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https://www.readbyqxmd.com/read/28196083/cacybp-sip-promotes-the-proliferation-of-colon-cancer-cells
#1
Huihong Zhai, Yongquan Shi, Xiong Chen, Jun Wang, Yuanyuan Lu, Faming Zhang, Zhengxiong Liu, Ting Lei, Daiming Fan
CacyBP/SIP is a component of the ubiquitin pathway and is overexpressed in several transformed tumor tissues, including colon cancer, which is one of the most common cancers worldwide. It is unknown whether CacyBP/SIP promotes the proliferation of colon cancer cells. This study examined the expression level, subcellular localization, and binding activity of CacyBP/SIP in human colon cancer cells in the presence and absence of the hormone gastrin. We found that CacyBP/SIP was expressed in a high percentage of colon cancer cells, but not in normal colonic surface epithelium...
2017: PloS One
https://www.readbyqxmd.com/read/28186089/adenovirus-mediated-tipe2-overexpression-inhibits-gastric-cancer-metastasis-via-reversal-of-epithelial-mesenchymal-transition
#2
H Yin, X Huang, M Tao, Q Hu, J Qiu, W Chen, J Wu, Y Xie
Tumor necrosis factor (TNF)-alpha-induced protein 8-like 2 (TNFAIP8L2; also termed TIPE2) has been shown to be involved in both the immune-negative modulation and cancer. We previously found that TIPE2 is lost in human gastric cancer, and TIPE2 restoration suppresses gastric cancer growth by induction of apoptosis and impairment of protein kinase B (PKB/AKT) and extracellular signal-regulated kinase-1/2 (ERK1/2) signaling. However, its correlation with epithelial-mesenchymal transition (EMT) in gastric cancer is largely elusive...
February 10, 2017: Cancer Gene Therapy
https://www.readbyqxmd.com/read/28182699/bifunctional-effects-of-o-methylated-flavones-from-scutellaria-baicalensis-georgi-on-melanocytes-inhibition-of-melanin-production-and-intracellular-melanosome-transport
#3
Michiko Kudo, Kumiko Kobayashi-Nakamura, Kentaro Tsuji-Naito
The growing interest in skin lightening has recently renewed attention on the esthetic applications of Chinese herbal medicine. Although Scutellaria baicalensis Georgi is used for antipyretic and antiinflammatory purposes, its whitening effect remains unclear. This study reports three major findings: (1) S. baicalensis has a potent inhibitory effect on melanogenesis; (2) wogonin and its glycoside are the active components of S. baicalensis; and (3) O-methylated flavones from S. baicalensis, such as wogonin, inhibit intracellular melanosome transport...
2017: PloS One
https://www.readbyqxmd.com/read/28152014/apigenin-selective-ck2-inhibitor-increases-ikaros-expression-and-improves-t-cell-homeostasis-and-function-in-murine-pancreatic-cancer
#4
Nadine Nelson, Karoly Szekeres, Cristina Iclozan, Ivannie Ortiz Rivera, Andrew McGill, Gbemisola Johnson, Onyekachi Nwogu, Tomar Ghansah
Pancreatic cancer (PC) evades immune destruction by favoring the development of regulatory T cells (Tregs) that inhibit effector T cells. The transcription factor Ikaros is critical for lymphocyte development, especially T cells. We have previously shown that downregulation of Ikaros occurs as a result of its protein degradation by the ubiquitin-proteasome system in our Panc02 tumor-bearing (TB) mouse model. Mechanistically, we observed a deregulation in the balance between Casein Kinase II (CK2) and protein phosphatase 1 (PP1), which suggested that increased CK2 activity is responsible for regulating Ikaros' stability in our model...
2017: PloS One
https://www.readbyqxmd.com/read/28142215/proteasomal-ido-degradation-reduces-the-immunosuppressive-potential-of-clinical-grade-mesenchymal-stromal-cells-undergoing-replicative-senescence
#5
Séverine Loisel, Joëlle Dulong, Cédric Ménard, Marie-Laure Renoud, Nadine Meziere, Bezier Isabelle, Maëlle Latour, Nadège Bescher, Rémy Pedeux, Nicolas Bertheuil, Erwan Flecher, Luc Sensebé, Karin Tarte
Owing to their immunosuppressive properties, mesenchymal stromal cells (MSCs) obtained from bone marrow (BM-MSCs) or adipose tissue (ASCs) are considered a promising tool for cell therapy. However, important issues should be considered to ensure the reproducible production of efficient and safe clinical-grade MSCs. In particular, high expansion rate, associated with progressive senescence, was recently proposed as one of the parameters that could alter MSC functionality. In this study, we directly address the consequences of replicative senescence on BM-MSC and ASC immunomodulatory properties...
