1
|
Lucas A, Munoz CJ, Cabrales P. Hyperspectral Wide-Field-Of-View Imaging to Study Dynamic Microcirculatory Changes During Hypoxia. Am J Physiol Heart Circ Physiol 2022; 323:H49-H58. [PMID: 35522555 DOI: 10.1152/ajpheart.00624.2021] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
OBJECTIVE Hyperspectral imaging (HSI) provides a fast, reliable, and non-invasive way the study vascular microcirculation in animal models. Rapid hyperspectral imaging of large portions of the microcirculatory preparation is critical for understanding the function and regulation of vascular microcirculatory networks. METHODS This report presents the application of an off-the-shelf, benchtop, HSI linear scanning system to acquire larger field-of-view images of microcirculatory preparations. The HSI line detector was displaced perpendicular to the scanning direction to map larger areas, with a rate of displacement determined by the scanning rate and the exposure time. The collected image was analyzed to determine dynamic changes in the microcirculation. RESULTS The system records dynamic changes in microvascular hemoglobin (Hb) oxygen (O2) saturation and vascular morphology during hypoxia and reoxygenation and has similar acquisition speeds to commonly referenced spectral-scanning HSI systems. Additionally, the HbO2 saturations collected via HSI closely correlate with those collected by phosphorescence quenching microscopy. CONCLUSION The reported system enables dynamic functional microcirculation imaging for broad experimental and clinical applications.
Collapse
Affiliation(s)
- Alfredo Lucas
- Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA, United States.,Department of Bioengineering, University of California San Diego, La Jolla, CA, United States
| | - Carlos Jose Munoz
- Department of Bioengineering, University of California San Diego, La Jolla, CA, United States
| | - Pedro Cabrales
- Department of Bioengineering, University of California San Diego, La Jolla, CA, United States
| |
Collapse
|
2
|
Hou Z, Neng L, Zhang J, Cai J, Wang X, Zhang Y, Lopez IA, Shi X. Acoustic Trauma Causes Cochlear Pericyte-to-Myofibroblast-Like Cell Transformation and Vascular Degeneration, and Transplantation of New Pericytes Prevents Vascular Atrophy. THE AMERICAN JOURNAL OF PATHOLOGY 2020; 190:1943-1959. [PMID: 32562655 DOI: 10.1016/j.ajpath.2020.05.019] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/10/2020] [Revised: 05/19/2020] [Accepted: 05/26/2020] [Indexed: 12/20/2022]
Abstract
Acoustic trauma disrupts cochlear blood flow and damages sensory hair cells. Damage and regression of capillaries after acoustic trauma have long been observed, but the underlying mechanism of pathology has not been understood. We show herein that loud sound causes change of phenotype from neural/glial antigen 2 positive/α-smooth muscle actin negative to neural/glial antigen 2 positive/α-smooth muscle actin positive in some pericytes (PCs) on strial capillaries that is strongly associated with up-regulation of transforming growth factor-β1. The acoustic trauma also reduced capillary density and increased deposition of matrix proteins, particularly in the vicinity of transformed PCs. In a newly established in vitro three-dimensional endothelial cell (EC) and PC co-culture model, transformed PCs induced thicker capillary-like branches in ECs and increased collagen IV and laminin expression. Transplantation of exogenous PCs derived from neonatal day 10 mouse cochleae to acoustic traumatized cochleae, however, significantly attenuated the decreased vascular density in the stria. Transplantation of PCs pretransfected with adeno-associated virus 1-vascular endothelial growth factor-A165 under control of a hypoxia-response element markedly promotes vascular volume and blood flow, increased proliferation of PCs and ECs, and attenuated loud sound-caused loss in endocochlear potential and hearing. Our results indicate that loud sound-triggered PC transformation contributes to capillary wall thickening and regression, and young PC transplantation effectively rehabilitates the vascular regression and improves hearing.
Collapse
Affiliation(s)
- Zhiqiang Hou
- Department of Otolaryngology/Head & Neck Surgery, Oregon Hearing Research Center, Oregon Health & Science University, Portland, Oregon
| | - Lingling Neng
- Department of Otolaryngology/Head & Neck Surgery, Oregon Hearing Research Center, Oregon Health & Science University, Portland, Oregon
| | - Jinhui Zhang
- Department of Otolaryngology/Head & Neck Surgery, Oregon Hearing Research Center, Oregon Health & Science University, Portland, Oregon
| | - Jing Cai
- Department of Otolaryngology/Head & Neck Surgery, Oregon Hearing Research Center, Oregon Health & Science University, Portland, Oregon
| | - Xiaohan Wang
- Department of Otolaryngology/Head & Neck Surgery, Oregon Hearing Research Center, Oregon Health & Science University, Portland, Oregon; Center for Life Sciences, Boston Children's Hospital, Harvard Medical School, Boston, Massachusetts
| | - Yunpei Zhang
- Department of Otolaryngology/Head & Neck Surgery, Oregon Hearing Research Center, Oregon Health & Science University, Portland, Oregon
| | - Ivan A Lopez
- Cellular and Molecular Biology of the Inner Ear Laboratory, Department of Head and Neck Surgery, David Geffen School of Medicine at UCLA, Los Angeles, California
| | - Xiaorui Shi
- Department of Otolaryngology/Head & Neck Surgery, Oregon Hearing Research Center, Oregon Health & Science University, Portland, Oregon.
