1
|
Zhang H, Ai Y, Zhang X, Deng F, Jiang S, Xie S, Peng M, Chen W, Hu J, Deng S, Zhang L. Visualization of Blood-Brain Barrier Disruption in Septic Mice with the New Method Based on in Vivo Imaging Technology. Neurocrit Care 2024:10.1007/s12028-024-02018-x. [PMID: 38982003 DOI: 10.1007/s12028-024-02018-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/02/2024] [Accepted: 05/16/2024] [Indexed: 07/11/2024]
Abstract
BACKGROUND Dynamic monitoring of the blood-brain barrier (BBB) functional status in septic mice can help to explore the pathological mechanisms. Therefore, we proposed a new method for monitoring BBB permeability and applied it to the detection of sepsis models. METHODS The new method involves the construction of an optical cranial window and in vivo imaging. We performed dynamic monitoring of BBB permeability and cerebral blood flow (CBF) in cecal ligation puncture (CLP) and endotoxemia (lipopolysaccharide [LPS]) mice. RESULTS The sensitivity and accuracy of this method were higher than those of Evans blue evaluation. The increase of BBB permeability in the group of CLP mice was relatively mild and correlated with overall survival, and the damage was irreversible. Contrarily, BBB damage in the LPS group was more acute and severe, unrelated to overall survival, but recoverable. The CBF decreased significantly in both model mouse groups 24 h after modeling, but only the CBF proportion decrease in the LPS group was significantly correlated with an increase in BBB permeability. Within 24 h after both models were established, the decrease in blood flow in the digestive organs occurred earlier than in the brain and kidneys, and the decrease in small intestine blood flow in the LPS group progressed faster. CONCLUSIONS We have successfully demonstrated the feasibility of our novel method to detect BBB permeability in mice. Our results revealed a significant difference in the BBB permeability change trend between the CLP and LPS model mice when survival curves were consistent. Notably, the CLP-model mice demonstrated a closer resemblance to clinical patients. Our findings suggest that early-stage brain tissue hypoperfusion has a greater impact on BBB function damage in endotoxemia mice, which is related to the faster progression of blood flow redistribution.
Collapse
Affiliation(s)
- Haisong Zhang
- Department of Critical Care Medicine, Xiangya Hospital, Central South University, Changsha, 410008, China
| | - Yuhang Ai
- Department of Critical Care Medicine, Xiangya Hospital, Central South University, Changsha, 410008, China
| | - Xiaolei Zhang
- Department of Critical Care Medicine, Xiangya Hospital, Central South University, Changsha, 410008, China
| | - Fuxing Deng
- Department of Critical Care Medicine, Xiangya Hospital, Central South University, Changsha, 410008, China
| | - Shiwei Jiang
- Department of Critical Care Medicine, Xiangya Hospital, Central South University, Changsha, 410008, China
| | - Shucai Xie
- Department of Critical Care Medicine, Xiangya Hospital, Central South University, Changsha, 410008, China
| | - Milin Peng
- Department of Critical Care Medicine, Xiangya Hospital, Central South University, Changsha, 410008, China
| | - Wei Chen
- Department of Critical Care Medicine, Xiangya Hospital, Central South University, Changsha, 410008, China
| | - Jiyun Hu
- Department of Critical Care Medicine, Xiangya Hospital, Central South University, Changsha, 410008, China
| | - Songyun Deng
- Department of Critical Care Medicine, Xiangya Hospital, Central South University, Changsha, 410008, China
| | - Lina Zhang
- Department of Critical Care Medicine, Xiangya Hospital, Central South University, Changsha, 410008, China.
| |
Collapse
|
2
|
Liu J, Xu H, Gao S, Liu L, Qu J, Ohulchanskyy TY. Combining near infrared fluorescence and laser speckle imaging with optical tissue clearing for in vivo transcranial monitoring of cerebral blood vessels damaged by photodynamic nanoformulation. BIOMEDICAL OPTICS EXPRESS 2024; 15:924-937. [PMID: 38404313 PMCID: PMC10890862 DOI: 10.1364/boe.513820] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 11/20/2023] [Revised: 01/08/2024] [Accepted: 01/08/2024] [Indexed: 02/27/2024]
Abstract
In vivo near infrared (NIR) fluorescence imaging and laser speckle contrast imaging (LSCI) are emerging optical bioimaging modalities, which can provide information on blood vessels morphology, volume and the blood flow velocity. Optical tissue clearing (OTC) technique addresses a light scattering problem in optical bioimaging, which is imperative for the transcranial brain imaging. Herein, we report an approach combining NIR fluorescence and LSC microscopy imaging with OTC. A liposomal nanoformulation comprising NIR fluorescent dye ICG and photosensitizer BPD was synthesized and injected intravenously into mouse with OTC treated skull. Transcranial excitation of BPD in nanoliposomes resulted in the localized, irradiation dose dependent photodynamic damage of the brain blood vessels, which was manifested both in NIR fluorescence and LSC transcranial imaging, revealing changes in the vessels morphology, volume and the blood flow rate. The developed approach allows for bimodal imaging guided, localized vascular PDT of cancer and other diseases.
