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Xavier LCG, Matos BN, Barbalho GN, Falcão MA, Cunha-Filho M, Gelfuso GM, Gratieri T. In Vitro Performance Analysis of a Minoxidil Thermosensitive Gel with Reduced Runoff for Eyebrow Hair Growth. Gels 2023; 9:gels9040269. [PMID: 37102881 PMCID: PMC10137639 DOI: 10.3390/gels9040269] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/27/2023] [Revised: 03/14/2023] [Accepted: 03/22/2023] [Indexed: 04/28/2023] Open
Abstract
There is a growing interest in innovative products for eyebrow hair loss treatment with fewer adverse effects. Nevertheless, a fundamental formulation aspect of preventing the fragile skin from the ocular region from being irritated is that the formulations remain restricted to the application region and do not run off. Consequently, the methods and protocols in drug delivery scientific research must be adapted to fulfill such performance analysis demand. Thus, this work aimed to propose a novel protocol to evaluate the in vitro performance of a topical gel formulation with a reduced runoff for minoxidil (MXS) delivery to eyebrows. MXS was formulated with 16% poloxamer 407 (PLX) and 0.4% of hydroxypropyl methylcellulose (HPMC). The sol/gel transition temperature, viscosity at 25 °C, and formulation runoff distance on the skin were evaluated to characterize the formulation. The release profile and skin permeation were evaluated in Franz vertical diffusion cells for 12 h and compared to a control formulation (4% PLX and 0.7% HPMC). Then, the formulation's performance at promoting minoxidil skin penetration with minimum runoff was evaluated in a vertical custom-made permeation template (divided into three areas: superior, middle, and inferior). The MXS release profile from the test formulation was comparable to that from the MXS solution and the control formulation. There was also no difference in the MXS amount that penetrated the skin in the permeation experiments in Franz diffusion cells using the different formulations (p > 0.05). However, the test formulation demonstrated a localized MXS delivery at the application site in the vertical permeation experiment. In conclusion, the proposed protocol could differentiate the test formulation from the control, attesting to its better performance in efficiently delivering MXS to the site of interest (middle third of application). The vertical protocol can be easily employed to evaluate other gels with a drip-free appeal.
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Affiliation(s)
- Luciano C G Xavier
- Laboratory of Food, Drugs, and Cosmetics (LTMAC), University of Brasilia, Brasília 70910-900, Brazil
| | - Breno N Matos
- Laboratory of Food, Drugs, and Cosmetics (LTMAC), University of Brasilia, Brasília 70910-900, Brazil
| | - Geisa N Barbalho
- Laboratory of Food, Drugs, and Cosmetics (LTMAC), University of Brasilia, Brasília 70910-900, Brazil
| | - Manuel A Falcão
- Laboratory of Food, Drugs, and Cosmetics (LTMAC), University of Brasilia, Brasília 70910-900, Brazil
| | - Marcilio Cunha-Filho
- Laboratory of Food, Drugs, and Cosmetics (LTMAC), University of Brasilia, Brasília 70910-900, Brazil
| | - Guilherme M Gelfuso
- Laboratory of Food, Drugs, and Cosmetics (LTMAC), University of Brasilia, Brasília 70910-900, Brazil
| | - Tais Gratieri
- Laboratory of Food, Drugs, and Cosmetics (LTMAC), University of Brasilia, Brasília 70910-900, Brazil
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Wang J, Nitsche JM, Kasting GB, Wittum G, Nägel A. Transdermal and lateral effective diffusivities for drug transport in stratum corneum from a microscopic anisotropic diffusion model. Eur J Pharm Biopharm 2023:S0939-6411(23)00032-2. [PMID: 36764498 DOI: 10.1016/j.ejpb.2023.01.025] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/22/2021] [Revised: 10/10/2022] [Accepted: 01/27/2023] [Indexed: 02/11/2023]
Abstract
This paper presents a computational model of molecular diffusion through the interfollicular stratum corneum. Specifically, it extends an earlier two-dimensional microscopic model for the permeability in two ways: (1) a microporous leakage pathway through the intercellular lipid lamellae allows slow permeation of highly hydrophilic permeants through the tissue; and (2) the model yields explicit predictions of both lateral (D‾‖sc) and transdermal (D‾⊥sc) effective (average, homogenized) diffusivities of solutes within the tissue. We present here the mathematical framework for the analysis and a comparison of the predictions with experimental data on desorption of both hydrophilic and lipophilic solutes from human stratum corneum in vitro. Diffusion in the lipid lamellae is found to make the effective diffusivity highly anisotropic, with the predicted ratio D‾‖sc/D‾⊥sc ranging from 34-39 for fully hydrated skin and 150 to more than 1000 for partially hydrated skin. The diffusivities and their ratio are in accord with both experimental data and the results of mathematical analyses performed by others.
