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Jambor AN, Shelton EM, Kijowski R, Henak CR, Campagnola PJ. Assessing collagen alterations in enzymatic degradation models of osteoarthritis via second harmonic generation microscopy. Osteoarthritis Cartilage 2021; 29:1590-1599. [PMID: 34454101 PMCID: PMC8542598 DOI: 10.1016/j.joca.2021.08.004] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/11/2020] [Revised: 07/30/2021] [Accepted: 08/16/2021] [Indexed: 02/02/2023]
Abstract
INTRODUCTION Structural changes in the collagen II architecture of osteoarthritis (OA) are poorly understood, which is a large shortcoming in the early diagnosis of this disease. Though degradation can be simulated by enzymes including trypsin and bacterial collagenase, the specific structural features of each digestion and their relationship to naturally occurring OA remain unclear. EXPERIMENTAL DESIGN We used collagen sensitive/specific Second Harmonic Generation (SHG) microscopy in conjunction with optical scattering measurements to probe the resulting architecture changes in bovine knee cartilage upon trypsin and collagenase degradation. Image features extracted from SHG images were used to train a linear discriminant (LD) model capable of classifying enzymatic degradation, which was then applied to human cartilage with varied modified Mankin histological scores. RESULTS The treatment of cartilage with these enzymes resulted in more disorganized collagen structure, where this effect was greatest with collagenase treatment. Using the LD model, we classified the control and degraded tissues in the three zones with >92% accuracy, showing that these enzymes have distinct activity on the collagen assembly. Application of the LD model to human cartilage indicated that collagenase effects were more representative of in vivo degeneration and were also consistent with damage beginning at the articular surface and progressing into deeper zones. CONCLUSIONS SHG and optical scattering measurements successfully delineate trypsin and collagenase degradation and suggest that collagen alterations in human OA are better simulated by the latter mechanism. These results lay the groundwork for using high-resolution SHG and optical scattering as an earlier diagnostic tool than is currently available.
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Affiliation(s)
- Alexander N. Jambor
- Department of Biomedical Engineering, University of Wisconsin-Madison, 1550 Engineering Dr, Madison, WI 53706, USA
| | - Emily M. Shelton
- Department of Biomedical Engineering, University of Wisconsin-Madison, 1550 Engineering Dr, Madison, WI 53706, USA,Department of Physics, University of Wisconsin-Madison, 1150 University Ave, Madison, WI 53706, USA
| | - Richard Kijowski
- Department of Radiology, 600 Highland Ave, University of Wisconsin-Madison, Madison, WI 53705, USA
| | - Corinne R. Henak
- Department of Biomedical Engineering, University of Wisconsin-Madison, 1550 Engineering Dr, Madison, WI 53706, USA,Department of Mechanical Engineering, University of Wisconsin-Madison, 1513 University Ave, Madison, WI 53706, USA,,
| | - Paul J. Campagnola
- Department of Biomedical Engineering, University of Wisconsin-Madison, 1550 Engineering Dr, Madison, WI 53706, USA,,
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James DS, Brereton CJ, Davies DE, Jones MG, Campagnola PJ. Examining lysyl oxidase-like modulation of collagen architecture in 3D spheroid models of idiopathic pulmonary fibrosis via second-harmonic generation microscopy. JOURNAL OF BIOMEDICAL OPTICS 2021; 26:JBO-210062R. [PMID: 34145800 PMCID: PMC8212879 DOI: 10.1117/1.jbo.26.6.066501] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 03/01/2021] [Accepted: 05/27/2021] [Indexed: 06/12/2023]
Abstract
SIGNIFICANCE Idiopathic pulmonary fibrosis (IPF) patients have a poor prognosis with short lifespan following diagnosis as there are limited effective treatment options. Despite matrix stiffening being the hallmark of the disease there remains a lack of knowledge surrounding the underlying collagen alterations in the disease. Specifically, while increased collagen crosslinking has been implicated, the resulting effects on collagen macro/supramolecular changes have not been explored. AIM We sought to determine if second-harmonic generation (SHG) microscopy could characterize differences in the collagen architecture in 3D spheroid models of IPF grown under different crosslinking modulation conditions (promotion and inhibition). APPROACH We used SHG metrics based on the fiber morphology, relative SHG brightness, and macro/supramolecular structure by SHG polarization analyses to compare the structure of the IPF spheroids. RESULTS Comparison of the fiber morphology of the spheroids showed that the control group had the longest, straightest, and thickest fibers. The spheroids with crosslink enhancement and inhibition had the highest and lowest SHG conversion efficiencies, respectively, consistent with the resulting harmonophore density. SHG polarization analyses showed that the peptide pitch angle, alignment of collagen molecules, and overall chirality were altered upon crosslink modulation and were also consistent with reduced organization relative to the control group. CONCLUSIONS While no single SHG signature is associated with crosslinking, we show that the suite of metrics used here is effective in delineating alterations across the collagen architecture sizescales. The results largely mirror those of human tissues and demonstrate that the combination of 3D spheroid models and SHG analysis is a powerful approach for hypothesis testing the roles of operative cellular and molecular factors in IPF.
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Affiliation(s)
- Darian S. James
- University of Wisconsin–Madison, Department of Biomedical Engineering, Madison, Wisconsin, United States
| | - Christopher J. Brereton
- University of Southampton, Clinical and Experimental Sciences, Faculty of Medicine, Southampton, United Kingdom
- University Hospital Southampton, National Institute for Health Research Southampton Biomedical Research Centre, Southampton, United Kingdom
- University of Southampton, Institute for Life Sciences, Southampton, United Kingdom
| | - Donna E. Davies
- University of Southampton, Clinical and Experimental Sciences, Faculty of Medicine, Southampton, United Kingdom
- University Hospital Southampton, National Institute for Health Research Southampton Biomedical Research Centre, Southampton, United Kingdom
- University of Southampton, Institute for Life Sciences, Southampton, United Kingdom
| | - Mark G. Jones
- University of Southampton, Clinical and Experimental Sciences, Faculty of Medicine, Southampton, United Kingdom
- University Hospital Southampton, National Institute for Health Research Southampton Biomedical Research Centre, Southampton, United Kingdom
- University of Southampton, Institute for Life Sciences, Southampton, United Kingdom
| | - Paul J. Campagnola
- University of Wisconsin–Madison, Department of Biomedical Engineering, Madison, Wisconsin, United States
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Chen CH, Nair AV, Chuang SC, Lin YS, Cheng MH, Lin CY, Chang CY, Chen SJ, Lien CH. Dual-LC PSHG microscopy for imaging collagen type I and type II gels with pixel-resolution analysis. BIOMEDICAL OPTICS EXPRESS 2021; 12:3050-3065. [PMID: 34168914 PMCID: PMC8194623 DOI: 10.1364/boe.416193] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/30/2020] [Revised: 03/18/2021] [Accepted: 04/07/2021] [Indexed: 05/27/2023]
Abstract
Collagen of type I (Col I) and type II (Col II) are critical for cartilage and connective tissues in the human body, and several diseases may alter their properties. Assessing the identification and quantification of fibrillar collagen without biomarkers is a challenge. Advancements in non-invasive polarization-resolved second-harmonic generation (PSHG) microscopy have provided a method for the non-destructive investigation of collagen molecular level properties. Here we explored an alternative polarization modulated approach, dual-LC PSHG, that is based on two liquid crystal devices (Liquid crystal polarization rotators, LPRs) operating simultaneously with a laser scanning SHG microscope. We demonstrated that this more accessible technology allows the quick and accurate generation of any desired linear and circular polarization state without any mechanical parts. This study demonstrates that this method can aid in improving the ability to quantify the characteristics of both types of collagen, including pitch angle, anisotropy, and circular dichroism analysis. Using this approach, we estimated the effective pitch angle for Col I and Col II to be 49.7° and 51.6°, respectively. The effective peptide pitch angle for Col II gel was first estimated and is similar to the value obtained for Col I gel in the previous studies. Additionally, the difference of the anisotropy parameter of both collagen type gels was assessed to be 0.293, which reflects the different type molecular fibril assembly. Further, our work suggests a potential method for monitoring and differentiating different collagen types in biological tissues, especially cartilage or connective tissue.
