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Lindelauf AAMA, van Rooij JAF, Hartveld L, van der Hulst RRWJ, Weerwind PW, Schols RM. Tissue Oximetry Changes during Postoperative Dangling in Lower Extremity Free Flap Reconstruction: A Pilot Study. Life (Basel) 2023; 13:life13051158. [PMID: 37240803 DOI: 10.3390/life13051158] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/22/2022] [Revised: 04/28/2023] [Accepted: 05/09/2023] [Indexed: 05/28/2023] Open
Abstract
Background: Lower extremity free flap dangling protocols are still widely practiced, despite a paucity of evidence for their use. This pilot study investigates the use of tissue oximetry to provide further insight into the physiological effect of postoperative dangling in lower limb free flap transfer. Methods: Ten patients undergoing lower extremity free flap reconstruction were included in this study. Free flap tissue oxygen saturation (StO2) was continuously measured using non-invasive near-infrared spectroscopy. Measurements were performed on the free flap and contralateral limb during dangling from postoperative day (POD) 7 until 11, according to the local dangling protocol. Results: StO2 values measured in the free flap diminished to 70 ± 13.7% during dangling. This minimum StO2 was reached significantly later, and correspondingly the area under the curve (AUC) was significantly larger on POD 11 compared to the start of the dangling protocol on POD 7, reflecting an improving free flap microvascular reactivity. The dangling slope was equal between the free flap and contralateral leg. The reperfusion slope was significantly flatter on POD 7 compared to the other PODs (p < 0.001). Thereafter, no significant differences between PODs were observed. Patients with a history of smoking had significantly lower tissue oximetry values compared to non-smokers. Conclusions: The application of tissue oximetry during dangling provides further insight into the physiological effect (i.e., changes in microcirculatory function) of the free flap of the reconstructed lower extremity. This information could potentially be useful to either revise or disrupt the use of such dangling protocols.
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Affiliation(s)
- Anouk A M A Lindelauf
- Department of Cardiothoracic Surgery, Maastricht University Medical Center, 6202 AZ Maastricht, The Netherlands
| | - Joep A F van Rooij
- Department of Plastic, Reconstructive and Hand Surgery, Maastricht University Medical Center, 6202 AZ Maastricht, The Netherlands
| | - Loes Hartveld
- Department of Plastic, Reconstructive and Hand Surgery, Maastricht University Medical Center, 6202 AZ Maastricht, The Netherlands
| | - René R W J van der Hulst
- Department of Plastic, Reconstructive and Hand Surgery, Maastricht University Medical Center, 6202 AZ Maastricht, The Netherlands
| | - Patrick W Weerwind
- Department of Cardiothoracic Surgery, Maastricht University Medical Center, 6202 AZ Maastricht, The Netherlands
| | - Rutger M Schols
- Department of Plastic, Reconstructive and Hand Surgery, Maastricht University Medical Center, 6202 AZ Maastricht, The Netherlands
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Budylin GS, Davydov DA, Zlobina NV, Baev AV, Artyushenko VG, Yakimov BP, Shirshin EA. In vivo sensing of cutaneous edema: A comparative study of diffuse reflectance, Raman spectroscopy and multispectral imaging. JOURNAL OF BIOPHOTONICS 2022; 15:e202100268. [PMID: 34661967 DOI: 10.1002/jbio.202100268] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/30/2021] [Revised: 10/11/2021] [Accepted: 10/12/2021] [Indexed: 06/13/2023]
Abstract
Quantitative noninvasive assessment of water content in tissues is important for biomedicine. Optical spectroscopy is potentially capable of solving this problem; however, its applicability for clinical diagnostics remains questionable. The presented study compares diffuse reflectance spectroscopy, Raman spectroscopy and multispectral imaging in the characterization of cutaneous edema. The source-detector geometries for each method are selected based on Monte Carlo simulations results to detect the signal from the dermis. Then, the kinetics of the edema development is studied for two models. All methods demonstrate synchronous trends for histamine-induced edema: The water content reaches a maximum of 1 hour after histamine application and then gradually decreases. For the venous occlusion, a 51% increase in water content is observed with Raman spectroscopy. The differences in water content estimation by three methods are explained based on the light propagation model. The obtained results are essential for introducing quantitative optical water measurement technology to the clinics.
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Affiliation(s)
- Gleb S Budylin
- Medical Research and Education Center, M. V. Lomonosov Moscow State University, Moscow, Russia
- Institute of Spectroscopy of the Russian Academy of Sciences, Moscow, Russia
- World-Class Research Center "Digital Biodesign and Personalized Healthcare", Sechenov First Moscow State Medical University, Moscow, Russia
| | - Denis A Davydov
- Medical Research and Education Center, M. V. Lomonosov Moscow State University, Moscow, Russia
- Faculty of Physics, Lomonosov Moscow State University, Moscow, Russia
| | - Nadezhda V Zlobina
- Medical Research and Education Center, M. V. Lomonosov Moscow State University, Moscow, Russia
- Faculty of Physics, Lomonosov Moscow State University, Moscow, Russia
| | - Alexey V Baev
- Faculty of Physics, Lomonosov Moscow State University, Moscow, Russia
| | | | - Boris P Yakimov
- Medical Research and Education Center, M. V. Lomonosov Moscow State University, Moscow, Russia
- World-Class Research Center "Digital Biodesign and Personalized Healthcare", Sechenov First Moscow State Medical University, Moscow, Russia
- Faculty of Physics, Lomonosov Moscow State University, Moscow, Russia
| | - Evgeny A Shirshin
- Medical Research and Education Center, M. V. Lomonosov Moscow State University, Moscow, Russia
- World-Class Research Center "Digital Biodesign and Personalized Healthcare", Sechenov First Moscow State Medical University, Moscow, Russia
- Faculty of Physics, Lomonosov Moscow State University, Moscow, Russia
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3
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Abdlaty R, Fang Q. Skin erythema assessment techniques. Clin Dermatol 2021; 39:591-604. [PMID: 34809765 DOI: 10.1016/j.clindermatol.2021.03.006] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
Abstract
Skin erythema may present owing to many causes. One of the common causes is prolonged exposure to sunrays. Other than sun exposure, skin erythema is an accompanying sign of dermatologic diseases, such as psoriasis and acne. Quantifying skin erythema in patients enables the dermatologist to assess the patient's skin health. Quantitative assessment of skin erythema has been the focus of several studies. The clinical standard for erythema evaluation is visual assessment; however, this standard has some deficiencies. For instance, visual assessment is subjective and ineffectual for precise color information exchange. To overcome these limitations, in the past three decades various methodologies have been developed in an attempt to achieve objective erythema assessments, such as diffuse reflectance spectroscopy and both optical and nonoptical systems. This review considers the studies published during the past three decades and discusses the performance, the mathematical tactics for computation, and the limited capabilities of erythema assessment techniques for cutaneous diseases. The achievements and limitations of the current techniques in erythema assessment are presented. The advantages and development trends of optical and nonoptical methods are presented to make the reader aware of the present technological advances and their potential for dermatological disease research.
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Affiliation(s)
- Ramy Abdlaty
- Biomedical Engineering, Military Technical College, Kobry-Elkobba, Cairo, Egypt
| | - Qiyin Fang
- Department of Engineering Physics, McMaster University, Hamilton, ONT, Canada.
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4
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Yakimov BP, Gurfinkel YI, Davydov DA, Allenova AS, Budylin GS, Vasiliev VY, Soldatova VY, Kamalov AA, Matskeplishvili ST, Priezzhev AV, Shirshin EA. Pericapillary Edema Assessment by Means of the Nailfold Capillaroscopy and Laser Scanning Microscopy. Diagnostics (Basel) 2020; 10:diagnostics10121107. [PMID: 33353241 PMCID: PMC7766602 DOI: 10.3390/diagnostics10121107] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/03/2020] [Revised: 12/15/2020] [Accepted: 12/16/2020] [Indexed: 01/09/2023] Open
Abstract
Edema, i.e., fluid accumulation in the interstitial space, accompanies numerous pathological states of the human organism, including heart failure (HF), inflammatory response, and lymphedema. Nevertheless, techniques for quantitative assessment of the edema’s severity and dynamics are absent in clinical practice, and the analysis is mainly limited to physical examination. This fact stimulates the development of novel methods for fast and reliable diagnostics of fluid retention in tissues. In this work, we focused on the possibilities of two microscopic techniques, nailfold video capillaroscopy (NVC) and confocal laser scanning microscopy (CLSM), in the assessment of the short-term and long-term cutaneous edema. We showed that for the patients with HF, morphological parameters obtained by NVC—namely, the apical diameter of capillaries and the size of the perivascular zone—indicate long-term edema. On the other hand, for healthy volunteers, the application of two models of short-term edema, venous occlusion, and histamine treatment of the skin, did not reveal notable changes in the capillary parameters. However, a significant reduction of the NVC image sharpness was observed in this case, which was suggested to be due to water accumulation in the epidermis. To verify these findings, we made use of CLSM, which provides the skin structure with cellular resolution. It was observed that for the histamine-treated skin, the areas of the dermal papillae become hyporefractive, leading to the loss of contrast and the lower visibility of capillaries. Similar effect was observed for patients undergoing infusion therapy. Collectively, our results reveal the parameters can be used for pericapillary edema assessment using the NVC and CLSM, and paves the way for their application in a clinical set-up.
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Affiliation(s)
- Boris P. Yakimov
- Faculty of Physics, Lomonosov Moscow State University, Leninskie Gory 1/2, 119991 Moscow, Russia; (B.P.Y.); (D.A.D.); (A.V.P.)
- Institute for Regenerative Medicine, Sechenov First Moscow State Medical University, Trubetskaya 8-2, 119991 Moscow, Russia
| | - Yury I. Gurfinkel
- Medical Research and Education Center, M.V. Lomonosov Moscow State University, Lomonosovsky Prospect 27/10, 119991 Moscow, Russia; (Y.I.G.); (G.S.B.); (A.A.K.); (S.T.M.)
| | - Denis A. Davydov
- Faculty of Physics, Lomonosov Moscow State University, Leninskie Gory 1/2, 119991 Moscow, Russia; (B.P.Y.); (D.A.D.); (A.V.P.)
| | - Anastasia S. Allenova
- Division of Immune-Mediated Skin Diseases, Sechenov First Moscow State Medical University, Trubetskaya 8-2, 119991 Moscow, Russia;
| | - Gleb S. Budylin
- Medical Research and Education Center, M.V. Lomonosov Moscow State University, Lomonosovsky Prospect 27/10, 119991 Moscow, Russia; (Y.I.G.); (G.S.B.); (A.A.K.); (S.T.M.)