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Affiliation(s)
- Junxi Wang
- Goethe Center for Scientific Computing, Kettenhofweg 139, Goethe University, 60325 Frankfurt a.M., Germany
| | - Johannes M Nitsche
- Department of Chemical and Biological Engineering, University at Buffalo, The State University of New York, Buffalo, NY 14260-4200, USA
| | - Gerald B Kasting
- James L. Winkle College of Pharmacy, University of Cincinnati Academic Health Center, Cincinnati, OH 45267-0514, USA
| | - Gabriel Wittum
- Goethe Center for Scientific Computing, Kettenhofweg 139, Goethe University, 60325 Frankfurt a.M., Germany; King Abdullah University of Science and Technology (KAUST), Thuwal, Saudi-Arabia
| | - Arne Nägel
- Goethe Center for Scientific Computing, Kettenhofweg 139, Goethe University, 60325 Frankfurt a.M., Germany.
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3
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Roberts MS, Cheruvu HS, Mangion SE, Alinaghi A, Benson HA, Mohammed Y, Holmes A, van der Hoek J, Pastore M, Grice JE. Topical drug delivery: History, percutaneous absorption, and product development. Adv Drug Deliv Rev 2021; 177:113929. [PMID: 34403750 DOI: 10.1016/j.addr.2021.113929] [Citation(s) in RCA: 72] [Impact Index Per Article: 24.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/25/2021] [Revised: 08/05/2021] [Accepted: 08/11/2021] [Indexed: 02/07/2023]
Abstract
Topical products, widely used to manage skin conditions, have evolved from simple potions to sophisticated delivery systems. Their development has been facilitated by advances in percutaneous absorption and product design based on an increasingly mechanistic understanding of drug-product-skin interactions, associated experiments, and a quality-by-design framework. Topical drug delivery involves drug transport from a product on the skin to a local target site and then clearance by diffusion, metabolism, and the dermal circulation to the rest of the body and deeper tissues. Insights have been provided by Quantitative Structure Permeability Relationships (QSPR), molecular dynamics simulations, and dermal Physiologically Based PharmacoKinetics (PBPK). Currently, generic product equivalents of reference-listed products dominate the topical delivery market. There is an increasing regulatory interest in understanding topical product delivery behavior under 'in use' conditions and predicting in vivo response for population variations in skin barrier function and response using in silico and in vitro findings.
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4
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Law RM, Maibach HI. Lateral spread and percutaneous penetration: An overview. Int J Pharm 2020; 588:119765. [PMID: 32800936 DOI: 10.1016/j.ijpharm.2020.119765] [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: 06/20/2020] [Revised: 07/30/2020] [Accepted: 08/10/2020] [Indexed: 11/29/2022]
Abstract
Lateral spread, a phenomenon with significance for percutaneous application of drugs or chemicals but often overlooked, is a competitive process to drug or chemical penetration into stratum corneum and beyond. Its effect may vary depending on factors such as physicochemical properties, formulation, skin surface topography etc. It may impact clinical use of topical drugs or percutaneous research including bioequivalence studies. Consequences may include less drug absorbed systemically or reduced rate of absorption. For quantitation studies and risk assessment, lateral spread may need to be incorporated as a "correction factor".
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Affiliation(s)
- Rebecca M Law
- School of Pharmacy & Faculty of Medicine, Memorial University of Newfoundland, St. John's, NL, Canada.