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Affiliation(s)
- Chung-Hwan Chen
- Orthopaedic Research Centre, Kaohsiung Medical University, Kaohsiung, Taiwan
- Regeneration Medicine and Cell Therapy Research Center, Kaohsiung Medical University, Kaohsiung, Taiwan
- Departments of Orthopedics, College of Medicine, Kaohsiung Medical University, Kaohsiung, Taiwan
- Division of Adult Reconstruction Surgery, Department of Orthopedics, Kaohsiung Medical University Hospital, Kaohsiung Medical University, Kaohsiung, Taiwan
- Department of Orthopedics, Kaohsiung Municipal Ta-Tung Hospital, Kaohsiung Medical University, Kaohsiung, Taiwan
| | | | - Shu-Chun Chuang
- Orthopaedic Research Centre, Kaohsiung Medical University, Kaohsiung, Taiwan
- Regeneration Medicine and Cell Therapy Research Center, Kaohsiung Medical University, Kaohsiung, Taiwan
| | - Yi-Shan Lin
- Orthopaedic Research Centre, Kaohsiung Medical University, Kaohsiung, Taiwan
- Regeneration Medicine and Cell Therapy Research Center, Kaohsiung Medical University, Kaohsiung, Taiwan
| | - Mei-Hsin Cheng
- Orthopaedic Research Centre, Kaohsiung Medical University, Kaohsiung, Taiwan
- Regeneration Medicine and Cell Therapy Research Center, Kaohsiung Medical University, Kaohsiung, Taiwan
| | - Chun-Yu Lin
- College of Photonics, National Chiao Tung University, Tainan, Taiwan
| | - Chia-Ying Chang
- College of Photonics, National Chiao Tung University, Tainan, Taiwan
| | - Shean-Jen Chen
- College of Photonics, National Chiao Tung University, Tainan, Taiwan
| | - Chi-Hsiang Lien
- Department of Mechanical Engineering, National United University, Miaoli, Taiwan
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James DS, Campagnola PJ. Recent Advancements in Optical Harmonic Generation Microscopy: Applications and Perspectives. BME FRONTIERS 2021; 2021:3973857. [PMID: 37849910 PMCID: PMC10521653 DOI: 10.34133/2021/3973857] [Citation(s) in RCA: 15] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/27/2020] [Accepted: 12/14/2020] [Indexed: 10/19/2023] Open
Abstract
Second harmonic generation (SHG) and third harmonic generation (THG) microscopies have emerged as powerful imaging modalities to examine structural properties of a wide range of biological tissues. Although SHG and THG arise from very different contrast mechanisms, the two are complimentary and can often be collected simultaneously using a modified multiphoton microscope. In this review, we discuss the needed instrumentation for these modalities as well as the underlying theoretical principles of SHG and THG in tissue and describe how these can be leveraged to extract unique structural information. We provide an overview of recent advances showing how SHG microscopy has been used to evaluate collagen alterations in the extracellular matrix and how this has been used to advance our knowledge of cancers, fibroses, and the cornea, as well as in tissue engineering applications. Specific examples using polarization-resolved approaches and machine learning algorithms are highlighted. Similarly, we review how THG has enabled developmental biology and skin cancer studies due to its sensitivity to changes in refractive index, which are ubiquitous in all cell and tissue assemblies. Lastly, we offer perspectives and outlooks on future directions of SHG and THG microscopies and present unresolved questions, especially in terms of overall miniaturization and the development of microendoscopy instrumentation.
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Affiliation(s)
- Darian S. James
- Department of Biomedical Engineering, University of Wisconsin-Madison, 1550 Engineering Dr, Madison, WI 53706, USA
| | - Paul J. Campagnola
- Department of Biomedical Engineering, University of Wisconsin-Madison, 1550 Engineering Dr, Madison, WI 53706, USA
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Pendleton EG, Tehrani KF, Barrow RP, Mortensen LJ. Second harmonic generation characterization of collagen in whole bone. BIOMEDICAL OPTICS EXPRESS 2020; 11:4379-4396. [PMID: 32923050 PMCID: PMC7449751 DOI: 10.1364/boe.391866] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/02/2020] [Revised: 06/10/2020] [Accepted: 06/16/2020] [Indexed: 05/24/2023]
Abstract
Bone is a unique biological composite material made up of a highly structured collagen mesh matrix and mineral deposits. Although mineral provides stiffness, collagen's secondary organization provides a critical role in bone elasticity. Here, we performed polarimetric analysis of bone collagen fibers using second harmonic generation (SHG) imaging to evaluate lamella sheets and collagen fiber integrity in intact cranial bone. Our polarimetric data was fitted to a model accounting for diattenuation, polarization cross-talk, and birefringence. We compared our data to the fitted model and found no significant difference between our polarimetric observation and the representation of these scattering properties up to 70 µm deep. We also observed a loss of resolution as we imaged up to 70 µm deep into bone but a conservation of polarimetric response. Polarimetric SHG allows for the discrimination of collagen lamellar sheet structures in intact bone. Our work could allow for label-free identification of disease states and monitor the efficacy of therapies for bone disorders.
