Biz onların yardım ve teknik destek için İşbirlikçi Bilim, NYUMC Mikroskopisi Core Ofisi&#39;nde Kong Lab ve Dr Yan Deng tüm üyelerine teşekkür etmek istiyorum. Bu çalışma AIDS Araştırma için New York Üniversitesi Merkezi (CFAR, NIH hibe AI027742) adlı bir pilot hibe ile desteklenmiştir.

1. Plazmid DNA Saflaştırma <ol><li> DH5α E.coli yetkili hücrelere ökaryotik plazmid DNA kodlaması EGFP (fK-EGFP) Transform. FK boş vektör ayrıca, bir negatif kontrol olarak da kullanılabilir. </li><li> Kültür ve hasat DH5α E.coli hücreleri ve Qiagen EndoFree Plazmid Arıtma Handbook göre pDNA arındırmak. </li><li> Filtre pDNA 0.22 mikron PVDF steril filtre ile çözüm ve kullanıma kadar -20 ° C&#39;de saklayın. </li></ol> 2. Dövme Sistem Hazırlama <ol><li> Üreticinin talimatlarına göre güç kaynağı birimi için el ünitesi ve kontrol pedalı bağlayın. </li><li> Yaklaşık 100 Hz iğne salınım frekansı ayarlayın. Biz (Stealth Rotary Dövme Sistemi) seçti dövme cihazı için, güç kaynağı üzerindeki kadranı 4 volt olarak ayarlanması gerekir. Kullanım kılavuzu veya diğer dövme sistemleri için teknik desteğe başvurun. </li><li> Iğne ar sterilizeKullanmadan önce ray. Biz hayvan başına bir iğne dizisi kullanmanızı öneririz. Iğneler sabunlu su ile temizlenmeli ve otoklav edildikten sonra tekrar kullanılabilir. </li><li> El ünitesi içine iğne dizi takın ve gevşek plastik kavrama takın. </li><li> Yukarı veya aşağı plastik kavrama hareket ettirerek uygun bir ayara iğne derinliğini ayarlayın. Biz fare deney için, yaklaşık 0.5 mm bir derinlik iğne kullanılmaktadır. </li><li> Iğne derinliği doğru ayarlanmış olduğundan plastik kavrama sıkın ve dövme sistem kullanıma hazırdır. </li></ol> 3. Hayvan Tıraş <ol><li> Dövme tedavisinde sitesi seçin. Site, nispeten sert, düz ve etli deri alanı, örneğin, hayvanın hindleg yan olmalıdır. </li><li> Hayvanın vücut ağırlığına göre ketamin (90 mg / kg) ve ksilazin (5 mg / kg) oluşan bir karışım ile bir BALB / C fare anestetize. Diğer hayvanlar için, kurumun anestezi yönergelere bakın. </li><li> Girişhayvan onaylamak için onun ayak kısma hayvanın refleksleri düzgün anestezi olduğunu. </li><li> Yavaş ve dikkatli hayvanın hindlegs de saç kesmek için elektrik düzeltici kullanın. Planlanan dövme site ve çevredeki saç çıkarın. </li><li> Tek permatik ile rezidüel kısa saç çıkarın. Hayvanın deri kesmek için dikkatli olun. Tüy dökücü krem, alternatif bir saç giderme yöntemi olarak kullanılabilir dikkat ediniz; ancak, tüy dökücü krem ​​üzerine tıraş tercih ederim. </li><li> Basınçlı hava Gerekirse deriden sokak kesim tüyleri temizleyin. </li></ol> 4. Dövme ile Plazmid DNA Teslim <ol><li> , Bir aşılama protokol daha önce belirlenmiş olması durumunda, doz ve uygulanacak olan DNA çözelti hacminin buna göre hesaplanır. Biz dövme işlemi daha kolay yönetilebilir hale getirmek için pratik olduğu kadar küçük bir birim olarak kullanmanızı öneririz. Bu EGFP gösteri, biz con de DNA çözeltisi 7.5 ul kullanılıryaklaşık 1 cm 2 lik bir alan üzerine tatbik dövme 0.25 mg / ml, ve konsantrasyon. Aşılama deneyleri için, daha yüksek konsantrasyonlarda kuvvetli pDNA bağışıklık yanıtlarını 1,2 indüklemek için gerekli olabilir. </li><li> Dövme sitede doğrudan pipetleme DNA solüsyonu uygulayın. Alternatif olarak, pipetleme ile plastik kavrama içine DNA çözelti yük, yani sıvı iğne ve plastik kavrama ucu arasında bekletilir. Bir gösteri için video bakın. Biz iki yöntem arasında hissedilir bir fark gözlemledim. Bununla birlikte, plastik kavrama içine çözelti yükleme, örneğin dikey deri yüzeyleri üzerinde avantajlı olabilir. </li><li> İğne salınım başlatın ve dövme yerinde hayvanın cilt üzerinde hafif basınç ile iğne dizi yerleştirir. Sonra tüm dövme alana plazmid DNA teslim etmek için lineer bir şekilde ve yavaşça titreşen iğne hareket ettirin. İğne ve önlemek için cilt arasındaki 90 derecelik açı koruyuncilt yaralanmalarını. </li><li> Cilt gözlemleyin. Aşınma ve inflamasyon normaldir. Kanama olursa, dövme işlemi durdurmak ve iğne derinliğini azaltmak. </li><li> Yaklaşık 1 dk için iğne hareketi devam edilmesi ve daha sonra dövme işlemi durdurun. </li><li> Dövme sitede topikal analjezik ince bir tabaka uygulamak için temiz bir pamuklu bez kullanın. Böyle Silver Sulfadiazine Krem (SSD Krem) veya Neosporin merhem gibi Topikal analjezik hayvanların ağrı veya sıkıntı hafifletmeye yardımcı olabilir ve bu nedenle anestezi kapalı giyer önce bunları uygulamak için tavsiye edilir. Ağrı veya sıkıntı (yürüme, hareketsizlik değişim) belirtileri için ertesi gün hayvanları gözlemleyin. Belirtileri devam ederse analjezik krem ​​yeniden uygulayın. </li></ol> 5. Antijen İfade Onayı <ol><li> Dövme tedavisi (farklı pDNA yapıları farklı anlatım kez gerektirdiğini unutmayın) sonra 48 saat, fare CO 2 narkoz tarafından ötenazi edilir. Diğer içinhayvanlar, kurumunuzun ötanazi yönergelere bakın. </li><li> Dövme sahada deri teşrih ve 4 ° C&#39;da gece boyunca% 4 paraformaldehit içinde doku düzeltmek. </li><li> % 70 etanol ile doku durulayın ve görüntüleme için 1X PBS içine aktarın. </li><li> EGFP sinyalleri kontrol etmek için bir konfokal mikroskop kullanarak tüm doku inceleyin. Alternatif olarak, cilt dokusu parafin içine gömülmüş ve bir floresan mikroskop altında bölümlerde incelenebilir. </li></ol>