- Institute of Spectroscopy of the Russian Academy of Sciences, Fizicheskaya Street, 5, Troitsk, 108840 Moscow, Russia
| | - Vladimir Yu. Vasiliev
- A.I. Yevdokimov Moscow State University of Medicine and Dentistry, Delegatskaya Street, 20, 127473 Moscow, Russia; (V.Y.V.); (V.Y.S.)
| | - Vera Yu. Soldatova
- A.I. Yevdokimov Moscow State University of Medicine and Dentistry, Delegatskaya Street, 20, 127473 Moscow, Russia; (V.Y.V.); (V.Y.S.)
| | - Armais A. Kamalov
- Medical Research and Education Center, M.V. Lomonosov Moscow State University, Lomonosovsky Prospect 27/10, 119991 Moscow, Russia; (Y.I.G.); (G.S.B.); (A.A.K.); (S.T.M.)
| | - Simon T. Matskeplishvili
- Medical Research and Education Center, M.V. Lomonosov Moscow State University, Lomonosovsky Prospect 27/10, 119991 Moscow, Russia; (Y.I.G.); (G.S.B.); (A.A.K.); (S.T.M.)
| | - Alexander V. Priezzhev
- Faculty of Physics, Lomonosov Moscow State University, Leninskie Gory 1/2, 119991 Moscow, Russia; (B.P.Y.); (D.A.D.); (A.V.P.)
| | - Evgeny A. Shirshin
- Faculty of Physics, Lomonosov Moscow State University, Leninskie Gory 1/2, 119991 Moscow, Russia; (B.P.Y.); (D.A.D.); (A.V.P.)
- Medical Research and Education Center, M.V. Lomonosov Moscow State University, Lomonosovsky Prospect 27/10, 119991 Moscow, Russia; (Y.I.G.); (G.S.B.); (A.A.K.); (S.T.M.)
- Correspondence:
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Abdlaty R, Hayward J, Farrell T, Fang Q. Skin erythema and pigmentation: a review of optical assessment techniques. Photodiagnosis Photodyn Ther 2020; 33:102127. [PMID: 33276114 DOI: 10.1016/j.pdpdt.2020.102127] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/30/2020] [Revised: 10/28/2020] [Accepted: 11/23/2020] [Indexed: 10/22/2022]
Abstract
BACKGROUND Skin erythema may present due to many causes. One of the common causes is prolonged exposure to sun rays. Other than sun exposure, skin erythema is an accompanying sign of dermatological diseases such as acne, psoriasis, melasma, post inflammatory hyperpigmentation, fever, as well as exposure to specific electromagnetic wave bands. METHODS Quantifying skin erythema in patients enables the dermatologist to assess the patient's skin health. Therefore, quantitative assessment of skin erythema was the target of several studies. The clinical standard for erythema evaluation is visual assessment. However, the former standard has some imperfections. For instance, it is subjective, and unqualified for precise color information exchange. To overcome these shortcomings, the past three decades witnessed various methodologies that aimed to achieve erythema objective assessment, such as diffuse reflectance spectroscopy (DRS), and both optical and non-optical systems. DISCUSSION This review article reports on the studies published in the past three decades where the performance, the mathematical tactics for computation, and the capabilities of erythema assessment techniques for cutaneous diseases are discussed. In particular, the achievements and limitations of the current techniques in erythema assessment are presented. CONCLUSION The profits and development trends of optical and non-optical methods are displayed to provide the researcher with awareness into the present technological advances and its potential for dermatological diseases research.
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Affiliation(s)
| | - Joseph Hayward
- Juravinski Cancer Centre, Hamilton Health Sciences, Ontario, Canada
| | - Thomas Farrell
- Department of Medical Physics and Applied Radiation Sciences, McMaster University, Ontario, Canada
| | - Qiyin Fang
- Engineering Physics, McMaster University, Ontario, Canada
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6
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Saiko G, Lombardi P, Au Y, Queen D, Armstrong D, Harding K. Hyperspectral imaging in wound care: A systematic review. Int Wound J 2020; 17:1840-1856. [PMID: 32830443 PMCID: PMC7949456 DOI: 10.1111/iwj.13474] [Citation(s) in RCA: 42] [Impact Index Per Article: 10.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/27/2020] [Revised: 07/07/2020] [Accepted: 07/15/2020] [Indexed: 01/18/2023] Open
Abstract
Multispectral and hyperspectral imaging (HSI) are emerging imaging techniques with the potential to transform the way patients with wounds are cared for, but it is not clear whether current systems are capable of delivering real-time tissue characterisation and treatment guidance. We conducted a systematic review of HSI systems that have been assessed in patients, published over the past 32 years. We analysed 140 studies, including 10 different HSI systems. Current in vivo HSI systems generate a tissue oxygenation map. Tissue oxygenation measurements may help to predict those patients at risk of wound formation or delayed healing. No safety concerns were reported in any studies. A small number of studies have demonstrated the capabilities of in vivo label-free HSI, but further work is needed to fully integrate it into the current clinical workflow for different wound aetiologies. As an emerging imaging modality for medical applications, HSI offers great potential for non-invasive disease diagnosis and guidance when treating patients with both acute and chronic wounds.
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Affiliation(s)
| | | | | | | | - David Armstrong
- Keck School of MedicineUniversity of Southern California, Los AngelesCaliforniaCaliforniaCanada
| | - Keith Harding
- School of MedicineCardiff UniversityWalesUK
- A*STARSingapore
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7
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Du T, Mishra DK, Shmuylovich L, Yu A, Hurbon H, Wang ST, Berezin MY. Hyperspectral imaging and characterization of allergic contact dermatitis in the short-wave infrared. JOURNAL OF BIOPHOTONICS 2020; 13:e202000040. [PMID: 32418362 PMCID: PMC7549435 DOI: 10.1002/jbio.202000040] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/08/2020] [Revised: 05/06/2020] [Accepted: 05/13/2020] [Indexed: 06/11/2023]
Abstract
Short-wave infrared hyperspectral imaging is applied to diagnose and monitor a case of allergic contact dermatitis (ACD) due to poison ivy exposure in one subject. This approach directly demonstrates increased tissue fluid content in ACD lesional skin with a spectral signature that matches the spectral signature of intradermally injected normal saline. The best contrast between the affected and unaffected skin is achieved through a selection of specific wavelengths at 1070, 1340 and 1605 nm and combining them in a pseudo-red-green-blue color space. An image derived from these wavelengths normalized to unaffected skin defines a "tissue fluid index" that may aid in the quantitative diagnosis and monitoring of ACD. Further clinical testing of this promising approach towards disease detection and monitoring with tissue fluid content quantification is warranted.
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Affiliation(s)
- Tommy Du
- Department of Radiology, Washington University School of Medicine, St. Louis, Missouri
| | - Deependra K. Mishra
- Department of Radiology, Washington University School of Medicine, St. Louis, Missouri
| | - Leonid Shmuylovich
- Department of Radiology, Washington University School of Medicine, St. Louis, Missouri
- Division of Dermatology, Washington University School of Medicine, St. Louis, Missouri
| | - Andy Yu
- Department of Radiology, Washington University School of Medicine, St. Louis, Missouri
| | - Helena Hurbon
- Department of Radiology, Washington University School of Medicine, St. Louis, Missouri
| | - Steven T. Wang
- Department of Radiology, Washington University School of Medicine, St. Louis, Missouri
| | - Mikhail Y. Berezin
- Department of Radiology, Washington University School of Medicine, St. Louis, Missouri
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8
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Saiko G, Lombardi P, Au Y, Queen D, Armstrong D, Harding K. Hyperspectral imaging in wound care: A systematic review. Int Wound J 2020. [PMID: 32830443 DOI: 10.1111/iwj.13474.] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023] Open
Abstract
Multispectral and hyperspectral imaging (HSI) are emerging imaging techniques with the potential to transform the way patients with wounds are cared for, but it is not clear whether current systems are capable of delivering real-time tissue characterisation and treatment guidance. We conducted a systematic review of HSI systems that have been assessed in patients, published over the past 32 years. We analysed 140 studies, including 10 different HSI systems. Current in vivo HSI systems generate a tissue oxygenation map. Tissue oxygenation measurements may help to predict those patients at risk of wound formation or delayed healing. No safety concerns were reported in any studies. A small number of studies have demonstrated the capabilities of in vivo label-free HSI, but further work is needed to fully integrate it into the current clinical workflow for different wound aetiologies. As an emerging imaging modality for medical applications, HSI offers great potential for non-invasive disease diagnosis and guidance when treating patients with both acute and chronic wounds.
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Affiliation(s)
| | | | | | | | - David Armstrong
- Keck School of Medicine, University of Southern California, Los Angeles, California, California, Canada
| | - Keith Harding
- School of Medicine, Cardiff University, Wales, UK.,A*STAR, Singapore
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9
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Zhang Y, Lei H, Zhu S, Li W, Lin J, Zhang J, Li Y, Jin P. In vivo monitoring of rashes caused by systemic lupus erythematosus disease using snapshot spectral imaging. JOURNAL OF BIOPHOTONICS 2020; 13:e201960067. [PMID: 31868301 DOI: 10.1002/jbio.201960067] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/01/2019] [Revised: 12/16/2019] [Accepted: 12/19/2019] [Indexed: 06/10/2023]
Abstract
Monitoring the activity of systemic lupus erythematosus (SLE) is important to patient management. Blood biochemical indexes are commonly assessed but are both time demanding and traumatizing. In this study, a noninvasive and real-time spatial-spectral data tool was used to monitor SLE patients through rash spectral data. To build the relationship between the rash spectrum changes and changes in the patients' status, a snapshot hyperspectral Fourier transform imaging spectrometer was built to monitor the rash reflectance changes of hospitalized SLE patients. A simple rash activity index (RAI) which was normally distributed with the doctor's visual rating of rash severity was calculated from hyperspectral images. The sensitivity of the change in RAI is higher than complement 3/4 levels. RAI and anti-dsDNA antibodies both decreased as the patients recovered. Anti-dsDNA and complement 3/4 were important indicators of SLE activity suggesting that the RAI directly correlated with patient status. The snapshot spectrometer therefore provides an auxiliary method to monitor SLE disease.
