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Biochemical and Biophysical Research Communications

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https://www.readbyqxmd.com/read/29353044/bmp4-signaling-in-npcs-upregulates-bcl-xl-to-promote-their-survival-in-the-presence-of-fgf-2
#1
Hanako Yamamoto, Masashi Kurachi, Masae Naruse, Koji Shibasaki, Yasuki Ishizaki
We previously reported that BMP4 does not promote proliferation or differentiation of CD44-positive astrocyte precursor cells (APCs) but greatly promotes their survival in the presence of fibroblast growth factor-2 (FGF-2). In this study, we examined if BMP4 acts as a survival factor also for neural stem/progenitor cells (NPCs) isolated from ganglionic eminence of neonatal mouse brain. We found BMP4 promotes survival but not proliferation or differentiation of these cells, just as in the case for CD44-positive APCs...
January 15, 2018: Biochemical and Biophysical Research Communications
https://www.readbyqxmd.com/read/29353043/progression-of-vasogenic-edema-induced-by-activated-microglia-under-permanent-middle-cerebral-artery-occlusion
#2
Miki Tanaka, Yasuhiro Ishihara, Shodo Mizuno, Atsuhiko Ishida, Christoph F Vogel, Mayumi Tsuji, Takeshi Yamazaki, Kouichi Itoh
Brain edema is a severe complication that accompanies ischemic stroke. Increasing evidence shows that inflammatory cytokines impair tight junctions of the blood-brain barrier, suggesting the involvement of microglia in brain edema. In this study, we examined the role of microglia in the progression of ischemic brain edema using mice with permanent middle cerebral artery occlusion. The intensity of T2-weighted imaging (T2WI) in the cerebral cortex and the striatum was elevated 3 h after occlusion and spread to peripheral regions of the ischemic hemisphere...
January 15, 2018: Biochemical and Biophysical Research Communications
https://www.readbyqxmd.com/read/29353042/ginkgolic-acid-induces-interplay-between-apoptosis-and-autophagy-regulated-by-ros-generation-in-colon-cancer
#3
Yuxia Liu, Bin Yang, Lirong Zhang, Xianling Cong, Zhen Liu, Yu Hu, Jing Zhang, Haixia Hu
Presently, developing effective anti-colon cancer drugs still remains to be important. Ginkgolic acids (GA), as a botanical drug extracted from the seed coat of Ginkgo biloba L., possess various bioactive properties. Our findings, for the first time, indicated that GA suppressed colon cancer cell proliferation, migration and invasion. GA led to cell death through G0/G1 phase arrest. In addition, apoptosis was significantly induced by GA treatment. The intrinsic apoptosis pathway was included, proved by the release of cytochrome c (Cyto-c) from the mitochondria into the cytosol...
January 15, 2018: Biochemical and Biophysical Research Communications
https://www.readbyqxmd.com/read/29353041/fads2-inhibition-in-essential-fatty-acid-deficiency-induces-hepatic-lipid-accumulation-via-impairment-of-very-low-density-lipoprotein-vldl-secretion
#4
Yuri Hayashi, Ayano Shimamura, Tomoko Ishikawa, Yoko Fujiwara, Ikuyo Ichi
Fatty acid desaturase 2 (FADS2) is responsible for the first desaturation reaction in the synthesis of highly unsaturated fatty acids (HUFAs), such as arachidonic acid (20:4n-6) and eicosapentaenoic acid (20:5n-3), and is involved in Mead acid (20:3n-9) production during essential fatty acid deficiency (EFAD). In this study, an obvious hepatic lipid accumulation was observed in EFAD mice treated with a FADS2 inhibitor. FADS2 inhibition in the EFAD state reduced secretion of very low-density lipoprotein (VLDL) and markedly diminished Mead acid in phosphatidylcholine (PC) in the liver and plasma...
January 15, 2018: Biochemical and Biophysical Research Communications
https://www.readbyqxmd.com/read/29353040/eupatilin-an-activator-of-ppar%C3%AE-inhibits-the-development-of-oxazolone-induced-atopic-dermatitis-symptoms-in-balb-c-mice
#5
Yujung Jung, Jin-Chul Kim, No-June Park, Sim-Kyu Bong, Sullim Lee, Hyun Jegal, Li Tai Jin, Sang Moo Kim, Yong Kee Kim, Su-Nam Kim
Eupatilin (5,7-dihydroxy-3',4',6-trimethoxyflavone) is the main lipophilic flavonoid obtained from the Artemisia species. Eupatilin has been reported to have anti-apoptotic, anti-oxidative and anti-inflammatory activities. Previously, we found that eupatilin increases transcriptional activity and expression of peroxisome proliferator-activated receptor α (PPARα) in a keratinocyte cell line and acts as an agonist of PPARα. PPARα agonists ameliorate atopic dermatitis (AD) and restore the skin barrier function...