January 31, 2017: Stem Cells
https://www.readbyqxmd.com/read/28122580/identification-of-small-molecule-modulators-of-hiv-1-tat-and-rev-protein-accumulation
#6
Ahalya Balachandran, Raymond Wong, Peter Stoilov, Sandy Pan, Benjamin Blencowe, Peter Cheung, P Richard Harrigan, Alan Cochrane
BACKGROUND: HIV-1 replication is critically dependent upon controlled processing of its RNA and the activities provided by its encoded regulatory factors Tat and Rev. A screen of small molecule modulators of RNA processing identified several which inhibited virus gene expression, affecting both relative abundance of specific HIV-1 RNAs and the levels of Tat and Rev proteins. RESULTS: The screen for small molecules modulators of HIV-1 gene expression at the post-transcriptional level identified three (a pyrimidin-7-amine, biphenylcarboxamide, and benzohydrazide, designated 791, 833, and 892, respectively) that not only reduce expression of HIV-1 Gag and Env and alter the accumulation of viral RNAs, but also dramatically decrease Tat and Rev levels...
January 26, 2017: Retrovirology
https://www.readbyqxmd.com/read/28117552/oscesa9-conserved-site-mutation-leads-to-largely-enhanced-plant-lodging-resistance-and-biomass-enzymatic-saccharification-by-reducing-cellulose-dp-and-crystallinity-in-rice
#7
Fengcheng Li, Guosheng Xie, Jiangfeng Huang, Ran Zhang, Yu Li, Miaomiao Zhang, Yanting Wang, Ao Li, Xukai Li, Tao Xia, Chengcheng Qu, Fan Hu, Arthur J Ragauskas, Liangcai Peng
Genetic modification of plant cell walls has been posed to reduce lignocellulose recalcitrance for enhancing biomass saccharification. Since cellulose synthase (CESA) gene is first identified, several dozen CESA mutants have been reported, but almost all mutants exhibit the defective phenotypes in plant growth and development. In this study, the rice (Oryza sativa) Osfc16 mutant with substitutions (W481C, P482S) at P-CR conserved-site in CESA9 shows a slightly affected plant growth and higher biomass yield by 25%-41% compared with wild type (Nipponbare, a japonica variety)...
January 24, 2017: Plant Biotechnology Journal
https://www.readbyqxmd.com/read/28115710/differential-control-of-retrovirus-silencing-in-embryonic-cells-by-proteasomal-regulation-of-the-zfp809-retroviral-repressor
#8
Cheng Wang, Stephen P Goff
Replication of the murine leukemia viruses is strongly suppressed in mouse embryonic stem (ES) cells. Proviral DNAs are formed normally but are then silenced by a large complex bound to DNA by the ES cell-specific zinc-finger protein ZFP809. We show here that ZFP809 expression is not regulated by transcription but rather by protein turnover: ZFP809 protein is stable in embryonic cells but highly unstable in differentiated cells. The protein is heavily modified by the accumulation of polyubiquitin chains in differentiated cells and stabilized by the proteasome inhibitor MG132...
February 7, 2017: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/28114332/a-novel-single-nucleotide-t980c-polymorphism-in-the-human-carboxypeptidase-e-gene-results-in-loss-of-neuroprotective-function
#9
Lin Cong, Yong Cheng, Niamh X Cawley, Saravana R K Murthy, Y Peng Loh
Report of a human with a homozygous truncating null mutation of the Carboxypeptidase E (CPE) gene with endocrinological and neurological deficits prompted us to search for other mutations in the human CPE gene that might be linked to disease. We searched an EST database and identified from a small population of patients, a novel T to C single nucleotide polymorphism (SNP) in the CPE gene at bp980 of exon 4, herein called TC-CPE. This introduces a tryptophan to arginine (W235R) mutation in the catalytic domain of human CPE protein...
2017: PloS One
https://www.readbyqxmd.com/read/28106491/effect-of-an-mg132-sustained-drug-delivery-capsular-ring-on-the-inhibition-of-posterior-capsule-opacification-in-a-rabbit-model
#10
Xuan Bao, Min Hou, Yingyan Qin, Furong Luo, Fu Shang, Mingxing Wu
PURPOSE: To design an MG132-sustained drug delivery capsular ring (SDDCR) and investigate its effect on the inhibition of posterior capsule opacification (PCO) in a rabbit model. METHODS: The SDDCRs were prepared by forming a slice of film made by the mixture of poly lactic-co-glycolic acid (PLGA) and MG132 on the surface of capsular tension rings (CTRs). The drug-loading capacity, entrapment efficiency, and in vitro release of the drug-containing film were detected...