<ol>
	<li>Bins, A. D. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=A+rapid+and+potent+DNA+vaccination+strategy+defined+by+in+vivo+monitoring+of+antigen+expression.">A rapid and potent DNA vaccination strategy defined by in vivo monitoring of antigen expression.</a> Nat Med. 11, 899-904 (2005).</li><li>Pokorna, D., Rubio, I., Muller, M. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=DNA-vaccination+via+tattooing+induces+stronger+humoral+and+cellular+immune+responses+than+intramuscular+delivery+supported+by+molecular+adjuvants.">DNA-vaccination via tattooing induces stronger humoral and cellular immune responses than intramuscular delivery supported by molecular adjuvants.</a> Genet. Vaccines Ther. 6, 4 (2008).</li><li>van den Berg, J. 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+intradermal+vaccination+by+DNA+tattooing+in+human+skin.">Optimization of intradermal vaccination by DNA tattooing in human skin.</a> Hum. Gene Ther. 20, 181-189 (2009).</li><li>Liu, M. A. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=DNA+vaccines:+a+review.">DNA vaccines: a review.</a> J. Intern. Med. 253, 402-410 (2003).</li><li>Koide, Y., Nagata, T., Yoshida, A., Uchijima, M. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=DNA+vaccines.">DNA vaccines.</a> Jpn. J. Pharmacol. 83, 167-174 (2000).</li><li>Peachman, K. K., Rao, M., Alving, C. R. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Immunization+with+DNA+through+the+skin.">Immunization with DNA through the skin.</a> Methods. 31, 232-242 (2003).</li><li>Verstrepen, B. E. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Improved+HIV-1+specific+T-cell+responses+by+short-interval+DNA+tattooing+as+compared+to+intramuscular+immunization+in+non-human+primates.">Improved HIV-1 specific T-cell responses by short-interval DNA tattooing as compared to intramuscular immunization in non-human primates.</a> Vaccine. 26, 3346-3351 (2008).</li><li>Potthoff, A. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Immunogenicity+and+efficacy+of+intradermal+tattoo+immunization+with+adenoviral+vector+vaccines.">Immunogenicity and efficacy of intradermal tattoo immunization with adenoviral vector vaccines.</a> Vaccine. 27, 2768-2774 (2009).</li><li>Quaak, S. G. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=DNA+tattoo+vaccination:+effect+on+plasmid+purity+and+transfection+efficiency+of+different+topoisoforms.">DNA tattoo vaccination: effect on plasmid purity and transfection efficiency of different topoisoforms.</a> J. Control Release. 139, 153-159 (2009).</li><li>Pokorna, D. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Vaccination+with+human+papillomavirus+type+16-derived+peptides+using+a+tattoo+device.">Vaccination with human papillomavirus type 16-derived peptides using a tattoo device.</a> Vaccine. 27, 3519-3529 (2009).</li></ol>

