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https://www.readbyqxmd.com/read/29454158/polyisocyanopeptide-hydrogels-a-novel-thermo-responsive-hydrogel-supporting-pre-vascularization-and-the-development-of-organotypic-structures
#1
Jakub Zimoch, Joan Simó Padial, Agnes S Klar, Queralt Vallmajo-Martin, Martin Meuli, Thomas Biedermann, Christopher J Wilson, Alan Rowan, Ernst Reichmann
Molecular and mechanical interactions with the 3D extracellular matrix are essential for cell functions such as survival, proliferation, migration, and differentiation. Thermo-responsive biomimetic polyisocyanopeptide (PIC) hydrogels are promising new candidates for 3D cell, tissue, and organ cultures. This is a synthetic, thermo-responsive and stress-stiffening material synthesized via polymerization of the corresponding monomers using a nickel perchlorate as a catalyst. It can be tailored to meet various demands of cells by modulating its stiffness and through the decoration of the polymer with short GRGDS peptides using copper free click chemistry...
February 14, 2018: Acta Biomaterialia
https://www.readbyqxmd.com/read/29454157/nanofibrous-plga-electrospun-scaffolds-modified-with-type-i-collagen-influence-hepatocyte-function-and-support-viability-in-vitro
#2
Jessica H Brown, Prativa Das, Michael D DiVito, David Ivancic, Lay Poh Tan, Jason A Wertheim
A major challenge of maintaining primary hepatocytes in vitro is progressive loss of hepatocyte-specific functions, such as protein synthesis and cytochrome P450 (CYP450) catalytic activity. We developed a three-dimensional (3D) nanofibrous scaffold made from poly(L-lactide-co-glycolide) (PLGA) polymer using a newlyoptimizedwet electrospinning techniquethat resulted in a highly porous structure that accommodated inclusion of primary human hepatocytes. Extracellular matrix (ECM) proteins (type I collagen or fibronectin) at varying concentrations were chemically linked to electrospun PLGA using amine coupling to develop an in vitro culture system containing the minimal essential ECM components of the liver micro-environment that preserve hepatocyte function in vitro...
February 14, 2018: Acta Biomaterialia
https://www.readbyqxmd.com/read/29453454/a-microvascularized-tumor-mimetic-platform-for-assessing-anti-cancer-drug-efficacy
#3
Shantanu Pradhan, Ashley M Smith, Charles J Garson, Iman Hassani, Wen J Seeto, Kapil Pant, Robert D Arnold, Balabhaskar Prabhakarpandian, Elizabeth A Lipke
Assessment of anti-cancer drug efficacy in in vitro three-dimensional (3D) bioengineered cancer models provides important contextual and relevant information towards pre-clinical translation of potential drug candidates. However, currently established models fail to sufficiently recapitulate complex tumor heterogeneity. Here we present a chip-based tumor-mimetic platform incorporating a 3D in vitro breast cancer model with a tumor-mimetic microvascular network, replicating the pathophysiological architecture of native vascularized breast tumors...
February 16, 2018: Scientific Reports
https://www.readbyqxmd.com/read/29452946/time-responsive-osteogenic-niche-of-stem-cells-a-sequentially-triggered-dual-peptide-loaded-alginate-hybrid-system-for-promoting-cell-activity-and-osteo-differentiation
#4
Zuyuan Luo, Siqi Zhang, Jijia Pan, Rui Shi, Hao Liu, Yalin Lyu, Xiao Han, Yan Li, Yue Yang, Zhixiu Xu, Yi Sui, En Luo, Yuanyuan Zhang, Shicheng Wei
The efficacy of stem cell-based bone tissue engineering has been hampered by cell death and limited fate control. A smart cell culture system with the capability of sequentially delivering multiple factors in specific growth stages, like the mechanism of the natural extracellular matrix modulating tissue formation, is attractive for enhancing cell activity and controlling cell fate. Here, a bone forming peptide-1 (BFP-1)-laden mesoporous silica nanoparticles (pep@MSNs) incorporated adhesion peptide, containing the arginine-glycine-aspartic acid (RGD) domain, modified alginate hydrogel (RA) system (pep@MSNs-RA) was developed to promote the activity and stimulate osteo-differentiation of human mesenchymal stem cells (hMSCs) in sequence...
