1
|
Wang X, Xie Z, Lin R, Shu C, Lv S, Guo P, Xu H, Zhang J, Dong L, Gong X. Saliency enhancement method for photoacoustic molecular imaging based on Grüneisen relaxation nonlinear effect. JOURNAL OF BIOPHOTONICS 2024; 17:e202400004. [PMID: 38531622 DOI: 10.1002/jbio.202400004] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/07/2024] [Revised: 02/27/2024] [Accepted: 03/17/2024] [Indexed: 03/28/2024]
Abstract
Photoacoustic molecular imaging technology has a wide range of applications in biomedical research. In practical scenarios, both the probes and blood generate signals, resulting in the saliency of the probes in the blood environment being diminished, impacting imaging quality. Although several methods have been proposed for saliency enhancement, they inevitably suffer from moderate generality and detection speed. The Grüneisen relaxation (GR) nonlinear effect offers an alternative for enhancing saliency and can improve generality and speed. In this article, the excitation and detection efficiencies are optimized to enhance the GR signal amplitude. Experimental studies show that the saliency of the probe is enhanced. Moreover, the issue of signal aliasing is studied to ensure the accuracy of enhancement results in the tissues. In a word, the feasibility of the GR-based imaging method in saliency enhancement is successfully demonstrated in the study, showing the superiorities of good generality and detection speed.
Collapse
Affiliation(s)
- Xiatian Wang
- Beijing Key Laboratory for Precision Optoelectronic Measurement Instrument and Technology, School of Optics and Photonics, Beijing Institute of Technology, Beijing, China
- Research Center for Biomedical Optics and Molecular Imaging, Key Laboratory of Biomedical Imaging Science and System, Shenzhen Institute of Advanced Technology, Chinese Academy of Science, Shenzhen, China
- Shenzhen Key Laboratory for Molecular Imaging, Guangdong Provincial Key Laboratory of Biomedical Optical Imaging Technology, Shenzhen Institute of Advanced Technology, Chinese Academy of Science, Shenzhen, China
| | - Zhihua Xie
- Research Center for Biomedical Optics and Molecular Imaging, Key Laboratory of Biomedical Imaging Science and System, Shenzhen Institute of Advanced Technology, Chinese Academy of Science, Shenzhen, China
- Shenzhen Key Laboratory for Molecular Imaging, Guangdong Provincial Key Laboratory of Biomedical Optical Imaging Technology, Shenzhen Institute of Advanced Technology, Chinese Academy of Science, Shenzhen, China
| | - Riqiang Lin
- Research Center for Biomedical Optics and Molecular Imaging, Key Laboratory of Biomedical Imaging Science and System, Shenzhen Institute of Advanced Technology, Chinese Academy of Science, Shenzhen, China
- Shenzhen Key Laboratory for Molecular Imaging, Guangdong Provincial Key Laboratory of Biomedical Optical Imaging Technology, Shenzhen Institute of Advanced Technology, Chinese Academy of Science, Shenzhen, China
| | - Chengyou Shu
- Research Center for Biomedical Optics and Molecular Imaging, Key Laboratory of Biomedical Imaging Science and System, Shenzhen Institute of Advanced Technology, Chinese Academy of Science, Shenzhen, China
- Shenzhen Key Laboratory for Molecular Imaging, Guangdong Provincial Key Laboratory of Biomedical Optical Imaging Technology, Shenzhen Institute of Advanced Technology, Chinese Academy of Science, Shenzhen, China
| | - Shengmiao Lv
- Research Center for Biomedical Optics and Molecular Imaging, Key Laboratory of Biomedical Imaging Science and System, Shenzhen Institute of Advanced Technology, Chinese Academy of Science, Shenzhen, China
- Shenzhen Key Laboratory for Molecular Imaging, Guangdong Provincial Key Laboratory of Biomedical Optical Imaging Technology, Shenzhen Institute of Advanced Technology, Chinese Academy of Science, Shenzhen, China
| | - Pengkun Guo
- Research Center for Biomedical Optics and Molecular Imaging, Key Laboratory of Biomedical Imaging Science and System, Shenzhen Institute of Advanced Technology, Chinese Academy of Science, Shenzhen, China
- Shenzhen Key Laboratory for Molecular Imaging, Guangdong Provincial Key Laboratory of Biomedical Optical Imaging Technology, Shenzhen Institute of Advanced Technology, Chinese Academy of Science, Shenzhen, China
| | - Haoxing Xu
- Research Center for Biomedical Optics and Molecular Imaging, Key Laboratory of Biomedical Imaging Science and System, Shenzhen Institute of Advanced Technology, Chinese Academy of Science, Shenzhen, China
- Shenzhen Key Laboratory for Molecular Imaging, Guangdong Provincial Key Laboratory of Biomedical Optical Imaging Technology, Shenzhen Institute of Advanced Technology, Chinese Academy of Science, Shenzhen, China
| | - Jinke Zhang
- Research Center for Biomedical Optics and Molecular Imaging, Key Laboratory of Biomedical Imaging Science and System, Shenzhen Institute of Advanced Technology, Chinese Academy of Science, Shenzhen, China
- Shenzhen Key Laboratory for Molecular Imaging, Guangdong Provincial Key Laboratory of Biomedical Optical Imaging Technology, Shenzhen Institute of Advanced Technology, Chinese Academy of Science, Shenzhen, China
| | - Liquan Dong
- Beijing Key Laboratory for Precision Optoelectronic Measurement Instrument and Technology, School of Optics and Photonics, Beijing Institute of Technology, Beijing, China
- Yangtze Delta Region Academy of Beijing Institute of Technology, Jiaxing, China
| | - Xiaojing Gong
- Research Center for Biomedical Optics and Molecular Imaging, Key Laboratory of Biomedical Imaging Science and System, Shenzhen Institute of Advanced Technology, Chinese Academy of Science, Shenzhen, China
- Shenzhen Key Laboratory for Molecular Imaging, Guangdong Provincial Key Laboratory of Biomedical Optical Imaging Technology, Shenzhen Institute of Advanced Technology, Chinese Academy of Science, Shenzhen, China
| |
Collapse
|
2
|
Du Z, Luong HM, Sabury S, Jones AL, Zhu Z, Panoy P, Chae S, Yi A, Kim HJ, Xiao S, Brus VV, Manjunatha Reddy GN, Reynolds JR, Nguyen TQ. High-Performance Wearable Organic Photodetectors by Molecular Design and Green Solvent Processing for Pulse Oximetry and Photoplethysmography. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2024; 36:e2310478. [PMID: 38054854 DOI: 10.1002/adma.202310478] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/09/2023] [Revised: 11/27/2023] [Indexed: 12/07/2023]
Abstract
White-light detection from the visible to the near-infrared region is central to many applications such as high-speed cameras, autonomous vehicles, and wearable electronics. While organic photodetectors (OPDs) are being developed for such applications, several challenges must be overcome to produce scalable high-detectivity OPDs. This includes issues associated with low responsivity, narrow absorption range, and environmentally friendly device fabrication. Here, an OPD system processed from 2-methyltetrahydrofuran (2-MeTHF) sets a record in light detectivity, which is also comparable with commercially available silicon-based photodiodes is reported. The newly designed OPD is employed in wearable devices to monitor heart rate and blood oxygen saturation using a flexible OPD-based finger pulse oximeter. In achieving this, a framework for a detailed understanding of the structure-processing-property relationship in these OPDs is also developed. The bulk heterojunction (BHJ) thin films processed from 2-MeTHF are characterized at different length scales with advanced techniques. The BHJ morphology exhibits optimal intermixing and phase separation of donor and acceptor moieties, which facilitates the charge generation and collection process. Benefitting from high charge carrier mobilities and a low shunt leakage current, the newly developed OPD exhibits a specific detectivity of above 1012 Jones over 400-900 nm, which is higher than those of reference devices processed from chlorobenzene and ortho-xylene.
Collapse
Affiliation(s)
- Zhifang Du
- Center for Polymers and Organic Solids, Department of Chemistry and Biochemistry, University of California at Santa Barbara, Santa Barbara, CA, 93106, USA
| | - Hoang Mai Luong
- Center for Polymers and Organic Solids, Department of Chemistry and Biochemistry, University of California at Santa Barbara, Santa Barbara, CA, 93106, USA
| | - Sina Sabury
- School of Chemistry and Biochemistry, School of Materials Science and Engineering, Center for Organic Photonics and Electronics, Georgia Tech Polymer Network, Georgia Institute of Technology, Atlanta, GA, 30332, USA
| | - Austin L Jones
- School of Chemistry and Biochemistry, School of Materials Science and Engineering, Center for Organic Photonics and Electronics, Georgia Tech Polymer Network, Georgia Institute of Technology, Atlanta, GA, 30332, USA
| | - Ziyue Zhu
- Center for Polymers and Organic Solids, Department of Chemistry and Biochemistry, University of California at Santa Barbara, Santa Barbara, CA, 93106, USA
| | - Patchareepond Panoy
- Center for Polymers and Organic Solids, Department of Chemistry and Biochemistry, University of California at Santa Barbara, Santa Barbara, CA, 93106, USA
| | - Sangmin Chae
- Center for Polymers and Organic Solids, Department of Chemistry and Biochemistry, University of California at Santa Barbara, Santa Barbara, CA, 93106, USA
| | - Ahra Yi
- Department of Organic Materials Science and Engineering, School of Chemical Engineering, Pusan National University, Busan, 46241, Republic of Korea
| | - Hyo Jung Kim
- Department of Organic Materials Science and Engineering, School of Chemical Engineering, Pusan National University, Busan, 46241, Republic of Korea
| | - Steven Xiao
- 1-Material Inc, 2290 Chemin St-Francois, Dorval, Quebec, H9P 1K2, Canada
| | - Viktor V Brus
- Department of Physics, School of Sciences and Humanities, Nazarbayev University, Nur-Sultan City, 010000, Republic of Kazakhstan
| | - G N Manjunatha Reddy
- University of Lille, CNRS, Centrale Lille Institut, Univ. Artois, UMR 8181, Unité de Catalyse et Chimie du Solide, Lille, F-59000, France
| | - John R Reynolds
- School of Chemistry and Biochemistry, School of Materials Science and Engineering, Center for Organic Photonics and Electronics, Georgia Tech Polymer Network, Georgia Institute of Technology, Atlanta, GA, 30332, USA
| | - Thuc-Quyen Nguyen
- Center for Polymers and Organic Solids, Department of Chemistry and Biochemistry, University of California at Santa Barbara, Santa Barbara, CA, 93106, USA
| |
Collapse
|
3
|
Ghosh Moulick R, Juneja S, Gupta J, Rana V, Bhattacharya J. Formation of Self-Assembled Nanowires from Copper Nanoparticles Synthesized by the Electro-Explosion of Wires Technique-Study of the Time-Dependent Structural and Functional Evolution. ACS OMEGA 2023; 8:46481-46489. [PMID: 38107910 PMCID: PMC10719912 DOI: 10.1021/acsomega.3c04675] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 06/30/2023] [Revised: 11/10/2023] [Accepted: 11/13/2023] [Indexed: 12/19/2023]
Abstract
We report here the formation of Cu nanowires (CuNWs) from Cu nanoparticles (CuNPs) by a self-assembly process. The CuNPs were synthesized by the electro-explosion of wire (EEW) technique that included nonequilibrium processes for the synthesis. Structural evolution in terms of aggregation or nanowire formation in the samples was observed when the CuNPs were kept for a month after synthesis in a glass vial without the application of any external driving force. The emergence of tangled CuNWs was noticed at the bottom of the vials only when no agitation or aeration was allowed. The nanowires were characterized using transmission electron microscopy (TEM) and X-ray diffraction (XRD). Thermal oxidation of the nanowire samples implied that they could convert into rod-shaped structures. Loss of functionality was also observed in the hemoglobin precipitation study conducted to compare the activity of freshly prepared CuNPs and CuNWs. From the above observations, we conclude that the CuNP, after synthesis, possesses a huge amount of energy, and attainment of equilibrium occurs through either aggregation (clustering) or ordered self-assembly, depending on the conditions applied.
Collapse
Affiliation(s)
- Ranjita Ghosh Moulick
- Amity
Institute of Biotechnology/Amity Institute of Integrative Sciences
and Health, Amity University Haryana, Gurugram 122413, Haryana, India
| | - Subhavna Juneja
- School
of Biotechnology, Jawaharlal Nehru University, New Delhi 110067, India
| | - Jagriti Gupta
- School
of Environmental Sciences, Jawaharlal Nehru
University, New Delhi 110067, India
| | - Vaishali Rana
- Amity
Institute of Biotechnology/Amity Institute of Integrative Sciences
and Health, Amity University Haryana, Gurugram 122413, Haryana, India
| | | |
Collapse
|
4
|
Gokhale SG, Daggubati VS, Alexandrakis G. Developing a novel device based on a new technology for non-invasive measurement of blood biomarkers irrespective of skin color. GERMAN MEDICAL SCIENCE : GMS E-JOURNAL 2023; 21:Doc09. [PMID: 37426887 PMCID: PMC10326528 DOI: 10.3205/000323] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Figures] [Subscribe] [Scholar Register] [Received: 03/14/2022] [Indexed: 07/11/2023]
Abstract
Background Human hemoglobin is a tetrameric metalloporphyrin. The heme part contains iron radicle and porphyrin. The globin part consists of two pairs of amino-acid chains. The absorption spectrum of hemoglobin spans from 250 nm to as high as 2,500 nm, with high coefficients reported in blue and green color zone. The visible absorption spectrum of deoxyhemoglobin has one, while the visible absorption spectrum of oxyhemoglobin shows two peaks. Objective (1) To study absorption spectrometry of hemoglobin in 420 to 600 nm range; (2) to conduct preclinical experiments to validate a new device and technology based on green color absorption by hemoglobin; (3) to use this new technology and device for phase 1 study in healthy human volunteers for confirmation. Design material and methods (1) Checking absorption spectrometry of hemoglobin in venous blood. We measured absorption spectrometry of 25 mother-baby pairs as an observational study. Readings were plotted from 400 nm to 560 nm. These included peaks, flat lines and deeps. Graph tracings of all samples - cord blood and maternal blood - showed similar patterns. (2) Preclinical experiments were set up (a) to correlate the reflection of green light by hemoglobin and concentration of hemoglobin, (b) to correlate concentration of O2 and reflection of green light related to oxyhemoglobin, (c) to correlate concentration of melanin in upper and the hemoglobin in lower layer of tissue phantom and to check the sensitivity of new device with green light for measuring Hb in presence of high levels of melanin, and lastly (d) to check if the new device can measure changes in oxy-hemoglobin and deoxy-hemoglobin, again in presence of high levels of melanin with normal as well as with low levels of hemoglobin. The experiments using bilayer tissue phantom were conducted with horse blood in lower cup as dermal tissue phantom and synthetic melanin in upper layer as epidermal tissue phantom. (3) Phase 1 observational studies following a protocol approved by the institutional review board (IRB) were done in two cohorts. Readings were taken using our device and a commercially available pulse oximeter. In the comparison arm we had Point of Care (POC) Hb test (HemoCu or iSTAT blood test). We had 127 data points of POC Hb test and 170 data points for our device and pulse oximeters. This device uses two wavelengths from the visible spectrum of light and uses reflected light. Light of specific wavelengths is shone on the skin of the individual, and the reflected light is collected as 'optical signal'. This optical signal - after conversion to electrical signal - is processed and finally analysed with a digital display on the screen. Melanin is accounted using Von Luschan's chromatic scale (VLS) and a specially designed algorithm. Results In this set of various preclinical experiments using different concentrations of hemoglobin and melanin, we indeed demonstrated good sensitivity of our device. It could pick up signals from hemoglobin despite high levels of melanin. Our device is a non-invasive device to measure hemoglobin like a pulse oximeter. Results of our device and pulse oximeter were compared with those by POC Hb test like HemoCu and iSTAT. Our device showed better trending linearity and concordance than a pulse oximeter. Since the absorption spectrum of hemoglobin is the same is new-borns and adults, we could develop one device for all age groups and for people of all colors. Furthermore, the light is shone on the wrist of the individual and is then measured. So, in future this device has the potential of being incorporated in a wearable or smart watch technology.
