Name: an in vitro skin irritation test (sit) using the epiderm reconstructed human epidermal (rhe) model
Uploaded: 2009-07-13T21:00:00.000+00:00
Duration: 21 min 16 s
Description: Watch this Scientific Journal Video about An In Vitro Skin Irritation Test SIT using the EpiDerm Reconstructed Human Epidermal RHE Model at JoVE.com

המחברים מבקשים להודות ל ZEBET בבית BFR (גרמניה), BASF SE (גרמניה), IIVS בע&quot;מ (ארה&quot;ב), מחנה הריכוז-LSL (אוסטריה) להשתתפות במחקר בינלאומי רב מרכזי אימות של EpiDerm השתנה SIT (5 ).

<ol>
	<li>Kand&#225;rov&#225;, H., Liebsch, M., Genschow, E., Gerner, I. n. g. r. i. d., Traue, D., Slawik, B., Spielmann, H. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Optimization+of+the+EpiDerm+Test+Protocol+for+the+upcoming+ECVAM+Validation+Study+on+In+Vitro+Skin+Irritation+Tests.">Optimization of the EpiDerm Test Protocol for the upcoming ECVAM Validation Study on In Vitro Skin Irritation Tests.</a> ALTEX. 21, 107-114 (2004).</li><li>Kand&#225;rov&#225;, H., Liebsch, M., Gerner, I., Schmidt, E., Genschow, E., Traue, D., Spielmann, H. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=EpiDerm+Skin+Irritation+Test+Protocol+-+Assessment+of+the+performance+of+the+optimized+test.">EpiDerm Skin Irritation Test Protocol - Assessment of the performance of the optimized test.</a> ATLA. 33, 351-367 (2005).</li><li>Kand&#225;rov&#225;, H., Hayden, P., Klausner, M., Kubilus, J., Kearney, P., Sheasgreen, J. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=In+Vitro+Skin+Irritation+Test:+Improving+the+Sensitivity+of+the+EpiDerm+Skin+Irritation+Test+Protocol.Accepted+for+publication.">In Vitro Skin Irritation Test: Improving the Sensitivity of the EpiDerm Skin Irritation Test Protocol.Accepted for publication.</a> ATLA. , (2009).</li><li>Spielmann, H., Hoffmann, S., Liebsch, M., Botham, P., Fentem, J., Eskes, C., Roguet, R., Cotovi, J., Cole, T., Worth, A., Heylings, J., Jones, P., Robles, C., Kand&#225;rov&#225;, H. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=The+ECVAM+International+Validation+Study+on+In+Vitro+Tests+for+Acute+Skin+Irritation:+Report+on+the+Validity+of+the+EPISKIN+and+EpiDerm+Assays+and+on+the+Skin+Integrity+Function+Test.">The ECVAM International Validation Study on In Vitro Tests for Acute Skin Irritation: Report on the Validity of the EPISKIN and EpiDerm Assays and on the Skin Integrity Function Test.</a> ATLA. 35, 559-601 (2007).</li><li>Liebsch, M., Gamer, A., Curren, R., Frank, J., Genschow, E., Tharmann, J., Remmele, M., Bauer, B., Raabe, H., Barnes, N., Hilberer, A., Wilt, N., Lornejad-Sch&#228;fer, M. R., Sch&#228;fer, C., Spiller, E., Hayden, P., Kand&#225;rov&#225;, H. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Follow-up+validation+of+the+modified+EpiDerm+Skin+Irritation+Test+(SIT):+results+of+a+multicentre+study+of+twenty+reference+test+substances.">Follow-up validation of the modified EpiDerm Skin Irritation Test (SIT): results of a multicentre study of twenty reference test substances.</a> , (2008).</li><li>United Nations. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=.">.</a> Globally Harmonized System of Classification and Labeling of Chemicals (GHS). , (2007).</li><li>ESAC. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=.">.</a> Statement on the Scientific Validity of In-Vitro Tests for Skin Irritation Testing. , (2008).</li><li>Gupta, K., Rispin, A., Stitzel, K., Coecke, S., Harbell, J. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Ensuring+quality+of+in+vitro+alternative+test+methods:+Issues+and+answers.">Ensuring quality of in vitro alternative test methods: Issues and answers.</a> Regul Toxicol Pharmacol. 43, 219-224 (2005).</li><li>Rispin, A., Stitzel, K., Harbell, J., Klausner, M. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Ensuring+quality+of+in+vitro+alternative+test+methods:+Current+practice.">Ensuring quality of in vitro alternative test methods: Current practice.</a> Regul Toxicol Pharmacol. 45, 97-103 (2006).</li></ol>

The authors are employees of MatTek corporation which produce reagents and tools used in this article.