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Affiliation(s)
- Yu Zhang
- Center of Ultra-precision Optoelectronic Instrument Engineering, Harbin Institute of Technology, Harbin, China
| | - Hongwei Lei
- Department of Rheumatology and Immunology, Second Affiliated Hospital of Harbin Medical University, Harbin, China
| | - Shuaishuai Zhu
- Center of Ultra-precision Optoelectronic Instrument Engineering, Harbin Institute of Technology, Harbin, China
| | - Wei Li
- Department of Rheumatology and Immunology, Second Affiliated Hospital of Harbin Medical University, Harbin, China
| | - Jie Lin
- Center of Ultra-precision Optoelectronic Instrument Engineering, Harbin Institute of Technology, Harbin, China
| | - Jianlong Zhang
- Institute of Optical Target Simulation and Testing Technology, Harbin Institute of Technology, Harbin, China
| | - Yang Li
- Department of Rheumatology and Immunology, Second Affiliated Hospital of Harbin Medical University, Harbin, China
| | - Peng Jin
- Center of Ultra-precision Optoelectronic Instrument Engineering, Harbin Institute of Technology, Harbin, China
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Shirshin EA, Gurfinkel YI, Matskeplishvili ST, Sasonko ML, Omelyanenko NP, Yakimov BP, Lademann J, Darvin ME. In vivo optical imaging of the viable epidermis around the nailfold capillaries for the assessment of heart failure severity in humans. JOURNAL OF BIOPHOTONICS 2018; 11:e201800066. [PMID: 29845751 DOI: 10.1002/jbio.201800066] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/27/2018] [Accepted: 05/22/2018] [Indexed: 05/03/2023]
Abstract
Heart failure (HF) is among the socially significant diseases, involving over 2% of the adult population in the developed countries. Diagnostics of the HF severity remains complicated due to the absence of specific symptoms and objective criteria. Here, we present an indicator of the HF severity based on the imaging of tissue parameters around the nailfold capillaries. High resolution nailfold video capillaroscopy was performed to determine the perivascular zone (PZ) size around nailfold capillaries, and 2-photon tomography with fluorescence lifetime imaging was used to investigate PZ composition. We found that the size of PZ around the nailfold capillaries strongly correlates with HF severity. Further investigations using 2-photon tomography demonstrated that PZ corresponds to the border of viable epidermis and it was suggested that the PZ size variations were due to the different amounts of interstitial fluid that potentially further translates in clinically significant oedema. The obtained results allow for the development of a quantitative indicator of oedematous syndrome, which can be used in various applications to monitor the dynamics of interstitial fluid retention. We therefore suggest PZ size measured with nailfold video capillaroscopy as a novel quantitative sensitive non-invasive marker of HF severity.
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Affiliation(s)
- Evgeny A Shirshin
- Faculty of Physics, Lomonosov Moscow State University, Moscow, Russia
- Institute of spectroscopy of the Russian Academy of Sciences, Troitsk, Moscow, Russia
| | - Yury I Gurfinkel
- Research Clinical Center of JSC "Russian Railways", Moscow, Russia
- Lomonosov Moscow State University Clinic, Moscow, Russia
| | | | - Maria L Sasonko
- Research Clinical Center of JSC "Russian Railways", Moscow, Russia
| | | | - Boris P Yakimov
- Faculty of Physics, Lomonosov Moscow State University, Moscow, Russia
| | - Juergen Lademann
- Charité - Universitätsmedizin Berlin, corporate member of Freie Universität Berlin, Humboldt-Universität zu Berlin, and Berlin Institute of Health, Department of Dermatology, Venerology and Allergology, Center of Experimental and Applied Cutaneous Physiology, Berlin, Germany
| | - Maxim E Darvin
- Charité - Universitätsmedizin Berlin, corporate member of Freie Universität Berlin, Humboldt-Universität zu Berlin, and Berlin Institute of Health, Department of Dermatology, Venerology and Allergology, Center of Experimental and Applied Cutaneous Physiology, Berlin, Germany
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Ponticorvo A, Burmeister DM, Rowland R, Baldado M, Kennedy GT, Saager R, Bernal N, Choi B, Durkin AJ. Quantitative long-term measurements of burns in a rat model using Spatial Frequency Domain Imaging (SFDI) and Laser Speckle Imaging (LSI). Lasers Surg Med 2017; 49:293-304. [PMID: 28220508 DOI: 10.1002/lsm.22647] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 01/25/2017] [Indexed: 01/05/2023]
Abstract
BACKGROUND AND OJECTIVES The current standard for diagnosis of burn severity and subsequent wound healing is through clinical examination, which is highly subjective. Several new technologies are shifting focus to burn care in an attempt to help quantify not only burn depth but also the progress of healing. While accurate early assessment of partial thickness burns is critical for dictating the course of treatment, the ability to quantitatively monitor wound status over time is critical for understanding treatment efficacy. SFDI and LSI are both non-invasive imaging modalities that have been shown to have great diagnostic value for burn severity, but have yet to be tested over the course of wound healing. METHODS In this study, a hairless rat model (n = 6, 300-450 g) was used with a four pronged comb to create four identical partial thickness burns (superficial n = 3 and deep n = 3) that were used to monitor wound healing over a 28 days period. Weekly biopsies were taken for histological analysis to verify wound progression. Both SFDI and LSI were performed weekly to track the evolution of hemodynamic (blood flow and oxygen saturation) and structural (reduced scattering coefficient) properties for the burns. RESULTS LSI showed significant changes in blood flow from baseline to 220% in superficial and 165% in deep burns by day 7. In superficial burns, blood flow returned to baseline levels by day 28, but not for deep burns where blood flow remained elevated. Smaller increases in blood flow were also observed in the surrounding tissue over the same time period. Oxygen saturation values measured with SFDI showed a progressive increase from baseline values of 66-74% in superficial burns and 72% in deep burns by day 28. Additionally, SFDI showed significant decreases in the reduced scattering coefficient shortly after the burns were created. The scattering coefficient progressively decreased in the wound area, but returned towards baseline conditions at the end of the 28 days period. Scattering changes in the surrounding tissue remained constant despite the presence of hemodynamic changes. CONCLUSIONS Here, we show that LSI and SFDI are capable of monitoring changes in hemodynamic and scattering properties in burn wounds over a 28 days period. These results highlight the potential insights that can be gained by using non-invasive imaging technologies to study wound healing. Further development of these technologies could be revolutionary for wound monitoring and studying the efficacy of different treatments. Lasers Surg. Med. 49:293-304, 2017. © 2017 Wiley Periodicals, Inc.
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Affiliation(s)
- Adrien Ponticorvo
- Beckman Laser Institute Medical Clinic, University of California, Irvine, 1002 Health Sciences Road East, Irvine, California 92617
| | - David M Burmeister
- United States Army Institute of Surgical Research, 36950 Chambers Pass, Fort Sam Houston, Texas 78234
| | - Rebecca Rowland
- Beckman Laser Institute Medical Clinic, University of California, Irvine, 1002 Health Sciences Road East, Irvine, California 92617
| | - Melissa Baldado
- Beckman Laser Institute Medical Clinic, University of California, Irvine, 1002 Health Sciences Road East, Irvine, California 92617
| | - Gordon T Kennedy
- Beckman Laser Institute Medical Clinic, University of California, Irvine, 1002 Health Sciences Road East, Irvine, California 92617
| | - Rolf Saager
- Beckman Laser Institute Medical Clinic, University of California, Irvine, 1002 Health Sciences Road East, Irvine, California 92617
| | - Nicole Bernal
- Department of Surgery, UC Irvine Regional Burn Center, 333 City Boulevard West, Suite 705, Orange, California 92868
| | - Bernard Choi
- Beckman Laser Institute Medical Clinic, University of California, Irvine, 1002 Health Sciences Road East, Irvine, California 92617.,Department of Biomedical Engineering, University of California, Irvine, 3120 Natural Sciences II, Irvine, California 92697
| | - Anthony J Durkin
- Beckman Laser Institute Medical Clinic, University of California, Irvine, 1002 Health Sciences Road East, Irvine, California 92617
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12
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Single amino acid replacement transforms mCherry to a far-red fluorescent protein. BIOTECHNOL BIOPROC E 2017. [DOI: 10.1007/s12257-016-0402-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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13
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Kim S, Cho D, Kim J, Kim M, Youn S, Jang JE, Je M, Lee DH, Lee B, Farkas DL, Hwang JY. Smartphone-based multispectral imaging: system development and potential for mobile skin diagnosis. BIOMEDICAL OPTICS EXPRESS 2016; 7:5294-5307. [PMID: 28018743 PMCID: PMC5175570 DOI: 10.1364/boe.7.005294] [Citation(s) in RCA: 26] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/01/2016] [Revised: 10/27/2016] [Accepted: 11/20/2016] [Indexed: 05/08/2023]
Abstract
We investigate the potential of mobile smartphone-based multispectral imaging for the quantitative diagnosis and management of skin lesions. Recently, various mobile devices such as a smartphone have emerged as healthcare tools. They have been applied for the early diagnosis of nonmalignant and malignant skin diseases. Particularly, when they are combined with an advanced optical imaging technique such as multispectral imaging and analysis, it would be beneficial for the early diagnosis of such skin diseases and for further quantitative prognosis monitoring after treatment at home. Thus, we demonstrate here the development of a smartphone-based multispectral imaging system with high portability and its potential for mobile skin diagnosis. The results suggest that smartphone-based multispectral imaging and analysis has great potential as a healthcare tool for quantitative mobile skin diagnosis.
