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https://www.readbyqxmd.com/read/27936433/carbon-starvation-induces-lipid-degradation-via-autophagy-in-the-model-alga-micrasterias
#1
Viola Schwarz, Ancuela Andosch, Anja Geretschläger, Matthias Affenzeller, Ursula Lütz-Meindl
Autophagy is regarded as crucial intracellular process in plant development but also in intracellular stress response. It is known to be controlled by the energy level of the cell and consequently can be triggered by energy deprivation. In this study carbon starvation evoked in different ways was investigated in the freshwater algae model system Micrasterias denticulata (Streptophyta) which is closely related to higher plants. Cells exposed to the photosynthesis inhibiting herbicide DCMU, to the glycolysis inhibitor 2-Deoxy-d-glucose and to complete darkness over up to 9 weeks for preventing metabolism downstream of glucose supply, were investigated by means of Nile red staining and analyses in CLSM, and TEM after cryo-preparation...
November 24, 2016: Journal of Plant Physiology
https://www.readbyqxmd.com/read/27936172/tamoxifen-isomers-and-metabolites-exhibit-distinct-affinity-and-activity-at-cannabinoid-receptors-potential-scaffold-for-drug-development
#2
Benjamin M Ford, Lirit N Franks, Anna Radominska-Pandya, Paul L Prather
Tamoxifen (Tam) is a selective estrogen receptor (ER) modulator (SERM) that is an essential drug to treat ER-positive breast cancer. Aside from known actions at ERs, recent studies have suggested that some SERMs like Tam also exhibit novel activity at cannabinoid subtype 1 and 2 receptors (CB1R and CB2Rs). Interestingly, cis- (E-Tam) and trans- (Z-Tam) isomers of Tam exhibit over a 100-fold difference in affinity for ERs. Therefore, the current study assessed individual isomers of Tam and subsequent cytochrome P450 metabolic products, 4-hydroxytamoxifen (4OHT) and 4-hydroxy-N-desmethyl tamoxifen (End) for affinity and activity at CBRs...
2016: PloS One
https://www.readbyqxmd.com/read/27936038/abuse-and-diversion-of-immediate-release-opioid-analgesics-as-compared-to-extended-release-formulations-in-the-united-states
#3
Janetta L Iwanicki, S Geoff Severtson, Heather McDaniel, Andrew Rosenblum, Chunki Fong, Theodore J Cicero, Matthew S Ellis, Steven P Kurtz, Mance E Buttram, Richard C Dart
BACKGROUND: Therapeutic use and abuse of prescription opioids in the United States increased substantially between 1990 and 2010. The Centers for Disease Control estimated deaths related to pharmaceutical opioids reached nearly 19,000 in 2014. Of prescription opioids sold, 10% are extended release (ER) and 90% immediate release (IR). However, most regulations and interventions have focused on decreasing ER abuse. Our objective was to compare rates of abuse and diversion of ER and IR opioid analgesics over time using multiple surveillance programs...
2016: PloS One
https://www.readbyqxmd.com/read/27935997/endoplasmic-reticulum-targeted-subunit-toxins-provide-a-new-approach-to-rescue-misfolded-mutant-proteins-and-revert-cell-models-of-genetic-diseases
#4
Humaira Adnan, Zhenbo Zhang, Hyun-Joo Park, Chetankumar Tailor, Clare Che, Mustafa Kamani, George Spitalny, Beth Binnington, Clifford Lingwood
Many germ line diseases stem from a relatively minor disturbance in mutant protein endoplasmic reticulum (ER) 3D assembly. Chaperones are recruited which, on failure to correct folding, sort the mutant for retrotranslocation and cytosolic proteasomal degradation (ER-associated degradation-ERAD), to initiate/exacerbate deficiency-disease symptoms. Several bacterial (and plant) subunit toxins, retrograde transport to the ER after initial cell surface receptor binding/internalization. The A subunit has evolved to mimic a misfolded protein and hijack the ERAD membrane translocon (dislocon), to effect cytosolic access and cytopathology...