Collapse
Affiliation(s)
- Jiantao Liu
- Key Laboratory of Optoelectronic Devices
and Systems of Ministry of Education and Guangdong Province, College
of Physics and Optoelectronic Engineering, Shenzhen University, Shenzhen, Guangdong, China
| | - Hao Xu
- Key Laboratory of Optoelectronic Devices
and Systems of Ministry of Education and Guangdong Province, College
of Physics and Optoelectronic Engineering, Shenzhen University, Shenzhen, Guangdong, China
| | - Siqi Gao
- Key Laboratory of Optoelectronic Devices
and Systems of Ministry of Education and Guangdong Province, College
of Physics and Optoelectronic Engineering, Shenzhen University, Shenzhen, Guangdong, China
| | - Liwei Liu
- Key Laboratory of Optoelectronic Devices
and Systems of Ministry of Education and Guangdong Province, College
of Physics and Optoelectronic Engineering, Shenzhen University, Shenzhen, Guangdong, China
| | - Junle Qu
- Key Laboratory of Optoelectronic Devices
and Systems of Ministry of Education and Guangdong Province, College
of Physics and Optoelectronic Engineering, Shenzhen University, Shenzhen, Guangdong, China
- Engineering Research Center of Optical
Instrument and System, Ministry of Education, Shanghai Key Lab of
Modern Optical System, School of Optical-Electrical and Computer
Engineering, University of Shanghai for Science and
Technology, Shanghai, China
| | - Tymish Y. Ohulchanskyy
- Key Laboratory of Optoelectronic Devices
and Systems of Ministry of Education and Guangdong Province, College
of Physics and Optoelectronic Engineering, Shenzhen University, Shenzhen, Guangdong, China
| |
Collapse
|
3
|
Wang Y, Zhang R, Chen Q, Guo H, Liang X, Li T, Qi W, Xi L. Visualization of blood-brain barrier disruption with dual-wavelength high-resolution photoacoustic microscopy. BIOMEDICAL OPTICS EXPRESS 2022; 13:1537-1550. [PMID: 35415000 PMCID: PMC8973185 DOI: 10.1364/boe.449017] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/18/2021] [Revised: 01/15/2022] [Accepted: 02/01/2022] [Indexed: 06/14/2023]
Abstract
The blood-brain barrier (BBB) strictly regulates the substance exchange between the vascular network and the central nervous system, and plays a critical role in maintaining normal brain homeostasis. Impaired BBB is often accompanied with the emergence of cerebral diseases and probably further leads to severe neuroinflammation or even neurological degeneration. Hence, there is an urgent need to precisely monitor the impaired BBB to understand its pathogenesis and better guide the enactment of therapeutic strategies. However, there is a lack of high-resolution imaging techniques to visualize and evaluate the large-scale BBB disruption in pre-clinical and clinical aspects. In this study, we propose a dual-wavelength photoacoustic imaging (PAI) methodology that simultaneously reveals the abnormal microvasculature and impaired BBB within the cerebral cortex. In in vivo studies, BBB disruption in both mice and rats were induced by local hot-water stimulation and unilateral carotid arterial perfusion of hyperosmolar mannitol, respectively. Subsequently, the exogenous contrast agent (CA) was injected into the microcirculation via the tail vein, and photoacoustic (PA) images of the microvasculature and leaked CA within the cerebral cortex were obtained by dual-wavelength photoacoustic microscopy to evaluate the BBB disruption. Besides, analysis of distribution and concentration of leaked CA in lesion region was further conducted to quantitatively reveal the dynamic changes of BBB permeability. Furthermore, we exploited this approach to investigate the reversibility of BBB disruption within the two distinct models. Based on the experimental results, this new proposed approach presents excellent performance in visualizing microvasculature and leaked CA, and enabling it possesses great potential in evaluating the abnormal microvasculature and impaired BBB result from cerebrovascular diseases.