| |
Collapse
|
3
|
Zhang J, Wei Y, Qu T, Wang Z, Xu S, Peng X, Yan X, Chang H, Wang H, Gao Y. Prosurvival roles mediated by the PERK signaling pathway effectively prevent excessive endoplasmic reticulum stress-induced skeletal muscle loss during high-stress conditions of hibernation. J Cell Physiol 2019; 234:19728-19739. [PMID: 30941772 DOI: 10.1002/jcp.28572] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/25/2018] [Revised: 03/01/2019] [Accepted: 03/06/2019] [Indexed: 01/13/2023]
Abstract
Stress conditions like hypoxia, ischemia, and ischemia/reperfusion can trigger excessive endoplasmic reticulum stress (ERS), which can lead to cell apoptosis-induced skeletal muscle atrophy in non-hibernators. However, although hibernators experience multiple stress conditions during hibernation, their skeletal muscles appear to be well protected. We hypothesize that hibernators effectively avoid cell apoptosis, at least partially, by controlling ERS level. Here, we focused on the potential occurrence of ERS and how hibernators cope with it during different hibernation states. Results indicated that the protein expression levels of glucose-regulated protein 78 (GRP78), phosphorylated PKR-like ER protein kinase, phosphorylated eukaryotic translation initiation factor 2α (p-eIF2α), and activating transcription factor 4 were significantly increased during hibernation, but primarily recovered in posthibernation. In the torpor-arousal cycle, the expression levels of the above indicators were lower during inter-bout arousal (IBA) than that during late torpor (LT). However, there was no change in C/EBP homologous protein expression and no apoptosis in skeletal muscles during the different hibernation states. In conclusion, the upregulation of p-eIF2α and GRP78 were identified as two crucial mechanisms mediated by the PERK signaling pathway to alleviate elevated ERS. The downregulation of ERS during IBA may be a unique countermeasure for hibernating squirrels to prevent excessive ERS. Thus, these special anti-excessive ERS abilities of ground squirrels contribute to the prevention of skeletal muscle cell apoptosis during hibernation.
Collapse
Affiliation(s)
- Jie Zhang
- Key Laboratory of Resource Biology and Biotechnology in Western China, College of Life Sciences, Northwest University, Ministry of Education, Xi'an, China.,Shaanxi Key Laboratory for Animal Conservation, Northwest University, Xi'an, China
| | - Yanhong Wei
- Key Laboratory of Resource Biology and Biotechnology in Western China, College of Life Sciences, Northwest University, Ministry of Education, Xi'an, China.,Shaanxi Key Laboratory for Animal Conservation, Northwest University, Xi'an, China.,School of Basic Medical Sciences, Ningxia Medical University, Yinchuan, China
| | - Ting Qu
- Key Laboratory of Resource Biology and Biotechnology in Western China, College of Life Sciences, Northwest University, Ministry of Education, Xi'an, China.,Shaanxi Key Laboratory for Animal Conservation, Northwest University, Xi'an, China
| | - Zhe Wang
- Key Laboratory of Resource Biology and Biotechnology in Western China, College of Life Sciences, Northwest University, Ministry of Education, Xi'an, China.,Shaanxi Key Laboratory for Animal Conservation, Northwest University, Xi'an, China
| | - Shenhui Xu
- Key Laboratory of Resource Biology and Biotechnology in Western China, College of Life Sciences, Northwest University, Ministry of Education, Xi'an, China.,Shaanxi Key Laboratory for Animal Conservation, Northwest University, Xi'an, China
| | - Xin Peng
- Key Laboratory of Resource Biology and Biotechnology in Western China, College of Life Sciences, Northwest University, Ministry of Education, Xi'an, China.,Shaanxi Key Laboratory for Animal Conservation, Northwest University, Xi'an, China
| | - Xia Yan
- Key Laboratory of Resource Biology and Biotechnology in Western China, College of Life Sciences, Northwest University, Ministry of Education, Xi'an, China.,Shaanxi Key Laboratory for Animal Conservation, Northwest University, Xi'an, China
| | - Hui Chang
- Key Laboratory of Resource Biology and Biotechnology in Western China, College of Life Sciences, Northwest University, Ministry of Education, Xi'an, China.,Shaanxi Key Laboratory for Animal Conservation, Northwest University, Xi'an, China
| | - Huiping Wang
- Key Laboratory of Resource Biology and Biotechnology in Western China, College of Life Sciences, Northwest University, Ministry of Education, Xi'an, China.,Shaanxi Key Laboratory for Animal Conservation, Northwest University, Xi'an, China
| | - Yunfang Gao
- Key Laboratory of Resource Biology and Biotechnology in Western China, College of Life Sciences, Northwest University, Ministry of Education, Xi'an, China.,Shaanxi Key Laboratory for Animal Conservation, Northwest University, Xi'an, China
| |
Collapse
|
4
|
Clendenon SG, Fu X, Von Hoene RA, Clendenon JL, Sluka JP, Winfree S, Mang H, Martinez M, Filson AJ, Klaunig JE, Glazier JA, Dunn KW. A simple automated method for continuous fieldwise measurement of microvascular hemodynamics. Microvasc Res 2018; 123:7-13. [PMID: 30502365 DOI: 10.1016/j.mvr.2018.11.010] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/04/2018] [Revised: 11/27/2018] [Accepted: 11/27/2018] [Indexed: 01/25/2023]
Abstract
Microvascular perfusion dynamics are vital to physiological function and are frequently dysregulated in injury and disease. Typically studies measure microvascular flow in a few selected vascular segments over limited time, failing to capture spatial and temporal variability. To quantify microvascular flow in a more complete and unbiased way we developed STAFF (Spatial Temporal Analysis of Fieldwise Flow), a macro for FIJI open-source image analysis software. Using high-speed microvascular flow movies, STAFF generates kymographs for every time interval for every vascular segment, calculates flow velocities from red blood cell shadow angles, and outputs the data as color-coded velocity map movies and spreadsheets. In untreated mice, analyses demonstrated profound variation even between adjacent sinusoids over seconds. In acetaminophen-treated mice we detected flow reduction localized to pericentral regions. STAFF is a powerful new tool capable of providing novel insights by enabling measurement of the complex spatiotemporal dynamics of microvascular flow.