בסרטון הזה, אנחנו הדגימו את גירוי בעור EpiDerm הבדיקה (EpiDerm SIT) פיתחו ומאומתים עבור בדיקות עור במבחנה גירוי של כימיקלים, כולל מרכיבים קוסמטיים ותרופות. בעת ביצוע בשיטה זו, חשוב לעבוד בתנאים היגיינית להקפיד לעקוב אחר פרוטוקול תוקף, שכן סטייה בפרוטוקול עלול לגרום לתוצאות שונות. כמה שינויים של assay אפשריים, לעומת זאת, שינויים בפרוטוקול יש לדון ישירות עם המחברים. המגבלה היחידה של שיטה זו היא התערבות אפשרית של החומר למבחן עם הקצה MTT. חומר הבדיקה בצבע אחד או ישירות מפחית MTT (ובכך מחקה פעילות dehydrogenase של המיטוכונדריה הסלולר) עלולים להפריע הקצה MTT. עם זאת, אלה חומר הבדיקה הם בעיה רק ​​אם בעת הבדיקה MTT (כלומר 42 שעות לאחר החשיפה לחומר המבחן) כמות מספקת של חומר הבדיקה עדיין קיימות על (או) ברקמות. במקרה של אירוע זה סביר, הפחתת (נכון) MTT מטבוליות את התרומה על ידי חומר בדיקה או בצבע (שקר) הפחתה MTT ישירה של החומר למבחן ניתן לכמת באמצעות הליך תיאר בפרוטרוט את סדר assay תקן מבצע המסופקים על ידי MatTek קורפ

an in vitro skin irritation test (sit) using the epiderm reconstructed human epidermal (rhe) model

גירוי בעור EpiDerm הבדיקה (EpiDerm SIT) פותחה<sup&gt; (1,2,3)</sup&gt; ומאומתים<sup&gt; (4,5)</sup&gt; עבור<em&gt; במבחנה</em&gt; גירוי בעור בדיקות של כימיקלים, כולל מרכיבים קוסמטיים ותרופות. SIT EpiDerm מנצל את 3D<em&gt; במבחנה</em&gt; אדם משוחזר אפידרמיס (RHE) EpiDerm מודל. ההליך המתואר פרוטוקול זה מאפשר אפליה בין המגרים של קטגוריה 2 GHS ולא מגרים<sup&gt; (6)</sup&gt;. הבדיקה מבוצעת במהלך תקופת זמן 4 יום, בהיקף של דגירה מראש, 60 דקות חשיפה, 42 שעות ביממה שלאחר הדגירה ואת הכדאיות assay MTT. לאחר קבלת רקמות הדגירה מראש הלילה (יום 0), רקמות נחשפים מקומי כדי לבדוק את הכימיקלים (יום 1), אשר יכול להיות נוזל, חצי מוצקים, מוצקים או שעווה. שלוש רקמות משמשים כימיים כל מבחן, כמו גם שליטה חיובית (5% aq. פתרון SDS), וכן שליטה שלילית (DPBS). חשיפה כימית נמשך 60 דקות, 35 דקות של הרקמות אשר נשמרים באינקובטור ב 37 ° C. חומרים המבחן יוסרו מכן על ידי הליך כביסה נרחבים מפני השטח רקמות. מוסיף הרקמה הם מחק והועברו בינוני טרי. לאחר תקופת דגירה 24 שעות (יום 2), המדיום הוא החליף. המדיום ניתן לשמור לניתוח נוסף של ציטוקינים או נקודות הקצה השני של עניין. לאחר חילופי בינוני, רקמות מודגרת עבור 18 שעות נוספות. בסוף 42h כולו שלאחר הדגירה (יום 3), רקמות מועברים לתוך פתרון MTT צהוב מודגרות במשך 3 שעות. מלח כתוצאה סגול כחול formazan, נוצר בעיקר על ידי מטבוליזם המיטוכונדריה, מופק עבור 2 שעות באמצעות isopropanol. צפיפות אופטית של formazan המחולץ נקבעת באמצעות ספקטרופוטומטר. כימי מוגדר כאזור מגרים אם את הכדאיות היחסית רקמות לרקמות בקרה שלילית טיפול מופחת מתחת 50%. הליך זה יכול לשמש כתחליף מלא של במבחן vivo גירוי בעור ארנב לזיהוי סיכון וסימון של כימיקלים בקנה אחד עם תקנות האיחוד האירופי<sup&gt; (7)</sup&gt;.