Collapse
Affiliation(s)
- Yongchao Wang
- Department of Biomedical Engineering, Southern University of Science and Technology, Shenzhen, Guangdong, 518055, China
- These authors contributed equally to this study
| | - Ruoxi Zhang
- Department of Biomedical Engineering, Southern University of Science and Technology, Shenzhen, Guangdong, 518055, China
- These authors contributed equally to this study
| | - Qian Chen
- Department of Biomedical Engineering, Southern University of Science and Technology, Shenzhen, Guangdong, 518055, China
| | - Heng Guo
- Department of Biomedical Engineering, Southern University of Science and Technology, Shenzhen, Guangdong, 518055, China
| | - Xiao Liang
- Department of Biomedical Engineering, Southern University of Science and Technology, Shenzhen, Guangdong, 518055, China
| | - Tingting Li
- Department of Biomedical Engineering, Southern University of Science and Technology, Shenzhen, Guangdong, 518055, China
| | - Weizhi Qi
- Department of Biomedical Engineering, Southern University of Science and Technology, Shenzhen, Guangdong, 518055, China
- Shenzhen Bay Laboratory, Shenzhen, 518132, China
| | - Lei Xi
- Department of Biomedical Engineering, Southern University of Science and Technology, Shenzhen, Guangdong, 518055, China
| |
Collapse
|
4
|
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
|
5
|
Wang M, Wu N, Huang H, Luo J, Lan G, Zeng Y, Wang X, Xiong H, Han D, Tan H. Large-depth-of-field full-field optical angiography. JOURNAL OF BIOPHOTONICS 2019; 12:e201800329. [PMID: 30315638 DOI: 10.1002/jbio.201800329] [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: 08/29/2018] [Revised: 10/11/2018] [Accepted: 10/11/2018] [Indexed: 06/08/2023]
Abstract
A large-depth-of-field full-field optical angiography (LD-FFOA) method is developed to expand the depth-of-field (DOF) using a contrast pyramid fusion algorithm (CPFA). The absorption intensity fluctuation modulation effect is utilized to obtain full-field optical angiography (FFOA) images at different focus positions. The CPFA is used to process these FFOA images with different focuses. By selecting high-contrast areas, the CPFA can highlight the characteristics and details of blood vessels to obtain LD-FFOA images. In the optimal case of the proposed method, the DOF for FFOA is more than tripled using 10 differently focused FFOA images. Both the phantom and animal experimental results show that the LD-FFOA resolves FFOA defocusing issues induced by surface and thickness inhomogeneities in biological samples. The proposed method can be potentially applied to practical biological experiments.
Collapse
Affiliation(s)
- Mingyi Wang
- School of Physics and Optoelectronic Engineering, Foshan University, Guangdong, China
| | - Nanshou Wu
- School of Physics and Optoelectronic Engineering, Foshan University, Guangdong, China
| | - Hongheng Huang
- School of Physics and Optoelectronic Engineering, Foshan University, Guangdong, China
| | - Jiaxiong Luo
- School of Physics and Optoelectronic Engineering, Foshan University, Guangdong, China
| | - Gongpu Lan
- School of Physics and Optoelectronic Engineering, Foshan University, Guangdong, China
| | - Yaguang Zeng
- School of Physics and Optoelectronic Engineering, Foshan University, Guangdong, China
| | - Xuehua Wang
- School of Physics and Optoelectronic Engineering, Foshan University, Guangdong, China
| | - Honglian Xiong
- School of Physics and Optoelectronic Engineering, Foshan University, Guangdong, China
| | - Dingan Han
- School of Physics and Optoelectronic Engineering, Foshan University, Guangdong, China
| | - Haishu Tan
- School of Physics and Optoelectronic Engineering, Foshan University, Guangdong, China
| |
Collapse
|
6
|
Feng W, Zhang C, Yu T, Semyachkina-Glushkovskaya O, Zhu D. In vivo monitoring blood-brain barrier permeability using spectral imaging through optical clearing skull window. JOURNAL OF BIOPHOTONICS 2019; 12:e201800330. [PMID: 30485699 DOI: 10.1002/jbio.201800330] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/29/2018] [Revised: 11/18/2018] [Accepted: 11/25/2018] [Indexed: 05/21/2023]
Abstract
The blood-brain barrier (BBB) plays a key role in the health of the central nervous system. Opening the BBB is very important for drug delivery to brain tissues to enhance the therapeutic effect on brain diseases. It is necessary to in vivo monitor the BBB permeability for assessing drug release with high resolution; however, an effective method is lacking. In this work, we developed a new method that combined spectral imaging with an optical clearing skull window to in vivo dynamically monitor BBB opening caused by 5-aminolevulinic acid (5-ALA)-mediated photodynamic therapy (PDT), in which the Evans blue dye (EBd) acted as an indicator of the BBB permeability. Using this method, we effectively monitored the cerebrovascular EBd leakage process. Moreover, the analysis of changes in the vascular and extravascular EBd concentrations demonstrated that the PDT-induced BBB opening exhibited spatiotemporal differences in the cortex. This spectral imaging method based on the optical clearing skull window provides a low-cost and simply operated tool for in vivo monitoring BBB opening process. This has a high potential for the visualization of drug delivery to the central nervous system. Thus, it is of tremendous significance in brain disease therapy. Monitoring the changes in PDT-induced BBB permeability by evaluating the EBd concentration using an optical clearing skull window. (A) Entire brains and coronal sections following treatment of PDT with/without an optical clearing skull window after injection of EBd. (B) Typical EBd distribution maps before and after laser irradiation captured by the spectral imaging method. (Colorbar represents the EBd concentration).
