1
|
Visser D, Rogg K, Fuhrmann E, Marzi J, Schenke-Layland K, Hartmann H. Electrospinning of collagen: enzymatic and spectroscopic analyses reveal solvent-independent disruption of the triple-helical structure. J Mater Chem B 2023; 11:2207-2218. [PMID: 36786208 DOI: 10.1039/d2tb02602c] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Abstract
Electrospinning has become a well-established method for creating nanofibrous meshes for tissue-engineering applications. The incorporation of natural extracellular components, such as electrospun pure collagen nanofibers, has proven to be particularly challenging, as electrospun collagen nanofibers do not constitute native collagen fibers anymore. In this study, we show that this detrimental effect is not only limited to fluorinated solvents, as previously thought. Rat tail collagen was dissolved in acetic acid and ethanol and electrospun at various temperatures. Electrospun collagen mats were analyzed using circular dichroism, enzymatic digestion, SDS-PAGE, western blotting, and Raman spectroscopy and compared to heat-denaturated and electrospun collagen in HFIP. Our data suggest that even non-fluorinated electrospinning solvents, such as acid-based solvents, do not yield structurally intact fibers. Interestingly, neither epithelial cells nor fibroblasts displayed a different cellular response to electrospun collagen compared to collagen-coated polyurethane scaffolds in F-actin staining and metabolic analysis using fluorescent lifetime imaging. The disruption of the structural integrity of collagen might therefore be underestimated based on the cell-material interactions alone. These observations expose the larger than anticipated vulnerability of collagen in the electrospinning process. Based on these findings, the influence of the electrospinning process on the distinct biochemical properties of collagen should always be considered, when ECM-mimicking fibrous constructs are manufactured.
Collapse
Affiliation(s)
- Dmitri Visser
- NMI Natural and Medical Sciences Institute at the University of Tübingen, Markwiesenstrasse 55, 72770 Reutlingen, Germany.
| | - Katharina Rogg
- NMI Natural and Medical Sciences Institute at the University of Tübingen, Markwiesenstrasse 55, 72770 Reutlingen, Germany.
| | - Ellena Fuhrmann
- NMI Natural and Medical Sciences Institute at the University of Tübingen, Markwiesenstrasse 55, 72770 Reutlingen, Germany.
| | - Julia Marzi
- NMI Natural and Medical Sciences Institute at the University of Tübingen, Markwiesenstrasse 55, 72770 Reutlingen, Germany. .,Institute of Biomedical Engineering, Department for Medical Technologies & Regenerative Medicine, Eberhard Karls University Tübingen, 72076 Tübingen, Germany.,Cluster of Excellence iFIT (EXC 2180) "Image-Guided and Functionally Instructed Tumor Therapies", Eberhard Karls University Tübingen, 72076 Tübingen, Germany
| | - Katja Schenke-Layland
- NMI Natural and Medical Sciences Institute at the University of Tübingen, Markwiesenstrasse 55, 72770 Reutlingen, Germany. .,Institute of Biomedical Engineering, Department for Medical Technologies & Regenerative Medicine, Eberhard Karls University Tübingen, 72076 Tübingen, Germany.,Cluster of Excellence iFIT (EXC 2180) "Image-Guided and Functionally Instructed Tumor Therapies", Eberhard Karls University Tübingen, 72076 Tübingen, Germany
| | - Hanna Hartmann
- NMI Natural and Medical Sciences Institute at the University of Tübingen, Markwiesenstrasse 55, 72770 Reutlingen, Germany.
| |
Collapse
|
2
|
Zhang Y, Geng F, Wang Y, Cao J. Textural modification of Chinese traditional stewed pig trotter: Effect of acid or alkaline-induced degradation of collagen fibers. J Texture Stud 2022; 54:268-275. [PMID: 36502368 DOI: 10.1111/jtxs.12735] [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: 10/11/2022] [Revised: 12/05/2022] [Accepted: 12/07/2022] [Indexed: 12/14/2022]
Abstract
This study aimed to investigate the effects of acid or alkaline treatments on the textural properties of Chinese traditional stewed pig trotter in relation to the degradation of collagen fibers. Pig trotters were subjected to different pHs of 4, 5, 6, 7, and 8 and then stewed at 95°C for 60 min. Textural parameters (springiness, chewiness, hardness, and gumminess) of pig trotters and Raman spectroscopy, cross-links, decorin, and glycosaminoglycans contents of collagen fibers were assessed. The acid or alkaline treatments at pH 4, 5, 6, and 8 improved the textural properties evidenced by lower chewiness, hardness, and gumminess, and promoted the unfolding of the secondary structure evidenced by a loss of α-helix paralleled with an increase of random coil, as well as induced a breakage to the covalent cross-links evidenced by the reduction of cross-links, decorin, and glycosaminoglycans. This study thus concluded positive effects of acid or alkaline treatments on the textural modification of Chinese traditional stewed pig trotter in relation to the induced degradation of the collagen fibers.
Collapse
Affiliation(s)
- Yuemei Zhang
- Beijing Engineering and Technology Research Center of Food Additives, School of Food and Health, Beijing Technology and Business University, Beijing, China
| | - Fang Geng
- Meat Processing Key Laboratory of Sichuan Province, School of Food and Biological Engineering, Chengdu University, Chengdu, China
| | - Ying Wang
- Beijing Engineering and Technology Research Center of Food Additives, School of Food and Health, Beijing Technology and Business University, Beijing, China
| | - Jinxuan Cao
- Beijing Engineering and Technology Research Center of Food Additives, School of Food and Health, Beijing Technology and Business University, Beijing, China
| |
Collapse
|
3
|
Potapov AL, Sirotkina MA, Matveev LA, Dudenkova VV, Elagin VV, Kuznetsov SS, Karabut MM, Komarova AD, Vagapova NN, Safonov IK, Kuznetsova IA, Radenska-Lopovok SG, Zagaynova EV, Gladkova ND. Multiphoton microscopy assessment of the structure and variability changes of dermal connective tissue in vulvar lichen sclerosus: A pilot study. JOURNAL OF BIOPHOTONICS 2022; 15:e202200036. [PMID: 35652856 DOI: 10.1002/jbio.202200036] [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: 02/10/2022] [Revised: 04/17/2022] [Accepted: 05/31/2022] [Indexed: 06/15/2023]
Abstract
In this article, we offer a novel classification of progressive changes in the connective tissue of dermis in vulvar lichen sclerosus (VLS) relying on quantitative assessment of the second harmonic generation (SHG) signal received from formalin fixed and deparaffinized tissue sections. We formulate criteria for distinguishing four degrees of VLS development: Initial-Mild-Moderate-Severe. Five quantitative characteristics (length and thickness type I Collagen fibers, Mean SHG signal intensity, Skewness and Coherence SHG signal) are used to describe the sequential degradation of connective tissue (changes in the structure, orientation, shape and density of collagen fibers) up to the formation of specific homogeneous masses. Each of the degrees has a characteristic set of quantitatively expressed features. We focus on the identification and description of early, initial changes of the dermis as the least specific. The results obtained by us and the proposed classification of the degrees of the disease can be used to objectify the dynamics of tissue changes during treatment.
Collapse
Affiliation(s)
| | | | - Lev A Matveev
- Institute of Applied Physics Russian Academy of Sciences, Nizhny Novgorod, Russia
| | | | - Vadim V Elagin
- Privolzhsky Research Medical University, Nizhny Novgorod, Russia
| | - Sergey S Kuznetsov
- N.A. Semashko Nizhny Novgorod Regional Clinical Hospital, Nizhny Novgorod, Russia
| | - Maria M Karabut
- Privolzhsky Research Medical University, Nizhny Novgorod, Russia
| | - Anastasia D Komarova
- Privolzhsky Research Medical University, Nizhny Novgorod, Russia
- Lobachevsky State University of Nizhny Novgorod, Nizhny Novgorod, Russia
| | - Nailya N Vagapova
- N.A. Semashko Nizhny Novgorod Regional Clinical Hospital, Nizhny Novgorod, Russia
| | - Ivan K Safonov
- Privolzhsky Research Medical University, Nizhny Novgorod, Russia
| | - Irina A Kuznetsova
- N.A. Semashko Nizhny Novgorod Regional Clinical Hospital, Nizhny Novgorod, Russia
| | | | - Elena V Zagaynova
- Privolzhsky Research Medical University, Nizhny Novgorod, Russia
- Lobachevsky State University of Nizhny Novgorod, Nizhny Novgorod, Russia
| | | |
Collapse
|
4
|
Wang Y, Sheng Y, Zhang Y, Geng F, Cao J. Effect of High Pressure/Heating Combination on the Structure and Texture of Chinese Traditional Pig Trotter Stewed with Soy Sauce. Foods 2022; 11:foods11152248. [PMID: 35954017 PMCID: PMC9368740 DOI: 10.3390/foods11152248] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/01/2022] [Revised: 07/09/2022] [Accepted: 07/17/2022] [Indexed: 02/01/2023] Open
Abstract
In order to clarify the effect of a high pressure/heating combination on the texture of Chinese traditional pig trotter with soy sauce, textural parameters (springiness, chewiness, hardness, and gumminess), the secondary structures, cross-links, decorin (DCN), glycosaminoglycans (GAGs) levels, and the histochemical morphology of collagen fibers under different treatments (0.1 MPa, 150 MPa, 300 MPa, 0.1 MPa + 50 °C, 150 MPa + 50 °C, and 300 MPa + 50 °C) were assessed. At room temperature, the 150 and 300 MPa treatments increased the hardness and chewiness of the pig trotter with weak denaturation of collagen proteins compared with the control group. Textural parameters were improved at 300 MPa + 50 °C, accompanied by an ultrastructural collapse of collagen fibers, the reduction in cross-links, DCN and GAGs levels, and unfolded triple-helix structure. We concluded that the positive effects on the textural parameters of pig trotters by a combination of treatments could be attributed to the collapse of collagen structure.
Collapse
Affiliation(s)
- Ying Wang
- Department of Food Science and Technology, School of Food and Health, Beijing Technology and Business University, Beijing 100048, China; (Y.W.); (Y.Z.)
| | - Yanan Sheng
- Department of Food Science and Technology, Ningbo University, Ningbo 315211, China;
| | - Yuemei Zhang
- Department of Food Science and Technology, School of Food and Health, Beijing Technology and Business University, Beijing 100048, China; (Y.W.); (Y.Z.)
| | - Fang Geng
- Meat Processing Key Laboratory of Sichuan Province, School of Food and Biologicalengineering, Chengdu University, Chengdu 610106, China;
| | - Jinxuan Cao
- Department of Food Science and Technology, School of Food and Health, Beijing Technology and Business University, Beijing 100048, China; (Y.W.); (Y.Z.)
- Correspondence: ; Tel.: +86-18758823803
| |
Collapse
|
5
|
Physicochemical and quality characteristics of New Zealand goat meat and its ultrastructural features. Food Res Int 2022; 161:111736. [DOI: 10.1016/j.foodres.2022.111736] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/02/2022] [Revised: 06/14/2022] [Accepted: 07/21/2022] [Indexed: 11/24/2022]
|
6
|
Lin Y, Wang Y, Jin G, Duan J, Zhang Y, Cao J. The Texture Change of Chinese Traditional Pig Trotter with Soy Sauce during Stewing Processing: Based on a Thermal Degradation Model of Collagen Fibers. Foods 2022; 11:foods11121772. [PMID: 35741970 PMCID: PMC9223209 DOI: 10.3390/foods11121772] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/26/2022] [Revised: 05/29/2022] [Accepted: 06/10/2022] [Indexed: 01/12/2023] Open
Abstract
In order to clarify the influence of the thermal degradation of collagen fibers on the texture profile analysis (TPA) parameters of pig trotter stewed with soy sauce (PTSWSS), TPA (springiness, chewiness, hardness, and gumminess), the secondary structures, the cross-linkage, decorin (DCN) and glycosaminoglycan (GAG) levels, and the histochemical morphology of collagen fibers during the stewing process (0, 30, 60, 120 min) were assessed. The springiness and hardness increased after 30 min of stewing, along with the denaturation of collagen proteins. TPA parameters improved with the prolonged stewing times of 60 and 120 min, along with the ultra-structural dissolution of collagen fibers, and a substantial reduction in cross-linkage, DCN, and GAG levels, and the unfolded triple-helix structure. This study concluded that the TPA parameters of PTSWSS were dependent on the stewing time, and that the improvement in TPA parameters with longer stewing time could primarily be attributed to the thermal degradation of collagen fibers.