Çıkar çatışması ilan etti.

Bunun manipülasyon gerektiren, ya canlı veya zayıflatılmış patojen 4 aşılar göstermiyor gibi DNA aşılama geleneksel aşılama stratejileri daha güvenli olarak kabul edilir. Ancak DNA aşılama sonucu teslimat güzergahı üzerinde büyük ölçüde bağlıdır. Deri gibi Langerhans Hücreleri ve dendritik hücreler 1, ve böylece immunojenite ve erişim 5,6 kolaylığı açısından bağışıklama için ideal bir site olarak antijen sunan hücreler, bol miktarda bulunur. Son...

<table border="1"><tbody><tr><td> Reaktif / Malzeme Adı </td><td> Şirket </td><td> Katalog Numarası </td><td> Yorumlar </td></tr><tr><td> fK-EGFP plazmid DNA </td><td> Clontech </td><td></td><td></td></tr><tr><td> STEALTH Rotary Dövme Sistemi </td><td> Dünya Dövme Tedarik </td><td> STEALTH-L </td><td></td></tr><tr><td> Dövme iğneleri </td><td> Dünya Dövme Tedarik </td><td> 1207RSB </td><td></td></tr><tr><td> EndoFree Plazmid Maxi Seti </td><td> Qiagen </td><td> 12362 </td><td></td></tr><tr><td> 0.22 mikron PVDF steril filtre </td><td> Millipore </td><td> SLGV013SL </td><td></td></tr><tr><td> elektrikli saç düzeltici </td><td> Ticari olarak temin edilebilen </td><td></td><td></td></tr><tr><td> tek güvenlik jilet </td><td> Ticari olarak temin edilebilen </td><td></td><td></td></tr><tr><td> GümüşSülfadiazin Krem </td><td> Watson </td><td> NDC 0591-0810-55 </td><td></td></tr><tr><td> Ketamin HCL </td><td></td><td> NDC 0856-2012-01 </td><td></td></tr><tr><td> Zylazine Steril Solüsyonu </td><td></td><td> NADA 139-236 </td><td></td></tr></tbody></table>

skin tattooing as a novel approach for dna vaccine delivery

Nükleik asit tabanlı aşılamanın artan ilgi bir konu, immünolojik önemli antijenleri kodlayan özellikle plazmid DNA (pDNA) &#39;dir. Mühendislik pDNA aşılar uygulandı sonra, transkripsiyonu ve bağışıklık sistemi tepkiler olabilir immünojen proteinler tercüme edilmiştir. DNA aşıları sunma Birçok yönden araştırılmıştır, ancak her teslimat rotayı kendi avantajları ve tuzaklar vardır. Cilt dövme, güvenli maliyet-etkin ve uygun bir roman tekniğidir. Buna ek olarak, iğne tarafından uygulanan delikler de güçlü bir yardımcı madde olarak hizmet edebilir. Burada, a) plazmid DNA kodlama intradermal teslimat göstermek gelişmiş yeşil flüoresan konfokal mikroskopi kullanılarak cilt hücrelerinde EGFP etkili ifade onaylayın dövme cihazı ve b) kullanılarak bir fare modelinde protein (fK-EGFP).