February 10, 2018: Biomaterials
https://www.readbyqxmd.com/read/29452273/3d-bioprinted-functional-and-contractile-cardiac-tissue-constructs
#5
Zhan Wang, Sang Jin Lee, Heng-Jie Cheng, James J Yoo, Anthony Atala
Bioengineering of a functional cardiac tissue composed of primary cardiomyocytes has great potential for myocardial regeneration and in vitro tissue modeling. However, its applications remain limited because the cardiac tissue is a highly organized structure with unique physiologic, biomechanical, and electrical properties. In this study, we undertook a proof-of-concept study to develop a contractile cardiac tissue with cellular organization, uniformity, and scalability by using three-dimensional (3D) bioprinting strategy...
February 13, 2018: Acta Biomaterialia
https://www.readbyqxmd.com/read/29450919/looking-into-the-future-toward-advanced-3d-biomaterials-for-stem-cell-based-regenerative-medicine
#6
REVIEW
Zhongmin Liu, Mingliang Tang, Jinping Zhao, Renjie Chai, Jiuhong Kang
Stem-cell-based therapies have the potential to provide novel solutions for the treatment of a variety of diseases, but the main obstacles to such therapies lie in the uncontrolled differentiation and functional engraftment of implanted tissues. The physicochemical microenvironment controls the self-renewal and differentiation of stem cells, and the key step in mimicking the stem cell microenvironment is to construct a more physiologically relevant 3D culture system. Material-based 3D assemblies of stem cells facilitate the cellular interactions that promote morphogenesis and tissue organization in a similar manner to that which occurs during embryogenesis...
February 16, 2018: Advanced Materials
https://www.readbyqxmd.com/read/29447961/a-physiologically-relevant-3d-collagen-based-scaffold-neuroblastoma-cell-system-exhibits-chemosensitivity-similar-to-orthotopic-xenograft-models
#7
C Curtin, J C Nolan, R Conlon, L Deneweth, C Gallagher, Y J Tan, B L Cavanagh, A Z Asraf, H Harvey, S Miller-Delaney, J Shohet, I Bray, F J O'Brien, R L Stallings, O Piskareva
3D scaffold-based in vitro cell culturing is a recent technological advancement in cancer research bridging the gap between conventional 2D culture and in vivo tumours. The main challenge in treating neuroblastoma, a paediatric cancer of the sympathetic nervous system, is to combat tumour metastasis and resistance to multiple chemotherapeutic drugs. The aim of this study was to establish a physiologically relevant 3D neuroblastoma tissue-engineered system and explore its therapeutic relevance. Two neuroblastoma cell lines, chemotherapeutic sensitive Kelly and chemotherapeutic resistant KellyCis83 were cultured in a 3D in vitro model on two collagen-based scaffolds containing either glycosaminoglycan (Coll-GAG) or nanohydroxyapatite (Coll-nHA) and compared to 2D cell culture and an orthotopic murine model...
February 12, 2018: Acta Biomaterialia
https://www.readbyqxmd.com/read/29446982/development-of-an-omentum-cultured-oesophageal-scaffold-reinforced-by-a-3d-printed-ring-feasibility-of-an-in-vivo-bioreactor
#8
Eun-Jae Chung, Hyung Woo Ju, Yeung Kyu Yeon, Ji Seung Lee, Young Jin Lee, Ye Been Seo, Park Chan Hum
Current treatments of oesophageal diseases, such as carcinoma, congenital abnormality or trauma, require surgical intervention and oesophageal reconstruction with the stomach, jejunum or colon. However, serious side effects are possible with each treatment option. Despite tissue engineering promising to be an effective regenerative strategy, no functional solution currently exists for oesophageal reconstruction. Here, we developed an omentum-cultured oesophageal scaffold reinforced by a 3D-printed ring. The nano-structured scaffolds were wrapped into the omentum of rats and orthotopically transplanted for the repair of circumferential oesophageal defects two weeks later...