Collapse
Affiliation(s)
- Yuhai Lin
- Hormel (China) Investment Co., Ltd., Jiaxing 314001, China; (Y.L.); (J.D.)
- School of Food and Health, Beijing Technology and Business University, Beijing 100048, China; (Y.W.); (G.J.); (Y.Z.)
| | - Ying Wang
- School of Food and Health, Beijing Technology and Business University, Beijing 100048, China; (Y.W.); (G.J.); (Y.Z.)
| | - Guofeng Jin
- School of Food and Health, Beijing Technology and Business University, Beijing 100048, China; (Y.W.); (G.J.); (Y.Z.)
| | - Junjie Duan
- Hormel (China) Investment Co., Ltd., Jiaxing 314001, China; (Y.L.); (J.D.)
| | - Yuemei Zhang
- School of Food and Health, Beijing Technology and Business University, Beijing 100048, China; (Y.W.); (G.J.); (Y.Z.)
| | - Jinxuan Cao
- School of Food and Health, Beijing Technology and Business University, Beijing 100048, China; (Y.W.); (G.J.); (Y.Z.)
- College of Food and Biological Engineering, Chengdu University, Chengdu 610106, China
- Correspondence: ; Tel.: +86-18758823803
| |
Collapse
|
7
|
Huang SY, Hsieh PY, Chung CJ, Chou CM, He JL. Nanoarchitectonics for Ultrathin Gold Films Deposited on Collagen Fabric by High-Power Impulse Magnetron Sputtering. NANOMATERIALS 2022; 12:nano12101627. [PMID: 35630849 PMCID: PMC9143808 DOI: 10.3390/nano12101627] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 04/15/2022] [Revised: 05/07/2022] [Accepted: 05/07/2022] [Indexed: 11/16/2022]
Abstract
Gold nanoparticles conjugated with collagen molecules and fibers have been proven to improve structure strength, water and enzyme degradation resistance, cell attachment, cell proliferation, and skin wound healing. In this study, high-power impulse magnetron sputtering (HiPIMS) was used to deposit ultrathin gold films (UTGF) and discontinuous island structures on type I collagen substrates. A long turn-off time of duty cycle and low chamber temperature of HiPIMS maintained substrate morphology. Increasing the deposition time from 6 s to 30 s elevated the substrate surface coverage by UTGF up to 91.79%, as observed by a field emission scanning electron microscope. X-ray diffractometry analysis revealed signature low and wide peaks for Au (111). The important surface functional groups and signature peaks of collagen substrate remained unchanged according to Fourier transform infrared spectroscopy results. Multi-peak curve fitting of the Amide I spectrum revealed the non-changed protein secondary structure of type I collagen, which mainly consists of α-helix. Atomic force microscopy observation showed that the roughness average value shifted from 1.74 to 4.17 nm by increasing the deposition time from 13 s to 77 s. The uneven surface of collagen substrate made quantification of thin film thickness by AFM difficult. Instead, UTGF thickness was measured using simultaneously deposited glass specimens placed in an HiPIMS chamber with collagen substrates. Film thickness was 3.99 and 10.37 nm at deposition times of 13 and 77 s, respectively. X-ray photoelectron spectroscopy showed preserved substrate elements on the surface. Surface water contact angle measurement revealed the same temporary hydrophobic behavior before water absorption via exposed collagen substrates, regardless of deposition time. In conclusion, HiPIMS is an effective method to deposit UTGF on biomedical materials such as collagen without damaging valuable substrates. The composition of two materials could be further used for biomedical purposes with preserved functions of UTGF and collagen.
Collapse
Affiliation(s)
- Sheng-Yang Huang
- Department of Materials Science and Engineering, Feng Chia University, 100, Wenhwa Rd., Seatwen District, Taichung 40724, Taiwan; (S.-Y.H.); (P.-Y.H.)
- Department of Surgery, Taichung Veterans General Hospital, 1650, Sec. 4, Taiwan Boulevard, Seatwen District, Taichung 40705, Taiwan
- Department of Medicine, National Yang-Ming University, 155, Sec.2, Linong Street, Beitou District, Taipei 11221, Taiwan
| | - Ping-Yen Hsieh
- Department of Materials Science and Engineering, Feng Chia University, 100, Wenhwa Rd., Seatwen District, Taichung 40724, Taiwan; (S.-Y.H.); (P.-Y.H.)
| | - Chi-Jen Chung
- Department of Dental Technology and Materials Science, Central Taiwan University of Science and Technology, 666, Buzih Rd., Beitun District, Taichung 40601, Taiwan;
| | - Chia-Man Chou
- Department of Surgery, Taichung Veterans General Hospital, 1650, Sec. 4, Taiwan Boulevard, Seatwen District, Taichung 40705, Taiwan
- Department of Medicine, National Yang-Ming University, 155, Sec.2, Linong Street, Beitou District, Taipei 11221, Taiwan
- Correspondence: ; Tel.: +886-4-23592525 (ext. 5182)
| | - Ju-Liang He
- Institute of Plasma, Feng Chia University, 100, Wenhwa Rd., Seatwen District, Taichung 40724, Taiwan;
| |
Collapse
|
8
|
Mikula ER, Raksi F, Ahmed II, Sharma M, Holland G, Khazaeinezhad R, Bradford S, Jester JV, Juhasz T. Femtosecond Laser Trabeculotomy in Perfused Human Cadaver Anterior Segments: A Novel, Noninvasive Approach to Glaucoma Treatment. Transl Vis Sci Technol 2022; 11:28. [PMID: 35333286 PMCID: PMC8963660 DOI: 10.1167/tvst.11.3.28] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022] Open
Abstract
Purpose The purpose of this study was to investigate femtosecond laser trabeculotomy (FLT) in a clinically relevant manner (i.e., delivering the surgical laser beam through the cornea of the intact, human anterior segment to create channels from the anterior chamber into the Schlemm's canal) and to investigate the effect of this treatment on intraocular pressure in perfused human anterior segments. Methods Perfused human anterior segments (15 eyes) received either FLT treatment (n = 8) or a sham-treatment (n = 7). Intraocular pressure (IOP) in the perfused samples was recorded before and after treatment. Spectral domain optical coherence tomography, second harmonic generation imaging, and transmission electron microscopy were used to investigate the FLT channels. Results The FLT group (n = 7, 1 eye excluded) had a statistically significant reduction in mean IOP of 20.2% from baseline after treatment (5.06 ± 1.46 mm Hg to 4.04 ± 1.63 mm Hg; P < 0.0005), whereas the control group (n = 7) remained statistically unchanged (7.72 ± 3.45 mm Hg to 7.78 ± 3.51 mm Hg; P < 0.71). Imaging confirmed that the channels traversed the entire trabecular meshwork into the Schlemm's canal. Conclusions This study has provided the first direct evidence supporting the feasibility of clinically applicable, noninvasive femtosecond laser trabeculotomy for the treatment of glaucoma. Various imaging modalities revealed minimal collateral damage to adjacent issues. Translational Relevance This work demonstrates noninvasive femtosecond laser trabeculotomy in a laboratory setting that is clinically relevant.
Collapse
Affiliation(s)
- Eric R Mikula
- Department of Ophthalmology, University of California, Irvine, Irvine, CA, USA.,ViaLase Inc., Aliso Viejo, CA, USA
| | | | - Iqbal Ike Ahmed
- University of Toronto, Toronto, ON, Canada.,University of Utah, Salt Lake City, UT, USA
| | | | | | | | - Samantha Bradford
- Department of Ophthalmology, University of California, Irvine, Irvine, CA, USA
| | - James V Jester
- Department of Ophthalmology, University of California, Irvine, Irvine, CA, USA.,Department of Biomedical Engineering, University of California, Irvine, Irvine, CA, USA
| | - Tibor Juhasz
- Department of Ophthalmology, University of California, Irvine, Irvine, CA, USA.,Department of Biomedical Engineering, University of California, Irvine, Irvine, CA, USA.,ViaLase Inc., Aliso Viejo, CA, USA
| |
Collapse
|
9
|
Biaxial mechanics of thermally denaturing skin - Part 1: Experiments. Acta Biomater 2022; 140:412-420. [PMID: 34560301 DOI: 10.1016/j.actbio.2021.09.033] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/04/2021] [Revised: 09/14/2021] [Accepted: 09/17/2021] [Indexed: 12/29/2022]
Abstract
The mechanics of collagenous soft tissues, such as skin, are sensitive to heat. Thus, quantifying and modeling thermo-mechanical coupling of skin is critical to our understanding of skin's physiology, pathophysiology, and its treatment. However, key gaps persist in our knowledge about skin's coupled thermo-mechanics. Among them, we haven't quantified the role of skin's microstructural organization in its response to superphysiological loading. To fill this gap, we conducted a comprehensive set of experiments in which we combined biaxial mechanical testing with histology and two-photon imaging under liquid heat treatment at temperatures ranging from 37∘C to 95∘C lasting between 2 seconds and 5 minutes. Among other observations, we found that unconstrained skin, when exposed to high temperatures, shrinks anisotropically with the principal direction of shrinkage being aligned with collagen's principal orientation. Additionally, we found that when skin is isometrically constrained, it produces significant forces during denaturation that are also anisotropic. Finally, we found that denaturation significantly alters the mechanical behavior of skin. For short exposure times, this alteration is reflected in a reduction of stiffness at high strains. At long exposure times, the tissue softened to a point where it became untestable. We supplemented our findings with confirmation of collagen denaturation in skin via loss of birefringence and second harmonic generation. Finally, we captured all time-, temperature-, and direction-dependent experimental findings in a hypothetical model. Thus, this work fills a fundamental gap in our current understanding of skin thermo-mechanics and will support future developments in thermal injury prevention, thermal injury management, and thermal therapeutics of skin. STATEMENT OF SIGNIFICANCE: Our work experimentally explores how skin reacts to being heated. That is, it measures how much skin shrinks, what forces it produces, and how its mechanical properties change; all as a function of temperature, but also of direction and time. Additionally, our work connects these measurements to changes in skin's microscopic make-up. This knowledge is important to our understanding of skin's function and dysfunction, especially during burn injuries or heat-dependent treatments.
Collapse
|
10
|
Rausch M, Meador WD, Toaquiza-Tubon J, Moreno-Flores O, Tepole AB. Biaxial mechanics of thermally denaturing skin - Part 2: Modeling. Acta Biomater 2022; 140:421-433. [PMID: 34856415 DOI: 10.1016/j.actbio.2021.11.031] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/04/2021] [Revised: 11/02/2021] [Accepted: 11/22/2021] [Indexed: 11/01/2022]
Abstract
Understanding the response of skin to superphysiological temperatures is critical to the diagnosis and prognosis of thermal injuries, and to the development of temperature-based medical therapeutics. Unfortunately, this understanding has been hindered by our incomplete knowledge about the nonlinear coupling between skin temperature and its mechanics. In Part I of this study we experimentally demonstrated a complex interdependence of time, temperature, direction, and load in skin's response to superphysiological temperatures. In Part II of our study, we test two different models of skin's thermo-mechanics to explain our observations. In both models we assume that skin's response to superphysiological temperatures is governed by the denaturation of its highly collageneous microstructure. Thus, we capture skin's native mechanics via a microstructurally-motivated strain energy function which includes probability distributions for collagen fiber orientation and waviness. In the first model, we capture skin's response to superphysiological temperatures as a transition between two states that link the kinetics of collagen fiber denaturation to fiber coiling and to the transformation of each fiber's constitutive behavior from purely elastic to viscoelastic. In the second model, we capture skin's response to superphysiological temperatures instead via three states in which a sequence of two reactions link the kinetics of collagen fiber denaturation to fiber coiling, followed by a state of fiber damage. Given the success of both models in qualitatively and quantitatively capturing our observations, we expect that our work will provide guidance for future experiments that could probe each model's assumptions toward a better understanding of skin's coupled thermo-mechanics and that our work will be used to guide the engineering design of heat treatment therapies. STATEMENT OF SIGNIFICANCE: Quantifying and modeling skin thermo-mechanics is critical to our understanding of skin physiology, pathophysiology, as well as heat-based treatments. This work addresses a lack of theoretical and computational models of the coupled thermo-mechanics of skin. Our model accounts for skin microstructure through modeling the probability of fiber orientation and fiber stress-free states. Denaturing induces changes in the stress-free configuration of collagen, as well as changes in fiber stiffness and viscoelastic properties. We propose two competing models that fit all of our experimental observations. These models will enable future developments of thermal-therapeutics, prevention and management of skin thermal injuries, and set a foundation for improved mechanistic models of skin thermo-mechanics.