509 nm 488 nm ve emisyon zirvesinde bir uyarma zirve ile EGFP ifadesi fare deri hücreleri görülebilir. Yaklaşık 3 × içeren bir DNA 1.875 mikrogram doz, 10 Gönderen plazmid 17 kopya, biz genellikle 2 alana dövme 1 cm 10-20 EGFP sinyalleri görülmektedir. Transfekte edilmiş hücrelerin Bu, nispeten az sayıda bir önceki çalışmada, 3 sonuçları ile uyum içindedir. EGFP ifade (Şekil 1) plazmid EGFP DNA dövme tekniği kullanarak hayvanın deri hücrelerine ...

Watch this Scientific Journal Video about Skin Tattooing As A Novel Approach For DNA Vaccine Delivery at JoVE.com

Skin Tattooing As A Novel Approach For DNA Vaccine Delivery

Cilt dövme intradermal teslimat DNA aşısı için güçlü ve güvenli bir yoldur. Burada, bir DNA plazmid kodlama EGFP bir laboratuvar fare cilt dövme tarafından teslim edilir ve cilt hücrelerinde EGFP ifadesi ardından konfokal mikroskopi tarafından denetlenir.

Cilt DNA Aşı Teslim İçin Yeni Bir Yaklaşım olarak Dövme

Nucleic acid-based vaccination is a topic of growing interest, especially plasmid DNA (pDNA) encoding immunologically important antigens. After the ...

skin-tattooing-as-a-novel-approach-for-dna-vaccine-delivery

Research

JoVE Journal

Bioengineering

15.9K Görüntüleme.  New York University School of Medicine. Cilt dövme intradermal teslimat DNA aşısı için güçlü ve güvenli bir yoldur. Burada, bir DNA plazmid kodlama EGFP bir laboratuvar fare cilt dövme tarafından teslim edilir ve cilt hücrelerinde EGFP ifadesi ardından konfokal mikroskopi tarafından denetlenir.

Video: Skin Tattooing As A Novel Approach For DNA Vaccine Delivery

Cell Squeezing as a Robust, Microfluidic Intracellular Delivery Platform

Rapid mechanical deformation of cells has emerged as a promising, vector-free method for intracellular delivery of macromolecules and nanomaterials. This technology has shown potential in addressing previously challenging applications; including, delivery to primary immune cells, cell reprogramming, carbon nanotube, and quantum dot delivery. This vector-free microfluidic platform relies on mechanical disruption of the cell membrane to facilitate cytosolic delivery of the target material. Herein, we describe the detailed method of use for these microfluidic devices including, device assembly, cell preparation, and system operation. This delivery approach requires a brief optimization of device type and operating conditions for previously unreported applications. The provided instructions are generalizable to most cell types and delivery materials as this system does not require specialized buffers or chemical modification/conjugation steps. This work also provides recommendations on how to improve device performance and trouble-shoot potential issues related to clogging, low delivery efficiencies, and cell viability.

Rapid mechanical deformation of cells has emerged as a promising, vector-free method for intracellular delivery of macromolecules and nanomaterials. This protocol provides detailed steps on how to use the system for a broad range of applications.

Sağlam, mikroakışkan Hücre içi Delivery Platform olarak hücre Sıkma

Rapid mechanical deformation of cells has emerged as a promising, vector-free method for intracellular delivery of macromolecules and nanomaterials. This ...