Collapse
Affiliation(s)
- Sanjay G. Gokhale
- Department of Bioengineering, University of Texas at Arlington, Texas, USA
| | | | | |
Collapse
|
5
|
Abstract
Over the last half century, the autofluorescence of the metabolic cofactors NADH (reduced nicotinamide adenine dinucleotide) and FAD (flavin adenine dinucleotide) has been quantified in a variety of cell types and disease states. With the spread of nonlinear optical microscopy techniques in biomedical research, NADH and FAD imaging has offered an attractive solution to noninvasively monitor cell and tissue status and elucidate dynamic changes in cell or tissue metabolism. Various tools and methods to measure the temporal, spectral, and spatial properties of NADH and FAD autofluorescence have been developed. Specifically, an optical redox ratio of cofactor fluorescence intensities and NADH fluorescence lifetime parameters have been used in numerous applications, but significant work remains to mature this technology for understanding dynamic changes in metabolism. This article describes the current understanding of our optical sensitivity to different metabolic pathways and highlights current challenges in the field. Recent progress in addressing these challenges and acquiring more quantitative information in faster and more metabolically relevant formats is also discussed.
Collapse
Affiliation(s)
- Irene Georgakoudi
- Department of Biomedical Engineering, Tufts University, Medford, Massachusetts, USA;
- Genetics, Molecular and Cellular Biology Program, Graduate School of Biomedical Sciences, Tufts University, Boston, Massachusetts, USA
| | - Kyle P Quinn
- Department of Biomedical Engineering and the Arkansas Integrative Metabolic Research Center, University of Arkansas, Fayetteville, Arkansas, USA
| |
Collapse
|
6
|
Canpolat G. Molecularly imprinted polymer-based microspheres for selective extraction of hemoglobin from blood serum. Process Biochem 2023. [DOI: 10.1016/j.procbio.2023.03.017] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 03/17/2023]
|
7
|
Afonso E, Bayat F, Ladouceur L, Khan S, Martínez-Gómez A, Weitz JI, Hosseinidoust Z, Tiemblo P, García N, Didar TF. Highly Stable Hierarchically Structured All-Polymeric Lubricant-Infused Films Prevent Thrombosis and Repel Multidrug-Resistant Pathogens. ACS APPLIED MATERIALS & INTERFACES 2022; 14:53535-53545. [PMID: 36413608 DOI: 10.1021/acsami.2c17309] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/16/2023]
Abstract
Thrombus formation and infections caused by bacterial adhesion are the most common causes of failure in blood-contacting medical devices. Reducing the interaction of pathogens using repellent surfaces has proven to be a successful strategy in preventing device failure. However, designing scale-up methodologies to create large-scale repellent surfaces remains challenging. To address this need, we have created an all-polymeric lubricant-infused system using an industrially viable swelling-coagulation solvent (S-C) method. This induces hierarchically structured micro/nano features onto the surface, enabling improved lubricant infusion. Poly(3,3,3-trifluoropropylmethylsiloxane) (PTFS) was used as the lubricant of choice, a previously unexplored omniphobic nonvolatile silicone oil. This resulted in all-polymeric liquid-infused surfaces that are transparent and flexible with long-term stability. Repellent properties have been demonstrated using human whole blood and methicillin-resistant Staphylococcus aureus (MRSA) bacteria matrices, with lubricated surfaces showing 93% reduction in blood stains and 96.7% reduction in bacterial adherence. The developed material has the potential to prevent blood and pathogenic contamination for a range biomedical devices within healthcare settings.
Collapse
Affiliation(s)
- Elisabet Afonso
- Department of Physical Chemistry of Polymers, Institute of Polymer Science and Technology, Spanish Research Council, Madrid 28006, Spain
| | - Fereshteh Bayat
- School of Biomedical Engineering, McMaster University, Hamilton, Ontario L9S 8L7, Canada
| | - Liane Ladouceur
- Department of Mechanical Engineering, McMaster University, Hamilton, Ontario L8S 4L8, Canada
| | - Shadman Khan
- School of Biomedical Engineering, McMaster University, Hamilton, Ontario L9S 8L7, Canada
| | - Aránzazu Martínez-Gómez
- Department of Physical Chemistry of Polymers, Institute of Polymer Science and Technology, Spanish Research Council, Madrid 28006, Spain
| | - Jeffrey I Weitz
- School of Biomedical Engineering, McMaster University, Hamilton, Ontario L9S 8L7, Canada
- Department of Medicine, 1280 Main St W, McMaster University, Hamilton, Ontario L8S 4L8, Canada
- Department of Biochemistry and Biomedical Sciences, McMaster University, 1280 Main St W, Hamilton, Ontario L8S 4L8, Canada
- Thrombosis & Atherosclerosis Research Institute (TaARI), 237 Barton Street East, Hamilton, Ontario L8L 2X2, Canada
| | - Zeinab Hosseinidoust
- School of Biomedical Engineering, McMaster University, Hamilton, Ontario L9S 8L7, Canada
- Department of Chemical Engineering, McMaster University, Hamilton, Ontario L9S 8L7, Canada
- Michael DeGroote Institute for Infectious Disease Research, McMaster University, Hamilton, Ontario L98 4L8, Canada
| | - Pilar Tiemblo
- Department of Physical Chemistry of Polymers, Institute of Polymer Science and Technology, Spanish Research Council, Madrid 28006, Spain
| | - Nuria García
- Department of Physical Chemistry of Polymers, Institute of Polymer Science and Technology, Spanish Research Council, Madrid 28006, Spain
| | - Tohid F Didar
- School of Biomedical Engineering, McMaster University, Hamilton, Ontario L9S 8L7, Canada
- Department of Mechanical Engineering, McMaster University, Hamilton, Ontario L8S 4L8, Canada
- Michael DeGroote Institute for Infectious Disease Research, McMaster University, Hamilton, Ontario L98 4L8, Canada
| |
Collapse
|
8
|
Allahdadi E, Shirkavand A, Mohajerani E, Mansouri P, Almasi A, Sherafat SJ. Optimizing parameters of the Pulsed Dye Laser (PDL, 585-nm) for hemangioma treatment using diffuse reflectance spectroscopy. J Cosmet Dermatol 2022; 21:6798-6804. [PMID: 36181704 DOI: 10.1111/jocd.15430] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/11/2021] [Revised: 08/24/2022] [Accepted: 09/29/2022] [Indexed: 01/06/2023]
Abstract
INTRODUCTION The lack of objectivity options for a specific individualized therapy might cause challenges in laser treatment. In other words, we need optimally determined laser parameters for less side effects. Generally, laser treatment procedures seem to be subjective. Then, the final evaluation of the patient needs for optimized better response with less laser sections and less side effects. Therefore, employing a reliable objective technique seems to be essential for better response with less laser treatment sessions and also less side effects. METHOD In this research, UV-visible diffused reflection spectra from normal skin and a lesion were taken. We obtained the differences in absorption intensity at 575 nm, the wavelength corresponds to the absorption peak of blood oxyhemoglobin for normal skin and hemangioma. To calibrate the measurements, after using pulsed dye laser (PDL at 585 nm), the PDL treatment response of the patients were graded as "good (>50%), moderate(25%-50%), and poor (0%-25%)," by a specialist. Finally, patients were categorized based on the energy of the laser for the best treatment response to propose the recommended laser parameters. RESULTS Based on the differences in the absorption peak hemangioma compare with normal skin, the energy density of PDL for a good treatment response of hemangioma was obtained at peak wavelength 575 nm. CONCLUSION The analysis of optical reflection spectroscopy can assess the correlation of absorption peak differences of vascular lesions and normal skin. According to this data, it seems to be effective in optimizing lasers parameters for the hemangioma treatment.
Collapse
Affiliation(s)
- Ehsan Allahdadi
- Laser and Plasma Research Institute, Shahid Beheshti University, Tehran, Iran
| | - Afshan Shirkavand
- Medical Laser Department, Medical Laser Research Center (MLRC), YARA Institute, ACECR, Tehran, Iran
| | - Ezeddin Mohajerani
- Laser and Plasma Research Institute, Shahid Beheshti University, Tehran, Iran
| | - Parvin Mansouri
- Medical Laser Department, Medical Laser Research Center (MLRC), YARA Institute, ACECR, Tehran, Iran
| | - Ali Almasi
- Laser and Plasma Research Institute, Shahid Beheshti University, Tehran, Iran
| | - Somayeh Jahani Sherafat
- Laser Application in Medical Sciences Research Center, Shahid Beheshti University of medical sciences, Tehran, Iran
| |
Collapse
|
9
|
Kessler N, Viehmann SF, Krollmann C, Mai K, Kirschner KM, Luksch H, Kotagiri P, Böhner AM, Huugen D, de Oliveira Mann CC, Otten S, Weiss SA, Zillinger T, Dobrikova K, Jenne DE, Behrendt R, Ablasser A, Bartok E, Hartmann G, Hopfner KP, Lyons PA, Boor P, Rösen-Wolff A, Teichmann LL, Heeringa P, Kurts C, Garbi N. Monocyte-derived macrophages aggravate pulmonary vasculitis via cGAS/STING/IFN-mediated nucleic acid sensing. J Exp Med 2022; 219:213416. [PMID: 35997679 PMCID: PMC9402992 DOI: 10.1084/jem.20220759] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/02/2022] [Revised: 07/07/2022] [Accepted: 08/03/2022] [Indexed: 11/04/2022] Open
Abstract
Autoimmune vasculitis is a group of life-threatening diseases, whose underlying pathogenic mechanisms are incompletely understood, hampering development of targeted therapies. Here, we demonstrate that patients suffering from anti-neutrophil cytoplasmic antibodies (ANCA)-associated vasculitis (AAV) showed increased levels of cGAMP and enhanced IFN-I signature. To identify disease mechanisms and potential therapeutic targets, we developed a mouse model for pulmonary AAV that mimics severe disease in patients. Immunogenic DNA accumulated during disease onset, triggering cGAS/STING/IRF3-dependent IFN-I release that promoted endothelial damage, pulmonary hemorrhages, and lung dysfunction. Macrophage subsets played dichotomic roles in disease. While recruited monocyte-derived macrophages were major disease drivers by producing most IFN-β, resident alveolar macrophages contributed to tissue homeostasis by clearing red blood cells and limiting infiltration of IFN-β-producing macrophages. Moreover, pharmacological inhibition of STING, IFNAR-I, or its downstream JAK/STAT signaling reduced disease severity and accelerated recovery. Our study unveils the importance of STING/IFN-I axis in promoting pulmonary AAV progression and identifies cellular and molecular targets to ameliorate disease outcomes.
Collapse
Affiliation(s)
- Nina Kessler
- Institute of Molecular Medicine and Experimental Immunology, Medical Faculty, University of Bonn, Bonn, Germany,Nina Kessler:
| | - Susanne F. Viehmann
- Institute of Molecular Medicine and Experimental Immunology, Medical Faculty, University of Bonn, Bonn, Germany
| | - Calvin Krollmann
- Medical Clinic and Polyclinic III, University Hospital Bonn, Bonn, Germany
| | - Karola Mai
- Institute of Molecular Medicine and Experimental Immunology, Medical Faculty, University of Bonn, Bonn, Germany
| | - Katharina M. Kirschner
- Institute of Molecular Medicine and Experimental Immunology, Medical Faculty, University of Bonn, Bonn, Germany
| | - Hella Luksch
- Department of Pediatrics, Universitätsklinikum Carl Gustav Carus TU Dresden, Dresden, Germany
| | - Prasanti Kotagiri
- Department of Medicine, University of Cambridge School of Clinical Medicine, University of Cambridge, Cambridge, UK
| | - Alexander M.C. Böhner
- Institute of Molecular Medicine and Experimental Immunology, Medical Faculty, University of Bonn, Bonn, Germany,Department of Radiation Oncology, University Hospital Bonn, Bonn, Germany
| | - Dennis Huugen
- Department of Internal Medicine, Division of Clinical and Experimental Immunology, University of Maastricht, Maastricht, Netherlands
| | | | - Simon Otten
- Institute of Pathology, University Hospital Aachen, RWTH Aachen University, Aachen, Germany
| | - Stefanie A.I. Weiss
- Comprehensive Pneumology Center, Institute of Lung Biology and Disease, Helmholtz Zentrum München and University Hospital of the Ludwig-Maximilians University, Munich, Germany
| | - Thomas Zillinger
- Institute of Clinical Chemistry and Clinical Pharmacology, University Hospital Bonn, Bonn, Germany
| | - Kristiyana Dobrikova
- Institute of Molecular Medicine and Experimental Immunology, Medical Faculty, University of Bonn, Bonn, Germany
| | - Dieter E. Jenne
- Comprehensive Pneumology Center, Institute of Lung Biology and Disease, Helmholtz Zentrum München and University Hospital of the Ludwig-Maximilians University, Munich, Germany,Max Planck Institute of Neurobiology, Planegg-Martinsried, Planegg, Germany
| | - Rayk Behrendt
- Institute for Clinical Chemistry and Clinical Pharmacology, University Hospital Bonn, Bonn, Germany
| | - Andrea Ablasser
- Global Health Institute, Swiss Federal Institute of Technology, Lausanne, Switzerland
| | - Eva Bartok
- Institute of Clinical Chemistry and Clinical Pharmacology, University Hospital Bonn, Bonn, Germany
| | - Gunther Hartmann
- Institute of Clinical Chemistry and Clinical Pharmacology, University Hospital Bonn, Bonn, Germany
| | | | - Paul A. Lyons
- Department of Medicine, University of Cambridge School of Clinical Medicine, University of Cambridge, Cambridge, UK,Cambridge Institute for Therapeutic Immunology and Infectious Disease, Jeffrey Cheah Biomedical Centre, University of Cambridge, Cambridge, UK
| | - Peter Boor
- Institute of Pathology, University Hospital Aachen, RWTH Aachen University, Aachen, Germany
| | - Angela Rösen-Wolff
- Department of Pediatrics, Universitätsklinikum Carl Gustav Carus TU Dresden, Dresden, Germany
| | - Lino L. Teichmann
- Medical Clinic and Polyclinic III, University Hospital Bonn, Bonn, Germany
| | - Peter Heeringa
- Department of Pathology and Medical Biology, University Medical Center Groningen, University of Groningen, Groningen, Netherlands
| | - Christian Kurts
- Institute of Molecular Medicine and Experimental Immunology, Medical Faculty, University of Bonn, Bonn, Germany
| | - Natalio Garbi
- Institute of Molecular Medicine and Experimental Immunology, Medical Faculty, University of Bonn, Bonn, Germany,Correspondence to Natalio Garbi:
| |
Collapse
|
10
|
Taylor-Williams M, Spicer G, Bale G, Bohndiek SE. Noninvasive hemoglobin sensing and imaging: optical tools for disease diagnosis. JOURNAL OF BIOMEDICAL OPTICS 2022; 27:JBO-220074VR. [PMID: 35922891 PMCID: PMC9346606 DOI: 10.1117/1.jbo.27.8.080901] [Citation(s) in RCA: 7] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/06/2022] [Accepted: 06/27/2022] [Indexed: 05/08/2023]
Abstract
SIGNIFICANCE Measurement and imaging of hemoglobin oxygenation are used extensively in the detection and diagnosis of disease; however, the applied instruments vary widely in their depth of imaging, spatiotemporal resolution, sensitivity, accuracy, complexity, physical size, and cost. The wide variation in available instrumentation can make it challenging for end users to select the appropriate tools for their application and to understand the relative limitations of different methods. AIM We aim to provide a systematic overview of the field of hemoglobin imaging and sensing. APPROACH We reviewed the sensing and imaging methods used to analyze hemoglobin oxygenation, including pulse oximetry, spectral reflectance imaging, diffuse optical imaging, spectroscopic optical coherence tomography, photoacoustic imaging, and diffuse correlation spectroscopy. RESULTS We compared and contrasted the ability of different methods to determine hemoglobin biomarkers such as oxygenation while considering factors that influence their practical application. CONCLUSIONS We highlight key limitations in the current state-of-the-art and make suggestions for routes to advance the clinical use and interpretation of hemoglobin oxygenation information.