February 15, 2018: Artificial Cells, Nanomedicine, and Biotechnology
https://www.readbyqxmd.com/read/29445812/3d-cellular-structures-and-co-cultures-formed-through-the-contactless-magnetic-manipulation-of-cells-on-adherent-surfaces
#9
Abdel Rahman Abdel Fattah, Sarah Mishriki, Tobias Kammann, Rakesh P Sahu, Fei Geng, Ishwar K Puri
A magnet array is employed to manipulate diamagnetic cells that are contained in paramagnetic medium to demonstrate for the first time the contactless bioprinting of three-dimensional (3D) cellular structures and co-cultures of breast cancer MCF-7 and endothelial HUVEC at prescribed locations on tissue culture treated well plates. Sequential seeding of different cell lines and the spatial displacement of the magnet array creates co-cultured cellular structures within a well without using physically intrusive well inserts...
February 15, 2018: Biomaterials Science
https://www.readbyqxmd.com/read/29443512/diels-alder-click-crosslinked-hydrogels-with-increased-reactivity-enable-3d-cell-encapsulation
#10
Laura J Smith, S Maryamdokht Taimoory, Roger Y Tam, Alexander E G Baker, Niema Binth Mohammad, John F Trant, Molly S Shoichet
Engineered hydrogels have been extensively used to direct cell function in 3D cell culture models, which are more representative of the native cellular microenvironment than conventional 2D cell culture. Previously, hyaluronan-furan and bis-maleimide polyethylene glycol hydrogels were synthesized via Diels-Alder chemistry at acidic pH, which did not allow encapsulation of viable cells. In order to enable gelation at physiological pH, the reaction kinetics were accelerated by replacing the hyaluronan-furan with the more electron-rich hyaluronan-methylfuran...
February 14, 2018: Biomacromolecules
https://www.readbyqxmd.com/read/29443048/generation-of-standardized-and-reproducible-forebrain-type-cerebral-organoids-from-human-induced-pluripotent-stem-cells
#11
Olivia Krefft, Ammar Jabali, Vira Iefremova, Philipp Koch, Julia Ladewig
The human cortex is highly expanded and exhibits a complex structure with specific functional areas, providing higher brain function, such as cognition. Efforts to study human cerebral cortex development have been limited by the availability of model systems. Translating results from rodent studies to the human system is restricted by species differences and studies on human primary tissues are hampered by a lack of tissue availability as well as ethical concerns. Recent development in human pluripotent stem cell (PSC) technology include the generation of three-dimensional (3D) self-organizing organotypic culture systems, which mimic to a certain extent human-specific brain development in vitro...
January 23, 2018: Journal of Visualized Experiments: JoVE
https://www.readbyqxmd.com/read/29438884/sprouting-angiogenesis-induces-significant-mechanical-heterogeneities-and-ecm-stiffening-across-length-scales-in-fibrin-hydrogels
#12
Benjamin A Juliar, Mark T Keating, Yen P Kong, Elliot L Botvinick, Andrew J Putnam
Matrix stiffness is a well-established instructive cue in two-dimensional cell cultures. Its roles in morphogenesis in 3-dimensional (3D) cultures, and the converse effects of cells on the mechanics of their surrounding microenvironment, have been more elusive given the absence of suitable methods to quantify stiffness on a length-scale relevant for individual cell-extracellular matrix (ECM) interactions. In this study, we applied traditional bulk rheology and laser tweezers-based active microrheology to probe mechanics across length scales during the complex multicellular process of capillary morphogenesis in 3D, and further characterized the relative contributions of neovessels and supportive stromal cells to dynamic changes in stiffness over time...