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Affiliation(s)
- Emily G. Pendleton
- Regenerative Bioscience Center, Rhodes Center for ADS, University of Georgia, Athens, GA 30602, USA
| | - Kayvan F. Tehrani
- Regenerative Bioscience Center, Rhodes Center for ADS, University of Georgia, Athens, GA 30602, USA
| | - Ruth P. Barrow
- Regenerative Bioscience Center, Rhodes Center for ADS, University of Georgia, Athens, GA 30602, USA
| | - Luke J. Mortensen
- Regenerative Bioscience Center, Rhodes Center for ADS, University of Georgia, Athens, GA 30602, USA
- School of Chemical, Materials and Biomedical Engineering, University of Georgia, Athens, GA 30602, USA
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Golaraei A, Kontenis L, Karunendiran A, Stewart BA, Barzda V. Dual- and single-shot susceptibility ratio measurements with circular polarizations in second-harmonic generation microscopy. JOURNAL OF BIOPHOTONICS 2020; 13:e201960167. [PMID: 31975533 DOI: 10.1002/jbio.201960167] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/26/2019] [Revised: 12/18/2019] [Accepted: 01/15/2020] [Indexed: 06/10/2023]
Abstract
Polarization-resolved second-harmonic generation (P-SHG) microscopy is a technique capable of characterizing nonlinear optical properties of noncentrosymmetric biomaterials by extracting the nonlinear susceptibility tensor components ratio χzzz2'/χzxx2' , with z-axis parallel and x-axis perpendicular to the C6 symmetry axis of molecular fiber, such as a myofibril or a collagen fiber. In this paper, we present two P-SHG techniques based on incoming and outgoing circular polarization states for a fast extraction of χzzz2'/χzxx2' : A dual-shot configuration where the SHG circular anisotropy generated using incident right- and left-handed circularly-polarized light is measured; and a single-shot configuration for which the SHG circular anisotropy is measured using only one incident circular polarization state. These techniques are used to extract the χzzz2'/χzxx2' of myosin fibrils in the body wall muscles of Drosophila melanogaster larva. The results are in good agreement with values obtained from the double Stokes-Mueller polarimetry. The dual- and single-shot circular anisotropy measurements can be used for fast imaging that is independent of the in-plane orientation of the sample. They can be used for imaging of contracting muscles, or for high throughput imaging of large sample areas.
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Affiliation(s)
- Ahmad Golaraei
- Princess Margaret Cancer Centre, University Health Network, Toronto, Ontario, Canada
- Department of Physics, University of Toronto, Toronto, Ontario, Canada
- Department of Chemical and Physical Sciences, University of Toronto Mississauga, Mississauga, Ontario, Canada
| | - Lukas Kontenis
- Light Conversion, Vilnius, Lithuania
- Faculty of Physics, Laser Research Centre, Vilnius University, Vilnius, Lithuania
| | - Abiramy Karunendiran
- Department of Biology, University of Toronto Mississauga, Mississauga, Ontario, Canada
- Department of Cell and Systems Biology, University of Toronto, Toronto, Ontario, Canada
| | - Bryan A Stewart
- Department of Biology, University of Toronto Mississauga, Mississauga, Ontario, Canada
- Department of Cell and Systems Biology, University of Toronto, Toronto, Ontario, Canada
| | - Virginijus Barzda
- Department of Physics, University of Toronto, Toronto, Ontario, Canada
- Department of Chemical and Physical Sciences, University of Toronto Mississauga, Mississauga, Ontario, Canada
- Faculty of Physics, Laser Research Centre, Vilnius University, Vilnius, Lithuania
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7
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Rentchler EC, Gant KL, Drapkin R, Patankar M, J. Campagnola P. Imaging Collagen Alterations in STICs and High Grade Ovarian Cancers in the Fallopian Tubes by Second Harmonic Generation Microscopy. Cancers (Basel) 2019; 11:cancers11111805. [PMID: 31744173 PMCID: PMC6896112 DOI: 10.3390/cancers11111805] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/01/2019] [Accepted: 11/14/2019] [Indexed: 11/17/2022] Open
Abstract
The majority of high-grade serous ovarian cancers originate in the fallopian tubes, however, the corresponding structural changes in the extracellular matrix (ECM) have not been well-characterized. This information could provide new insight into the carcinogenesis and provide the basis for new diagnostic tools. We have previously used the collagen-specific Second Harmonic Generation (SHG) microscopy to probe collagen fiber alterations in high-grade serous ovarian cancer and in other ovarian tumors, and showed they could be uniquely identified by machine learning approaches. Here we couple SHG imaging of serous tubal intra-epithelial carcinomas (STICs), high-grade cancers, and normal regions of the fallopian tubes, using three distinct image analysis approaches to form a classification scheme based on the respective collagen fiber morphology. Using a linear discriminant analysis, we achieved near 100% classification accuracy between high-grade disease and the other tissues, where the STICs and normal regions were differentiated with ~75% accuracy. Importantly, the collagen in high-grade disease in both the fallopian tube and the ovary itself have a similar collagen morphology, further substantiating the metastasis between these sites. This analysis provides a new method of classification, but also quantifies the structural changes in the disease, which may provide new insight into metastasis.
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Affiliation(s)
- Eric C. Rentchler
- Department of Biomedical Engineering, University of Wisconsin, Madison, WI 53706, USA;
| | - Kristal L. Gant
- Department of Obstetrics and Gynecology, University of Wisconsin, Madison, WI 53706, USA; (K.L.G.); (M.P.)
| | - Ronny Drapkin
- Department of Obstetrics and Gynecology, University of Pennsylvania, Philadelphia, PA 19104, USA;
| | - Manish Patankar
- Department of Obstetrics and Gynecology, University of Wisconsin, Madison, WI 53706, USA; (K.L.G.); (M.P.)
| | - Paul J. Campagnola
- Department of Biomedical Engineering, University of Wisconsin, Madison, WI 53706, USA;
- Correspondence:
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8
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James DS, Jambor AN, Chang HY, Alden Z, Tilbury KB, Sandbo NK, Campagnola PJ. Probing ECM remodeling in idiopathic pulmonary fibrosis via second harmonic generation microscopy analysis of macro/supramolecular collagen structure. JOURNAL OF BIOMEDICAL OPTICS 2019; 25:1-13. [PMID: 31785093 PMCID: PMC7008503 DOI: 10.1117/1.jbo.25.1.014505] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/12/2019] [Accepted: 11/06/2019] [Indexed: 05/06/2023]
Abstract
Idiopathic pulmonary fibrosis (IPF) is a progressive disease with poor prognosis with short lifespan following diagnosis as patients have limited effective treatment options. A fundamental limitation is a lack of knowledge of the underlying collagen alterations in the disease, as this could lead to better diagnostics, prognostics, and measures of treatment efficacy. While the fibroses is the primary presentation of the disease, the collagen architecture has not been well studied beyond standard histology. Here, we used several metrics based on second harmonic generation (SHG) microscopy and optical scattering measurements to characterize the subresolution collagen assembly in human IPF and normal lung tissues. Using SHG directional analysis, we found that while collagen synthesis is increased in IPF, the resulting average fibril architecture is more disordered than in normal tissue. Wavelength-dependent optical scattering measurements lead to the same conclusion, and both optical approaches are consistent with ultrastructural analysis. SHG circular dichroism revealed significant differences in the net chirality between the fibrotic and normal collagen, where the former has a more randomized helical structure. Collectively, the measurements reveal significant changes in the collagen macro/supramolecular structure in the abnormal fibrotic collagen, and we suggest these alterations can serve as biomarkers for IPF diagnosis and progression.