| | - Howard I Maibach
- Department of Dermatology, University of California San Francisco, San Francisco, CA, USA
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5
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Mojsiewicz-Pieńkowska K, Stachowska E, Krenczkowska D, Bazar D, Meijer F. Evidence of Skin Barrier Damage by Cyclic Siloxanes (Silicones)-Using Digital Holographic Microscopy. Int J Mol Sci 2020; 21:ijms21176375. [PMID: 32887477 PMCID: PMC7504040 DOI: 10.3390/ijms21176375] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/13/2020] [Accepted: 08/31/2020] [Indexed: 11/16/2022] Open
Abstract
Cyclic siloxanes (D4, D5, D6) are widely used in skin products. They improve skin sensory properties and alleviate dry skin, but there is still one report (published 2019), which regards their effects on the destruction of the skin barrier, by using fluorescence microscopy and attenuated total reflection Fourier-transform infrared spectroscopy (ATR-FTIR). A new skin-imaging technique, digital holographic microscopy (DHM), was used for the first time to investigate the impact of D4, D5, and D6 on the skin barrier. We observed irreversible damage of the stratum corneum due to the interaction with cyclic siloxanes. These substances changed: (a) the first level of the skin barrier through destabilization of the intercellular lipid lamellae and destruction of the corneocyte structure (measured with axial nanometer resolution), (b) the second level by collapse of not only corneocytes but also of a significant part of the clusters, leading to the loss of the stratum corneum integrity and formation of the lacunae, (c) the third level as an effect of the change in the surface geometrical topography of the stratum corneum and disruption of the integrity of this skin layer, measured with lateral micrometer resolution. DHM allowed also to identify an important pathway for substances to penetrate into the skin through canyons surrounding the clusters. Our investigations provide advanced information for understanding the mechanisms by which various substances pass the skin barrier, including uncontrolled diffusion into the skin.
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Affiliation(s)
- Krystyna Mojsiewicz-Pieńkowska
- Department of Physical Chemistry, Faculty of Pharmacy, Medical University of Gdańsk, al. gen. Józefa Hallera 107, 80-416 Gdańsk, Poland; (D.K.); (D.B.)
- Correspondence: ; Tel.: +48-58-3491656
| | - Ewa Stachowska
- Department of Metrology and Measurement Systems, Faculty of Mechanical Engineering and Management, Poznan University of Technology, ul. Piotrowo 3, 60-965 Poznan, Poland; (E.S.); (F.M.)
| | - Dominika Krenczkowska
- Department of Physical Chemistry, Faculty of Pharmacy, Medical University of Gdańsk, al. gen. Józefa Hallera 107, 80-416 Gdańsk, Poland; (D.K.); (D.B.)
| | - Dagmara Bazar
- Department of Physical Chemistry, Faculty of Pharmacy, Medical University of Gdańsk, al. gen. Józefa Hallera 107, 80-416 Gdańsk, Poland; (D.K.); (D.B.)
| | - Frans Meijer
- Department of Metrology and Measurement Systems, Faculty of Mechanical Engineering and Management, Poznan University of Technology, ul. Piotrowo 3, 60-965 Poznan, Poland; (E.S.); (F.M.)
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6
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Law RM, Ngo MA, Maibach HI. Twenty Clinically Pertinent Factors/Observations for Percutaneous Absorption in Humans. Am J Clin Dermatol 2020; 21:85-95. [PMID: 31677110 DOI: 10.1007/s40257-019-00480-4] [Citation(s) in RCA: 25] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
At least 20 clinically relevant factors affect percutaneous absorption of drugs and chemicals: relevant physico-chemical properties, vehicle/formulation, drug exposure conditions (dose, duration, surface area, exposure frequency), skin appendages (hair follicles, glands) as sub-anatomical pathways, skin application sites (regional variation in penetration), population variability (premature, infants, and aged), skin surface conditions (hydration, temperature, pH), skin health and integrity (trauma, skin diseases), substantivity and binding to different skin components, systemic distribution and systemic toxicity, stratum corneum exfoliation, washing-off and washing-in, rubbing/massaging, transfer to others (human to human and hard surface to human), volatility, metabolic biotransformation/cutaneous metabolism, photochemical transformation and photosensitivity, excretion pharmacokinetics, lateral spread, and chemical method of determining percutaneous absorption.
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Affiliation(s)
- Rebecca M Law
- School of Pharmacy, Memorial University of Newfoundland, H3440, 300 Prince Phillip Dr., St. John's, NL, A1B 3V6, Canada.