Watch this Scientific Journal Video about An In Vitro Skin Irritation Test SIT using the EpiDerm Reconstructed Human Epidermal RHE Model at JoVE.com

An In Vitro Skin Irritation Test SIT using the EpiDerm Reconstructed Human Epidermal RHE Model

בסרטון הזה, אנחנו מדגימים את גירוי בעור EpiDerm הבדיקה (EpiDerm SIT) פיתחו ומאומתים עבור<em&gt; במבחנה</em&gt; גירוי בעור בדיקות של כימיקלים, כולל מרכיבים קוסמטיים ותרופות.

במבחנה גירוי בעור מבחן (SIT) באמצעות EpiDerm שחזור האדם עוריות (RHE) דגם

The EpiDerm Skin Irritation test (EpiDerm SIT) was developed (1,2,3) and validated (4,5) for in vitro skin irritation testing of chemicals, including ...

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Research

JoVE Journal

Biology

An In Vitro Skin Irritation Test (SIT) using the EpiDerm Reconstructed Human Epidermal (RHE) Model

67.6K Views.  MatTek Corporation.  日本語 

Video: An In Vitro Skin Irritation Test SIT using the EpiDerm Reconstructed Human Epidermal RHE Model

The Three-Dimensional Human Skin Reconstruct Model: a Tool to Study Normal  Skin and Melanoma Progression

Most in vitro studies in experimental skin biology have been done in 2-dimensional (2D) monocultures, while accumulating evidence suggests that cells behave differently when they are grown within a 3D extra-cellular matrix and also interact with other cells (1-5). Mouse models have been broadly utilized to study tissue morphogenesis in vivo. However mouse and human skin have significant differences in cellular architecture and physiology, which makes it difficult to extrapolate mouse studies to humans. Since melanocytes in mouse skin are mostly localized in hair follicles, they have distinct biological properties from those of humans, which locate primarily at the basal layer of the epidermis. The recent development of 3D human skin reconstruct models has enabled the field to investigate cell-matrix and cell-cell interactions between different cell types. The reconstructs consist of a "dermis" with fibroblasts embedded in a collagen I matrix, an "epidermis", which is comprised of stratified, differentiated keratinocytes and a functional basement membrane, which separates epidermis from dermis. Collagen provides scaffolding, nutrient delivery, and potential for cell-to-cell interaction. The 3D skin models incorporating melanocytic cells recapitulate natural features of melanocyte homeostasis and melanoma progression in human skin. As in vivo, melanocytes in reconstructed skin are localized at the basement membrane interspersed with basal layer keratinocytes. Melanoma cells exhibit the same characteristics reflecting the original tumor stage (RGP, VGP and metastatic melanoma cells) in vivo. Recently, dermal stem cells have been identified in the human dermis (6). These multi-potent stem cells can migrate to the epidermis and differentiate to melanocytes.

In this report, we describe the three-dimensional skin reconstruct model which mimics human skin in architecture and composition. Melanocyte physiology, melanoma progression and the fate of dermal stem cells have been investigated using the skin reconstruct model. The model is also useful as a preclinical tool for drug assessment.

