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Jaafar A, Darvin ME, Tuchin VV, Veres M. Confocal Raman Micro-Spectroscopy for Discrimination of Glycerol Diffusivity in Ex Vivo Porcine Dura Mater. LIFE (BASEL, SWITZERLAND) 2022; 12:life12101534. [PMID: 36294969 PMCID: PMC9605590 DOI: 10.3390/life12101534] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 08/03/2022] [Revised: 08/27/2022] [Accepted: 09/26/2022] [Indexed: 11/16/2022]
Abstract
Dura mater (DM) is a connective tissue with dense collagen, which is a protective membrane surrounding the human brain. The optical clearing (OC) method was used to make DM more transparent, thereby allowing to increase in-depth investigation by confocal Raman micro-spectroscopy and estimate the diffusivity of 50% glycerol and water migration. Glycerol concentration was obtained, and the diffusion coefficient was calculated, which ranged from 9.6 × 10-6 to 3.0 × 10-5 cm2/s. Collagen-related Raman band intensities were significantly increased for all depths from 50 to 200 µm after treatment. In addition, the changes in water content during OC showed that 50% glycerol induces tissue dehydration. Weakly and strongly bound water types were found to be most concentrated, playing a major role in the glycerol-induced water flux and OC. Results show that OC is an efficient method for controlling the DM optical properties, thereby enhancing the in-depth probing for laser therapy and diagnostics of the brain. DM is a comparable to various collagen-containing tissues and organs, such as sclera of eyes and skin dermis.
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Affiliation(s)
- Ali Jaafar
- Institute for Solid State Physics and Optics, Wigner Research Center for Physics, H-1525 Budapest, Hungary
- Institute of Physics, University of Szeged, Dom ter 9, H-6720 Szeged, Hungary
- Ministry of Higher Education and Scientific Research, Baghdad 10065, Iraq
- Correspondence:
| | - Maxim E. Darvin
- Center of Experimental and Applied Cutaneous Physiology, Department of Dermatology, Venerology and Allergology, Charité Universitätsmedizin Berlin, Corporate Member of Freie Universität Berlin and Humboldt-Universität zu Berlin, Charitéplatz 1, 10117 Berlin, Germany
| | - Valery V. Tuchin
- Science Medical Center, Saratov State University, 83 Astrakhanskaya Str., 410012 Saratov, Russia
- Laboratory of Laser Diagnostics of Technical and Living Systems, Institute of Precision Mechanics and Control, FRC “Saratov Scientific Centre of the Russian Academy of Sciences”, 24 Rabochaya Str., 410028 Saratov, Russia
- A.N. Bach Institute of Biochemistry, FRC “Biotechnology of the Russian Academy of Sciences”, 33-2 Leninsky Prospect, 119071 Moscow, Russia
| | - Miklós Veres
- Institute for Solid State Physics and Optics, Wigner Research Center for Physics, H-1525 Budapest, Hungary
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2
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Gu Y, Gu Q, Yang Q, Yang M, Wang S, Liu J. Finite Element Analysis for Predicting Skin Pharmacokinetics of Nano Transdermal Drug Delivery System Based on the Multilayer Geometry Model. Int J Nanomedicine 2020; 15:6007-6018. [PMID: 32884260 PMCID: PMC7439786 DOI: 10.2147/ijn.s261386] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/08/2020] [Accepted: 07/30/2020] [Indexed: 11/23/2022] Open
Abstract
Background Skin pharmacokinetics is an indispensable indication for studying the drug fate after administration of transdermal drug delivery systems (TDDS). However, the heterogeneity and complex skin structured with stratum corneum, viable epidermis, dermis, and subcutaneous tissue inevitably leads the drug diffusion coefficient (Kp) to vary depending on the skin depth, which seriously limits the development of TDDS pharmacokinetics in full thickness skin. Methods A multilayer geometry skin model was established and the Kp of drug in SC, viable epidermis, and dermis was obtained using the technologies of molecular dynamics simulation, in vitro permeation experiments, and in vivo microdialysis, respectively. Besides, finite element analysis (FEA) based on drug Kps in different skin layers was applied to simulate the paeonol nanoemulsion (PAE-NEs) percutaneous dynamic penetration process in two and three dimensions. In addition, PAE-NEs skin pharmacokinetics profile obtained by the simulation was verified by in vivo experiment. Results Coarse-grained modeling of molecular dynamic simulation was successfully established and the Kp of PAE in SC was 2.00×10−6 cm2/h. The Kp of PAE-NE in viable epidermis and in dermis detected using penetration test and microdialysis probe technology, was 1.58×10−5 cm2/h and 3.20×10−5 cm2/h, respectively. In addition, the results of verification indicated that PAE-NEs skin pharmacokinetics profile obtained by the simulation was consistent with that by in vivo experiment. Discussion This study demonstrated that the FEA combined with the established multilayer geometry skin model could accurately predict the skin pharmacokinetics of TDDS.