- Department of Dermatology, UCSF School of Medicine, N461 2340 Sutter Street, San Francisco, CA, 94115, USA.
| | - Mai A Ngo
- California Department of Toxic Substances Control, 8800 Cal Center Drive, Sacramento, CA, 95826, USA
| | - Howard I Maibach
- Department of Dermatology, UCSF School of Medicine, N461 2340 Sutter Street, San Francisco, CA, 94115, USA
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7
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Jung S, Nagel G, Giulbudagian M, Calderón M, Patzelt A, Knorr F, Lademann J. Temperature-Enhanced Follicular Penetration of Thermoresponsive Nanogels. ACTA ACUST UNITED AC 2018. [DOI: 10.1515/zpch-2017-1080] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Abstract
Abstract
Hair follicles can serve as an effective reservoir for dermal drug delivery upon the topical application of particulate substances. Here, the follicular penetration of an indodicarbocyanine-labelled thermoresponsive nanogel (189 nm) having a cloud point temperature of 34°C and linked via an acid-labile linker to the model drug indocarbocyanine was investigated. In total, 227 hair follicles of porcine ear skin were examined after topical application of the thermoresponsive nanogels at room temperature (21°C), physiological skin surface temperature (32°C) and core body temperature (37°C) for the follicular penetration depths of indodicarbocyanine and indocarbocyanine using confocal laser scanning microscopy. The results showed a significantly increased mean follicular penetration of the carrier to a depth of 298.8±85.8 μm after incubation at 37°C compared to samples incubated at 21°C and 32°C with mean follicular penetration depths of 202.7±81.7 μm and 219.4±52.9 μm, respectively (p<0.001). Possibly structural changes in the thermoresponsive nanogel induced by the increased incubation temperature led to an enhancement of follicular penetration. Therefore, thermoresponsive nanogels may be suitable for the temperature-enhanced penetration into the hair follicles under physiological conditions.
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Affiliation(s)
- Sora Jung
- Charité – Universitätsmedizin Berlin, Corporate Member of Freie Universität Berlin, Humboldt-Universität zu Berlin , and Berlin Institute of Health, Center of Experimental and Applied Cutaneous Physiology , Department of Dermatology, Venerology and Allergology, Charitéplatz 1 , 10117 Berlin , Germany
| | - Gregor Nagel
- Freie Universität Berlin , Institute of Chemistry and Biochemistry , Takustr. 3, 14195 Berlin , Germany
| | - Michael Giulbudagian
- Freie Universität Berlin , Institute of Chemistry and Biochemistry , Takustr. 3, 14195 Berlin , Germany
| | - Marcelo Calderón
- Freie Universität Berlin , Institute of Chemistry and Biochemistry , Takustr. 3, 14195 Berlin , Germany
| | - Alexa Patzelt
- Charité – Universitätsmedizin Berlin, Corporate Member of Freie Universität Berlin, Humboldt-Universität zu Berlin , and Berlin Institute of Health, Center of Experimental and Applied Cutaneous Physiology , Department of Dermatology, Venerology and Allergology, Charitéplatz 1 , 10117 Berlin , Germany
| | - Fanny Knorr
- Charité – Universitätsmedizin Berlin, Corporate Member of Freie Universität Berlin, Humboldt-Universität zu Berlin , and Berlin Institute of Health, Center of Experimental and Applied Cutaneous Physiology , Department of Dermatology, Venerology and Allergology, Charitéplatz 1 , 10117 Berlin , Germany
| | - Jürgen Lademann
- Charité – Universitätsmedizin Berlin, Corporate Member of Freie Universität Berlin, Humboldt-Universität zu Berlin , and Berlin Institute of Health, Center of Experimental and Applied Cutaneous Physiology , Department of Dermatology, Venerology and Allergology, Charitéplatz 1 , 10117 Berlin , Germany
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8
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Rush AK, Miller MA, Smith ED, Kasting GB. A quantitative radioluminographic imaging method for evaluating lateral diffusion rates in skin. J Control Release 2015; 216:1-8. [DOI: 10.1016/j.jconrel.2015.07.032] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/18/2015] [Revised: 07/29/2015] [Accepted: 07/30/2015] [Indexed: 11/28/2022]
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9
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Vieille-Petit A, Blickenstaff N, Coman G, Maibach H. Metrics and Clinical Relevance of Percutaneous Penetration and Lateral Spreading. Skin Pharmacol Physiol 2014; 28:57-64. [DOI: 10.1159/000363148] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/14/2014] [Accepted: 04/24/2014] [Indexed: 11/19/2022]
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10
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Zhang Q, Saad P, Mao G, Walters RM, Mack Correa MC, Mendelsohn R, Flach CR. Infrared spectroscopic imaging tracks lateral distribution in human stratum corneum. Pharm Res 2014; 31:2762-73. [PMID: 24792828 DOI: 10.1007/s11095-014-1373-8] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/14/2014] [Accepted: 03/21/2014] [Indexed: 10/25/2022]
Abstract