Collapse
|
11
|
Microscale compressive behavior of hydrated lamellar bone at high strain rates. Acta Biomater 2021; 131:403-414. [PMID: 34245895 DOI: 10.1016/j.actbio.2021.07.005] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/10/2021] [Revised: 06/30/2021] [Accepted: 07/02/2021] [Indexed: 11/20/2022]
Abstract
The increased risk of fracture in the elderly associated with metabolic conditions like osteoporosis poses a significant strain on health care systems worldwide. Due to bone's hierarchical nature, it is necessary to study its mechanical properties and failure mechanisms at several length scales. We conducted micropillar compression experiments on ovine cortical bone to assess the anisotropic mechanical response at the lamellar scale over a wide range of strain rates (10-4 to 8·102 s-1). At the microscale, lamellar bone exhibits a strain rate sensitivity similar to what is reported at the macroscale suggesting that it is an intrinsic property of the extracellular matrix. Significant shear band thickening was observed at high strain rates by HRSEM and STEM imaging. This is likely caused by the material's inability to accommodate the imposed deformation by propagation of thin kink bands and shear cracks at high strain rates, leading to shear band thickening and nucleation. The post-yield behavior is strain rate and direction dependent: hardening was observed for transverse oriented micropillars and hardening modulus increases with strain rate by a factor of almost 2, while axially oriented micropillars showed strain softening and an increase of the softening peak width and work to ultimate stress as a function of strain rate. This suggests that for compression at the micrometer scale, energy absorption in bone increases with strain rate. This study highlights the importance of investigating bone strength and post-yield behavior at lower length scales, under hydrated conditions and at clinically relevant strain rates. STATEMENT OF SIGNIFICANCE: We performed micropillar compression experiments of ovine cortical bone at two different orientations and over seven orders of magnitude of strain rate. Experiments were performed under humid condition to mimic the natural conditions of bone in a human body using a newly developed micro-indenter setup. The strain rate sensitivity was found to be of a similar magnitude to what has been reported for higher length scales, suggesting that the strain rate sensitivity is an intrinsic property of the bone extracellular matrix. In addition, localized shear deformation in thick bands was observed for the first time at high strain rates, highlighting the importance of investigating bone under conditions representative of an accident or fall at several length scales.
Collapse
|
12
|
McPhee S, Groetsch A, Shephard JD, Wolfram U. Heat impact during laser ablation extraction of mineralised tissue micropillars. Sci Rep 2021; 11:11007. [PMID: 34040009 PMCID: PMC8155055 DOI: 10.1038/s41598-021-89181-9] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/18/2021] [Accepted: 04/21/2021] [Indexed: 02/04/2023] Open
Abstract
The underlying constraint of ultrashort pulsed laser ablation in both the clinical and micromachining setting is the uncertainty regarding the impact on the composition of material surrounding the ablated region. A heat model representing the laser-tissue interaction was implemented into a finite element suite to assess the cumulative temperature response of bone during ultrashort pulsed laser ablation. As an example, we focus on the extraction of mineralised collagen fibre micropillars. Laser induced heating can cause denaturation of the collagen, resulting in ultrastructural loss which could affect mechanical testing results. Laser parameters were taken from a used micropillar extraction protocol. The laser scanning pattern consisted of 4085 pulses, with a final radial pass being 22 [Formula: see text] away from the micropillar. The micropillar temperature was elevated to 70.58 [Formula: see text], remaining 79.42 [Formula: see text] lower than that of which we interpret as an onset for denaturation. We verified the results by means of Raman microscopy and Energy Dispersive X-ray Microanalysis and found the laser-material interaction had no effect on the collagen molecules or mineral nanocrystals that constitute the micropillars. We, thus, show that ultrashort pulsed laser ablation is a safe and viable tool to fabricate bone specimens for mechanical testing at the micro- and nanoscale and we provide a computational model to efficiently assess this.
Collapse
Affiliation(s)
- Samuel McPhee
- Institute of Mechanical, Process and Energy Engineering, School of Engineering and Physical Sciences, Heriot-Watt University, Edinburgh, UK
| | - Alexander Groetsch
- Institute of Mechanical, Process and Energy Engineering, School of Engineering and Physical Sciences, Heriot-Watt University, Edinburgh, UK
- Swiss Federal Laboratories for Materials Science and Technology, Laboratory for Mechanics of Materials and Nanostructures, Thun, Switzerland
| | - Jonathan D Shephard
- Institute of Photonics and Quantum Sciences, School of Engineering and Physical Sciences, Heriot-Watt University, Edinburgh, UK
| | - Uwe Wolfram
- Institute of Mechanical, Process and Energy Engineering, School of Engineering and Physical Sciences, Heriot-Watt University, Edinburgh, UK.
| |
Collapse
|
13
|
Abid U, Gill YQ, Irfan MS, Umer R, Saeed F. Potential applications of polycarbohydrates, lignin, proteins, polyacids, and other renewable materials for the formulation of green elastomers. Int J Biol Macromol 2021; 181:1-29. [PMID: 33744249 DOI: 10.1016/j.ijbiomac.2021.03.057] [Citation(s) in RCA: 14] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/04/2020] [Revised: 02/24/2021] [Accepted: 03/10/2021] [Indexed: 12/18/2022]
Abstract
Renewable resources including polycarbohydrates, lignin, proteins, and polyacids are the intrinsically valuable class of materials that are naturally available in great quantities. Their utilization as green additives and reinforcing bio-fillers, in substitution of environmentally perilous petroleum-based fillers, for developing high-performance green rubber blends and composites is presently a highly tempting option. Blending of these renewable materials with elastomers is not straight-forward and research needs to exploit the high functionality of carbohydrates and other natural materials as proper physicochemical interactions are essential. Correlating and understanding the structural properties of lignin, carbohydrates, polyacids, and other biopolymers, before their incorporation in elastomers, is a potential approach towards the development of green elastomers for value-added applications. Promising properties i.e., biodegradability, biocompatibility, morphological characteristics, high mechanical properties, thermal stability, sustainability, and various other characteristics along with recent advancements in the development of green elastomers are reviewed in this paper. Structures, viability, interactions, properties, and use of most common natural polycarbohydrates (chitosan and starch), lignin, and proteins (collagen and gelatin) for elastomer modification are extensively reviewed. Challenges in commercialization, applications, and future perspectives of green elastomers are also discussed. Sustainability analysis of green elastomers is accomplished to elaborate their cost-effectiveness and environmental friendliness.
Collapse
Affiliation(s)
- Umer Abid
- Department of Polymer and Process Engineering, University of Engineering and Technology, G. T. Road, PO Box 54890, Lahore, Pakistan.
| | - Yasir Qayyum Gill
- Department of Polymer and Process Engineering, University of Engineering and Technology, G. T. Road, PO Box 54890, Lahore, Pakistan.
| | - Muhammad Shafiq Irfan
- Department of Polymer and Process Engineering, University of Engineering and Technology, G. T. Road, PO Box 54890, Lahore, Pakistan; Department of Aerospace Engineering, Khalifa University of Science and Technology, PO Box 127788, Abu Dhabi, United Arab Emirates.
| | - Rehan Umer
- Department of Aerospace Engineering, Khalifa University of Science and Technology, PO Box 127788, Abu Dhabi, United Arab Emirates.
| | - Farhan Saeed
- Department of Polymer and Process Engineering, University of Engineering and Technology, G. T. Road, PO Box 54890, Lahore, Pakistan.
| |
Collapse
|
14
|
Latorre ME, Velazquez DE. Effects of thermal treatment on collagen present in bovine M. Semitendinosus intramuscular connective tissue. Analysis of the chemical, thermal and mechanical properties. FOOD STRUCTURE 2021. [DOI: 10.1016/j.foostr.2020.100165] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
|
15
|
Lin AH, Allan AN, Zitnay JL, Kessler JL, Yu SM, Weiss JA. Collagen denaturation is initiated upon tissue yield in both positional and energy-storing tendons. Acta Biomater 2020; 118:153-160. [PMID: 33035697 DOI: 10.1016/j.actbio.2020.09.056] [Citation(s) in RCA: 14] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/11/2020] [Revised: 09/04/2020] [Accepted: 09/30/2020] [Indexed: 12/12/2022]
Abstract
Tendons are collagenous soft tissues that transmit loads between muscles and bones. Depending on their anatomical function, tendons are classified as positional or energy-storing with differing biomechanical and biochemical properties. We recently demonstrated that during monotonic stretch of positional tendons, permanent denatured collagen begins accumulating upon departing the linear region of the stress-strain curve. However, it is unknown if this observation is true during mechanical overload of other types of tendons. Therefore, the purpose of this study was to investigate the onset of collagen denaturation relative to applied strain, and whether it differs between the two tendon types. Rat tail tendon (RTT) fascicles and rat flexor digitorum longus (FDL) tendons represented positional and energy-storing tendons, respectively. The samples were stretched to incremental levels of strain, then stained with fluorescently labeled collagen hybridizing peptides (CHPs); the CHP fluorescence was measured to quantify denatured collagen. Denatured collagen in both positional and energy-storing tendons began to increase at the yield strain, upon leaving the linear region of the stress-strain curve as the sample started to permanently deform. Despite significant differences between the two tendon types, it appears that collagen denaturation is initiated at tissue yield during monotonic stretch, and the fundamental mechanism of failure is the same for the two types of tendons. At tissue failure, positional tendons had double the percentage of denatured collagen compared to energy-storing tendons, with no difference between 0% control groups. These results help to elucidate the etiology of subfailure injury and rupture in functionally distinct tendons.
Collapse
Affiliation(s)
- Allen H Lin
- Department of Biomedical Engineering, University of Utah, United States; Scientific Computing and Imaging Institute, University of Utah, United States
| | - Alexandra N Allan
- Department of Biomedical Engineering, University of Utah, United States; Scientific Computing and Imaging Institute, University of Utah, United States
| | - Jared L Zitnay
- Department of Biomedical Engineering, University of Utah, United States; Scientific Computing and Imaging Institute, University of Utah, United States
| | - Julian L Kessler
- Department of Biomedical Engineering, University of Utah, United States
| | - S Michael Yu
- Department of Biomedical Engineering, University of Utah, United States; Department of Pharmaceutics and Pharmaceutical Chemistry, University of Utah, United States
| | - Jeffrey A Weiss
- Department of Biomedical Engineering, University of Utah, United States; Scientific Computing and Imaging Institute, University of Utah, United States; Department of Orthopaedics, University of Utah, United States.
| |
Collapse
|
16
|
Derman İD, Şenel EC, Ferhanoğlu O, Çilesiz İ, Kazanci M. Effect of Heat Level and Expose Time on Denaturation of Collagen Tissues. Cell Mol Bioeng 2020; 14:113-119. [PMID: 33643470 DOI: 10.1007/s12195-020-00653-w] [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: 07/15/2020] [Accepted: 09/16/2020] [Indexed: 10/23/2022] Open
Abstract
Introduction The applied heat level and expose time are main issues in certain operations/applications, such as a laser assisted tissue welding, preparation of collagen-based biomaterials (films, implants). Therefore, the precise investigation of these parameters is crucial. The results can serve as a guideline to assess potential effects while maintaining the functionality of the collagen structures. Methods Collagen tissues from rat-tail tendon, calfskin, and bones are soaked in buffer solutions, then examined by microscope at different temperature levels. Results Increase in temperature reduced the microscopically observed collagen crimp contrast for calfskin and rat-tail tendons but not for bone tissues. The contrast level for rat tail tendon decreased down to 80% of its initial value at 37, 157, and 266 s for 70, 65, and 60 °C, respectively. The decrease in the crimp contrast was about only 25% and 2% at 55 and 50 °C after 2 h, respectively. 50% drop in contrast level was occurred for the skin samples at 16, 90, 110 and 1900 s for 70, 65, and 60 °C, respectively. The bone samples, did not show any significant differences in contrast levels. Conclusion The observed denaturation behaviours are in line with Arrhenius Law. This study could be expanded on to other types of tissues at wider temperature ranges to make a guideline for biological/medical processes that radiate heat in order to assess their side effects on collagen and other proteins.