Collapse
Affiliation(s)
- Sherry G Clendenon
- Biocomplexity Institute, Indiana University, Bloomington, IN, USA; Department of Intelligent Systems Engineering, Indiana University, Bloomington, IN, USA
| | - Xiao Fu
- Biocomplexity Institute, Indiana University, Bloomington, IN, USA; Department of Physics, Indiana University, Bloomington, IN, USA
| | - Robert A Von Hoene
- Biocomplexity Institute, Indiana University, Bloomington, IN, USA; Department of Intelligent Systems Engineering, Indiana University, Bloomington, IN, USA
| | | | - James P Sluka
- Biocomplexity Institute, Indiana University, Bloomington, IN, USA; Department of Intelligent Systems Engineering, Indiana University, Bloomington, IN, USA
| | - Seth Winfree
- Department of Medicine, Indiana University, Indianapolis, IN, USA
| | - Henry Mang
- Department of Medicine, Indiana University, Indianapolis, IN, USA
| | | | - Adele J Filson
- Department of Medicine, Indiana University, Indianapolis, IN, USA
| | - James E Klaunig
- School of Public Health, Indiana University, Bloomington, IN, USA
| | - James A Glazier
- Biocomplexity Institute, Indiana University, Bloomington, IN, USA; Department of Intelligent Systems Engineering, Indiana University, Bloomington, IN, USA
| | - Kenneth W Dunn
- Department of Medicine, Indiana University, Indianapolis, IN, USA.
| |
Collapse
|
5
|
Chen G, Zhang Y, Yuan M, He S, Ying J, Li C. [Effect of simulated microgravity on peripheral oxygen saturation in rats]. SHENG WU YI XUE GONG CHENG XUE ZA ZHI = JOURNAL OF BIOMEDICAL ENGINEERING = SHENGWU YIXUE GONGCHENGXUE ZAZHI 2018; 35:57-59. [PMID: 29745601 PMCID: PMC10307542 DOI: 10.7507/1001-5515.201701023] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Subscribe] [Scholar Register] [Received: 01/13/2017] [Indexed: 11/03/2022]
Abstract
To study the effect of microgravity on peripheral oxygen saturation (SpO 2) in rats, tail-suspended rats were applied to simulate microgravity environment. SpO 2 and arterial oxygen saturation (SaO 2) were measured by pulse oximeter and arterial blood gas analyzer (ABGA) respectively on the 14th day, 21st day and 28th day in tail-suspended group and control group. Paired t-test shows that SpO 2 was significantly lower than SaO 2 in tail-suspended group on the 14th day ( P < 0.05), the 21st day ( P < 0.05) and the 28th day ( P < 0.01). The ANOVA results shows that modeling time had significant effect on SpO 2 value but no effect on SaO 2 value in tail-suspended group. These results indicate that pulse oximeter may be not suitable for oxygen saturation test in microgravity environment.
Collapse
Affiliation(s)
- Guangfei Chen
- Biomedical Engineering Department, Chinese Military General Hospital, Beijing 100853, P.R.China
| | - Yahui Zhang
- Biomedical Engineering Department, Chinese Military General Hospital, Beijing 100853,
| | - Ming Yuan
- Chinese Astronaut Research and Training Center, Beijing 100094, P.R.China
| | - Shilin He
- Biomedical Engineering Department, Chinese Military General Hospital, Beijing 100853, P.R.China
| | - Jun Ying
- Biomedical Engineering Department, Chinese Military General Hospital, Beijing 100853, P.R.China
| | - Chen Li
- Beijing Runkang Medical Instrument Co., Ldt, Beijing 102609, P.R.China
| |
Collapse
|
6
|
Entenberg D, Voiculescu S, Guo P, Borriello L, Wang Y, Karagiannis GS, Jones J, Baccay F, Oktay M, Condeelis J. A permanent window for the murine lung enables high-resolution imaging of cancer metastasis. Nat Methods 2017; 15:73-80. [PMID: 29176592 DOI: 10.1038/nmeth.4511] [Citation(s) in RCA: 107] [Impact Index Per Article: 15.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/22/2017] [Accepted: 10/25/2017] [Indexed: 12/26/2022]
Abstract
Stable, high-resolution intravital imaging of the lung has become possible through the utilization of vacuum-stabilized imaging windows. However, this technique is extremely invasive and limited to only hours in duration. Here we describe a minimally invasive, permanently implantable window for high-resolution intravital imaging of the murine lung that allows the mouse to survive surgery, recover from anesthesia, and breathe independently. Compared to vacuum-stabilized windows, this window produces the same high-quality images without vacuum-induced artifacts; it is also less invasive, which allows imaging of the same lung tissue over a period of weeks. We further adapt the technique of microcartography for reliable relocalization of the same cells longitudinally. Using commonly employed experimental, as well as more clinically relevant, spontaneous metastasis models, we visualize all stages of metastatic seeding, including: tumor cell arrival; extravasation; growth and progression to micrometastases; as well as tumor microenvironment of metastasis function, the hallmark of hematogenous dissemination of tumor cells.
