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https://www.readbyqxmd.com/read/28209400/multidrug-resistant-enterococcal-infections-new-compounds-novel-antimicrobial-therapies
#1
REVIEW
Roel M van Harten, Rob J L Willems, Nathaniel I Martin, Antoni P A Hendrickx
Over the past two decades infections due to antibiotic-resistant bacteria have escalated world-wide, affecting patient morbidity, mortality, and health care costs. Among these bacteria, Enterococcus faecium and Enterococcus faecalis represent opportunistic nosocomial pathogens that cause difficult-to-treat infections because of intrinsic and acquired resistance to a plethora of antibiotics. In recent years, a number of novel antimicrobial compound classes have been discovered and developed that target Gram-positive bacteria, including E...
February 13, 2017: Trends in Microbiology
https://www.readbyqxmd.com/read/28205545/octreotide-attenuates-acute-kidney-injury-after-hepatic-ischemia-and-reperfusion-by-enhancing-autophagy
#2
Huiping Sun, Shuangfa Zou, Keith A Candiotti, Yanhua Peng, Qinya Zhang, Weiqiang Xiao, Yiyun Wen, Jiao Wu, Jinfeng Yang
Octreotide exerts a protective effect in hepatic ischemia-reperfusion (HIR) injury. However, whether octreotide preconditioning could also reduce acute kidney injury (AKI) after HIR is unknown. This study was designed to investigate the role of octreotide in AKI after HIR. Male Sprague-Dawley rats were pretreated with octreotide or octreotide combined with 3-methyladenine (autophagy inhibitor, 3MA). Plasma creatinine, inflammation markers (e.g., TNF-α and IL-6 etc.), apoptosis, autophagy and phosphorylation of protein kinase B/mammalian target of rapamycin/p70 ribosomal S6 kinase (Akt/mTOR/p70S6K) in the kidney were measured after 60 minutes of liver ischemia and 24 hours of reperfusion for each rat...
February 16, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28194024/regnase-1-a-rapid-response-ribonuclease-regulating-inflammation-and-stress-responses
#3
REVIEW
Renfang Mao, Riyun Yang, Xia Chen, Edward W Harhaj, Xiaoying Wang, Yihui Fan
RNA-binding proteins (RBPs) are central players in post-transcriptional regulation and immune homeostasis. The ribonuclease and RBP Regnase-1 exerts critical roles in both immune cells and non-immune cells. Its expression is rapidly induced under diverse conditions including microbial infections, treatment with inflammatory cytokines and chemical or mechanical stimulation. Regnase-1 activation is transient and is subject to negative feedback mechanisms including proteasome-mediated degradation or mucosa-associated lymphoid tissue 1 (MALT1) mediated cleavage...
February 13, 2017: Cellular & Molecular Immunology
https://www.readbyqxmd.com/read/28192480/mtor-activity-in-aids-related-diffuse-large-b-cell-lymphoma
#4
Sara H Browne, Julio A Diaz-Perez, Michael Preziosi, Charles C King, George A Jones, Sonia Jain, Xiaoying Sun, Erin G Reid, Scott VandenBerg, Huan-You Wang
BACKGROUND: Patients infected with HIV have a significantly increased risk of developing non-Hodgkin lymphomas despite the widespread use of HAART. To investigate mTOR pathway activity in acquired immunodeficiency syndrome (AIDS) related diffuse large B-cell lymphoma AR-DLBCL, we used immunohistochemistry to examine the presence of the phosphorylated 70 ribosomal S6 protein-kinase (p70S6K), an extensively studied effector of mTOR Complex 1 (mTORC1) and the phosphorylated phosphatase and tensin homolog (pPTEN), a negative regulator of mTORC1 pathway...
2017: PloS One
https://www.readbyqxmd.com/read/28170113/helicoverpa-zea-gut-associated-bacteria-indirectly-induce-defenses-in-tomato-by-triggering-a-salivary-elicitor-s
#5
Jie Wang, Michelle Peiffer, Kelli Hoover, Cristina Rosa, Rensen Zeng, Gary W Felton
Insect gut-associated microbes modulating plant defenses have been observed in beetles and piercing-sucking insects, but the role of caterpillar-associated bacteria in regulating plant induced defenses has not been adequately examined. We identified bacteria from the regurgitant of field-collected Helicoverpa zea larvae using 16S ribosomal RNA (rRNA) gene sequencing and matrix-assisted laser desorption/ionization time of flight (MALDI-TOF) mass spectrometry. A combination of biochemical, molecular, and confocal electron microscopy methods were used to determine the role of caterpillar-associated bacteria in mediating defenses in Solanum lycopersicum (tomato)...