Collapse
Affiliation(s)
- İrem Deniz Derman
- Electronics and Communication Engineering, Istanbul Technical University, 34469 Istanbul, Turkey.,Biomedical Engineering Graduate Program, Istanbul Technical University, 34469 Istanbul, Turkey
| | - Esat Can Şenel
- Electronics and Communication Engineering, Istanbul Technical University, 34469 Istanbul, Turkey.,Biomedical Engineering Graduate Program, Istanbul Technical University, 34469 Istanbul, Turkey
| | - Onur Ferhanoğlu
- Electronics and Communication Engineering, Istanbul Technical University, 34469 Istanbul, Turkey
| | - İnci Çilesiz
- Electronics and Communication Engineering, Istanbul Technical University, 34469 Istanbul, Turkey
| | - Murat Kazanci
- Biomedical Engineering Department, School of Engineering and Natural Sciences, Istanbul Medeniyet University, 34700 Istanbul, Turkey
| |
Collapse
|
17
|
Stokes polarimetry-based second harmonic generation microscopy for collagen and skeletal muscle fiber characterization. Lasers Med Sci 2020; 36:1161-1167. [PMID: 32945997 PMCID: PMC8282547 DOI: 10.1007/s10103-020-03144-6] [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: 05/28/2020] [Accepted: 09/10/2020] [Indexed: 12/04/2022]
Abstract
The complete polarization state of second harmonic (SH) light was measured and characterized by collagen type I and skeletal muscle fiber using a Stokes vector-based SHG microscope. The polarization states of the SH signal are analyzed in a pixel-by-pixel manner and displayed through two dimensional (2D) Stokes vector images. Various polarization parameters are reconstructed using Stokes values to quantify the polarization properties of SH light. Also, the measurements are extended for different input polarization states to investigate the molecular structure of second harmonic generation (SHG) active molecules such as collagen type I and myosin.
Collapse
|
18
|
Enhanced healing of rat calvarial defects with 3D printed calcium-deficient hydroxyapatite/collagen/bone morphogenetic protein 2 scaffolds. J Mech Behav Biomed Mater 2020; 108:103782. [DOI: 10.1016/j.jmbbm.2020.103782] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/21/2019] [Revised: 03/05/2020] [Accepted: 04/07/2020] [Indexed: 01/08/2023]
|
19
|
Monteiro L, Macedo A, Corte-Real L, Salazar F, Pacheco JJ. Treatment of snoring disorder with a non-ablactive Er:YAG laser dual mode protocol. An interventional study. J Clin Exp Dent 2020; 12:e561-e567. [PMID: 32665815 PMCID: PMC7335611 DOI: 10.4317/jced.56953] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/21/2020] [Accepted: 04/13/2020] [Indexed: 12/30/2022] Open
Abstract
Background Snoring disorder is a common problem among world population. Treatment modalities may involve surgical and non-surgical procedures. As main objective we proposed to evaluate the efficacy of non-ablative Er:YAG laser in the treatment of snoring disorder.
Material and Methods We performed an interventional study in 30 patients with snoring disorders. Three sessions were performed with Er:YAG laser 2940nm in long pulse mode (2J/cm2) and smooth mode (10-8J/cm2) in oropharynx region. We analyzed the efficacy of this protocol using questionnaires for snoring intensity, snoring related characteristics of quality of life (including the Epworth sleepness scale and OHIP-14), the satisfaction of the patients and existence of adverse effects comparing the results before and after the treatment using Wilcoxon Signed Rank test.
Results There was a 96.7% satisfaction rate after one month of treatment, and 96.4% after 6 months. A reduction of the severity of snoring from 8±1.9 before the treatment to 1.6±1.1 one month after treatment was observed (p<0.001). Decrease in mean values of Epworth sleepness scale (9.97±5.3 to 6.54±4.3) (p=0.002), and OHIP-14 score (10.9±6.2 to 5.9±5) (p<0.001) were also noted. A significant decrease in the Mallampatti and Friedman classification scores were observed (p=0.001 and p<0.001, respectively). No anesthesia was required, nor adverse effects were observed.
Conclusions Non-ablative Er:YAG laser treatment is a safe, painless, and can be an effective treatment option to reduce snoring and is well accepted by the patient. However, further controlled studies with longer follow-up are required. Key words:Er:YAG laser, snoring, sleep disorders, epworth sleepiness scale, OHIP-14.
Collapse
Affiliation(s)
- Luís Monteiro
- Oral Surgery and Oral Medicine Department, University Institute of Health Sciences, CESPU, Paredes 4585-116, Portugal.,Cancer Research Group - IINFACTS, University Institute of Health Sciences, CESPU, Paredes 4585-116, Portugal
| | - Ana Macedo
- Oral Diseases Group - IINFACTS, University Institute of Health Sciences, CESPU, Paredes 4585-116, Portugal
| | - Luis Corte-Real
- Postgraduation Program of Endodontics, University Institute of Health Sciences, CESPU, Paredes 4585-116, Portugal
| | - Filomena Salazar
- Oral Surgery and Oral Medicine Department, University Institute of Health Sciences, CESPU, Paredes 4585-116, Portugal.,Oral Diseases Group - IINFACTS, University Institute of Health Sciences, CESPU, Paredes 4585-116, Portugal
| | - José-Júlio Pacheco
- Oral Surgery and Oral Medicine Department, University Institute of Health Sciences, CESPU, Paredes 4585-116, Portugal.,Oral Diseases Group - IINFACTS, University Institute of Health Sciences, CESPU, Paredes 4585-116, Portugal
| |
Collapse
|
20
|
Kwa KAA, van Haasterecht L, Elgersma A, Breederveld RS, Groot ML, van Zuijlen PPM, Boekema BKHL. Effective enzymatic debridement of burn wounds depends on the denaturation status of collagen. Wound Repair Regen 2020; 28:666-675. [PMID: 32570295 DOI: 10.1111/wrr.12827] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/17/2020] [Revised: 04/30/2020] [Accepted: 05/05/2020] [Indexed: 12/21/2022]
Abstract
The treatment of burn wounds by enzymatic debridement using bromelain has shown promising results in our burn center. However, inadequate debridement occurred in a few cases in which the etiology of the burn was attributed to relatively low temperature burns. We hypothesized that bromelain is ineffective in burns in which collagen denaturation, which occurs approximately at 65°C, has not taken place. Our objective was to assess whether there is a relationship between the denaturation of collagen and the ability of bromelain to debride acute scald burn wounds of different temperatures. Ex vivo human skin from four different donors was cut into 1x1 cm samples, and scald burns were produced by immersion in water at temperatures of 40°C, 50°C, 60°C, 70°C, and 100°C for 20 minutes. Denaturation of collagen was assessed with histology, using hematoxylin and eosin (H&E) staining and a fluorescently labeled collagen hybridizing peptide (CHP), and with second harmonic generation (SHG) microscopy. Burned samples and one control sample (room temperature) were weighed before and after application of enzymatic debridement to assess the efficacy of enzymatic debridement. After enzymatic debridement, a weight reduction of 80% was seen in the samples heated to 70°C and 100°C, whereas the other samples showed a reduction of 20%. Unfolding of collagen, loss of basket-weave arrangement, and necrosis was seen in samples heated to 60°C or higher. Evident CHP fluorescence, indicative of collagen denaturation, was seen in samples of 60°C, 70°C and 100°C. SHG intensity, signifying intact collagen, was significantly lower in the 70°C and 100°C group (P <.05) compared to the lower temperatures. In conclusion, denaturation of collagen in skin samples occurred between 60°C and 70°C and strongly correlated with the efficacy of enzymatic debridement. Therefore, enzymatic debridement with the use of bromelain is ineffective in scald burns lower than 60°C.
Collapse
Affiliation(s)
- Kelly A A Kwa
- Burn Center, Red Cross Hospital, Beverwijk, The Netherlands.,Department of Traumasurgery, Leiden University Medical Center, Leiden, The Netherlands
| | - Ludo van Haasterecht
- LaserLaB Amsterdam, Department of Physics and Astronomy, Faculty of Sciences, Vrije Universiteit Amsterdam, Amsterdam, The Netherlands.,Amsterdam UMC Location VUmc, Department of Plastic, Reconstructive and Hand Surgery, Amsterdam Movement Sciences, Amsterdam, The Netherlands
| | - Anouk Elgersma
- Preclinical Research, Association of Dutch Burn Centers, Beverwijk, The Netherlands
| | - Roelf S Breederveld
- Burn Center, Red Cross Hospital, Beverwijk, The Netherlands.,Department of Traumasurgery, Leiden University Medical Center, Leiden, The Netherlands
| | - Marie Louise Groot
- LaserLaB Amsterdam, Department of Physics and Astronomy, Faculty of Sciences, Vrije Universiteit Amsterdam, Amsterdam, The Netherlands
| | - Paul P M van Zuijlen
- Burn Center, Red Cross Hospital, Beverwijk, The Netherlands.,Amsterdam UMC Location VUmc, Department of Plastic, Reconstructive and Hand Surgery, Amsterdam Movement Sciences, Amsterdam, The Netherlands
| | - Bouke K H L Boekema
- Preclinical Research, Association of Dutch Burn Centers, Beverwijk, The Netherlands
| |
Collapse
|
21
|
Stani C, Vaccari L, Mitri E, Birarda G. FTIR investigation of the secondary structure of type I collagen: New insight into the amide III band. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2020; 229:118006. [PMID: 31927236 DOI: 10.1016/j.saa.2019.118006] [Citation(s) in RCA: 97] [Impact Index Per Article: 24.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/02/2019] [Revised: 12/02/2019] [Accepted: 12/27/2019] [Indexed: 06/10/2023]
Abstract
This work presents a thorough study on the Amide III band in fibrous proteins using Fourier Transformed Infrared Spectroscopy (FTIR). Type I collagen was chosen as a model for this family of proteins, not only because of its important role in mammalian tissues, but also for its involvement in several pathologies. In order to disclose the conformational information contained in the collagen bands, the spectral characteristics of Amide III of type I collagen were related to the ones of Amide I band, performing experiments of thermal denaturation of the protein in acidic solution. Data acquired allowed to observe the protein unfolding and retrieve information about its structural arrangements during the thermal cycle. Taking as guideline the well-known behaviour of the Amide I band, we correlated the structural changes deducible from Amide I analysis with the ones detectable for Amide III band, by exploiting three spectral analysis techniques, namely 2D-correlation analysis, second derivative analysis, and peak-fitting. This approach enabled us to jointly support the obtained results and finally to assign the components of the Amide III of a typical fibrous protein, such as type I collagen, to its characteristic secondary structure.