Biyomühendislik

An Improved Method for the Preparation of Type I Collagen From Skin

Soluble type 1 collagen (COL1) is used extensively as an adhesive substrate for cell cultures and as a cellular scaffold for regenerative applications. Clinically, this protein is widely used for cosmetic surgery, dermal injections, bone grafting, and reconstructive surgery. The sources of COL1 for these procedures are commonly nonhuman, which increases the potential for inflammation and rejection as well as xenobiotic disease transmission. In view of this, a method to efficiently and quickly purify COL1 from limited quantities of autologously-derived tissues would circumvent many of these issues; however, standard isolation protocols are lengthy and often require large quantities of collagenous tissues. Here, we demonstrate an efficient COL1 extraction method that reduces the time needed to isolate and purify this protein from about 10 days to less than 3 hr. We chose the dermis as our tissue source because of its availability during many surgical procedures. This method uses traditional extraction buffers combined with forceful agitation and centrifugal filtration to obtain highly-pure, soluble COL1 from small amounts of corium. Briefly, dermal biopsies are washed thoroughly in ice-cold dH2O after removing fat, connective tissue, and hair. The skin samples are stripped of noncollagenous proteins and polysaccharides using 0.5 M sodium acetate and a high speed bench-top homogenizer. Collagen from residual solids is subsequently extracted with a 0.075 M sodium citrate buffer using the homogenizer. These extracts are purified using 100,000 MW cut-off centrifugal filters that yield COL1 preparations of comparable or superior quality to commercial products or those obtained using traditional procedures. We anticipate this method will facilitate the utilization of autologously-derived COL1 for a multitude of research and clinical applications.

Traditional procedures for the isolation of soluble type 1 collagen (COL1) require about 10 days from start to finish because of lengthy buffer incubations and laborious resuspensions of fibrils. Here, we describe a means to purify COL1 from small dermal biopsies in less than 3 hr.

Cilt Tip I Kolajen hazırlanması için geliştirilmiş bir yöntem

Soluble type 1 collagen (COL1) is used extensively as an adhesive substrate for cell cultures and as a cellular scaffold for regenerative applications. ...

Characterization of Complex Systems Using the Design of Experiments Approach: Transient Protein Expression in Tobacco as a Case Study

Plants provide multiple benefits for the production of biopharmaceuticals including low costs, scalability, and safety. Transient expression offers the additional advantage of short development and production times, but expression levels can vary significantly between batches thus giving rise to regulatory concerns in the context of good manufacturing practice. We used a design of experiments (DoE) approach to determine the impact of major factors such as regulatory elements in the expression construct, plant growth and development parameters, and the incubation conditions during expression, on the variability of expression between batches. We tested plants expressing a model anti-HIV monoclonal antibody (2G12) and a fluorescent marker protein (DsRed). We discuss the rationale for selecting certain properties of the model and identify its potential limitations. The general approach can easily be transferred to other problems because the principles of the model are broadly applicable: knowledge-based parameter selection, complexity reduction by splitting the initial problem into smaller modules, software-guided setup of optimal experiment combinations and step-wise design augmentation. Therefore, the methodology is not only useful for characterizing protein expression in plants but also for the investigation of other complex systems lacking a mechanistic description. The predictive equations describing the interconnectivity between parameters can be used to establish mechanistic models for other complex systems.

We describe a design of experiments approach that can be used to determine and model the influence of transgene regulatory elements, plant growth and development parameters, and incubation conditions on the transient expression of monoclonal antibodies and reporter proteins in plants.

Bir Vaka Çalışması Olarak Tütün Geçici Protein Expression: Deneyler Yaklaşımı Tasarım Kullanma Karmaşık Sistemler Karakterizasyonu

Plants provide multiple benefits for the production of biopharmaceuticals including low costs, scalability, and safety. Transient expression offers the ...

Microscale Vortex-assisted Electroporator for Sequential Molecular Delivery

Electroporation has received increasing attention in the past years, because it is a very powerful technique for physically introducing non-permeant exogenous molecular probes into cells. This work reports a microfluidic electroporation platform capable of performing multiple molecule delivery to mammalian cells with precise and molecular-dependent parameter control. The system&#8217;s ability to isolate cells with uniform size distribution allows for less variation in electroporation efficiency per given electric field strength; hence enhanced sample viability. Moreover, its process visualization feature allows for observation of the fluorescent molecular uptake process in real-time, which permits prompt molecular delivery parameter adjustments in situ for efficiency enhancement. To show the vast capabilities of the reported platform, macromolecules with different sizes and electrical charges (e.g., Dextran with MW of 3,000 and 70,000 Da) were delivered to metastatic breast cancer cells with high delivery efficiencies (&#62;70%) for all tested molecules. The developed platform has proven its potential for use in the expansion of research fields where on-chip electroporation techniques can be beneficial.

