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Biochimie

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https://read.qxmd.com/read/31002843/metabolic-and-physiological-perturbations-of-escherichia-coli-w3100-by-bacterial-small-rna-ryhb
#1
Yu Lv, Jihui Wu, Yunyu Shi
RyhB is a key regulator of iron level in Escherichia coli (E. coli), which assists in conserving iron for life-sustaining cellular functions when cytoplasmic levels of the ferrous form of iron is limited. RyhB affects glucose metabolism. Seventy percent of the genes that are regulated by RyhB are related to metabolism. We demonstrated for the first time that the activity of the pentose phosphate pathway increased upon ryhB activation using a 13 C stable isotope-based technique called METAFoR (Metabolic flux ratio analysis)...
April 16, 2019: Biochimie
https://read.qxmd.com/read/31002842/tlr2-and-tlr4-mediate-an-activation-of-adipose-tissue-renin-angiotensin-system-induced-by-uric-acid
#2
Junxia Zhang, Bo Diao, Xue Lin, Jinxiu Xu, Feng Tang
Both hyperuricemia and adipose tissue renin-angiotensin system (RAS) are closely associated with multiple metabolic and cardiovascular diseases. We previously reported that uric acid could upregulate tissue RAS in adipocytes. In the present study, we aimed to reveal the involvement of toll-like receptors (TLRs) in uric acid-induced RAS activation in adipose tissue. A hyperuricemia rat model fed with a high-fructose diet and rat primary adipocytes were used in this study. Here, we inhibited TLR2 and TLR4 expression in adipose tissue and cultured adipocytes using small interfering RNA (siRNA)...
April 16, 2019: Biochimie
https://read.qxmd.com/read/30998968/up-regulation-of-microrna-496-suppresses-proliferation-invasion-migration-and-in-vivo-tumorigenicity-of-human-osteosarcoma-cells-by-targeting-eif4e
#3
Ni-Nan Qi, Shuo Tian, Xin Li, Fu-Li Wang, Bin Liu
Osteosarcoma is an aggressive bone tumor characterized by a high level of genetic instability and recurring DNA deletions and amplifications. This study aims to investigate how microRNA-496 (miR-496) affects proliferation, invasion, and migration of human osteosarcoma (OS) cells and in vivo tumorigenicity by targeting eukaryotic translation initiation factor 4E (eIF4E). Microarray-based gene expression profiling involving OS was used in order to identify differentially expressed genes. After that, the interaction between miR-496 expression and OS patients' survival rate was determined...
April 15, 2019: Biochimie
https://read.qxmd.com/read/30995540/crept-promotes-glioma-cell-proliferation-and-invasion-by-activating-wnt-%C3%AE-catenin-pathway-and-is-a-novel-target-of-microrna-596
#4
Minghao Wei, Yidong Cao, Dong Jia, Haikang Zhao, Liang Zhang
Cell cycle-related and expression elevated protein in tumor (CREPT) is emerging as a novel cancer-related gene that is dysregulated in many kinds of malignancies. However, the expression and biological role of CREPT in glioma remains unclear. In the present study, we aimed to explore the potential function and regulation mechanism of CREPT in glioma. Results showed that CRETP expression was significantly upregulated in glioma cell lines. Depletion of CREPT by siRNA-mediated gene silencing markedly decreased the proliferative and invasive capabilities of glioma cells...
April 14, 2019: Biochimie
https://read.qxmd.com/read/30995539/physiological-roles-of-antisense-rnas-in-prokaryotes
#5
REVIEW
Maxence Lejars, Asaki Kobayashi, Eliane Hajnsdorf
Prokaryotes encounter constant and often brutal modifications to their environment. In order to survive, they need to maintain fitness, which includes adapting their protein expression patterns. Many factors control gene expression but this review focuses on just one, namely antisense RNAs (asRNAs), a class of non-coding RNAs (ncRNAs) characterized by their location in cis and their perfect complementarity with their targets. asRNAs were considered for a long time to be trivial and only to be found on mobile genetic elements...
April 14, 2019: Biochimie
https://read.qxmd.com/read/30986434/-70-years-of-serotonin
#6
EDITORIAL
Francine Côté, Cathy Vaillancourt
No abstract text is available yet for this article.