Collapse
Affiliation(s)
- Wei Feng
- Britton Chance Center for Biomedical Photonics, Wuhan National Laboratory for Optoelectronics-Huazhong University of Science and Technology, Wuhan, Hubei, China
- MOE Key Laboratory for Biomedical Photonics, Collaborative Innovation Center for Biomedical Engineering, School of Engineering Sciences, Huazhong University of Science and Technology, Wuhan, Hubei, China
| | - Chao Zhang
- Britton Chance Center for Biomedical Photonics, Wuhan National Laboratory for Optoelectronics-Huazhong University of Science and Technology, Wuhan, Hubei, China
- MOE Key Laboratory for Biomedical Photonics, Collaborative Innovation Center for Biomedical Engineering, School of Engineering Sciences, Huazhong University of Science and Technology, Wuhan, Hubei, China
| | - Tingting Yu
- Britton Chance Center for Biomedical Photonics, Wuhan National Laboratory for Optoelectronics-Huazhong University of Science and Technology, Wuhan, Hubei, China
- MOE Key Laboratory for Biomedical Photonics, Collaborative Innovation Center for Biomedical Engineering, School of Engineering Sciences, Huazhong University of Science and Technology, Wuhan, Hubei, China
| | | | - Dan Zhu
- Britton Chance Center for Biomedical Photonics, Wuhan National Laboratory for Optoelectronics-Huazhong University of Science and Technology, Wuhan, Hubei, China
- MOE Key Laboratory for Biomedical Photonics, Collaborative Innovation Center for Biomedical Engineering, School of Engineering Sciences, Huazhong University of Science and Technology, Wuhan, Hubei, China
| |
Collapse
|
7
|
Ansson CD, Sheikh R, Dahlstrand U, Hult J, Lindstedt S, Malmsjö M. Blood perfusion in Hewes tarsoconjunctival flaps in pigs measured by laser speckle contrast imaging. JPRAS Open 2018; 18:98-103. [PMID: 32158843 PMCID: PMC7061646 DOI: 10.1016/j.jpra.2018.07.001] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/14/2018] [Revised: 06/05/2018] [Accepted: 07/18/2018] [Indexed: 10/31/2022] Open
Abstract
Background Hewes flap is a tarsoconjunctival eyelid flap, based at the lateral canthal tendon, and rotated and stretched to repair lateral defects in the lower eyelid commonly following tumor surgery. The aim of the present study was to monitor perfusion in a Hewes flap during reconstruction, which to the best of our knowledge, has not previously been done. Methods A Hewes tarsoconjunctival eyelid flap was raised and the effects on blood perfusion of rotating the flaps by 90° and 180°, stretching the flaps with a force of 5 or 10 N, and repeated diathermic coagulation was monitored with laser speckle contrast imaging. Results Rotating the flaps by 90° did not significantly affect perfusion, while further rotation to 180° reduced blood perfusion to 75% of the baseline value. When the tarsoconjunctival flaps were both rotated 90° and stretched with 5 N, the perfusion was reduced even further, to 63%. A further reduction in perfusion, to 36%, was seen when the higher force of 10 N was applied. Diathermy decreased blood perfusion to 56% after being applied once. Successive applications led to further decreases: 43%, 31%, and 15%, after the second, third and fourth applications. Conclusions Perfusion in Hewes tarsoconjunctival flaps is affected by both rotation and stretching, but some perfusion is maintained despite these manipulations. Diathermy, however, has detrimental effects and should be avoided.
