and anterior lamina cribrosa (ALC) were delineated on 18 virtual radial sections per OCT scan. Thirteen parameters were analyzed: scleral canal at BM opening (area, planarity, and aspect ratio), ILM depth, BM depth; ALC (depth, shape index, and curvedness), and ALC visibility (globally, superior, inferior, nasal, and temporal quadrants). Results All four ALC quadrants had a statistically significant improvement in visibility after exsanguination (overall P < 0.001). ALC visibility increased by 35% globally and by 36%, 37%, 14%, and 4% in the superior, inferior, nasal, and temporal quadrants, respectively. ALC increased 4.1%, 1.9%, and 0.1% in curvedness, shape index, and depth, respectively. Scleral canals increased 7.2%, 25.2%, and 1.1% in area, planarity, and aspect ratio, respectively. ILM and BM depths averaged -7.5% and -55.2% decreases in depth, respectively. Most, but not all, changes were beyond the repeatability range. Conclusions Exsanguination allows for improved lamina characterization, especially in regions typically blocked by shadowing in OCT. The results also demonstrate changes in ONH morphology due to the loss of blood pressure. Future research will be needed to determine whether there are differences in ONH biomechanics before and after exsanguination and what those differences would imply.
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Affiliation(s)
- Huong Tran
- Department of Bioengineering, University of Pittsburgh, Pittsburgh, Pennsylvania, United States.,Department of Ophthalmology, University of Pittsburgh, Pittsburgh, Pennsylvania, United States
| | - Jacob Wallace
- Department of Ophthalmology, University of Pittsburgh, Pittsburgh, Pennsylvania, United States
| | - Ziyi Zhu
- Department of Ophthalmology, University of Pittsburgh, Pittsburgh, Pennsylvania, United States
| | - Katie A Lucy
- New York University Langone Eye Center, NYU School of Medicine, New York, New York, United States
| | - Andrew P Voorhees
- Department of Ophthalmology, University of Pittsburgh, Pittsburgh, Pennsylvania, United States
| | - Samantha E Schmitt
- Department of Ophthalmology, University of Pittsburgh, Pittsburgh, Pennsylvania, United States
| | - Richard A Bilonick
- Department of Ophthalmology, University of Pittsburgh, Pittsburgh, Pennsylvania, United States
| | - Joel S Schuman
- New York University Langone Eye Center, NYU School of Medicine, New York, New York, United States
| | - Matthew A Smith
- Department of Bioengineering, University of Pittsburgh, Pittsburgh, Pennsylvania, United States.,Department of Ophthalmology, University of Pittsburgh, Pittsburgh, Pennsylvania, United States
| | - Gadi Wollstein
- New York University Langone Eye Center, NYU School of Medicine, New York, New York, United States
| | - Ian A Sigal
- Department of Bioengineering, University of Pittsburgh, Pittsburgh, Pennsylvania, United States.,Department of Ophthalmology, University of Pittsburgh, Pittsburgh, Pennsylvania, United States
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Williamson RC, Doiron B, Smith MA, Yu BM. Bridging large-scale neuronal recordings and large-scale network models using dimensionality reduction. Curr Opin Neurobiol 2019; 55:40-47. [PMID: 30677702 DOI: 10.1016/j.conb.2018.12.009] [Citation(s) in RCA: 32] [Impact Index Per Article: 6.4] [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: 06/03/2018] [Revised: 12/16/2018] [Accepted: 12/17/2018] [Indexed: 12/21/2022]
Abstract
A long-standing goal in neuroscience has been to bring together neuronal recordings and neural network modeling to understand brain function. Neuronal recordings can inform the development of network models, and network models can in turn provide predictions for subsequent experiments. Traditionally, neuronal recordings and network models have been related using single-neuron and pairwise spike train statistics. We review here recent studies that have begun to relate neuronal recordings and network models based on the multi-dimensional structure of neuronal population activity, as identified using dimensionality reduction. This approach has been used to study working memory, decision making, motor control, and more. Dimensionality reduction has provided common ground for incisive comparisons and tight interplay between neuronal recordings and network models.