January 15, 2018: Biochemical and Biophysical Research Communications
https://www.readbyqxmd.com/read/29353039/cetylpyridinium-chloride-as-a-novel-inhibitor-of-hepatitis-b-viral-capsid-assembly
#6
Hyun Wook Seo, Joon Pyung Seo, Yoon Jun Kim, Guhung Jung
Hepatitis B virus (HBV) infection is a major risk factor for chronic liver disease, cirrhosis, and hepatocellular carcinoma (HCC) worldwide. While multiple hepatitis B drugs have been developed, development of drug resistance during treatment or weak efficacies observed in some cases have limited their application. Therefore, there is an urgent need to develop better pharmacological agents for HBV-infected individuals. Here, we identified cetylpyridinium chloride (CPC) as a novel inhibitor of HBV. Using computational analysis of CPC-nucleocapsid proteins, microscale thermophoresis analysis of CPC binding to viral nucleocapsids, and in vitro nucleocapsid formation assays, we found that CPC interacts with dimeric viral nucleocapsid protein (known as core protein or HBcAg)...
January 15, 2018: Biochemical and Biophysical Research Communications
https://www.readbyqxmd.com/read/29353038/cereblon-crbn-deletion-reverses-streptozotocin-induced-diabetic-osteoporosis-in-mice
#7
Cong Yao, Xiong Guo, Wan-Xia Yao, Chun Zhang
Diabetes mellitus is a major cause to induce osteoporosis. Though the pathogenesis of osteoporosis progression has been well investigated, its still not fully understood. Recently, cereblon (CRBN) was considered as a negative modulator of adenosine monophosphate-activated protein kinase (AMPK) in vitro and in vivo. Here, we presented results indicating that CRBN could effectively regulate osteoporosis development. In STZ-induced wild type (WT) mice with diabetes, the osteoclasts were highly increased along with the deterioration of bone structure...
January 15, 2018: Biochemical and Biophysical Research Communications
https://www.readbyqxmd.com/read/29353037/curcumin-protects-cortical-neurons-against-oxygen-and-glucose-deprivation-reoxygenation-injury-through-flotillin-1-and-extracellular-signal-regulated-kinase1-2-pathway
#8
Zhengyu Lu, Yanping Liu, Yang Shi, Xinjie Shi, Xin Wang, Chuan Xu, Hong Zhao, Qiang Dong
In this study, we provided evidence that curcumin could be a promising therapeutic agent for ischemic stroke by activating neuroprotective signaling pathways. Post oxygen and glucose deprivation/reoxygenation (OGD/R), primary mouse cortical neurons treated with curcumin exhibited a significant decrease in cell death, LDH release and enzyme caspase-3 activity under OGD/R circumstances, which were abolished by flotillin-1 downregulation or extracellular signal-regulated kinase (ERK) inhibitor. Moreover, flotillin-1 knockdown led to suppression of curcumin-mediated ERK phosphorylation under OGD/R condition...
January 15, 2018: Biochemical and Biophysical Research Communications
https://www.readbyqxmd.com/read/29353036/nmr-based-serum-metabolomics-study-reveals-a-innovative-diagnostic-model-for-missed-abortion
#9
Zhenghong Wu, Lei Jin, Wenyi Zheng, Chenxi Zhang, Liwen Zhang, Yaping Chen, Junhua Guan, He Fei
A missed abortion (MA) is an in-utero death of the embryo or fetus before the 20th week of gestation with retained products of conception. In order to discover novel biomarkers for MA, a 1H NMR spectroscopy-based metabolomics approach was applied to detect human MA serum metabolic profiles. Serum samples were obtained from patients with MA (n = 15) and healthy controls (n = 9) for study. The NOESYPR1D spectrum combined with multi-variate pattern recognition analysis was used to cluster the groups and establish a disease-specific metabolites phenotype...
January 15, 2018: Biochemical and Biophysical Research Communications
https://www.readbyqxmd.com/read/29339162/a-method-to-improve-prediction-of-secondary-structure-for-large-single-rna-sequences
#10
Ali El-Lakkani, Eman M Ibrahim
The function of a particular RNA molecule within an organic system is principally determined by its structure. The current physical methods available for structure determination are time consuming and expensive. Hence, computational methods for structure prediction are often used. The prediction of the structure of a large single sequence of RNA needs a lot of research work. In the present work, a method is introduced to improve the prediction of large single sequence RNA secondary structure obtained by Mfold program using the concept of minimum free energy...