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Affiliation(s)
- Yongwei Gu
- Department of Pharmacy, Fudan University Shanghai Cancer Center, Shanghai 200032, People's Republic of China.,Department of Oncology, Shanghai Medical College, Fudan University, Shanghai 200032, People's Republic of China.,Department of Pharmacy, Changhai Hospital, Second Military Medical University, Shanghai 200433, People's Republic of China
| | - Qing Gu
- Department of Pharmacy, Jingan District Zhabei Central Hospital, Shanghai 200070, People's Republic of China
| | - Qing Yang
- Department of Pharmacy, Fudan University Shanghai Cancer Center, Shanghai 200032, People's Republic of China.,Department of Oncology, Shanghai Medical College, Fudan University, Shanghai 200032, People's Republic of China
| | - Meng Yang
- Department of Pharmacy, Changhai Hospital, Second Military Medical University, Shanghai 200433, People's Republic of China
| | - Shengzhang Wang
- Institute of Biomechanics, Department of Aeronautics and Astronautics, Fudan University, Shanghai 200433, People's Republic of China
| | - Jiyong Liu
- Department of Pharmacy, Fudan University Shanghai Cancer Center, Shanghai 200032, People's Republic of China.,Department of Oncology, Shanghai Medical College, Fudan University, Shanghai 200032, People's Republic of China.,Department of Pharmacy, Changhai Hospital, Second Military Medical University, Shanghai 200433, People's Republic of China
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3
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Zhang D, Bian Q, Zhou Y, Huang Q, Gao J. The application of label-free imaging technologies in transdermal research for deeper mechanism revealing. Asian J Pharm Sci 2020; 16:265-279. [PMID: 34276818 PMCID: PMC8261078 DOI: 10.1016/j.ajps.2020.07.004] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/20/2020] [Revised: 05/23/2020] [Accepted: 07/06/2020] [Indexed: 12/13/2022] Open
Abstract
The penetration behavior of topical substances in the skin not only relates to the transdermal delivery efficiency but also involves the safety and therapeutic effect of topical products, such as sunscreen and hair growth products. Researchers have tried to illustrate the transdermal process with diversified theories and technologies. Directly observing the distribution of topical substances on skin by characteristic imaging is the most convincing approach. Unfortunately, fluorescence labeling imaging, which is commonly used in biochemical research, is limited for transdermal research for most topical substances with a molecular mass less than 500 Da. Label-free imaging technologies possess the advantages of not requiring any macromolecular dyes, no tissue destruction and an extensive substance detection capability, which has enabled rapid development of such technologies in recent years and their introduction to biological tissue analysis, such as skin samples. Through the specific identification of topical substances and endogenous tissue components, label-free imaging technologies can provide abundant tissue distribution information, enrich theoretical and practical guidance for transdermal drug delivery systems. In this review, we expound the mechanisms and applications of the most popular label-free imaging technologies in transdermal research at present, compare their advantages and disadvantages, and forecast development prospects.
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Affiliation(s)
- Danping Zhang
- Institute of Pharmaceutics, College of Pharmaceutical Sciences, Zhejiang University, Hangzhou 310058, China
| | - Qiong Bian
- Institute of Pharmaceutics, College of Pharmaceutical Sciences, Zhejiang University, Hangzhou 310058, China
| | - Yi Zhou
- Institute of Pharmaceutics, College of Pharmaceutical Sciences, Zhejiang University, Hangzhou 310058, China
| | - Qiaoling Huang
- The Third People's Hospital of Hangzhou, Hangzhou 310012, China
| | - Jianqing Gao
- Institute of Pharmaceutics, College of Pharmaceutical Sciences, Zhejiang University, Hangzhou 310058, China
- Jiangsu Engineering Research Center for New-Type External and Transdermal Preparations, Changzhou 213000, China
- Corresponding author.
