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Cellular Biology

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https://www.readbyqxmd.com/read/29150981/systematic-proteomic-analysis-of-protein-methylation-in-prokaryotes-and-eukaryotes-revealed-distinct-substrate-specificity
#1
Min Zhang, Jun-Yu Xu, Hao Hu, Bang-Ce Ye, Minjia Tan
The studies of protein methylation mainly focus on lysine and arginine residues due to their diverse roles in essential cellular processes from gene expression to signal transduction. Nevertheless, atypical protein methylation occurring on amino acid residues, such as glutamine and glutamic acid, was largely neglected until recently. In addition, the systematic analysis for the distribution of methylation on different amino acids in various species is still lacking, which hinders our understanding of its functional roles...
November 18, 2017: Proteomics
https://www.readbyqxmd.com/read/29150924/comprehensive-profiling-of-lysine-acetylome-in-baculovirus-infected-silkworm-bombyx-mori-cells
#2
Dongbing Hu, Shengjie Xue, Cui Zhao, Ming Wei, Huihui Yan, Yanping Quan, Wei Yu
Bombyx mori is one of the key lepidopteran model species, and is economically important for silk production and proteinaceous drug expression. Baculovirus and insect host are important natural biological models for studying host-pathogen interactions. The impact of Bombyx mori nucleopolyhedrovirus (BmNPV) infection on the proteome and acetylome of Bombyx mori ovarian (BmN) cells were explored to facilitate a better understanding of infection-driven interactions between BmNPV and host in vitro. The proteome and acetylome were profiled through 6-plex Tandem mass tag (TMT) labelling-based quantitative proteomics...
November 18, 2017: Proteomics
https://www.readbyqxmd.com/read/29150629/statistically-strong-label-free-quantitative-identification-of-native-fluorophores-in-a-biological-sample
#3
Saabah B Mahbub, Martin Plöschner, Martin E Gosnell, Ayad G Anwer, Ewa M Goldys
Bioimaging using endogenous cell fluorescence, without any external biomarkers makes it possible to explore cells and tissues in their original native state, also in vivo. In order to be informative, this label-free method requires careful multispectral or hyperspectral recording of autofluorescence images followed by unsupervised extraction (unmixing) of biochemical signatures. The unmixing is difficult due to the scarcity of biochemically pure regions in cells and also because autofluorescence is weak compared with signals from labelled cells, typically leading to low signal to noise ratio...
November 17, 2017: Scientific Reports
https://www.readbyqxmd.com/read/29150615/balancing-a-genetic-toggle-switch-by-real-time-feedback-control-and-periodic-forcing
#4
Jean-Baptiste Lugagne, Sebastián Sosa Carrillo, Melanie Kirch, Agnes Köhler, Gregory Batt, Pascal Hersen
Cybergenetics is a novel field of research aiming at remotely pilot cellular processes in real-time with to leverage the biotechnological potential of synthetic biology. Yet, the control of only a small number of genetic circuits has been tested so far. Here we investigate the control of multistable gene regulatory networks, which are ubiquitously found in nature and play critical roles in cell differentiation and decision-making. Using an in silico feedback control loop, we demonstrate that a bistable genetic toggle switch can be dynamically maintained near its unstable equilibrium position for extended periods of time...
November 17, 2017: Nature Communications
https://www.readbyqxmd.com/read/29150244/proteomic-analysis-of-follicular-fluid-from-tropically-adapted-goats
#5
Alexandre R Paula Junior, Mauricio F van Tilburg, Marina D P Lobo, Ana C O Monteiro-Moreira, Renato A Moreira, Carlos H S Melo, Joanna M G Souza-Fabjan, Airton A Araújo, Luciana M Melo, Dárcio I A Teixeira, Arlindo A Moura, Vicente J F Freitas
The present study was conducted to characterize the major proteome of ovarian follicular fluid from locally-adapted, "Canindé" goats in the northeast of Brazil. Eight estrous cycling goats received a hormonal treatment consisting of medroxyprogesterone acetate, D-cloprostenol and FSH. Fluid was collected by laparoscopy from small (<3mm), medium (3-4mm) and large (>4mm) follicles and then, proteins were analyzed by 2-D SDS-PAGE and tandem mass spectrometry. Thirty-six proteins were identified in the goat follicular fluid, including albumin, immunoglobulins, ceruloplasmin, complement factor B, alpha-1B-glycoprotein precursor, serotransferrin, complement C3 and serpins, among others...
