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https://www.readbyqxmd.com/read/28713944/truncated-apolipoprotein-c-i-induces-apoptosis-in-neuroblastoma-by-activating-caspases-in-the-extrinsic-and-intrinsic-pathways
#1
Fei Guo, Wei Zhao, Lin Yang, Yang Yang, Saiqi Wang, Yingjun Wang, Zhaoming Li, Jiaxiang Wang
Truncated apolipoprotein C-I is a post-translationally modified protein characterized by the loss of threonine and proline residues from the N-terminus of the mature peptide. The truncated peptide is involved in many physiological and pathological processes in vivo and is related to malignant diseases. The aim of the present study was to assess the effects of the truncated peptide on tumorigenesis in neuroblastoma. The truncated peptide was chemically synthesized, and a signal peptide was used as the negative control...
July 14, 2017: Oncology Reports
https://www.readbyqxmd.com/read/28708784/apoptotic-diminution-of-immature-single-and-double-positive-thymocyte-subpopulations-contributes-to-thymus-involution-during-murine-polymicrobial-sepsis
#2
Christoph Netzer, Tilo Knape, Laura Kuchler, Andreas Weigert, Kai Zacharowski, Waltraud Pfeilschifter, Gregory Sempowski, Michael J Parnham, Bernhard Brüne, Andreas von Knethen
To generate and maintain functional T-cell receptor diversity, thymocyte development is tightly organized. Errors in this process may have dramatic consequences, provoking, for example, autoimmune diseases. Probably for this reason, the thymus reacts to septic stress with involution, decreasing the numbers of thymocytes. Because it is still unclear which thymocyte subpopulation contributes to thymus involution and whether thymocyte emigration is altered, we were interested to clarify this question in detail...
August 2017: Shock
https://www.readbyqxmd.com/read/28698383/pancreatic-%C3%AE-cell-protection-from-inflammatory-stress-by-the-endoplasmic-reticulum-proteins-thrombospondin-1-and-mesencephalic-astrocyte-derived-neutrotrophic-factor-manf
#3
Daniel A Cunha, Monia Cito, Fabio A Grieco, Cristina Cosentino, Tatiana Danilova, Laurence Ladriere, Maria Lindahl, Andrii Domanskyi, Marco Bugliani, Piero Marchetti, Decio L Eizirik, Miriam Cnop
Cytokine-induced endoplasmic reticulum (ER) stress is one of the molecular mechanisms underlying pancreatic β-cell demise in type 1 diabetes. Thrombospondin-1 (THBS1) was recently shown to promote β-cell survival during lipotoxic stress. Here we show that ER-localized THBS1 is cytoprotective to rat, mouse and human β-cells exposed to cytokines or thapsigargin-induced ER stress. THBS1 confers cytoprotection by maintaining expression of mesencephalic astrocyte-derived neutrotrophic factor (MANF) in β-cells, and thereby prevents the BH3-only protein BIM-dependent triggering of the mitochondrial pathway of apoptosis...
July 11, 2017: Journal of Biological Chemistry
https://www.readbyqxmd.com/read/28693620/development-of-an-in-silico-method-for-the-identification-of-subcomplexes-involved-in-the-biogenesis-of-multiprotein-complexes-in-saccharomyces-cerevisiae
#4
Annie Glatigny, Philippe Gambette, Alexa Bourand-Plantefol, Geneviève Dujardin, Marie-Hélène Mucchielli-Giorgi
BACKGROUND: Large sets of protein-protein interaction data coming either from biological experiments or predictive methods are available and can be combined to construct networks from which information about various cell processes can be extracted. We have developed an in silico approach based on these information to model the biogenesis of multiprotein complexes in the yeast Saccharomyces cerevisiae. RESULTS: Firstly, we have built three protein interaction networks by collecting the protein-protein interactions, which involved the subunits of three complexes, from different databases...