Collapse
Affiliation(s)
- Michaela Taylor-Williams
- University of Cambridge, Department of Physics, Cavendish Laboratory, Cambridge, United Kingdom, United Kingdom
- University of Cambridge, Cancer Research UK Cambridge Institute, Cambridge, United Kingdom, United Kingdom
| | - Graham Spicer
- University of Cambridge, Department of Physics, Cavendish Laboratory, Cambridge, United Kingdom, United Kingdom
- University of Cambridge, Cancer Research UK Cambridge Institute, Cambridge, United Kingdom, United Kingdom
| | - Gemma Bale
- University of Cambridge, Department of Physics, Cavendish Laboratory, Cambridge, United Kingdom, United Kingdom
- University of Cambridge, Electrical Division, Department of Engineering, Cambridge, United Kingdom, United Kingdom
| | - Sarah E Bohndiek
- University of Cambridge, Department of Physics, Cavendish Laboratory, Cambridge, United Kingdom, United Kingdom
- University of Cambridge, Cancer Research UK Cambridge Institute, Cambridge, United Kingdom, United Kingdom
| |
Collapse
|
11
|
Kendall WY, Bordas J, Mirminachi S, Joseph A, Roper J, Wax A. Spectroscopic optical coherence tomography for classification of colorectal cancer in a mouse model. JOURNAL OF BIOPHOTONICS 2022; 15:e202100387. [PMID: 35338763 DOI: 10.1002/jbio.202100387] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/16/2021] [Revised: 03/16/2022] [Accepted: 03/17/2022] [Indexed: 06/14/2023]
Abstract
Noninvasive diagnosis of the malignant potential of colon polyps can improve prevention of colorectal cancer without the need for time-consuming and expensive biopsies. This study examines the use of spectroscopic optical coherence tomography (OCT) to classify tissue from genetically engineered mouse models of early-stage adenoma (APC) and advanced adenocarcinoma (AKP) in which tumors are induced in the distal colon. The optical tissue properties of scattering power and scattering attenuation coefficient are evaluated by analyzing the imaging data collected from tissues. Classifications are generated using 2D linear discriminant analysis with high levels of discrimination obtained. The overall classification accuracy obtained was 91.5%, with 100% sensitivity and 96.7% specificity in separating tumors from benign tissue, and 77.8% sensitivity and 99.4% specificity in separating adenocarcinoma from nonmalignant tissue. Thus, this study demonstrates the clinical potential of using spectroscopic OCT for rapid detection of colon adenoma and colorectal cancer.
Collapse
Affiliation(s)
- Wesley Y Kendall
- Department of Biomedical Engineering, Duke University, Durham, North Carolina, USA
| | - Julianna Bordas
- Department of Biomedical Engineering, Duke University, Durham, North Carolina, USA
| | | | - Abel Joseph
- Department of Gastroenterology, Duke Medicine, Durham, North Carolina, USA
| | - Jatin Roper
- Department of Gastroenterology, Duke Medicine, Durham, North Carolina, USA
| | - Adam Wax
- Department of Biomedical Engineering, Duke University, Durham, North Carolina, USA
| |
Collapse
|
12
|
Storari M, Zerman N, Spinas E. Local Administration of ElectroMagnetic Field as Add-On Therapy in the Treatment of Chronic Facial Pain: A Pilot Study. INTERNATIONAL JOURNAL OF ENVIRONMENTAL RESEARCH AND PUBLIC HEALTH 2022; 19:ijerph19074123. [PMID: 35409806 PMCID: PMC8998600 DOI: 10.3390/ijerph19074123] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 02/01/2022] [Revised: 03/24/2022] [Accepted: 03/29/2022] [Indexed: 12/10/2022]
Abstract
Fibromyalgic syndrome and orofacial neuropathic pain are major public health concerns affecting up to 5% and 10%, respectively, of the general population. They generally require medications such as antidepressants and anticonvulsants, which may additionally impact the quality of life with their side effects. Modern technologies and related applications have changed several fields of human life, even in medicine. In the current study, the local administration of electromagnetic fields as add-on therapy for the treatment of cervical and facial pain in patients with fibromyalgia or neuropathic pain has been evaluated. A total of 15 patients were recruited, and an electromagnetic field was delivered through a small patch applied between C3 and C4. Patients were followed for 12 months, and pain levels were rated via the VAS scale; ∆% was calculated through the analysis of median VAS scale values at each time point. Mild-to-moderate improvements were found, especially after six months. Patients with fibromyalgic syndrome showed better response rates than those with orofacial neuropathic pain. Joint stiffness, masticatory fatigue, and sleep disturbances were also reduced. In conclusion, the local application of electromagnetic field appeared effective in treating fibromyalgic and neuropathic pain in the head and neck district, with broader improvements and no side effects.
Collapse
Affiliation(s)
- Marco Storari
- Department of Surgical Science, College of Dentistry, University of Cagliari, 09124 Cagliari, Italy;
| | - Nicoletta Zerman
- Department of Surgery, Dentistry, Pediatrics and Gynaecology, University of Verona, 37124 Verona, Italy;
| | - Enrico Spinas
- Department of Surgical Science, College of Dentistry, University of Cagliari, 09124 Cagliari, Italy;
- Correspondence: ; Tel.: +39-330412295
| |
Collapse
|
13
|
Chowdhury MM, Piao Z, Albaghdadi MS, Coughlin PA, Rudd JHF, Tearney GJ, Jaffer FA. Intravascular Fluorescence Molecular Imaging of Atherosclerosis. Methods Mol Biol 2022; 2419:853-872. [PMID: 35238006 PMCID: PMC9052094 DOI: 10.1007/978-1-0716-1924-7_52] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
Abstract
Optical molecular imaging using near-infrared fluorescence (NIRF) light is an emerging high-resolution imaging approach to image a wide range of molecular and cellular species in vivo. Imaging using NIR wavelengths (650-900 nm) enables deeper photon penetration into tissue and reduced tissue autofluorescence, resulting in higher sensitivity to detect exogenously administered NIR fluorophores (injectable molecular imaging agents). Greater imaging depth of several centimeters is further achievable in the NIR window as blood absorption is as an order of magnitude lower than in the visible range. Furthermore, as optical imaging is routinely performed in the cardiac catheterization laboratory (e.g., optical coherence tomography), intravascular NIRF offers a promising translational approach for clinical coronary and peripheral arterial imaging. To this point, the first human intravascular NIRF imaging study recently demonstrated the ability to detect NIR autofluorescence in patients with coronary atherosclerosis. This study provides a foundation for targeted intravascular NIRF molecular imaging studies in coronary patients. In this chapter, we detail system engineering, imaging agents and translational applications of intravascular NIRF molecular imaging.
Collapse
Affiliation(s)
- Mohammed M Chowdhury
- Cardiovascular Research Center, Division of Cardiology, Massachusetts General Hospital, Harvard Medical School, Boston, MA, USA
- Division of Vascular Surgery, Department of Surgery, Addenbrooke's Hospital, University of Cambridge, Cambridge, UK
| | - Zhonglie Piao
- Wellman Center for Photomedicine, Harvard Medical School and Massachusetts General Hospital, Boston, MA, USA
| | - Mazen S Albaghdadi
- Cardiovascular Research Center, Division of Cardiology, Massachusetts General Hospital, Harvard Medical School, Boston, MA, USA
| | - Patrick A Coughlin
- Division of Vascular Surgery, Department of Surgery, Addenbrooke's Hospital, University of Cambridge, Cambridge, UK
| | - James H F Rudd
- Division of Cardiovascular Medicine, Addenbrooke's Hospital, University of Cambridge, Cambridge, UK
| | - Guillermo J Tearney
- Wellman Center for Photomedicine, Harvard Medical School and Massachusetts General Hospital, Boston, MA, USA
- Department of Pathology, Harvard Medical School and Massachusetts General Hospital, Boston, MA, USA
| | - Farouc A Jaffer
- Cardiovascular Research Center, Division of Cardiology, Massachusetts General Hospital, Harvard Medical School, Boston, MA, USA.
- Wellman Center for Photomedicine, Harvard Medical School and Massachusetts General Hospital, Boston, MA, USA.
| |
Collapse
|
14
|
Wang K, Bian X, Zheng M, Liu P, Lin L, Tan X. Rapid determination of hemoglobin concentration by a novel ensemble extreme learning machine method combined with near-infrared spectroscopy. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2021; 263:120138. [PMID: 34304011 DOI: 10.1016/j.saa.2021.120138] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/11/2021] [Revised: 06/23/2021] [Accepted: 06/29/2021] [Indexed: 06/13/2023]
Abstract
A novel ensemble extreme learning machine (ELM) approach that combines Monte Carlo (MC) sampling and least absolute shrinkage and selection operator (LASSO), named as MC-LASSO-ELM, is proposed to determine hemoglobin concentration of blood. It employs MC sampling to randomly select samples from the training set and LASSO further to choose variables from selected samples to establish plenty of ELM sub-models. The final prediction is obtained by combining the predictions of these sub-models. Combined with near-infrared spectroscopy, MC-LASSO-ELM is used to determine the hemoglobin concentration of blood. Compared with ELM, MC-ELM and LASSO-ELM, MC-LASSO-ELM can obtain the best stability and highest accuracy.
Collapse
Affiliation(s)
- Kaiyi Wang
- State Key Laboratory of Separation Membranes and Membrane Processes, Tiangong University, Tianjin 300387, PR China; Tianjin Key Laboratory of Green Chemical Process Engineering, School of Chemical Engineering and Technology, Tiangong University, Tianjin 300387, PR China
| | - Xihui Bian
- State Key Laboratory of Separation Membranes and Membrane Processes, Tiangong University, Tianjin 300387, PR China; Tianjin Key Laboratory of Green Chemical Process Engineering, School of Chemical Engineering and Technology, Tiangong University, Tianjin 300387, PR China; Key Lab of Process Analysis and Control of Sichuan Universities, Yibin University, 644000, PR China.
| | - Meng Zheng
- Tianjin Key Laboratory of Green Chemical Process Engineering, School of Chemical Engineering and Technology, Tiangong University, Tianjin 300387, PR China
| | - Peng Liu
- State Key Laboratory of Separation Membranes and Membrane Processes, Tiangong University, Tianjin 300387, PR China; Tianjin Key Laboratory of Green Chemical Process Engineering, School of Chemical Engineering and Technology, Tiangong University, Tianjin 300387, PR China
| | - Ligang Lin
- State Key Laboratory of Separation Membranes and Membrane Processes, Tiangong University, Tianjin 300387, PR China
| | - Xiaoyao Tan
- State Key Laboratory of Separation Membranes and Membrane Processes, Tiangong University, Tianjin 300387, PR China; Tianjin Key Laboratory of Green Chemical Process Engineering, School of Chemical Engineering and Technology, Tiangong University, Tianjin 300387, PR China
| |
Collapse
|
15
|
Lin SE, Jheng DY, Hsu KY, Liu YR, Huang WH, Lee HC, Tsai CC. Rapid pseudo-H&E imaging using a fluorescence-inbuilt optical coherence microscopic imaging system. BIOMEDICAL OPTICS EXPRESS 2021; 12:5139-5158. [PMID: 34513247 PMCID: PMC8407814 DOI: 10.1364/boe.431586] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/17/2021] [Revised: 07/12/2021] [Accepted: 07/13/2021] [Indexed: 06/13/2023]
Abstract
A technique using Linnik-based optical coherence microscopy (OCM), with built-in fluorescence microscopy (FM), is demonstrated here to describe cellular-level morphology for fresh porcine and biobank tissue specimens. The proposed method utilizes color-coding to generate digital pseudo-H&E (p-H&E) images. Using the same camera, colocalized FM images are merged with corresponding morphological OCM images using a 24-bit RGB composition process to generate position-matched p-H&E images. From receipt of dissected fresh tissue piece to generation of stitched images, the total processing time is <15 min for a 1-cm2 specimen, which is on average two times faster than frozen-section H&E process for fatty or water-rich fresh tissue specimens. This technique was successfully used to scan human and animal fresh tissue pieces, demonstrating its applicability for both biobank and veterinary purposes. We provide an in-depth comparison between p-H&E and human frozen-section H&E images acquired from the same metastatic sentinel lymph node slice (∼10 µm thick), and show the differences, like elastic fibers of a tiny blood vessel and cytoplasm of tumor cells. This optical sectioning technique provides histopathologists with a convenient assessment method that outputs large-field H&E-like images of fresh tissue pieces without requiring any physical embedment.