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Affiliation(s)
- Sewoong Kim
- Department of Information and Communication Engineering, Daegu Gyeongbuk Institute of Science & Technology, Daegu, 42988, South Korea
| | - Dongrae Cho
- Department of Biomedical Science and Engineering, Gwangju Institute of Science & Technology, Gwangju, 61005, South Korea
| | - Jihun Kim
- Department of Information and Communication Engineering, Daegu Gyeongbuk Institute of Science & Technology, Daegu, 42988, South Korea
| | - Manjae Kim
- Department of Information and Communication Engineering, Daegu Gyeongbuk Institute of Science & Technology, Daegu, 42988, South Korea
| | - Sangyeon Youn
- Department of Information and Communication Engineering, Daegu Gyeongbuk Institute of Science & Technology, Daegu, 42988, South Korea
| | - Jae Eun Jang
- Department of Information and Communication Engineering, Daegu Gyeongbuk Institute of Science & Technology, Daegu, 42988, South Korea
| | - Minkyu Je
- Department of Electrical Engineering, Korea Advanced Institute of Science & Technology, Daejeon, 34141, South Korea
| | - Dong Hun Lee
- Department of Dermatology, Seoul National University, Seoul, 03080, South Korea
| | - Boreom Lee
- Department of Biomedical Science and Engineering, Gwangju Institute of Science & Technology, Gwangju, 61005, South Korea
| | - Daniel L. Farkas
- Spectral Molecular Imaging, Inc., California 90211, USA
- Department of Biomedical Engineering, University of Southern California, California 90089, USA
| | - Jae Youn Hwang
- Department of Information and Communication Engineering, Daegu Gyeongbuk Institute of Science & Technology, Daegu, 42988, South Korea
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14
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Moreno M, Gelabert R, Lluch JM. The Quest for Photoswitches Activated by Near-Infrared Light: A Theoretical Study of the Photochemistry of BF2-Coordinated Azo Derivatives. Chemphyschem 2016; 17:2824-38. [DOI: 10.1002/cphc.201600543] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/23/2016] [Indexed: 11/10/2022]
Affiliation(s)
- Miquel Moreno
- Departament de Química; Universitat Autònoma de Barcelona; 08193 Bellaterra Barcelona Spain
| | - Ricard Gelabert
- Departament de Química; Universitat Autònoma de Barcelona; 08193 Bellaterra Barcelona Spain
| | - José M. Lluch
- Departament de Químic and Institut de Biotecnologia i Biomedicina; Universitat Autònoma de Barcelona; 08193 Bellaterra Barcelona Spain
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15
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Armengol P, Gelabert R, Moreno M, Lluch JM. Chromophore interactions leading to different absorption spectra in mNeptune1 and mCardinal red fluorescent proteins. Phys Chem Chem Phys 2016; 18:16964-76. [PMID: 27294977 DOI: 10.1039/c6cp01297c] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2023]
Abstract
Extensive MD simulations combined with QM/MM calculations have been performed on mNeptune1 and mCardinal red fluorescent proteins to establish the reasons behind the red shift of the excitation wavelength of mCardinal with respect to mNeptune1. In both cases, it is seen that Arg197 stabilizes the chromophore but cannot be described as stabilizing preferentially the excited state because of the anchor point of the interaction. The interactions of the linking bonds to the α-helix of both proteins to the chromophore have been analyzed. It has been found that, besides the presence of a strategically placed residue Gln41 in mCardinal, solvation water molecules play an active role in the energetics of the stabilization of the excited state, which is preferentially stabilized in the case of mCardinal in contrast to mNeptune1.
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Affiliation(s)
- Pau Armengol
- Departament de Química, Universitat Autònoma de Barcelona, 08193 Bellaterra, Barcelona, Spain.
| | - Ricard Gelabert
- Departament de Química, Universitat Autònoma de Barcelona, 08193 Bellaterra, Barcelona, Spain.
| | - Miquel Moreno
- Departament de Química, Universitat Autònoma de Barcelona, 08193 Bellaterra, Barcelona, Spain.
| | - José M Lluch
- Departament de Química, Universitat Autònoma de Barcelona, 08193 Bellaterra, Barcelona, Spain. and Institut de Biotecnologia i de Biomedicina, Universitat Autònoma de Barcelona, 08193 Bellaterra, Barcelona, Spain
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16
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Rincon K, Shah P, Ramella-Roman J, Bhansali S. A Review of Engineering Approaches for Lymphedema Detection. IEEE Rev Biomed Eng 2016; 9:79-90. [PMID: 27333610 DOI: 10.1109/rbme.2016.2582178] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Abstract
Edema is a condition characterized by excessive swelling of a tissue due to an abnormal accumulation of interstitial fluid in the subcutaneous tissue. More specifically, disruption of the lymphatic system causes what is known as lymphedema. This condition is commonly seen in breast cancer survivors postradiotherapy treatment, chemotherapy, and surgeries; this population has shown high risk of developing lymphedema in the limbs. Throughout the years, several techniques have been developed and implemented for the detection and measurement of lymphedema, including techniques to measure the diseased limb volume, electrical techniques to measure the water content in tissues, and optical techniques to measure either tissue absorbance or limb volume. However, there is still no method that allows for continuous monitoring of the disease and provides a better understanding of its progression. This study describes the different approaches that have been used and that could be used for lymphedema measurement.
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17
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Huang J, Milton A, Arnold RD, Huang H, Smith F, Panizzi JR, Panizzi P. Methods for measuring myeloperoxidase activity toward assessing inhibitor efficacy in living systems. J Leukoc Biol 2016; 99:541-8. [PMID: 26884610 DOI: 10.1189/jlb.3ru0615-256r] [Citation(s) in RCA: 36] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/16/2015] [Accepted: 01/11/2016] [Indexed: 12/23/2022] Open
Abstract
Myeloperoxidase aids in clearance of microbes by generation of peroxidase-mediated oxidants that kill leukocyte-engulfed pathogens. In this review, we will examine 1) strategies for in vitro evaluation of myeloperoxidase function and its inhibition, 2) ways to monitor generation of certain oxidant species during inflammation, and 3) how these methods can be used to approximate the total polymorphonuclear neutrophil chemotaxis following insult. Several optical imaging probes are designed to target reactive oxygen and nitrogen species during polymorphonuclear neutrophil inflammatory burst following injury. Here, we review the following 1) the broad effect of myeloperoxidase on normal physiology, 2) the difference between myeloperoxidase and other peroxidases, 3) the current optical probes available for use as surrogates for direct measures of myeloperoxidase-derived oxidants, and 4) the range of preclinical options for imaging myeloperoxidase accumulation at sites of inflammation in mice. We also stress the advantages and drawbacks of each of these methods, the pharmacokinetic considerations that may limit probe use to strictly cell cultures for some reactive oxygen and nitrogen species, rather than in vivo utility as indicators of myeloperoxidase function. Taken together, our review should shed light on the fundamental rational behind these techniques for measuring myeloperoxidase activity and polymorphonuclear neutrophil response after injury toward developing safe myeloperoxidase inhibitors as potential therapy for chronic obstructive pulmonary disease and rheumatoid arthritis.
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Affiliation(s)
- Jiansheng Huang
- *Department of Drug Discovery and Development, Harrison School of Pharmacy, Auburn University, Auburn, Alabama, USA Department of Anatomy, Physiology and Pharmacology, College of Veterinary Medicine, Auburn University, Auburn, Alabama, USA
| | - Amber Milton
- *Department of Drug Discovery and Development, Harrison School of Pharmacy, Auburn University, Auburn, Alabama, USA Department of Anatomy, Physiology and Pharmacology, College of Veterinary Medicine, Auburn University, Auburn, Alabama, USA
| | - Robert D Arnold
- *Department of Drug Discovery and Development, Harrison School of Pharmacy, Auburn University, Auburn, Alabama, USA Department of Anatomy, Physiology and Pharmacology, College of Veterinary Medicine, Auburn University, Auburn, Alabama, USA
| | - Hui Huang
- *Department of Drug Discovery and Development, Harrison School of Pharmacy, Auburn University, Auburn, Alabama, USA Department of Anatomy, Physiology and Pharmacology, College of Veterinary Medicine, Auburn University, Auburn, Alabama, USA
| | - Forrest Smith
- *Department of Drug Discovery and Development, Harrison School of Pharmacy, Auburn University, Auburn, Alabama, USA Department of Anatomy, Physiology and Pharmacology, College of Veterinary Medicine, Auburn University, Auburn, Alabama, USA
| | - Jennifer R Panizzi
- *Department of Drug Discovery and Development, Harrison School of Pharmacy, Auburn University, Auburn, Alabama, USA Department of Anatomy, Physiology and Pharmacology, College of Veterinary Medicine, Auburn University, Auburn, Alabama, USA
| | - Peter Panizzi
- *Department of Drug Discovery and Development, Harrison School of Pharmacy, Auburn University, Auburn, Alabama, USA Department of Anatomy, Physiology and Pharmacology, College of Veterinary Medicine, Auburn University, Auburn, Alabama, USA
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18
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Randino C, Gelabert R, Moreno M, Lluch JM, Piatkevich KD. Molecular modelling of the pH influence in the geometry and the absorbance spectrum of near-infrared TagRFP675 fluorescent protein. Phys Chem Chem Phys 2015; 17:29363-73. [PMID: 26473582 DOI: 10.1039/c5cp04428f] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Classical molecular dynamics (MD) simulations are carried out for the recently developed TagRFP675 fluorescent protein (FP), which is specifically designed to fully absorb and emit in the near infrared (NIR) region of the electromagnetic spectrum. Since the X-ray data of TagRFP675 reveal that the chromophore exists in both the cis and trans configuration and it can also be neutral (protonated) or anionic (deprotonated) depending on the pH of the media, a total of 8 molecular dynamic simulations have been run to simulate all the possible states of the chromophore. Time-dependent DFT (TDDFT) single point calculations are performed at selected points along the simulation to theoretically mimic the absorption spectrum of the protein. Our simulations compare well (within the expected error of the computational method) with the experimental results. Our theoretical procedure allows for an analysis of the molecular orbitals involved in the lowest energy electronic excitations of the chromophore and, more interestingly, for a full analysis of the H-bond interactions between the chromophore and its surrounding residues and solvent (water) molecules. This study does not support the hypothesis, exclusively based on the analysis of X-ray data, that the isomerization of nearby residues provokes the rearrangement of the hydrogen bonds in the chromophore's immediate environment leading to the observed red shift of the absorption bands at higher pHs. Instead, we attribute this shift mainly to the superposition of bands of the neutral and anionic chromophores that are expected to coexist at almost the full range of pHs experimentally analyzed. An additional factor that could contribute to this shift is the experimentally observed increase of the cis configuration of the chromophore at higher pHs.