Collapse
Affiliation(s)
- Cu Dinh Ansson
- Department of Clinical Sciences Lund, Skåne University Hospital, Lund University, Ögonklinik A, Kioskgatan 1B, SE-221 85 Lund, Sweden
| | - Rafi Sheikh
- Department of Clinical Sciences Lund, Skåne University Hospital, Lund University, Ögonklinik A, Kioskgatan 1B, SE-221 85 Lund, Sweden
| | - Ulf Dahlstrand
- Department of Clinical Sciences Lund, Skåne University Hospital, Lund University, Ögonklinik A, Kioskgatan 1B, SE-221 85 Lund, Sweden
| | - Jenny Hult
- Department of Clinical Sciences Lund, Skåne University Hospital, Lund University, Ögonklinik A, Kioskgatan 1B, SE-221 85 Lund, Sweden
| | - Sandra Lindstedt
- Lund University, Skåne University Hospital, Department of Clinical Sciences Lund, Cardiothoracic Surgery, Lund, Sweden
| | - Malin Malmsjö
- Department of Clinical Sciences Lund, Skåne University Hospital, Lund University, Ögonklinik A, Kioskgatan 1B, SE-221 85 Lund, Sweden
| |
Collapse
|
8
|
Shityakov S, Förster CY. Computational simulation and modeling of the blood-brain barrier pathology. Histochem Cell Biol 2018; 149:451-459. [PMID: 29721642 DOI: 10.1007/s00418-018-1665-x] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 03/30/2018] [Indexed: 10/17/2022]
Abstract
In silico methods and models in the pathology of the blood-brain barrier (BBB) or also called BBB "computational pathology", are based on using mathematical approaches together with complex, high-dimensional experimental data to evaluate and predict disease-related impacts on the CNS. These computational methods and tools have been designed to deal with BBB-linked neuropathology at the molecular, cellular, tissue, and organ levels. The molecular and cellular levels mainly include molecular docking and molecular dynamics simulations (atomistic and coarse-grain) of mutated or misfolded tight junction proteins, receptors, and various BBB transporters. The tissue and organ levels encompass the mechanistic and pharmacokinetic models as well as finite-element method and pathway analyses enriched with multiple sources of raw data (e.g., in vitro and in vivo, histopathological records, "-omics", and imaging data). Overall, this review discusses comprehensive computational techniques and strategies at different levels of complexity, providing new insights and future directions for diagnosis, treatment improvement, and a deeper understanding of BBB-related neuropathological events.
Collapse
Affiliation(s)
- Sergey Shityakov
- Department of Anesthesia and Critical Care, University of Würzburg, 97080, Würzburg, Germany.
| | - Carola Y Förster
- Department of Anesthesia and Critical Care, University of Würzburg, 97080, Würzburg, Germany.
| |
Collapse
|
9
|
Ringuette D, Jeffrey MA, Dufour S, Carlen PL, Levi O. Continuous multi-modality brain imaging reveals modified neurovascular seizure response after intervention. BIOMEDICAL OPTICS EXPRESS 2017; 8:873-889. [PMID: 28270990 PMCID: PMC5330586 DOI: 10.1364/boe.8.000873] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/04/2016] [Revised: 12/05/2016] [Accepted: 12/19/2016] [Indexed: 05/28/2023]
Abstract
We developed a multi-modal brain imaging system to investigate the relationship between blood flow, blood oxygenation/volume, intracellular calcium and electrographic activity during acute seizure-like events (SLEs), both before and after pharmacological intervention. Rising blood volume was highly specific to SLE-onset whereas blood flow was more correlated with all eletrographic activity. Intracellular calcium spiked between SLEs and at SLE-onset with oscillation during SLEs. Modified neurovascular and ionic SLE responses were observed after intervention and the interval between SLEs became shorter and more inconsistent. Comparison of artery and vein pulsatile flow suggest proximal interference and greater vascular leakage prior to intervention.
Collapse
Affiliation(s)
- Dene Ringuette
- The Institute of Biomaterials and Biomedical Engineering, University of Toronto, 164 College Street, Toronto, Ontario, M5S 3G9,
Canada
| | - Melanie A. Jeffrey
- Division of Fundamental Neurobiology, Toronto Western Research Institute, 60 Leonard Ave, Toronto, Ontario M5T 2R1,
Canada
| | - Suzie Dufour
- The Institute of Biomaterials and Biomedical Engineering, University of Toronto, 164 College Street, Toronto, Ontario, M5S 3G9,
Canada
- Division of Fundamental Neurobiology, Toronto Western Research Institute, 60 Leonard Ave, Toronto, Ontario M5T 2R1,
Canada
| | - Peter L. Carlen
- The Institute of Biomaterials and Biomedical Engineering, University of Toronto, 164 College Street, Toronto, Ontario, M5S 3G9,
Canada
- Division of Fundamental Neurobiology, Toronto Western Research Institute, 60 Leonard Ave, Toronto, Ontario M5T 2R1,