2016: PloS One
https://www.readbyqxmd.com/read/27935862/targeting-of-interleukin-il-17a-inhibits-pdl1-expression-in-tumor-cells-and-induces-anticancer-immunity-in-an-estrogen-receptor-negative-murine-model-of-breast-cancer
#5
Yun-Feng Ma, Chen Chen, Dongqing Li, Min Liu, Zhuang-Wei Lv, Yanhong Ji, Jiru Xu
The expression of IL-17A and programmed death ligand 1 (PDL1) is increased in estrogen receptor-negative breast cancer. IL-17A promotes tumor cell survival and invasiveness and inhibits the antitumor immune response. The PDL1-PD1 (programmed death protein 1) signaling pathway promotes escape from immune surveillance in tumor cells. The pro-tumor properties of IL-17A and PDL1 in various cancers have been previously examined; however, the relationship and roles of IL-17A and PDL1 in ER-negative breast cancer have not been evaluated...
December 7, 2016: Oncotarget
https://www.readbyqxmd.com/read/27935826/retraction-the-generation-and-characterization-of-novel-col1a1frt-cre-er-t2-frt-and-col1a1frt-stop-frt-cre-er-t2-mice-for-sequential-mutagenesis
#6
Minsi Zhang, David G Kirsch
No abstract text is available yet for this article.
December 1, 2016: Disease Models & Mechanisms
https://www.readbyqxmd.com/read/27935820/s113r-mutation-in-slc33a1-leads-to-neurodegeneration-and-augmented-bmp-signaling-in-a-mouse-model
#7
Pingting Liu, Baichun Jiang, Jian Ma, Pengfei Lin, Yinshuai Zhang, Changshun Shao, Wenjie Sun, Yaoqin Gong
The S113R mutation (c.339T>G) (MIM #603690.0001) in SLC33A1 (MIM #603690), an ER membrane acetyl-CoA transporter, has been previously identified in patients with hereditary spastic paraplegia type 42 (SPG42; MIM #612539). SLC33A1 has also been shown to inhibit bone morphogenetic protein (BMP) signaling pathway in zebrafish. To better understand the function of SLC33A1, we generated and characterized Slc33a1(S113R) knock-in mice. Homozygous Slc33a1(S113R) mutant mice were embryonic lethal, while heterozygous Slc33a1 mutant mice (Slc33a1(wt/mut)) exhibited behavioral abnormalities and central neurodegeneration, which is consistent with HSP phenotypes...
November 24, 2016: Disease Models & Mechanisms
https://www.readbyqxmd.com/read/27935695/tunable-narrow-band-emissions-from-dye-sensitized-core-shell-shell-nanocrystals-in-the-second-near-infrared-biological-window
#8
Wei Shao, Guanying Chen, Andrey Kuzmin, Hilliard L Kutscher, Artem Pliss, Tymish Y Ohulchanskyy, Paras N Prasad
We introduce a hybrid organic-inorganic system consisting of epitaxial NaYF4:Yb(3+)/X(3+)@NaYbF4@NaYF4:Nd(3+) (X = null, Er, Ho, Tm, or Pr) core/shell/shell (CSS) nanocrystal with organic dye, indocyanine green (ICG) on the nanocrystal surface. This system is able to produce a set of narrow band emissions with a large Stokes-shift (>200 nm) in the second biological window of optical transparency (NIR-II, 1000-1700 nm), by directional energy transfer from light-harvesting surface ICG, via lanthanide ions in the shells, to the emitter X(3+) in the core...
December 9, 2016: Journal of the American Chemical Society
https://www.readbyqxmd.com/read/27935536/evaluation-of-a-12-month-pilot-of-long-term-and-temporary-assisted-peritoneal-dialysis
#9
Micheli U Bevilacqua, Linda Turnbull, Sushila Saunders, Lee Er, Helen Chiu, Penny Hill, Rajinder S Singh, Adeera Levin, Michael A Copland, Abeed Jamal, Catherine Brumby, Orla Dunne, Paul A Taylor
♦ Background: Peritoneal dialysis (PD) is challenging for patients with functional limitations, and assisted PD can support these patients, but previous reports of assisted PD have not examined the role of temporary assisted PD and had difficulty identifying adequate comparator cohorts. ♦ Methods: Peritoneal Dialysis Assist (PDA), a 12-month pilot of long-term and temporary assisted PD was completed in multiple PD centers in British Columbia, Canada. Continuous cycler PD (CCPD) patients were identified for PDA by standardized criteria, and service could be long-term or temporary/respite...