November 6, 2017: Animal Reproduction Science
https://www.readbyqxmd.com/read/29150077/unique-arginine-array-improves-cytosolic-localization-of-hydrocarbon-stapled-peptides
#6
Kim Quach, Jonathan LaRochelle, Xiao-Han Li, Elizabeth Rhoades, Alanna Schepartz
We have previously reported that miniature proteins containing a distinct array of 5 arginine residues on a folded α-helix - a penta-arg motif - traffic with high efficiency from endosomes into the cytosol and nucleus of mammalian cells. Here we evaluate whether a penta-arg motif can improve the intracellular trafficking of an otherwise impermeant hydrocarbon-stapled peptide, SAH-p53-4(Rho). We prepared a panel of SAH-p53-4(Rho) variants containing penta-arg sequences with different spacings and axial arrangement and evaluated their overall uptake (as judged by flow cytometry) and their intracellular access (as determined by fluorescence correlation spectroscopy, FCS)...
November 7, 2017: Bioorganic & Medicinal Chemistry
https://www.readbyqxmd.com/read/29149764/human-saliva-as-a-diagnostic-material
#7
REVIEW
Sylwia Chojnowska, Tomasz Baran, Iwona Wilińska, Paulina Sienicka, Iwona Cabaj-Wiater, Małgorzata Knaś
Today blood biochemical laboratory tests are essential elements to the diagnosis and monitoring of the treatment of diseases. However, many researchers have suggested saliva as an preferable diagnostic material. The collection of saliva is simple, painless, cheap and safe, both for patients and medical staff. An additional advantage of saliva is the fact that it may be retrieved several times a day, which makes repeat analysis much easier. Furthermore, saliva has very high durability. Although 94-99% of salivary content is water, saliva also contains numerous cellular elements and many organic and inorganic substances, including most biological markers present in the blood and urine that may be used in the early detection and monitoring of many dental and general diseases...
November 14, 2017: Advances in Medical Sciences
https://www.readbyqxmd.com/read/29149721/biological-safety-and-tissue-distribution-of-16-mercaptohexadecyl-trimethylammonium-bromide-modified-cationic-gold-nanorods
#8
Monika Zarska, Michal Sramek, Filip Novotny, Filip Havel, Andrea Babelova, Blanka Mrazkova, Oldrich Benada, Milan Reinis, Ivan Stepanek, Kamil Musilek, Jiri Bartek, Monika Ursinyova, Ondrej Novak, Rastislav Dzijak, Kamil Kuca, Jan Proska, Zdenek Hodny
The exceptionally high cellular uptake of gold nanorods (GNRs) bearing cationic surfactants makes them a promising tool for biomedical applications. Given the known specific toxic and stress effects of some preparations of cationic nanoparticles, the purpose of this study was to evaluate, in an in vitro and in vivo in mouse, the potential harmful effects of GNRs coated with (16-mercaptohexadecyl)trimethylammonium bromide ((MTAB)GNRs). Interestingly, even after cellular accumulation of high amounts of (MTAB)GNRs sufficient for induction of photothermal effect, no genotoxicity (even after longer-term accumulation), induction of autophagy, destabilization of lysosomes (dominant organelles of their cellular destination), alterations of actin cytoskeleton, or in cell migration could be detected in vitro...
November 1, 2017: Biomaterials
https://www.readbyqxmd.com/read/29149643/the-role-of-the-p38-activated-protein-kinase-signaling-pathway-mediated-autophagy-in-cadmium-exposed-monogonont-rotifer-brachious-koreanus
#9
Hye-Min Kang, Chang-Bum Jeong, Min-Sub Kim, Jin-Sol Lee, Jiaying Zhou, Young Hwan Lee, Duck-Hyun Kim, Eunyoung Moon, Hee-Seok Kweon, Su-Jae Lee, Jae-Seong Lee
Autophagy is a 'self-eating' system that regulates the degradation of cellular components and is involved in various biological processes including survival and development. However, despite its crucial role in organisms, the regulatory mechanism of autophagy remains largely unclear, particularly in invertebrates. In this study, conserved autophagy in the rotifer Brachionus koreanus in response to cadmium (Cd) exposure was verified by measuring acidic vesicle organelles using acridine orange (AO) and neutral red (NR) staining, and by detecting LC3 I/II on Western blot and immunofluorescence...