January 20, 2017: Journal of Ocular Pharmacology and Therapeutics
https://www.readbyqxmd.com/read/28100501/mdm2-mediates-fibroblast-activation-and-renal-tubulointerstitial-fibrosis-via-p53-independent-pathway
#11
Chen Ye, Hui Tang, Zheng Zhao, Chun-Tao Lei, Chao-Qun You, Jiao Zhang, Pan Gao, Fang-Fang He, Shan Chen, Yumei Wang, Chun Zhang, Hua Su
It is well-recognized that Murine Double Minute gene 2 (MDM2) plays a critical role in cell proliferation and inflammatory processes during tumorigenesis. Also it is reported that MDM2 is expressed in glomeruli and involved in podocyte injury. However, whether MDM2 is implicated in renal fibrosis remains unclear. Here we investigated the role of MDM2 in tubulointerstitial fibrosis (TIF). By immunohistochemical staining and western blotting we confirmed that MDM2 is up-regulated in tubulointerstitial compartment in TIF patients and Unilateral Urethral Obstruction (UUO) mice, which mainly originates from myofibroblasts...
January 18, 2017: American Journal of Physiology. Renal Physiology
https://www.readbyqxmd.com/read/28098164/uncovering-the-sumoylation-and-ubiquitylation-crosstalk-in-human-cells-using-sequential-peptide-immunopurification
#12
Frédéric Lamoliatte, Francis P McManus, Ghizlane Maarifi, Mounira K Chelbi-Alix, Pierre Thibault
Crosstalk between the SUMO and ubiquitin pathways has recently been reported. However, no approach currently exists to determine the interrelationship between these modifications. Here, we report an optimized immunoaffinity method that permits the study of both protein ubiquitylation and SUMOylation from a single sample. This method enables the unprecedented identification of 10,388 SUMO sites in HEK293 cells. The sequential use of SUMO and ubiquitin remnant immunoaffinity purification facilitates the dynamic profiling of SUMOylated and ubiquitylated proteins in HEK293 cells treated with the proteasome inhibitor MG132...
January 18, 2017: Nature Communications
https://www.readbyqxmd.com/read/28088021/sanguinarine-induced-oxidative-stress-and-apoptosis-like-programmed-cell-death-al-pcd-in-root-meristem-cells-of-allium-cepa
#13
Aneta Żabka, Konrad Winnicki, Justyna Teresa Polit, Janusz Maszewski
A vast number of studies on plant cell systems clearly indicate that various biotic and abiotic stresses give rise to the uncontrolled increase in the level of reactive oxygen species (ROS). Excess concentrations of ROS result in damage to proteins, lipids, carbohydrates, and DNA, which may lead, in consequence, to the apoptotic cell death. The current study investigates the effects of sanguinarine (SAN), a natural alkaloid derived from the roots of Sanguinaria canadensis, on root apical meristem cells of Allium cepa...
January 4, 2017: Plant Physiology and Biochemistry: PPB
https://www.readbyqxmd.com/read/28087276/drosophila-argonaute2-turnover-is-regulated-by-the-ubiquitin-proteasome-pathway
#14
Madoka Chinen, Elissa P Lei
Argonaute (AGO) proteins play a central role in the RNA interference (RNAi) pathway, which is a cytoplasmic mechanism important for post-transcriptional regulation of gene expression. In Drosophila, AGO2 also functions in the nucleus to regulate chromatin insulator activity and transcription. Although there are a number of studies focused on AGO2 function, the regulation of AGO2 turnover is not well understood. We found that mutation of T1149 or R1158 in the conserved PIWI domain causes AGO2 protein instability, but only T1149 affects RNAi activity...
February 12, 2017: Biochemical and Biophysical Research Communications
https://www.readbyqxmd.com/read/28086832/norcantharidin-inhibits-cell-growth-by-suppressing-the-expression-and-phosphorylation-of-both-egfr-and-c-met-in-human-colon-cancer-cells
#15
Peiju Qiu, Siwen Wang, Ming Liu, He Ma, Xuan Zeng, Meng Zhang, Lingling Xu, Yidi Cui, Huixin Xu, Yang Tang, Yanli He, Lijuan Zhang
BACKGROUND: Norcantharidin (NCTD) is a Chinese FDA approved, chemically synthesized drug for cancer treatment. The effect of NCTD on signaling proteins of EGFR and c-Met was systematically elucidated in current study. METHODS: Two human colon cancer cell lines, HCT116 and HT29, were used as model systems to investigate the anti-cancer molecular mechanism of NCTD. Cell cycle arrest and early/late apoptosis were analyzed by flow cytometry. The levels of EGFR, phospho-EGFR, c-Met, phospho-c-Met and other related proteins were quantified by western blot analysis...