A microfluidic vortex assisted electroporation platform was developed for sequential delivery of multiple molecules into identical cell populations with precise and independent dosage control. The system&#8217;s size based target cell purification step preceding electroporation aided to enhance molecular delivery efficiency and processed cell viability.

Microscale Vortex destekli Sıralı Moleküler Teslimat için Electroporator

Electroporation has received increasing attention in the past years, because it is a very powerful technique for physically introducing non-permeant ...

Fabrication of a Functionalized Magnetic Bacterial Nanocellulose with Iron Oxide Nanoparticles

In this study, bacterial nanocellulose (BNC) produced by the bacteria Gluconacetobacter xylinus is synthesized and impregnated in situ with iron oxide nanoparticles (IONP) (Fe3O4) to yield a magnetic bacterial nanocellulose (MBNC). The synthesis of MBNC is a precise and specifically designed multi-step process. Briefly, bacterial nanocellulose (BNC) pellicles are formed from preserved G. xylinus strain according to our experimental requirements of size and morphology. A solution of iron(III) chloride hexahydrate (FeCl3&#183;6H2O) and iron(II) chloride tetrahydrate (FeCl2&#183;4H2O) with a 2:1 molar ratio is prepared and diluted in deoxygenated high purity water. A BNC pellicle is then introduced in the vessel with the reactants. This mixture is stirred and heated at 80 &#176;C in a silicon oil bath and ammonium hydroxide (14%) is then added by dropping to precipitate the ferrous ions into the BNC mesh. This last step allows forming in situ magnetite nanoparticles (Fe3O4) inside the bacterial nanocellulose mesh to confer magnetic properties to BNC pellicle. A toxicological assay was used to evaluate the biocompatibility of the BNC-IONP pellicle. Polyethylene glycol (PEG) was used to cover the IONPs in order to improve their biocompatibility. Scanning electron microscopy (SEM) images showed that the IONP were located preferentially in the fibril interlacing spaces of the BNC matrix, but some of them were also found along the BNC ribbons. Magnetic force microscope measurements performed on the MBNC detected the presence magnetic domains with high and weak intensity magnetic field, confirming the magnetic nature of the MBNC pellicle. Young&#39;s modulus values obtained in this work are also in a reasonable agreement with those reported for several blood vessels in previous studies.

Here, we present a protocol to make a bacterial nanocellulose (BNC) magnetic for applications in damaged blood vessel reconstruction. The BNC was synthesized by G. xylinus strain. On the other hand, magnetization of the BNC was realized through in situ precipitation of Fe2+ and Fe3+ ferrous ions inside the BNC mesh.

Demir Oksit Nanopartiküller ile Fonksiyonlu Manyetik Bakteriyel Nanocellulose Fabrikasyon

In this study, bacterial nanocellulose (BNC) produced by the bacteria Gluconacetobacter xylinus is synthesized and impregnated in situ with iron oxide ...

Development of a Multicellular Three-dimensional Organotypic Model of the Human Intestinal Mucosa Grown Under Microgravity

Because cells growing in a three-dimensional (3-D) environment have the potential to bridge many gaps of cell cultivation in 2-D environments (e.g., flasks or dishes). In fact, it is widely recognized that cells grown in flasks or dishes tend to de-differentiate and lose specialized features of the tissues from which they were derived. Currently, there are mainly two types of 3-D culture systems where the cells are seeded into scaffolds mimicking the native extracellular matrix (ECM): (a) static models and (b) models using bioreactors. The first breakthrough was the static 3-D models. 3-D models using bioreactors such as the rotating-wall-vessel (RWV) bioreactors are a more recent development. The original concept of the RWV bioreactors was developed at NASA&#39;s Johnson Space Center in the early 1990s and is believed to overcome the limitations of static models such as the development of hypoxic, necrotic cores. The RWV bioreactors might circumvent this problem by providing fluid dynamics that allow the efficient diffusion of nutrients and oxygen. These bioreactors consist of a rotator base that serves to support and rotate two different formats of culture vessels that differ by their aeration source type: (1) Slow Turning Lateral Vessels (STLVs) with a co-axial oxygenator in the center, or (2) High Aspect Ratio Vessels (HARVs) with oxygenation via a flat, silicone rubber gas transfer membrane. These vessels allow efficient gas transfer while avoiding bubble formation and consequent turbulence. These conditions result in laminar flow and minimal shear force that models reduced gravity (microgravity) inside the culture vessel. Here we describe the development of a multicellular 3-D organotypic model of the human intestinal mucosa composed of an intestinal epithelial cell line and primary human lymphocytes, endothelial cells and fibroblasts cultured under microgravity provided by the RWV bioreactor.