February 6, 2018: Biomaterials
https://www.readbyqxmd.com/read/29438729/hyaluronan-chemistries-for-three-dimensional-matrix-applications
#13
REVIEW
Monica A Serban, Aleksander Skardal
Hyaluronan is a ubiquitous constituent of mammalian extracellular matrices and, because of its excellent intrinsic biocompatibility and chemical modification versatility, has been widely employed in a multitude of biomedical applications. In this article, we will survey the approaches used to tailor hyaluronan to specific needs of tissue engineering, regenerative and reconstructive medicine and overall biomedical research. We will also describe recent examples of applications in these broader areas, such as 3D cell culture, bioprinting, organoid biofabrication, and precision medicine that are facilitated by the use of hyaluronan as a biomaterial...
February 10, 2018: Matrix Biology: Journal of the International Society for Matrix Biology
https://www.readbyqxmd.com/read/29435298/generation-of-highly-differentiated-bhy-oral-squamous-cell-carcinoma-multicellular-spheroids
#14
Denise Sievers, Jens Bunzendahl, Alice Frosch, Christina Perske, Bernhard Hemmerlein, Henning Schliephake, Phillipp Brockmeyer
Three-dimensional (3D) multicellular spheroids (MCS) are considered suitable models in cancer research and anticancer drug development. Although studying the complex tumour characteristics from all different degrees of malignancy is vital, MCS generation has only been described in a few moderately- and poorly differentiated oral squamous cell carcinoma (OSCC) cell lines. No previous study has demonstrated the MCS formation in a highly differentiated OSCC cell line. For the first time, the present study aimed to generate MCS from the highly differentiated OSCC cell line BHY...
February 2018: Molecular and Clinical Oncology
https://www.readbyqxmd.com/read/29435153/heterotypic-breast-cancer-model-based-on-a-silk-fibroin-scaffold-to-study-the-tumor-microenvironment
#15
Ewelina Dondajewska, Wojciech Juzwa, Andrzej Mackiewicz, Hanna Dams-Kozlowska
An intensive investigation of the development of in vitro models to study tumor biology has led to the generation of various three-dimensional (3D) culture methods that better mimic in vivo conditions. The tumor microenvironment (TME) is shaped by direct interactions among cancer cells, cancer-associated cells and the extracellular matrix (ECM). Recognizing the need to incorporate both tissue dimensionality and the heterogeneity of cells, we have developed a 3D breast cancer model. NIH3T3 fibroblasts and EMT6 breast cancer cell lines were seeded in various ratios onto a silk fibroin scaffold...
January 12, 2018: Oncotarget
https://www.readbyqxmd.com/read/29434277/three-dimensional-3d-tetra-culture-brain-on-chip-platform-for-organophosphate-toxicity-screening
#16
Youngmi Koo, Brian T Hawkins, Yeoheung Yun
Organophosphate-based compounds (OPs) represent a significant threat to warfighters (nerve agents) and civilian populations (pesticides). There is a pressing need to develop in vitro brain models that correlate to the in vivo brain to rapidly study OPs for neurotoxicity. Here we report on a microfluidic-based three-dimensional, four-cell tissue construct consisting of 1) a blood-brain barrier that has dynamic flow and membrane-free culture of the endothelial layer, and 2) an extracellular matrix (ECM)-embedded tissue construct with neuroblastoma, microglia, and astrocytes...
February 12, 2018: Scientific Reports
https://www.readbyqxmd.com/read/29432654/eccrine-sweat-glands-associate-with-the-human-hair-follicle-within-a-defined-compartment-of-dermal-white-adipose-tissue
#17
E Poblet, F Jimenez-Acosta, E Escario-Travesedo, J A Hardman, I Hernández-Hernández, J L Agudo-Mena, J J Cabrera-Galvan, C Nicu, R Paus
BACKGROUND: Eccrine sweat glands (ESGs) are critical for thermoregulation and involved in wound healing. ESGs have traditionally been considered as separate skin appendages without connection to the pilosebaceous unit (PSU). However, recent preliminary evidence has encouraged the hypothesis that PSU and ESG are more interconnected than previously thought. OBJECTIVE: To reevaluate the morphology of human skin adnexa with an integrated 3D perspective in order to explore the possible interconnections that the PSU and the ESG may form...