December 1, 2016: Peritoneal Dialysis International: Journal of the International Society for Peritoneal Dialysis
https://www.readbyqxmd.com/read/27935032/prognostic-analysis-of-patients-with-epilepsy-according-to-time-of-relapse-after-withdrawal-of-antiepileptic-drugs-following-four-seizure-free-years
#10
Soochul Park, Dong Hyun Lee, Seung Woo Kim, Yun Ho Roh
OBJECTIVE: We performed a retrospective, prognostic analysis of a cohort of patients with epilepsy according to time of relapse after four seizure-free years. METHODS: Planned withdrawal of antiepileptic drugs (AEDs) and at least 3 years of follow-up after AED discontinuation were performed. The following two groups were assessed: (1) an early relapse (ER) group of patients who experienced recurrence during AED withdrawal and (2) a late relapse (LR) group of patients who experienced recurrence after completion of the AED discontinuation process...
December 9, 2016: Epilepsia
https://www.readbyqxmd.com/read/27934418/synthesis-crystal-structures-magnetic-properties-and-theoretical-investigation-of-a-new-series-of-ni-ii-ln-iii-w-v-heterotrimetallics-understanding-the-smm-behavior-of-mixed-polynuclear-complexes
#11
Veacheslav Vieru, Traian D Pasatoiu, Liviu Ungur, Elizaveta Suturina, Augustin M Madalan, Carine Duhayon, Jean-Pascal Sutter, Marius Andruh, Liviu F Chibotaru
The polynuclear compounds containing anisotropic metal ions often exhibit efficient barriers for blocking of magnetization at fairly arbitrary geometries. However, at variance with mononuclear complexes, which usually become single-molecule magnets (SMM) under the sole requirement of a highly axial crystal field at the metal ion, the factors influencing the SMM behavior in polynuclear complexes, especially, with weakly axial magnetic ions, still remain largely unrevealed. As an attempt to clarify these conditions, we present here the synthesis, crystal structures, magnetic behavior, and ab initio calculations for a new series of Ni(II)-Ln(III)-W(V) trimetallics, [(CN)7W(CN)Ni(H2O)(valpn)Ln(H2O)4]·H2O (Ln = Y 1, Eu 2, Gd 3, Tb 4, Dy 5, Lu 6)...
December 5, 2016: Inorganic Chemistry
https://www.readbyqxmd.com/read/27933825/plasmon-enhanced-photodynamic-cancer-therapy-by-upconversion-nanoparticles-conjugated-with-au-nanorods
#12
Chieh-Wei Chen, Yung-Chieh Chan, Michael Hsiao, Ru-Shi Liu
Photodynamic therapy (PDT) based on photosensitizers (PSs) constructed with nanomaterials has been widely applied to treat cancer. This therapy is characterized by an improved PS accumulation in tumor regions. However, challenges, such as short penetration depth of light and low extinction coefficient of PSs, limit PDT applications. In this study, a nanocomposite consisting of NaYF4:Yb/Er upconversion nanoparticles (UCPs) conjugated with gold nanorods (Au NRs) was developed to improve the therapeutic efficiency of PDT...
November 30, 2016: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/27933735/danazol-has-potential-to-cause-pkc-translocation-cell-cycle-dysregulation-and-apoptosis-in-breast-cancer-cells
#13
Suman Jyoti Deka, Ashalata Roy, Vibin Ramakrishnan, Debasis Manna, Vishal Trivedi
Danazol, the established clinical drug has given promising therapeutic results in a series of clinical trials with breast cancer patients. Danazol shares structural similarities with several known PKC agonists and fits well into the C1 domain. Danazol binds to the C1b domain of PKC with Kd of 5.64±1.27 μM. MD simulation studies further support that the PKC-Danazol molecular model is stable and showing minimum distortion to the structure during the simulation period. Immunofluorescence and western-blotting studies indicate that MDAMB-231 cells stimulated with danazol exhibit translocation of PKCα to the plasma membrane...