January 12, 2018: Biochemical and Biophysical Research Communications
https://www.readbyqxmd.com/read/29339161/a-new-genetically-engineered-mouse-model-of-choroid-plexus-carcinoma
#11
Salsabiel El Nagar, Frederique Zindy, Charlotte Moens, Luc Martin, Damien Plassard, Martine F Roussel, Thomas Lamonerie, Nathalie Billon
Choroid plexus carcinomas (CPCs) are highly malignant brain tumours predominantly found in children and associated to poor prognosis. Improved therapy for these cancers would benefit from the generation of animal models. Here we have created a novel mouse CPC model by expressing a stabilised form of c-Myc (MycT58A) and inactivating Trp53 in the choroid plexus of newborn mice. This induced aberrant proliferation of choroid plexus epithelial cells, leading to aggressive tumour development and death within 150 days...
January 12, 2018: Biochemical and Biophysical Research Communications
https://www.readbyqxmd.com/read/29339160/overstretching-partially-alkyne-functionalized-dsdna-using-near-infrared-optical-tweezers
#12
Allan Raudsepp, Lisa M Kent, Simon B Hall, Martin A K Williams
The force-extension behaviour of synthesized double-stranded DNAs (dsDNAs) designed to have 2.1% or 6.6% of the thyamine bases alkyne functionalized was studied using near infrared (NIR) optical tweezers. Measurements were carried out on substrates with and without flurophores covalently attached to the alkyne moiety over an extended force range (F=0-70 pN) and results were compared to those obtained from an unmodified control. In accordance with earlier work [1] (measured over a force range F=0-5 pN), the force-extension of the dsDNA containing 2...
January 12, 2018: Biochemical and Biophysical Research Communications
https://www.readbyqxmd.com/read/29339159/analysis-of-the-interactions-between-gmf-and-arp2-3-complex-in-two-binding-sites-by-molecular-dynamics-simulation
#13
A Popinako, M Antonov, D Dibrova, A Chemeris, O S Sokolova
The Arp2/3 complex plays a key role in nucleating actin filaments branching. The glia maturation factor (GMF) competes with activators for interacting with the Arp2/3 complex and initiates the debranching of actin filaments. In this study, we performed a comparative analysis of interactions between GMF and the Arp2/3 complex and identified new amino acid residues involved in GMF binding to the Arp2/3 complex at two separate sites, revealed by X-ray and single particle EM techniques. Using molecular dynamics simulations we demonstrated the quantitative and qualitative changes in hydrogen bonds upon binding with GMF...
January 12, 2018: Biochemical and Biophysical Research Communications
https://www.readbyqxmd.com/read/29339158/myosin-xi-localizes-at-the-mitotic-spindle-and-along-the-cell-plate-during-plant-cell-division-in-physcomitrella-patens
#14
Hao Sun, Fabienne Furt, Luis Vidali
Cell division is a fundamental biological process that has been extensively investigated in different systems. Similar to most eukaryotic cells, plant cells assemble a mitotic spindle to separate replicated chromosomes. In contrast, to complete cell division, plant cells assemble a phragmoplast, which is composed of aligned microtubules and actin filaments. This structure helps transport vesicles containing new cell wall material, which then fuse to form the cell plate; the cell plate will expand to create the new dividing cell wall...
January 12, 2018: Biochemical and Biophysical Research Communications
https://www.readbyqxmd.com/read/29339157/drastic-stability-change-of-x-x-mismatch-in-d-cxg-trinucleotide-repeat-disorders-under-molecular-crowding-condition
#15
Ye Teng, Smritimoy Pramanik, Hisae Tateishi-Karimata, Tatsuya Ohyama, Naoki Sugimoto
The trinucleotide repeat d(CXG) (X = A, C, G or T) is the most common sequence causing repeat expansion disorders. The formation of non-canonical structures, such as hairpin structures with X-X mismatches, has been proposed to affect gene expression and regulation, which are important in pathological studies of these devastating neurological diseases. However, little information is available regarding the thermodynamics of the repeat sequence under crowded cellular conditions where many non-canonical structures such as G-quadruplexes are highly stabilized, while duplexes are destabilised...
January 12, 2018: Biochemical and Biophysical Research Communications
https://www.readbyqxmd.com/read/29339156/structure-and-function-of-cytoplasmic-serine-hydroxymethyltransferase-from-pichia-pastoris
#16
Manfeng Zhang, Wei Wu, Zhongzhou Chen
Serine hydroxymethyltransferase (SHMT) catalyzes the interconversion of serine and glycine, which is crucial for one carbon metabolism. Here, we report the first crystal structure of cytoplasmic SHMT from Pichia pastoris (pcSHMT) diffracted to 2.5 Å resolution in space group C2221. PcSHMT was a contaminant with our target protein expressed in Pichia pastoris and confirmed by mass spectrometry. The overall structure of pcSHMT is similar to Human mitochondrial SHMT and different to E. coli SHMT. Interestingly, the oligomerization of pcSHMT expressed in eukaryotic or prokaryotic system differs significantly and is regulated by pyridoxal-5'-phosphate...