עור תלת ממדי האדם לשחזר דגם: ככלי מחקר עור רגיל התקדמות מלנומה

Most in vitro studies in experimental skin biology have been done in 2-dimensional (2D) monocultures, while accumulating evidence suggests that cells ...

Bioengineering

Generation of a Three-dimensional Full Thickness Skin Equivalent and Automated Wounding

In vitro models are a cost effective and ethical alternative to study cutaneous wound healing processes. Moreover, by using human cells, these models reflect the human wound situation better than animal models. Although two-dimensional models are widely used to investigate processes such as cellular migration and proliferation, models that are more complex are required to gain a deeper knowledge about wound healing. Besides a suitable model system, the generation of precise and reproducible wounds is crucial to ensure comparable results between different test runs. In this study, the generation of a three-dimensional full thickness skin equivalent to study wound healing is shown. The dermal part of the models is comprised of human dermal fibroblast embedded in a rat-tail collagen type I hydrogel. Following the inoculation with human epidermal keratinocytes and consequent culture at the air-liquid interface, a multilayered epidermis is formed on top of the models. To study the wound healing process, we additionally developed an automated wounding device, which generates standardized wounds in a sterile atmosphere.

The goal of this protocol is to build up a three-dimensional full thickness skin equivalent, which resembles natural skin. With a specifically constructed automated wounding device, precise and reproducible wounds can be generated under maintenance of sterility.

דור של עור בעובי מלא תלת ממדי Equivalent ואוטומטי פציעה

In vitro models are a cost effective and ethical alternative to study cutaneous wound healing processes. Moreover, by using human cells, these models ...

Eye Irritation Test (EIT) for Hazard Identification of Eye Irritating Chemicals using Reconstructed Human Cornea-like Epithelial (RhCE) Tissue Model

To comply with the Seventh Amendment to the EU Cosmetics Directive and EU REACH legislation, validated non-animal alternative methods for reliable and accurate assessment of ocular toxicity in man are needed. To address this need, we have developed an eye irritation test (EIT) which utilizes a three dimensional reconstructed human cornea-like epithelial (RhCE) tissue model that is based on normal human cells. The EIT is able to separate ocular&#160;irritants and corrosives (GHS Categories 1 and 2 combined) and those that do not require labeling (GHS No Category). The test utilizes two separate protocols, one designed for liquid chemicals and a second, similar protocol for solid test articles. The EIT prediction model uses a single exposure period (30 min for liquids, 6 hr for solids) and a single tissue viability cut-off (60.0% as determined by the MTT assay). Based on the results for 83 chemicals (44 liquids and 39 solids) EIT achieved 95.5/68.2/ and 81.8% sensitivity/specificity and accuracy (SS&#38;A) for liquids, 100.0/68.4/ and 84.6% SS&#38;A for solids, and 97.6/68.3/ and 83.1% for overall SS&#38;A. The EIT will contribute significantly to classifying the ocular irritation potential of a wide range of liquid and solid chemicals without the use of animals to meet regulatory testing requirements. The EpiOcular EIT method was implemented in 2015 into the OECD Test Guidelines as TG 492.

Eye Irritation Test EIT for Hazard Identification of Eye Irritating Chemicals using Reconstructed Human Cornea-like Epithelial RhCE Tissue Model

We have developed an eye irritation test which utilizes a three dimensional reconstructed human cornea-like epithelial (RhCE) tissue model. The test is able to discriminate between ocular irritant and corrosive materials (GHS Categories 1 and 2 combined) and those that do not require labeling (GHS No Category).

גירוי מבחן העין (EIT) לסיכוני זיהוי כימיקלים עיניים מעצבנים באמצעות אפיתל דגם רקמות כמו-קרנית משוחזר אדם (RHCE)

To comply with the Seventh Amendment to the EU Cosmetics Directive and EU REACH legislation, validated non-animal alternative methods for reliable and ...