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Affiliation(s)
- Darian S. James
- University of Wisconsin–Madison, Department of Biomedical Engineering, Madison, Wisconsin, United States
| | - Alexander N. Jambor
- University of Wisconsin–Madison, Department of Biomedical Engineering, Madison, Wisconsin, United States
| | - Hsin-Yu Chang
- University of Wisconsin–Madison, Department of Biomedical Engineering, Madison, Wisconsin, United States
| | - Zachary Alden
- University of Wisconsin–Madison, Department of Biomedical Engineering, Madison, Wisconsin, United States
| | - Karissa B. Tilbury
- University of Wisconsin–Madison, Department of Biomedical Engineering, Madison, Wisconsin, United States
| | - Nathan K. Sandbo
- University of Wisconsin–Madison, Division of Allergy, Pulmonary, and Critical Care Medicine, Madison, Wisconsin, United States
| | - Paul J. Campagnola
- University of Wisconsin–Madison, Department of Biomedical Engineering, Madison, Wisconsin, United States
- Address all correspondence to Paul J. Campagnola, E-mail:
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Ducourthial G, Affagard JS, Schmeltz M, Solinas X, Lopez-Poncelas M, Bonod-Bidaud C, Rubio-Amador R, Ruggiero F, Allain JM, Beaurepaire E, Schanne-Klein MC. Monitoring dynamic collagen reorganization during skin stretching with fast polarization-resolved second harmonic generation imaging. JOURNAL OF BIOPHOTONICS 2019; 12:e201800336. [PMID: 30604478 DOI: 10.1002/jbio.201800336] [Citation(s) in RCA: 21] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/03/2018] [Revised: 12/04/2018] [Accepted: 01/02/2019] [Indexed: 06/09/2023]
Abstract
The mechanical properties of biological tissues are strongly correlated to the specific distribution of their collagen fibers. Monitoring the dynamic reorganization of the collagen network during mechanical stretching is however a technical challenge, because it requires mapping orientation of collagen fibers in a thick and deforming sample. In this work, a fast polarization-resolved second harmonic generation microscope is implemented to map collagen orientation during mechanical assays. This system is based on line-to-line switching of polarization using an electro-optical modulator and works in epi-detection geometry. After proper calibration, it successfully highlights the collagen dynamic alignment along the traction direction in ex vivo murine skin dermis. This microstructure reorganization is quantified by the entropy of the collagen orientation distribution as a function of the stretch ratio. It exhibits a linear behavior, whose slope is measured with a good accuracy. This approach can be generalized to probe a variety of dynamic processes in thick tissues.
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Affiliation(s)
| | | | | | - Xavier Solinas
- LOB, École Polytechnique, CNRS, INSERM, Palaiseau, France
| | | | - Christelle Bonod-Bidaud
- Institut de Génomique Fonctionnelle de Lyon, ENS-Lyon, CNRS, Université de Lyon, Lyon, France
| | - Ruth Rubio-Amador
- Institut de Génomique Fonctionnelle de Lyon, ENS-Lyon, CNRS, Université de Lyon, Lyon, France
| | - Florence Ruggiero
- Institut de Génomique Fonctionnelle de Lyon, ENS-Lyon, CNRS, Université de Lyon, Lyon, France
| | - Jean-Marc Allain
- LMS, École Polytechnique, CNRS, Palaiseau, France
- Inria, Université Paris-Saclay, Palaiseau, France
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Pijanka JK, Markov PP, Midgett D, Paterson NG, White N, Blain EJ, Nguyen TD, Quigley HA, Boote C. Quantification of collagen fiber structure using second harmonic generation imaging and two-dimensional discrete Fourier transform analysis: Application to the human optic nerve head. JOURNAL OF BIOPHOTONICS 2019; 12:e201800376. [PMID: 30578592 PMCID: PMC6506269 DOI: 10.1002/jbio.201800376] [Citation(s) in RCA: 20] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/02/2018] [Revised: 12/13/2018] [Accepted: 12/19/2018] [Indexed: 05/17/2023]
Abstract
Second harmonic generation (SHG) microscopy is widely used to image collagen fiber microarchitecture due to its high spatial resolution, optical sectioning capabilities and relatively nondestructive sample preparation. Quantification of SHG images requires sensitive methods to capture fiber alignment. This article presents a two-dimensional discrete Fourier transform (DFT)-based method for collagen fiber structure analysis from SHG images. The method includes integrated periodicity plus smooth image decomposition for correction of DFT edge discontinuity artefact, avoiding the loss of peripheral image data encountered with more commonly used windowing methods. Outputted parameters are as follows: the collagen fiber orientation distribution, aligned collagen content and the degree of collagen fiber dispersion along the principal orientation. We demonstrate its application to determine collagen microstructure in the human optic nerve head, showing its capability to accurately capture characteristic structural features including radial fiber alignment in the innermost layers of the bounding sclera and a circumferential collagen ring in the mid-stromal tissue. Higher spatial resolution rendering of individual lamina cribrosa beams within the nerve head is also demonstrated. Validation of the method is provided in the form of correlative results from wide-angle X-ray scattering and application of the presented method to other fibrous tissues.