Collapse
Affiliation(s)
- Chiaramaria Stani
- Elettra - Sincrotrone Trieste, Strada Statale 14 - km 163,5 in AREA Science Park, 34149 Basovizza, Trieste, Italy
| | - Lisa Vaccari
- Elettra - Sincrotrone Trieste, Strada Statale 14 - km 163,5 in AREA Science Park, 34149 Basovizza, Trieste, Italy
| | - Elisa Mitri
- Elettra - Sincrotrone Trieste, Strada Statale 14 - km 163,5 in AREA Science Park, 34149 Basovizza, Trieste, Italy
| | - Giovanni Birarda
- Elettra - Sincrotrone Trieste, Strada Statale 14 - km 163,5 in AREA Science Park, 34149 Basovizza, Trieste, Italy.
| |
Collapse
|
22
|
Accelerated endothelialization and suppressed thrombus formation of acellular vascular grafts by modifying with neointima-inducing peptide: A time-dependent analysis of graft patency in rat-abdominal transplantation model. Colloids Surf B Biointerfaces 2019; 181:806-813. [DOI: 10.1016/j.colsurfb.2019.06.037] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/12/2019] [Revised: 06/16/2019] [Accepted: 06/17/2019] [Indexed: 01/07/2023]
|
23
|
Dudenkova VV, Shirmanova MV, Lukina MM, Feldshtein FI, Virkin A, Zagainova EV. Examination of Collagen Structure and State by the Second Harmonic Generation Microscopy. BIOCHEMISTRY (MOSCOW) 2019; 84:S89-S107. [DOI: 10.1134/s0006297919140062] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/15/2023]
|
24
|
Yu D, Brown EB, Huxlin KR, Knox WH. Tissue effects of intra-tissue refractive index shaping (IRIS): insights from two-photon autofluorescence and second harmonic generation microscopy. BIOMEDICAL OPTICS EXPRESS 2019; 10:855-867. [PMID: 30800519 PMCID: PMC6377903 DOI: 10.1364/boe.10.000855] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/30/2018] [Revised: 12/29/2018] [Accepted: 01/02/2019] [Indexed: 05/05/2023]
Abstract
Intra-tissue refractive index shaping (IRIS) is a novel, non-ablative form of vision correction by which femtosecond laser pulses are tightly focused into ocular tissues to induce localized refractive index (RI) change via nonlinear absorption. Here, we examined the effects of Blue-IRIS on corneal microstructure to gain insights into underlying mechanisms. Three-layer grating patterns were inscribed with IRIS ~180 µm below the epithelial surface of ex vivo rabbit globes using a 400 nm femtosecond laser. Keeping laser power constant at 82 mW in the focal volume, multiple patterns were written at different scan speeds. The largest RI change induced in this study was + 0.011 at 20 mm/s. After measuring the phase change profile of each inscribed pattern, two-photon excited autofluorescence (TPEF) and second harmonic generation (SHG) microscopy were used to quantify changes in stromal structure. While TPEF increased significantly with induced RI change, there was a noticeable suppression of SHG signal in IRIS treated regions. We posit that enhancement of TPEF was due to the formation of new fluorophores, while decreases in SHG were most likely due to degradation of collagen triple helices. All in all, the changes observed suggest that IRIS works by inducing a localized, photochemical change in collagen structure.
Collapse
Affiliation(s)
- Dan Yu
- The Institute of Optics, University of Rochester, Rochester, NY 14627, USA
- Materials Science Program, University of Rochester, Rochester, NY 14627, USA
| | - Edward B. Brown
- Department of Biomedical Engineering, University of Rochester, Rochester, NY 14627, USA
| | - Krystel R. Huxlin
- The Institute of Optics, University of Rochester, Rochester, NY 14627, USA
- Flaum Eye Institute, University of Rochester, Rochester, NY 14627, USA
- Center for Visual Science, University of Rochester, Rochester, NY 14627, USA
| | - Wayne H. Knox
- The Institute of Optics, University of Rochester, Rochester, NY 14627, USA
- Materials Science Program, University of Rochester, Rochester, NY 14627, USA
- Center for Visual Science, University of Rochester, Rochester, NY 14627, USA
| |
Collapse
|
25
|
Lin AH, Zitnay JL, Li Y, Yu SM, Weiss JA. Microplate assay for denatured collagen using collagen hybridizing peptides. J Orthop Res 2019; 37:431-438. [PMID: 30474872 PMCID: PMC6576259 DOI: 10.1002/jor.24185] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/17/2018] [Accepted: 11/13/2018] [Indexed: 02/04/2023]
Abstract
The purpose of this study was to develop a microplate assay for quantifying denatured collagen by measuring the fluorescence of carboxyfluorescein bound collagen hybridizing peptides (F-CHP). We have shown that F-CHP binds selectively with denatured collagen, and that mechanical overload of tendon fascicles causes collagen denaturation. Proteinase K was used to homogenize tissue samples after F-CHP staining, allowing fluorescence measurement using a microplate reader. We compared our new assay to our previous image analysis method and the trypsin-hydroxyproline assay, which is the only other available method to directly quantify denatured collagen. Relative quantification of denatured collagen was performed in rat tail tendon fascicles subjected to incremental tensile overload, and normal and ostoeoarthritic guinea pig cartilage. In addition, the absolute amount of denatured collagen was determined in rat tail tendon by correlating F-CHP fluorescence with percent denatured collagen as determined by the trypsin-hydroxyproline assay. Rat tail tendon fascicles stretched to low strains (<7.5%) exhibited minimal denatured collagen, but values rapidly increased at medium strains (7.5-10.5%) and plateaued at high strains (≥12%). Osteoarthritic cartilage had higher F-CHP fluorescence than healthy cartilage. Both of these outcomes are consistent with previous studies. With the calibration curve, the microplate assay was able to absolutely quantify denatured collagen in mechanically damaged rat tail tendon fascicles as reliably as the trypsin-hydroxyproline assay. Further, we achieved these results more efficiently than current methods in a rapid, high-throughput manner, with multiple types of collagenous tissue while maintaining accuracy. © 2018 Orthopaedic Research Society. Published by Wiley Periodicals, Inc. J Orthop Res 37:431-438, 2019.
Collapse
Affiliation(s)
- Allen H. Lin
- Department of Bioengineering, University of Utah,Scientific Computing and Imaging Institute, University of Utah
| | - Jared L. Zitnay
- Department of Bioengineering, University of Utah,Scientific Computing and Imaging Institute, University of Utah
| | - Yang Li
- Department of Bioengineering, University of Utah
| | - S. Michael Yu
- Department of Bioengineering, University of Utah,Department of Pharmaceutics and Pharmaceutical Chemistry, University of Utah
| | - Jeffrey A. Weiss
- Department of Bioengineering, University of Utah,Scientific Computing and Imaging Institute, University of Utah,Department of Orthopaedics, University of Utah
| |
Collapse
|
26
|
Lukina MM, Dudenkova VV, Shimolina LE, Snopova LB, Zagaynova EV, Shirmanova MV. In vivo metabolic and SHG imaging for monitoring of tumor response to chemotherapy. Cytometry A 2018; 95:47-55. [PMID: 30329217 DOI: 10.1002/cyto.a.23607] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/31/2018] [Revised: 08/15/2018] [Accepted: 08/20/2018] [Indexed: 12/12/2022]
Abstract
Although chemotherapy remains one of the main types of treatment for cancer, treatment failure is a frequent occurrence, emphasizing the need for new approaches to the early assessment of tumor response. The aim of this study was to search for indicators based on optical imaging of cellular metabolism and of collagen in tumors in vivo that enable evaluation of their response to chemotherapy. The study was performed on a mouse colorectal cancer model with the use of cisplatin, paclitaxel, and irinotecan. The metabolic activity of the tumor cells was assessed using fluorescence lifetime imaging of the metabolic cofactor reduced nicotinamide adenine dinucleotide (phosphate), NAD(P)H. Second harmonic generation (SHG) imaging was used to analyze the extent and properties of collagen within the tumors. We detected an early decrease in the free/bound NAD(P)H ratio in all treated tumors, indicating a shift toward a more oxidative metabolism. Monitoring of collagen showed an early increase in the amount of collagen followed by an increase in the extent of its orientation in tumors treated with cisplatin and paclitaxel, and decrease in collagen content in the case of irinotecan. Our study suggests that changes in cellular metabolism and fibrotic stroma organization precede morphological alterations and tumor size reduction, and that this indicates that NAD(P)H and collagen can be considered as intrinsic indicators of the response to treatment. This is the first time that these parameters have been investigated in tumors in vivo in the course of chemotherapy with drugs having different mechanisms of action. © 2018 International Society for Advancement of Cytometry.
Collapse
Affiliation(s)
- Maria M Lukina
- Institute of Biomedical Technologies, Privolzhskiy Research Medical University, Nizhny Novgorod, Russia.,Institute of Biology and Biomedicine, Lobachevsky State University of Nizhny Novgorod, Nizhny Novgorod, Russia
| | - Varvara V Dudenkova
- Institute of Biomedical Technologies, Privolzhskiy Research Medical University, Nizhny Novgorod, Russia.,Institute of Biology and Biomedicine, Lobachevsky State University of Nizhny Novgorod, Nizhny Novgorod, Russia
| | - Lyubov' E Shimolina
- Institute of Biomedical Technologies, Privolzhskiy Research Medical University, Nizhny Novgorod, Russia.,Institute of Biology and Biomedicine, Lobachevsky State University of Nizhny Novgorod, Nizhny Novgorod, Russia
| | - Ludmila B Snopova
- Institute of Biomedical Technologies, Privolzhskiy Research Medical University, Nizhny Novgorod, Russia
| | - Elena V Zagaynova
- Institute of Biomedical Technologies, Privolzhskiy Research Medical University, Nizhny Novgorod, Russia
| | - Marina V Shirmanova
- Institute of Biomedical Technologies, Privolzhskiy Research Medical University, Nizhny Novgorod, Russia
| |
Collapse
|
27
|
Purslow PP. Contribution of collagen and connective tissue to cooked meat toughness; some paradigms reviewed. Meat Sci 2018; 144:127-134. [DOI: 10.1016/j.meatsci.2018.03.026] [Citation(s) in RCA: 65] [Impact Index Per Article: 10.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/17/2018] [Revised: 03/01/2018] [Accepted: 03/28/2018] [Indexed: 11/26/2022]
|
28
|
Zhang AJ, Jiang T, Li Q, Jin PS, Tan Q. Experimental research on ADSCs-NCSS in wound repair. Exp Ther Med 2018; 16:4429-4436. [PMID: 30542393 PMCID: PMC6257557 DOI: 10.3892/etm.2018.6756] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/17/2018] [Accepted: 08/01/2018] [Indexed: 01/31/2023] Open
Abstract
New collagen sponge scaffold (NCSS) combined with adipose-derived stem cells (ADSCs) in the repair of full-thickness skin wound in nude mice was investigated. Human ADSCs were extracted via enzyme digestion; NCSS materials were prepared using modified method; the tissue-engineered skin substitute was constructed using ADSCs combined with NCSS. Two 10 mm2 full-thickness skin wounds were designed on the back of 24 female nude mice, respectively. Mice were divided into 4 groups in the experiment: ADSCs-NCSS (group A), simple NCSS (group B), simple ADSCs (group C) and blank control (group D). The wound healing rates were observed at 3, 7, 10 and 14 days after operation, and specimens were taken at 1 and 2 weeks for histological detection and immunohistochemical cluster of differentiation 31 (CD31) vascular density detection, respectively. At 3 and 7 days after construction of new tissue-engineered skin substitute, the infiltration of ADSCs could be seen within NCSS. The wound healing rates at 7, 10 and 14 days after operation in group A were (77.13±1.25%), (89.90±1.08%) and (96.08±0.6%), respectively, which were significantly higher than those in groups B-D; the differences were statistically significant (p<0.05). The detection of regenerated wound tissue thickness at 1 and 2 weeks after operation and CD31 vascular density at 1 week after operation showed that the vascular density in the wound in group A was significantly higher than those in other groups; the differences were statistically significant (p<0.05). After the transplantation of tissue-engineered skin constructed by human ADSCs combined with NCSS, the quality of wound healing in nude mice can be significantly improved, and the wound repair can be promoted.