PURPOSE To demonstrate the efficacy of infrared (IR) spectroscopic imaging for evaluation of lateral diffusion in stratum corneum (SC) and for elucidation of intermolecular interactions between exogenous agents and SC constituents. METHODS In separate experiments, acyl chain perdeuterated oleic acid (OA-d) and deuterated dimethyl sulfoxide (DMSO-d) were applied to the surface of isolated human SC. The lateral distribution of permeant concentrations was monitored using the time-dependence of IR images. Diffusion coefficients (D) were estimated from Fick's second law. Interactions between the exogenous agents and the SC were tracked from changes in CD2 and Amide I stretching frequencies. RESULTS Networked glyphs served as the major pathway for lateral distribution of OA-d. In glyph-poor regions, D values from 0.3-1 × 10(-8) cm(2)/s bracketed the OA-d data and apparently decreased with time. Although diffusion of DMSO-d is relatively fast compared to our experimental measurement time, the results suggest values of ~10(-7) cm(2)/s. OA-d spectral changes suggest penetration into the ordered lipids of the SC; DMSO-d penetration results in perturbation of SC keratin structure. CONCLUSIONS IR imaging provides concentration profiles, diffusion coefficients, and unique molecular level information about structural changes in the endogenous SC constituents and exogenous agents upon their mutual interaction. Transport along glyphs is the dominant mode of distribution for OA-d.
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Affiliation(s)
- Qihong Zhang
- Department of Chemistry, Rutgers University, 73 Warren Street, Newark, New Jersey, 07102, USA
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11
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Kluschke F, Weigmann H, Schanzer S, Meinke M, Vergou T, Sterry W, Lademann J. Gain or Loss Sunscreen Efficiency after Cosmetic Pretreatment of the Skin. Skin Pharmacol Physiol 2014; 27:82-9. [DOI: 10.1159/000351549] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/24/2012] [Accepted: 04/23/2013] [Indexed: 11/19/2022]
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12
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Selzer D, Hahn T, Naegel A, Heisig M, Kostka KH, Lehr CM, Neumann D, Schaefer UF, Wittum G. Finite dose skin mass balance including the lateral part: comparison between experiment, pharmacokinetic modeling and diffusion models. J Control Release 2012; 165:119-28. [PMID: 23099116 DOI: 10.1016/j.jconrel.2012.10.009] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/19/2012] [Revised: 10/10/2012] [Accepted: 10/12/2012] [Indexed: 11/29/2022]
Abstract
This work investigates in vitro finite dose skin absorption of the model compounds flufenamic acid and caffeine experimentally and mathematically. The mass balance in different skin compartments (donor, stratum corneum (SC), deeper skin layers (DSL), lateral skin parts and acceptor) is analyzed as a function of time. For both substances high amounts were found in the lateral skin compartment after 6h of incubation, which emphasizes not to elide these parts in the modeling. Here, three different mathematical models were investigated and tested with the experimental data: a pharmacokinetic model (PK), a detailed microscopic two-dimensional diffusion model (MICRO) and a macroscopic homogenized diffusion model (MACRO). While the PK model was fitted to the experimental data, the MICRO and the MACRO models employed input parameters derived from infinite dose studies to predict the underlying diffusion process. All models could satisfyingly predict or describe the experimental data. The PK model and MACRO model also feature the lateral parts.
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Affiliation(s)
- D Selzer
- Biopharmaceutics and Pharmaceutical Technology, Saarland University, Saarbruecken, Germany
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13
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Lademann J, Meinke MC, Schanzer S, Richter H, Darvin ME, Haag SF, Fluhr JW, Weigmann HJ, Sterry W, Patzelt A. In vivo methods for the analysis of the penetration of topically applied substances in and through the skin barrier. Int J Cosmet Sci 2012; 34:551-9. [PMID: 22957937 DOI: 10.1111/j.1468-2494.2012.00750.x] [Citation(s) in RCA: 39] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/02/2012] [Accepted: 08/14/2012] [Indexed: 01/21/2023]
Abstract
The efficacy of a drug is characterized by its action mechanism and its ability to pass the skin barrier. In this article, different methods are discussed, which permit this penetration process to be analysed non-invasively. Providing qualitative and quantitative information, tape stripping is one of the oldest procedures for penetration studies. Although single cell layers of corneocytes are removed from the skin surface, this procedure is considered as non-invasive and is applicable exclusively to the stratum corneum. Recently, optical and spectroscopic methods have been used to investigate the penetration process. Fluorescence-labelled drugs can be easily detected in the skin by laser scanning microscopy. This method has the disadvantage that the dye labelling changes the molecular structures of the drug and consequently might influence the penetration properties. The penetration process of non-fluorescent substances can be analysed by Raman spectroscopy, electron paramagnetic resonance, CARS and multiphoton microscopic measurements. Using these methods, the concentration of the topically applied formulations in different depths of the stratum corneum can be detected by moving the laser focus from the skin surface deeper into the stratum corneum. The advantages and disadvantages of these methods will be discussed in this article.