February 7, 2017: New Phytologist
https://www.readbyqxmd.com/read/28164609/anti-cytoplasmic-autoantibodies-in-hodgkin-s-lymphoma
#6
Joachim Sennekamp, Hans-Peter Seelig
BACKGROUND: A 42-year old male patient with anamnesis of bronchial asthma presented himself with exertional dyspnea. High titer antibodies of cytoplasmic pattern in the indirect immunofluorescence test (IIFT) on HEp-2cells, not attributable to common specificities like anti-tRNA-synthetases, anti-signal recognition particle (SRP) or anti-ribosomal proteins (RPs) prompted the molecular biological approach for determination of antigen specificity. In-depth investigation of the patient's clinical settings revealed a lymphocyte predominant Hodgkin's lymphoma, which could be brought to complete remission by chemotherapy...
August 1, 2016: Clinical Laboratory
https://www.readbyqxmd.com/read/28150900/discovery-of-antimicrobial-and-antitubercular-molecules-from-fusarium-solani-an-endophyte-of-glycyrrhiza-glabra
#7
Aiyatullah Shah, Muzafar Ahmad Rather, Parvaiz H Qazi, Mushtaq A Aga, Saleem Mushtaq, Aabid Manzoor Shah, Aehtesham Hussain, Shoib A Baba, Zahoor Ahmad
AIM: Glycyrrhiza glabra is a high value medicinal plant thriving in biodiversity rich Kashmir Himalaya. The present study was designed to explore the fungal endophytes from G glabra as a source of bioactive molecules. METHODS AND RESULTS: The extracts prepared from the isolated endophytes were evaluated for antimicrobial activities using broth micro-dilution assay. The endophytic strain coded as A2 exhibiting promising antibacterial as well as antituberculosis activity was identified as Fusarium solani by ITS-5...
February 2, 2017: Journal of Applied Microbiology
https://www.readbyqxmd.com/read/28100663/leveraging-genome-wide-datasets-to-quantify-the-functional-role-of-the-anti-shine-dalgarno-sequence-in-regulating-translation-efficiency
#8
Adam J Hockenberry, Adam R Pah, Michael C Jewett, Luís A N Amaral
Studies dating back to the 1970s established that sequence complementarity between the anti-Shine-Dalgarno (aSD) sequence on prokaryotic ribosomes and the 5' untranslated region of mRNAs helps to facilitate translation initiation. The optimal location of aSD sequence binding relative to the start codon, the full extents of the aSD sequence and the functional form of the relationship between aSD sequence complementarity and translation efficiency have not been fully resolved. Here, we investigate these relationships by leveraging the sequence diversity of endogenous genes and recently available genome-wide estimates of translation efficiency...
January 2017: Open Biology
https://www.readbyqxmd.com/read/28100093/p19-targeted-abd-derived-protein-variants-inhibit-il-23-binding-and-exert-suppressive-control-over-il-23-stimulated-expansion-of-primary-human-il-17-t-cells
#9
Lucie Křížová, Milan Kuchař, Hana Petroková, Radim Osička, Marie Hlavničková, Ondřej Pelák, Jiří Černý, Tomáš Kalina, Petr Malý
Interleukin-23 (IL-23), a heterodimeric cytokine of covalently bound p19 and p40 proteins, has recently been closely associated with development of several chronic autoimmune diseases such as psoriasis, psoriatic arthritis or inflammatory bowel disease. Released by activated dendritic cells, IL-23 interacts with IL-23 receptor (IL-23R) on Th17 cells, thus promoting intracellular signaling, a pivotal step in Th17-driven pro-inflammatory axis. Here, we aimed to block the binding of IL-23 cytokine to its cell-surface receptor by novel inhibitory protein binders targeted to the p19 subunit of human IL-23...
January 19, 2017: Autoimmunity
https://www.readbyqxmd.com/read/28079801/acute-necrotizing-retinal-vasculitis-as-onset-of-systemic-lupus-erythematosus-a-case-report
#10
Simeon Monov, Ruska Hristova, Rositza Dacheva, Reni Toncheva, Russka Shumnalieva, Viara Shoumnalieva-Ivanova, Daniela Monova
RATIONALE: Systemic lupus erythematosus (SLE) is a complex autoimmune disease characterized by autoantibody production, complement activation, and deposition of immune complexes in tissues and organs. SLE can involve any region of the visual system. Although ocular manifestations are not part of the classification criteria for SLE, they can be observed in up to one-third of the patients with SLE. They are rarely reported at the time of disease onset. Retinal vasculitis is usually associated with active generalized disease...