Collapse
Affiliation(s)
- Sey-En Lin
- AcuSolutions Inc., 3F., No. 2, Ln. 263, Chongyang Rd., Nangang Dist., Taipei, Taiwan
- Department of Anatomic Pathology, New Taipei Municipal Tucheng Hospital (Built and operated by Chang Gung Medical Foundation), New Taipei City, Taiwan
| | - Dong-Yo Jheng
- AcuSolutions Inc., 3F., No. 2, Ln. 263, Chongyang Rd., Nangang Dist., Taipei, Taiwan
| | - Kuang-Yu Hsu
- AcuSolutions Inc., 3F., No. 2, Ln. 263, Chongyang Rd., Nangang Dist., Taipei, Taiwan
| | - Yun-Ru Liu
- Joint Biobank, Office of Human Research, Taipei Medical University, Taipei, Taiwan
| | - Wei-Hsiang Huang
- Graduate Institute of Molecular and Comparative Pathobiology, School of Veterinary Medicine, National Taiwan University, Taipei, Taiwan
| | - Hsiang-Chieh Lee
- Graduate Institute of Photonics and Optoelectronics, National Taiwan University, Taipei, Taiwan
- Department of Electrical Engineering, National Taiwan University, Taipei, Taiwan
| | - Chien-Chung Tsai
- AcuSolutions Inc., 3F., No. 2, Ln. 263, Chongyang Rd., Nangang Dist., Taipei, Taiwan
| |
Collapse
|
16
|
Moore C, Borum RM, Mantri Y, Xu M, Fajtová P, O’Donoghue AJ, Jokerst JV. Activatable Carbocyanine Dimers for Photoacoustic and Fluorescent Detection of Protease Activity. ACS Sens 2021; 6:2356-2365. [PMID: 34038103 DOI: 10.1021/acssensors.1c00518] [Citation(s) in RCA: 22] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
Activatable contrast agents are of ongoing research interest because they offer low background and high specificity to the imaging target. Engineered sensitivity to protease activity is particularly desirable because proteases are critical biomarkers in cancer, infectious disease, inflammatory disorders, and so forth. Herein, we developed and characterized a set of peptide-linked cyanine conjugates for dual-modal detection of protease activity via photoacoustic (PA) and fluorescence imaging. The peptide-dye conjugates were designed to undergo contact quenching via intramolecular dimerization and contained n dyes (n = 2, 3, or 4) with n - 1 cleavable peptide substrates. The absorption peaks of the conjugates were blue-shifted 50 nm relative to the free dye and had quenched fluorescence. This effect was sensitive to solvent polarity and could be reversed by solvent switching from water to dimethyl sulfoxide. Employing trypsin as a model protease, we observed a 2.5-fold recovery of the peak absorbance, 330-4600-fold fluorescent enhancement, and picomolar detection limits following proteolysis. The dimer probe was further characterized for PA activation. Proteolysis released single dye-peptide fragments that produced a 5-fold PA enhancement through the increased absorption at 680 nm with nanomolar sensitivity to trypsin. The peptide substrate could also be tuned for protease selectivity; as a proof-of-concept, we detected the main protease (Mpro) associated with the viral replication in SARS-CoV-2 infection. Last, the activated probe was imaged subcutaneously in mice and signal was linearly correlated to the cleaved probe. Overall, these results demonstrate a tunable scaffold for the PA molecular imaging of protease activity with potential value in areas such as disease monitoring, tumor imaging, intraoperative imaging, in vitro diagnostics, and point-of-care sensing.
Collapse
Affiliation(s)
- Colman Moore
- Department of Nanoengineering, University of California, San Diego, La Jolla, California 92093, United States
| | - Raina M. Borum
- Department of Nanoengineering, University of California, San Diego, La Jolla, California 92093, United States
| | - Yash Mantri
- Department of Bioengineering, University of California, San Diego, La Jolla, California 92093, United States
| | - Ming Xu
- Department of Nanoengineering, University of California, San Diego, La Jolla, California 92093, United States
| | - Pavla Fajtová
- Skaggs School of Pharmacy and Pharmaceutical Sciences, University of California, San Diego, La Jolla, California 92093, United States
| | - Anthony J. O’Donoghue
- Skaggs School of Pharmacy and Pharmaceutical Sciences, University of California, San Diego, La Jolla, California 92093, United States
| | - Jesse V. Jokerst
- Department of Nanoengineering, University of California, San Diego, La Jolla, California 92093, United States
- Materials Science and Engineering Program, University of California, San Diego, La Jolla, California 92093, United States
- Department of Radiology, University of California, San Diego, La Jolla, California 92093, United States
| |
Collapse
|
17
|
Xing F, Lee JH, Polucha C, Lee J. Design and optimization of line-field optical coherence tomography at visible wavebands. BIOMEDICAL OPTICS EXPRESS 2021; 12:1351-1365. [PMID: 33796358] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Subscribe] [Scholar Register] [Received: 10/26/2020] [Revised: 01/25/2021] [Accepted: 01/29/2021] [Indexed: 06/12/2023]
Abstract
Parallel line-field Fourier-domain optical coherence tomography (LF-FDOCT) has emerged to enable relatively higher speeds than the conventional FDOCT system. In the LF-FDOCT, one B-scan is captured at a time instead of scanning the beam to acquire hundreds of A-scans. On the other hand, spectroscopic OCT using the visible waveband provides absorption information over multiple wavelengths at each voxel. This information of spectral absorption enables quantitative measurement of blood oxygenation, voxel by voxel. Here, we presented the design and optimization of a LF-FDOCT system at the visible waveband (520-620 nm), especially using a generic Camera Link area sensor (2048 × 1088 pixels). To optimize the axial resolution and depth of imaging volume, we simulated various parameters and found that two Nyquist optima can exist, the origin and implication of which has been discussed. As a result, our system acquired 1088 A-scans in parallel at the camera's frame rate of 281 frame per second, achieving an equivalent rate of over 300,000 A-scan/s, while minimizing sacrifice in the point spread function (2.8 × 3.1 × 3.2 µm3, x × y × z) and the field of view (750 × 750 × 750 µm3). As an example of application, we presented high-speed imaging of blood oxygenation in the rodent brain cortex.
Collapse
Affiliation(s)
- Fangjian Xing
- School of Computer and Electronic information, Nanjing Normal University, Nanjing, 210023, China
- Center for Biomedical Engineering, School of Engineering, Brown University, Providence, Rhode Island 02912, USA
| | - Jang-Hoon Lee
- Center for Biomedical Engineering, School of Engineering, Brown University, Providence, Rhode Island 02912, USA
| | - Collin Polucha
- Center for Biomedical Engineering, School of Engineering, Brown University, Providence, Rhode Island 02912, USA
| | - Jonghwan Lee
- Center for Biomedical Engineering, School of Engineering, Brown University, Providence, Rhode Island 02912, USA
- Carney Institute for Brain Science, Brown University, Providence, Rhode Island 02912, USA
| |
Collapse
|
18
|
Xing F, Lee JH, Polucha C, Lee J. Design and optimization of line-field optical coherence tomography at visible wavebands. BIOMEDICAL OPTICS EXPRESS 2021; 12:1351-1365. [PMID: 33796358 PMCID: PMC7984778 DOI: 10.1364/boe.413424] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/26/2020] [Revised: 01/25/2021] [Accepted: 01/29/2021] [Indexed: 06/17/2023]
Abstract
Parallel line-field Fourier-domain optical coherence tomography (LF-FDOCT) has emerged to enable relatively higher speeds than the conventional FDOCT system. In the LF-FDOCT, one B-scan is captured at a time instead of scanning the beam to acquire hundreds of A-scans. On the other hand, spectroscopic OCT using the visible waveband provides absorption information over multiple wavelengths at each voxel. This information of spectral absorption enables quantitative measurement of blood oxygenation, voxel by voxel. Here, we presented the design and optimization of a LF-FDOCT system at the visible waveband (520-620 nm), especially using a generic Camera Link area sensor (2048 × 1088 pixels). To optimize the axial resolution and depth of imaging volume, we simulated various parameters and found that two Nyquist optima can exist, the origin and implication of which has been discussed. As a result, our system acquired 1088 A-scans in parallel at the camera's frame rate of 281 frame per second, achieving an equivalent rate of over 300,000 A-scan/s, while minimizing sacrifice in the point spread function (2.8 × 3.1 × 3.2 µm3, x × y × z) and the field of view (750 × 750 × 750 µm3). As an example of application, we presented high-speed imaging of blood oxygenation in the rodent brain cortex.
Collapse
Affiliation(s)
- Fangjian Xing
- School of Computer and Electronic information, Nanjing Normal University, Nanjing, 210023, China
- Center for Biomedical Engineering, School of Engineering, Brown University, Providence, Rhode Island 02912, USA
| | - Jang-Hoon Lee
- Center for Biomedical Engineering, School of Engineering, Brown University, Providence, Rhode Island 02912, USA
| | - Collin Polucha
- Center for Biomedical Engineering, School of Engineering, Brown University, Providence, Rhode Island 02912, USA
| | - Jonghwan Lee
- Center for Biomedical Engineering, School of Engineering, Brown University, Providence, Rhode Island 02912, USA
- Carney Institute for Brain Science, Brown University, Providence, Rhode Island 02912, USA
| |
Collapse
|
19
|
Nonhuman Primate Optogenetics: Current Status and Future Prospects. ADVANCES IN EXPERIMENTAL MEDICINE AND BIOLOGY 2021; 1293:345-358. [PMID: 33398825 DOI: 10.1007/978-981-15-8763-4_22] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
Nonhuman primates (NHPs) have widely and crucially been utilized as model animals for understanding various higher brain functions and neurological disorders since their behavioral actions mimic both normal and disease states in humans. To know about how such behaviors emerge from the functions and dysfunctions of complex neural networks, it is essential to define the role of a particular pathway or neuron-type constituting these networks. Optogenetics is a potential technique that enables analyses of network functions. However, because of the large size of the NHP brain and the difficulty in creating genetically modified animal models, this technique is currently still hard to apply effectively and efficiently to NHP neuroscience. In this article, we focus on the issues that should be overcome for the development of NHP optogenetics, with special reference to the gene introduction strategy. We review the recent breakthroughs that have been made in NHP optogenetics to address these issues and discuss future prospects regarding more effective and efficient approaches to successful optogenetic manipulation in NHPs.
Collapse
|
20
|
Influence of tie line length and volume ratio on the partition behavior of peripheral blood and conjugated CD34 antibody in polymer-polymer aqueous two-phase systems. Sep Purif Technol 2021. [DOI: 10.1016/j.seppur.2020.117830] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
|
21
|
Schmidt A, Liebelt G, Striesow J, Freund E, von Woedtke T, Wende K, Bekeschus S. The molecular and physiological consequences of cold plasma treatment in murine skin and its barrier function. Free Radic Biol Med 2020; 161:32-49. [PMID: 33011275 DOI: 10.1016/j.freeradbiomed.2020.09.026] [Citation(s) in RCA: 25] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/18/2020] [Revised: 09/21/2020] [Accepted: 09/28/2020] [Indexed: 12/12/2022]
Abstract
Cold plasma technology is an emerging tool facilitating the spatially controlled delivery of a multitude of reactive species (ROS) to the skin. While the therapeutic efficacy of plasma treatment has been observed in several types of diseases, the fundamental consequences of plasma-derived ROS on skin physiology remain unknown. We aimed to bridge this gap since the epidermal skin barrier and perfusion plays a vital role in health and disease by maintaining homeostasis and protecting from environmental damage. The intact skin of SKH1 mice was plasma-treated in vivo. Gene and protein expression was analyzed utilizing transcriptomics, qPCR, and Western blot. Immunofluorescence aided the analysis of percutaneous skin penetration of curcumin. Tissue oxygenation, perfusion, hemoglobin, and water index was investigated using hyperspectral imaging. Reversed-phase liquid-chromatography/mass spectrometry was performed for the identification of changes in the lipid composition and oxidation. Transcriptomic analysis of plasma-treated skin revealed modulation of genes involved in regulating the junctional network (tight, adherence, and gap junctions), which was confirmed using qPCR, Western blot, and immunofluorescence imaging. Plasma treatment increased the disaggregation of cells in the stratum corneum (SC) concomitant with increased tissue oxygenation, gap junctional intercellular communication, and penetration of the model drug curcumin into the SC preceded by altered oxidation of skin lipids and their composition in vivo. In summary, plasma-derived ROS modify the junctional network, which promoted tissue oxygenation, oxidation of SC-lipids, and restricted penetration of the model drug curcumin, implicating that plasma may provide a novel and sensitive tool of skin barrier regulation.
Collapse
Affiliation(s)
- Anke Schmidt
- Plasma Life Science and ZIK Plasmatis, Leibniz Institute for Plasma Science and Technology (INP), Felix-Hausdorff-Str. 2, 17489, Greifswald, Germany
| | - Grit Liebelt
- Plasma Life Science and ZIK Plasmatis, Leibniz Institute for Plasma Science and Technology (INP), Felix-Hausdorff-Str. 2, 17489, Greifswald, Germany
| | - Johanna Striesow
- Plasma Life Science and ZIK Plasmatis, Leibniz Institute for Plasma Science and Technology (INP), Felix-Hausdorff-Str. 2, 17489, Greifswald, Germany
| | - Eric Freund
- Plasma Life Science and ZIK Plasmatis, Leibniz Institute for Plasma Science and Technology (INP), Felix-Hausdorff-Str. 2, 17489, Greifswald, Germany; Department of General Visceral, Thoracic, and Vascular Surgery, Greifswald University Medical Center, Sauerbruchstr. DZ7, 17475, Greifswald, Germany
| | - Thomas von Woedtke
- Plasma Life Science and ZIK Plasmatis, Leibniz Institute for Plasma Science and Technology (INP), Felix-Hausdorff-Str. 2, 17489, Greifswald, Germany; Institute for Hygiene and Environmental Medicine, Greifswald University Medical Center, Sauerbruchstr., 17489, Greifswald, Germany
| | - Kristian Wende
- Plasma Life Science and ZIK Plasmatis, Leibniz Institute for Plasma Science and Technology (INP), Felix-Hausdorff-Str. 2, 17489, Greifswald, Germany
| | - Sander Bekeschus
- Plasma Life Science and ZIK Plasmatis, Leibniz Institute for Plasma Science and Technology (INP), Felix-Hausdorff-Str. 2, 17489, Greifswald, Germany.
| |
Collapse
|
22
|
Kho EA, Fernandes JN, Kotze AC, Fox GP, Sikulu-Lord MT, Beasley AM, Moore SS, James PJ. Influence of environmental factors on the detection of blood in sheep faeces using visible-near-infrared spectroscopy as a measure of Haemonchus contortus infection. Parasit Vectors 2020; 13:591. [PMID: 33228768 PMCID: PMC7684953 DOI: 10.1186/s13071-020-04468-6] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/20/2020] [Accepted: 11/05/2020] [Indexed: 01/05/2023] Open
Abstract
BACKGROUND Existing diagnostic methods for the parasitic gastrointestinal nematode, Haemonchus contortus, are time consuming and require specialised expertise, limiting their utility in the field. A practical, on-farm diagnostic tool could facilitate timely treatment decisions, thereby preventing losses in production and flock welfare. We previously demonstrated the ability of visible-near-infrared (Vis-NIR) spectroscopy to detect and quantify blood in sheep faeces with high accuracy. Here we report our investigation of whether variation in sheep type and environment affect the prediction accuracy of Vis-NIR spectroscopy in quantifying blood in faeces. METHODS Visible-NIR spectra were obtained from worm-free sheep faeces collected from different environments and sheep types in South Australia (SA) and New South Wales, Australia and spiked with various sheep blood concentrations. Spectra were analysed using principal component analysis (PCA), and calibration models were built around the haemoglobin (Hb) wavelength region (387-609 nm) using partial least squares regression. Models were used to predict Hb concentrations in spiked faeces from SA and naturally infected sheep faeces from Queensland (QLD). Samples from QLD were quantified using Hemastix® test strip and FAMACHA© diagnostic test scores. RESULTS Principal component analysis showed that location, class of sheep and pooled versus individual samples were factors affecting the Hb predictions. The models successfully differentiated 'healthy' SA samples from those requiring anthelmintic treatment with moderate to good prediction accuracy (sensitivity 57-94%, specificity 44-79%). The models were not predictive for blood in the naturally infected QLD samples, which may be due in part to variability of faecal background and blood chemistry between samples, or the difference in validation methods used for blood quantification. PCA of the QLD samples, however, identified a difference between samples containing high and low quantities of blood. CONCLUSION This study demonstrates the potential of Vis-NIR spectroscopy for estimating blood concentration in faeces from various types of sheep and environmental backgrounds. However, the calibration models developed here did not capture sufficient environmental variation to accurately predict Hb in faeces collected from environments different to those used in the calibration model. Consequently, it will be necessary to establish models that incorporate samples that are more representative of areas where H. contortus is endemic.