April 12, 2019: Biochimie
https://read.qxmd.com/read/30981871/crataeva-tapia-bark-lectin-cratabl-is-a-chemoattractant-for-endothelial-cells-that-targets-heparan-sulfate-and-promotes-in-vitro-angiogenesis
#7
Fabricio Pereira Batista, Rodrigo Barbosa de Aguiar, Joana Tomomi Sumikawa, Yara Aparecida Lobo, Camila Ramalho Bonturi, Rodrigo Ferreira da Silva, Sheila Siqueira Andrade, Patricia Maria Guedes Paiva, Maria Tereza Dos Santos Correia, Carolina Meloni Vicente, Leny Toma, Misako Uemura Sampaio, Thaysa Paschoalin, Manoel João Batista Castello Girão, Jane Zveiter de Moraes, Cláudia Alessandra Andrade de Paula, Maria Luiza Vilela Oliva
Formation of new blood vessels from preexisting ones, a process known as angiogenesis, is one of the limiting steps for success in treatment of ischemic disorders. Therefore, efforts to understanding and characterize new agents capable to stimulate neovascularization are a worldwide need. Crataeva tapia bark lectin (CrataBL) has been shown to have chemoattractant properties for endothelial cells through the stimulation of migration and invasiveness of human umbilical vein endothelial cells (HUVEC) because it is a positively charged protein with high affinity to glycosaminoglycan...
April 11, 2019: Biochimie
https://read.qxmd.com/read/30980844/glut1-is-associated-with-sphingolipid-organized-cholesterol-independent-domains-in-l929-mouse-fibroblast-cells
#8
Lauren E Rylaarsdam, Grace N Johnecheck, Brendan D Looyenga, Larry L Louters
Glucose is a preferred metabolite in most mammalian cells, and proper regulation of uptake is critical for organism homeostasis. The glucose transporter 1 (GLUT1) is responsible for glucose uptake in a wide variety of cells and appears to be regulated in a tissue specific manner. Therefore, a better understanding of GLUT1 regulation within its various cellular environments is essential for developing therapeutic strategies to treat disorders associated with glucose homeostasis. Previous findings suggest that plasma membrane subdomains called lipid rafts may play a role in regulation of GLUT1 uptake activity...
April 10, 2019: Biochimie
https://read.qxmd.com/read/30978375/identification-of-a-peptide-derived-from-a-bothrops-moojeni-metalloprotease-with-in-vitro-inhibitory-action-on-the-plasmodium-falciparum-purine-nucleoside-phosphorylase-enzyme-pfpnp
#9
Gracianny Gomes Martins, Rudson de Jesus Holanda, Jorge Alfonso, Ana Fidelina Gómez Garay, Ana Paula de Azevedo Dos Santos, Anderson Maciel de Lima, Aleff Ferreira Francisco, Carolina Bioni Garcia Teles, Fernando Berton Zanchi, Andreimar Martins Soares
There is a growing need for research on new antimalarial agents against Plasmodium falciparum infection, especially in regards to planning molecular architecture for specific molecular targets of the parasite. Thus, a metalloprotease from Bothrops moojeni, known as BmooMPα-I, was explored in this study, through in silico assays, aiming at the development of a peptide generated from this molecule with potential inhibitory action on PfPNP, an enzyme necessary for the survival of the parasite. In order to isolate BmooMPα-I, cation exchange and reverse phase chromatographies were performed, followed by in vitro assays of antiparasitic activity against the W2 strain of P...
April 9, 2019: Biochimie
https://read.qxmd.com/read/30978374/in-vivo-assembly-of-eukaryotic-signal-recognition-particle-a-still-enigmatic-process-involving-the-smn-complex
#10
Séverine Massenet
The signal recognition particle (SRP) is a universally conserved non-coding ribonucleoprotein complex that is essential for targeting transmembrane and secretory proteins to the endoplasmic reticulum. Its composition and size varied during evolution. In mammals, SRP contains one RNA molecule, 7SL RNA, and six proteins: SRP9, 14, 19, 54, 68 and 72. Despite a very good understanding of the SRP structure and of the SRP assembly in vitro, how SRP is assembled in vivo remains largely enigmatic. Here we review current knowledge on how the 7SL RNA is assembled with core proteins to form functional RNP particles in cells...