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4
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Sdobnov AY, Lademann J, Darvin ME, Tuchin VV. Methods for Optical Skin Clearing in Molecular Optical Imaging in Dermatology. BIOCHEMISTRY (MOSCOW) 2019; 84:S144-S158. [PMID: 31213200 DOI: 10.1134/s0006297919140098] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
Abstract
This short review describes recent progress in using optical clearing (OC) technique in skin studies. Optical clearing is an efficient tool for enhancing the probing depth and data quality in multiphoton microscopy and Raman spectroscopy. Here, we discuss the main mechanisms of OC, its safety, advantages, and limitations. The data on the OC effect on the skin water content are presented. It was demonstrated that 70% glycerol and 100% OmnipaqueTM 300 reduce the water content in the skin. Both OC agents (OCAs) significantly affect the strongly bound and weakly bound water. However, OmnipaqueTM 300 causes considerably less skin dehydration than glycerol. In addition, the results of examination of the OC effect on autofluorescence in two-photon excitation and background fluorescence in Raman scattering at different skin depths are presented. It is shown that OmnipaqueTM 300 is a promising OCA due to its ability to reduce background fluorescence in the upper skin layers. The possibility of multimodal imaging combining optical methods and OC technique is discussed.
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Affiliation(s)
- A Yu Sdobnov
- Faculty of Information Technology and Electrical Engineering, University of Oulu, Oulu, 90570, Finland. .,Research-Educational Institute of Optics and Biophotonics, Saratov State University, Saratov, 410012, Russia
| | - J Lademann
- Center of Experimental and Applied Cutaneous Physiology, Department of Dermatology, Venerology and Allergology, Charité - Universitätsmedizin Berlin, corporate member of Freie Universität Berlin, Humboldt-Universität zu Berlin, and Berlin Institute of Health, Berlin, 10117, Germany
| | - M E Darvin
- Center of Experimental and Applied Cutaneous Physiology, Department of Dermatology, Venerology and Allergology, Charité - Universitätsmedizin Berlin, corporate member of Freie Universität Berlin, Humboldt-Universität zu Berlin, and Berlin Institute of Health, Berlin, 10117, Germany
| | - V V Tuchin
- Research-Educational Institute of Optics and Biophotonics, Saratov State University, Saratov, 410012, Russia.,Laboratory of Laser Diagnostics of Technical and Living Systems, Institute of Precision Mechanics and Control, Russian Academy of Sciences, Saratov, 410028, Russia.,Interdisciplinary Laboratory of Biophotonics, Tomsk State University, Tomsk, 634050, Russia.,Bach Institute of Biochemistry, Research Center of Biotechnology of the Russian Academy of Sciences, Moscow, 119071, Russia
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5
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Carneiro I, Carvalho S, Henrique R, Oliveira LM, Tuchin VV. A robust ex vivo method to evaluate the diffusion properties of agents in biological tissues. JOURNAL OF BIOPHOTONICS 2019; 12:e201800333. [PMID: 30585430 DOI: 10.1002/jbio.201800333] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/31/2018] [Revised: 11/30/2018] [Accepted: 12/23/2018] [Indexed: 06/09/2023]
Abstract
A robust method is presented for evaluating the diffusion properties of chemicals in ex vivo biological tissues. Using this method that relies only on thickness and collimated transmittance measurements, the diffusion properties of glycerol, fructose, polypropylene glycol and water in muscle tissues were evaluated. Amongst other results, the diffusion coefficient of glycerol in colorectal muscle was estimated with a value of 3.3 × 10-7 cm2 /s. Due to the robustness and simplicity of the method, it can be used in other fields of biomedical engineering, namely in organ cryoprotection and food industry.