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Affiliation(s)
- Carlos Randino
- Departament de Química, Universitat Autònoma de Barcelona, 08193 Bellaterra, Barcelona, Spain.
| | - Ricard Gelabert
- Departament de Química, Universitat Autònoma de Barcelona, 08193 Bellaterra, Barcelona, Spain.
| | - Miquel Moreno
- Departament de Química, Universitat Autònoma de Barcelona, 08193 Bellaterra, Barcelona, Spain.
| | - José M Lluch
- Departament de Química, Universitat Autònoma de Barcelona, 08193 Bellaterra, Barcelona, Spain. and Institut de Biotecnologia i de Biomedicina, Universitat Autònoma de Barcelona, 08193 Bellaterra, Barcelona, Spain
| | - Kiryl D Piatkevich
- Departments of Biological Engineering and Brain and Cognitive Sciences, Massachusetts Institute of Technology, Cambridge, MA 02139, USA
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19
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Miller KE, Kim Y, Huh WK, Park HO. Bimolecular Fluorescence Complementation (BiFC) Analysis: Advances and Recent Applications for Genome-Wide Interaction Studies. J Mol Biol 2015; 427:2039-2055. [PMID: 25772494 DOI: 10.1016/j.jmb.2015.03.005] [Citation(s) in RCA: 164] [Impact Index Per Article: 18.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/28/2015] [Revised: 03/04/2015] [Accepted: 03/05/2015] [Indexed: 12/09/2022]
Abstract
Complex protein networks are involved in nearly all cellular processes. To uncover these vast networks of protein interactions, various high-throughput screening technologies have been developed. Over the last decade, bimolecular fluorescence complementation (BiFC) assay has been widely used to detect protein-protein interactions (PPIs) in living cells. This technique is based on the reconstitution of a fluorescent protein in vivo. Easy quantification of the BiFC signals allows effective cell-based high-throughput screenings for protein binding partners and drugs that modulate PPIs. Recently, with the development of large screening libraries, BiFC has been effectively applied for genome-wide PPI studies and has uncovered novel protein interactions, providing new insight into protein functions. In this review, we describe the development of reagents and methods used for BiFC-based screens in yeast, plants, and mammalian cells. We also discuss the advantages and drawbacks of these methods and highlight the application of BiFC in large-scale studies.
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Affiliation(s)
- Kristi E Miller
- Molecular Cellular Developmental Biology Program, Ohio State University, OH, USA
| | - Yeonsoo Kim
- Department of Biological Sciences, Seoul National University, Seoul 151-747, Korea
| | - Won-Ki Huh
- Department of Biological Sciences, Seoul National University, Seoul 151-747, Korea
| | - Hay-Oak Park
- Molecular Cellular Developmental Biology Program, Ohio State University, OH, USA
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20
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Huang J, Zhang S, Gnyawali S, Sen CK, Xu RX. Second derivative multispectral algorithm for quantitative assessment of cutaneous tissue oxygenation. JOURNAL OF BIOMEDICAL OPTICS 2015; 20:036001. [PMID: 25734405 PMCID: PMC4347514 DOI: 10.1117/1.jbo.20.3.036001] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/05/2014] [Accepted: 01/20/2015] [Indexed: 05/12/2023]
Abstract
We report a second derivative multispectral algorithm for quantitative assessment of cutaneous tissue oxygen saturation (StO₂). The algorithm is based on a forward model of light transport in multilayered skin tissue and an inverse algorithm for StO₂ reconstruction. Based on the forward simulation results, a parameter of a second derivative ratio (SDR) is derived as a function of cutaneous tissue StO₂. The SDR function is optimized at a wavelength set of 544, 552, 568, 576, 592, and 600 nm so that cutaneous tissue StO₂ can be derived with minimal artifacts by blood concentration, tissue scattering, and melanin concentration. The proposed multispectral StO₂ imaging algorithm is verified in both benchtop and in vivo experiments. The experimental results show that the proposed multispectral imaging algorithm is able to map cutaneous tissue StO₂ in high temporal resolution with reduced measurement artifacts induced by different skin conditions in comparison with other three commercial tissue oxygen measurement systems. These results indicate that the multispectral StO₂ imaging technique has the potential for noninvasive and quantitative assessment of skin tissue oxygenation with a high temporal resolution.
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Affiliation(s)
- Jiwei Huang
- The Ohio State University, Department of Biomedical Engineering, Columbus, Ohio 43210, United States
| | - Shiwu Zhang
- University of Science and Technology of China, Department of Precision Machinery and Precision Instrumentation, Hefei, Anhui 230027, China
| | - Surya Gnyawali
- The Ohio State University, Department of Surgery, Columbus, Ohio 43210, United States
| | - Chandan K. Sen
- The Ohio State University, Department of Surgery, Columbus, Ohio 43210, United States
| | - Ronald X. Xu
- The Ohio State University, Department of Biomedical Engineering, Columbus, Ohio 43210, United States
- University of Science and Technology of China, Department of Precision Machinery and Precision Instrumentation, Hefei, Anhui 230027, China
- Address all correspondence to: Ronald X. Xu, E-mail:
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21
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Han Y, Wang S, Zhang Z, Ma X, Li W, Zhang X, Deng J, Wei H, Li Z, Zhang XE, Cui Z. In vivo imaging of protein-protein and RNA-protein interactions using novel far-red fluorescence complementation systems. Nucleic Acids Res 2014; 42:e103. [PMID: 24813442 PMCID: PMC4117741 DOI: 10.1093/nar/gku408] [Citation(s) in RCA: 40] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022] Open
Abstract
Imaging of protein–protein and RNA–protein interactions in vivo, especially in live animals, is still challenging. Here we developed far-red mNeptune-based bimolecular fluorescence complementation (BiFC) and trimolecular fluorescence complementation (TriFC) systems with excitation and emission above 600 nm in the ‘tissue optical window’ for imaging of protein–protein and RNA–protein interactions in live cells and mice. The far-red mNeptune BiFC was first built by selecting appropriate split mNeptune fragments, and then the mNeptune-TriFC system was built based on the mNeptune-BiFC system. The newly constructed mNeptune BiFC and TriFC systems were verified as useful tools for imaging protein–protein and mRNA–protein interactions, respectively, in live cells and mice. We then used the new mNeptune-TriFC system to investigate the interactions between human polypyrimidine-tract-binding protein (PTB) and HIV-1 mRNA elements as PTB may participate in HIV mRNA processing in HIV activation from latency. An interaction between PTB and the 3′long terminal repeat region of HIV-1 mRNAs was found and imaged in live cells and mice, implying a role for PTB in regulating HIV-1 mRNA processing. The study provides new tools for in vivo imaging of RNA–protein and protein–protein interactions, and adds new insight into the mechanism of HIV-1 mRNA processing.
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Affiliation(s)
- Yu Han
- State Key Laboratory of Virology, Wuhan Institute of Virology, Chinese Academy of Sciences, Wuhan 430071, China Graduate University of Chinese Academy of Sciences, Beijing 100049, China
| | - Shifeng Wang
- State Key Laboratory of Virology, Wuhan Institute of Virology, Chinese Academy of Sciences, Wuhan 430071, China Graduate University of Chinese Academy of Sciences, Beijing 100049, China
| | - Zhiping Zhang
- State Key Laboratory of Virology, Wuhan Institute of Virology, Chinese Academy of Sciences, Wuhan 430071, China
| | - Xiaohe Ma
- State Key Laboratory of Virology, Wuhan Institute of Virology, Chinese Academy of Sciences, Wuhan 430071, China
| | - Wei Li
- State Key Laboratory of Virology, Wuhan Institute of Virology, Chinese Academy of Sciences, Wuhan 430071, China
| | - Xiaowei Zhang
- State Key Laboratory of Virology, Wuhan Institute of Virology, Chinese Academy of Sciences, Wuhan 430071, China
| | - Jiaoyu Deng
- State Key Laboratory of Virology, Wuhan Institute of Virology, Chinese Academy of Sciences, Wuhan 430071, China
| | - Hongping Wei
- State Key Laboratory of Virology, Wuhan Institute of Virology, Chinese Academy of Sciences, Wuhan 430071, China
| | - Zhaoyang Li
- State Key Laboratory of Virology, Wuhan Institute of Virology, Chinese Academy of Sciences, Wuhan 430071, China Graduate University of Chinese Academy of Sciences, Beijing 100049, China
| | - Xian-En Zhang
- State Key Laboratory of Virology, Wuhan Institute of Virology, Chinese Academy of Sciences, Wuhan 430071, China National Key Laboratory of Macrobiomolecules, Institute of Biophysics, Chinese Academy of Sciences, Beijing 100101, China
| | - Zongqiang Cui
- State Key Laboratory of Virology, Wuhan Institute of Virology, Chinese Academy of Sciences, Wuhan 430071, China
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22
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Wang H, Shi L, Qin J, Yousefi S, Li Y, Wang RK. Multimodal optical imaging can reveal changes in microcirculation and tissue oxygenation during skin wound healing. Lasers Surg Med 2014; 46:470-8. [PMID: 24788236 DOI: 10.1002/lsm.22254] [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] [Accepted: 04/02/2014] [Indexed: 11/10/2022]
Abstract
BACKGROUND AND OBJECTIVE Faster and better wound healing is a longstanding goal. Blood flow, angiogenesis, and tissue oxygenation are important parameters in evaluating the healing process. Optical microangiography (OMAG) allows 3D imaging of tissue vasculature and can provide quantitative blood flow information down to the capillary level of resolution. Dual wavelength laser speckle imaging (DW-LSI) can measure tissue oxygenation status. MATERIALS AND METHODS Cutaneous wound healing of a mouse ear model using a multimodal imaging system that combines OMAG with DWLSI was studied. RESULTS A complete microvasculature map of the ear in vivo was obtained. The imaging system revealed both hemodynamic and metabolic changes during acute stage wound healing. Blood flow velocity, blood flow direction, as well as changes in concentration of oxygenated hemoglobin (ΔHbO) and deoxygenated hemoglobin (ΔHb) were measured and quantified. In addition, capillary recruitment and angiogenesis were visualized during the chronic stage of repairing. CONCLUSIONS The combination of DW-LSI and OMAG imaging technique may be a powerful tool to visualize and understand microvascular, hemodynamic, and metabolic changes during cutaneous wound healing.