July 11, 2017: BMC Systems Biology
https://www.readbyqxmd.com/read/28693160/isoliquiritigenin-induces-apoptosis-of-human-bladder-cancer-t24-cells-via-a-cyclin-dependent-kinase-independent-mechanism
#5
Lingling Si, Xinhui Yang, Xinyan Yan, Yanming Wang, Qiusheng Zheng
The aim of the present study was to investigate whether an increase in cyclin-dependent kinase 2 (CDK2) activity is involved in apoptosis of human bladder cancer T24 cells induced by isoliquiritigenin (ISL). The viability of T24 cells was estimated using a sulforhodamine B assay. Cell morphological changes were examined using Hoechst 33258 staining. The apoptotic rate was determined by staining cells with Annexin V-fluorescein isothiocyanate and propidium iodide labeling. The mitochondrial membrane potential (ΔΨm) was measured using 5,5,6,6-tetrachloro-1,1, 3,3-tetraethyl benzimidazole carbocyanine iodide...
July 2017: Oncology Letters
https://www.readbyqxmd.com/read/28691217/double-arm-lanthanide-tags-deliver-narrow-gd3-gd3-distance-distributions-in-deer-measurements
#6
Adarshi Welegedara, Yin Yang, Michael Lee, James Swarbrick, Thomas Huber, Bim Graham, Daniella Goldfarb, Gottfried Otting
Double-arm cyclen-based Gd3+ tags are shown to produce accurate nanometer scale Gd3+-Gd3+ distance measurements in double electron-electron resonance (DEER) experiments by confining the space accessible to the metal ion. The results show excellent agreement with predictions both for the maximum and width of the measured distance distributions. For distance measurements in proteins, the tags can be attached to two cysteine residues located in positions i and i+4, or i and i+8, of an α-helix. In the latter case, an additional mutation introducing an aspartic acid at position i+4 achieves particularly narrow distribution widths...
July 9, 2017: Chemistry: a European Journal
https://www.readbyqxmd.com/read/28682604/extending-the-excitation-wavelength-of-potential-photosensitizers-via-appendage-of-a-kinetically-stable-terbium-iii-macrocyclic-complex-for-applications-in-photodynamic-therapy
#7
Phuc Ung, Michèle Clerc, Huaiyi Huang, Kangqiang Qiu, Hui Chao, Michael Seitz, Ben Boyd, Bim Graham, Gilles Gasser
The development of viable photodynamic therapy protocols is often hindered by photosensitizers that require high-energy UV irradiation that has limited potential for clinical use due to its low tissue penetration. Herein, we report a strategy for extending the excitation wavelength of potential photosensitizers via the covalent attachment of a terbium(III)-1,4,7,10-tetraazacyclododecane-1,4,7-triacetate complex (DO3A-Tb). The method was systematically demonstrated with a series of polycyclic aromatic hydrocarbons (naphthalene, phenanthrene, anthracene, pyrene, and fluoranthene) to prepare six new complexes (Tb1-Tb6) with bathochromic shifts that extended into the visible region...
July 17, 2017: Inorganic Chemistry
https://www.readbyqxmd.com/read/28682602/synchronized-collective-proton-assisted-electron-transfer-in-solid-state-by-hydrogen-bonding-ru-ii-ru-iii-mixed-valence-molecular-crystals
#8
Makoto Tadokoro, Hiroyuki Hosoda, Tomonori Inoue, Akira Murayama, Koichiro Noguchi, Atsushi Iioka, Ryota Nishimura, Masaki Itoh, Tomoaki Sugaya, Hajime Kamebuchi, Masa-Aki Haga
A proton-coupled electron transfer (PCET) reaction was widely studied with isolated organic molecules and metal complexes in solution in view of the biological catalytic reaction, while studying this reaction in the crystalline or solid-state phase, which has a novel example, would give insight into the rather internal environment of proteins without solvation and a creation of new molecular materials. We tried to crystallize a hydrogen-bonded (H-bonded) coordination polymer with one-dimensional nanoporous channels, formed from redox-active Ru(III) complexes, [Ru(III)(Hbim)3] (Hbim(-) = 2,2'-biimidazolate monoanion)...