December 9, 2016: Chemical Biology & Drug Design
https://www.readbyqxmd.com/read/27932618/the-roles-of-unfolded-protein-response-pathways-in-chlamydia-pathogenesis
#14
Zenas George, Yusuf Omosun, Anthony A Azenabor, James Partin, Kahaliah Joseph, Debra Ellerson, Qing He, Francis Eko, Claudiu Bandea, Pavel Svoboda, Jan Pohl, Carolyn M Black, Joseph U Igietseme
Chlamydia is an obligate intracellular bacterium that relies on host cell for essential nutrients and ATP for a productive infection. Although the unfolded protein response (UPR) plays a major role in certain microbial infectivity, its role in chlamydial pathogenesis is unknown. We hypothesized that Chlamydia induces UPR and exploits it to upregulate host cell uptake and metabolism of glucose, production of ATP, phospholipids and other molecules required for its replicative development and host survival. Using a combination of biochemical and pathway inhibition assays, we showed that the three UPR pathway transducers: Protein kinase RNA-activated (PKR)-like ER kinase (PERK), Inositol-requiring enzyme-1α (IRE1α), and Activating transcription factor-6α (ATF6α) were activated during Chlamydia infection...
December 8, 2016: Journal of Infectious Diseases
https://www.readbyqxmd.com/read/27932512/atf6-decreases-myocardial-ischemia-reperfusion-damage-and-links-er-stress-and-oxidative-stress-signaling-pathways-in-the-heart
#15
Jung-Kang Jin, Erik A Blackwood, Khalid M Azizi, Donna J Thuerauf, Asal G Fahem, Christoph Hofmann, Randal J Kaufman, Shirin Doroudgar, Christopher C Glembotski
RATIONALE: ER stress causes accumulation of misfolded proteins in the ER, activating the transcription factor, ATF6, which induces ER stress response genes. Myocardial ischemia induces the ER stress response; however, neither the function of this response nor whether it is mediated by ATF6 is known. OBJECTIVE: Here, we examined the effects of blocking the ATF6-mediated ER stress response on ischemia/reperfusion (I/R) in cardiac myocytes and mouse hearts. METHODS AND RESULTS: Knockdown of ATF6 in cardiac myocytes subjected to I/R increased ROS and necrotic cell death, which were mitigated by ATF6 overexpression...
December 8, 2016: Circulation Research
https://www.readbyqxmd.com/read/27932072/a-case-for-sec61-channel-involvement-in-erad
#16
REVIEW
Karin Römisch
Proteins that misfold in the endoplasmic reticulum (ER) need to be transported back to the cytosol for degradation by proteasomes, a process known as ER-associated degradation (ERAD). The first candidate discussed as a retrograde protein transport conduit was the Sec61 channel which is responsible for secretory protein transport into the ER during biogenesis. The Sec61 channel binds the proteasome 19S regulatory particle which can extract an ERAD substrate from the ER. Nevertheless its role as a general export channel has been dismissed, and Hrd1 and Der1 have been proposed as alternatives...
December 5, 2016: Trends in Biochemical Sciences
https://www.readbyqxmd.com/read/27931634/complications-of-endoscopic-polypectomy-endoscopic-mucosal-resection-and-endoscopic-submucosal-dissection-in-the-colon
#17
REVIEW
Michael X Ma, Michael J Bourke
Endoscopic resection (ER), including endoscopic polypectomy (EP), endoscopic mucosal resection (EMR) and endoscopic submucosal dissection (ESD) are used to remove superficial neoplasms from the colon. Snare resection is used for EP and EMR, whereas endoscopic knives are used to perform dissection in the submucosal space in ESD. 80-90% colonic polyps are <10 millimetres (mm) and are effectively managed by conventional EP. Increasingly cold snare polypectomy is preferred. Large laterally spreading lesions (LSLs) and sessile polyps ≥20 mm are primarily removed by EMR...