Collapse
Affiliation(s)
- Ai-Jun Zhang
- Department of Burns and Plastic Surgery, The Drum Tower Clinical College of Nanjing Medical University, Nanjing, Jiangsu 210008, P.R. China
| | - Tao Jiang
- Department of Burn and Plastic Surgery, Xuzhou Central Hospital, Xuzhou, Jiangsu 221000, P.R. China
| | - Qiang Li
- Department of Plastic Surgery, Affiliated Hospital of Xuzhou Medical University, Xuzhou, Jiangsu 221005, P.R. China
| | - Pei-Sheng Jin
- Department of Plastic Surgery, Affiliated Hospital of Xuzhou Medical University, Xuzhou, Jiangsu 221005, P.R. China
| | - Qian Tan
- Department of Burns and Plastic Surgery, The Drum Tower Clinical College of Nanjing Medical University, Nanjing, Jiangsu 210008, P.R. China
| |
Collapse
|
29
|
Latorre ME, Velázquez DE, Purslow PP. Differences in the energetics of collagen denaturation in connective tissue from two muscles. Int J Biol Macromol 2018; 113:1294-1301. [DOI: 10.1016/j.ijbiomac.2018.02.132] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/02/2017] [Revised: 02/19/2018] [Accepted: 02/21/2018] [Indexed: 10/18/2022]
|
30
|
Dominguez-Hernandez E, Salaseviciene A, Ertbjerg P. Low-temperature long-time cooking of meat: Eating quality and underlying mechanisms. Meat Sci 2018; 143:104-113. [PMID: 29730528 DOI: 10.1016/j.meatsci.2018.04.032] [Citation(s) in RCA: 125] [Impact Index Per Article: 20.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/08/2017] [Revised: 04/25/2018] [Accepted: 04/26/2018] [Indexed: 10/17/2022]
Abstract
Heat treatment of meat at temperatures between 50 and 65 °C, for extended periods of time, is known as low-temperature long-time (LTLT) cooking. This cooking method produces meat that has increased tenderness and better appearance than when cooked at higher temperatures. Public concerns regarding this method have focused on the ability to design heat treatments that can reach microbiological safety. The heat treatment induces modification of the meat structure and its constituents, which can explain the desirable eating quality traits obtained. Denaturation, aggregation, and degradation of myofibrillar, sarcoplasmic and connective tissue proteins occur depending on the combination of time and temperature during the heat treatment. The protein changes, especially in relation to collagen denaturation, along with proteolytic activity, have often been regarded to be the main contributors to the increased meat tenderness. The mechanisms involved and the possible contribution of other factors are reviewed and discussed.
Collapse
Affiliation(s)
| | | | - Per Ertbjerg
- Department of Food and Nutrition, University of Helsinki, 00014 Helsinki, Finland.
| |
Collapse
|
31
|
Lee J, Kim G. Calcium-Deficient Hydroxyapatite/Collagen/Platelet-Rich Plasma Scaffold with Controlled Release Function for Hard Tissue Regeneration. ACS Biomater Sci Eng 2017; 4:278-289. [DOI: 10.1021/acsbiomaterials.7b00640] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Affiliation(s)
- JiUn Lee
- Department of Biomechatronic Engineering,
College of Biotechnology and Bioengineering, Sungkyunkwan University (SKKU), Suwon, Korea
| | - GeunHyung Kim
- Department of Biomechatronic Engineering,
College of Biotechnology and Bioengineering, Sungkyunkwan University (SKKU), Suwon, Korea
| |
Collapse
|
32
|
Sensory characterization, physico-chemical properties and somatic yields of five emerging fish species. Food Res Int 2017; 100:396-406. [DOI: 10.1016/j.foodres.2017.07.023] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/25/2017] [Revised: 07/05/2017] [Accepted: 07/12/2017] [Indexed: 11/18/2022]
|
33
|
Okoro C, Toussaint KC. Second-harmonic patterned polarization-analyzed reflection confocal microscope. JOURNAL OF BIOMEDICAL OPTICS 2017; 22:1-8. [PMID: 28836417 DOI: 10.1117/1.jbo.22.8.086007] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/30/2017] [Accepted: 07/31/2017] [Indexed: 05/02/2023]
Abstract
We introduce the second-harmonic patterned polarization-analyzed reflection confocal (SPPARC) microscope-a multimodal imaging platform that integrates Mueller matrix polarimetry with reflection confocal and second-harmonic generation (SHG) microscopy. SPPARC microscopy provides label-free three-dimensional (3-D), SHG-patterned confocal images that lend themselves to spatially dependent, linear polarimetric analysis for extraction of rich polarization information based on the Mueller calculus. To demonstrate its capabilities, we use SPPARC microscopy to analyze both porcine tendon and ligament samples and find differences in both circular degree-of-polarization and depolarization parameters. Moreover, using the collagen-generated SHG signal as an endogenous counterstain, we show that the technique can be used to provide 3-D polarimetric information of the surrounding extrafibrillar matrix plus cells or EFMC region. The unique characteristics of SPPARC microscopy holds strong potential for it to more accurately and quantitatively describe microstructural changes in collagen-rich samples in three spatial dimensions.
Collapse
Affiliation(s)
- Chukwuemeka Okoro
- University of Illinois at Urbana-Champaign, PROBE Lab, Department of Electrical and Computer Enginee, United States
| | - Kimani C Toussaint
- University of Illinois at Urbana-Champaign, PROBE Lab, Department of Mechanical Science and Engineer, United States
- University of Illinois at Urbana-Champaign, PROBE Lab, Affiliate in the Department of Electrical and, United States
| |
Collapse
|
34
|
Jung S, Lademann J, Darvin ME, Richter C, Pedersen CB, Richter H, Schanzer S, Kottner J, Blume-Peytavi U, Røpke MA. In vivo characterization of structural changes after topical application of glucocorticoids in healthy human skin. JOURNAL OF BIOMEDICAL OPTICS 2017; 22:76018. [PMID: 28753693 DOI: 10.1117/1.jbo.22.7.076018] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/10/2017] [Accepted: 06/28/2017] [Indexed: 05/16/2023]
Abstract
Topical glucocorticoids (GC) are known to induce changes in human skin with the potential to develop skin atrophy. Here, atrophogenic effects and subsequent structural changes in the skin after topical application of GC were investigated in vivo. Sixteen healthy volunteers were topically treated daily on the forearms with clobetasol propionate, betamethasone dipropionate, and the petrolatum vehicle for 4 weeks. All treated skin areas and a nontreated control area were examined by ultrasound, optical coherence tomography, confocal laser scanning microscopy, multiphoton tomography (MPT), and resonance Raman spectroscopy at baseline 1 day after last application and 1 week after last application. Investigated parameters included stratum corneum thickness, epidermal, and full skin thickness, keratinocyte size and density, keratinocyte nucleus-to-cytoplasm ratio, skin surface classification, relative collagen and elastin signal intensity, second-harmonic generation-to-autofluorescence aging index of dermis (SAAID), and the antioxidant status of the skin. A reduction in epidermal and dermal skin thickness was observed in GC treated as well as in vehicle-treated and untreated skin areas on the volar forearm. MPT analysis showed an increased epidermal cell density and reduced cell size and nucleus-to-cytoplasm ratio and a significant increase of SAAID after GC treatment indicating a restructuring or compression of collagen fibers clinically being observed as atrophic changes.
Collapse
Affiliation(s)
- Sora Jung
- Charité-Universitätsmedizin Berlin, Center of Experimental and Applied Cutaneous Physiology, Department of Dermatology, Venerology, and Allergology, Berlin, Germany
| | - Jürgen Lademann
- Charité-Universitätsmedizin Berlin, Center of Experimental and Applied Cutaneous Physiology, Department of Dermatology, Venerology, and Allergology, Berlin, Germany
| | - Maxim E Darvin
- Charité-Universitätsmedizin Berlin, Center of Experimental and Applied Cutaneous Physiology, Department of Dermatology, Venerology, and Allergology, Berlin, Germany
| | - Claudia Richter
- Charité-Universitätsmedizin, Department of Dermatology and Allergy, Clinical Research Center for Hair and Skin Science, Berlin, Germany
| | | | - Heike Richter
- Charité-Universitätsmedizin Berlin, Center of Experimental and Applied Cutaneous Physiology, Department of Dermatology, Venerology, and Allergology, Berlin, Germany
| | - Sabine Schanzer
- Charité-Universitätsmedizin Berlin, Center of Experimental and Applied Cutaneous Physiology, Department of Dermatology, Venerology, and Allergology, Berlin, Germany
| | - Jan Kottner
- Charité-Universitätsmedizin, Department of Dermatology and Allergy, Clinical Research Center for Hair and Skin Science, Berlin, Germany
| | - Ulrike Blume-Peytavi
- Charité-Universitätsmedizin, Department of Dermatology and Allergy, Clinical Research Center for Hair and Skin Science, Berlin, Germany
| | | |
Collapse
|
35
|
Fields M, Spencer N, Dudhia J, McMillan PF. Structural changes in cartilage and collagen studied by high temperature Raman spectroscopy. Biopolymers 2017; 107. [DOI: 10.1002/bip.23017] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/16/2016] [Revised: 02/16/2017] [Accepted: 02/16/2017] [Indexed: 02/02/2023]
Affiliation(s)
- Mark Fields
- Department of Chemistry; University College London; 20 Gordon Street London WC1H 0AJ United Kingdom
| | - Nicholas Spencer
- WestCHEM, School of Chemistry, Joseph Black Building; University of Glasgow; Glasgow G12 9QQ United Kingdom
| | - Jayesh Dudhia
- Department of Clinical Sciences and Services; The Royal Veterinary College; Hawkshead Lane, North Mymms, Hatfield Herts AL9 7TA United Kingdom
| | - Paul F. McMillan
- Department of Chemistry; University College London; 20 Gordon Street London WC1H 0AJ United Kingdom
| |
Collapse
|
36
|
Santos MOD, Latrive A, De Castro PAA, De Rossi W, Zorn TMT, Samad RE, Freitas AZ, Cesar CL, Junior NDV, Zezell DM. Multimodal evaluation of ultra-short laser pulses treatment for skin burn injuries. BIOMEDICAL OPTICS EXPRESS 2017; 8:1575-1588. [PMID: 28663850 PMCID: PMC5480565 DOI: 10.1364/boe.8.001575] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/04/2016] [Revised: 01/26/2017] [Accepted: 02/06/2017] [Indexed: 05/13/2023]
Abstract
Thousands of people die every year from burn injuries. The aim of this study is to evaluate the feasibility of high intensity femtosecond lasers as an auxiliary treatment of skin burns. We used an in vivo animal model and monitored the healing process using 4 different imaging modalities: histology, Optical Coherence Tomography (OCT), Second Harmonic Generation (SHG), and Fourier Transform Infrared (FTIR) spectroscopy. 3 dorsal areas of 20 anesthetized Wistar rats were burned by water vapor exposure and subsequently treated either by classical surgical debridement, by laser ablation, or left without treatment. Skin burn tissues were non-invasively characterized by OCT images and biopsied for further histopathology analysis, SHG imaging and FTIR spectroscopy at 3, 5, 7 and 14 days after burn. The laser protocol was found as efficient as the classical treatment for promoting the healing process. The study concludes to the validation of femtosecond ultra-short pulses laser treatment for skinburns, with the advantage of minimizing operatory trauma.