Collapse
Affiliation(s)
- David Entenberg
- Anatomy and Structural Biology, Einstein College of Medicine, Montefiore Medical Center, Bronx, New York, USA.,Gruss-Lipper Biophotonics Center, Einstein College of Medicine, Montefiore Medical Center, Bronx, New York, USA.,Integrated Imaging Program, Einstein College of Medicine, Montefiore Medical Center, Bronx,New York, USA
| | - Sonia Voiculescu
- Anatomy and Structural Biology, Einstein College of Medicine, Montefiore Medical Center, Bronx, New York, USA.,Department of Surgery, Einstein College of Medicine, Montefiore Medical Center, Bronx, New York, USA
| | - Peng Guo
- Anatomy and Structural Biology, Einstein College of Medicine, Montefiore Medical Center, Bronx, New York, USA.,Gruss-Lipper Biophotonics Center, Einstein College of Medicine, Montefiore Medical Center, Bronx, New York, USA.,Analytical Imaging Facility, Einstein College of Medicine, Montefiore Medical Center, Bronx, New York, USA
| | - Lucia Borriello
- Anatomy and Structural Biology, Einstein College of Medicine, Montefiore Medical Center, Bronx, New York, USA.,Gruss-Lipper Biophotonics Center, Einstein College of Medicine, Montefiore Medical Center, Bronx, New York, USA
| | - Yarong Wang
- Anatomy and Structural Biology, Einstein College of Medicine, Montefiore Medical Center, Bronx, New York, USA.,Gruss-Lipper Biophotonics Center, Einstein College of Medicine, Montefiore Medical Center, Bronx, New York, USA.,Integrated Imaging Program, Einstein College of Medicine, Montefiore Medical Center, Bronx,New York, USA
| | - George S Karagiannis
- Anatomy and Structural Biology, Einstein College of Medicine, Montefiore Medical Center, Bronx, New York, USA.,Gruss-Lipper Biophotonics Center, Einstein College of Medicine, Montefiore Medical Center, Bronx, New York, USA.,Integrated Imaging Program, Einstein College of Medicine, Montefiore Medical Center, Bronx,New York, USA
| | - Joan Jones
- Anatomy and Structural Biology, Einstein College of Medicine, Montefiore Medical Center, Bronx, New York, USA.,Gruss-Lipper Biophotonics Center, Einstein College of Medicine, Montefiore Medical Center, Bronx, New York, USA.,Integrated Imaging Program, Einstein College of Medicine, Montefiore Medical Center, Bronx,New York, USA.,Department of Pathology, Einstein College of Medicine, Montefiore Medical Center, Bronx, New York, USA
| | - Francis Baccay
- Department of Surgery, Einstein College of Medicine, Montefiore Medical Center, Bronx, New York, USA
| | - Maja Oktay
- Anatomy and Structural Biology, Einstein College of Medicine, Montefiore Medical Center, Bronx, New York, USA.,Gruss-Lipper Biophotonics Center, Einstein College of Medicine, Montefiore Medical Center, Bronx, New York, USA.,Integrated Imaging Program, Einstein College of Medicine, Montefiore Medical Center, Bronx,New York, USA.,Department of Pathology, Einstein College of Medicine, Montefiore Medical Center, Bronx, New York, USA
| | - John Condeelis
- Anatomy and Structural Biology, Einstein College of Medicine, Montefiore Medical Center, Bronx, New York, USA.,Gruss-Lipper Biophotonics Center, Einstein College of Medicine, Montefiore Medical Center, Bronx, New York, USA.,Integrated Imaging Program, Einstein College of Medicine, Montefiore Medical Center, Bronx,New York, USA
| |
Collapse
|
7
|
Akons K, Dann EJ, Yelin D. Measuring blood oxygen saturation along a capillary vessel in human. BIOMEDICAL OPTICS EXPRESS 2017; 8:5342-5348. [PMID: 29188124 PMCID: PMC5695974 DOI: 10.1364/boe.8.005342] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/26/2017] [Revised: 09/27/2017] [Accepted: 09/27/2017] [Indexed: 05/22/2023]
Abstract
Measuring oxygen saturation in capillary vessels could provide valuable information on oxygen transport and tissue viability. Most spectroscopic measurement techniques, however, lack the spatial resolution to account for the small vessel dimensions within a scattering tissue and the steep gradients of oxygen saturation levels. Here, we developed a noninvasive technique for image-guided confocal measurement of the optical absorption spectrum from a small region that is comparable in size to the cross section of a single capillary vessel. A wide range of oxygen saturation levels were measured in a single capillary in a human volunteer, with blood deoxygenation rates of 7.1% per hundred microns. The technique could help in studying oxygen exchange dynamics in tissues and could play a key role in future clinical diagnosis and therapeutic applications that require localized functional tissue inspection.
Collapse
|
8
|
Wang Q, Li Q, Zhou M, Sun Z, Liu H, Wang Y. A hyperspectral vessel image registration method for blood oxygenation mapping. PLoS One 2017; 12:e0178499. [PMID: 28570589 PMCID: PMC5453521 DOI: 10.1371/journal.pone.0178499] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/13/2017] [Accepted: 05/14/2017] [Indexed: 11/19/2022] Open
Abstract
Blood oxygenation mapping by the means of optical oximetry is of significant importance in clinical trials. This paper uses hyperspectral imaging technology to obtain in vivo images for blood oxygenation detection. The experiment involves dorsal skin fold window chamber preparation which was built on adult (8-10 weeks of age) female BALB/c nu/nu mice and in vivo image acquisition which was performed by hyperspectral imaging system. To get the accurate spatial and spectral information of targets, an automatic registration scheme is proposed. An adaptive feature detection method which combines the local threshold method and the level-set filter is presented to extract target vessels. A reliable feature matching algorithm with the correlative information inherent in hyperspectral images is used to kick out the outliers. Then, the registration images are used for blood oxygenation mapping. Registration evaluation results show that most of the false matches are removed and the smooth and concentrated spectra are obtained. This intensity invariant feature detection with outliers-removing feature matching proves to be effective in hyperspectral vessel image registration. Therefore, in vivo hyperspectral imaging system by the assistance of the proposed registration scheme provides a technique for blood oxygenation research.