November 10, 2017: Aquatic Toxicology
https://www.readbyqxmd.com/read/29149479/cripsr-cas-expands-dynamic-range-of-gene-expression-from-t7rnap-promoters
#10
Sean R McCutcheon, Kwan Lun Chiu, Daniel D Lewis, Cheemeng Tan
BACKGROUND: Reducing leaky gene expression is critical for improving protein yield of recombinant bacteria and stability of engineered cellular circuits in synthetic biology. Leaky gene expression occurs when a genetic promoter is not fully repressed, leading to unintended protein synthesis in the absence of stimuli. Existing work has devised specific molecular strategies for reducing leaky gene expression of each promoter. Main Method and Results: In contrast, we describe a repurposed, modular CRISPRi system that attenuates leaky gene expression using a series of single-guide RNAs targeting the PT7/LacO1 ...
November 17, 2017: Biotechnology Journal
https://www.readbyqxmd.com/read/29149414/role-of-tctp-for-cellular-differentiation-and-cancer-therapy
#11
Ean-Jeong Seo, Nicolas Fischer, Thomas Efferth
The translationally controlled tumor protein (TCTP) is a highly conserved protein that is regulated due to a high number of extracellular stimuli. TCTP has an important role for cell cycle and normal development. On the other side, tumor reversion and malignant transformation have been associated with TCTP. TCTP has been found among the 12 genes that are differentially expressed during mouse oocyte maturation, and an overexpression of this gene was reported in a wide variety of different cancer types. Its antiapoptotic effect is indicated by the interaction with several proapoptotic proteins of the Bcl-2 family and the p53 tumor suppressor protein...
2017: Results and Problems in Cell Differentiation
https://www.readbyqxmd.com/read/29149412/the-translationally-controlled-tumor-protein-and-the-cellular-response-to-ionizing-radiation-induced-dna-damage
#12
Jie Zhang, Grace Shim, Sonia M de Toledo, Edouard I Azzam
The absorption of ionizing radiation by living cells can directly disrupt atomic structures, producing chemical and biological changes. It can also act indirectly through radiolysis of water, thereby generating reactive chemical species that may damage nucleic acids, proteins, and lipids. Together, the direct and indirect effects of radiation initiate a series of biochemical and molecular signaling events that may repair the damage or culminate in permanent physiological changes or cell death. In efforts to gain insight into the mechanisms underlying these effects, we observed a prominent upregulation of the Translationally Controlled Tumor Protein (TCTP) in low dose/low dose rate (137)Cs γ-irradiated cells that was associated with adaptive responses that reduced chromosomal damage to a level lower than what occurs spontaneously...
2017: Results and Problems in Cell Differentiation
https://www.readbyqxmd.com/read/29149407/roles-of-the-translationally-controlled-tumor-protein-tctp-in-plant-development
#13
Léo Betsch, Julie Savarin, Mohammed Bendahmane, Judit Szecsi
The Translationally Controlled Tumor Protein (TCTP) is a conserved protein which expression was associated with several biochemical and cellular functions. Loss-of-function mutants are lethal both in animals and in plants, making the identification of its exact role difficult. Recent data using the model plant Arabidopsis thaliana provided the first viable adult knockout for TCTP and helped addressing the biological role of TCTP during organ development and the functional conservation between plants and animals...
2017: Results and Problems in Cell Differentiation
https://www.readbyqxmd.com/read/29149405/current-understanding-of-the-tctp-interactome
#14
Siting Li, Feng Ge
Evolutionarily conserved and pleiotropic, the translationally controlled tumor protein (TCTP) is a housekeeping protein present in eukaryotic organisms. It plays an important role in regulating many fundamental processes, such as cell proliferation, cell death, immune responses, and apoptosis. As a result of the pioneer work by Adam Telerman and Robert Amson, the critical role of TCTP in tumor reversion was revealed. Moreover, TCTP has emerged as a regulator of cell fate determination and a promising therapeutic target for cancers...
2017: Results and Problems in Cell Differentiation
https://www.readbyqxmd.com/read/29149404/the-translational-controlled-tumour-protein-tctp-biological-functions-and-regulation
#15
Ulrich-Axel Bommer
The Translational Controlled Tumour Protein TCTP (gene symbol TPT1, also called P21, P23, Q23, fortilin or histamine-releasing factor, HRF) is a highly conserved protein present in essentially all eukaryotic organisms and involved in many fundamental cell biological and disease processes. It was first discovered about 35 years ago, and it took an extended period of time for its multiple functions to be revealed, and even today we do not yet fully understand all the details. Having witnessed most of this history, in this chapter, I give a brief overview and review the current knowledge on the structure, biological functions, disease involvements and cellular regulation of this protein...
