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https://www.readbyqxmd.com/read/27915452/chronic-enalapril-treatment-increases-transient-outward-potassium-current-in-cardiomyocytes-isolated-from-right-ventricle-of-spontaneously-hypertensive-rats
#1
Luiz Fernando Rodrigues Junior, Ana Carolina de Azevedo Carvalho, Enildo Broetto Pimentel, José Geraldo Mill, José Hamilton Matheus Nascimento
It has been well established that chronic pressure overload resulting from hypertension leads to ventricular hypertrophy and electrophysiological remodeling. The transient outward potassium current (I to) reduction described in hypertensive animals delays ventricular repolarization, leading to complex ventricular arrhythmias and sudden death. Antihypertensive drugs, as angiotensin-converting enzyme inhibitors (ACEi), can restore I to and reduce the incidence of arrhythmic events. The purpose of this study was to evaluate the differential effects of long-term treatment with ACEi or direct-acting smooth muscle relaxant on the I to of left and right ventricle myocytes of spontaneously hypertensive rats (SHR)...
December 3, 2016: Naunyn-Schmiedeberg's Archives of Pharmacology
https://www.readbyqxmd.com/read/27915418/in-vivo-cns-infection-model-of-acanthamoeba-genotype-t4-the-early-stages-of-infection-lack-presence-of-host-inflammatory-response-and-are-a-slow-and-contact-dependent-process
#2
Maritza Omaña-Molina, Dolores Hernandez-Martinez, Raquel Sanchez-Rocha, Ulises Cardenas-Lemus, Citlaltepetl Salinas-Lara, Adolfo Rene Mendez-Cruz, Laura Colin-Barenque, Patricia Aley-Medina, Jesus Espinosa-Villanueva, Leticia Moreno-Fierros, Jacob Lorenzo-Morales
This study was developed in order to describe the early morphological events observed during the invasion of two pathogenic strains of Acanthamoeba (genotype T4); A. castellanii and A. culbertsoni, at the olfactory meatus and cerebral, pulmonary, renal, hepatic and splenic tissues levels, an in vivo invasion study. Histological and immunohistochemical description of the events at 24, 48, 72, and 96 h postintranasal inoculations of BALB/c mice was performed. A. castellanii showed a higher invasion rate than A...
December 3, 2016: Parasitology Research
https://www.readbyqxmd.com/read/27915415/exendin-4-protects-huvecs-from-tunicamycin-induced-apoptosis-via-inhibiting-the-ire1a-jnk-caspase-3-pathway
#3
Li Wu, XiaoYing Liu, LinXi Wang, YanPing Wang, LiJing Wang, BinBin Guan, Zhou Chen, LiBin Liu
PURPOSE: The abnormal increase of apoptosis of endothelial cells induced by endoplasmic reticulum stress is a significant factor for vascular disease, especially for atherosclerosis. Protecting endothelial cells from endoplasmic reticulum stress is a crucial strategies to combate these diseases. The goal of this study was to explore the effect of Exendin-4, a glucagon-like peptide-1 receptor agonist, on tunicamycin-induced apoptosis in human umbilical vein endothelial cells. METHODS: All studies were performed in primary human umbilical vein endothelial cells treated with tunicamycin with or without Exendin-4 pretreatment...
December 3, 2016: Endocrine
https://www.readbyqxmd.com/read/27915394/timelines-of-the-free-particle-and-fixed-particle-models-of-stone-formation-theoretical-and-experimental-investigations
#4
REVIEW
D J Kok, W Boellaard, Y Ridwan, V A Levchenko
Two major theories on renal stone formation will be reviewed, the "free-particle" and "fixed-particle" mechanisms. These theories combine data on intrinsic factors (inborn metabolic errors), extrinsic factors (diet), renal cell responses and the physico-chemistry and biochemistry of urine into mechanisms of stone formation. This paper describes the specific role of time in both mechanisms. The timeline of crystal- and stone formation was deducted from literature data and was measured for two stones using radioisotope decay analysis...
December 3, 2016: Urolithiasis
https://www.readbyqxmd.com/read/27915375/identification-of-enzymes-responsible-for-extracellular-alginate-depolymerization-and-alginate-metabolism-in-vibrio-algivorus
#5
Hidetaka Doi, Yuriko Tokura, Yukiko Mori, Kenichi Mori, Yoko Asakura, Yoshihiro Usuda, Hiroo Fukuda, Akito Chinen
Alginate is a marine non-food-competing polysaccharide that has potential applications in biorefinery. Owing to its large size (molecular weight >300,000 Da), alginate cannot pass through the bacterial cell membrane. Therefore, bacteria that utilize alginate are presumed to have an enzyme that degrades extracellular alginate. Recently, Vibrio algivorus sp. SA2(T) was identified as a novel alginate-decomposing and alginate-utilizing species. However, little is known about the mechanism of alginate degradation and metabolism in this species...
December 3, 2016: Applied Microbiology and Biotechnology
https://www.readbyqxmd.com/read/27915346/mir-181a-targets-phlpp2-to-augment-akt-signaling-and-regulate-proliferation-and-apoptosis-in-human-keloid-fibroblasts
#6
Zhen Rang, Zong-Yang Wang, Qiu-Yu Pang, You-Wei Wang, Ge Yang, Fan Cui
BACKGROUND/AIMS: Keloids are fibrous overgrowths induced by cutaneous injury. MicroRNAs (miRNAs) have recently emerged as post-transcriptional gene repressors and participants in a diverse array of pathophysiological processes leading to skin disease. The purpose of the current study was to explore the precise functions of miR-181a in human keloid development and the underlying mechanisms. METHODS: A miRNA microarray analysis was performed to compare expression profiles between keloid and normal skin tissues...