Collapse
Affiliation(s)
- Qian Wang
- Shanghai Key Laboratory of Multidimensional Information Processing, East China Normal University, Shanghai, China
| | - Qingli Li
- Shanghai Key Laboratory of Multidimensional Information Processing, East China Normal University, Shanghai, China
| | - Mei Zhou
- Shanghai Key Laboratory of Multidimensional Information Processing, East China Normal University, Shanghai, China
| | - Zhen Sun
- Jinling Hosp, Dept of Tangshan branch/sanatorium, Nanjing University, Sch. Med., Nanjing, China
| | - Hongying Liu
- Shanghai Key Laboratory of Multidimensional Information Processing, East China Normal University, Shanghai, China
| | - Yiting Wang
- Shanghai Key Laboratory of Multidimensional Information Processing, East China Normal University, Shanghai, China
| |
Collapse
|
9
|
Tibiletti M, Bianchi A, Stiller D, Rasche V. Pulmonary perfusion quantification with flow-sensitive inversion recovery (FAIR) UTE MRI in small animal imaging. NMR IN BIOMEDICINE 2016; 29:1791-1799. [PMID: 27809405 DOI: 10.1002/nbm.3657] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/03/2016] [Revised: 09/13/2016] [Accepted: 09/14/2016] [Indexed: 06/06/2023]
Abstract
Blood perfusion in lung parenchyma is an important property for assessing lung function. In small animals, its quantitation is limited even with radioactive isotopes or dynamic contrast-enhanced MRI techniques. In this study, the feasibility flow-sensitive alternating inversion recovery (FAIR) for the quantification of blood flow in lung parenchyma in free breathing rats at 7 T has been investigated. In order to obtain sufficient signal from the short T2 * lung parenchyma, a 2D ultra-short echo time (UTE) Look-Locker read-out has been implemented. Acquisitions were segmented to maintain acquisition time within an acceptable range. A method to perform retrospective respiratory gating (DC-SG) has been applied to investigate the impact of respiratory movement. Reproducibilities within and between sessions were estimated, and the ability of FAIR-UTE to identify the decrease of lung perfusion under hyperoxic conditions was tested. The implemented technique allowed for the visualization of lung parenchyma with excellent SNR and no respiratory artifact even in ungated acquisitions. Lung parenchyma perfusion was obtained as 32.54 ± 2.26 mL/g/min in the left lung, and 34.09 ± 2.75 mL/g/min in the right lung. Application of retrospective gating significantly but minimally changes the perfusion values, implying that respiratory gating may not be necessary with this center-our acquisition method. A decrease of 10% in lung perfusion was found between normoxic and hyperoxic conditions, proving the feasibility of the FAIR-UTE approach to quantify lung perfusion changes.
Collapse
Affiliation(s)
- Marta Tibiletti
- Core Facility Small Animal MRI, 89081 Ulm, University, Albert-Einstein-Allee 23, 89081 Ulm, Germany
| | - Andrea Bianchi
- In-Vivo Imaging Laboratory, Target Discovery Research, Boehringer Ingelheim Pharma, Birkendorfer Strasse 65, 88397 Biberach an der Riss, Germany
| | - Detlef Stiller
- In-Vivo Imaging Laboratory, Target Discovery Research, Boehringer Ingelheim Pharma, Birkendorfer Strasse 65, 88397 Biberach an der Riss, Germany
| | - Volker Rasche
- University Hospital of Ulm, Internal Medicine II, Ulm, Germany
| |
Collapse
|
10
|
Fiole D, Tournier JN. Intravital microscopy of the lung: minimizing invasiveness. JOURNAL OF BIOPHOTONICS 2016; 9:868-878. [PMID: 26846880 DOI: 10.1002/jbio.201500246] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/15/2015] [Revised: 01/08/2016] [Accepted: 01/09/2016] [Indexed: 06/05/2023]
Abstract
In vivo microscopy has recently become a gold standard in lung immunology studies involving small animals, largely benefiting from the democratization of multiphoton microscopy allowing for deep tissue imaging. This technology represents currently our only way of exploring the lungs and inferring what happens in human respiratory medicine. The interest of lung in vivo microscopy essentially relies upon its relevance as a study model, fulfilling physiological requirements in comparison with in vitro and ex vivo experiments. However, strategies developed in order to overcome movements of the thorax caused by breathing and heartbeats remain the chief drawback of the technique and a major source of invasiveness. In this context, minimizing invasiveness is an unavoidable prerequisite for any improvement of lung in vivo microscopy. This review puts into perspective the main techniques enabling lung in vivo microscopy, providing pros and cons regarding invasiveness.
Collapse
Affiliation(s)
- Daniel Fiole
- Unité Interactions Hôte-Agents pathogènes, Institut de Recherche Biomédicale des Armées, Brétigny-sur-Orge cedex, 91223, France.