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Affiliation(s)
- Jacek K. Pijanka
- Structural Biophysics Group, School of Optometry and
Vision Sciences, Cardiff University, CF24 4HQ, Cardiff, UK
| | - Petar P. Markov
- Structural Biophysics Group, School of Optometry and
Vision Sciences, Cardiff University, CF24 4HQ, Cardiff, UK
| | - Dan Midgett
- Department of Mechanical Engineering, The Johns Hopkins
University, Baltimore, MD 21218, USA
- Department of Materials Science, The Johns Hopkins
University, Baltimore, MD 21218, USA
| | - Neil G. Paterson
- Diamond Light Source, Harwell Science and Innovation
Campus, Harwell, UK
| | - Nick White
- Vivat Scientia Bioimaging Labs, School of Optometry and
Visual Sciences, Cardiff University, CF24 4HQ, Cardiff, UK
| | - Emma J. Blain
- Arthritis Research UK Biomechanics and Bioengineering
Centre, Cardiff University, CF10 3AX, Cardiff, UK
| | - Thao D. Nguyen
- Department of Mechanical Engineering, The Johns Hopkins
University, Baltimore, MD 21218, USA
- Department of Materials Science, The Johns Hopkins
University, Baltimore, MD 21218, USA
| | - Harry A. Quigley
- Wilmer Ophthalmological Institute, School of Medicine, The
Johns Hopkins University, Baltimore, MD 21287, USA
| | - Craig Boote
- Structural Biophysics Group, School of Optometry and
Vision Sciences, Cardiff University, CF24 4HQ, Cardiff, UK
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11
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Tokarz D, Cisek R, Joseph A, Golaraei A, Mirsanaye K, Krouglov S, Asa SL, Wilson BC, Barzda V. Characterization of Pancreatic Cancer Tissue Using Multiphoton Excitation Fluorescence and Polarization-Sensitive Harmonic Generation Microscopy. Front Oncol 2019; 9:272. [PMID: 31058080 PMCID: PMC6478795 DOI: 10.3389/fonc.2019.00272] [Citation(s) in RCA: 21] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/26/2018] [Accepted: 03/25/2019] [Indexed: 12/31/2022] Open
Abstract
Thin tissue sections of normal and tumorous pancreatic tissues stained with hematoxylin and eosin were investigated using multiphoton excitation fluorescence (MPF), second harmonic generation (SHG), and third harmonic generation (THG) microscopies. The cytoplasm, connective tissue, collagen and extracellular structures are visualized with MPF due to the eosin stain, whereas collagen is imaged with endogenous SHG contrast that does not require staining. Cellular structures, including membranous interfaces and nuclear components, are seen with THG due to the aggregation of hematoxylin dye. Changes in the collagen ultrastructure in pancreatic cancer were investigated by a polarization-sensitive SHG microscopy technique, polarization-in, polarization-out (PIPO) SHG. This involves measuring the orientation of the linear polarization of the SHG signal as a function of the linear polarization orientation of the incident laser radiation. From the PIPO SHG data, the second-order non-linear optical susceptibility ratio, χ(2) zzz '/χ(2) zxx ', was obtained that serves as a structural parameter for characterizing the tissue. Furthermore, by assuming C6 symmetry, an additional second-order non-linear optical susceptibility ratio, χ(2) xyz '/χ(2) zxx ', was obtained, which is a measure of the chirality of the collagen fibers. Statistically-significant differences in the χ(2) zzz '/χ(2) zxx ' values were found between tumor and normal pancreatic tissues in periductal, lobular, and parenchymal regions, whereas statistically-significant differences in the full width at half maximum (FWHM) of χ(2) xyz '/χ(2) zxx ' occurrence histograms were found between tumor and normal pancreatic tissues in periductal and parenchymal regions. Additionally, the PIPO SHG data were used to determine the degree of linear polarization (DOLP) of the SHG signal, which indicates the relative linear depolarization of the signal. Statistically-significant differences in DOLP values were found between tumor and normal pancreatic tissues in periductal and parenchymal regions. Hence, the differences observed in the χ(2) zzz '/χ(2) zxx ' values, the FWHM of χ(2) xyz '/χ(2) zxx ' values and the DOLP values could potentially be used to aid pathologists in diagnosing pancreatic cancer.
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Affiliation(s)
- Danielle Tokarz
- Department of Chemistry, Saint Mary's University, Halifax, NS, Canada
| | - Richard Cisek
- Department of Chemistry, Saint Mary's University, Halifax, NS, Canada
| | - Ariana Joseph
- Department of Chemistry, Saint Mary's University, Halifax, NS, Canada
| | - Ahmad Golaraei
- Department of Physics, University of Toronto, Toronto, ON, Canada
- Department of Chemical and Physical Sciences, University of Toronto Mississauga, Mississauga, ON, Canada
- Princess Margaret Cancer Centre, University of Toronto, Toronto, ON, Canada
| | - Kamdin Mirsanaye
- Department of Physics, University of Toronto, Toronto, ON, Canada
- Department of Chemical and Physical Sciences, University of Toronto Mississauga, Mississauga, ON, Canada
| | - Serguei Krouglov
- Department of Physics, University of Toronto, Toronto, ON, Canada
- Department of Chemical and Physical Sciences, University of Toronto Mississauga, Mississauga, ON, Canada
| | - Sylvia L. Asa
- University Health Network, University of Toronto, Toronto, ON, Canada
| | - Brian C. Wilson
- Princess Margaret Cancer Centre, University of Toronto, Toronto, ON, Canada
- Department of Medical Biophysics, University of Toronto, Toronto, ON, Canada
| | - Virginijus Barzda
- Department of Physics, University of Toronto, Toronto, ON, Canada
- Department of Chemical and Physical Sciences, University of Toronto Mississauga, Mississauga, ON, Canada
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12
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Włodarczyk P, Pustelny S, Budker D. System for control of polarization state of light and generation of light with continuously rotating linear polarization. THE REVIEW OF SCIENTIFIC INSTRUMENTS 2019; 90:013110. [PMID: 30709200 DOI: 10.1063/1.5066071] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/12/2018] [Accepted: 01/06/2019] [Indexed: 06/09/2023]
Abstract
We present a technique for generating light in an arbitrary polarization state. The technique is based on interference of two orthogonally polarized light beams, whose amplitudes and phases are controlled with a Mach-Zehnder inteferometer with acousto-optic modulators (AOMs) placed in each arm. We demonstrate that via control over amplitudes, phases, and frequencies of acoustic waves driving the AOMs, any polarization state can be synthesized. In particular, we demonstrate generation of linearly polarized light, whose polarization plane continuously rotates at a rate from 1 kHz to 1 MHz. Such light finds applications in science (e.g., investigations of Bloch-Siegert effect) and technology (optically pumped magnetometers).