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Affiliation(s)
- Hequn Wang
- Department of Bioengineering, University of Washington, Seattle, Washington
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23
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24
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von Neubeck C, Shankaran H, Geniza MJ, Kauer PM, Robinson RJ, Chrisler WB, Sowa MB. Integrated experimental and computational approach to understand the effects of heavy ion radiation on skin homeostasis. Integr Biol (Camb) 2013; 5:1229-43. [DOI: 10.1039/c3ib40071a] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Affiliation(s)
- Claere von Neubeck
- German Cancer Consortium (DKTK), OncoRay - National Center for Radiation Research in Oncology, Medical Faculty and University Hospital Carl Gustav Carus, Technische Universität Dresden, Fetscherstrasse 74, 01307 Dresden, Germany
- German Cancer Research Center (DKFZ), Im Neuenheimer Feld 280, 69120 Heidelberg, Germany
| | - Harish Shankaran
- Computational Biology and Bioinformatics, Pacific Northwest National Laboratory, Richland, WA, USA
| | - Matthew J. Geniza
- Molecular and Cellular Biology Program, Oregon State University, Corvallis, OR, USA
| | - Paula M. Kauer
- Systems Toxicology, Pacific Northwest National Laboratory, P.O. Box 999, MS J4-02, Richland, WA 99352, USA. Fax: +1 509-371-7304; Tel: +1 509-371-6898
| | - R. Joe Robinson
- Systems Toxicology, Pacific Northwest National Laboratory, P.O. Box 999, MS J4-02, Richland, WA 99352, USA. Fax: +1 509-371-7304; Tel: +1 509-371-6898
| | - William B. Chrisler
- Systems Toxicology, Pacific Northwest National Laboratory, P.O. Box 999, MS J4-02, Richland, WA 99352, USA. Fax: +1 509-371-7304; Tel: +1 509-371-6898
| | - Marianne B. Sowa
- Systems Toxicology, Pacific Northwest National Laboratory, P.O. Box 999, MS J4-02, Richland, WA 99352, USA. Fax: +1 509-371-7304; Tel: +1 509-371-6898
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25
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Nguyen JQ, Crouzet C, Mai T, Riola K, Uchitel D, Liaw LH, Bernal N, Ponticorvo A, Choi B, Durkin AJ. Spatial frequency domain imaging of burn wounds in a preclinical model of graded burn severity. JOURNAL OF BIOMEDICAL OPTICS 2013; 18:66010. [PMID: 23764696 PMCID: PMC3680730 DOI: 10.1117/1.jbo.18.6.066010] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/02/2023]
Abstract
Frequent monitoring of early-stage burns is necessary for deciding optimal treatment and management. Both superficial and full thickness burns are relatively easy to diagnose based on clinical observation. In between these two extremes are superficial-partial thickness and deep-partial thickness burns. These burns, while visually similar, differ dramatically in terms of clinical treatment and are known to progress in severity over time. The objective of this study was to determine the potential of spatial frequency domain imaging (SFDI) for noninvasively mapping quantitative changes in chromophore and optical properties that may be an indicative of burn wound severity. A controlled protocol of graded burn severity was developed and applied to 17 rats. SFDI data was acquired at multiple near-infrared wavelengths over a course of 3 h. Burn severity was verified using hematoxylin and eosin histology. From this study, we found that changes in water concentration (edema), deoxygenated hemoglobin concentration, and optical scattering (tissue denaturation) to be statistically significant at differentiating superficial partial-thickness burns from deep-partial thickness burns.
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Affiliation(s)
- John Quan Nguyen
- Beckman Laser Institute and Medical Clinic, 1002 Health Sciences Road, Irvine, California 92617-3010
| | - Christian Crouzet
- Beckman Laser Institute and Medical Clinic, 1002 Health Sciences Road, Irvine, California 92617-3010
| | - Tuan Mai
- Beckman Laser Institute and Medical Clinic, 1002 Health Sciences Road, Irvine, California 92617-3010
| | - Kathleen Riola
- Beckman Laser Institute and Medical Clinic, 1002 Health Sciences Road, Irvine, California 92617-3010
| | - Daniel Uchitel
- Beckman Laser Institute and Medical Clinic, 1002 Health Sciences Road, Irvine, California 92617-3010
| | - Lih-Huei Liaw
- Beckman Laser Institute and Medical Clinic, 1002 Health Sciences Road, Irvine, California 92617-3010
| | - Nicole Bernal
- UC Irvine Regional Burn Center, Department of Surgery, 333 City Boulevard West, Suite 705, Orange, California 92868
| | - Adrien Ponticorvo
- Beckman Laser Institute and Medical Clinic, 1002 Health Sciences Road, Irvine, California 92617-3010
| | - Bernard Choi
- Beckman Laser Institute and Medical Clinic, 1002 Health Sciences Road, Irvine, California 92617-3010
| | - Anthony J. Durkin
- Beckman Laser Institute and Medical Clinic, 1002 Health Sciences Road, Irvine, California 92617-3010
- Address all correspondence to: Anthony J. Durkin, Beckman Laser Institute and Medical Clinic, 1002 Health Sciences Road, Irvine, California 92617-3010. Tel: (949)824-3284; E-mail:
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26
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Clancy NT, Stoyanov D, James DRC, Di Marco A, Sauvage V, Clark J, Yang GZ, Elson DS. Multispectral image alignment using a three channel endoscope in vivo during minimally invasive surgery. BIOMEDICAL OPTICS EXPRESS 2012; 3:2567-78. [PMID: 23082296 PMCID: PMC3469985 DOI: 10.1364/boe.3.002567] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/18/2012] [Revised: 09/07/2012] [Accepted: 09/11/2012] [Indexed: 05/11/2023]
Abstract
Sequential multispectral imaging is an acquisition technique that involves collecting images of a target at different wavelengths, to compile a spectrum for each pixel. In surgical applications it suffers from low illumination levels and motion artefacts. A three-channel rigid endoscope system has been developed that allows simultaneous recording of stereoscopic and multispectral images. Salient features on the tissue surface may be tracked during the acquisition in the stereo cameras and, using multiple camera triangulation techniques, this information used to align the multispectral images automatically even though the tissue or camera is moving. This paper describes a detailed validation of the set-up in a controlled experiment before presenting the first in vivo use of the device in a porcine minimally invasive surgical procedure. Multispectral images of the large bowel were acquired and used to extract the relative concentration of haemoglobin in the tissue despite motion due to breathing during the acquisition. Using the stereoscopic information it was also possible to overlay the multispectral information on the reconstructed 3D surface. This experiment demonstrates the ability of this system for measuring blood perfusion changes in the tissue during surgery and its potential use as a platform for other sequential imaging modalities.
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Affiliation(s)
- Neil T. Clancy
- Hamlyn Centre for Robotic Surgery, Institute of Global Health
Innovation, Imperial College London, SW7 2AZ, UK
- Department of Surgery and Cancer, Imperial College London, SW7
2AZ, UK
| | - Danail Stoyanov
- Centre for Medical Image Computing, Department of Computer
Science, University College London, WC1E 6BT, UK
| | - David R. C. James
- Hamlyn Centre for Robotic Surgery, Institute of Global Health
Innovation, Imperial College London, SW7 2AZ, UK
- Department of Surgery and Cancer, Imperial College London, SW7
2AZ, UK
| | - Aimee Di Marco
- Hamlyn Centre for Robotic Surgery, Institute of Global Health
Innovation, Imperial College London, SW7 2AZ, UK
- Department of Surgery and Cancer, Imperial College London, SW7
2AZ, UK
| | - Vincent Sauvage
- Hamlyn Centre for Robotic Surgery, Institute of Global Health
Innovation, Imperial College London, SW7 2AZ, UK
- Department of Surgery and Cancer, Imperial College London, SW7
2AZ, UK
| | - James Clark
- Hamlyn Centre for Robotic Surgery, Institute of Global Health
Innovation, Imperial College London, SW7 2AZ, UK
- Department of Surgery and Cancer, Imperial College London, SW7
2AZ, UK
| | - Guang-Zhong Yang
- Hamlyn Centre for Robotic Surgery, Institute of Global Health
Innovation, Imperial College London, SW7 2AZ, UK
- Department of Computing, Imperial College London, SW7 2AZ,
UK
| | - Daniel S. Elson
- Hamlyn Centre for Robotic Surgery, Institute of Global Health
Innovation, Imperial College London, SW7 2AZ, UK
- Department of Surgery and Cancer, Imperial College London, SW7
2AZ, UK
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27
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Laboratory calibration of a field imaging spectrometer system. SENSORS 2011; 11:2408-25. [PMID: 22163746 PMCID: PMC3231591 DOI: 10.3390/s110302408] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 12/09/2010] [Revised: 01/19/2011] [Accepted: 02/15/2011] [Indexed: 12/03/2022]
Abstract
A new Field Imaging Spectrometer System (FISS) based on a cooling area CCD was developed. This paper describes the imaging principle, structural design, and main parameters of the FISS sensor. The FISS was spectrally calibrated with a double grating monochromator to determine the center wavelength and FWHM of each band. Calibration results showed that the spectral range of the FISS system is 437–902 nm, the number of channels is 344 and the spectral resolution of each channel is better than 5 nm. An integrating sphere was used to achieve absolute radiometric calibration of the FISS with less than 5% calibration error for each band. There are 215 channels with signal to noise ratios (SNRs) greater than 500 (62.5% of the bands). The results demonstrated that the FISS has achieved high performance that assures the feasibility of its practical use in various fields.
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28
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Nishidate I, Tanaka N, Kawase T, Maeda T, Yuasa T, Aizu Y, Yuasa T, Niizeki K. Noninvasive imaging of human skin hemodynamics using a digital red-green-blue camera. JOURNAL OF BIOMEDICAL OPTICS 2011; 16:086012. [PMID: 21895324 DOI: 10.1117/1.3613929] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
Abstract
In order to visualize human skin hemodynamics, we investigated a method that is specifically developed for the visualization of concentrations of oxygenated blood, deoxygenated blood, and melanin in skin tissue from digital RGB color images. Images of total blood concentration and oxygen saturation can also be reconstructed from the results of oxygenated and deoxygenated blood. Experiments using tissue-like agar gel phantoms demonstrated the ability of the developed method to quantitatively visualize the transition from an oxygenated blood to a deoxygenated blood in dermis. In vivo imaging of the chromophore concentrations and tissue oxygen saturation in the skin of the human hand are performed for 14 subjects during upper limb occlusion at 50 and 250 mm Hg. The response of the total blood concentration in the skin acquired by this method and forearm volume changes obtained from the conventional strain-gauge plethysmograph were comparable during the upper arm occlusion at pressures of both 50 and 250 mm Hg. The results presented in the present paper indicate the possibility of visualizing the hemodynamics of subsurface skin tissue.
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Affiliation(s)
- Izumi Nishidate
- Tokyo University of Agriculture & Technology, Graduate School of Bioapplications and Science Engineering, Koganei, Tokyo 184-8588, Japan.