- Human Histopathology and Animal Models, Institut Pasteur, 28 rue du docteur Roux, Paris, 75725, France.
| | - Jean-Nicolas Tournier
- Unité Interactions Hôte-Agents pathogènes, Institut de Recherche Biomédicale des Armées, Brétigny-sur-Orge cedex, 91223, France
- Laboratoire Pathogénie des Toxi-Infections Bactériennes, Institut Pasteur, 28 rue du docteur Roux, Paris, 75725, France
- Ecole du Val-de-Grâce, 1 place Alphonse Laveran, Paris, 75230, France
| |
Collapse
|
11
|
Choi M, Kwok SJJ, Yun SH. In vivo fluorescence microscopy: lessons from observing cell behavior in their native environment. Physiology (Bethesda) 2015; 30:40-9. [PMID: 25559154 DOI: 10.1152/physiol.00019.2014] [Citation(s) in RCA: 35] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022] Open
Abstract
Microscopic imaging techniques to visualize cellular behaviors in their natural environment play a pivotal role in biomedical research. Here, we review how recent technical advances in intravital microscopy have enabled unprecedented access to cellular physiology in various organs of mice in normal and diseased states.
Collapse
Affiliation(s)
- Myunghwan Choi
- Harvard Medical School and Wellman Center for Photomedicine, Massachusetts General Hospital, Boston, Massachusetts; and
| | - Sheldon J J Kwok
- Harvard Medical School and Wellman Center for Photomedicine, Massachusetts General Hospital, Boston, Massachusetts; and Harvard-MIT Health Sciences and Technology, Cambridge, Massachusetts
| | - Seok Hyun Yun
- Harvard Medical School and Wellman Center for Photomedicine, Massachusetts General Hospital, Boston, Massachusetts; and Harvard-MIT Health Sciences and Technology, Cambridge, Massachusetts
| |
Collapse
|
12
|
Silva DMG, Nardiello C, Pozarska A, Morty RE. Recent advances in the mechanisms of lung alveolarization and the pathogenesis of bronchopulmonary dysplasia. Am J Physiol Lung Cell Mol Physiol 2015; 309:L1239-72. [PMID: 26361876 DOI: 10.1152/ajplung.00268.2015] [Citation(s) in RCA: 114] [Impact Index Per Article: 12.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/05/2015] [Accepted: 09/09/2015] [Indexed: 02/08/2023] Open
Abstract
Alveolarization is the process by which the alveoli, the principal gas exchange units of the lung, are formed. Along with the maturation of the pulmonary vasculature, alveolarization is the objective of late lung development. The terminal airspaces that were formed during early lung development are divided by the process of secondary septation, progressively generating an increasing number of alveoli that are of smaller size, which substantially increases the surface area over which gas exchange can take place. Disturbances to alveolarization occur in bronchopulmonary dysplasia (BPD), which can be complicated by perturbations to the pulmonary vasculature that are associated with the development of pulmonary hypertension. Disturbances to lung development may also occur in persistent pulmonary hypertension of the newborn in term newborn infants, as well as in patients with congenital diaphragmatic hernia. These disturbances can lead to the formation of lungs with fewer and larger alveoli and a dysmorphic pulmonary vasculature. Consequently, affected lungs exhibit a reduced capacity for gas exchange, with important implications for morbidity and mortality in the immediate postnatal period and respiratory health consequences that may persist into adulthood. It is the objective of this Perspectives article to update the reader about recent developments in our understanding of the molecular mechanisms of alveolarization and the pathogenesis of BPD.
Collapse
Affiliation(s)
- Diogo M G Silva
- Department of Internal Medicine (Pulmonology), University of Giessen and Marburg Lung Center (UGMLC), Member of the German Center for Lung Research (DZL), Giessen, Germany; Department of Lung Development and Remodelling, Max Planck Institute for Heart and Lung Research, Bad Nauheim, Germany
| | - Claudio Nardiello
- Department of Internal Medicine (Pulmonology), University of Giessen and Marburg Lung Center (UGMLC), Member of the German Center for Lung Research (DZL), Giessen, Germany; Department of Lung Development and Remodelling, Max Planck Institute for Heart and Lung Research, Bad Nauheim, Germany
| | - Agnieszka Pozarska
- Department of Internal Medicine (Pulmonology), University of Giessen and Marburg Lung Center (UGMLC), Member of the German Center for Lung Research (DZL), Giessen, Germany; Department of Lung Development and Remodelling, Max Planck Institute for Heart and Lung Research, Bad Nauheim, Germany
| | - Rory E Morty
- Department of Internal Medicine (Pulmonology), University of Giessen and Marburg Lung Center (UGMLC), Member of the German Center for Lung Research (DZL), Giessen, Germany; Department of Lung Development and Remodelling, Max Planck Institute for Heart and Lung Research, Bad Nauheim, Germany
| |
Collapse
|
13
|
Fais S, Venturi G, Gatenby B. Microenvironmental acidosis in carcinogenesis and metastases: new strategies in prevention and therapy. Cancer Metastasis Rev 2015; 33:1095-108. [PMID: 25376898 PMCID: PMC4244550 DOI: 10.1007/s10555-014-9531-3] [Citation(s) in RCA: 121] [Impact Index Per Article: 13.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
Much effort is currently devoted to developing patient-specific cancer therapy based on molecular characterization of tumors. In particular, this approach seeks to identify driver mutations that can be blocked through small molecular inhibitors. However, this approach is limited by extensive intratumoral genetic heterogeneity, and, not surprisingly, even dramatic initial responses are typically of limited duration as resistant tumor clones rapidly emerge and proliferate. We propose an alternative approach based on observations that while tumor evolution produces genetic divergence, it is also associated with striking phenotypic convergence that loosely correspond to the well-known cancer “hallmarks”. These convergent properties can be described as driver phenotypes and may be more consistently and robustly expressed than genetic targets. To this purpose, it is necessary to identify strategies that are critical for cancer progression and metastases, and it is likely that these driver phenotypes will be closely related to cancer “hallmarks”. It appears that an antiacidic approach, by targetting a driver phenotype in tumors, may be thought as a future strategy against tumors in either preventing the occurrence of cancer or treating tumor patients with multiple aims, including the improvement of efficacy of existing therapies, possibly reducing their systemic side effects, and controlling tumor growth, progression, and metastasis. This may be achieved with existing molecules such as proton pump inhibitors (PPIs) and buffers such as sodium bicarbonate, citrate, or TRIS.