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Affiliation(s)
- J Lademann
- Department of Dermatology, Venerology and Allergology, Center of Experimental and Applied Cutaneous Physiology-CCP, Charité-Universitätsmedizin Berlin, Charitéplatz 1, 10117 Berlin, Germany
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14
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Strese H, Kuck M, Benken R, Fluhr JW, Schanzer S, Richter H, Meinke MC, Beuthan J, Benderoth C, Frankowski G, Sterry W, Lademann J. Influence of finishing textile materials on the reduction of skin irritations. Skin Res Technol 2012; 19:e409-16. [PMID: 22694170 DOI: 10.1111/j.1600-0846.2012.00658.x] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 04/26/2012] [Indexed: 01/24/2023]
Abstract
BACKGROUND An increasing number of people is reported to have sensitive skin. Consequently, the development of textile materials with comfortable wearing properties has become a major interest. One method to create a pleasant sensation of textile materials on the skin is to coat them with silk proteins. This technologically complex procedure requires both optimization and control. METHODS The present study was aimed to characterize the subjective perception of different textiles and to objectively assess their influence on skin morphology with non-invasive optical techniques like optical coherence tomography (OCT), laser scanning microscopy (LSM) and optical surface profilometry (OP). Furthermore, optical methods were used to characterize surface properties of different textile fabrics. RESULTS In the present study it could be shown that optical non-invasive methods, as applied in cosmetology and dermatology are suited to characterize the structural properties of fabrics and the effects that textile materials have on the skin. Here, both unfinished textile materials and fabrics finished with silk protein coating were investigated by OCT, LSM and OP. In addition, volunteers were interviewed about their subjective sensation when these fabrics were in contact with their skin. CONCLUSION The study showed that optical methods could be applied to compare textile materials in vitro, which permit the wearing comfort to be predicted and in vivo perception on the skin.
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Affiliation(s)
- Helene Strese
- Charité - Universitätsmedizin Berlin, Department of Dermatology, Venerology and Allergology, Center of Experimental and Applied Cutaneous Physiology, Berlin, Germany
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15
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Klang V, Schwarz JC, Lenobel B, Nadj M, Auböck J, Wolzt M, Valenta C. In vitro vs. in vivo tape stripping: validation of the porcine ear model and penetration assessment of novel sucrose stearate emulsions. Eur J Pharm Biopharm 2011; 80:604-14. [PMID: 22123494 DOI: 10.1016/j.ejpb.2011.11.009] [Citation(s) in RCA: 73] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/11/2011] [Revised: 10/11/2011] [Accepted: 11/10/2011] [Indexed: 10/15/2022]
Abstract
Porcine ear skin is frequently used as a substitute for human skin in dermatological research and is especially useful for tape stripping experiments where the penetration of active substances into the uppermost skin layers is investigated. However, certain differences between the surface properties of these skin types exist, and reports on the comparability of tape stripping data obtained in vitro using porcine ear skin and data obtained in vivo on human forearm skin are scarce. Thus, we performed comparative tape stripping experiments in which the skin penetration of curcumin and fluorescein sodium from conventional microemulsions and hydrogels was investigated. In this context, the skin penetration potential of novel semi-solid macroemulsions and fluid nanoemulsions based on sucrose stearate was evaluated as well. The removed corneocytes were quantified by NIR-densitometry using recent correlation data for human and porcine proteins. The trends observed for the skin penetration into porcine ear skin were highly representative for the in vivo situation on human skin, confirming that the porcine ear is an excellent in vitro model for tape stripping experiments. Moreover, the validity of the NIR-densitometric approach for the quantification of both human and porcine stratum corneum proteins was confirmed in this study for the first time.
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Affiliation(s)
- Victoria Klang
- University of Vienna, Department of Pharmaceutical Technology and Biopharmaceutics, Faculty of Life Sciences, Vienna, Austria.
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