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Affiliation(s)
- Isa Carneiro
- Department of Pathology and Cancer Biology, and Epigenetics Group - Research Center, Portuguese Oncology Institute of Porto, Porto, Portugal
| | - Sónia Carvalho
- Department of Pathology and Cancer Biology, and Epigenetics Group - Research Center, Portuguese Oncology Institute of Porto, Porto, Portugal
| | - Rui Henrique
- Department of Pathology and Cancer Biology, and Epigenetics Group - Research Center, Portuguese Oncology Institute of Porto, Porto, Portugal
- Department of Pathology and Molecular Immunology, Institute of Biomedical Sciences Abel Salazar - University of Porto (ICBAS-UP), Porto, Portugal
| | - Luís M Oliveira
- Physics Department - Polytechnic Institute of Porto, School of Engineering, Porto, Portugal
- Centre of Innovation in Engineering and Industrial Technology (CIETI), School of Engineering, Polytechnic of Porto, Porto, Portugal
| | - Valery V Tuchin
- Research-Educational Institute of Optics and Biophotonics, Saratov State University, Saratov, Russian Federation
- Interdisciplinary Laboratory of Biophotonics, Tomsk State University, Tomsk, Russian Federation
- Laboratory of Femtomedicine, ITMO University, Saint-Petersburg, Russian Federation
- Laboratory of Laser Diagnostics of Technical and Living Systems, Institute of Precision Mechanics and Control of the Russian Academy of Sciences, Saratov, Russian Federation
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Marzi J, Biermann AC, Brauchle EM, Brockbank KGM, Stock UA, Schenke-Layland K. Marker-Independent In Situ Quantitative Assessment of Residual Cryoprotectants in Cardiac Tissues. Anal Chem 2019; 91:2266-2272. [DOI: 10.1021/acs.analchem.8b04861] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Julia Marzi
- Department of Women’s Health, Research Institute for Women’s Health, Eberhard Karls University Tübingen, 72076 Tübingen, Germany
| | - Anna C. Biermann
- Department for Thoracic and Cardiovascular Surgery, Johann Wolfgang Goethe University, 60596 Frankfurt am Main, Germany
- Department of Cardiothoracic Surgery, Royal Brompton and Harefield Foundation Trust; Harefield UB96JH, United Kingdom
| | - Eva M. Brauchle
- Department of Women’s Health, Research Institute for Women’s Health, Eberhard Karls University Tübingen, 72076 Tübingen, Germany
- Natural and Medical Sciences Institute (NMI) at the University of Tübingen, 72770 Reutlingen, Germany
| | - Kelvin G. M. Brockbank
- Tissue Testing Technologies LLC., North Charleston, South Carolina 20406, United States
- Department of Bioengineering, Clemson University, Clemson, South Carolina 29634, United States
| | - Ulrich A. Stock
- Department for Thoracic and Cardiovascular Surgery, Johann Wolfgang Goethe University, 60596 Frankfurt am Main, Germany
- Department of Cardiothoracic Surgery, Royal Brompton and Harefield Foundation Trust; Harefield UB96JH, United Kingdom
- Imperial College London, London SW72AZ, United Kingdom
- Magdi Yacoub Institute, Harefield UB96JH, United Kingdom
| | - Katja Schenke-Layland
- Department of Women’s Health, Research Institute for Women’s Health, Eberhard Karls University Tübingen, 72076 Tübingen, Germany
- Natural and Medical Sciences Institute (NMI) at the University of Tübingen, 72770 Reutlingen, Germany
- Department of Medicine, Cardiovascular Research Laboratories, David Geffen School of Medicine at UCLA, Los Angeles, California 90095, United States
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Sdobnov AY, Darvin ME, Genina EA, Bashkatov AN, Lademann J, Tuchin VV. Recent progress in tissue optical clearing for spectroscopic application. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2018; 197:216-229. [PMID: 29433855 DOI: 10.1016/j.saa.2018.01.085] [Citation(s) in RCA: 40] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/13/2017] [Revised: 01/25/2018] [Accepted: 01/31/2018] [Indexed: 05/03/2023]
Abstract
This paper aims to review recent progress in optical clearing of the skin and over naturally turbid biological tissues and blood using this technique in vivo and in vitro with multiphoton microscopy, confocal Raman microscopy, confocal microscopy, NIR spectroscopy, optical coherence tomography, and laser speckle contrast imaging. Basic principles of the technique, its safety, advantages and limitations are discussed. The application of optical clearing agent on a tissue allows for controlling the optical properties of tissue. Optical clearing-induced reduction of tissue scattering significantly facilitates the observation of deep-located tissue regions, at the same time improving the resolution and image contrast for a variety of optical imaging methods suitable for clinical applications, such as diagnostics and laser treatment of skin diseases, mucosal tumor imaging, laser disruption of pathological abnormalities, etc.