Collapse
Affiliation(s)
- Elise A. Kho
- The Queensland Alliance for Agriculture and Food Innovation, The University of Queensland, St. Lucia, QLD 4067 Australia
| | - Jill N. Fernandes
- The Queensland Alliance for Agriculture and Food Innovation, The University of Queensland, St. Lucia, QLD 4067 Australia
| | - Andrew C. Kotze
- Commonwealth Scientific and Industrial Research Organisation (CSIRO) Agriculture and Food, St. Lucia, QLD 4067 Australia
| | - Glen P. Fox
- Department of Food Science and Technology, University of California, Davis, CA 95616 USA
| | - Maggy T. Sikulu-Lord
- The School of Public Health, The University of Queensland, Herston, Queensland 4006 Australia
| | - Anne M. Beasley
- The School of Agriculture & Food Sciences, The University of Queensland, Gatton, QLD 4343 Australia
| | - Stephen S. Moore
- The Queensland Alliance for Agriculture and Food Innovation, The University of Queensland, St. Lucia, QLD 4067 Australia
| | - Peter J. James
- The Queensland Alliance for Agriculture and Food Innovation, The University of Queensland, St. Lucia, QLD 4067 Australia
| |
Collapse
|
23
|
Dervieux E, Bodinier Q, Uhring W, Théron M. Measuring hemoglobin spectra: searching for carbamino-hemoglobin. JOURNAL OF BIOMEDICAL OPTICS 2020; 25:JBO-200170RR. [PMID: 33098280 PMCID: PMC7610246 DOI: 10.1117/1.jbo.25.10.105001] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/08/2020] [Accepted: 09/28/2020] [Indexed: 05/06/2023]
Abstract
SIGNIFICANCE The arterial carbon dioxide (CO2) partial pressure PaCO2 is a clinically relevant variable. However, its measurement requires arterial blood sampling or bulky and expensive transcutaneous PtcCO2 meters. While the spectrophotometric determination of hemoglobin species-such as oxy-hemoglobin (O2Hb) and deoxy-hemoglobin (HHb)-allowed for the development of pulse oximetry, the measurement of CO2 blood content with minimal discomfort has not been addressed yet. AIM Characterizing human carbamino-hemoglobin (CO2Hb) absorption spectrum, which is missing from the literature. Providing the theoretical background that will allow for transcutaneous, noninvasive PaCO2 measurements. APPROACH A tonometry-based approach was used to obtain gas-equilibrated, lysed, diluted human blood. Equilibration was performed with both CO2, dinitrogen (N2), and ambient air. Spectrophotometric measurements were carried out on the 235- to 1000-nm range. A theoretical background was also derived from that of pulse oximetry. RESULTS The absorption spectra of both CO2Hb and HHb were extremely close and comparable with that of state-of-the-art HHb. The above-mentioned theoretical background led to an estimated relative error above 30% on the measured amount of CO2Hb in a subject's blood. Auxiliary measurements revealed that the use of ethylene diamine tetraacetic acid did not interfere with spectrophotometric measurements, whereas sodium metabisulfite did. CONCLUSIONS CO2Hb absorption spectrum was measured for the first time. Such spectrum being close to that of HHb, the use of a theoretical background based on pulse oximetry theory for noninvasive PaCO2 measurement seems extremely challenging.
Collapse
Affiliation(s)
- Emmanuel Dervieux
- BiOSENCY, Cesson-Sévigné, France
- University of Strasbourg and CNRS, Strasbourg Cedex, France
- Address all correspondence to Emmanuel Dervieux,
| | | | | | - Michaël Théron
- Université de Bretagne Occidentale, ORPHY, Brest, France
| |
Collapse
|
24
|
Off-Peak 594-nm Light Surpasses On-Peak 532-nm Light in Silencing Distant ArchT-Expressing Neurons In Vivo. iScience 2020; 23:101276. [PMID: 32599561 PMCID: PMC7326739 DOI: 10.1016/j.isci.2020.101276] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/04/2019] [Revised: 03/23/2020] [Accepted: 06/11/2020] [Indexed: 01/02/2023] Open
Abstract
For large brain volume manipulations using optogenetics, both effective opsin excitation and efficient light delivery with minimal light absorption are required to minimize the illuminating light intensity and concomitant off-target effects. ArchT, a widely used potent inhibitory opsin, is commonly activated by 532-nm light, which lies on its in vitro excitation peak. However, 532-nm light also lies on a peak range of the hemoglobin absorption spectrum. Therefore, we predicted that 594-nm light is superior in suppressing distant ArchT-expressing neurons, which is slightly off the ArchT-excitation-plateau and largely off the peak of the hemoglobin absorption spectrum. We quantitatively tested this prediction by the electrophysiological recording of the rat cortex in vivo. At illumination distances greater than 500 μm, 594-nm light was more effective than 532-nm light. Its superiority increased with distance. These results validate our prediction and highlight the significance of excitation-absorption trade-off in selecting illumination wavelength for optogenetics in vivo. Wavelength-dependency of optogenetic neuronal control was directly measured in vivo Off-peak light silence 1-mm-distant ArchT-neuron twice more than on-peak light in vivo Superiority of off-peak light at distance arose from its less absorption of light Simulation of light propagation supported unexpectedly large effect of hemoglobin
Collapse
|
25
|
Song W, Shao W, Yi W, Liu R, Desai M, Ness S, Yi J. Visible light optical coherence tomography angiography (vis-OCTA) facilitates local microvascular oximetry in the human retina. BIOMEDICAL OPTICS EXPRESS 2020; 11:4037-4051. [PMID: 33014584 PMCID: PMC7510897 DOI: 10.1364/boe.395843] [Citation(s) in RCA: 18] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/21/2020] [Revised: 06/18/2020] [Accepted: 06/22/2020] [Indexed: 05/06/2023]
Abstract
We report herein the first visible light optical coherence tomography angiography (vis-OCTA) for human retinal imaging. Compared to the existing vis-OCT systems, we devised a spectrometer with a narrower bandwidth to increase the spectral power density for OCTA imaging, while retaining the major spectral contrast in the blood. We achieved a 100 kHz A-line rate, the fastest acquisition speed reported so far for human retinal vis-OCT. We rigorously optimized the imaging protocol such that a single acquisition took < 6 seconds with a field of view (FOV) of 3×7.8 mm2. The angiography enables accurate localization of microvasculature down to the capillary level and thus enables oximetry at vessels < 100 µm in diameter. We demonstrated microvascular hemoglobin oxygen saturation (sO2) at the feeding and draining vessels at the perifoveal region. The longitudinal repeatability was assessed by < 5% coefficient of variation (CV). The unique capabilities of our vis-OCTA system may allow studies on the role of microvascular oxygen in various retinal pathologies.
Collapse
Affiliation(s)
- Weiye Song
- Department of Medicine, Boston University School of Medicine, Boston Medical Center, Boston 02118, USA
| | - Wenjun Shao
- Department of Medicine, Boston University School of Medicine, Boston Medical Center, Boston 02118, USA
| | - Wei Yi
- Department of Medicine, Boston University School of Medicine, Boston Medical Center, Boston 02118, USA
| | - Rongrong Liu
- Department of Biomedical Engineering, Northwestern University, Evanston, IL 60208, USA
| | - Manishi Desai
- Department of Ophthalmology, Boston University School of Medicine, Boston Medical Center, Boston 02118, USA
| | - Steven Ness
- Department of Ophthalmology, Boston University School of Medicine, Boston Medical Center, Boston 02118, USA
| | - Ji Yi
- Department of Medicine, Boston University School of Medicine, Boston Medical Center, Boston 02118, USA
- Department of Biomedical Engineering, Boston University, Boston 02118, USA
- Department of Electronic and Computer Engineering, Boston University, Boston 02118, USA
| |
Collapse
|
26
|
Kim J, Lee SK, Schellingerhout D, Nahrendorf M, Kim K, Kim J, Kim DE. Spectroscopic Assessment of Gold Nanoparticle Biodistribution Using Surface Plasmon Resonance Phenomena. ACS Biomater Sci Eng 2019; 5:6389-6394. [PMID: 33417791 DOI: 10.1021/acsbiomaterials.9b01079] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
Abstract
Pharmacokinetic (PK) evaluation of nanomaterials are crucial for further clinical development of imaging nanomaterials. In spite of huge advances in nanoparticle-based biomedical research, PK assessment typically requires substantial resources. Here, we show a simple, inexpensive, and yet precise analytical method applicable to the PK interrogation of gold nanoparticles (AuNPs) in the body. We have developed a UV-vis spectroscopic technique that utilizes mechanochemical treatments to separate AuNPs from tissues and then employs surface plasmon of extracted AuNPs to quantify their distribution in the body. This method allows the detection of 10 μg/mL of AuNPs in solution, as was confirmed by using inductively coupled plasma mass spectrometry. We demonstrate biodistribution of fibrin-targeted AuNPs that enable microCT-based visualization of arterial thrombi in mice: blood and thrombi as well as various organs. We believe that our method is generally applicable to most PK studies utilizing AuNPs in medical applications.
Collapse
Affiliation(s)
- Jiwon Kim
- Molecular Imaging and Neurovascular Research (MINER) Laboratory, Dongguk University College of Medicine, Goyang 10326, Korea
| | - Su-Kyoung Lee
- Molecular Imaging and Neurovascular Research (MINER) Laboratory, Dongguk University College of Medicine, Goyang 10326, Korea
| | - Dawid Schellingerhout
- Departments of Radiology and Experimental Diagnostic Imaging, M. D. Anderson Cancer Center, Houston, Texas 77030, United States
| | - Matthias Nahrendorf
- Center for Systems Biology, Massachusetts General Hospital and Harvard Medical School, Boston, Massachusetts 02114, United States
| | - Kwangmeyung Kim
- Biomedical Research Institute, Korea Institute of Science and Technology, Seoul 02792, Korea
| | - Jongseong Kim
- Department of Biomedical Sciences, College of Medicine, Korea University, Seoul 02841, Korea
| | - Dong-Eog Kim
- Molecular Imaging and Neurovascular Research (MINER) Laboratory, Dongguk University College of Medicine, Goyang 10326, Korea
| |
Collapse
|
27
|
Quantification of total haemoglobin concentrations in human whole blood by spectroscopic visible-light optical coherence tomography. Sci Rep 2019; 9:15115. [PMID: 31641197 PMCID: PMC6806004 DOI: 10.1038/s41598-019-51721-9] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/12/2019] [Accepted: 10/02/2019] [Indexed: 11/08/2022] Open
Abstract
The non-invasive quantification of total haemoglobin concentrations [tHb] is highly desired for the assessment of haematologic disorders in vulnerable patient groups, but invasive blood sampling is still the gold standard in current clinical practice. This work demonstrates the potential of visible-light spectroscopic optical coherence tomography (sOCT) for quantifying the [tHb] in human whole blood. To accurately quantify the [tHb] from the substantial optical attenuation by blood in the visible wavelength range, we used a combination of zero-delay acquisition and focus tracking that ensures optimal system sensitivity at any depth inside the sample. Subsequently, we developed an analysis model to adequately correct for the high scattering contribution by red blood cells to the sOCT signal. We validate our method and compare it to conventional sOCT (without focus tracking and zero-delay acquisition) through ex-vivo measurements on flowing human whole blood, with [tHb] values in the clinical range of 7-23 g/dL. For our method with optimized sensitivity, the measured and expected values correlate well (Pearson correlation coefficient = 0.89, p < 0.01), with a precision of 3.8 g/dL. This is a considerable improvement compared to conventional sOCT (Pearson correlation coefficient = 0.59, p = 0.16; precision of 9.1 g/dL).
Collapse
|
28
|
Blum NT, Gyorkos CM, Narowetz SJ, Mueller EN, Goodwin AP. Phospholipid-Coated Hydrophobic Mesoporous Silica Nanoparticles Enhance Thrombectomy by High-Intensity Focused Ultrasound with Low Production of Embolism-Inducing Clot Debris. ACS APPLIED MATERIALS & INTERFACES 2019; 11:36324-36332. [PMID: 31556582 PMCID: PMC8051144 DOI: 10.1021/acsami.9b11095] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/08/2023]
Abstract
Here we report the efficacy of a nanoparticle-assisted high-intensity focused ultrasound (HIFU) treatment that selectively destroys blood clots while minimizing generation of microparticles, or microemboli, that can cause further complications postsurgery. Treatment of malignant blood clots (thrombi) and the resulting emboli are critical problems for numerous patients, and treatments addressing these conditions would benefit from advancements in noninvasive procedures such as HIFU. While recanalization of occlusive blood clots is currently addressed with surgical intervention that seeks to minimize formation of large emboli, there is a danger of microemboli (micrometer-size particles) that have been theorized to be responsible for the poor correlation between apparent surgical success and patient outcome. Here, the addition of phospholipid-coated hydrophobically modified silica nanoparticles (P@hMSNs) improved the efficacy of HIFU treatment by serving as cavitation nuclei for mechanical disruption of thrombi. This treatment was evaluated for the ability to clear the HIFU focal area of a thick and dense thrombus within 10 min. Moreover, it was found that the use of P@hMSN+HIFU treatment generated a significantly smaller microembolic load as compared to comparison techniques, including a HIFU + microbubble contrast agent, HIFU alone, and direct mechanical disruption. This reduction in the microembolic load can occur either with primary removal of the clot by P@hMSN+HIFU or by insonation of the clot fragments after mechanical thrombectomy. Lastly, this method was evaluated in a flow model, where nonocclusive model thrombi and model emboli were mechanically ablated within the focal area within 15 s. Together, these results represent a combination therapy capable of resolving thrombi and microembolisms resulting from thrombectomy through localized destruction of clotted material.
Collapse
|
29
|
Kolda L, Krejcar O, Selamat A, Kuca K, Fadeyi O. Multi-Biometric System Based on Cutting-Edge Equipment for Experimental Contactless Verification. SENSORS 2019; 19:s19173709. [PMID: 31455045 PMCID: PMC6749222 DOI: 10.3390/s19173709] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 04/28/2019] [Revised: 08/18/2019] [Accepted: 08/20/2019] [Indexed: 11/16/2022]
Abstract
Biometric verification methods have gained significant popularity in recent times, which has brought about their extensive usage. In light of theoretical evidence surrounding the development of biometric verification, we proposed an experimental multi-biometric system for laboratory testing. First, the proposed system was designed such that it was able to identify and verify a user through the hand contour, and blood flow (blood stream) at the upper part of the hand. Next, we detailed the hard and software solutions for the system. A total of 40 subjects agreed to be a part of data generation team, which produced 280 hand images. The core of this paper lies in evaluating individual metrics, which are functions of frequency comparison of the double type faults with the EER (Equal Error Rate) values. The lowest value was measured for the case of the modified Hausdorff distance metric - Maximally Helicity Violating (MHV). Furthermore, for the verified biometric characteristics (Hamming distance and MHV), appropriate and suitable metrics have been proposed and experimented to optimize system precision. Thus, the EER value for the designed multi-biometric system in the context of this work was found to be 5%, which proves that metrics consolidation increases the precision of the multi-biometric system. Algorithms used for the proposed multi-biometric device shows that the individual metrics exhibit significant accuracy but perform better on consolidation, with a few shortcomings.