Canada
| | - Ofer Levi
- The Institute of Biomaterials and Biomedical Engineering, University of Toronto, 164 College Street, Toronto, Ontario, M5S 3G9,
Canada
- The Edward S. Rogers Sr. Department of Electrical and Computer Engineering, University of Toronto, 10 King’s College Road, Toronto, Ontario, M5S 3G4,
Canada
| |
Collapse
|
10
|
Borges JP, Lopes GO, Verri V, Coelho MP, Nascimento PMC, Kopiler DA, Tibirica E. A novel effective method for the assessment of microvascular function in male patients with coronary artery disease: a pilot study using laser speckle contrast imaging. ACTA ACUST UNITED AC 2016; 49:e5541. [PMID: 27599202 PMCID: PMC5018692 DOI: 10.1590/1414-431x20165541] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/03/2016] [Accepted: 07/07/2016] [Indexed: 11/23/2022]
Abstract
Evaluation of microvascular endothelial function is essential for investigating the pathophysiology and treatment of cardiovascular and metabolic diseases. Although laser speckle contrast imaging technology is well accepted as a noninvasive methodology for assessing microvascular endothelial function, it has never been used to compare male patients with coronary artery disease with male age-matched healthy controls. Thus, the aim of this study was to determine whether laser speckle contrast imaging could be used to detect differences in the systemic microvascular functions of patients with established cardiovascular disease (n=61) and healthy age-matched subjects (n=24). Cutaneous blood flow was assessed in the skin of the forearm using laser speckle contrast imaging coupled with the transdermal iontophoretic delivery of acetylcholine and post-occlusive reactive hyperemia. The maximum increase in skin blood flow induced by acetylcholine was significantly reduced in the cardiovascular disease patients compared with the control subjects (74 vs 116%; P<0.01). With regard to post-occlusive reactive hyperemia-induced vasodilation, the patients also presented reduced responses compared to the controls (0.42±0.15 vs 0.50±0.13 APU/mmHg; P=0.04). In conclusion, laser speckle contrast imaging can identify endothelial and microvascular dysfunctions in male individuals with cardiovascular disease. Thus, this technology appears to be an efficient non-invasive technique for evaluating systemic microvascular and endothelial functions, which could be valuable as a peripheral marker of atherothrombotic diseases in men.
Collapse
Affiliation(s)
- J P Borges
- Laboratório de Atividade Física e Promoção è Saúde, Departamento de Desporto Coletivo, Instituto de Educação Física e Desportos, Universidade do Estado do Rio de Janeiro, Rio de Janeiro, RJ, Brasil
| | - G O Lopes
- Laboratório de Atividade Física e Promoção è Saúde, Departamento de Desporto Coletivo, Instituto de Educação Física e Desportos, Universidade do Estado do Rio de Janeiro, Rio de Janeiro, RJ, Brasil.,Instituto Nacional de Cardiologia, Rio de Janeiro, RJ, Brasil
| | - V Verri
- Instituto Nacional de Cardiologia, Rio de Janeiro, RJ, Brasil
| | - M P Coelho
- Instituto Nacional de Cardiologia, Rio de Janeiro, RJ, Brasil
| | | | - D A Kopiler
- Instituto Nacional de Cardiologia, Rio de Janeiro, RJ, Brasil
| | - E Tibirica
- Instituto Nacional de Cardiologia, Rio de Janeiro, RJ, Brasil.,Laboratório de Investigação Cardiovascular, Departamento Osório de Almeida, Instituto Oswaldo Cruz, FIOCRUZ, Rio de Janeiro, RJ, Brasil
| |
Collapse
|
11
|
Wang M, Zeng Y, Dong N, Liao R, Yang G. Full-field velocity imaging of red blood cells in capillaries with spatiotemporal demodulation autocorrelation. JOURNAL OF BIOMEDICAL OPTICS 2016; 21:36007. [PMID: 26976059 DOI: 10.1117/1.jbo.21.3.036007] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/15/2015] [Accepted: 02/24/2016] [Indexed: 06/05/2023]
Abstract
We propose a full-field optical method for the label-free and quantitative mapping of the velocities of red blood cells (RBCs) in capillaries. It integrates spatiotemporal demodulation and an autocorrelation algorithm, and measures RBC velocity according to the ratio of RBC length to lag time. Conventionally, RBC length is assumed to be a constant and lag time is taken as a variable, while our method treats both of them as variables. We use temporal demodulation and the Butterworth spatial filter to separate RBC signal from background signal, based on which we obtain the RBC length by image segmentation and lag time by autocorrelation analysis. The RBC velocity calculated now is more accurate. The validity of our method is verified by an in vivo experiment on a mouse ear. Owing to its higher image signal-to-noise ratio, our method can be used for mapping RBC velocity in the turbid tissue case.