January 2017: Medicine (Baltimore)
https://www.readbyqxmd.com/read/28060517/thermodynamics-of-helix-coil-transitions-of-polyalanine-in-open-carbon-nanotubes
#11
Dylan Suvlu, Seneviratne Samaratunga, D Thirumalai, Jayendran C Rasaiah
Understanding structure formation in polypeptide chains and synthetic polymers encapsulated in pores is important in biology and nanotechnology. We present replica exchange molecular dynamics studies of the phase diagram for α-helix formation of capped polyalanine in nanotubes (NT) open to a water reservoir as a function of the NT diameter and hydrophobicity. A helix forms only in a narrow range of diameters, which surprisingly is comparable to the width of the ribosome tunnel. Increasing the hydrophobicity enhances helicity in the NT...
January 19, 2017: Journal of Physical Chemistry Letters
https://www.readbyqxmd.com/read/28003804/golden-needle-mushroom-a-culinary-medicine-with-evidenced-based-biological-activities-and-health-promoting-properties
#12
REVIEW
Calyn Tang, Pearl Ching-Xin Hoo, Loh Teng-Hern Tan, Priyia Pusparajah, Tahir Mehmood Khan, Learn-Han Lee, Bey-Hing Goh, Kok-Gan Chan
Flammulina velutipes (enoki, velvet shank, golden needle mushroom or winter mushroom), one of the main edible mushrooms on the market, has long been recognized for its nutritional value and delicious taste. In recent decades, research has expanded beyond detailing its nutritional composition and delved into the biological activities and potential health benefits of its constituents. Many bioactive constituents from a range of families have been isolated from different parts of the mushroom, including carbohydrates, protein, lipids, glycoproteins, phenols, and sesquiterpenes...
2016: Frontiers in Pharmacology
https://www.readbyqxmd.com/read/28003488/ribosome-profiling-reveals-translational-upregulation-of-cellular-oxidative-phosphorylation-mrnas-during-vaccinia-virus-induced-host-shutoff
#13
Aimei Dai, Shuai Cao, Pragyesh Dhungel, Yizhao Luan, Yizhi Liu, Zhi Xie, Zhilong Yang
: Vaccinia virus infection causes a host shutoff, which is marked by global inhibition of host protein synthesis. Though the host shutoff may facilitate reallocation of cellular resources for viral replication and evasion of host anti-viral immune responses, it poses a challenge for continuous synthesis of cellular proteins that are important for viral replication. It is, however, unclear whether and how certain cellular proteins may be selectively synthesized during the vaccinia virus-induced host shutoff...
December 21, 2016: Journal of Virology
https://www.readbyqxmd.com/read/27999336/debouganin-diabody-fusion-protein-overcomes-drug-resistance-to-adcs-comprised-of-anti-microtubule-agents
#14
Shilpa Chooniedass, Rachelle L Dillon, Arjune Premsukh, Peter J Hudson, Gregory P Adams, Glen C MacDonald, Jeannick Cizeau
Antibody drug conjugates (ADC), comprised of highly potent small molecule payloads chemically conjugated to a full-length antibody, represent a growing class of therapeutic agents. The targeting of cytotoxic payloads via the specificity and selectivity of the antibody has led to substantial clinical benefits. However, ADC potency can be altered by mechanisms of resistance such as overexpression of efflux pumps or anti-apoptotic proteins. DeBouganin is a de-immunized variant of bouganin, a ribosome-inactivating protein (RIP) that blocks protein synthesis, thereby leading to apoptosis...
December 17, 2016: Molecules: a Journal of Synthetic Chemistry and Natural Product Chemistry
https://www.readbyqxmd.com/read/27997894/zedoarondiol-inhibits-platelet-derived-growth-factor-induced-vascular-smooth-muscle-cells-proliferation-via-regulating-amp-activated-protein-kinase-signaling-pathway
#15
Huimin Mao, Tianqi Tao, Dandan Song, Mi Liu, Xiaoren Wang, Xiuhua Liu, Dazhuo Shi
BACKGROUND/AIMS: Vascular smooth muscle cells (VSMCs) proliferation contributes significantly to atherosclerosis and in-stent restenosis. Platelet-derived growth factor-BB (PDGF-BB) plays a vital role in VSMCs proliferation. Zedoarondiol, a sesquiterpene lactone compound, has an anti-inflammatory activity. However, the role of zedoarondiol in PDGF-BB-mediated VSMCs proliferation remains unclear. In this study, we investigated the effects of zedoarondiol on PDGF-BB-induced VSMCs proliferation and explored the possible mechanisms...