Collapse
Affiliation(s)
- Lukas Kolda
- Faculty of Informatics and Management, University of Hradec Kralove, Hradec Kralove 50003, Czech Republic
| | - Ondrej Krejcar
- Faculty of Informatics and Management, University of Hradec Kralove, Hradec Kralove 50003, Czech Republic.
| | - Ali Selamat
- Faculty of Informatics and Management, University of Hradec Kralove, Hradec Kralove 50003, Czech Republic
- Malaysia Japan International Institute of Technology (MJIIT), Universiti Teknologi Malaysia Kuala Lumpur, Jalan Sultan Yahya Petra, Kuala Lumpur 54100, Malaysia
- Media and Games Center of Excellence (MagicX), Universiti Teknologi Malaysia, Skudai 81310, Malaysia
- School of Computing, Faculty of Engineering, Universiti Teknologi Malaysia (UTM), Skudai 81310, Malaysia
| | - Kamil Kuca
- Faculty of Informatics and Management, University of Hradec Kralove, Hradec Kralove 50003, Czech Republic
- Malaysia Japan International Institute of Technology (MJIIT), Universiti Teknologi Malaysia Kuala Lumpur, Jalan Sultan Yahya Petra, Kuala Lumpur 54100, Malaysia
| | - Oluwaseun Fadeyi
- Faculty of Informatics and Management, University of Hradec Kralove, Hradec Kralove 50003, Czech Republic
- Department of Geology, Faculty of Space and Environmental Science, University of Trier, 54296 Trier, Germany
| |
Collapse
|
30
|
Davoodzadeh N, Cano-Velázquez MS, Halaney DL, Jonak CR, Binder DK, Aguilar G. Optical Access to Arteriovenous Cerebral Microcirculation Through a Transparent Cranial Implant. Lasers Surg Med 2019; 51:920-932. [PMID: 31236997 DOI: 10.1002/lsm.23127] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 06/01/2019] [Indexed: 01/20/2023]
Abstract
BACKGROUND AND OBJECTIVE Microcirculation plays a critical role in physiologic processes and several disease states. Laser speckle imaging (LSI) is a full-field, real-time imaging technique capable of mapping microvessel networks and providing relative flow velocity within the vessels. In this study, we demonstrate that LSI combine with multispectral reflectance imaging (MSRI), which allows for distinction between veins and arteries in the vascular flow maps produced by LSI. We apply this combined technique to mouse cerebral vascular network in vivo, comparing imaging through the skull, to the dura mater and brain directly through a craniectomy, and through a transparent cranial "Window to the Brain" (WttB) implant. STUDY DESIGN/MATERIALS AND METHODS The WttB implant used in this study is made of a nanocrystalline Yttria-Stabilized-Zirconia ceramic. MSRI was conducted using white-light illumination and filtering the reflected light for 560, 570, 580, 590, 600, and 610 nm. LSI was conducted using an 810 nm continuous wave near-infrared laser with incident power of 100 mW, and the reflected speckle pattern was captured by a complementary metal-oxide-semiconductor (CMOS) camera. RESULTS Seven vessel branches were analyzed and comparison was made between imaging through the skull, craniectomy, and WttB implant. Through the skull, MSRI did not detect any vessels, and LSI could not image microvessels. Imaging through the WttB implant, MSRI was able to identify veins versus arteries, and LSI was able to image microvessels with only slightly higher signal-to-noise ratio and lower sharpness than imaging the brain through a craniectomy. CONCLUSIONS This study demonstrates the ability to perform MSRI-LSI across a transparent cranial implant, to allow for cerebral vascular networks to be mapped, including microvessels. These images contain additional information such as vein-artery separation and relative blood flow velocities, information which is of value scientifically and medically. The WttB implant provides substantial improvements over imaging through the murine cranial bone, where microvessels are not visible and MSRI cannot be performed. Lasers Surg. Med. © 2019 Wiley Periodicals, Inc.
Collapse
Affiliation(s)
- Nami Davoodzadeh
- Department of Mechanical Engineering, University of California, Bourns Hall A342 900 University Ave., Riverside, California, 92521
| | - Mildred S Cano-Velázquez
- Instituto de Investigaciones en Materiales, Universidad Nacional Autónoma de México, Circuito Exterior S/N, Ciudad Universitaria, Coyoacán, Mexico City, 04510, Mexico
| | - David L Halaney
- Department of Mechanical Engineering, University of California, Bourns Hall A342 900 University Ave., Riverside, California, 92521
| | - Carrie R Jonak
- Division of Biomedical Sciences, School of Medicine, University of California, 1126 Webber Hall 900 University Ave., Riverside, California, 92521
| | - Devin K Binder
- Division of Biomedical Sciences, School of Medicine, University of California, 1126 Webber Hall 900 University Ave., Riverside, California, 92521
| | - Guillermo Aguilar
- Department of Mechanical Engineering, University of California, Bourns Hall A342 900 University Ave., Riverside, California, 92521
| |
Collapse
|
31
|
Fabelo H, Halicek M, Ortega S, Shahedi M, Szolna A, Piñeiro JF, Sosa C, O'Shanahan AJ, Bisshopp S, Espino C, Márquez M, Hernández M, Carrera D, Morera J, Callico GM, Sarmiento R, Fei B. Deep Learning-Based Framework for In Vivo Identification of Glioblastoma Tumor using Hyperspectral Images of Human Brain. SENSORS 2019; 19:s19040920. [PMID: 30813245 PMCID: PMC6412736 DOI: 10.3390/s19040920] [Citation(s) in RCA: 70] [Impact Index Per Article: 14.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 01/24/2019] [Revised: 02/18/2019] [Accepted: 02/20/2019] [Indexed: 02/02/2023]
Abstract
The main goal of brain cancer surgery is to perform an accurate resection of the tumor, preserving as much normal brain tissue as possible for the patient. The development of a non-contact and label-free method to provide reliable support for tumor resection in real-time during neurosurgical procedures is a current clinical need. Hyperspectral imaging is a non-contact, non-ionizing, and label-free imaging modality that can assist surgeons during this challenging task without using any contrast agent. In this work, we present a deep learning-based framework for processing hyperspectral images of in vivo human brain tissue. The proposed framework was evaluated by our human image database, which includes 26 in vivo hyperspectral cubes from 16 different patients, among which 258,810 pixels were labeled. The proposed framework is able to generate a thematic map where the parenchymal area of the brain is delineated and the location of the tumor is identified, providing guidance to the operating surgeon for a successful and precise tumor resection. The deep learning pipeline achieves an overall accuracy of 80% for multiclass classification, improving the results obtained with traditional support vector machine (SVM)-based approaches. In addition, an aid visualization system is presented, where the final thematic map can be adjusted by the operating surgeon to find the optimal classification threshold for the current situation during the surgical procedure.
Collapse
Affiliation(s)
- Himar Fabelo
- Department of Bioengineering, The University of Texas at Dallas, 800 W. Campbell Road, Richardson, TX 75080, USA.
- Institute for Applied Microelectronics (IUMA), University of Las Palmas de Gran Canaria (ULPGC), 35017 Las Palmas de Gran Canaria, Spain.
| | - Martin Halicek
- Department of Bioengineering, The University of Texas at Dallas, 800 W. Campbell Road, Richardson, TX 75080, USA.
- Department of Biomedical Engineering, Emory University and Georgia Institute of Technology, 1841 Clifton Road NE, Atlanta, GA 30329, USA.
| | - Samuel Ortega
- Institute for Applied Microelectronics (IUMA), University of Las Palmas de Gran Canaria (ULPGC), 35017 Las Palmas de Gran Canaria, Spain.
| | - Maysam Shahedi
- Department of Bioengineering, The University of Texas at Dallas, 800 W. Campbell Road, Richardson, TX 75080, USA.
| | - Adam Szolna
- Department of Neurosurgery, University Hospital Doctor Negrin of Gran Canaria, Barranco de la Ballena s/n, 35010 Las Palmas de Gran Canaria, Spain.
| | - Juan F Piñeiro
- Department of Neurosurgery, University Hospital Doctor Negrin of Gran Canaria, Barranco de la Ballena s/n, 35010 Las Palmas de Gran Canaria, Spain.
| | - Coralia Sosa
- Department of Neurosurgery, University Hospital Doctor Negrin of Gran Canaria, Barranco de la Ballena s/n, 35010 Las Palmas de Gran Canaria, Spain.
| | - Aruma J O'Shanahan
- Department of Neurosurgery, University Hospital Doctor Negrin of Gran Canaria, Barranco de la Ballena s/n, 35010 Las Palmas de Gran Canaria, Spain.
| | - Sara Bisshopp
- Department of Neurosurgery, University Hospital Doctor Negrin of Gran Canaria, Barranco de la Ballena s/n, 35010 Las Palmas de Gran Canaria, Spain.
| | - Carlos Espino
- Department of Neurosurgery, University Hospital Doctor Negrin of Gran Canaria, Barranco de la Ballena s/n, 35010 Las Palmas de Gran Canaria, Spain.
| | - Mariano Márquez
- Department of Neurosurgery, University Hospital Doctor Negrin of Gran Canaria, Barranco de la Ballena s/n, 35010 Las Palmas de Gran Canaria, Spain.
| | - María Hernández
- Department of Neurosurgery, University Hospital Doctor Negrin of Gran Canaria, Barranco de la Ballena s/n, 35010 Las Palmas de Gran Canaria, Spain.
| | - David Carrera
- Department of Neurosurgery, University Hospital Doctor Negrin of Gran Canaria, Barranco de la Ballena s/n, 35010 Las Palmas de Gran Canaria, Spain.
| | - Jesús Morera
- Department of Neurosurgery, University Hospital Doctor Negrin of Gran Canaria, Barranco de la Ballena s/n, 35010 Las Palmas de Gran Canaria, Spain.
| | - Gustavo M Callico
- Institute for Applied Microelectronics (IUMA), University of Las Palmas de Gran Canaria (ULPGC), 35017 Las Palmas de Gran Canaria, Spain.
| | - Roberto Sarmiento
- Institute for Applied Microelectronics (IUMA), University of Las Palmas de Gran Canaria (ULPGC), 35017 Las Palmas de Gran Canaria, Spain.
| | - Baowei Fei
- Department of Bioengineering, The University of Texas at Dallas, 800 W. Campbell Road, Richardson, TX 75080, USA.
- Advanced Imaging Research Center, University of Texas Southwestern Medical Center, 5323 Harry Hine Blvd, Dallas, TX 75390, USA.
- Department of Radiology, University of Texas Southwestern Medical Center, 5323 Harry Hine Blvd, Dallas, TX 75390, USA.
| |
Collapse
|
32
|
Platelets inhibit apoptotic lung epithelial cell death and protect mice against infection-induced lung injury. Blood Adv 2019; 3:432-445. [PMID: 30733303 PMCID: PMC6373758 DOI: 10.1182/bloodadvances.2018026286] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/21/2018] [Accepted: 01/09/2019] [Indexed: 12/17/2022] Open
Abstract
Thrombocytopenia is associated with worse outcomes in patients with acute respiratory distress syndrome, which is most commonly caused by infection and marked by alveolar-capillary barrier disruption. However, the mechanisms by which platelets protect the lung alveolar-capillary barrier during infectious injury remain unclear. We found that natively thrombocytopenic Mpl -/- mice deficient in the thrombopoietin receptor sustain severe lung injury marked by alveolar barrier disruption and hemorrhagic pneumonia with early mortality following acute intrapulmonary Pseudomonas aeruginosa (PA) infection; barrier disruption was attenuated by platelet reconstitution. Although PA infection was associated with a brisk neutrophil influx, depletion of airspace neutrophils failed to substantially mitigate PA-triggered alveolar barrier disruption in Mpl -/- mice. Rather, PA cell-free supernatant was sufficient to induce lung epithelial cell apoptosis in vitro and in vivo and alveolar barrier disruption in both platelet-depleted mice and Mpl -/- mice in vivo. Cell-free supernatant from PA with genetic deletion of the type 2 secretion system, but not the type 3 secretion system, mitigated lung epithelial cell death in vitro and lung injury in Mpl -/- mice. Moreover, platelet releasates reduced poly (ADP ribose) polymerase cleavage and lung injury in Mpl -/- mice, and boiling of platelet releasates, but not apyrase treatment, abrogated PA supernatant-induced lung epithelial cell cytotoxicity in vitro. These findings indicate that while neutrophil airspace influx does not potentiate infectious lung injury in the thrombocytopenic host, platelets and their factors protect against severe pulmonary complications from pathogen-secreted virulence factors that promote host cell death even in the absence of overt infection.
Collapse
|
33
|
Liu R, Song W, Backman V, Yi J. Quantitative quality-control metrics for in vivo oximetry in small vessels by visible light optical coherence tomography angiography. BIOMEDICAL OPTICS EXPRESS 2019; 10:465-486. [PMID: 30800493 PMCID: PMC6377897 DOI: 10.1364/boe.10.000465] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/19/2018] [Revised: 12/14/2018] [Accepted: 12/14/2018] [Indexed: 05/23/2023]
Abstract
Biological functions rely on local microvasculature to deliver oxygen and nutrients and carry away metabolic waste. Alterations to local oxygenation levels are manifested in diseases including cancer, diabetes mellitus, etc. The ability to quantify oxygen saturation (sO2) within microvasculature in vivo to assess local tissue oxygenation and metabolic function is highly sought after. Visible light optical coherence tomography (vis-OCT) angiography has shown promise in reaching this goal. However, achieving reliable measurements in small vessels can be challenging due to the reduced contrast and requires data averaging to improve the spectral data quality. Therefore, a method for quality-control of the vis-OCT data from small vessels becomes essential to reject unreliable readings. In this work, we present a quantitative metrics to evaluate the spectral data for a reliable measurement of sO2, including angiography signal to noise ratio (SNR), spectral anomaly detection and discard, and theory-experiment correlation analysis. The thresholds for each quantity can be flexibly adjusted according to different applications and system performance. We used these metrics to measure sO2 of C57BL/6J mouse lower extremity microvasculature and validated it by introducing hyperoxia for expected sO2 changes. After validation, we applied this protocol on C57BL/6J mouse ear microvasculature to conduct in vivo small blood vessel OCT oximetry. This work seeks to standardize the data processing method for in vivo oximetry in small vessels by vis-OCT.
Collapse
Affiliation(s)
- Rongrong Liu
- Department of Biomedical Engineering, Northwestern University, Evanston, IL, 60208, USA
| | - Weiye Song
- Department of Medicine, Boston University School of Medicine, Boston, MA, 02118, USA
| | - Vadim Backman
- Department of Biomedical Engineering, Northwestern University, Evanston, IL, 60208, USA
| | - Ji Yi
- Department of Medicine, Boston University School of Medicine, Boston, MA, 02118, USA
| |
Collapse
|
34
|
Soltani S, Ojaghi A, Robles FE. Deep UV dispersion and absorption spectroscopy of biomolecules. BIOMEDICAL OPTICS EXPRESS 2019; 10:487-499. [PMID: 30800494 PMCID: PMC6377894 DOI: 10.1364/boe.10.000487] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/12/2018] [Revised: 12/07/2018] [Accepted: 12/09/2018] [Indexed: 05/03/2023]
Abstract
Owing to the high precision and sensitivity of optical systems, there is an increasing demand for optical methods that quantitatively characterize the physical and chemical properties of biological samples. Information extracted from such quantitative methods, through phase and/or amplitude variations of light, can be crucial in the diagnosis, treatment and study of disease. In this work we apply a recently developed quantitative method, called ultraviolet hyperspectral interferometry (UHI), to characterize the dispersion and absorbing properties of various important biomolecules. Our system consists of (1) a broadband light source that spans from the deep-UV to the visible region of the spectrum, and (2) a Mach-Zehnder interferometer to gain access to complex optical properties. We apply this method to characterize (and tabulate) the dispersive and absorptive properties of hemoglobin, beta nicotinamide adenine dinucleotide (NAD), flavin adenine dinucleotide (FAD), elastin, collagen, cytochrome c, tryptophan and DNA. Our results shed new light on the complex properties of important biomolecules.