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Affiliation(s)
- P Włodarczyk
- Faculty of Computer Science, Electronics and Telecommunications, AGH University of Science and Technology, Mickiewicza 30, 30-059 Kraków, Poland
| | - S Pustelny
- Institute of Physics, Jagiellonian University, Łojasiewicza 11, 30-348 Kraków, Poland
| | - D Budker
- Helmholtz Institute Mainz, Johannes Gutenberg University, 55099 Mainz, Germany
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13
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Campbell KR, Chaudhary R, Handel JM, Patankar MS, Campagnola PJ. Polarization-resolved second harmonic generation imaging of human ovarian cancer. JOURNAL OF BIOMEDICAL OPTICS 2018; 23:1-8. [PMID: 29900704 PMCID: PMC5998835 DOI: 10.1117/1.jbo.23.6.066501] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/09/2018] [Accepted: 05/23/2018] [Indexed: 05/05/2023]
Abstract
Remodeling of the extracellular matrix in human ovarian cancer can be manifested in increased collagen concentration, changes in alignment within fibrils/fibers and/or up-regulation of different collagen isoforms. We used pixel-based second harmonic generation (SHG) polarization microscopy analyses to probe these molecular changes in human ovarian tissues [normal stroma, benign tumors, and high-grade serous (HGS) tumors] by: (i) determination of the α-helical pitch angle via the single-axis molecular model, (ii) collagen alignment within fibrils via SHG anisotropy, and (iii) chirality via SHG circular dichroism (SHG-CD). Pixel approaches are required due to the complex structure of the matrix that lacks a high degree of fiber alignment. The largest differences in the helical pitch angle were between normal stroma and benign tumors, consistent with gene expression showing the Col III isoform is up-regulated in the latter. The data were not consistent with up-regulation of Col III in HGS tumors as previous reports have suggested. The different tissues also displayed differing SHG anisotropies and SHG-CD responses, consistent with either Col III incorporation or randomization of Col I alignment within benign and malignant tumors. Additionally, the high-grade tumors displayed higher collagen concentration, where this desmoplasia is consistent with the higher fiber density in these tissues. These results collectively indicate that the fibril assemblies are distinct in all tissues, where these differences likely result from the synthesis of collagen rather than remodeling of existing collagen. Importantly, these analyses are label-free and interrogate subresolution collagen structure on intact tissues, without the need for conventional structural biology tools.
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Affiliation(s)
- Kirby R. Campbell
- University of Wisconsin–Madison, Department of Biomedical Engineering, Madison, Wisconsin, United States
- University of Wisconsin–Madison, Laboratory for Optical and Computational Instrumentation, Madison, Wisconsin, United States
| | - Rajeev Chaudhary
- University of Wisconsin–Madison, Department of Biomedical Engineering, Madison, Wisconsin, United States
- University of Wisconsin–Madison, Laboratory for Optical and Computational Instrumentation, Madison, Wisconsin, United States
| | - Julia M. Handel
- University of Wisconsin–Madison, Department of Biomedical Engineering, Madison, Wisconsin, United States
| | - Manish S. Patankar
- University of Wisconsin–Madison, Department of Obstetrics and Gynecology, Madison, Wisconsin, United States
| | - Paul J. Campagnola
- University of Wisconsin–Madison, Department of Biomedical Engineering, Madison, Wisconsin, United States
- University of Wisconsin–Madison, Laboratory for Optical and Computational Instrumentation, Madison, Wisconsin, United States
- Address all correspondence to: Paul J. Campagnola, E-mail:
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14
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Radaelli F, D'Alfonso L, Collini M, Mingozzi F, Marongiu L, Granucci F, Zanoni I, Chirico G, Sironi L. μMAPPS: a novel phasor approach to second harmonic analysis for in vitro-in vivo investigation of collagen microstructure. Sci Rep 2017; 7:17468. [PMID: 29234132 PMCID: PMC5727101 DOI: 10.1038/s41598-017-17726-y] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/24/2017] [Accepted: 11/28/2017] [Indexed: 12/15/2022] Open
Abstract
Second Harmonic Generation (SHG) is a label-free imaging method used to monitor collagen organization in tissues. Due to its sensitivity to the incident polarization, it provides microstructural information otherwise unreachable by other intensity based imaging methods. We develop and test a Microscopic Multiparametric Analysis by Phasor projection of Polarization-dependent SHG (μMAPPS) that maps the features of the collagen architecture in tissues at the micrometer scale. μMAPPS retrieves pixel-by-pixel the collagen fibrils anisotropy and orientation by operating directly on two coupled phasor spaces, avoiding direct fitting of the polarization dependent SHG signal. We apply μMAPPS to fixed tissue sections and to the study of the collagen microscopic organization in tumors ex-vivo and in-vivo. We develop a clustering algorithm to automatically group pixels with similar microstructural features. μMAPPS can perform fast analyses of tissues and opens to future applications for in-situ diagnosis of pathologies and diseases that could assist histo-pathological evaluation.
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Affiliation(s)
- F Radaelli
- Dipartimento di Fisica, Università degli Studi di Milano-Bicocca, Piazza della Scienza 3, 20126, Milano, Italy
| | - L D'Alfonso
- Dipartimento di Fisica, Università degli Studi di Milano-Bicocca, Piazza della Scienza 3, 20126, Milano, Italy
| | - M Collini
- Dipartimento di Fisica, Università degli Studi di Milano-Bicocca, Piazza della Scienza 3, 20126, Milano, Italy. .,CNR - ISASI, Institute of Applied Sciences & Intelligent Systems, Via Campi Flegrei 34, Pozzuoli, NA, Italy.
| | - F Mingozzi
- Dipartimento di Biotecnologie e Bioscienze, Università degli Studi di Milano-Bicocca, Piazza della Scienza 2, 20126, Milano, Italy
| | - L Marongiu
- Dipartimento di Biotecnologie e Bioscienze, Università degli Studi di Milano-Bicocca, Piazza della Scienza 2, 20126, Milano, Italy
| | - F Granucci
- Dipartimento di Biotecnologie e Bioscienze, Università degli Studi di Milano-Bicocca, Piazza della Scienza 2, 20126, Milano, Italy
| | - I Zanoni
- Dipartimento di Biotecnologie e Bioscienze, Università degli Studi di Milano-Bicocca, Piazza della Scienza 2, 20126, Milano, Italy.,Harvard Medical School and Division of Gastroenterology, Boston Children's Hospital, Boston, MA, USA
| | - G Chirico
- Dipartimento di Fisica, Università degli Studi di Milano-Bicocca, Piazza della Scienza 3, 20126, Milano, Italy.,CNR - ISASI, Institute of Applied Sciences & Intelligent Systems, Via Campi Flegrei 34, Pozzuoli, NA, Italy
| | - L Sironi
- Dipartimento di Fisica, Università degli Studi di Milano-Bicocca, Piazza della Scienza 3, 20126, Milano, Italy.
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15
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Dow XY, DeWalt EL, Sullivan SZ, Schmitt PD, Ulcickas JRW, Simpson GJ. Imaging the Nonlinear Susceptibility Tensor of Collagen by Nonlinear Optical Stokes Ellipsometry. Biophys J 2017; 111:1361-1374. [PMID: 27705760 DOI: 10.1016/j.bpj.2016.05.055] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/04/2015] [Revised: 04/20/2016] [Accepted: 05/16/2016] [Indexed: 10/20/2022] Open
Abstract
Nonlinear optical Stokes ellipsometric (NOSE) microscopy was demonstrated for the analysis of collagen-rich biological tissues. NOSE is based on polarization-dependent second harmonic generation imaging. NOSE was used to access the molecular-level distribution of collagen fibril orientation relative to the local fiber axis at every position within the field of view. Fibril tilt-angle distribution was investigated by combining the NOSE measurements with ab initio calculations of the predicted molecular nonlinear optical response of a single collagen triple helix. The results were compared with results obtained previously by scanning electron microscopy, nuclear magnetic resonance imaging, and electron tomography. These results were enabled by first measuring the laboratory-frame Jones nonlinear susceptibility tensor, then extending to the local-frame tensor through pixel-by-pixel corrections based on local orientation.