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Affiliation(s)
- Ryan C Williamson
- Center for the Neural Basis of Cognition, Pittsburgh, PA, USA; Department of Machine Learning, Carnegie Mellon University, Pittsburgh, PA, USA; School of Medicine, University of Pittsburgh, Pittsburgh, PA, USA
| | - Brent Doiron
- Center for the Neural Basis of Cognition, Pittsburgh, PA, USA; Department of Mathematics, University of Pittsburgh, Pittsburgh, PA, USA
| | - Matthew A Smith
- Center for the Neural Basis of Cognition, Pittsburgh, PA, USA; Department of Ophthalmology, University of Pittsburgh, Pittsburgh, PA, USA; Department of Bioengineering, University of Pittsburgh, Pittsburgh, PA, USA
| | - Byron M Yu
- Center for the Neural Basis of Cognition, Pittsburgh, PA, USA; Department of Electrical Engineering, Carnegie Mellon University, Pittsburgh, PA, USA; Department of Biomedical Engineering, Carnegie Mellon University, Pittsburgh, PA, USA.
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Snyder AC, Yu BM, Smith MA. Distinct population codes for attention in the absence and presence of visual stimulation. Nat Commun 2018; 9:4382. [PMID: 30348942 PMCID: PMC6197235 DOI: 10.1038/s41467-018-06754-5] [Citation(s) in RCA: 25] [Impact Index Per Article: 4.2] [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: 03/20/2018] [Accepted: 09/12/2018] [Indexed: 12/02/2022] Open
Abstract
Visual neurons respond more vigorously to an attended stimulus than an unattended one. How the brain prepares for response gain in anticipation of that stimulus is not well understood. One prominent proposal is that anticipation is characterized by gain-like modulations of spontaneous activity similar to gains in stimulus responses. Here we test an alternative idea: anticipation is characterized by a mixture of both increases and decreases of spontaneous firing rates. Such a strategy would be adaptive as it supports a simple linear scheme for disentangling internal, modulatory signals from external, sensory inputs. We recorded populations of V4 neurons in monkeys performing an attention task, and found that attention states are signaled by different mixtures of neurons across the population in the presence or absence of a stimulus. Our findings support a move from a stimulation-invariant account of anticipation towards a richer view of attentional modulation in a diverse neuronal population. Attention affects stimulus response gain, but its impact without sensory drive is less known. Here, the authors show that attention is coded diversely in a population and is distinct between unstimulated and stimulated contexts, providing a contrast to normalized gain models of attention.
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Affiliation(s)
- Adam C Snyder
- Department of Electrical and Computer Engineering, Carnegie Mellon University, Pittsburgh, 15289, PA, USA.,Department of Ophthalmology, University of Pittsburgh, Pittsburgh, 15213, PA, USA.,Center for the Neural Basis of Cognition, Carnegie Mellon University and University of Pittsburgh, Pittsburgh, 15260, PA, USA
| | - Byron M Yu
- Department of Electrical and Computer Engineering, Carnegie Mellon University, Pittsburgh, 15289, PA, USA.,Center for the Neural Basis of Cognition, Carnegie Mellon University and University of Pittsburgh, Pittsburgh, 15260, PA, USA.,Department of Biomedical Engineering, Carnegie Mellon University, Pittsburgh, 15289, PA, USA
| | - Matthew A Smith
- Department of Ophthalmology, University of Pittsburgh, Pittsburgh, 15213, PA, USA. .,Center for the Neural Basis of Cognition, Carnegie Mellon University and University of Pittsburgh, Pittsburgh, 15260, PA, USA. .,Department of Bioengineering, University of Pittsburgh, Pittsburgh, 15213, PA, USA.
