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https://www.readbyqxmd.com/read/29456625/alignment-of-microbial-fitness-with-engineered-product-formation-obligatory-coupling-between-acetate-production-and-photoautotrophic-growth
#1
Wei Du, Joeri A Jongbloets, Coco van Boxtel, Hugo Pineda Hernández, David Lips, Brett G Oliver, Klaas J Hellingwerf, Filipe Branco Dos Santos
Background: Microbial bioengineering has the potential to become a key contributor to the future development of human society by providing sustainable, novel, and cost-effective production pipelines. However, the sustained productivity of genetically engineered strains is often a challenge, as spontaneous non-producing mutants tend to grow faster and take over the population. Novel strategies to prevent this issue of strain instability are urgently needed. Results: In this study, we propose a novel strategy applicable to all microbial production systems for which a genome-scale metabolic model is available that aligns the production of native metabolites to the formation of biomass...
2018: Biotechnology for Biofuels
https://www.readbyqxmd.com/read/29455070/oral-engineered-bifidobacterium-longum-expressing-rhmnsod-to-suppress-experimental-colitis
#2
Mengge Liu, Shiyu Li, Qian Zhang, Zhenrui Xu, Jiajia Wang, Hanxiao Sun
In recent years, using genetic engineering and bioengineering techniques, Bifidobacterium as a carrier to express specific functions of the protein or polypeptide, has become a new treatment for disease. Ulcerative colitis (UC) is a type of inflammatory bowel diseases (IBD). Although the cause of this inflammatory disorder is still unknown, a large amount of evidence suggests that ulcerative colitis is associated with increased activity of reactive oxygen species (ROS), manganese superoxide dismutase (MnSOD) is a kind of superoxide dismutase (SOD) has been demonstrated to play a key role in the pathophysiology of colitis...
February 14, 2018: International Immunopharmacology
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/29453226/modeling-the-human-bone-marrow-niche-in-mice-from-host-bone-marrow-engraftment-to-bioengineering-approaches
#4
REVIEW
Ander Abarrategi, Syed A Mian, Diana Passaro, Kevin Rouault-Pierre, William Grey, Dominique Bonnet
Xenotransplantation of patient-derived samples in mouse models has been instrumental in depicting the role of hematopoietic stem and progenitor cells in the establishment as well as progression of hematological malignancies. The foundations for this field of research have been based on the development of immunodeficient mouse models, which provide normal and malignant human hematopoietic cells with a supportive microenvironment. Immunosuppressed and genetically modified mice expressing human growth factors were key milestones in patient-derived xenograft (PDX) models, highlighting the importance of developing humanized microenvironments...
February 16, 2018: Journal of Experimental Medicine
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/29451490/-alternative-bases-and-synthetic-life
#6
Bertrand Jordan
Alternative bases that can fit into the DNA double helix have now been used in vivo to direct the synthesis of proteins incorporating unnatural amino acids. This bioengineering feat is significant at both the conceptual and the practical levels.
February 2018: Médecine Sciences: M/S
https://www.readbyqxmd.com/read/29449345/antimicrobial-activity-of-a-novel-bioengineered-honey-against-non-typeable-haemophilus-influenzae-biofilms-an-in-vitro-study
#7
Rachel S Newby, Matthew Dryden, Raymond N Allan, Rami J Salib
The opportunistic pathogen non-typeable Haemophilus influenzae (NTHi) plays an important role in many chronic respiratory diseases including otitis media, chronic rhinosinusitis, cystic fibrosis and chronic obstructive pulmonary disease. Biofilm formation has been implicated in NTHi colonisation, persistence of infection and recalcitrance towards antimicrobials. There is therefore a pressing need for the development of novel treatment strategies that are effective against NTHi biofilm-associated diseases. SurgihoneyRO is a honey-based product that has been bioengineered to enable the slow release of H 2 O 2 , a reactive oxygen species to which H...
February 15, 2018: Journal of Clinical Pathology
https://www.readbyqxmd.com/read/29446015/synthetic-polymeric-biomaterials-for-wound-healing-a-review
#8
Mariam Mir, Murtaza Najabat Ali, Afifa Barakullah, Ayesha Gulzar, Munam Arshad, Shizza Fatima, Maliha Asad
Wounds are of a variety of types and each category has its own distinctive healing requirements. This realization has spurred the development of a myriad of wound dressings, each with specific characteristics. It is unrealistic to expect a singular dressing to embrace all characteristics that would fulfill generic needs for wound healing. However, each dressing may approach the ideal requirements by deviating from the 'one size fits all approach', if it conforms strictly to the specifications of the wound and the patient...