July 17, 2017: Inorganic Chemistry
https://www.readbyqxmd.com/read/28682312/the-bh3-only-proteins-bim-and-puma-are-not-critical-for-the-reticulocyte-apoptosis-caused-by-loss-of-the-pro-survival-protein-bcl-xl
#9
Alex Rd Delbridge, Brandon J Aubrey, Craig Hyland, Jonathan P Bernardini, Ladina Di Rago, Jean-Marc Garnier, Guillaume Lessene, Andreas Strasser, Warren S Alexander, Stephanie Grabow
Anaemia is a major global health problem arising from diverse causes and for which improved therapeutic strategies are needed. Erythroid cells can undergo apoptotic cell death and loss of pro-survival BCL-XL is known to trigger apoptosis during late-stage erythroid development. However, the mechanism by which loss or pharmacological blockade of BCL-XL leads to erythroid cell apoptosis remains unclear. Here we sought to identify the precise stage of erythropoiesis that depends on BCL-XL. We also tested whether deficiency of BIM or PUMA, the two main pro-apoptotic antagonists of BCL-XL, could prevent reticulocyte death and anaemia caused by BCL-XL loss...
July 6, 2017: Cell Death & Disease
https://www.readbyqxmd.com/read/28680816/redox-modulation-of-thimet-oligopeptidase-activity-by-hydrogen-peroxide
#10
Marcelo Y Icimoto, Juliana C Ferreira, César H Yokomizo, Larissa V Bim, Alyne Marem, Joyce M Gilio, Vitor Oliveira, Iseli L Nantes
Thimet oligopeptidase (EC 3.4.24.15, TOP) is a cytosolic mammalian zinc protease that can process a diversity of bioactive peptides. TOP has been pointed out as one of the main postproteasomal enzymes that process peptide antigens in the MHC class I presentation route. In the present study, we describe a fine regulation of TOP activity by hydrogen peroxide (H2O2). Cells from a human embryonic kidney cell line (HEK293) underwent an ischemia/reoxygenation-like condition known to increase H2O2 production. Immediately after reoxygenation, HEK293 cells exhibited a 32% increase in TOP activity, but no TOP activity was observed 2 h after reoxygenation...
July 2017: FEBS Open Bio
https://www.readbyqxmd.com/read/28670489/heat-shock-protein-70-2-hsp70-2-a-novel-cancer-testis-antigen-that-promotes-growth-of-ovarian-cancer
#11
Namita Gupta, Nirmala Jagadish, Avadhesha Surolia, Anil Suri
Heat shock protein 70-2 (HSP70-2) is known to be involved in tumor progression. However, its molecular role and mechanism in epithelial ovarian cancer (EOC) remains unknown. In the present investigation, we examined the role of HSP70-2 in cell cycle, apoptosis and epithelial mesenchymal transition pathways in EOC cells in in vitro and in-vivo xenograft mouse model. To investigate the role of HSP70-2 in ovarian cancer, plasmid driven short hairpin RNA approach was used to examine HSP70-2 gene and protein expression in ovarian cancer cell line A-10 (origin: serous papillary cystadenocarcinoma), Caov-3 (origin: adenocarcinoma) and SKOV3 (origin: adenocarcinoma; derived from metastatic site: ascites) by RT-PCR, quantitative-PCR, immunohistochemistry and Western blotting...
2017: American Journal of Cancer Research
https://www.readbyqxmd.com/read/28665613/conformational-heterogeneity-and-the-role-of-the-c-2-h-donor-in-mono-and-dihydrated-clusters-of-benzoxazole
#12
Aditi Bhattacherjee, Sanjay J Wategaonkar
The significance of the heteroatom in influencing the acidity and binding affinity of the C(2)-H donor in five-membered heterocyclic rings is explored. The water clusters of benzoxazole (BOX) are studied in a supersonic jet by IR-UV double resonance spectroscopy and compared with those of benzimidazole (BIM) and its N-methyl derivative (MBIM). Two conformers are identified for the monohydrated cluster, both of which are O-H∙∙∙N bound and differ in their orientation with respect to the intermolecular hydrogen bond...