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Affiliation(s)
- A Yu Sdobnov
- Faculty of Information Technology and Electrical Engineering, University of Oulu, Oulu 90570, Finland; Research-Educational Institute of Optics and Biophotonics, Saratov State University (National Research University of Russia), Astrakhanskaya 83, 410012 Saratov, Russian Federation.
| | - M E Darvin
- Center of Experimental and Applied Cutaneous Physiology, Department of Dermatology, Venerology and Allergology, Charité - Universitätsmedizin Berlin, Corporate member of Freie Universität Berlin, Humboldt-Universität zu Berlin, Berlin Institute of Health, Charitéplatz 1, 10117 Berlin, Germany
| | - E A Genina
- Research-Educational Institute of Optics and Biophotonics, Saratov State University (National Research University of Russia), Astrakhanskaya 83, 410012 Saratov, Russian Federation; Interdisciplinary Laboratory of Biophotonics, Tomsk State University (National Research University of Russia), Lenin's av. 36, 634050 Tomsk, Russian Federation
| | - A N Bashkatov
- Research-Educational Institute of Optics and Biophotonics, Saratov State University (National Research University of Russia), Astrakhanskaya 83, 410012 Saratov, Russian Federation; Interdisciplinary Laboratory of Biophotonics, Tomsk State University (National Research University of Russia), Lenin's av. 36, 634050 Tomsk, Russian Federation
| | - J Lademann
- Center of Experimental and Applied Cutaneous Physiology, Department of Dermatology, Venerology and Allergology, Charité - Universitätsmedizin Berlin, Corporate member of Freie Universität Berlin, Humboldt-Universität zu Berlin, Berlin Institute of Health, Charitéplatz 1, 10117 Berlin, Germany
| | - V V Tuchin
- Research-Educational Institute of Optics and Biophotonics, Saratov State University (National Research University of Russia), Astrakhanskaya 83, 410012 Saratov, Russian Federation; Interdisciplinary Laboratory of Biophotonics, Tomsk State University (National Research University of Russia), Lenin's av. 36, 634050 Tomsk, Russian Federation; Laboratory of Laser Diagnostics of Technical and Living Systems, Institute of Precision Mechanics and Control RAS, Rabochaya 24, 410028 Saratov, Russian Federation
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8
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Carvalho S, Gueiral N, Nogueira E, Henrique R, Oliveira L, Tuchin VV. Glucose diffusion in colorectal mucosa-a comparative study between normal and cancer tissues. JOURNAL OF BIOMEDICAL OPTICS 2017; 22:91506. [PMID: 28241323 DOI: 10.1117/1.jbo.22.9.091506] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/14/2016] [Accepted: 01/31/2017] [Indexed: 05/21/2023]
Abstract
Colorectal carcinoma is a major health concern worldwide and its high incidence and mortality require accurate screening methods. Following endoscopic examination, polyps must be removed for histopathological characterization. Aiming to contribute to the improvement of current endoscopy methods of colorectal carcinoma screening or even for future development of laser treatment procedures, we studied the diffusion properties of glucose and water in colorectal healthy and pathological mucosa. These parameters characterize the tissue dehydration and the refractive index matching mechanisms of optical clearing (OC). We used ex vivo tissues to measure the collimated transmittance spectra and thickness during treatments with OC solutions containing glucose in different concentrations. These time dependencies allowed for estimating the diffusion time and diffusion coefficient values of glucose and water in both types of tissues. The measured diffusion times for glucose in healthy and pathological mucosa samples were 299.2 ± 4.7 ?? s and 320.6 ± 10.6 ?? s for 40% and 35% glucose concentrations, respectively. Such a difference indicates a slower glucose diffusion in cancer tissues, which originate from their ability to trap far more glucose than healthy tissues. We have also found a higher free water content in cancerous tissue that is estimated as 64.4% instead of 59.4% for healthy mucosa.