February 12, 2018: British Journal of Dermatology
https://www.readbyqxmd.com/read/29429959/low-resting-membrane-potential-and-low-inward-rectifier-potassium-currents-are-not-inherent-features-of-hipsc-derived-cardiomyocytes
#18
András Horváth, Marc D Lemoine, Alexandra Löser, Ingra Mannhardt, Frederik Flenner, Ahmet Umur Uzun, Christiane Neuber, Kaja Breckwoldt, Arne Hansen, Evaldas Girdauskas, Hermann Reichenspurner, Stephan Willems, Norbert Jost, Erich Wettwer, Thomas Eschenhagen, Torsten Christ
Human induced pluripotent stem cell (hiPSC) cardiomyocytes (CMs) show less negative resting membrane potential (RMP), which is attributed to small inward rectifier currents (IK1). Here, IK1 was measured in hiPSC-CMs (proprietary and commercial cell line) cultured as monolayer (ML) or 3D engineered heart tissue (EHT) and, for direct comparison, in CMs from human right atrial (RA) and left ventricular (LV) tissue. RMP was measured in isolated cells and intact tissues. IK1 density in ML- and EHT-CMs from the proprietary line was similar to LV and RA, respectively...
February 7, 2018: Stem Cell Reports
https://www.readbyqxmd.com/read/29428530/rotenone-exerts-developmental-neurotoxicity-in-a-human-brain-spheroid-model
#19
David Pamies, Katharina Block, Pierre Lau, Laura Gribaldo, Carlos Pardo, Paula Barreras, Lena Smirnova, Daphne Wiersma, Liang Zhao, Georgina Harris, Thomas Hartung, Helena T Hogberg
Growing concern suggests that some chemicals exert (developmental) neurotoxicity (DNT and NT) and are linked to the increase in incidence of autism, attention deficit and hyperactivity disorders. The high cost of routine tests for DNT and neurotoxicity (NT) assessment make it difficult to test the high numbers of existing chemicals. Thus, more cost effective neurodevelopmental models are needed. The use of induced pluripotent stem cells (iPSC) in combination with the emerging human 3D tissue culture platforms, present a novel tool to predicting and study human toxicity...
February 8, 2018: Toxicology and Applied Pharmacology
https://www.readbyqxmd.com/read/29427302/multiple-roles-of-sim2-in-esophageal-squamous-cell-carcinoma-and-its-clinical-implications
#20
Masashi Tamaoki, Rie Komatsuzaki, Masayuki Komatsu, Keiko Minashi, Kazuhiko Aoyagi, Takao Nishimura, Fumiko Chiwaki, Tomoko Hiroki, Hiroyuki Daiko, Kazuhiro Morishita, Yoshiharu Sakai, Hiroshi Seno, Tsutomu Chiba, Manabu Muto, Teruhiko Yoshida, Hiroki Sasaki
The degree of histological differentiation is an important characteristic of cancers and may be associated with their malignant potentials. However, in squamous cell carcinomas, a key transcriptional factor to regulate tumor differentiation is largely unknown. Chemoradiotherapy (CRT) is a standard treatment for locally advanced esophageal squamous cell carcinoma (ESCC); however, the survival rate is still below 40%. From microarray data, SIM2 was overexpressed in the epithelial subtype. Here, we investigated the correlation between SIM2 expression and its clinical implication and in vitro and in vivo functions of SIM2 in tumor differentiation and in CRT sensitivity...
February 10, 2018: Cancer Science
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