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29
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Bakayan A, Vaquero CF, Picazo F, Llopis J. Red fluorescent protein-aequorin fusions as improved bioluminescent Ca2+ reporters in single cells and mice. PLoS One 2011; 6:e19520. [PMID: 21589654 PMCID: PMC3092744 DOI: 10.1371/journal.pone.0019520] [Citation(s) in RCA: 40] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/11/2010] [Accepted: 04/08/2011] [Indexed: 11/18/2022] Open
Abstract
Bioluminescence recording of Ca(2+) signals with the photoprotein aequorin does not require radiative energy input and can be measured with a low background and good temporal resolution. Shifting aequorin emission to longer wavelengths occurs naturally in the jellyfish Aequorea victoria by bioluminescence resonance energy transfer (BRET) to the green fluorescent protein (GFP). This process has been reproduced in the molecular fusions GFP-aequorin and monomeric red fluorescent protein (mRFP)-aequorin, but the latter showed limited transfer efficiency. Fusions with strong red emission would facilitate the simultaneous imaging of Ca(2+) in various cell compartments. In addition, they would also serve to monitor Ca(2+) in living organisms since red light is able to cross animal tissues with less scattering. In this study, aequorin was fused to orange and various red fluorescent proteins to identify the best acceptor in red emission bands. Tandem-dimer Tomato-aequorin (tdTA) showed the highest BRET efficiency (largest energy transfer critical distance R(0)) and percentage of counts in the red band of all the fusions studied. In addition, red fluorophore maturation of tdTA within cells was faster than that of other fusions. Light output was sufficient to image ATP-induced Ca(2+) oscillations in single HeLa cells expressing tdTA. Ca(2+) rises caused by depolarization of mouse neuronal cells in primary culture were also recorded, and changes in fine neuronal projections were spatially resolved. Finally, it was also possible to visualize the Ca(2+) activity of HeLa cells injected subcutaneously into mice, and Ca(2+) signals after depositing recombinant tdTA in muscle or the peritoneal cavity. Here we report that tdTA is the brightest red bioluminescent Ca(2+) sensor reported to date and is, therefore, a promising probe to study Ca(2+) dynamics in whole organisms or tissues expressing the transgene.
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Affiliation(s)
- Adil Bakayan
- Facultad de Medicina and Centro Regional de Investigaciones Biomédicas (CRIB), University of Castilla-La Mancha, Albacete, Spain
| | - Cecilia F. Vaquero
- Facultad de Medicina and Centro Regional de Investigaciones Biomédicas (CRIB), University of Castilla-La Mancha, Albacete, Spain
| | - Fernando Picazo
- Facultad de Medicina and Centro Regional de Investigaciones Biomédicas (CRIB), University of Castilla-La Mancha, Albacete, Spain
| | - Juan Llopis
- Facultad de Medicina and Centro Regional de Investigaciones Biomédicas (CRIB), University of Castilla-La Mancha, Albacete, Spain
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30
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Nishino K, Nakamura M, Matsumoto M, Tanno O, Nakauchi S. Optical filter highlighting spectral features part II: quantitative measurements of cosmetic foundation and assessment of their spatial distributions under realistic facial conditions. OPTICS EXPRESS 2011; 19:6031-6041. [PMID: 21451627 DOI: 10.1364/oe.19.006031] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/30/2023]
Abstract
We previously proposed a filter that could detect cosmetic foundations with high discrimination accuracy [Opt. Express 19, 6020 (2011)]. This study extends the filter's functionality to the quantification of the amount of foundation and applies the filter for the assessment of spatial distributions of foundation under realistic facial conditions. Human faces that are applied with quantitatively controlled amounts of cosmetic foundations were measured using the filter. A calibration curve between pixel values of the image and the amount of foundation was created. The optical filter was applied to visualize spatial foundation distributions under realistic facial conditions, which clearly indicated areas on the face where foundation remained even after cleansing. Results confirm that the proposed filter could visualize and nondestructively inspect the foundation distributions.
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Affiliation(s)
- Ken Nishino
- Department of Computer Science and Engineering, Toyohashi University of Technology, Toyohashi, Aichi, Japan.
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31
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Nishino K, Nakamura M, Matsumoto M, Tanno O, Nakauchi S. Optical filter for highlighting spectral features part I: design and development of the filter for discrimination of human skin with and without an application of cosmetic foundation. OPTICS EXPRESS 2011; 19:6020-6030. [PMID: 21451626 DOI: 10.1364/oe.19.006020] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/30/2023]
Abstract
Light reflected from an object's surface contains much information about its physical and chemical properties. Changes in the physical properties of an object are barely detectable in spectra. Conventional trichromatic systems, on the other hand, cannot detect most spectral features because spectral information is compressively represented as trichromatic signals forming a three-dimensional subspace. We propose a method for designing a filter that optically modulates a camera's spectral sensitivity to find an alternative subspace highlighting an object's spectral features more effectively than the original trichromatic space. We designed and developed a filter that detects cosmetic foundations on human face. Results confirmed that the filter can visualize and nondestructively inspect the foundation distribution.
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Affiliation(s)
- Ken Nishino
- Department of Computer Science and Engineering, Toyohashi University of Technology, Toyohashi, Aichi, Japan.
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32
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Yi D, Wang C, Qi H, Kong L, Wang F, Adibi A. Real-time multispectral imager for home-based health care. IEEE Trans Biomed Eng 2010; 58:736-40. [PMID: 20876006 DOI: 10.1109/tbme.2010.2077637] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Abstract
Multispectral imaging (MSI) is becoming a powerful tool for tissue abnormality detection. Conventional MSI systems, however, are not readily suitable for challenges of routine clinical uses due to the fact that they are expensive, bulky, and time consuming to acquire the data. In this letter we report a novel approach to instrument MSI technology into a handheld, low-cost, standing-alone, real-time operational device that is suitable for home-based health care. It covers techniques used to produce multiple images at discrete signature wavelengths of tissues with a single shot.
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Affiliation(s)
- Dingrong Yi
- Imaging Research, Research Institute, Sunnybrook Health Sciences Center, Toronto M4N 3M5, ON Canada.
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33
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Yuan Z, Zakhaleva J, Ren H, Liu J, Chen W, Pan Y. Noninvasive and high-resolution optical monitoring of healing of diabetic dermal excisional wounds implanted with biodegradable in situ gelable hydrogels. Tissue Eng Part C Methods 2010; 16:237-47. [PMID: 19496703 DOI: 10.1089/ten.tec.2009.0152] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Abstract
Closure of diabetic dermal chronic wounds remains a clinical challenge. Implant-assisted healing is emerging as a potential class of therapy for dermal wound closure; this advancement has not been paralleled by the development in complementary diagnostic techniques to objectively monitor the wound-healing process in conjunction with assessing/monitoring of implant efficacy. Biopsies provide the most objective morphological assessments of wound healing; however, they not only perpetuate the wound presence but also increase the risk of infection. A noninvasive and high-resolution imaging technique is highly desirable to provide objective longitudinal diagnosis of implant-assisted wound healing. We investigated the feasibility of deploying optical coherence tomography (OCT) for noninvasive monitoring of the healing of full-thickness excisional dermal wounds implanted with a novel in situ gelable hydrogel composed of N-carboxyethyl chitosan, oxidized dextran, and hyaluronan, in both normal and db/db mice. The results showed that OCT was able to differentiate the morphological differences (e.g., thickness of dermis) between normal and diabetic mice as validated by their corresponding histological evaluations (p < 0.05). OCT could detect essential morphological changes during wound healing, including re-epithelization, inflammatory response, and granulation tissue formation as well as impaired wound repair in diabetic mice. Importantly, by tracking specific morphological changes in hydrogel-assisted wound healing (e.g., implants' degradation and resorption, cell-mediated hydrogel degradation, and accelerated re-epithelization), OCT could also be deployed to monitor and evaluate the transformation of implanted biomaterials, thus holding the promise for noninvasive and objective monitoring of wound healing longitudinally and for objective efficacy assessment of implantable therapeutics in tissue engineering.
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Affiliation(s)
- Zhijia Yuan
- Department of Biomedical Engineering, State University of New York at Stony Brook, Stony Brook, New York 11794-8181, USA
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34
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Basiri A, Nabili M, Mathews S, Libin A, Groah S, Noordmans HJ, Ramella-Roman JC. Use of a multi-spectral camera in the characterization of skin wounds. OPTICS EXPRESS 2010; 18:3244-57. [PMID: 20389332 DOI: 10.1364/oe.18.003244] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/07/2023]
Abstract
Skin breakdown is a prevalent and costly medical condition worldwide, with the etiologic and healing processes being complex and multifactorial. Quantitative assessment of wound healing is challenging due to the subjective measurement of wound size and related characteristics. We propose that in vivo spectral reflectance measurements can serve as valuable clinical monitoring tool/device in the study of wound healing. We have designed a multi spectral camera able to acquire 18 wavelength sensitive images in a single snapshot. A lenslets array in front of a digital camera is combined with narrowband filters (bandwidth 10 nm) ranging from 460 to 886 nm. Images taken with the spectroscopic camera are composed of 18 identical sub-images, each carrying different spectral information, that can be used in the assessment of skin chromophores. A clinical trial based on a repeated measures design was conducted at the National Rehabilitation Hospital on 15 individuals to assess whether Poly Carboxy Methyl Glucose Sulfate (PCMGS, CACIPLIQ20), a bio-engineered component of the extracellular matrix of the skin, is effective at promoting healing of a variety of wounds. Multi spectral images collected at different wavelengths combined with optical skin models were used to quantify skin oxygen saturation and its relation to the traditional measures of wound healing.
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Affiliation(s)
- Ali Basiri
- The Catholic University of America, Washington, DC, USA
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35
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Abstract
A lack of noninvasive tools to quantify edema has limited our understanding of burn wound edema pathophysiology in a clinical setting. Near-infrared spectroscopy (NIR) is a new noninvasive tool able to measure water concentration/edema in tissue. The purpose of this study was to determine whether NIR could detect water concentration changes or edema formation in acute partial-thickness burn injuries. Adult burn patients within 72 hours postinjury, thermal etiology, partial-thickness burn depth, and <20% TBSA were included. Burn wounds were stratified into partial-thickness superficial or deep wounds based on histology and wound healing time. NIR devices were used to quantify edema in a burn and respective control sites. The sample population consisted of superficial (n = 12) and deep (n = 5) partial-thickness burn injuries. The patients did not differ with respect to age (40 +/- 15 years), TBSA (5 +/- 4%), and mean time for edema assessment (2 days). Water content increased 15% in burned tissue compared with the respective control regions. There were no differences in water content at the control sites. At 48 hours, deep partial-thickness injuries showed a 23% increase in water content compared with 18% superficial partial-thickness burns. NIR could detect differences in water content or edema formation in partial-thickness burns and unburned healthy regions. NIR holds promise as a noninvasive, portable clinical tool to quantify water content or edema in burn wounds.