Improving 2D and 3D Skin In Vitro Models Using Macromolecular Crowding

The glycoprotein family of collagens represents the main structural proteins in the human body, and are key components of biomaterials used in modern tissue engineering. A technical bottleneck is the deposition of collagen in vitro, as it is notoriously slow, resulting in sub-optimal formation of connective tissue and subsequent tissue cohesion, particularly in skin models. Here, we describe a method which involves the addition of differentially-sized sucrose co-polymers to skin cultures to generate macromolecular crowding (MMC), which results in a dramatic enhancement of collagen deposition. Particularly, dermal fibroblasts deposited a significant amount of collagen I/IV/VII and fibronectin under MMC in comparison to controls.
The protocol also describes a method to decellularize crowded cell layers, exposing significant amounts of extracellular matrix (ECM) which were retained on the culture surface as evidenced by immunocytochemistry. Total matrix mass and distribution pattern was studied using interference reflection microscopy. Interestingly, fibroblasts, keratinocytes and co-cultures produced cell-derived matrices (CDM) of varying composition and morphology. CDM could be used as &#34;bio-scaffolds&#34; for secondary cell seeding, where the current use of coatings or scaffolds, typically from xenogenic animal sources, can be avoided, thus moving towards more clinically relevant applications.
In addition, this protocol describes the application of MMC during the submerged phase of a 3D-organotypic skin co-culture model which was sufficient to enhance ECM deposition in the dermo-epidermal junction (DEJ), in particular, collagen VII, the major component of anchoring fibrils. Electron microscopy confirmed the presence of anchoring fibrils in cultures developed with MMC, as compared to controls. This is significant as anchoring fibrils tether the dermis to the epidermis, hence, having a pre-formed mature DEJ may benefit skin graft recipients in terms of graft stability and overall wound healing. Furthermore, culture time was condensed from 5 weeks to 3 weeks to obtain a mature construct, when using MMC, reducing costs.

Improving 2D and 3D Skin In Vitro Models Using Macromolecular Crowding

We present a protocol to obtain cell-derived matrices rich in extracellular matrix proteins, using macromolecular crowders (MMC). In addition, we present a protocol which incorporates MMC in 3D organotypic skin co-culture generation, which reduces culture time while maintaining maturity of construct.

עור 2D and 3D שיפור<em&gt; במבחנה</em&gt; מודלים שימוש להצטופפות מולקולארית

The glycoprotein family of collagens represents the main structural proteins in the human body, and are key components of biomaterials used in modern ...

Human Ex vivo Wound Model and Whole-Mount Staining Approach to Accurately Evaluate Skin Repair

Chronic non-healing wounds, which primarily affect the elderly and diabetic, are a significant area of clinical unmet need. Unfortunately, current chronic wound treatments are inadequate, while available pre-clinical models poorly predict the clinical efficacy of new therapies. Here we describe a high throughput, pre-clinical model to assess multiple aspects of the human skin repair response. Partial thickness wounds were created in human ex vivo skin and cultured across a healing time course. Skin wound biopsies were collected in fixative for the whole-mount staining procedure. Fixed samples were blocked and incubated in primary antibody, with detection achieved via fluorescently conjugated secondary antibody. Wounds were counterstained and imaged via confocal microscopy before calculating percentage wound closure (re-epithelialization) in each biopsy. Applying this protocol, we reveal that 2 mm excisional wounds created in healthy donor skin are fully re-epithelialized by day 4-5 post-wounding. On the contrary, closure rates of diabetic skin wounds are significantly reduced, accompanied by perturbed barrier reformation. Combining human skin wounding with a novel whole-mount staining approach allows a rapid and reproducible method to quantify ex vivo wound repair. Collectively, this protocol provides a valuable human platform to evaluate the effectiveness of potential wound therapies, transforming pre-clinical testing and validation.

Here we demonstrate an optimized technique for assessing wound repair using ex vivo human skin combined with a whole-mount staining approach. This methodology provides a pre-clinical platform for the evaluation of potential wound therapies.

מודל פצע Ex vivo אנושי וגישה מוכתמת בהר שלם להערכה מדויקת של תיקון העור

Chronic non-healing wounds, which primarily affect the elderly and diabetic, are a significant area of clinical unmet need. Unfortunately, current chronic ...