2016: Cellular Physiology and Biochemistry
https://www.readbyqxmd.com/read/27992588/site-specific-cleavage-of-ribosomal-rna-in-escherichia-coli-based-cell-free-protein-synthesis-systems
#16
Jurek Failmezger, Robert Nitschel, Andrés Sánchez-Kopper, Michael Kraml, Martin Siemann-Herzberg
Cell-free protein synthesis, which mimics the biological protein production system, allows rapid expression of proteins without the need to maintain a viable cell. Nevertheless, cell-free protein expression relies on active in vivo translation machinery including ribosomes and translation factors. Here, we examined the integrity of the protein synthesis machinery, namely the functionality of ribosomes, during (i) the cell-free extract preparation and (ii) the performance of in vitro protein synthesis by analyzing crucial components involved in translation...
2016: PloS One
https://www.readbyqxmd.com/read/27928909/using-proteomics-to-discover-novel-biomarkers-for-fatty-liver-development-and-response-to-cb1r-antagonist-treatment-in-an-obese-mouse-model
#17
Chin-Chang Chen, Tzung-Yan Lee, Ching-Fai Kwok, Yung-Pei Hsu, Kuang-Chung Shih, Yan-Jie Lin, Low-Tone Ho
Over activity of cannabinoid receptor type 1 (CB1R) plays a key role in increasing the incidence of obesity-induced non-alcoholic fatty liver disease. Tissue proteome analysis has been applied to investigate the bioinformatics regarding the mode of action and therapeutic mechanism. The aim of this study was to explore the potential pathways altered with CB1R in obesity-induced fatty liver. Male C57BL/6 mice were fed either a standard chow diet (STD) or a high-fat diet (HFD) with or without 1-week treatment of CB1R inverse agonist AM251 at 5 mg/kg...
January 2017: Proteomics
https://www.readbyqxmd.com/read/27899592/an-mrna-specific-trnai-carrier-eif2a-plays-a-pivotal-role-in-cell-proliferation-under-stress-conditions-stress-resistant-translation-of-c-src-mrna-is-mediated-by-eif2a
#18
Oh Sung Kwon, Sihyeon An, Eunah Kim, Jinbae Yu, Ka Young Hong, Jae Seung Lee, Sung Key Jang
c-Src, a non-receptor protein tyrosine kinase, activates NF-κB and STAT3, which in turn triggers the transcription of anti-apoptosis- and cell cycle-related genes. c-Src protein regulates cell proliferation, cell motility and programmed cell death. And the elevated level of activated c-Src protein is related with solid tumor generation. Translation of c-Src mRNA is directed by an IRES element which mediates persistent translation under stress conditions when translation of most mRNAs is inhibited by a phosphorylation of the alpha subunit of eIF2 carrying the initiator tRNA (tRNAi) to 40S ribosomal subunit under normal conditions...
January 9, 2017: Nucleic Acids Research
https://www.readbyqxmd.com/read/27895729/celastrus-orbiculatus-extract-triggers-apoptosis-and-autophagy-via-pi3k-akt-mtor-inhibition-in-human-colorectal-cancer-cells
#19
Lin Yang, Yanqing Liu, Mei Wang, Yayun Qian, Xiaojun Dai, Yaodong Zhu, Jue Chen, Shiyu Guo, Tadashi Hisamitsu
Celastrus orbiculatus is used as a folk medicine in China for the treatment of numerous diseases. The ethyl acetate extract of Celastrus orbiculatus (COE) also displays a wide range of anti-cancer activities in the laboratory. However, the effectiveness of COE-induced autophagy and its mechanism of action in colorectal cancer cells have not been investigated thus far. The present study analyzed the effect of COE on HT-29 cell viability, apoptosis and autophagy using MTT assay, flow cytometry, transmission electron microscopy and western blotting...
November 2016: Oncology Letters
https://www.readbyqxmd.com/read/27895634/cytosolic-proteome-profiling-of-aminoglycosides-resistant-mycobacterium-tuberculosis-clinical-isolates-using-maldi-tof-ms
#20
Divakar Sharma, Manju Lata, Rananjay Singh, Nirmala Deo, Krishnamurthy Venkatesan, Deepa Bisht
Emergence of extensively drug resistant tuberculosis (XDR-TB) is the consequence of the failure of second line TB treatment. Aminoglycosides are the important second line anti-TB drugs used to treat the multi drug resistant tuberculosis (MDR-TB). Main known mechanism of action of aminoglycosides is to inhibit the protein synthesis by inhibiting the normal functioning of ribosome. Primary target of aminoglycosides are the ribosomal RNA and its associated proteins. Various mechanisms have been proposed for aminoglycosides resistance but still some are unsolved...
2016: Frontiers in Microbiology
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