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36
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Kollias N, Seo I, Bargo PR. Interpreting diffuse reflectance for in vivo skin reactions in terms of chromophores. JOURNAL OF BIOPHOTONICS 2010; 3:15-24. [PMID: 19946873 DOI: 10.1002/jbio.200900066] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/26/2023]
Abstract
The measurement and quantification of skin reactions to insults involves certain assumptions about the relation between intensity of color appearance of the skin and the concentration of endogenous chromophores. The underlying assumption is that the Beer-Lambert law is obeyed, i.e., that a linear relation exists between the absorbance and the concentration of each chromophore and that the total absorbance is the linear superposition of the contributions of each chromophore. In this paper the authors compiled the results from a number of interventions on human skin that result in changes in its appearance and small deviations from the homeostatic state, where the results may be accounted for by a single or multiple chromophores. The validity of the assumptions is found to hold for a limited range of responses. The biological constraints need to be considered in certain cases because as we move away from the homeostatic state, complex biological processes are induced.
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Affiliation(s)
- Nikiforos Kollias
- Models and Methods Department, Johnson and Johnson Consumer Products Companies, Skillman, NJ 08558-9418, USA.
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37
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Lin MZ, McKeown MR, Ng HL, Aguilera TA, Shaner NC, Campbell RE, Adams SR, Gross LA, Ma W, Alber T, Tsien RY. Autofluorescent proteins with excitation in the optical window for intravital imaging in mammals. CHEMISTRY & BIOLOGY 2009; 16:1169-79. [PMID: 19942140 PMCID: PMC2814181 DOI: 10.1016/j.chembiol.2009.10.009] [Citation(s) in RCA: 193] [Impact Index Per Article: 12.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/29/2009] [Revised: 10/05/2009] [Accepted: 10/12/2009] [Indexed: 01/16/2023]
Abstract
Fluorescent proteins have become valuable tools for biomedical research as protein tags, reporters of gene expression, biosensor components, and cell lineage tracers. However, applications of fluorescent proteins for deep tissue imaging in whole mammals have been constrained by the opacity of tissues to excitation light below 600 nm, because of absorbance by hemoglobin. Fluorescent proteins that excite efficiently in the "optical window" above 600 nm are therefore highly desirable. We report here the evolution of far-red fluorescent proteins with peak excitation at 600 nm or above. The brightest one of these, Neptune, performs well in imaging deep tissues in living mice. The crystal structure of Neptune reveals a novel mechanism for red-shifting involving the acquisition of a new hydrogen bond with the acylimine region of the chromophore.
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Affiliation(s)
- Michael Z. Lin
- Department of Pharmacology, University of California at San Diego, 9500 Gilman Drive, La Jolla, CA 92093, USA
| | - Michael R. McKeown
- Department of Pharmacology, University of California at San Diego, 9500 Gilman Drive, La Jolla, CA 92093, USA
| | - Ho-Leung Ng
- Department of Molecular and Cell Biology, University of California at Berkeley, 356 Stanley Hall, Berkeley, CA 94720, USA
| | - Todd A. Aguilera
- Department of Pharmacology, University of California at San Diego, 9500 Gilman Drive, La Jolla, CA 92093, USA
| | - Nathan C. Shaner
- Department of Pharmacology, University of California at San Diego, 9500 Gilman Drive, La Jolla, CA 92093, USA
| | - Robert E. Campbell
- Department of Pharmacology, University of California at San Diego, 9500 Gilman Drive, La Jolla, CA 92093, USA
| | - Stephen R. Adams
- Department of Pharmacology, University of California at San Diego, 9500 Gilman Drive, La Jolla, CA 92093, USA
| | - Larry A. Gross
- Department of Pharmacology, University of California at San Diego, 9500 Gilman Drive, La Jolla, CA 92093, USA
| | - Wendy Ma
- Department of Molecular and Cell Biology, University of California at Berkeley, 356 Stanley Hall, Berkeley, CA 94720, USA
| | - Tom Alber
- Department of Molecular and Cell Biology, University of California at Berkeley, 356 Stanley Hall, Berkeley, CA 94720, USA
| | - Roger Y. Tsien
- Department of Pharmacology, University of California at San Diego, 9500 Gilman Drive, La Jolla, CA 92093, USA
- Howard Hughes Medical Institute, University of California at San Diego, 9500 Gilman Drive, La Jolla, CA 92093, USA
- Department of Chemistry and Biochemistry, University of California at San Diego, 9500 Gilman Drive, La Jolla, CA 92093, USA
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38
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Zakian C, Pretty I, Ellwood R, Hamlin D. In vivo quantification of gingival inflammation using spectral imaging. JOURNAL OF BIOMEDICAL OPTICS 2008; 13:054045. [PMID: 19021425 DOI: 10.1117/1.2982536] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
Abstract
Erythema is a reaction of the skin and oral soft tissues commonly associated with inflammation and an increase in blood flow. Diffuse reflection spectroscopy is a powerful tool for the assessment of skin inflammation where erythema has been linked to the relative concentration of oxygenated hemoglobin and blood perfusion. Here we demonstrate the applicability of a spectral imaging method for the quantification of gingival inflammation by looking at the gingival margin and papillary tip erythema. We present a longitudinal study on 22 healthy volunteers divided in two groups. The first was allowed to have normal oral hygiene and the second was subjected to an induced gingivitis for two weeks by cessation of oral hygiene. The spectral reflectance ratio at 615 and 460 nm, R(615)R(460), was proposed as a method to quantify and map the erythema spatial distribution. These wavelengths represent spectral absorption crossovers observed between oxygenated and deoxygenated hemoglobin. The spectral method presented shows a significant separation (p<0.01) between the groups when gingivitis was induced and correlates significantly (p<0.05) with the clinical gingival index scores. We believe that these investigations could contribute to the development of functional imaging methods for periodontal disease detection and monitoring.
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Affiliation(s)
- Christian Zakian
- The University of Manchester, School of Dentistry, Dental Health Unit, Oxford Road, Manchester, M13 9PL, United Kingdom.
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39
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Binzoni T, Vogel A, Gandjbakhche AH, Marchesini R. Detection limits of multi-spectral optical imaging under the skin surface. Phys Med Biol 2008; 53:617-36. [PMID: 18199906 DOI: 10.1088/0031-9155/53/3/008] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Abstract
The present work shows that the optical/biological information contained in a typical spectral image mainly reflects the properties of a small (conic like) volume of tissue situated vertically under each individual pixel. The objects appearing on a spectral image reasonably reproduce the correct geometrical shape and size (like a non-deformed shadow) of underlying inclusions of pathological tissue. The information contained in a spectral image comes from a depth that does not exceed approximately 2-3 mm. The number of photons that visit a given tissue voxel situated at a depth larger than approximately 2 mm represents less than the 1% of the total number of photons reaching the corresponding detection pixel (forming the image). A pathological inclusion (e.g. a pool of blood or vascular tumor) situated at a depth of approximately 0.5 mm with a thickness of 0.5 mm produces an image intensity contrast of approximately 5% (for images taken at wavelengths in the 600-1000 nm range) when compared to the normal skin background. The same inclusion at a depth of 20 microm provides a contrast decreasing from 55 to 20% with respect to an increase in wavelength. The dermis/hypodermis interface behaves as a partial barrier for the photons, limiting their access to deeper skin regions. The image contrast depends on the depth and the type of chromophore contained in the inclusion. An increase in the concentration of a given molecule may produce different contrast, independently of the depth, depending on the characteristics of the skin layer where this change occurs.
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Affiliation(s)
- T Binzoni
- Département des Neurosciences Fondamentales, University of Geneva, Switzerland.
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40
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Hama Y, Koyama Y, Urano Y, Choyke PL, Kobayashi H. Two-Color Lymphatic Mapping Using Ig-Conjugated Near Infrared Optical Probes. J Invest Dermatol 2007; 127:2351-6. [PMID: 17522707 DOI: 10.1038/sj.jid.5700892] [Citation(s) in RCA: 44] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
To map the drainage patterns of the lymphatic system, multicolor optical probes must be developed, which can be interstitially administered. These agents must be of sufficient size to be retained by the lymphatic system and permit the conjugation or incorporation of fluorescent probes with varying emission wavelengths. Quantum dots fulfill these criteria, but their potential toxicity limits their application to research settings. Here, we describe the synthesis of lymphatic optical probes based on Igs conjugated with Cy5.5 and Cy7 and demonstrate in animal models that these agents can map the lymphatic drainage patterns within axillary nodes draining both the breast and upper extremity, cervical nodes draining both the ear and upper extremity, and sentinel lymph nodes draining different anatomic locations. The ability to separately and simultaneously visualize the drainage patterns from two separate lymphatic vessels may have implications for the preoperative mapping of lymph nodes before lymph node resection. The biocompatibility of fluorescently labeled Igs in comparison to other nanoparticulate fluorophores improves the chances of clinical translation. This noninvasive and biocompatible multicolor method of optical lymphangiography may elucidate the complex human lymphatic system and reduce the risk of lymphedema after surgery for melanoma and other cancers.
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Affiliation(s)
- Yukihiro Hama
- Molecular Imaging Program, Center for Cancer Research, National Cancer Institute, NIH, Bethesda, Maryland 20892-1088, USA
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41
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Stamatas GN, Kollias N. In vivo documentation of cutaneous inflammation using spectral imaging. JOURNAL OF BIOMEDICAL OPTICS 2007; 12:051603. [PMID: 17994872 DOI: 10.1117/1.2798704] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/08/2023]
Abstract
Typical manifestations of cutaneous inflammation include erythema and edema. While erythema is the result of capillary dilation and local increase of oxygenated hemoglobin concentration, edema is characterized by an increase in extracellular fluid in the dermis, leading to local tissue swelling. Both of these inflammatory reactions are typically graded visually. We demonstrate the potential of spectral imaging as an objective noninvasive method for quantitative documentation of both erythema and edema. As examples of dermatological conditions that exhibit skin inflammation we applied this method on patients suffering from (1) allergic dermatitis (poison ivy rashes), (2) inflammatory acne, and (3) viral infection (herpes zoster). Spectral images are acquired in the visible and near-IR part of the spectrum. Based on a spectral decomposition algorithm, apparent concentrations maps are constructed for oxyhemoglobin, deoxyhemoglobin, melanin, optical scattering, and water. In each dermatological condition examined, the concentration maps of oxyhemoglobin and water represent quantitative visualizations of the intensity and extent of erythema and cutaneous edema, correspondingly. We demonstrate that spectral imaging can be used to quantitatively document parameters relevant to skin inflammation. Applications may include monitoring of disease progression as well as screening for efficacy of treatments.
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Affiliation(s)
- Georgios N Stamatas
- Johnson & Johnson Consumer Products Company, Division of Johnson & Johnson Consumer Companies, Inc., Methods and Models Development, Skillman, New Jersey 08558, USA.
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42
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