Collapse
Affiliation(s)
- Stefano Fais
- Department of Therapeutic Research and Medicines Evaluation, Unit of Antitumor Drugs, Istituto Superiore di Sanità, Viale Regina Elena 299, Rome, Italy
- Department of Drug Research and Medicines Evaluation, Istituto Superiore di Sanità (National Institute of Health), Viale Regina Elena 299, 00161 Rome, Italy
| | - Giulietta Venturi
- Department of Therapeutic Research and Medicines Evaluation, Unit of Antitumor Drugs, Istituto Superiore di Sanità, Viale Regina Elena 299, Rome, Italy
| | - Bob Gatenby
- Radiology Department, Cancer Biology and Evolution Program Moffitt Cancer Center, 12902 Magnolia Drive, Tampa, FL 33612 USA
| |
Collapse
|
14
|
Fontanella AN, Boss MK, Hadsell M, Zhang J, Schroeder T, Berman KG, Dewhirst MW, Chang S, Palmer GM. Effects of high-dose microbeam irradiation on tumor microvascular function and angiogenesis. Radiat Res 2015; 183:147-58. [PMID: 25574586 DOI: 10.1667/rr13712.1] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Abstract
Microbeam radiation therapy (MRT) is a form of cancer treatment in which a single large dose of radiation is spatially fractionated in-line or grid-like patterns. Preclinical studies have demonstrated that MRT is capable of eliciting high levels of tumor response while sparing normal tissue that is exposed to the same radiation field. Since a large fraction of the MRT-treated tumor is in the dose valley region that is not directly irradiated, tumor response may be driven by radiation bystander effects, which in turn elicit a microvascular response. Differential alterations in hemodynamics between the tumor and normal tissue may explain the therapeutic advantages of MRT. Direct observation of these dynamic responses presents a challenge for conventional ex vivo analysis. Furthermore, knowledge gleaned from in vitro studies of radiation bystander response has not been widely incorporated into in vivo models of tumor radiotherapy, and the biological contribution of the bystander effect within the tumor microenvironment is unknown. In this study, we employed noninvasive, serial observations of the tumor microenvironment to address the question of how tumor vasculature and HIF-1 expression are affected by microbeam radiotherapy. Tumors (approximately 4 mm in diameter) grown in a dorsal window chamber were irradiated in a single fraction using either a single, microplanar beam (300 micron wide swath) or a wide-field setup (whole-window chamber) to a total dose of 50 Gy. The tumors were optically observed daily for seven days postirradiation. Microvascular changes in the tumor and surrounding normal tissue differed greatly between the wide-field and microbeam treatments. We present evidence that these changes may be due to dissimilar spatial and temporal patterns of HIF-1 expression induced through radiation bystander effects.
Collapse
Affiliation(s)
- Andrew N Fontanella
- a Department of Biomedical Engineering, Duke University, Durham, North Carolina
| | | | | | | | | | | | | | | | | |
Collapse
|
15
|
Blueschke G, Hanna G, Fontanella AN, Palmer GM, Boico A, Min H, Dewhirst MW, Irwin DC, Zhao Y, Schroeder T. Automated measurement of microcirculatory blood flow velocity in pulmonary metastases of rats. J Vis Exp 2014:e51630. [PMID: 25490280 DOI: 10.3791/51630] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023] Open
Abstract
Because the lung is a major target organ of metastatic disease, animal models to study the physiology of pulmonary metastases are of great importance. However, very few methods exist to date to investigate lung metastases in a dynamic fashion at the microcirculatory level, due to the difficulty to access the lung with a microscope. Here, an intravital microscopy method is presented to functionally image and quantify the microcirculation of superficial pulmonary metastases in rats, using a closed-chest pulmonary window and automated analysis of blood flow velocity and direction. The utility of this method is demonstrated to measure increases in blood flow velocity in response to pharmacological intervention, and to image the well-known tortuous vasculature of solid tumors. This is the first demonstration of intravital microscopy on pulmonary metastases in a closed-chest model. Because of its minimized invasiveness, as well as due to its relative ease and practicality, this technology has the potential to experience widespread use in laboratories that specialize on pulmonary tumor research.