Collapse
|
35
|
Zakaria R, Allen KJ, Koplin JJ, Crinis N, De Rosa L, Roche P, Greaves RF. Determination of haemoglobin derivatives in aged dried blood spot to estimate haematocrit. ACTA ACUST UNITED AC 2019; 57:1026-1034. [DOI: 10.1515/cclm-2018-0753] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/18/2018] [Accepted: 12/04/2018] [Indexed: 12/18/2022]
Abstract
Abstract
Introduction
Dried blood spot (DBS) sample applications now encompass analytes related to clinical diagnosis, epidemiological studies, therapeutic drug monitoring, pharmacokinetic and toxicokinetic studies. Haematocrit (Hct) and haemoglobin (Hb) at very high or low concentrations may influence the accuracy of measurement quantification of the DBS sample. In this study, we aimed to predict the Hct of the punched DBS through primary spectrophotometric estimation of its haemoglobin-derivative (Hb-drv) content.
Methods
Formic acid solution was used to elute Hb-drv content of 3.2 mm spotted blood from its dry matrix. Direct spectrometry measurement was utilised to scan the extracted Hb-drv in the visible spectrum range of 520–600 nm. The linear relationship between an individual’s Hct percentage and Hb-drv concentration was applied to estimate the Hct level of the blood spot. De-identified whole blood samples were used for the method development and evaluation studies.
Results
The Hb-drv estimation is valid in samples >2 months old. Method validation experiments DBS demonstrate linearity between 82.5 and 207.5 g/L, average coefficient of variation of 3.6% (intra-assay) and 7.7% (inter-assay), analytical recovery of 84%, and a high positive correlation (r=0.88) between Hb-drv and the original whole blood Hct. The Bland-Altman difference plot demonstrates a mean difference of 2.4% between the calculated DBS Hct and the directly measured Hct from fresh whole bloods.
Conclusions
We have successfully developed a simple Hb-drv method to estimate Hct in aged DBS samples. This method can be incorporated into DBS analytical work-flow for the in-situ estimation of Hct and subsequent correction of the analyte of interest as required.
Collapse
Affiliation(s)
- Rosita Zakaria
- School of Health and Biomedical Sciences , RMIT University , Bundoora, Victoria , Australia
- Murdoch Children’s Research Institute , Parkville, Victoria , Australia
| | - Katrina J. Allen
- Murdoch Children’s Research Institute , Parkville, Victoria , Australia
- Department of Paediatrics , University of Melbourne , Parkville, Victoria , Australia
- Department of Allergy and Clinical Immunology , Royal Children’s Hospital , Parkville, Victoria , Australia
| | | | - Nick Crinis
- Clinical Biochemistry, Austin Pathology , Heidelberg, Victoria , Australia
| | - Lidia De Rosa
- Core Laboratory, Pathology , The Royal Children’s Hospital , Parkville, Victoria , Australia
| | - Peter Roche
- School of Health and Biomedical Sciences , RMIT University , Bundoora, Victoria , Australia
| | - Ronda F. Greaves
- School of Health and Biomedical Sciences , RMIT University , Bundoora, Victoria , Australia
- Victorian Clinical Genetics Services, Murdoch Children’s Research Institute , Flemington Rd , Parkville, Victoria 3052 , Australia
| |
Collapse
|
36
|
Winkelmann JA, Eid A, Spicer G, Almassalha LM, Nguyen TQ, Backman V. Spectral contrast optical coherence tomography angiography enables single-scan vessel imaging. LIGHT, SCIENCE & APPLICATIONS 2019; 8:7. [PMID: 30651982 PMCID: PMC6333625 DOI: 10.1038/s41377-018-0117-7] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/25/2018] [Revised: 12/14/2018] [Accepted: 12/15/2018] [Indexed: 05/06/2023]
Abstract
Optical coherence tomography angiography relies on motion for contrast and requires at least two data acquisitions per pointwise scanning location. We present a method termed spectral contrast optical coherence tomography angiography using visible light that relies on the spectral signatures of blood for angiography from a single scan using endogenous contrast. We demonstrate the molecular sensitivity of this method, which enables lymphatic vessel, blood, and tissue discrimination.
Collapse
Affiliation(s)
- James A. Winkelmann
- Department of Biomedical Engineering, Northwestern University, Evanston, IL 60208 USA
| | - Aya Eid
- Department of Biomedical Engineering, Northwestern University, Evanston, IL 60208 USA
| | - Graham Spicer
- Department of Chemical and Biological Engineering, Northwestern University, Evanston, IL 60208 USA
| | - Luay M. Almassalha
- Department of Biomedical Engineering, Northwestern University, Evanston, IL 60208 USA
| | - The-Quyen Nguyen
- Department of Biomedical Engineering, Northwestern University, Evanston, IL 60208 USA
| | - Vadim Backman
- Department of Biomedical Engineering, Northwestern University, Evanston, IL 60208 USA
| |
Collapse
|
37
|
Gao W. Quantitative depth-resolved microcirculation imaging with optical coherence tomography angiography (Part ΙΙ): Microvascular network imaging. Microcirculation 2018; 25:e12376. [DOI: 10.1111/micc.12376] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/10/2017] [Accepted: 04/11/2017] [Indexed: 11/28/2022]
Affiliation(s)
- Wanrong Gao
- Department of Optical Engineering; Nanjing University of Science and Technology; Nanjing Jiangsu China
- MIIT Key Laboratory of Advanced Solid Laser; Nanjing University of Science and Technology; Nanjing Jiangsu China
| |
Collapse
|
38
|
Sullender CT, Mark AE, Clark TA, Esipova TV, Vinogradov SA, Jones TA, Dunn AK. Imaging of cortical oxygen tension and blood flow following targeted photothrombotic stroke. NEUROPHOTONICS 2018; 5:035003. [PMID: 30137881 PMCID: PMC6062776 DOI: 10.1117/1.nph.5.3.035003] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/27/2018] [Accepted: 07/02/2018] [Indexed: 05/24/2023]
Abstract
We present a dual-modality imaging system combining laser speckle contrast imaging and oxygen-dependent quenching of phosphorescence to simultaneously map cortical blood flow and oxygen tension ( pO 2 ) in mice. Phosphorescence signal localization is achieved through the use of a digital micromirror device (DMD) that allows for selective excitation of arbitrary regions of interest. By targeting both excitation maxima of the oxygen-sensitive Oxyphor PtG4, we are able to examine the effects of excitation wavelength on the measured phosphorescence lifetime. We demonstrate the ability to measure the differences in pO 2 between arteries and veins and large changes during a hyperoxic challenge. We dynamically monitor blood flow and pO 2 during DMD-targeted photothrombotic occlusion of an arteriole and highlight the presence of an ischemia-induced depolarization. Chronic tracking of the ischemic lesion over eight days revealed a rapid recovery, with the targeted vessel fully reperfusing and pO 2 returning to baseline values within five days. This system has broad applications for studying the acute and chronic pathophysiology of ischemic stroke and other vascular diseases of the brain.
Collapse
Affiliation(s)
- Colin T. Sullender
- University of Texas at Austin, Department of Biomedical Engineering, Austin, Texas, United States
| | - Andrew E. Mark
- University of Texas at Austin, Department of Biomedical Engineering, Austin, Texas, United States
| | - Taylor A. Clark
- University of Texas at Austin, Department of Psychology, Austin, Texas, United States
- University of Texas at Austin, Institute for Neuroscience, Austin, Texas, United States
| | - Tatiana V. Esipova
- University of Pennsylvania, Department of Biochemistry and Biophysics, Philadelphia, Pennsylvania, United States
| | - Sergei A. Vinogradov
- University of Pennsylvania, Department of Biochemistry and Biophysics, Philadelphia, Pennsylvania, United States
| | - Theresa A. Jones
- University of Texas at Austin, Department of Psychology, Austin, Texas, United States
- University of Texas at Austin, Institute for Neuroscience, Austin, Texas, United States
| | - Andrew K. Dunn
- University of Texas at Austin, Department of Biomedical Engineering, Austin, Texas, United States
- University of Texas at Austin, Institute for Neuroscience, Austin, Texas, United States
| |
Collapse
|
39
|
Alam M, Son T, Toslak D, Lim JI, Yao X. Combining ODR and Blood Vessel Tracking for Artery-Vein Classification and Analysis in Color Fundus Images. Transl Vis Sci Technol 2018; 7:23. [PMID: 29692950 PMCID: PMC5912799 DOI: 10.1167/tvst.7.2.23] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/18/2017] [Accepted: 03/10/2018] [Indexed: 11/04/2022] Open
Abstract
Purpose This study aims to develop a fully automated algorithm for artery–vein (A-V) and arteriole-venule classification and to quantify the effect of hypertension on A-V caliber and tortuosity ratios of nonproliferative diabetic retinopathy (NPDR) patients. Methods We combine an optical density ratio (ODR) analysis and blood vessel tracking (BVT) algorithm to classify arteries and veins and arterioles and venules. An enhanced blood vessel map and ODR analysis are used to determine the blood vessel source nodes. The whole vessel map is then tracked beginning from the source nodes and classified as vein (venule) or artery (arteriole) using vessel curvature and angle information. Fifty color fundus images from NPDR patients are used to test the algorithm. Sensitivity, specificity, and accuracy metrics are measured to validate the classification method compared to ground truths. Results The combined ODR-BVT method demonstrates 97.06% accuracy in identifying blood vessels as vein or artery. Sensitivity and specificity of A-V identification are 97.58%, 97.81%, and 95.89%, 96.68%, respectively. Comparative analysis revealed that the average A-V caliber and tortuosity ratios of NPDR patients with hypertension have 48% and 15.5% decreases, respectively, compared to that of NPDR patients without hypertension. Conclusions Automated A-V classification has been achieved by combined ODR-BVT analysis. Quantitative analysis of color fundus images verified robust performance of the A-V classification. Comparative quantification of A-V caliber and tortuosity ratios provided objective biomarkers to differentiate NPDR groups with and without hypertension. Translational Relevance Automated A-V classification can facilitate quantitative analysis of retinal vascular distortions due to diabetic retinopathy and other eye conditions and provide increased sensitivity for early detection of eye diseases.
Collapse
Affiliation(s)
- Minhaj Alam
- Department of Bioengineering, University of Illinois at Chicago, Chicago, IL, USA
| | - Taeyoon Son
- Department of Bioengineering, University of Illinois at Chicago, Chicago, IL, USA
| | - Devrim Toslak
- Department of Bioengineering, University of Illinois at Chicago, Chicago, IL, USA
| | - Jennifer I Lim
- Department of Ophthalmology and Visual Sciences, University of Illinois at Chicago, Chicago, IL, USA
| | - Xincheng Yao
- Department of Bioengineering, University of Illinois at Chicago, Chicago, IL, USA.,Department of Ophthalmology and Visual Sciences, University of Illinois at Chicago, Chicago, IL, USA
| |
Collapse
|
40
|
Lazareva EN, Tuchin VV. Measurement of refractive index of hemoglobin in the visible/NIR spectral range. JOURNAL OF BIOMEDICAL OPTICS 2018; 23:1-9. [PMID: 29546733 DOI: 10.1117/1.jbo.23.3.035004] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/21/2017] [Accepted: 02/20/2018] [Indexed: 06/08/2023]
Abstract
This study is focused on the measurements of the refractive index of hemoglobin solutions in the visible/near-infrared (NIR) spectral range at room temperature for characteristic laser wavelengths: 480, 486, 546, 589, 644, 656, 680, 930, 1100, 1300, and 1550 nm. Measurements were performed using the multiwavelength Abbe refractometer. Aqua hemoglobin solutions of different concentrations obtained from human whole blood were investigated. The specific increment of refractive index on hemoglobin concentration and the Sellmeier coefficients were calculated.
Collapse
Affiliation(s)
- Ekaterina N Lazareva
- Saratov State University (National Research University), Research Educational Institute of Optics an, Russia
- Immanuel Kant Baltic Federal University, Center for Functionalized Magnetic Materials (FunMagMa), Ka, Russia
| | - Valery V Tuchin
- Saratov State University (National Research University), Research Educational Institute of Optics an, Russia
- Tomsk State University (National Research University), Interdisciplinary Laboratory of Biophotonics,, Russia
- Institute of Precision Mechanics and Control RAS, Laboratory of Laser Diagnostics of Technical and L, Russia
| |
Collapse
|
41
|
Tsai TH, Leggett CL, Trindade AJ, Sethi A, Swager AF, Joshi V, Bergman JJ, Mashimo H, Nishioka NS, Namati E. Optical coherence tomography in gastroenterology: a review and future outlook. JOURNAL OF BIOMEDICAL OPTICS 2017; 22:1-17. [PMID: 29260538 DOI: 10.1117/1.jbo.22.12.121716] [Citation(s) in RCA: 43] [Impact Index Per Article: 6.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/07/2017] [Accepted: 12/05/2017] [Indexed: 05/18/2023]
Abstract
Optical coherence tomography (OCT) is an imaging technique optically analogous to ultrasound that can generate depth-resolved images with micrometer-scale resolution. Advances in fiber optics and miniaturized actuation technologies allow OCT imaging of the human body and further expand OCT utilization in applications including but not limited to cardiology and gastroenterology. This review article provides an overview of current OCT development and its clinical utility in the gastrointestinal tract, including disease detection/differentiation and endoscopic therapy guidance, as well as a discussion of its future applications.
Collapse
Affiliation(s)
- Tsung-Han Tsai
- NinePoint Medical, Inc., Bedford, Massachusetts, United States
| | - Cadman L Leggett
- Mayo Clinics, Division of Gastroenterology and Hepatology, Rochester, Minnesota, United States
| | - Arvind J Trindade
- North Shore University Hospital and Hofstra Northwell School of Medicine, Division of Gastroenterolo, United States
| | - Amrita Sethi
- Columbia University Medical Center, Department of Gastroenterology, New York City, New York, United States
| | - Anne-Fré Swager
- Spaarne Gasthuis and Free University Medical Center, Amsterdam, The Netherlands
| | - Virendra Joshi
- Ochsner Clinic Foundation, Department of Gastroenterology, New Orleans, Louisiana, United States
| | - Jacques J Bergman
- Academic Medical Center, Department of Gastroenterology and Hepatology, Amsterdam, The Netherlands
| | - Hiroshi Mashimo
- Veterans Affairs Boston Healthcare System and Harvard Medical School, Department of Gastroenterology, United States
| | - Norman S Nishioka
- Massachusetts General Hospital, Gastrointestinal Unit, Boston, Massachusetts, United States
| | - Eman Namati
- NinePoint Medical, Inc., Bedford, Massachusetts, United States
| |
Collapse
|
42
|
Shu X, Beckmann L, Zhang HF. Visible-light optical coherence tomography: a review. JOURNAL OF BIOMEDICAL OPTICS 2017; 22:1-14. [PMID: 29218923 PMCID: PMC5745673 DOI: 10.1117/1.jbo.22.12.121707] [Citation(s) in RCA: 74] [Impact Index Per Article: 10.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/12/2017] [Accepted: 11/13/2017] [Indexed: 05/03/2023]
Abstract
Visible-light optical coherence tomography (vis-OCT) is an emerging imaging modality, providing new capabilities in both anatomical and functional imaging of biological tissue. It relies on visible light illumination, whereas most commercial and investigational OCTs use near-infrared light. As a result, vis-OCT requires different considerations in engineering design and implementation but brings unique potential benefits to both fundamental research and clinical care of several diseases. Here, we intend to provide a summary of the development of vis-OCT and its demonstrated applications. We also provide perspectives on future technology improvement and applications.