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Affiliation(s)
- Sónia Carvalho
- Portuguese Oncology Institute of Porto, Department of Pathology and Cancer Biology and Epigenetics Group-Research Centre, Porto, Portugal
| | - Nuno Gueiral
- Polytechnic of Porto, School of Engineering, Physics Department, Porto, PortugalcCentre of Innovation in Engineering and Industrial Technology, ISEP, Porto, Portugal
| | - Elisabete Nogueira
- Polytechnic of Porto, School of Engineering, Physics Department, Porto, PortugalcCentre of Innovation in Engineering and Industrial Technology, ISEP, Porto, Portugal
| | - Rui Henrique
- Portuguese Oncology Institute of Porto, Department of Pathology and Cancer Biology and Epigenetics Group-Research Centre, Porto, PortugaldUniversity of Porto (ICBAS-UP), Institute of Biomedical Sciences Abel Salazar, Department of Pathology and Molecular Immunology, Porto, Portugal
| | - Luís Oliveira
- Polytechnic of Porto, School of Engineering, Physics Department, Porto, PortugalcCentre of Innovation in Engineering and Industrial Technology, ISEP, Porto, Portugal
| | - Valery V Tuchin
- Saratov National Research State University, Research-Educational Institute of Optics and Biophotonics, Saratov, RussiafPrecision Mechanics and Control Institute of the Russian Academy of Sciences, Laboratory of Laser Diagnostics of Technical and Living Systems, Saratov, RussiagNational Research Tomsk State University, Interdisciplinary Laboratory of Biophotonics, Tomsk, Russia
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Römgens AM, Bader DL, Bouwstra JA, Baaijens FPT, Oomens CWJ. Diffusion profile of macromolecules within and between human skin layers for (trans)dermal drug delivery. J Mech Behav Biomed Mater 2015; 50:215-22. [PMID: 26151288 DOI: 10.1016/j.jmbbm.2015.06.019] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/23/2015] [Revised: 06/12/2015] [Accepted: 06/16/2015] [Indexed: 12/29/2022]
Abstract
Delivering a drug into and through the skin is of interest as the skin can act as an alternative drug administration route for oral delivery. The development of new delivery methods, such as microneedles, makes it possible to not only deliver small molecules into the skin, which are able to pass the outer layer of the skin in therapeutic amounts, but also macromolecules. To provide insight into the administration of these molecules into the skin, the aim of this study was to assess the transport of macromolecules within and between its various layers. The diffusion coefficients in the epidermis and several locations in the papillary and reticular dermis were determined for fluorescein dextran of 40 and 500 kDa using a combination of fluorescent recovery after photobleaching experiments and finite element analysis. The diffusion coefficient was significantly higher for 40 kDa than 500 kDa dextran, with median values of 23 and 9 µm(2)/s in the dermis, respectively. The values only marginally varied within and between papillary and reticular dermis. For the 40 kDa dextran, the diffusion coefficient in the epidermis was twice as low as in the dermis layers. The adopted method may be used for other macromolecules, which are of interest for dermal and transdermal drug delivery. The knowledge about diffusion in the skin is useful to optimize (trans)dermal drug delivery systems to target specific layers or cells in the human skin.
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Affiliation(s)
- Anne M Römgens
- Soft Tissue Biomechanics and Engineering, Department of Biomedical Engineering, Eindhoven University of Technology, P.O. Box 513, 5600 MB Eindhoven, The Netherlands.
| | - Dan L Bader
- Soft Tissue Biomechanics and Engineering, Department of Biomedical Engineering, Eindhoven University of Technology, P.O. Box 513, 5600 MB Eindhoven, The Netherlands; Faculty of Health Sciences, University of Southampton, Southampton SO17 1BJ, UK
| | - Joke A Bouwstra
- Division of Drug Delivery Technology, Leiden Academic Centre for Drug Research, Leiden University, P.O. Box 9502, 2300 RA Leiden, The Netherlands
| | - Frank P T Baaijens
- Soft Tissue Biomechanics and Engineering, Department of Biomedical Engineering, Eindhoven University of Technology, P.O. Box 513, 5600 MB Eindhoven, The Netherlands
| | - Cees W J Oomens
- Soft Tissue Biomechanics and Engineering, Department of Biomedical Engineering, Eindhoven University of Technology, P.O. Box 513, 5600 MB Eindhoven, The Netherlands
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Yang X, Liu Y, Zhu D, Shi R, Luo Q. Dynamic monitoring of optical clearing of skin using photoacoustic microscopy and ultrasonography. OPTICS EXPRESS 2014; 22:1094-104. [PMID: 24515069 DOI: 10.1364/oe.22.001094] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
Abstract
Tissue optical clearing technique has shown great potential for enhancing the imaging depth and contrast of optical imaging modalities. However, the mechanism of optical clearing is still in controversy. In this manuscript, we combined photoacoustic microscopy with ultrasonography to monitor the dermic changes induced by optical clearing agents at different immersion time points. The measured parameters were correlated with the optical clearing process, and could be used to assess the optical clearing effect. Both in vitro and in vivo results demonstrated that photoacoustic microscopy and ultrasonography can potentially be used as a powerful tool in screening optical clearing agents and exploring the mechanism of optical clearing.
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