Collapse
Affiliation(s)
- Mingyi Wang
- Beijing Normal University, Department of Physics and Applied Optics, Beijing Area Major Laboratory, No. 19, XinJieKouWai Street, HaiDian District, Beijing 100875, ChinabBeijing Normal University, Key Laboratory of Theoretical and Computational Photochemis
| | - Yaguang Zeng
- Beijing Normal University, Department of Physics and Applied Optics, Beijing Area Major Laboratory, No. 19, XinJieKouWai Street, HaiDian District, Beijing 100875, ChinabBeijing Normal University, Key Laboratory of Theoretical and Computational Photochemis
| | - Nannan Dong
- Beijing Normal University, Department of Physics and Applied Optics, Beijing Area Major Laboratory, No. 19, XinJieKouWai Street, HaiDian District, Beijing 100875, ChinabBeijing Normal University, Key Laboratory of Theoretical and Computational Photochemis
| | - Riwei Liao
- South China Normal University, School of Physics and Telecommunication, Guangzhou Higher Education Mega Center, Panyu District, GuanZhou, Guangdong 510000, China
| | - Guojian Yang
- Beijing Normal University, Department of Physics and Applied Optics, Beijing Area Major Laboratory, No. 19, XinJieKouWai Street, HaiDian District, Beijing 100875, ChinabBeijing Normal University, Key Laboratory of Theoretical and Computational Photochemis
| |
Collapse
|
12
|
Optical coherence tomography-guided laser microsurgery for blood coagulation with continuous-wave laser diode. Sci Rep 2015; 5:16739. [PMID: 26568136 PMCID: PMC4645164 DOI: 10.1038/srep16739] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/26/2015] [Accepted: 10/19/2015] [Indexed: 12/18/2022] Open
Abstract
Blood coagulation is the clotting and subsequent dissolution of the clot following repair to the damaged tissue. However, inducing blood coagulation is difficult for some patients with homeostasis dysfunction or during surgery. In this study, we proposed a method to develop an integrated system that combines optical coherence tomography (OCT) and laser microsurgery for blood coagulation. Also, an algorithm for positioning of the treatment location from OCT images was developed. With OCT scanning, 2D/3D OCT images and angiography of tissue can be obtained simultaneously, enabling to noninvasively reconstruct the morphological and microvascular structures for real-time monitoring of changes in biological tissues during laser microsurgery. Instead of high-cost pulsed lasers, continuous-wave laser diodes (CW-LDs) with the central wavelengths of 450 nm and 532 nm are used for blood coagulation, corresponding to higher absorption coefficients of oxyhemoglobin and deoxyhemoglobin. Experimental results showed that the location of laser exposure can be accurately controlled with the proposed approach of imaging-based feedback positioning. Moreover, blood coagulation can be efficiently induced by CW-LDs and the coagulation process can be monitored in real-time with OCT. This technology enables to potentially provide accurate positioning for laser microsurgery and control the laser exposure to avoid extra damage by real-time OCT imaging.
Collapse
|
13
|
Kazmi SMS, Faraji E, Davis MA, Huang YY, Zhang XJ, Dunn AK. Flux or speed? Examining speckle contrast imaging of vascular flows. BIOMEDICAL OPTICS EXPRESS 2015. [PMID: 26203384 PMCID: PMC4505712 DOI: 10.1364/boe.6.002588] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/03/2023]
Abstract
Speckle contrast imaging enables rapid mapping of relative blood flow distributions using camera detection of back-scattered laser light. However, speckle derived flow measures deviate from direct measurements of erythrocyte speeds by 47 ± 15% (n = 13 mice) in vessels of various calibers. Alternatively, deviations with estimates of volumetric flux are on average 91 ± 43%. We highlight and attempt to alleviate this discrepancy by accounting for the effects of multiple dynamic scattering with speckle imaging of microfluidic channels of varying sizes and then with red blood cell (RBC) tracking correlated speckle imaging of vascular flows in the cerebral cortex. By revisiting the governing dynamic light scattering models, we test the ability to predict the degree of multiple dynamic scattering across vessels in order to correct for the observed discrepancies between relative RBC speeds and multi-exposure speckle imaging estimates of inverse correlation times. The analysis reveals that traditional speckle contrast imagery of vascular flows is neither a measure of volumetric flux nor particle speed, but rather the product of speed and vessel diameter. The corrected speckle estimates of the relative RBC speeds have an average 10 ± 3% deviation in vivo with those obtained from RBC tracking.