Cells growing in a three-dimensional (3-D) environment represent a marked improvement over cell cultivation in 2-D environments (e.g., flasks or dishes). Here we describe the development of a multicellular 3-D organotypic model of the human intestinal mucosa cultured under microgravity provided by rotating-wall-vessel (RWV) bioreactors.

İnsan bağırsak mukozasının bir Multisellüler Üç boyutlu Organotipik Modelinin Geliştirilmesi yerçekimi Yetiştirilen

Because cells growing in a three-dimensional (3-D) environment have the potential to bridge many gaps of cell cultivation in 2-D environments (e.g., ...

Mesenchymal Stromal Cell Culture and Delivery in Autologous Conditions: A Smart Approach for Orthopedic Applications

Human Mesenchymal Stromal Cells (hMSCs) are cultured in vitro with different media. Limits on their use in clinical settings, however, mainly depend on potential biohazard and inflammation risks exerted by xenogeneic nutrients for their culture. Human derivatives or recombinant materials are the first choice candidates to reduce these reactions. Therefore, culture supplements and materials of autologous origin represent the best nutrients and the safest products.
Here, we describe a new protocol for the isolation and culture of bone marrow hMSCs in autologous conditions &#8212;&#160;namely,&#160;patient-derived serum as a supplement for the culture medium and fibrin as a scaffold for hMSC administration. Indeed, hMSC/fibrin clot constructs could be extremely useful for several clinical applications. In particular, we focus on their use in orthopedic surgery, where the fibrin clot derived from the donor&#39;s own blood allowed effective cell delivery and nutrient/waste exchanges. To ensure optimal safety conditions, it is of the utmost importance to avoid the risks of hMSC transformation and tissue overgrowth. For these reasons, the approach described in this paper also indicates a minimally ex vivo hMSC expansion, to reduce cell senescence and morphologic changes, and short-term osteo-differentiation before implantation, to induce osteogenic lineage specification, thus decreasing the risk of subsequent uncontrolled proliferation.

Culturing human Mesenchymal Stromal Cells (hMSCs) with autologous serum, reduces the risks of rejection by xenogeneic material and other negative effects. It also allows for the recovery of a subset of mesodermal progenitors, which can deliver fresh hMSCs. Embedding hMSCs in an autologous fibrin clot enables easy handling and effective surgical implantation.

Mezenkimal Stromal Otolog Koşullarında Hücre Kültürü ve Teslimat: Ortopedik Uygulamalar için Akıllı Yaklaşım

Human Mesenchymal Stromal Cells (hMSCs) are cultured in vitro with different media. Limits on their use in clinical settings, however, mainly depend on ...

DNA Nanotubes as a Versatile Tool to Study Semiflexible Polymers

Mechanical properties of complex, polymer-based soft matter, such as cells or biopolymer networks, can be understood in neither the classical frame of flexible polymers nor of rigid rods. Underlying filaments remain outstretched due to their non-vanishing backbone stiffness, which is quantified via the persistence length (lp), but they are also subject to strong thermal fluctuations. Their finite bending stiffness leads to unique, non-trivial collective mechanics of bulk networks, enabling the formation of stable scaffolds at low volume fractions while providing large mesh sizes. This underlying principle is prevalent in nature (e.g., in cells or tissues), minimizing the high molecular content and thereby facilitating diffusive or active transport. Due to their biological implications and potential technological applications in biocompatible hydrogels, semiflexible polymers have been subject to considerable study. However, comprehensible investigations remained challenging since they relied on natural polymers, such as actin filaments, which are not freely tunable. Despite these limitations and due to the lack of synthetic, mechanically tunable, and semiflexible polymers, actin filaments were established as the common model system. A major limitation is that the central quantity lp cannot be freely tuned to study its impact on macroscopic bulk structures. This limitation was resolved by employing structurally programmable DNA nanotubes, enabling controlled alteration of the filament stiffness. They are formed through tile-based designs, where a discrete set of partially complementary strands hybridize in a ring structure with a discrete circumference. These rings feature sticky ends, enabling the effective polymerization into filaments several microns in length, and display similar polymerization kinetics as natural biopolymers. Due to their programmable mechanics, these tubes are versatile, novel tools to study the impact of lp on the single-molecule as well as the bulk scale. In contrast to actin filaments, they remain stable over weeks, without notable degeneration, and their handling is comparably straightforward.