June 30, 2017: Journal of Physical Chemistry. A
https://www.readbyqxmd.com/read/28655132/fstl1-contributes-to-tumor-progression-via-attenuating-apoptosis-in-a-akt-gsk-3%C3%AE-dependent-manner-in-hepatocellular-carcinoma
#13
Wei Yang, Yaqi Wu, Cong Wang, Zhikui Liu, Meng Xu, Xin Zheng
BACKGROUND: Several investigations have demonstrated that follistatin-like 1 (FSTL1) is implicated in the initiation and progression of diverse cancers. It remains unclear whether FSTL1 acted as a cancer-promoting gene through its overexpression in HCC. PATIENTS AND METHODS: We detected FSTL1 protein expression in 210 consecutive HCC cases curatively resected in our hospital between 2004 and 2007. The correlation between FSTL1 expression in HCC tissues and post-surgical prognosis of HCCs was analyzed...
May 26, 2017: Cancer Biomarkers: Section A of Disease Markers
https://www.readbyqxmd.com/read/28652304/thymic-progenitors-of-tcr%C3%AE-%C3%AE-cd8%C3%AE-%C3%AE-intestinal-intraepithelial-lymphocytes-require-rasgrp1-for-development
#14
Dominic P Golec, Romy E Hoeppli, Laura M Henao Caviedes, Jillian McCann, Megan K Levings, Troy A Baldwin
Strong T cell receptor (TCR) signaling largely induces cell death during thymocyte development, whereas weak TCR signals induce positive selection. However, some T cell lineages require strong TCR signals for differentiation through a process termed agonist selection. The signaling relationships that underlie these three fates are unknown. RasGRP1 is a Ras activator required to transmit weak TCR signals leading to positive selection. Here, we report that, despite being dispensable for thymocyte clonal deletion, RasGRP1 is critical for agonist selection of TCRαβ(+)CD8αα intraepithelial lymphocyte (IEL) progenitors (IELps), even though both outcomes require strong TCR signaling...
June 26, 2017: Journal of Experimental Medicine
https://www.readbyqxmd.com/read/28648139/mutagenic-analysis-of-an-adeno-associated-virus-variant-capable-of-simultaneously-promoting-immune-resistance-and-robust-gene-delivery
#15
Yoojin Kim, Eunmi Kim, Seokmin Oh, Ye-Eun Yoon, Jae-Hyung Jang
In addition to the ability to boost gene delivery efficiency in many therapeutically relevant cells, the capability of circumventing neutralizing antibody (NAb) inactivation is a key prerequisite that gene carriers must fulfill for their extensive applications as therapeutic agents in many gene therapy trials, especially for cancer treatments. This study revealed that a genetically engineered adeno-associated viral (AAV) variant, AAVr3.45, inherently possesses dual beneficial properties as a gene carrier: i) efficiently delivering therapeutic genes to many clinically valuable cells (e...
June 24, 2017: Human Gene Therapy
https://www.readbyqxmd.com/read/28647135/ultrasound-dependent-cytoplasmic-internalization-of-a-peptide-sonosensitizer-conjugate
#16
Yuki Inaba, Kazunori Watanabe, Mizuki Kitamatsu, Eiji Nakata, Atsushi Harada, Takashi Ohtsuki
A method to induce cytoplasmic peptide delivery, using ultrasound, was demonstrated using a molecular conjugate of a cell-penetrating peptide (CPP), a functional peptide, and a sonosensitizer. As a model of such molecular conjugates, TatBim-RB, consisting of the Tat CPP, the Bim apoptosis inducing peptide, and the sonosensitizer rose bengal was synthesized. CPPs have been widely used for intracellular delivery of various cargos; however, CPP-fused molecules tend to become entrapped in endosomes, as was observed for TatBim-RB molecules applied to cells...