Collapse
Affiliation(s)
- Xiao Shu
- Northwestern University, Department of Biomedical Engineering, Evanston, Illinois, United States
| | - Lisa Beckmann
- Northwestern University, Department of Biomedical Engineering, Evanston, Illinois, United States
| | - Hao F. Zhang
- Northwestern University, Department of Biomedical Engineering, Evanston, Illinois, United States
- Northwestern University, Department of Ophthalmology, Chicago, Illinois, United States
- Address all correspondence to: Hao F. Zhang, E-mail:
| |
Collapse
|
43
|
Galvan A, Stauffer WR, Acker L, El-Shamayleh Y, Inoue KI, Ohayon S, Schmid MC. Nonhuman Primate Optogenetics: Recent Advances and Future Directions. J Neurosci 2017; 37:10894-10903. [PMID: 29118219 PMCID: PMC5678022 DOI: 10.1523/jneurosci.1839-17.2017] [Citation(s) in RCA: 79] [Impact Index Per Article: 11.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/07/2017] [Revised: 09/29/2017] [Accepted: 10/02/2017] [Indexed: 12/19/2022] Open
Abstract
Optogenetics is the use of genetically coded, light-gated ion channels or pumps (opsins) for millisecond resolution control of neural activity. By targeting opsin expression to specific cell types and neuronal pathways, optogenetics can expand our understanding of the neural basis of normal and pathological behavior. To maximize the potential of optogenetics to study human cognition and behavior, optogenetics should be applied to the study of nonhuman primates (NHPs). The homology between NHPs and humans makes these animals the best experimental model for understanding human brain function and dysfunction. Moreover, for genetic tools to have translational promise, their use must be demonstrated effectively in large, wild-type animals such as Rhesus macaques. Here, we review recent advances in primate optogenetics. We highlight the technical hurdles that have been cleared, challenges that remain, and summarize how optogenetic experiments are expanding our understanding of primate brain function.
Collapse
Affiliation(s)
- Adriana Galvan
- Yerkes National Primate Research Center and Department of Neurology, School of Medicine, Emory University, Atlanta, Georgia 30329,
| | - William R Stauffer
- Department of Neurobiology, University of Pittsburgh, Pittsburgh, Pennsylvania 15261
| | - Leah Acker
- Department of Anesthesiology, Duke University Medical Center, Durham, North Carolina 27710
| | - Yasmine El-Shamayleh
- Department of Physiology and Biophysics, Washington National Primate Research Center, University of Washington, Seattle, Washington 98195
| | - Ken-Ichi Inoue
- Department of Neuroscience, Primate Research Institute, Kyoto University, Inuyama, Aichi 484-8506, Japan
- PRESTO, Japan Science and Technology Agency, Kawaguchi, Saitama 332-0012, Japan
| | - Shay Ohayon
- McGovern Institute for Brain Research, Brain and Cognitive Sciences, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, and
| | - Michael C Schmid
- Institute of Neuroscience, Newcastle University, Newcastle, United Kingdom NE2 4HH
| |
Collapse
|
44
|
Wang Z, Yu X, Li YV. Zinc chelation promotes streptokinase-induced thrombolysis in vitro. INTERNATIONAL JOURNAL OF PHYSIOLOGY, PATHOPHYSIOLOGY AND PHARMACOLOGY 2017; 9:137-146. [PMID: 29209450 PMCID: PMC5698690] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Subscribe] [Scholar Register] [Received: 08/25/2017] [Accepted: 10/16/2017] [Indexed: 06/07/2023]
Abstract
Cardiovascular disorder occurs when a local blood clot obstructs an artery or a vein to its surround organs, causing related tissues to lose function and die. It is one of the leading causes of mortality and a major cause of disability. The effect of thrombolysis induced by injecting intravenous thrombolytic agents is critical for reducing tissue damages. Streptokinase (SK) is a widely used thrombolytic agent in the treatment of thromboembolism in the blood vessels. A high unit of streptokinase is used in thrombolytic therapies for thrombotic disorders and could improve tissue reperfusion. It is a potent plasminogen activator. However, safety concerns for the usage of a high unit of streptokinase have been raised for the hemorrhagic transformation. In the present study, we studied how zinc would affect streptokinase-induced thrombolysis in vitro, and proposed a strategy to improve streptokinase's effectiveness in promoting thrombolysis. The mice whole blood was used to form the blood clot in vitro by incubating with calcium at 37°C for 30 minutes. Streptokinase was used for inducing thrombolysis measured with the spectrophotometer. Zinc and its chelator, Ca-EDTA, were applied with streptokinase, respectively. Results showed that the co-application zinc inhibited the thrombolytic effect of streptokinase in a dose-dependent manner. Zinc chelator, Ca-EDTA, significantly increased the effect of streptokinase-induced thrombolysis. Our results suggest that zinc chelation improved the efficiency of streptokinase in thrombolysis. The results may have a significant clinical implication by potentially reducing the adverse effect of streptokinase application.
Collapse
Affiliation(s)
- Zihui Wang
- Department of Biological Sciences, Ohio UniversityAthens Ohio, USA
- Department of Biomedical Sciences, Heritage College of Osteopathic Medicine, Ohio UniversityAthens Ohio, USA
| | - Xinge Yu
- Department of Biological Sciences, Ohio UniversityAthens Ohio, USA
- Department of Biomedical Sciences, Heritage College of Osteopathic Medicine, Ohio UniversityAthens Ohio, USA
| | - Yang V Li
- Department of Biomedical Sciences, Heritage College of Osteopathic Medicine, Ohio UniversityAthens Ohio, USA
| |
Collapse
|
45
|
Allen WE, Kauvar IV, Chen MZ, Richman EB, Yang SJ, Chan K, Gradinaru V, Deverman BE, Luo L, Deisseroth K. Global Representations of Goal-Directed Behavior in Distinct Cell Types of Mouse Neocortex. Neuron 2017; 94:891-907.e6. [PMID: 28521139 PMCID: PMC5723385 DOI: 10.1016/j.neuron.2017.04.017] [Citation(s) in RCA: 216] [Impact Index Per Article: 30.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/17/2016] [Revised: 01/26/2017] [Accepted: 04/11/2017] [Indexed: 11/27/2022]
Abstract
The successful planning and execution of adaptive behaviors in mammals may require long-range coordination of neural networks throughout cerebral cortex. The neuronal implementation of signals that could orchestrate cortex-wide activity remains unclear. Here, we develop and apply methods for cortex-wide Ca2+ imaging in mice performing decision-making behavior and identify a global cortical representation of task engagement encoded in the activity dynamics of both single cells and superficial neuropil distributed across the majority of dorsal cortex. The activity of multiple molecularly defined cell types was found to reflect this representation with type-specific dynamics. Focal optogenetic inhibition tiled across cortex revealed a crucial role for frontal cortex in triggering this cortex-wide phenomenon; local inhibition of this region blocked both the cortex-wide response to task-initiating cues and the voluntary behavior. These findings reveal cell-type-specific processes in cortex for globally representing goal-directed behavior and identify a major cortical node that gates the global broadcast of task-related information.
Collapse
Affiliation(s)
- William E Allen
- Neurosciences Graduate Program, Stanford University, Stanford, CA 94305, USA; Department of Biology, Stanford University, Stanford, CA 94305, USA; Department of Bioengineering, Stanford University, Stanford, CA 94305, USA
| | - Isaac V Kauvar
- Electrical Engineering Graduate Program, Stanford University, Stanford, CA 94305, USA; Department of Bioengineering, Stanford University, Stanford, CA 94305, USA
| | - Michael Z Chen
- Department of Bioengineering, Stanford University, Stanford, CA 94305, USA
| | - Ethan B Richman
- Neurosciences Graduate Program, Stanford University, Stanford, CA 94305, USA; Department of Biology, Stanford University, Stanford, CA 94305, USA; Department of Bioengineering, Stanford University, Stanford, CA 94305, USA
| | - Samuel J Yang
- Electrical Engineering Graduate Program, Stanford University, Stanford, CA 94305, USA; Department of Bioengineering, Stanford University, Stanford, CA 94305, USA
| | - Ken Chan
- Division of Biology and Bioengineering, California Institute of Technology, Pasadena, CA 91125, USA
| | - Viviana Gradinaru
- Division of Biology and Bioengineering, California Institute of Technology, Pasadena, CA 91125, USA
| | - Benjamin E Deverman
- Division of Biology and Bioengineering, California Institute of Technology, Pasadena, CA 91125, USA
| | - Liqun Luo
- Department of Biology, Stanford University, Stanford, CA 94305, USA; Howard Hughes Medical Institute, Stanford University, Stanford, CA 94305, USA.
| | - Karl Deisseroth
- Department of Bioengineering, Stanford University, Stanford, CA 94305, USA; Howard Hughes Medical Institute, Stanford University, Stanford, CA 94305, USA; Department of Psychiatry and Behavioral Sciences, Stanford University, Stanford, CA 94305, USA.
| |
Collapse
|
46
|
Liu Q, Chen S, Soetikno B, Liu W, Tong S, Zhang HF. Monitoring Acute Stroke in Mouse Model Using Laser Speckle Imaging-Guided Visible-Light Optical Coherence Tomography. IEEE Trans Biomed Eng 2017; 65:2136-2142. [PMID: 28541195 DOI: 10.1109/tbme.2017.2706976] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Abstract
OBJECTIVE Monitoring hemodynamic and vascular changes in the acute stages of mouse stroke models is invaluable in studying ischemic stroke pathophysiology. However, there lacks a tool to simultaneously and dynamically investigate these changes. METHODS We integrated laser speckle imaging (LSI) and visible-light optical coherence tomography (Vis-OCT) to reveal dynamic vascular responses in acute stages in the distal middle cerebral artery occlusion (dMCAO) model in rodents. LSI provides full-field, real-time imaging to guide Vis-OCT imaging and monitor the dynamic cerebral blood flow (CBF). Vis-OCT offers depth-resolved angiography and oxygen saturation (sO2) measurements. RESULTS Our results showed detailed CBF and vasculature changes before, during, and after dMCAO. After dMCAO, we observed insignificant sO2 variation in arteries and arterioles and location-dependent sO2 drop in veins and venules. We observed that higher branch-order veins had larger drops in sO2 at the reperfusion stage after dMCAO. CONCLUSION This work suggests that integrated LSI and Vis-OCT is a promising tool for investigating ischemic stroke in mouse models. SIGNIFICANCE For the first time, LSI and Vis-OCT are integrated to investigate ischemic strokes in rodent models.
Collapse
|
47
|
Affiliation(s)
- Lewis. E. MacKenzie
- School of Biomedical Sciences, University of Leeds, Garstang Building Leeds, Leeds, UK
| | - Andy. R. Harvey
- School of Physics and Astronomy, Kelvin Building University of Glasgow University Avenue, Glasgow, UK
| | | |
Collapse
|
48
|
Abstract
Optogenetic methods have been highly effective for suppressing neural activity and modulating behavior in rodents, but effects have been much smaller in primates, which have much larger brains. Here, we present a suite of technologies to use optogenetics effectively in primates and apply these tools to a classic question in oculomotor control. First, we measured light absorption and heat propagation in vivo, optimized the conditions for using the red-light-shifted halorhodopsin Jaws in primates, and developed a large-volume illuminator to maximize light delivery with minimal heating and tissue displacement. Together, these advances allowed for nearly universal neuronal inactivation across more than 10 mm3 of the cortex. Using these tools, we demonstrated large behavioral changes (i.e., up to several fold increases in error rate) with relatively low light power densities (≤100 mW/mm2) in the frontal eye field (FEF). Pharmacological inactivation studies have shown that the FEF is critical for executing saccades to remembered locations. FEF neurons increase their firing rate during the three epochs of the memory-guided saccade task: visual stimulus presentation, the delay interval, and motor preparation. It is unclear from earlier work, however, whether FEF activity during each epoch is necessary for memory-guided saccade execution. By harnessing the temporal specificity of optogenetics, we found that FEF contributes to memory-guided eye movements during every epoch of the memory-guided saccade task (the visual, delay, and motor periods).
Collapse
|
49
|
Chen S, Liu Q, Shu X, Soetikno B, Tong S, Zhang HF. Imaging hemodynamic response after ischemic stroke in mouse cortex using visible-light optical coherence tomography. BIOMEDICAL OPTICS EXPRESS 2016; 7:3377-3389. [PMID: 27699105 PMCID: PMC5030017 DOI: 10.1364/boe.7.003377] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/24/2016] [Revised: 07/23/2016] [Accepted: 08/03/2016] [Indexed: 05/18/2023]
Abstract
Visible-light optical coherence tomography (Vis-OCT) is an emerging technology that can image hemodynamic response in microvasculature. Vis-OCT can retrieve blood oxygen saturation (sO2) mapping using intrinsic optical absorption contrast while providing high-resolution anatomical vascular structures at the same time. To improve the accuracy of Vis-OCT oximetry on vessels embedded in highly scattering medium, i.e., brain cortex, we developed and formulated a novel dual-depth sampling and normalization strategy that allowed us to minimize the detrimental effect of ubiquitous tissue scattering. We applied our newly developed approach to monitor the hemodynamic response in mouse cortex after focal photothrombosis. We observed vessel dilatation, which was negatively correlated with the original vessel diameter, in the penumbra region. The sO2 of vessels in the penumbra region also dropped below normal range after focal ischemia.
Collapse
Affiliation(s)
- Siyu Chen
- Department of Biomedical Engineering, Northwestern University, Evanston, IL 60208, USA
- Both authors contributed equally to this work
| | - Qi Liu
- Department of Biomedical Engineering, Northwestern University, Evanston, IL 60208, USA
- School of Biomedical Engineering, Shanghai Jiao Tong University, Shanghai, China
- Both authors contributed equally to this work
| | - Xiao Shu
- Department of Biomedical Engineering, Northwestern University, Evanston, IL 60208, USA
| | - Brian Soetikno
- Department of Biomedical Engineering, Northwestern University, Evanston, IL 60208, USA
| | - Shanbao Tong
- School of Biomedical Engineering, Shanghai Jiao Tong University, Shanghai, China
| | - Hao F. Zhang
- Department of Biomedical Engineering, Northwestern University, Evanston, IL 60208, USA
| |
Collapse
|
50
|
Tsai HI, Chung PCH, Lee CW, Yu HP. Cerebral perfusion monitoring in acute care surgery: current and perspective use. Expert Rev Med Devices 2016; 13:865-75. [DOI: 10.1080/17434440.2016.1219655] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
|