February 14, 2018: Progress in Biomaterials
https://www.readbyqxmd.com/read/29440702/a-fluidic-device-for-the-controlled-formation-and-real-time-monitoring-of-soft-membranes-self-assembled-at-liquid-interfaces
#9
Arturo Mendoza-Meinhardt, Lorenzo Botto, Alvaro Mata
Membrane materials formed at the interface between two liquids have found applications in a large variety of technologies, from sensors to drug-delivery and catalysis. However, studying the formation of these membranes in real-time presents considerable challenges, owing to the difficulty of prescribing the location and instant of formation of the membrane, the difficulty of observing time-dependent membrane shape and thickness, and the poor reproducibility of results obtained using conventional mixing procedures...
February 13, 2018: Scientific Reports
https://www.readbyqxmd.com/read/29438902/secret-handshakes-cell-cell-interactions-and-cellular-mimics
#10
REVIEW
Daniel J Cohen, W James Nelson
Cell-cell junctions, acting as 'secret handshakes', mediate cell-cell interactions and make multicellularity possible. Work over the previous century illuminated key players comprising these junctions including the cadherin superfamily, nectins, CAMs, connexins, notch/delta, lectins, and eph/Ephrins. Recent work has focused on elucidating how interactions between these complex and often contradictory cues can ultimately give rise to large-scale organization in tissues. This effort, in turn, has enabled bioengineering advances such as cell-mimetic interfaces that allow us to better probe junction biology and to develop new biomaterials...
February 2, 2018: Current Opinion in Cell Biology
https://www.readbyqxmd.com/read/29437383/encoding-stem-cell-secreted-extracellular-matrix-protein-capture-in-two-and-three-dimensions-using-protein-binding-peptides
#11
Hadi Hezaveh, Steffen Cosson, Ellen A Otte, Guannan Su, Benjamin D Fairbanks, Justin J Cooper-White
Capturing cell-secreted extracellular matrix (ECM) proteins through cooperative binding with high specificity and affinity is an important function of native tissue matrices during both tissue homeostasis and repair. However, whilst synthetic hydrogels, such as those based on polyethylene glycol (PEG), are often proposed as ideal materials to deliver human mesenchymal stem cells (hMSCs) to sites of injury to enable tissue repair, they do not have this capability, a capability that would enable cells to actively remodel their local extracellular microenvironment and potentially provide the required feedback control for more effective tissue genesis...
February 13, 2018: Biomacromolecules
https://www.readbyqxmd.com/read/29437201/variations-during-ageing-in-the-three-dimensional-anatomical-arrangement-of-fascicles-within-the-equine-superficial-digital-flexor-tendon
#12
O J Ali, E J Comerford, P D Clegg, E G Canty-Laird
BiTendons are constructed from collagenous fascicles separated by endotenon/interfascicular matrix (IFM). Tendons may be specialised for precision movement or to store energy during locomotion and for the latter the elasticity of the endotenon/IFM is particularly important. The equine superficial digital flexor tendon (SDFT) is a dedicated energy-storing tendon with a similar function to the human Achilles tendon. Classical anatomical descriptions portray fascicles as longitudinally arranged distinct anatomical structures...
February 13, 2018: European Cells & Materials
https://www.readbyqxmd.com/read/29436241/bladder-regeneration-through-stem-cell-therapy
#13
Jakub Smolar, Maya Horst, Tulio Sulser, Daniel Eberli
Introduction Impaired bladder function in children and adults often causes lifelong morbidity, as functional therapeutic approaches in this field are nonexistent. If reconstructive procedures are required, intestinal tissue is used as a gold standard for bladder repair. As this procedure is associated with significant long-term complications there is a strong clinical need for alternative sources of stable and reliable bladder tissue, of which stem cells are considered most promising. Areas covered This review focusses on the recent development in the use of stem cells for bladder bioengineering...
February 13, 2018: Expert Opinion on Biological Therapy
https://www.readbyqxmd.com/read/29434619/from-bioengineering-to-crispr-cas9-a-personal-retrospective-of-20-years-of-research-in-programmable-genome-targeting
#14
Albert Jeltsch
Genome targeting of restriction enzymes and DNA methyltransferases has many important applications including genome and epigenome editing. 15-20 years ago, my group was involved in the development of approaches for programmable genome targeting, aiming to connect enzymes with an oligodeoxynucleotide (ODN), which could form a sequence-specific triple helix at the genomic target site. Importantly, the target site of such enzyme-ODN conjugate could be varied simply by altering the ODN sequence promising great applicative values...