January 13, 2017: BMC Cancer
https://www.readbyqxmd.com/read/28073696/spop-promotes-sirt2-degradation-and-suppresses-non-small-cell-lung-cancer-cell-growth
#16
Jie Luo, Yu-Chen Bao, Xian-Xiu Ji, Bin Chen, Qin-Fang Deng, Song-Wen Zhou
SIRT2 is a NAD-dependent deacetylase and inhibition of SIRT2 has a broad anticancer activity. Here we report that SPOP binds to SIRT2 and mediates its degradation by the 26S proteasome, which can be blocked by MG132 treatment. We also found that the levels of SPOP significantly decreased, while the levels of SIRT2 significantly increased in non-small cell lung cancer (NSCLC) cell lines, compared to normal bronchial epithelial cell line and NSCLC specimens, compared to the paired non-tumor lung tissue. Furthermore, SPOP can suppress NSCLC cell growth...
January 7, 2017: Biochemical and Biophysical Research Communications
https://www.readbyqxmd.com/read/28052875/liver-x-receptor-%C3%AE-lxr%C3%AE-increases-aqp2-protein-level-via-a-post-transcriptional-mechanism-in-renal-collecting-ducts
#17
Wen Su, Shi-Zheng Huang, Min Gao, Xiao-Mu Kong, Jan-Ake Gustafsson, Su-Juan Xu, Bing Wang, Feng Zheng, Li-Hong Chen, Nan-Ping Wang, You-Fei Guan, Xiao-Yan Zhang
Liver X Receptors (LXRs) including LXRα and LXRβ are nuclear receptor transcription factors and play an important role in lipid and glucose metabolism. It has been previously reported that mice lacking LXRβ but not LXRα develop a severe urine concentrating defect, likely via a central mechanism. Here we provide evidence that LXRβ regulates water homeostasis through increasing aquaporin 2 (AQP2) protein levels in renal collecting ducts. LXRβ-/- mice exhibited a reduced response to dDAVP stimulation, suggesting that the diabetes insipidus phenotype is of both central and nephrogenic origin...
January 4, 2017: American Journal of Physiology. Renal Physiology
https://www.readbyqxmd.com/read/28035387/therapeutic-mechanisms-of-ibuprofen-prednisone-and-betamethasone-in-osteoarthritis
#18
Fenglong Sun, Yaohua Zhang, Qiang Li
The present study aimed to investigate the therapeutic mechanisms of nonsteroidal anti-inflammatory drugs (NSAIDs) and steroids in osteoarthritis (OA). The CHON‑002 human chondrocyte cell line was used in the study. The levels of the cytokines, interleukin (IL)‑1β, IL‑6, IL‑8 and IL‑10, released by cells treated with tumor necrosis factor‑α (TNF‑α) were determined by ELISA. Levels of collagen I, aggrecan, matrix metalloproteinase (MMP)‑1, MMP‑13, signal transducer and activator of transcription (STAT) 3, nuclear factor‑κB (NF‑κB) subunit p65 and inhibitory subunit of NF‑κB (IκB) following treatment with IL‑1β, IL‑6, IL‑8 or IL‑10 were assessed by western blot...
February 2017: Molecular Medicine Reports
https://www.readbyqxmd.com/read/28009721/propofol-provides-cardiac-protection-by-suppressing-the-proteasome-degradation-of-caveolin-3-in-ischemic-reperfused-rat-hearts
#19
Afang Zhu, Xin Wei, Yali Zhang, Tao You, Shanglong Yao, Shiying Yuan, Haodong Xu, Faqian Li, Weike Mao
The mechanisms underlying propofol's cardioprotective role remain elusive. Caveolin-3 (Cav-3) has been shown to mediate both opioids- and volatile anesthetics-induced cardioprotection against ischemia/reperfusion (I/R) injury. We hypothesize that the cardioprotective role of propofol is mediated through Cav-3 and its regulation of PI3K/Akt/GSK3β signal pathway. Rats or H9c2 cardiomyocytes were exposed to propofol prior to I/R or simulated ischemia/reperfusion (SI/R). Propofol pretreatment significantly decreased left ventricle (LV) infarct size in vivo (P < 0...
December 17, 2016: Journal of Cardiovascular Pharmacology
https://www.readbyqxmd.com/read/28000177/geniposide-accelerates-proteasome-degradation-of-txnip-to-inhibit-insulin-secretion-in-pancreatic-%C3%AE-cells
#20
C Y Liu, Y N Hao, F Yin, Y L Zhang, J H Liu
PURPOSE: To analyze the role of geniposide in the protein degradation of Txnip and to determine the impact of Txnip on geniposide-regulated GSIS in pancreatic INS-1 cells. METHODS: The content of Txnip protein was measured by western blot; insulin content and glucose uptake were determined by ELISA; and knockdown of Txnip was the method of RNA interference. RESULTS: Glucose induces a rapid increase in Txnip protein, and geniposide accelerates the degradation of Txnip via proteasome pathway in the presence of high glucose (25 mM) in INS-1 pancreatic β-cells...
December 20, 2016: Journal of Endocrinological Investigation
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