April 9, 2019: Biochimie
https://read.qxmd.com/read/30965078/kinetics-of-inactivation-of-staphylolytic-enzymes-qualitative-and-quantitative-description
#11
Lyubov Filatova, David Donovan, Steven Swift, Vladimir Pugachev, Georgy Emelianov, Tatiana Chubar, Natalia Klaychko
Lysin 2638aR and chimeric Ply187AN-KSH3b fusion protein are capable of lysing antibiotic-resistant strains of Staphylococcus aureus and are promising alternatives to antibiotics. Studies on the stability and structure of lysins 2638aR and Ply187AN-KSH3b are important for assessing the feasibility of their practical use. Both lysins are highly active at physiological pH (7.5) and at low salt content (the concentration of NaCl in the reaction medium is not more than 250 mM). Lysins are inactivated by a monomolecular mechanism and have high stability at 4°C (storage temperature)...
April 6, 2019: Biochimie
https://read.qxmd.com/read/30959082/the-homeoprotein-msx1-cooperates-with-pkn1-to-prevent-terminal-differentiation-in-myogenic-precursor-cells
#12
Xiaoli Zhu, Mingrui Li, Xiang Jia, Wanwan Hou, Jiange Yang, Hui Zhao, Gang Wang, Jingqiang Wang
The homeoprotein Msx1 plays a critical role in embryonic patterning, particularly to maintain myogenic progenitor cell fate. However, the mechanisms underlying Msx1-mediated inhibition of myogenesis remain largely unknown. Here, we show that Msx1 cooperates with the protein kinase C-related kinase 1 (Pkn1), a member of the protein kinase C-related kinase family, to prevent the terminal differentiation of myogenic precursor cells. In mouse C2C12 cells, Pkn1 knockout partly impaired Msx1-mediated inhibition of myogenic differentiation, indicating a role for Pkn1 in this process...
April 5, 2019: Biochimie
https://read.qxmd.com/read/30959081/suppression-in-advanced-glycation-adducts-of-human-serum-albumin-by-bio-enzymatically-synthesized-gold-and-silver-nanoformulations-a-potential-tool-to-counteract-hyperglycemic-condition
#13
Faizan Ahmed, Qayyum Husain
Advanced glycation end-products (AGEs) from non-enzymatic glycation are implicated in several degenerative diseases, including being a crucial contributor in secondary complications of diabetes. This has garnered significant scientific interest in inhibiting agents of AGEs to prevent and remediate disorders arising due to glycation. In the current study, inhibitory effects on AGEs formation were investigated using bio-enzymatically synthesized nanoformulations of gold (AuNPs) and silver (AgNPs) by physiologically important enzyme, β galactosidase...
April 5, 2019: Biochimie
https://read.qxmd.com/read/30954547/the-apoptosis-and-glp-1-hyposecretion-induced-by-lps-via-rip-ros-mtor-pathway-in-glutag-cells
#14
Jiao Wang, Xiang Wang, Zhi-Zhen Li, Feng Guo, Cheng-Zhi Ding, Yan-Yan Zhao, Yan-Ling Liu, Xiao-Jun Ma, Chong Li, Li-Na Wu, Qian Qin, Shui-Ying Zhao, Di Zhao, Xiao Hao, Shou-Jun Wang, Gui-Jun Qin
Lipopolysaccharide (LPS) as a component of the outer structure of cell wall of gram-negative bacteria, could induce apoptosis in the intestinal endocrine cell line STC-1. However, the signaling cascades involved in this process have not been elucidated. Hence, we investigated the mechanism of cell apoptosis and hyposecretion of glucagon-like peptide 1 (GLP-1) induced by LPS in the GLUTag enteroendocrine cell line. LPS decreased the cell viability of GLUTag cells, up-regulated the TNF-α level, induced the apoptosis and down-regulated the mRNA and protein levels of GLP-1...
April 4, 2019: Biochimie
https://read.qxmd.com/read/30953672/serotonin-and-orthodontic-tooth-movement
#15
REVIEW
Thomas Dhenain, Francine Côté, Tereza Coman
Peripheral serotonin continuously reveals its unexpected involvements in many organ functions. In bone tissue, there is an increasing evidence for a local serotonergic system affecting the cellular and molecular actors involved in bone turnover. During orthodontic treatment, tooth movement relies on bone remodeling, itself a result of the inflammatory process triggered by application of orthodontic forces to the teeth. Nowadays, many adults proceed to an orthodontic treatment, it therefore seems important to consider physiological growth-related factors and external factors as medications that may influence adverse effects and efficacy of orthodontic treatment techniques...