Semiflexible polymers display unique mechanical properties that are extensively applied by living systems. However, systematic studies on biopolymers are limited since properties such as polymer rigidity are inaccessible. This manuscript describes how this limitation is circumvented by programmable DNA nanotubes, enabling experimental studies on the impact of filament rigidity.

DNA nanotüpler Semiflexible polimerler eğitim için çok yönlü bir araç olarak

Mechanical properties of complex, polymer-based soft matter, such as cells or biopolymer networks, can be understood in neither the classical frame of ...

Bioprinting of Cartilage and Skin Tissue Analogs Utilizing a Novel Passive Mixing Unit Technique for Bioink Precellularization

Bioprinting is a powerful technique for the rapid and reproducible fabrication of constructs for tissue engineering applications. In this study, both cartilage and skin analogs were fabricated after bioink pre-cellularization utilizing a novel passive mixing unit technique. This technique was developed with the aim to simplify the steps involved in the mixing of a cell suspension into a highly viscous bioink. The resolution of filaments deposited through bioprinting necessitates the assurance of uniformity in cell distribution prior to printing to avoid the deposition of regions without cells or retention of large cell clumps that can clog the needle. We demonstrate the ability to rapidly blend a cell suspension with a bioink prior to bioprinting of both cartilage and skin analogs. Both tissue analogs could be cultured for up to 4 weeks. Histological analysis demonstrated both cell viability and deposition of tissue specific extracellular matrix (ECM) markers such as glycosaminoglycans (GAGs) and collagen I respectively.

Cartilage and skin analogs were bioprinted using a nanocellulose-alginate based bioink. The bioinks were cellularized prior to printing via a single step passive mixing unit. The constructs were demonstrated to be uniformly cellularized, have high viability, and exhibit favorable markers of differentiation.

Bioprinting kıkırdak ve cilt doku analogları bir roman pasif birimi teknik Bioink Precellularization için karıştırma kullanmak

Bioprinting is a powerful technique for the rapid and reproducible fabrication of constructs for tissue engineering applications. In this study, both ...

Recombinant Collagen I Peptide Microcarriers for Cell Expansion and Their Potential Use As Cell Delivery System in a Bioreactor Model

Tissue engineering is a promising field, focused on developing solutions for the increasing demand on tissues and organs regarding transplantation purposes. The process to generate such tissues is complex, and includes an appropriate combination of specific cell types, scaffolds, and physical or biochemical stimuli to guide cell growth and differentiation. Microcarriers represent an appealing tool to expand cells in a three-dimensional (3D) microenvironment, since they provide higher surface-to volume ratios and mimic more closely the in vivo situation compared to traditional two-dimensional methods. The vascular system, supplying oxygen and nutrients to the cells and ensuring waste removal, constitutes an important building block when generating engineered tissues. In fact, most constructs fail after being implanted due to lacking vascular support. In this study, we present a protocol for endothelial cell expansion on recombinant collagen-based microcarriers under dynamic conditions in spinner flask and bioreactors, and we explain how to determine in this setting cell viability and functionality. In addition, we propose a method for cell delivery for vascularization purposes without additional detachment steps necessary. Furthermore, we provide a strategy to evaluate the cell vascularization potential in a perfusion bioreactor on a decellularized&#160;biological matrix. We believe that the use of the presented methods could lead to the development of new cell-based therapies for a large range of tissue engineering applications in the clinical practice.

We propose a cell expansion protocol on macroporous microcarriers and their use as delivery system in a perfusion bioreactor to seed a decellularized tissue matrix. We also include different techniques to determine cell proliferation and viability of cells cultured on microcarriers. Furthermore, we demonstrate functionality of cells after bioreactor cultures.