2018: Frontiers in Genetics
https://www.readbyqxmd.com/read/29432190/accelerated-wound-healing-in-mice-by-on-site-production-and-delivery-of-cxcl12-by-transformed-lactic-acid-bacteria
#15
Evelina Vågesjö, Emelie Öhnstedt, Anneleen Mortier, Hava Lofton, Fredrik Huss, Paul Proost, Stefan Roos, Mia Phillipson
Impaired wound closure is a growing medical problem associated with metabolic diseases and aging. Immune cells play important roles in wound healing by following instructions from the microenvironment. Here, we developed a technology to bioengineer the wound microenvironment and enhance healing abilities of the immune cells. This resulted in strongly accelerated wound healing and was achieved by transforming Lactobacilli with a plasmid encoding CXCL12. CXCL12-delivering bacteria administrated topically to wounds in mice efficiently enhanced wound closure by increasing proliferation of dermal cells and macrophages, and led to increased TGF-β expression in macrophages...
February 5, 2018: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/29431584/horizon-scanning-how-will-metabolomics-applications-transform-food-science-bioengineering-and-medical-innovation-in-the-current-era-of-foodomics
#16
Mustafa Bayram, Çağlar Gökırmaklı
Food and engineering sciences have tended to neglect the importance of human nutrition sciences and clinical study of new molecules discovered by food engineering community, and vice versa. Yet, the value of systems thinking and use of omics technologies in food engineering are rapidly emerging. Foodomics is a new concept and practice to bring about "precision nutrition" and integrative bioengineering studies of food composition, quality, and safety, and applications to improve health of humans, animals, and other living organisms on the planet...
February 12, 2018: Omics: a Journal of Integrative Biology
https://www.readbyqxmd.com/read/29430872/semaphorin-3a-receptor-inhibitor-as-a-novel-therapeutic-to-promote-innervation-of-bioengineered-teeth
#17
Sabine Kuchler-Bopp, Dominique Bagnard, Michael Van-der-Heyden, Ysia Idoux-Gillet, Marion Strub, Hervé Gegout, Hervé Lesot, Nadia Benkirane-Jessel, Laetitia Keller
The sensory innervation of the dental pulp is essential for tooth function and protection. It is mediated by axons originating from the trigeminal ganglia and is spatio-temporally regulated. We have previously shown that the innervation of bioengineered teeth can be achieved only under immunosuppressive conditions. The aim of this study was to develop a model to determine the role of Semaphorin 3A (Sema3A) in the innervation of bioengineered teeth. We first analyzed innervation of the dental pulp of mandibular first molars in newborn (postnatal day 0: PN0) mice deficient for Sema3A (Sema3A-/- ), a strong inhibitor of axon growth...
February 11, 2018: Journal of Tissue Engineering and Regenerative Medicine
https://www.readbyqxmd.com/read/29429944/engineering-stem-and-stromal-cell-therapies-for-musculoskeletal-tissue-repair
#18
REVIEW
Claudia Loebel, Jason A Burdick
Stem cells and tissue-derived stromal cells stimulate the repair of degenerated and injured tissues, motivating a growing number of cell-based interventions in the musculoskeletal field. Recent investigations have indicated that these cells are critical for their trophic and immunomodulatory role in controlling endogenous cells. This Review presents recent clinical advances where stem cells and stromal cells have been used to stimulate musculoskeletal tissue repair, including delivery strategies to improve cell viability and retention...
February 6, 2018: Cell Stem Cell
https://www.readbyqxmd.com/read/29428727/establishment-of-mouse-gingival-junctional-epithelial-cell-line-using-a-bioengineered-tooth-system
#19
Tatsuaki Seki, Ryo Aizawa, Junichi Tanaka, Sara Yajima-Himuro, Mayu Kato, Keisuke Tanaka, Kenji Mishima, Matsuo Yamamoto
Junctional epithelium (JE), one of the constituents of periodontal tissue, has several unique features to prevent bacterial infection. However, the molecular mechanisms of these cells remain to be completely elucidated because there has been no JE cell line to date. We have succeeded in isolating JE cells expressing green fluorescent protein (GFP) by using a bioengineered tooth technique in mice. The gene expressions of GFP-positive JE cells, isolated from around the erupted bioengineered teeth using flow cytometry, were analyzed by RNA sequencing...
February 8, 2018: Biochemical and Biophysical Research Communications
https://www.readbyqxmd.com/read/29423618/organotypic-models-of-lung-cancer
#20
Anna Pomerenke
Human lung cancer is one of the leading causes of death worldwide, with nearly 2 million of new cases diagnosed each year, often too late for a successful therapeutic intervention. In this chapter, organotypic models of lung cancer will be reviewed. Ex vivo tissue explants, spheroids, organoids, and novel bioengineering approaches are currently being used to study human lung cancer. Although there is no ideal method that will fully recapitulate the complex human lung architecture, the three-dimensional (3D) organotypic models described here represent a major advance from classical two-dimensional (2D) tissue culture models...
February 9, 2018: Current Topics in Microbiology and Immunology
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