2017: Results and Problems in Cell Differentiation
https://www.readbyqxmd.com/read/29149060/epigenetic-regulation-of-viral-biological-processes
#16
REVIEW
Lata Balakrishnan, Barry Milavetz
It is increasingly clear that DNA viruses exploit cellular epigenetic processes to control their life cycles during infection. This review will address epigenetic regulation in members of the polyomaviruses, adenoviruses, human papillomaviruses, hepatitis B, and herpes viruses. For each type of virus, what is known about the roles of DNA methylation, histone modifications, nucleosome positioning, and regulatory RNA in epigenetic regulation of the virus infection will be discussed. The mechanisms used by certain viruses to dysregulate the host cell through manipulation of epigenetic processes and the role of cellular cofactors such as BRD4 that are known to be involved in epigenetic regulation of host cell pathways will also be covered...
November 17, 2017: Viruses
https://www.readbyqxmd.com/read/29149020/role-of-transforming-growth-factor-%C3%AE-in-uterine-fibroid-biology
#17
REVIEW
Michał Ciebiera, Marta Włodarczyk, Małgorzata Wrzosek, Błażej Męczekalski, Grażyna Nowicka, Krzysztof Łukaszuk, Magdalena Ciebiera, Aneta Słabuszewska-Jóźwiak, Grzegorz Jakiel
Uterine fibroids (UFs) are benign tumors of the female genital tract made of the smooth muscle of the uterus. UF growth depends mostly on the influence of the steroid hormones and selected growth factors. Transforming growth factor β (TGF-βs) is a polypeptide that consists of three isoforms: TGF-β1, TGF-β2, and TGF-β3. At present, TGF-β is considered to be one of the key factors in the pathophysiology of UFs. It plays a major role in cellular migration within the tumor, stimulates tumor growth, and enhances tumor metabolism...
November 17, 2017: International Journal of Molecular Sciences
https://www.readbyqxmd.com/read/29148257/multiscale-memory-and-bioelectric-error-correction-in-the-cytoplasm-cytoskeleton-membrane-system
#18
REVIEW
Chris Fields, Michael Levin
A fundamental aspect of life is the modification of anatomy, physiology, and behavior in the face of changing conditions. This is especially illustrated by the adaptive regulation of growth and form that underlies the ability of most organisms-from single cells to complex large metazoa-to develop, remodel, and regenerate to specific anatomical patterns. What is the relationship of the genome and other cellular components to the robust computations that underlie this remarkable pattern homeostasis? Here we examine the role of constraints defined at the cellular level, especially endogenous bioelectricity, in generating and propagating biological information...
November 17, 2017: Wiley Interdisciplinary Reviews. Systems Biology and Medicine
https://www.readbyqxmd.com/read/29148176/differential-proteomic-analysis-reveals-protein-networks-and-pathways-that-may-contribute-to-helicobacter-pylori-fkbp-type-ppiase-associated-gastric-diseases
#19
Yanmei Zhu, Yuehua Gong, Aodi Li, Moye Chen, Dan Kang, Jun Liu, Yuan Yuan
PURPOSE: Though Helicobacter pylori (H. pylori) has been classified as class I carcinogen, key virulence factor generated by H. pylori that causes gastric cancer remains to be fully determined. Recently, we identified a gastric cancer-associated H. pylori gene, peptidylprolyl isomerase-FK506 binding protein (PPIase-FKBP), and showed that PPIase-FKBP was capable of inducing oncogenic transformation of gastric epithelial cells. But its mechanism was unclear. EXPERIMENTAL DESIGN: We carried out a comparative proteomic analysis of human gastric epithelial cells that either express PPIase-FKBP or green fluorescent protein (GFP) using two-dimensional (2-D) gel electrophoresis and then matrix-assisted laser desorption/ionization time of flight mass spectrometry (MALDI-TOF-MS/MS)...
November 16, 2017: Proteomics. Clinical Applications
https://www.readbyqxmd.com/read/29147993/preparation-and-characterization-of-gelatin-sericin-carboxymethyl-chitosan-medical-tissue-glue
#20
Min Liang, Zhenzhu Li, Cengceng Gao, Fuping Wang, Zhongmin Chen
BACKGROUND: The development and application of medical glue has been continuously expanding and advancing. However, there are few glues that combine low-cost with excellent biocompatibility. METHODS: We have prepared a medical tissue glue using a gelatin (Gel), sericin (SS) and carboxymethyl chitosan (CMCS) blend solution, cross-linked with 1-ethyl-3-(3-dimethylaminopropyl)-carbodiimide (EDC). The combination's characteristics and microstructure morphology were observed by Fourier transform infrared spectroscopy (FT-IR) and scanning electron microscope (SEM)...
November 16, 2017: Journal of Applied Biomaterials & Functional Materials
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