Developmental Biology

Cultivating a Three-dimensional Reconstructed Human Epidermis at a Large Scale

A three-dimensional human epidermis model reconstructed from neonatal primary keratinocytes is presented. Herein, a protocol for the cultivation process and the characterization of the model is described. Neonatal primary keratinocytes are grown submerged on permeable polycarbonate inserts and lifted to the air-liquid interface three days after seeding. After fourteen days of stimulation with defined growth factors and ascorbic acid in high calcium culture medium, the model is fully differentiated. Histological analysis revealed a completely stratified epidermis, mimicking the morphology of native human skin. To characterize the model and its barrier functions, protein levels and localization specific for early-stage keratinocyte differentiation (i.e., keratin 10), late-stage differentiation (i.e., involucrin, loricrin, and filaggrin) and tissue adhesion (i.e., desmoglein 1), were assessed by immunofluorescence. The tissue barrier integrity was further evaluated by measuring transepithelial electrical resistance. Reconstructed human epidermis was responsive to proinflammatory stimuli (i.e., lipopolysaccharide and tumor necrosis factor alpha), leading to increased cytokine release (i.e., interleukin 1 alpha and interleukin 8). This protocol represents a straightforward and reproducible in vitro method to cultivate reconstructed human epidermis as a tool to assess environmental effects and a broad range of skin-related studies.

This protocol describes a straightforward method to cultivate three-dimensional reconstituted human epidermis in a reproducible and robust manner. Additionally, it characterizes the structure-function relationship of the epidermal barrier model. The biological responses of the reconstituted human epidermis upon proinflammatory stimuli are also presented.

טיפוח אפידרמיס אנושי תלת מימדי משוחזר בקנה מידה גדול

A three-dimensional human epidermis model reconstructed from neonatal primary keratinocytes is presented. Herein, a protocol for the cultivation process ...

Generation of Self-assembled Vascularized Human Skin Equivalents

Human skin equivalents (HSEs) are tissue engineered constructs that model epidermal and dermal components of human skin. These models have been used to study skin development, wound healing, and grafting techniques. Many HSEs continue to lack vasculature and are additionally analyzed through post-culture histological sectioning which limits volumetric assessment of the structure. Presented here is a straightforward protocol utilizing accessible materials to generate vascularized human skin equivalents (VHSE); further described are volumetric imaging and quantification techniques of these constructs. Briefly, VHSEs are constructed in 12 well culture inserts in which dermal and epidermal cells are seeded into rat tail collagen type I gel. The dermal compartment is made up of fibroblast and endothelial cells dispersed throughout collagen gel. The epidermal compartment is made up of keratinocytes (skin epithelial cells) that differentiate at the air-liquid interface. Importantly, these methods are customizable based on needs of the researcher, with results demonstrating VHSE generation with two different fibroblast cell types: human dermal fibroblasts (hDF) and human lung fibroblasts (IMR90s). VHSEs were developed, imaged through confocal microscopy, and volumetrically analyzed using computational software at 4- and 8-week timepoints. An optimized process to fix, stain, image, and clear VHSEs for volumetric examination is described. This comprehensive model, imaging, and analysis techniques are readily customizable to the specific research needs of individual labs with or without prior HSE experience.

The goal of this protocol is to describe the generation and volumetric analysis of vascularized human skin equivalents using accessible and simple techniques for long term culture. To the extent possible, the rationale for steps is described to allow researchers the ability to customize based on their research needs.

דור של שווה ערך לעור אנושי בהרכבה עצמית

Human skin equivalents (HSEs) are tissue engineered constructs that model epidermal and dermal components of human skin. These models have been used to ...

Generation of a Simplified Three-Dimensional Skin-on-a-chip Model in a Micromachined Microfluidic Platform

This work presents a new, cost-effective, and reliable microfluidic platform with the potential to generate complex multilayered tissues. As a proof of concept, a simplified and undifferentiated human skin containing a dermal (stromal) and an epidermal (epithelial) compartment has been modelled. To accomplish this, a versatile and robust, vinyl-based device divided into two chambers has been developed, overcoming some of the drawbacks present in microfluidic devices based on polydimethylsiloxane (PDMS) for biomedical applications, such as the use of expensive and specialized equipment or the absorption of small, hydrophobic molecules and proteins. Moreover, a new method based on parallel flow was developed, enabling the in situ deposition of both the dermal and epidermal compartments. The skin construct consists of a fibrin matrix containing human primary fibroblasts and a monolayer of immortalized keratinocytes seeded on top, which is subsequently maintained under dynamic culture conditions. This new microfluidic platform opens the possibility to model human skin diseases and extrapolate the method to generate other complex tissues.