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Affiliation(s)
- Ximeng Y Dow
- Department of Chemistry, Purdue University, West Lafayette, Indiana
| | - Emma L DeWalt
- Department of Chemistry, Purdue University, West Lafayette, Indiana
| | - Shane Z Sullivan
- Department of Chemistry, Purdue University, West Lafayette, Indiana
| | - Paul D Schmitt
- Department of Chemistry, Purdue University, West Lafayette, Indiana
| | | | - Garth J Simpson
- Department of Chemistry, Purdue University, West Lafayette, Indiana.
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16
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Campbell KR, Campagnola PJ. Wavelength-Dependent Second Harmonic Generation Circular Dichroism for Differentiation of Col I and Col III Isoforms in Stromal Models of Ovarian Cancer Based on Intrinsic Chirality Differences. J Phys Chem B 2017; 121:1749-1757. [PMID: 28170263 DOI: 10.1021/acs.jpcb.6b06822] [Citation(s) in RCA: 26] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Extensive remodeling of the extracellular matrix (ECM) occurs in many epithelial cancers. For example, in ovarian cancer, upregulation of collagen isoform type III has been linked to invasive forms of the disease, and this change may be a potential biomarker. To examine this possibility, we implemented wavelength-dependent second harmonic generation circular dichroism (SHG-CD) imaging microscopy to quantitatively determine changes in chirality in ECM models comprised of different Col I/Col III composition. In these models, Col III was varied between 0 and 40%, and we found increasing Col III results in reduced net chirality, consistent with structural biology studies of Col I and III in tissues where the isoforms comingle in the same fibrils. We further examined the wavelength dependence of the SHG-CD to both optimize the response and gain insight into the underlying mechanism. We found using shorter SHG excitation wavelengths resulted in increased SHG-CD sensitivity, where this is consistent with the electric-dipole-coupled oscillator model suggested previously for the nonlinear chirality response from thin films. Moreover, the sensitivity is further consistent with the wavelength dependency of SHG intensity fit to a two-state model of the two-photon absorption in collagen. We also provide experimental calibration protocols to implement the SHG-CD modality on a laser scanning microscope. We last suggest that the technique has broad applicability in probing a wide range of diseased states with changes in collagen molecular structure.
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Affiliation(s)
- Kirby R Campbell
- Department of Biomedical Engineering, University of Wisconsin-Madison , 1550 Engineering Drive, Madison, Wisconsin 53706, United States
| | - Paul J Campagnola
- Department of Biomedical Engineering, University of Wisconsin-Madison , 1550 Engineering Drive, Madison, Wisconsin 53706, United States
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17
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Förderer M, Georgiev T, Mosqueira M, Fink RHA, Vogel M. Functional second harmonic generation microscopy probes molecular dynamics with high temporal resolution. BIOMEDICAL OPTICS EXPRESS 2016; 7:525-541. [PMID: 26977360 PMCID: PMC4771469 DOI: 10.1364/boe.7.000525] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/18/2015] [Revised: 12/18/2015] [Accepted: 12/18/2015] [Indexed: 06/05/2023]
Abstract
Second harmonic generation (SHG) microscopy is a powerful tool for label free ex vivo or in vivo imaging, widely used to investigate structure and organization of endogenous SHG emitting proteins such as myosin or collagen. Polarization resolved SHG microscopy renders supplementary information and is used to probe different molecular states. This development towards functional SHG microscopy is calling for new methods for high speed functional imaging of dynamic processes. In this work we present two approaches with linear polarized light and demonstrate high speed line scan measurements of the molecular dynamics of the motor protein myosin with a time resolution of 1 ms in mammalian muscle cells. Such a high speed functional SHG microscopy has high potential to deliver new insights into structural and temporal molecular dynamics under ex vivo or in vivo conditions.
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Affiliation(s)
- Moritz Förderer
- Medical Biophysics Unit, Institute for Physiology and Pathophysiology, University of Heidelberg, Heidelberg, Germany;
| | - Tihomir Georgiev
- Medical Biophysics Unit, Institute for Physiology and Pathophysiology, University of Heidelberg, Heidelberg, Germany
| | - Matias Mosqueira
- Medical Biophysics Unit, Institute for Physiology and Pathophysiology, University of Heidelberg, Heidelberg, Germany
| | - Rainer H A Fink
- Medical Biophysics Unit, Institute for Physiology and Pathophysiology, University of Heidelberg, Heidelberg, Germany
| | - Martin Vogel
- Medical Biophysics Unit, Institute for Physiology and Pathophysiology, University of Heidelberg, Heidelberg, Germany; Current address: Max Planck Institute of Biophysics, Frankfurt/Main, Germany;
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18
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Bélanger E, Turcotte R, Daradich A, Sadetsky G, Gravel P, Bachand K, De Koninck Y, Côté DC. Maintaining polarization in polarimetric multiphoton microscopy. JOURNAL OF BIOPHOTONICS 2015; 8:884-888. [PMID: 25691172 DOI: 10.1002/jbio.201400116] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/25/2014] [Revised: 11/22/2014] [Accepted: 12/19/2014] [Indexed: 06/04/2023]
Abstract
Polarimetric measurements in multiphoton microscopy can reveal information about the local molecular order of a sample. However, the presence of a dichroic through which the excitation beam propagates will generally scramble its polarization. We propose a simple scheme whereby a second properly-oriented compensation dichroic is used to negate any alteration regardless of the wavelength and the initial polarization. We demonstrate how this robust and rapid approach simplifies polarimetric measurements in second-harmonic generation, two-photon excited fluorescence and coherent anti-Stokes Raman scattering. Illustration of the polarization maintaining strategy with the compensating dichroic oriented such that its s- and p-axes are interchanged with these of the primary dichroic.