June 15, 2017: Bioorganic & Medicinal Chemistry
https://www.readbyqxmd.com/read/28642847/heat-labile-enterotoxin-induced-perk-chop-pathway-activation-causes-intestinal-epithelial-cell-apoptosis
#17
Xi Lu, Chunmeng Li, Congcong Li, Pengcheng Li, Enqing Fu, Yonghong Xie, Faguang Jin
Enterotoxigenic Escherichia coli (ETEC) is a leading cause of diarrhea among children and travelers in developing countries, and heat-labile enterotoxin (LT) is one of the most important virulence factors. The pathogenesis of and virulence factors associated with ETEC have been well-characterized; however, the extent to which ETEC damages host cells remains unclear. In this study, we found that LT could induce decreases in intestinal epithelial cell viability and induce apoptosis in a dose- and time- dependent manner in both HCT-8 and Caco-2 cells...
2017: Frontiers in Cellular and Infection Microbiology
https://www.readbyqxmd.com/read/28641145/lack-of-association-between-deletion-polymorphism-of-bim-gene-and-in-vitro-drug-sensitivity-in-b-cell-precursor-acute-lymphoblastic-leukemia
#18
Meixian Huang, Kunio Miyake, Keiko Kagami, Masako Abe, Tamao Shinohara, Atsushi Watanabe, Shinpei Somazu, Hiroko Oshiro, Kumiko Goi, Hiroaki Goto, Masayoshi Minegishi, Shotaro Iwamoto, Nobutaka Kiyokawa, Kanji Sugita, Takeshi Inukai
A deletion polymorphism in the BIM gene was identified as an intrinsic mechanism for resistance to tyrosine kinase inhibitor in chronic myeloid leukemia patients in East Asia. BIM is also involved in the responses to glucocorticoid and chemotherapy in acute lymphoblastic leukemia (ALL), suggesting a possible association between deletion polymorphism of BIM and the chemosensitivity of ALL. Thus, we analyzed 72 B-cell precursor (BCP)-ALL cell lines established from Japanese patients. Indeed, higher BIM gene expression was associated with good in vitro sensitivities to glucocorticoid and chemotherapeutic agents used in induction therapy...
June 4, 2017: Leukemia Research
https://www.readbyqxmd.com/read/28629051/novel-biomimetic-composite-material-for-potentiometric-screening-of-acetylcholine-a-neurotransmitter-in-alzheimer-s-disease
#19
Ana S Sacramento, Felismina T C Moreira, Joana L Guerreiro, Ana P Tavares, M Goreti F Sales
This work describes a novel approach to produce an antibody-like biomimetic material. It includes preparing composite imprinted material never presented before, with highly conductive support nanostructures and assembling a high conductivity polymeric layer at low temperature. Overall, such highly conductive material may enhance the final features of electrically-based devices. Acetylcholine (ACh) was selected as target analyte, a neurotransmitter of importance in Alzheimer's disease. Potentiometric transduction was preferred, allowing quick responses and future adaptation to point-of-care requirements...
October 1, 2017: Materials Science & Engineering. C, Materials for Biological Applications
https://www.readbyqxmd.com/read/28624794/knockdown-of-hdac1-expression-suppresses-invasion-and-induces-apoptosis-in-glioma-cells
#20
Xiao-Qiang Wang, Hong-Min Bai, Shi-Ting Li, Hui Sun, Ling-Zhao Min, Bang-Bao Tao, Jun Zhong, Bin Li
Glioma is the most common malignant tumor of the central nervous system, with a low survival rate of five years worldwide. Although high expression and prognostic value of histone deacetylase 1 (HDAC1) have been recently reported in various types of human tumors, the molecular mechanism underlying the biological function of HDAC1 in glioma is still unclear. We found that HDAC1 was elevated in glioma tissues and cell lines. HDAC1 expression was closely related with pathological grade and overall survival of patients with gliomas...
May 26, 2017: Oncotarget
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