Collapse
Affiliation(s)
- Gert Blueschke
- Division of Plastic, Maxillofacial, and Oral Surgery, Duke University Medical Center
| | - Gabi Hanna
- Department of Radiation Oncology, Duke University Medical Center
| | | | - Gregory M Palmer
- Department of Radiation Oncology, Duke University Medical Center
| | - Alina Boico
- Department of Radiation Oncology, Duke University Medical Center
| | - Hooney Min
- Department of Radiation Oncology, Duke University Medical Center
| | - Mark W Dewhirst
- Department of Radiation Oncology, Duke University Medical Center
| | - David C Irwin
- Department of Cardiology, University of Colorado Denver
| | - Yulin Zhao
- Department of Radiation Oncology, Duke University Medical Center
| | | |
Collapse
|
16
|
Salaün M, Modzelewski R, Marie JP, Moreno-Swirc S, Bourg-Heckly G, Thiberville L. In vivo assessment of the pulmonary microcirculation in elastase-induced emphysema using probe-based confocal fluorescence microscopy. INTRAVITAL 2014. [DOI: 10.4161/intv.23471] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
|
17
|
Fontanella AN, Schroeder T, Hochman DW, Chen RE, Hanna G, Haglund MM, Rajaram N, Frees AE, Secomb TW, Palmer GM, Dewhirst MW. Quantitative mapping of hemodynamics in the lung, brain, and dorsal window chamber-grown tumors using a novel, automated algorithm. Microcirculation 2014; 20:724-35. [PMID: 23781901 DOI: 10.1111/micc.12072] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/07/2013] [Accepted: 06/14/2013] [Indexed: 12/01/2022]
Abstract
OBJECTIVE Hemodynamic properties of vascular beds are of great interest in a variety of clinical and laboratory settings. However, there presently exists no automated, accurate, technically simple method for generating blood velocity maps of complex microvessel networks. METHODS Here, we present a novel algorithm that addresses the problem of acquiring quantitative maps by applying pixel-by-pixel cross-correlation to video data. Temporal signals at every spatial coordinate are compared with signals at neighboring points, generating a series of correlation maps from which speed and direction are calculated. User-assisted definition of vessel geometries is not required, and sequential data are analyzed automatically, without user bias. RESULTS Velocity measurements were validated against the dual-slit method and against in vitro capillary flow with known velocities. The algorithm was tested in three different biological models in order to demonstrate its versatility. CONCLUSIONS The hemodynamic maps presented here demonstrate an accurate, quantitative method of analyzing dynamic vascular systems.
Collapse
Affiliation(s)
- Andrew N Fontanella
- Department of Biomedical Engineering, Duke University, Durham, North Carolina, USA
| | | | | | | | | | | | | | | | | | | | | |
Collapse
|
18
|
Radiloff D, Zhao Y, Boico A, Blueschke G, Palmer G, Fontanella A, Dewhirst M, Piantadosi CA, Noveck R, Irwin D, Hamilton K, Klitzman B, Schroeder T. Anti-hypotensive treatment and endothelin blockade synergistically antagonize exercise fatigue in rats under simulated high altitude. PLoS One 2014; 9:e99309. [PMID: 24960187 PMCID: PMC4068990 DOI: 10.1371/journal.pone.0099309] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/13/2013] [Accepted: 05/12/2014] [Indexed: 02/04/2023] Open
Abstract
Rapid ascent to high altitude causes illness and fatigue, and there is a demand for effective acute treatments to alleviate such effects. We hypothesized that increased oxygen delivery to the tissue using a combination of a hypertensive agent and an endothelin receptor A antagonist drugs would limit exercise-induced fatigue at simulated high altitude. Our data showed that the combination of 0.1 mg/kg ambrisentan with either 20 mg/kg ephedrine or 10 mg/kg methylphenidate significantly improved exercise duration in rats at simulated altitude of 4,267 m, whereas the individual compounds did not. In normoxic, anesthetized rats, ephedrine alone and in combination with ambrisentan increased heart rate, peripheral blood flow, carotid and pulmonary arterial pressures, breathing rate, and vastus lateralis muscle oxygenation, but under inspired hypoxia, only the combination treatment significantly enhanced muscle oxygenation. Our results suggest that sympathomimetic agents combined with endothelin-A receptor blockers offset altitude-induced fatigue in rats by synergistically increasing the delivery rate of oxygen to hypoxic muscle by concomitantly augmenting perfusion pressure and improving capillary conductance in the skeletal muscle. Our findings might therefore serve as a basis to develop an effective treatment to prevent high-altitude illness and fatigue in humans.
Collapse
Affiliation(s)
- Daniel Radiloff
- Department of Radiation Oncology, Duke University Medical Center, Durham, North Carolina, United States of America
| | - Yulin Zhao
- Department of Radiation Oncology, Duke University Medical Center, Durham, North Carolina, United States of America
| | - Alina Boico
- Department of Radiation Oncology, Duke University Medical Center, Durham, North Carolina, United States of America
| | - Gert Blueschke
- Department of Surgery, Duke University Medical Center, Durham, North Carolina, United States of America
| | - Gregory Palmer
- Department of Radiation Oncology, Duke University Medical Center, Durham, North Carolina, United States of America
| | - Andrew Fontanella
- Department of Radiation Oncology, Duke University Medical Center, Durham, North Carolina, United States of America
| | - Mark Dewhirst
- Department of Radiation Oncology, Duke University Medical Center, Durham, North Carolina, United States of America
| | - Claude A. Piantadosi
- Department of Medicine-Pulmonary, Duke University Medical Center, Durham, North Carolina, United States of America
| | - Robert Noveck
- Department of Medicine-Clinical Pharmacology, Duke University Medical Center, Durham, North Carolina, United States of America
| | - David Irwin
- Department of Cardiology, University of Colorado Denver, Aurora, Colorado, United States of America
| | - Karyn Hamilton
- Department of Health and Exercise Science, Colorado State University, Fort Collins, Colorado, United States of America
| | - Bruce Klitzman
- Department of Surgery, Duke University Medical Center, Durham, North Carolina, United States of America
| | - Thies Schroeder
- Department of Physical Chemistry, University of Mainz, Mainz, Germany
| |
Collapse
|