Collapse
Affiliation(s)
- Moises Oliveira Dos Santos
- Universidade do Estado do Amazonas, Escola Superior de Tecnologia, Manaus, AM,
Brazil
- Instituto de Pesquisas Energeticas e Nucleares, Centro de Lasers e Aplicacoes, Sao Paulo, SP,
Brazil
| | - Anne Latrive
- Instituto de Pesquisas Energeticas e Nucleares, Centro de Lasers e Aplicacoes, Sao Paulo, SP,
Brazil
| | | | - Wagner De Rossi
- Instituto de Pesquisas Energeticas e Nucleares, Centro de Lasers e Aplicacoes, Sao Paulo, SP,
Brazil
| | | | - Ricardo Elgul Samad
- Instituto de Pesquisas Energeticas e Nucleares, Centro de Lasers e Aplicacoes, Sao Paulo, SP,
Brazil
| | - Anderson Zanardi Freitas
- Instituto de Pesquisas Energeticas e Nucleares, Centro de Lasers e Aplicacoes, Sao Paulo, SP,
Brazil
| | - Carlos Lenz Cesar
- Universidade Estadual de Campinas, Instituto de Fisica Gleb Wataghin, Campinas, SP,
Brazil
- Universidade Federal do Ceara, Departamento de Fisica, Fortaleza, CE,
Brazil
| | - Nilson Dias Vieira Junior
- Instituto de Pesquisas Energeticas e Nucleares, Centro de Lasers e Aplicacoes, Sao Paulo, SP,
Brazil
| | - Denise Maria Zezell
- Instituto de Pesquisas Energeticas e Nucleares, Centro de Lasers e Aplicacoes, Sao Paulo, SP,
Brazil
| |
Collapse
|
37
|
Terrer E, Panayotov IV, Slimani A, Tardivo D, Gillet D, Levallois B, Fejerskov O, Gergely C, Cuisinier FJG, Tassery H, Cloitre T. Laboratory Studies of Nonlinear Optical Signals for Caries Detection. J Dent Res 2016; 95:574-9. [PMID: 26826107 DOI: 10.1177/0022034516629400] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022] Open
Abstract
Multiphoton confocal microscopy and nonlinear spectroscopy are used to investigate the caries process in dentin. Although dentin is a major calcified tissue of the teeth, its organic phase comprises type I collagen fibers. Caries drive dentin demineralization and collagen denaturation. Multiphoton microscopy is a powerful imaging technique: the biological materials are transparent to infrared frequencies and can be excited to penetration depths inaccessible to 1-photon confocal microscopy. The laser excitation greatly reduces photodamage to the sole focal region, and the signal-to-noise ratio is improved significantly. The method has been used to follow pathologic processes involving collagen fibrosis or collagen destruction based on their 2-photon excited fluorescence (2PEF) emission and second harmonic generation (SHG). Combining multiphoton imaging with nonlinear spectroscopy, we demonstrate that both 2PEF and SHG intensity of human dentin are strongly modified during the tooth caries process, and we show that the ratio between SHG and 2PEF signals is a reliable parameter to follow dental caries. The ratio of the SHG/2PEF signals measured by nonlinear optical spectroscopy provides valuable information on the caries process, specifically on the degradation of the organic matrix of dentin. The goal is to bring these nonlinear optical signals to clinical application for caries diagnosis.
Collapse
Affiliation(s)
- E Terrer
- Laboratoire Bio ingénierie et Nanosciences, Université de Montpellier, Montpellier, France Université d'Aix-Marseille, Marseille, France
| | - I V Panayotov
- Laboratoire Bio ingénierie et Nanosciences, Université de Montpellier, Montpellier, France
| | - A Slimani
- Laboratoire Bio ingénierie et Nanosciences, Université de Montpellier, Montpellier, France
| | - D Tardivo
- Laboratoire Anthropologie bio-culturelle, droit, éthique et santé, UMR 7268 CNRS-Université d'Aix-Marseille, Marseille, France
| | - D Gillet
- Laboratoire Bio ingénierie et Nanosciences, Université de Montpellier, Montpellier, France
| | - B Levallois
- Laboratoire Bio ingénierie et Nanosciences, Université de Montpellier, Montpellier, France
| | - O Fejerskov
- Department of Biomedicine-Anatomy Health, Aarhus University, Aarhus, Denmark
| | - C Gergely
- Laboratoire Charles Coulomb, UMR 5221 CNRS-Université de Montpellier, Montpellier, France
| | - F J G Cuisinier
- Laboratoire Bio ingénierie et Nanosciences, Université de Montpellier, Montpellier, France
| | - H Tassery
- Laboratoire Bio ingénierie et Nanosciences, Université de Montpellier, Montpellier, France Université d'Aix-Marseille, Marseille, France
| | - T Cloitre
- Laboratoire Charles Coulomb, UMR 5221 CNRS-Université de Montpellier, Montpellier, France
| |
Collapse
|
38
|
Wu S, Huang Y, Li H, Wang Y, Zhang X. Quantitative analysis on collagen of dermatofibrosarcoma protuberans skin by second harmonic generation microscopy. SCANNING 2015; 37:1-5. [PMID: 25369371 DOI: 10.1002/sca.21172] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/01/2014] [Revised: 09/24/2014] [Accepted: 10/06/2014] [Indexed: 06/04/2023]
Abstract
Dermatofibrosarcoma protuberans (DFSP) is a skin cancer usually mistaken as other benign tumors. Abnormal DFSP resection results in tumor recurrence. Quantitative characterization of collagen alteration on the skin tumor is essential for developing a diagnostic technique. In this study, second harmonic generation (SHG) microscopy was performed to obtain images of the human DFSP skin and normal skin. Subsequently, structure and texture analysis methods were applied to determine the differences in skin texture characteristics between the two skin types, and the link between collagen alteration and tumor was established. Results suggest that combining SHG microscopy and texture analysis methods is a feasible and effective method to describe the characteristics of skin tumor like DFSP.
Collapse
Affiliation(s)
- Shulian Wu
- Key Lab of OptoElectronic Science and Technology for Medicine, Ministry of Education, Fujian Provincial Key Lab of Photonic Technology, College of Photonic and Electronic Engineering, Fujian Normal University, Fuzhou, Fujian, China
| | | | | | | | | |
Collapse
|
39
|
Manickavasagam A, Hirvonen LM, Melita LN, Chong EZ, Cook RJ, Bozec L, Festy F. Multimodal optical characterisation of collagen photodegradation by femtosecond infrared laser ablation. Analyst 2014; 139:6135-43. [PMID: 25318007 DOI: 10.1039/c4an01523a] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Collagen is a structural component of the human body, as a connective tissue it can become altered as a result of pathophysiological conditions. Although the collagen degradation mechanism is not fully understood, it plays an important role in ageing, disease progression and applications in therapeutic laser treatments. To fully understand the mechanism of collagen alteration, in our study photo-disruptive effects were induced in collagen I matrix by point-irradiation with a femtosecond Ti-sapphire laser under controlled laser ablation settings. This was followed by multi-modal imaging of the irradiated and surrounding areas to analyse the degradation mechanism. Our multi-modal methodology was based on second harmonic generation (SHG), scanning electron microscope (SEM), autofluorescence (AF) average intensities and the average fluorescence lifetime. This allowed us to quantitatively characterise the degraded area into four distinct zones: (1) depolymerised zone in the laser focal spot as indicated by the loss of SHG signal, (2) enhanced crosslinking zone in the inner boundary of the laser induced cavity as represented by the high fluorescence ring, (3) reduced crosslinking zone formed the outer boundary of the cavity as marked by the increased SHG signal and (4) native collagen. These identified distinct zones were in good agreement with the expected photochemical changes shown using Raman spectroscopy. In addition, imaging using polarisation-resolved SHG (p-SHG) revealed both a high degree of fibre re-orientation and a SHG change in tensor ratios around the irradiation spot. Our multi-modal optical imaging approach can provide a new methodology for defining distinct zones that can be used in a clinical setting to determine suitable thresholds for applying safe laser treatments without affecting the surrounding tissues. Furthermore this technique can be extended to address challenges observed in collagen based tissue engineering and used as a minimally invasive diagnostic tool to characterise diseased and non-diseased collagen rich tissues.
Collapse
Affiliation(s)
- A Manickavasagam
- Biomaterial, Biomimetics & Biophotonics Division, King's College London Dental Institute, London, UK.
| | | | | | | | | | | | | |
Collapse
|
40
|
Clinical nonlinear laser imaging of human skin: a review. BIOMED RESEARCH INTERNATIONAL 2014; 2014:903589. [PMID: 25250337 PMCID: PMC4163368 DOI: 10.1155/2014/903589] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 04/24/2014] [Accepted: 07/11/2014] [Indexed: 11/23/2022]
Abstract
Nonlinear optical microscopy has the potential of being used in vivo as a noninvasive imaging modality for both epidermal and dermal imaging. This paper reviews the capabilities of nonlinear microscopy as a noninvasive high-resolution tool for clinical skin inspection. In particular, we show that two-photon fluorescence microscopy can be used as a diagnostic tool for characterizing epidermal layers by means of a morphological examination. Additional functional information on the metabolic state of cells can be provided by measuring the fluorescence decay of NADH. This approach allows differentiating epidermal layers having different structural and cytological features and has the potential of diagnosing pathologies in a very early stage. Regarding therapy follow-up, we demonstrate that nonlinear microscopy could be successfully used for monitoring the effect of a treatment. In particular, combined two-photon fluorescence and second-harmonic generation microscopy were used in vivo for monitoring collagen remodeling after microablative fractional laser resurfacing and for quantitatively monitoring psoriasis on the basis of the morphology of epidermal cells and dermal papillae. We believe that the described microscopic modalities could find in the near future a stable place in a clinical dermatological setting for quantitative diagnostic purposes and as a monitoring method for various treatments.
Collapse
|
41
|
Mazumder N, Hu CW, Qiu J, Foreman MR, Romero CM, Török P, Kao FJ. Revealing molecular structure and orientation with Stokes vector resolved second harmonic generation microscopy. Methods 2014; 66:237-45. [DOI: 10.1016/j.ymeth.2013.07.019] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/17/2013] [Revised: 07/05/2013] [Accepted: 07/12/2013] [Indexed: 10/26/2022] Open
|
42
|
Camp CH, Lee YJ, Heddleston JM, Hartshorn CM, Hight Walker AR, Rich JN, Lathia JD, Cicerone MT. High-Speed Coherent Raman Fingerprint Imaging of Biological Tissues. NATURE PHOTONICS 2014; 8:627-634. [PMID: 25621002 PMCID: PMC4304702 DOI: 10.1038/nphoton.2014.145] [Citation(s) in RCA: 211] [Impact Index Per Article: 21.1] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/08/2023]
Abstract
An imaging platform based on broadband coherent anti-Stokes Raman scattering (BCARS) has been developed which provides an advantageous combination of speed, sensitivity and spectral breadth. The system utilizes a configuration of laser sources that probes the entire biologically-relevant Raman window (500 cm-1 to 3500 cm-1) with high resolution (< 10 cm-1). It strongly and efficiently stimulates Raman transitions within the typically weak "fingerprint" region using intrapulse 3-colour excitation, and utilizes the nonresonant background (NRB) to heterodyne amplify weak Raman signals. We demonstrate high-speed chemical imaging in two- and three-dimensional views of healthy murine liver and pancreas tissues and interfaces between xenograft brain tumours and the surrounding healthy brain matter.
Collapse
Affiliation(s)
- Charles H. Camp
- Biosystems and Biomaterials Division, National Institute of Standards and Technology, 100 Bureau Dr, Gaithersburg, MD 20899, USA
| | - Young Jong Lee
- Biosystems and Biomaterials Division, National Institute of Standards and Technology, 100 Bureau Dr, Gaithersburg, MD 20899, USA
| | - John M. Heddleston
- Semiconductor and Dimensional Metrology Division, National Institute of Standards and Technology, 100 Bureau Dr, Gaithersburg, MD 20899, USA
| | - Christopher M. Hartshorn
- Biosystems and Biomaterials Division, National Institute of Standards and Technology, 100 Bureau Dr, Gaithersburg, MD 20899, USA
| | - Angela R. Hight Walker
- Semiconductor and Dimensional Metrology Division, National Institute of Standards and Technology, 100 Bureau Dr, Gaithersburg, MD 20899, USA
| | - Jeremy N. Rich
- Department of Stem Cell Biology and Regenerative Medicine, Cleveland Clinic, 9500 Euclid Ave, Cleveland, OH 44195, USA
| | - Justin D. Lathia
- Department of Cellular and Molecular Medicine, Cleveland Clinic, 9500 Euclid Ave, Cleveland, OH 44195, USA
| | - Marcus T. Cicerone
- Biosystems and Biomaterials Division, National Institute of Standards and Technology, 100 Bureau Dr, Gaithersburg, MD 20899, USA
- Correspondence and requests for materials should be addressed to M.T.C
| |
Collapse
|
43
|
Guo HW, Tseng TY, Dong CY, Tsai TH. Evaluation of fractional photothermolysis effect in a mouse model using nonlinear optical microscopy. JOURNAL OF BIOMEDICAL OPTICS 2014; 19:075004. [PMID: 25023413 DOI: 10.1117/1.jbo.19.7.075004] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/09/2014] [Accepted: 06/12/2014] [Indexed: 06/03/2023]
Abstract
Fractional photothermolysis (FP) induces discrete columns of photothermal damage in skin dermis, thereby promoting collagen regeneration. This technique has been widely used for treating wrinkles, sun damage, and scar. In this study, we evaluate the potential of multiphoton microscopy as a noninvasive imaging modality for the monitoring of skin rejuvenation following FP treatment. The dorsal skin of a nude mouse underwent FP treatment in order to induce microthermal zones (MTZs). We evaluated the effect of FP on skin remodeling at 7 and 14 days after treatment. Corresponding histology was performed for comparison. After 14 days of FP treatment at 10 mJ, the second harmonic generation signal recovered faster than the skin treated with 30 mJ, indicating a more rapid regeneration of dermal collagen at 10 mJ. Our results indicate that nonlinear optical microscopy is effective in detecting the damaged areas of MTZ and monitoring collagen regeneration following FP treatment.