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Affiliation(s)
- Erik Bélanger
- Centre de recherche de l'Institut universitaire en santé mentale de Québec (CRIUSMQ), Université Laval, Québec, Qc, Canada
| | - Raphaël Turcotte
- Centre de recherche de l'Institut universitaire en santé mentale de Québec (CRIUSMQ), Université Laval, Québec, Qc, Canada
| | - Amy Daradich
- Centre de recherche de l'Institut universitaire en santé mentale de Québec (CRIUSMQ), Université Laval, Québec, Qc, Canada
| | - Grégory Sadetsky
- Centre de recherche de l'Institut universitaire en santé mentale de Québec (CRIUSMQ), Université Laval, Québec, Qc, Canada
| | - Pierre Gravel
- Centre de recherche de l'Institut universitaire en santé mentale de Québec (CRIUSMQ), Université Laval, Québec, Qc, Canada
| | - Karine Bachand
- Centre de recherche de l'Institut universitaire en santé mentale de Québec (CRIUSMQ), Université Laval, Québec, Qc, Canada
| | - Yves De Koninck
- Centre de recherche de l'Institut universitaire en santé mentale de Québec (CRIUSMQ), Université Laval, Québec, Qc, Canada
- Centre d'optique, photonique et laser (COPL),, Université Laval, Québec, Qc, Canada
| | - Daniel C Côté
- Centre de recherche de l'Institut universitaire en santé mentale de Québec (CRIUSMQ), Université Laval, Québec, Qc, Canada.
- Centre d'optique, photonique et laser (COPL),, Université Laval, Québec, Qc, Canada.
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19
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Psilodimitrakopoulos S, Loza-Alvarez P, Artigas D. Fast monitoring of in-vivo conformational changes in myosin using single scan polarization-SHG microscopy. BIOMEDICAL OPTICS EXPRESS 2014; 5:4362-73. [PMID: 25574444 PMCID: PMC4285611 DOI: 10.1364/boe.5.004362] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/02/2014] [Revised: 11/20/2014] [Accepted: 11/20/2014] [Indexed: 05/18/2023]
Abstract
Fast imaging of molecular changes under high-resolution and label-free conditions are essential for understanding in-vivo processes, however, current techniques are not able to monitor such changes in real time. Polarization sensitive second harmonic generation (PSHG) imaging is a minimally invasive optical microscopy technique capable of quantifying molecular conformational changes occurring below the diffraction limit. Up to now, such information is generally retrieved by exciting the sample with different linear polarizations. This procedure requires the sample to remain static during measurements (from a few second to minutes), preventing the use of PSHG microscopy from studying moving samples or molecular dynamics in living organisms. Here we demonstrate an imaging method that is one order of magnitude faster than conventional PSHG. Based on circular polarization excitation and instantaneous polarimetry analysis of the second harmonic signal generated in the tissue, the method is able to instantaneously obtain molecular information within a pixel dwell time. As a consequence, a single scan is only required to retrieve all the information. This allowed us to perform PSHG imaging in moving C. elegans, monitoring myosin's dynamics during the muscular contraction and relaxation. Since the method provides images of the molecular state, an unprecedented global understanding of the muscles dynamics is possible by correlating changes in different regions of the sample.
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Affiliation(s)
| | - Pablo Loza-Alvarez
- ICFO-Institut de Ciències Fotòniques, Mediterranean Technology Park, 08860 Castelldefels (Barcelona),
Spain
| | - David Artigas
- ICFO-Institut de Ciències Fotòniques, Mediterranean Technology Park, 08860 Castelldefels (Barcelona),
Spain
- Department of Signal Theory and Communications, Universitat Politècnica de Catalunya, 08034,
Spain
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20
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DeWalt EL, Sullivan SZ, Schmitt PD, Muir RD, Simpson GJ. Polarization-modulated second harmonic generation ellipsometric microscopy at video rate. Anal Chem 2014; 86:8448-56. [PMID: 25050448 PMCID: PMC4139166 DOI: 10.1021/ac502124v] [Citation(s) in RCA: 37] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/09/2014] [Accepted: 07/22/2014] [Indexed: 11/29/2022]
Abstract
Fast 8 MHz polarization modulation coupled with analytical modeling, fast beam-scanning, and synchronous digitization (SD) have enabled simultaneous nonlinear optical Stokes ellipsometry (NOSE) and polarized laser transmittance imaging with image acquisition rates up to video rate. In contrast to polarimetry, in which the polarization state of the exiting beam is recorded, NOSE enables recovery of the complex-valued Jones tensor of the sample that describes all polarization-dependent observables of the measurement. Every video-rate scan produces a set of 30 images (10 for each detector with three detectors operating in parallel), each of which corresponds to a different polarization-dependent result. Linear fitting of this image set contracts it down to a set of five parameters for each detector in second harmonic generation (SHG) and three parameters for the transmittance of the incident beam. These parameters can in turn be used to recover the Jones tensor elements of the sample. Following validation of the approach using z-cut quartz, NOSE microscopy was performed for microcrystals of both naproxen and glucose isomerase. When weighted by the measurement time, NOSE microscopy was found to provide a substantial (>7 decades) improvement in the signal-to-noise ratio relative to our previous measurements based on the rotation of optical elements and a 3-fold improvement relative to previous single-point NOSE approaches.
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Affiliation(s)
- Emma L. DeWalt
- Department of Chemistry, Purdue University, 560 Oval Drive, West Lafayette, Indiana 47907, United
States
| | - Shane Z. Sullivan
- Department of Chemistry, Purdue University, 560 Oval Drive, West Lafayette, Indiana 47907, United
States
| | - Paul D. Schmitt
- Department of Chemistry, Purdue University, 560 Oval Drive, West Lafayette, Indiana 47907, United
States
| | - Ryan D. Muir
- Department of Chemistry, Purdue University, 560 Oval Drive, West Lafayette, Indiana 47907, United
States
| | - Garth J. Simpson
- Department of Chemistry, Purdue University, 560 Oval Drive, West Lafayette, Indiana 47907, United
States
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21
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Campagnola P, French PM, Georgakoudi I, Mycek MA. Introduction: feature issue on optical molecular probes, imaging, and drug delivery. BIOMEDICAL OPTICS EXPRESS 2014; 5:643-644. [PMID: 24575356 PMCID: PMC3920892 DOI: 10.1364/boe.5.000643] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/28/2014] [Indexed: 06/03/2023]
Abstract
The editors introduce the Biomedical Optics Express feature issue "Optical Molecular Probes, Imaging, and Drug Delivery," which is associated with a Topical Meeting of the same name held at the 2013 Optical Society of America (OSA) Optics in the Life Sciences Congress in Waikoloa Beach, Hawaii, April 14-18, 2013. The international meeting focused on the convergence of optical physics, photonics technology, nanoscience, and photochemistry with drug discovery and clinical medicine. Papers in this feature issue are representative of meeting topics, including advances in microscopy, nanotechnology, and optics in cancer research.
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Affiliation(s)
- Paul Campagnola
- Department of Biomedical Engineering, University of Wisconsin, Madison WI 53706, USA
| | | | - Irene Georgakoudi
- Biomedical Engineering Department, Tufts University, Medford MA 02155, USA
| | - Mary-Ann Mycek
- Department of Biomedical Engineering, Applied Physics Program, Univ. of Michigan, Ann Arbor MI 48109, USA
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