Here, we present a protocol to generate a three-dimensional simplified and undifferentiated skin model using a micromachined microfluidic platform. A parallel flow approach allows the in situ deposition of a dermal compartment for the seeding of epithelial cells on top, all controlled by syringe pumps.

יצירת דגם תלת מימדי תלת מימדי של עור על שבב בפלטפורמה מיקרופלואידית מיקרו-מכונות

This work presents a new, cost-effective, and reliable microfluidic platform with the potential to generate complex multilayered tissues. As a proof of ...

<meta charset="utf8"></head><body>מודלים תלת-ממדיים יעילים לעיצוב עור ליישום מחקר גמיש

Building Up Skin Models for Numerous Applications - from Two-Dimensional (2D) Monoculture to Three-Dimensional (3D) Multiculture

Due to the complex structure and important functions of the skin, it is an interesting research model for the cosmetic, pharmaceutical, and medical industries. In the European Union, there has been a total ban on testing cosmetic products and their ingredients on animals. In the case of medicine and pharmaceuticals, this possibility is also constantly limited. In accordance with the 3Rs principle, it is becoming more and more common to test individual compounds as well as entire formulations on artificially created models. The cheapest and most widely used are the 2D models, which consist of a cell monolayer but do not reflect the real interactions between the cells in the tissue. Although the commercially available 3D models provide a better representation of the tissue, they are not used on a large scale. This is because they are expensive, the waiting time is quite long, and the available models are frequently limited to only those typically used. 
In order to move the conducted research to a higher level, we have optimized the procedures of various 3D skin model preparations. The described procedures are cheap and simple to prepare as they can be applied in numerous laboratories and by researchers with different experiences in cell culture.

<meta charset="utf8"></head><body>מחבר זרקור: שיפור מגוון דגמי העור באמצעות מודלים סלולריים תלת-ממדיים חסכוניים

Here, we present inexpensive and simple procedures to introduce various 3D skin models for routine research in a cell culture laboratory. Researchers can create models tailored to their needs without relying on commercially available models.

בניית מודלים לעור עבור יישומים רבים - החל ממונוקולטורה דו-ממדית (2D) ועד רב-תרבותיות תלת-ממדית (3D)

Due to the complex structure and important functions of the skin, it is an interesting research model for the cosmetic, pharmaceutical, and medical ...

במבחנה גירוי בעור מבחן (SIT) באמצעות EpiDerm שחזור האדם עוריות (RHE) דגם

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עור תלת ממדי האדם לשחזר דגם: ככלי מחקר עור רגיל התקדמות מלנומה

דור של עור בעובי מלא תלת ממדי Equivalent ואוטומטי פציעה

גירוי מבחן העין (EIT) לסיכוני זיהוי כימיקלים עיניים מעצבנים באמצעות אפיתל דגם רקמות כמו-קרנית משוחזר אדם (RHCE)

עור 2D and 3D שיפור

מודל פצע Ex vivo אנושי וגישה מוכתמת בהר שלם להערכה מדויקת של תיקון העור

טיפוח אפידרמיס אנושי תלת מימדי משוחזר בקנה מידה גדול

דור של שווה ערך לעור אנושי בהרכבה עצמית

יצירת דגם תלת מימדי תלת מימדי של עור על שבב בפלטפורמה מיקרופלואידית מיקרו-מכונות

בניית מודלים לעור עבור יישומים רבים - החל ממונוקולטורה דו-ממדית (2D) ועד רב-תרבותיות תלת-ממדית (3D)

בניית מודלים לעור עבור יישומים רבים - החל ממונוקולטורה דו-ממדית (2D) ועד רב-תרבותיות תלת-ממדית (3D)