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48
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Angelopoulos NV, Harvey JP, Bolland JD, Nunn AD, Noble RAA, Smith MA, Taylor MJ, Masters JEG, Moxon J, Cowx IG. Overcoming the dichotomy of implementing societal flood risk management while conserving instream fish habitat - A long-term study from a highly modified urban river. J Environ Manage 2018; 224:69-76. [PMID: 30031920 DOI: 10.1016/j.jenvman.2018.07.030] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/18/2018] [Revised: 07/10/2018] [Accepted: 07/10/2018] [Indexed: 06/08/2023]
Abstract
Flood Risk Management (FRM) is often essential to reduce the risk of flooding to properties and infrastructure in urban landscapes, but typically degrades the habitats required by many aquatic animals for foraging, refuge and reproduction. This conflict between flood risk management and biodiversity is driven by conflicting directives, such as the EU Floods and Water Framework Directives, and has led to a requirement for synergistic solutions for FRM that integrate river restoration actions. Unfortunately, ecological monitoring and appraisal of combined FRM and river restoration works is inadequate. This paper uses a case study from the River Don in Northern England to evaluate the effects of the FRM and subsequent river restoration works on instream habitat and the associated fish assemblage over an 8-year period. Flood risk management created a homogeneous channel but did not negatively affect fish species composition or densities, specifically brown trout. Densities of adult brown trout were comparable pre and post-FRM, while densities of juvenile bullhead and brown trout increased dramatically post FRM. River restoration works created a heterogeneous channel but did not significantly improve species composition or brown trout density. Species composition post-river restoration works returned to that similar to pre-FRM over a short-term period, but with improved numbers of juvenile bullhead. Although habitat complexity increased after river restoration works, long-term changes in species composition and densities were marginal, probably because the river reset habitat complexity within the time framework of the study.
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Affiliation(s)
- N V Angelopoulos
- Hull International Fisheries Institute, School of Environmental Sciences, University of Hull, Hull HU6 7RX, UK.
| | - J P Harvey
- Hull International Fisheries Institute, School of Environmental Sciences, University of Hull, Hull HU6 7RX, UK
| | - J D Bolland
- Hull International Fisheries Institute, School of Environmental Sciences, University of Hull, Hull HU6 7RX, UK
| | - A D Nunn
- Hull International Fisheries Institute, School of Environmental Sciences, University of Hull, Hull HU6 7RX, UK
| | - R A A Noble
- Hull International Fisheries Institute, School of Environmental Sciences, University of Hull, Hull HU6 7RX, UK
| | - M A Smith
- Hull International Fisheries Institute, School of Environmental Sciences, University of Hull, Hull HU6 7RX, UK
| | - M J Taylor
- Hull International Fisheries Institute, School of Environmental Sciences, University of Hull, Hull HU6 7RX, UK
| | - J E G Masters
- Environment Agency, Fisheries, Biodiversity and Geomorphology, Yorkshire Area. Lateral, 8 City Walk. Leeds LS11 9AT, UK
| | - J Moxon
- Environment Agency, Fisheries, Biodiversity and Geomorphology, Yorkshire Area. Lateral, 8 City Walk. Leeds LS11 9AT, UK
| | - I G Cowx
- Hull International Fisheries Institute, School of Environmental Sciences, University of Hull, Hull HU6 7RX, UK
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Snyder AC, Issar D, Smith MA. What does scalp electroencephalogram coherence tell us about long-range cortical networks? Eur J Neurosci 2018; 48:2466-2481. [PMID: 29363843 PMCID: PMC6497452 DOI: 10.1111/ejn.13840] [Citation(s) in RCA: 16] [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: 07/14/2017] [Revised: 12/20/2017] [Accepted: 01/17/2018] [Indexed: 01/01/2023]
Abstract
Long-range interactions between cortical areas are undoubtedly a key to the computational power of the brain. For healthy human subjects, the premier method for measuring brain activity on fast timescales is electroencephalography (EEG), and coherence between EEG signals is often used to assay functional connectivity between different brain regions. However, the nature of the underlying brain activity that is reflected in EEG coherence is currently the realm of speculation, because seldom have EEG signals been recorded simultaneously with intracranial recordings near cell bodies in multiple brain areas. Here, we take the early steps towards narrowing this gap in our understanding of EEG coherence by measuring local field potentials with microelectrode arrays in two brain areas (extrastriate visual area V4 and dorsolateral prefrontal cortex) simultaneously with EEG at the nearby scalp in rhesus macaque monkeys. Although we found inter-area coherence at both scales of measurement, we did not find that scalp-level coherence was reliably related to coherence between brain areas measured intracranially on a trial-to-trial basis, despite that scalp-level EEG was related to other important features of neural oscillations, such as trial-to-trial variability in overall amplitudes. This suggests that caution must be exercised when interpreting EEG coherence effects, and new theories devised about what aspects of neural activity long-range coherence in the EEG reflects.