Collapse
Affiliation(s)
- S. M. Shams Kazmi
- The University of Texas at Austin, Department of Biomedical Engineering, 107 W. Dean Keeton C0800, Austin, Texas 78712, USA
| | - Ehssan Faraji
- The University of Texas at Austin, Department of Biomedical Engineering, 107 W. Dean Keeton C0800, Austin, Texas 78712, USA
| | - Mitchell A. Davis
- The University of Texas at Austin, Department of Biomedical Engineering, 107 W. Dean Keeton C0800, Austin, Texas 78712, USA
| | - Yu-Yen Huang
- The University of Texas at Austin, Department of Biomedical Engineering, 107 W. Dean Keeton C0800, Austin, Texas 78712, USA
- Currently with Dartmouth College, Thayer School of Engineering, 14 Engineering Drive, Hanover, New Hampshire 03755, USA
| | - Xiaojing J. Zhang
- The University of Texas at Austin, Department of Biomedical Engineering, 107 W. Dean Keeton C0800, Austin, Texas 78712, USA
- Currently with Dartmouth College, Thayer School of Engineering, 14 Engineering Drive, Hanover, New Hampshire 03755, USA
| | - Andrew K. Dunn
- The University of Texas at Austin, Department of Biomedical Engineering, 107 W. Dean Keeton C0800, Austin, Texas 78712, USA
| |
Collapse
|
14
|
Chassidim Y, Vazana U, Prager O, Veksler R, Bar-Klein G, Schoknecht K, Fassler M, Lublinsky S, Shelef I. Analyzing the blood-brain barrier: the benefits of medical imaging in research and clinical practice. Semin Cell Dev Biol 2014; 38:43-52. [PMID: 25455024 DOI: 10.1016/j.semcdb.2014.11.007] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/03/2014] [Revised: 11/23/2014] [Accepted: 11/24/2014] [Indexed: 01/03/2023]
Abstract
A dysfunctional BBB is a common feature in a variety of brain disorders, a fact stressing the need for diagnostic tools designed to assess brain vessels' permeability in space and time. Biological research has benefited over the years various means to analyze BBB integrity. The use of biomarkers for improper BBB functionality is abundant. Systemic administration of BBB impermeable tracers can both visualize brain regions characterized by BBB impairment, as well as lead to its quantification. Additionally, locating molecular, physiological content in regions from which it is restricted under normal BBB functionality undoubtedly indicates brain pathology-related BBB disruption. However, in-depth research into the BBB's phenotype demands higher analytical complexity than functional vs. pathological BBB; criteria which biomarker based BBB permeability analyses do not meet. The involvement of accurate and engineering sciences in recent brain research, has led to improvements in the field, in the form of more accurate, sensitive imaging-based methods. Improvements in the spatiotemporal resolution of many imaging modalities and in image processing techniques, make up for the inadequacies of biomarker based analyses. In pre-clinical research, imaging approaches involving invasive procedures, enable microscopic evaluation of BBB integrity, and benefit high levels of sensitivity and accuracy. However, invasive techniques may alter normal physiological function, thus generating a modality-based impact on vessel's permeability, which needs to be corrected for. Non-invasive approaches do not affect proper functionality of the inspected system, but lack in spatiotemporal resolution. Nevertheless, the benefit of medical imaging, even in pre-clinical phases, outweighs its disadvantages. The innovations in pre-clinical imaging and the development of novel processing techniques, have led to their implementation in clinical use as well. Specialized analyses of vessels' permeability add valuable information to standard anatomical inspections which do not take the latter into consideration.
Collapse
Affiliation(s)
- Yoash Chassidim
- Departments of Physiology & Cell Biology, Cognitive and Brain Sciences, The Zlotowski Center for Neuroscience, Ben-Gurion University of the Negev, Beer-Sheva, Israel
| | - Udi Vazana
- Departments of Physiology & Cell Biology, Cognitive and Brain Sciences, The Zlotowski Center for Neuroscience, Ben-Gurion University of the Negev, Beer-Sheva, Israel
| | - Ofer Prager
- Departments of Physiology & Cell Biology, Cognitive and Brain Sciences, The Zlotowski Center for Neuroscience, Ben-Gurion University of the Negev, Beer-Sheva, Israel
| | - Ronel Veksler
- Departments of Physiology & Cell Biology, Cognitive and Brain Sciences, The Zlotowski Center for Neuroscience, Ben-Gurion University of the Negev, Beer-Sheva, Israel
| | - Guy Bar-Klein
- Departments of Physiology & Cell Biology, Cognitive and Brain Sciences, The Zlotowski Center for Neuroscience, Ben-Gurion University of the Negev, Beer-Sheva, Israel
| | - Karl Schoknecht
- Department of Neurophysiology, Charite University of Medicine, Berlin, Germany
| | - Michael Fassler
- Departments of Physiology & Cell Biology, Cognitive and Brain Sciences, The Zlotowski Center for Neuroscience, Ben-Gurion University of the Negev, Beer-Sheva, Israel
| | - Svetlana Lublinsky
- Departments of Physiology & Cell Biology, Cognitive and Brain Sciences, The Zlotowski Center for Neuroscience, Ben-Gurion University of the Negev, Beer-Sheva, Israel
| | - Ilan Shelef
- Medical Imaging Institute, Soroka Medical Center, Beer-Sheva, Israel
| |
Collapse
|