April 3, 2019: Biochimie
https://read.qxmd.com/read/30946949/serotonin-estrogen-interactions-what-can-we-learn-from-pregnancy
#16
REVIEW
Andrée-Anne Hudon Thibeault, J Thomas Sanderson, Cathy Vaillancourt
We have reviewed the scientific literature related to four diseases in which to serotonin (5-HT) is involved in the etiology, herein named 5-HT-linked diseases, and whose prevalence is influenced by estrogenic status: depression, migraine, irritable bowel syndrome and eating disorders. These diseases all have in common a sex-dimorphic prevalence, with women more frequently affected than men. The co-occurrence between these 5-HT-linked diseases suggests that they have common physiopathological mechanisms. In most 5-HT-linked diseases (except for anorexia nervosa and irritable bowel syndrome), a decrease in the serotonergic tone is observed and estrogens are thought to contribute to the improvement of symptoms by stimulating the serotonergic system...
April 1, 2019: Biochimie
https://read.qxmd.com/read/30946948/repurposing-of-auranofin-thioredoxin-reductase-remains-a-primary-target-of-the-drug
#17
Xiaonan Zhang, Karthik Selvaraju, Amir Ata Saei, Padraig D'Arcy, Roman A Zubarev, Elias Sj Arnér, Stig Linder
Auranofin is a gold (I)-containing compound used for the treatment of rheumatic arthritis. Auranofin has anticancer activity in animal models and is approved for clinical trials for lung and ovarian carcinomas. Both the cytosolic and mitochondrial forms of the selenoprotein thioredoxin reductase (TrxR) are well documented targets of auranofin. Auranofin was recently reported to inhibit proteasome activity at the level of the proteasome-associated deubiquitinases (DUBs) UCHL5 and USP14. We here set out to re-examine the molecular mechanism underlying auranofin cytotoxicity towards cultured cancer cells...
April 1, 2019: Biochimie
https://read.qxmd.com/read/30946947/biochemical-and-molecular-characterization-of-the-hyaluronidase-from-bothrops-atrox-peruvian-snake-venom
#18
Dan E Vivas-Ruiz, Edgar E Gonzalez-Kozlova, Julio Delgadillo, Pedro M Palermo, Gustavo A Sandoval, Fanny Lazo, Edith Rodríguez, Carlos Chávez-Olórtegui, Armando Yarlequé, Eladio F Sanchez
Snake venoms are a rich source of enzymes such as metalloproteinases, serine proteinases phospholipases A2 and myotoxins, that have been well characterized structurally and functionally. However, hyaluronidases (E.C.3.2.1.35) have not been studied extensively. In this study, we describe the biochemical and molecular features of a hyaluronidase (Hyal-Ba) isolated from the venom of the Peruvian snake Bothrops atrox. Hyal-Ba was purified by a combination of ion-exchange and gel filtration chromatography. Purified Hyal-Ba is a 69-kDa (SDS-PAGE) monomeric glycoprotein with an N-terminal amino acid sequence sharing high identity with homologous snake venom hyaluronidases...
April 1, 2019: Biochimie
https://read.qxmd.com/read/30946946/an-ancient-mechanism-of-arginine-specific-substrate-cleavage-what-s-up-with-nsp4
#19
REVIEW
Andrew P AhYoung, S Jack Lin, Stefan Gerhardy, Menno van Lookeren Campagne, Daniel Kirchhofer
The recently discovered neutrophil serine protease 4 (NSP4) is the fourth member of the NSP family, which includes the well-studied neutrophil elastase, proteinase 3 and cathepsin G. Like the other three NSP members, NSP4 is synthesized by myeloid precursors in the bone marrow and, after cleavage of the two-amino acid activation peptide, is stored as an active protease in azurophil granules of neutrophils. Based on its primary amino acid sequence, NSP4 is predicted to have a shallow S1 specificity pocket with elastase-like substrate specificity...
April 1, 2019: Biochimie
https://read.qxmd.com/read/30940603/design-of-cross-linked-rna-protein-complexes-for-structural-studies
#20
Clément Dégut, Veronika Schwarz, Luc Ponchon, Pierre Barraud, Ronald Micura, Carine Tisné
Crystallographic studies of RNA/protein complexes are primordial for the understanding of recognition determinants and catalytic mechanisms in the case of enzymes. However, due to the flexibility and propensity to conformational heterogeneity of RNAs, as well as the mostly electrostatic interactions of RNA/protein complexes, they are difficult to crystallize. We present here a method to trap the two interacting partners in a covalent complex, based on a modified reactive RNA allowing the use of the full range of common crystallogenesis tools...
March 30, 2019: Biochimie
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