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Affiliation(s)
- Adam C. Snyder
- Dept. of Electrical and Computer Engineering, Carnegie Mellon Univ., Pittsburgh, PA, USA,Dept. of Ophthalmology, Univ. of Pittsburgh, Pittsburgh, PA, USA,Center for the Neural Basis of Cognition, Univ. of Pittsburgh, Pittsburgh, PA, USA
| | - Deepa Issar
- Dept. of Bioengineering, Univ. of Pittsburgh, Pittsburgh, PA, USA
| | - Matthew A. Smith
- Dept. of Ophthalmology, Univ. of Pittsburgh, Pittsburgh, PA, USA,Center for the Neural Basis of Cognition, Univ. of Pittsburgh, Pittsburgh, PA, USA,Dept. of Bioengineering, Univ. of Pittsburgh, Pittsburgh, PA, USA,Fox Center for Vision Restoration, Univ. of Pittsburgh, Pittsburgh, PA, USA,Address correspondence to: Matthew A. Smith, Department of Ophthalmology, University of Pittsburgh, Eye and Ear Institute, 203 Lothrop St., 9 Fl., Pittsburgh, PA, 15213, Tel: (412) 647-2313,
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50
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Smith MA, Plyler ES, Dengler-Crish CM, Meier J, Crish SD. Nodes of Ranvier in Glaucoma. Neuroscience 2018; 390:104-118. [PMID: 30149050 DOI: 10.1016/j.neuroscience.2018.08.016] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/28/2018] [Revised: 08/15/2018] [Accepted: 08/17/2018] [Indexed: 01/13/2023]
Abstract
Retinal ganglion cell axons of the DBA/2J mouse model of glaucoma, a model characterized by extensive neuroinflammation, preserve synaptic contacts with their subcortical targets for a time after onset of anterograde axonal transport deficits, axon terminal hypertrophy, and cytoskeletal alterations. Though retrograde axonal transport is still evident in these axons, it is unknown if they retain their ability to transmit visual information to the brain. Using a combination of in vivo multiunit electrophysiology, neuronal tract tracing, multichannel immunofluorescence, and transmission electron microscopy, we report that eye-brain signaling deficits precede transport loss and axonal degeneration in the DBA/2J retinal projection. These deficits are accompanied by node of Ranvier pathology - consisting of increased node length and redistribution of the voltage-gated sodium channel Nav1.6 that parallel changes seen early in multiple sclerosis (MS) axonopathy. Further, with age, axon caliber and neurofilament density increase without corresponding changes in myelin thickness. In contrast to these findings in DBA/2J mice, node pathologies were not observed in the induced microbead occlusion model of glaucoma - a model that lacks pre-existing inflammation. After one week of systemic treatment with fingolimod, an immunosuppressant therapy for relapsing-remitting MS, DBA/2J mice showed a substantial reduction in node pathology and mild effects on axon morphology. These data suggest that neurophysiological deficits in the DBA/2J may be due to defects in intact axons and targeting node pathology may be a promising intervention for some types of glaucoma.
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Affiliation(s)
- M A Smith
- Northeast Ohio Medical University, Rootstown, OH 44272, United States
| | - E S Plyler
- Northeast Ohio Medical University, Rootstown, OH 44272, United States; Kent State Biomedical Sciences Graduate Program, United States
| | - C M Dengler-Crish
- Northeast Ohio Medical University, Rootstown, OH 44272, United States
| | - J Meier
- Northeast Ohio Medical University, Rootstown, OH 44272, United States
| | - S D Crish
- Northeast Ohio Medical University, Rootstown, OH 44272, United States.
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