January 12, 2018: Biochemical and Biophysical Research Communications
https://www.readbyqxmd.com/read/29339155/truncated-cd200-stimulates-tumor-immunity-leading-to-fewer-lung-metastases-in-a-novel-wistar-rat-metastasis-model
#17
Jun Kuwabara, Akihiro Umakoshi, Naoki Abe, Yutaro Sumida, Shota Ohsumi, Eika Usa, Kana Taguchi, Mohammed E Choudhury, Hajime Yano, Shirabe Matsumoto, Takeharu Kunieda, Hisaaki Takahashi, Toshihiro Yorozuya, Yuji Watanabe, Junya Tanaka
CD200 mediates immunosuppression in immune cells that express its receptor, CD200R. There are two CD200 variants; truncated CD200 that lacks the N-terminal sequence necessary for CD200R binding (CD200S) and full-length CD200 (CD200L). We established a novel lung metastasis model by subcutaneously transplanting C6 glioma cells into the backs of neonatal Wistar rats. All transplanted rats developed large back tumors, nearly 90% of which bore lung metastases. To compare the effects of CD200S and CD200L on tumor immunity, CD200L (C6-L)- or CD200S (C6-S)-expressing C6 cells were similarly transplanted...
January 12, 2018: Biochemical and Biophysical Research Communications
https://www.readbyqxmd.com/read/29339154/a-new-hepatitis-b-virus-e-antigen-negative-strain-gene-used-as-a-reference-sequence-in-an-animal-model
#18
Min Cao, Zhonghua Zhao, Yuwei Tang, Qinglv Wei, Lei Wang, Qin Xiang, Yunmei Zhang, Huatang Zhang, Guoqi Lai
Infection with hepatitis B virus (HBV) e-antigen (HBeAg)-negative strains is increasingly prevalent. Currently, detailed information of the obtained natural HBV strain is not available except for the B genotype and HBeAg-negative. The aim of the present study was to characterize the natural genetic variation of the HBeAg-negative strain and investigate its function. The genic sequence was determined using Sanger sequencing, and compared to related sequences using alignment and phylogenetic analysis. In vivo, virus-specific serum markers were investigated in CBA/CaJ mice...
January 12, 2018: Biochemical and Biophysical Research Communications
https://www.readbyqxmd.com/read/29339153/inhibition-of-cox-2-and-5-lox-regulates-the-progression-of-colorectal-cancer-by-promoting-pten-and-suppressing-pi3k-akt-pathway
#19
Jian Chang, Nan Tang, Qi Fang, Kongfan Zhu, Lei Liu, Xingcheng Xiong, Zhongchao Zhu, Bixiang Zhang, Mingzhi Zhang, Jing Tao
For colorectal cancer (CRC) patients, local and systemic inflammatory responses have been extensively reported to closely associate with patient survival. However, the specific signalling pathways responsible for carcinogenic responses are unclear. Phosphatase and tensin homolog deleted on chromosome 10 (PTEN) is a negative regulator of PI3K/AKT pathway that is gradually inactivated in cancers through mutation, loss of heterozygosity and others epigenetic mechanisms. In addition, COX and LOX metabolic pathways of arachidonic acid (AA) play a crucial role in promoting adenoma development...
January 12, 2018: Biochemical and Biophysical Research Communications
https://www.readbyqxmd.com/read/29339152/biogenic-triamine-and-tetraamine-activate-core-catalytic-ability-of-tetrahymena-group-i-ribozyme-in-the-absence-of-its-large-activator-module
#20
Mst Ara Gulshan, Md Motiar Rahman, Shigeyoshi Matsumura, Tsunehiko Higuchi, Naoki Umezawa, Yoshiya Ikawa
Group I intron ribozymes share common core elements that form a three-dimensional structure responsible for their catalytic activity. This core structure is unstable without assistance from additional factors that stabilize its tertiary structure. We examined biogenic triamine and tetraamine and also their fragments for their abilities to stabilize a structurally unstable group I ribozyme, ΔP5 ribozyme, derived from the Tetrahymena group I intron ribozyme by deleting its large activator module. Biogenic triamine (spermidine) and tetraamine (spermine) efficiently activated the ΔP5 ribozyme under conditions where the ribozyme was virtually inactive...
January 12, 2018: Biochemical and Biophysical Research Communications
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