Collapse
Affiliation(s)
- Han Wen Guo
- National Taiwan University, Department of Physics, 1 Roosevelt Road, Section 4, Taipei 106, Taiwan
| | - Te-Yu Tseng
- National Taiwan University, Department of Physics, 1 Roosevelt Road, Section 4, Taipei 106, Taiwan
| | - Chen-Yuan Dong
- National Taiwan University, Department of Physics, 1 Roosevelt Road, Section 4, Taipei 106, TaiwanbNational Taiwan University, Center for Quantum Science and Engineering, 1 Roosevelt Road, Section 4, Taipei 106, TaiwancNational Taiwan University, Center f
| | - Tsung-Hua Tsai
- Cathay General Hospital, Department of Dermatology, 280 Renai Road, Section 4, Taipei 106, Taiwan
| |
Collapse
|
44
|
Toki F, Honkura N, Shirakata Y, Imamura T, Higashiyama S, Nanba D. Second harmonic generation reveals collagen fibril remodeling in fibroblast-populated collagen gels. Cell Struct Funct 2013; 38:227-36. [PMID: 24141236 DOI: 10.1247/csf.13017] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022] Open
Abstract
Remodeling of collagen fibrils is involved in a variety of physiological and pathological processes including development, tissue repair, and metastasis. Fibroblast-populated collagen gel contraction has been employed as a model system to investigate the collagen fibril remodeling within three-dimensional collagen matrices. Research on collagen gel contraction is also important for understanding the mechanism underlying connective tissue repair, and for design considerations for engineered tissues in regenerative medicine. Second harmonic generation (SHG) is a non-linier optical effect by which well-ordered protein assemblies, including collagen fibrils, can be visualized without any labeling, and used for a noninvasive imaging of collagen fibrils in the skin. Here we demonstrate that the remodeling of collagen fibrils in the fibroblast-populated collagen gel can be analyzed by SHG imaging with a multiphoton microscope. Two models of collagen gel contraction (freely versus restrained contraction) were prepared, and orientation of fibroblasts, density, diameter, and distribution of collagen fibrils were examined by multiphoton fluorescent and SHG microscopy. Three-dimensional construction images revealed vertical and horizontal orientation of fibroblasts in freely and restrained gel contraction, respectively. Quantitative analysis indicated that collagen fibrils were accumulated within the gel and assembled into the thicker bundles in freely but not restrained collagen gel contraction. We also found that actomyosin contractility was involved in collagen fibril remodeling. This study elucidates how collagen fibrils are remodeled by fibroblasts in collagen gel contraction, and also proves that SHG microscopy can be used for the investigation of the fibroblast-populated collagen gel.
Collapse
Affiliation(s)
- Fujio Toki
- Senior Research Fellow Center, Ehime University
| | | | | | | | | | | |
Collapse
|
45
|
Bloksgaard M, Brewer J, Bagatolli LA. Structural and dynamical aspects of skin studied by multiphoton excitation fluorescence microscopy-based methods. Eur J Pharm Sci 2013; 50:586-94. [PMID: 23608611 DOI: 10.1016/j.ejps.2013.04.010] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/17/2012] [Revised: 04/08/2013] [Accepted: 04/10/2013] [Indexed: 11/19/2022]
Abstract
This mini-review reports on applications of particular multiphoton excitation microscopy-based methodologies employed in our laboratory to study skin. These approaches allow in-depth optical sectioning of the tissue, providing spatially resolved information on specific fluorescence probes' parameters. Specifically, by applying these methods, spatially resolved maps of water dipolar relaxation (generalized polarization function using the 6-lauroyl-2-(N,N-dimethylamino)naphthale probe), activity of protons (fluorescence lifetime imaging using a proton sensitive fluorescence probe--2,7-bis-(2-carboxyethyl)-5-(and-6)-carboxyfluorescein) and diffusion coefficients of distinct fluorescence probes (raster imaging correlation spectroscopy) can be obtained from different regions of the tissue. Comparative studies of different tissue strata, but also between equivalent regions of normal and abnormal excised skin, including applications of fluctuation correlation spectroscopy on transdermal penetration of liposomes are presented and discussed. The data from the different studies reported reveal the intrinsic heterogeneity of skin and also prove these strategies to be powerful noninvasive tools to explore structural and dynamical aspects of the tissue.
Collapse
Affiliation(s)
- Maria Bloksgaard
- Membrane Biophysics and Biophotonics group/MEMPHYS, Center for Biomembrane Physics, Department of Biochemistry and Molecular Biology, University of Southern Denmark, Odense, Denmark
| | | | | |
Collapse
|
46
|
Thermal transitions of fibrillar collagen unveiled by second-harmonic generation microscopy of corneal stroma. Biophys J 2013; 103:1179-87. [PMID: 22995490 DOI: 10.1016/j.bpj.2012.07.055] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/24/2012] [Revised: 07/19/2012] [Accepted: 07/27/2012] [Indexed: 11/24/2022] Open
Abstract
The thermal transitions of fibrillar collagen are investigated with second-harmonic generation polarization anisotropy microscopy. Second-harmonic generation images and polarization anisotropy profiles of corneal stroma heated in the 35-80°C range are analyzed by means of a theoretical model that is suitable to probe principal intramolecular and interfibrillar parameters of immediate physiological interest. Our results depict the tissue modification with temperature as the interplay of three destructuration stages at different hierarchical levels of collagen assembly including its tertiary structure and interfibrillar alignment, thus supporting and extending previous findings. This method holds the promise of a quantitative inspection of fundamental biophysical and biochemical processes and may find future applications in real-time and postsurgical functional imaging of collagen-rich tissues subjected to thermal treatments.
Collapse
|
47
|
Cicchi R, Vogler N, Kapsokalyvas D, Dietzek B, Popp J, Pavone FS. From molecular structure to tissue architecture: collagen organization probed by SHG microscopy. JOURNAL OF BIOPHOTONICS 2013; 6:129-42. [PMID: 22791562 DOI: 10.1002/jbio.201200092] [Citation(s) in RCA: 119] [Impact Index Per Article: 10.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/18/2012] [Revised: 06/15/2012] [Accepted: 06/15/2012] [Indexed: 05/11/2023]
Abstract
Second-harmonic generation (SHG) microscopy is a fantastic tool for imaging collagen and probing its hierarchical organization from molecular scale up to tissue architectural level. In fact, SHG combines the advantages of a non-linear microscopy approach with a coherent modality able to probe molecular organization. In this manuscript we review the physical concepts describing SHG from collagen, highlighting how this optical process allows to probe structures ranging from molecular sizes to tissue architecture, through image pattern analysis and scoring methods. Starting from the description of the most relevant approaches employing SHG polarization anisotropy and forward - backward SHG detection, we then focus on the most relevant methods for imaging and characterizing collagen organization in tissues through image pattern analysis methods, highlighting advantages and limitations of the methods applied to tissue imaging and to potential clinical applications.
Collapse
Affiliation(s)
- Riccardo Cicchi
- European Laboratory for Non-linear Spectroscopy LENS, Via Nello Carrara 1, 50019 Sesto Fiorentino, Italy.
| | | | | | | | | | | |
Collapse
|
48
|
Liu Y, Liu L, Chen M, Zhang Q. Double thermal transitions of type I collagen in acidic solution. J Biomol Struct Dyn 2012; 31:862-73. [PMID: 22963008 DOI: 10.1080/07391102.2012.715042] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
Abstract
Contributed equally to this work. To further understand the origin of the double thermal transitions of collagen in acidic solution induced by heating, the denaturation of acidic soluble collagen was investigated by micro-differential scanning calorimeter (micro-DSC), circular dichroism (CD), dynamic laser light scattering (DLLS), transmission electron microscopy (TEM), and two-dimensional (2D) synchronous fluorescence spectrum. Micro-DSC experiments revealed that the collagen exhibited double thermal transitions, which were located within 31-37 °C (minor thermal transition, T(s) ∼ 33 °C) and 37-55 °C (major thermal transition, T(m) ∼ 40 °C), respectively. The CD spectra suggested that the thermal denaturation of collagen resulted in transition from polyproline II type structure to unordered structure. The DLLS results showed that there were mainly two kinds of collagen fibrillar aggregates with different sizes in acidic solution and the larger fibrillar aggregates (T(p2) = 40 °C) had better heat resistance than the smaller one (T(p1) = 33 °C). TEM revealed that the depolymerization of collagen fibrils occurred and the periodic cross-striations of collagen gradually disappeared with increasing temperature. The 2D fluorescence correlation spectra were also applied to investigate the thermal responses of tyrosine and phenylalanine residues at the molecular level. Finally, we could draw the conclusion that (1) the minor thermal transition was mainly due to the defibrillation of the smaller collagen fibrillar aggregates and the unfolding of a little part of triple helices; (2) the major thermal transition primarily arose from the defibrillation of the larger collagen fibrillar aggregates and the complete denaturation of the majority part of triple helices.
Collapse
Affiliation(s)
- Yan Liu
- Department of Biomaterials & Artificial Organs, Institute of Biomedical Engineering, Chinese Academy of Medical Science & Peking Union Medical College, Key Laboratory of Biomedical Material of Tianjin, Tianjin 300192, China
| | | | | | | |
Collapse
|
49
|
Mazumder N, Qiu J, Foreman MR, Romero CM, Hu CW, Tsai HR, Török P, Kao FJ. Polarization-resolved second harmonic generation microscopy with a four-channel Stokes-polarimeter. OPTICS EXPRESS 2012; 20:14090-14099. [PMID: 22714473 DOI: 10.1364/oe.20.014090] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/01/2023]
Abstract
We developed a four-channel photon counting based Stokes-polarimeter for spatial characterization of polarization effects in second harmonic generation (SHG). We have implemented a calibration technique allowing quantitative measurement of polarization parameters, such as the degree of polarization (DOP), degree of linear polarization (DOLP), degree of circular polarization (DOCP), as well as anisotropy from the acquired Stokes parameters. The technique is used as contrast mechanism to characterize the polarization properties from two potassium dihydrogen phosphate (KDP) micro-crystals and collagen type-I in SHG microscopy.
Collapse
Affiliation(s)
- Nirmal Mazumder
- Institute of Biophotonics, National Yang-Ming University, 155, Li-Nong St. Taipei 11221, Taiwan
| | | | | | | | | | | | | | | |
Collapse
|
50
|
Vanzi F, Sacconi L, Cicchi R, Pavone FS. Protein conformation and molecular order probed by second-harmonic-generation microscopy. JOURNAL OF BIOMEDICAL OPTICS 2012; 17:060901. [PMID: 22734730 DOI: 10.1117/1.jbo.17.6.060901] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/15/2023]
Abstract
Second-harmonic-generation (SHG) microscopy has emerged as a powerful tool to image unstained living tissues and probe their molecular and supramolecular organization. In this article, we review the physical basis of SHG, highlighting how coherent summation of second-harmonic response leads to the sensitivity of polarized SHG to the three-dimensional distribution of emitters within the focal volume. Based on the physical description of the process, we examine experimental applications for probing the molecular organization within a tissue and its alterations in response to different biomedically relevant conditions. We also describe the approach for obtaining information on molecular conformation based on SHG polarization anisotropy measurements and its application to the study of myosin conformation in different physiological states of muscle. The capability of coupling the advantages of nonlinear microscopy (micrometer-scale resolution in deep tissue) with tools for probing molecular structure in vivo renders SHG microscopy an extremely powerful tool for the advancement of biomedical optics, with particular regard to novel technologies for molecular diagnostic in vivo.
Collapse
Affiliation(s)
- Francesco Vanzi
- University of Florence, Department of Evolutionary Biology Leo Pardi, Florence, Italy
| | | | | | | |
Collapse
|