October 2016: Best Practice & Research. Clinical Gastroenterology
https://www.readbyqxmd.com/read/27931238/elaboration-of-a-nomogram-to-predict-nonsentinel-node-status-in-breast-cancer-patients-with-positive-sentinel-node-intraoperatively-assessed-with-one-step-nucleic-amplification-retrospective-and-validation-phase
#18
Franco Di Filippo, Simona Di Filippo, Anna Maria Ferrari, Raffaele Antonetti, Alessandro Battaglia, Francesca Becherini, Laia Bernet, Renzo Boldorini, Catherine Bouteille, Simonetta Buglioni, Paolo Burelli, Rafael Cano, Vincenzo Canzonieri, Pierluigi Chiodera, Alfredo Cirilli, Luigi Coppola, Stefano Drago, Luca Di Tommaso, Privato Fenaroli, Roberto Franchini, Andrea Gianatti, Diana Giannarelli, Carmela Giardina, Florence Godey, Massimo M Grassi, Giuseppe B Grassi, Siobhan Laws, Samuele Massarut, Giuseppe Naccarato, Maria Iole Natalicchio, Sergio Orefice, Fabrizio Palmieri, Tiziana Perin, Manuela Roncella, Massimo G Roncalli, Antonio Rulli, Angelo Sidoni, Corrado Tinterri, Maria C Truglia, Isabella Sperduti
BACKGROUND: Tumor-positive sentinel lymph node (SLN) biopsy results in a risk of non sentinel node metastases in micro- and macro-metastases ranging from 20 to 50%, respectively. Therefore, most patients underwent unnecessary axillary lymph node dissections. We have previously developed a mathematical model for predicting patient-specific risk of non sentinel node (NSN) metastases based on 2460 patients. The study reports the results of the validation phase where a total of 1945 patients were enrolled, aimed at identifying a tool that gives the possibility to the surgeon to choose intraoperatively whether to perform or not axillary lymph node dissection (ALND)...
December 8, 2016: Journal of Experimental & Clinical Cancer Research: CR
https://www.readbyqxmd.com/read/27931122/modulation-of-pancreatic-islets-function-and-survival-during-aging-involves-the-differential-regulation-of-endoplasmic-reticulum-stress-by-p21-and-chop
#19
Chrysovalantou Mihailidou, Ioulia Chatzistamou, Athanasios Papavassiliou, Hippokratis Kiaris
AIMS: While endoplasmic reticulum (ER) stress is recognized as a major mechanism causing pancreatic dysfunction in diabetes, little is known on how aging modulates the process. Here we compared the response to ER stress, viability and insulin release from pancreatic islets of young (6 weeks) or aged (14 months) mice. RESULTS: Islets from aged mice were more sensitive to ER stress than their younger counterparts, they exhibited more pronounced unfolded protein response (UPR) and caspase activation and displayed compromised insulin release after high glucose stimulation...
December 8, 2016: Antioxidants & Redox Signaling
https://www.readbyqxmd.com/read/27930712/cantharidin-induced-oral-squamous-cell-carcinoma-cell-apoptosis-via-the-jnk-regulated-mitochondria-and-endoplasmic-reticulum-stress-related-signaling-pathways
#20
Chin-Chuan Su, Kuan-I Lee, Mu-Kuan Chen, Chun-Ying Kuo, Chih-Hsin Tang, Shing Hwa Liu
Oral cancer is a subtype of head and neck cancer which represents 2.65% of all human malignancies. Most of oral cancer is histopathologically diagnosed as oral squamous cell carcinoma (OSCC). OSCC is characterized by a high degree of local invasion and a high rate of metastasis to the cervical lymph nodes. How to prevention and treatment of OSCC is important and imperative. Here, we investigated the therapeutic effect and molecular mechanism of cantharidin, an active compound isolated from blister beetles, on OSCC in vitro...
2016: PloS One
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