December 5, 2016: Cellular Physiology and Biochemistry
https://www.readbyqxmd.com/read/27915273/altered-mirna-expression-in-high-fat-diet-induced-prostate-cancer-progression
#7
Taketoshi Nara, Shintaro Narita, Huang Mingguo, Toshiaki Yoshioka, Atsushi Koizumi, Kazuyuki Numakura, Hiroshi Tsuruta, Atsushi Maeno, Mitsuru Saito, Takamitsu Inoue, Norihiko Tsuchiya, Shigeru Satoh, Tomonori Habuchi
Recent evidence suggests that a high-fat diet (HFD) plays an important role in prostate carcinogenesis; however, underlying mechanisms largely remain unknown. Here, we investigated microRNA (miRNA) expression changes in murine prostate cancer (PCa) xenografts using two different diets: HFD and control diet. We then assessed the roles and targets of altered miRNAs in HFD-induced PCa progression. We identified 38 up- and 21 downregulated miRNAs in xenografts under HFD conditions using the miRCURY LNA™ microRNA array...
December 2016: Carcinogenesis
https://www.readbyqxmd.com/read/27915255/theoretical-and-experimental-evidence-for-eliminating-persister-bacteria-by-manipulating-killing-timing
#8
N G Cogan, H Rath, N Kommerein, S N Stumpp, M Stiesch
Formation of a transient sub-population of bacteria, referred to as persisters, is one of the most important and least understood mechanisms that bacteria employ to evade elimination. Persister cells appear to be slow growing bacteria that are broadly protected from a wide range of antibiotics. Using both theoretical and experimental methods, we show that alternating the application and withdrawal of antibiotics can be an effective treatment - as long as the timing of the protocol is estimated with precision...
December 2, 2016: FEMS Microbiology Letters
https://www.readbyqxmd.com/read/27915254/ompf-of-pectobacterium-carotovorum-subsp-carotovorum-pcc3-is-required-for-carocin-d-sensitivity
#9
Jeong-A Lim, Jisoo Hong, Jonguk Kim, Sunggi Heu, Eunjung Roh
Carocin D is a bacteriocin produced by Pectobacterium carotovorum subsp. carotovorum Pcc21. Carocin D inhibits the growth of P carotovorum subsp. carotovorum and closely related strains, P carotovorum subsp. carotovorum is causative bacteria for soft rot disease and leads to severe economic losses. Bacteriocins recognize and interact with a specific membrane protein of target bacteria as a receptor. To identify the receptor responsible for carocin D recognition, mutants that underwent a phenotypic change from carocin D-sensitivity to carocin D-insensitivity were screened...
December 2, 2016: FEMS Microbiology Letters
https://www.readbyqxmd.com/read/27915242/distinct-mechanisms-of-mutant-huntingtin-toxicity-in-different-yeast-strains
#10
Genrikh V Serpionov, Alexander I Alexandrov, Michael D Ter-Avanesyan
Expansion of polyglutamine stretches in several proteins cause neurodegenerative amyloidoses, including Huntington disease. In yeast, mutant huntingtin (mHtt) with a stretch of 103 glutamine residues (HttQ103) forms toxic aggregates. A range of yeast strains have been used to elucidate the mechanisms of mHtt toxicity, and have revealed perturbations of various unrelated processes. HttQ103 aggregates can induce aggregation of cellular proteins, many of which contain glutamine/asparagine-rich regions, including Sup35 and Def1...
December 2, 2016: FEMS Yeast Research
https://www.readbyqxmd.com/read/27915233/molecular-basis-for-the-autonomous-promotion-of-cell-proliferation-by-angiogenin
#11
Trish T Hoang, Ronald T Raines
Canonical growth factors act indirectly via receptor-mediated signal transduction pathways. Here, we report on an autonomous pathway in which a growth factor is internalized, has its localization regulated by phosphorylation, and ultimately uses intrinsic catalytic activity to effect epigenetic change. Angiogenin (ANG), a secreted vertebrate ribonuclease, is known to promote cell proliferation, leading to neovascularization as well as neuroprotection in mammals. Upon entering cells, ANG encounters the cytosolic ribonuclease inhibitor protein, which binds with femtomolar affinity...
December 2, 2016: Nucleic Acids Research
https://www.readbyqxmd.com/read/27915217/human-cells-involved-in-atherosclerosis-have-a-sex
#12
REVIEW
Flavia Franconi, Giuseppe Rosano, Stefania Basili, Andrea Montella, Ilaria Campesi
The influence of sex has been largely described in cardiovascular diseases. Atherosclerosis is a complex process that involves many cell types such as vessel cells, immune cells and endothelial progenitor cells; however, many, if not all, studies do not report the sex of the cells. This review focuses on sex differences in human cells involved in the atherosclerotic process, emphasizing the role of sex hormones. Furthermore, we report sex differences and issues related to the processes that determine the fate of the cells such as apoptotic and autophagic mechanisms...
November 9, 2016: International Journal of Cardiology
https://www.readbyqxmd.com/read/27915209/development-of-neural-population-activity-towards-self-organized-criticality
#13
Yuichiro Yada, Takeshi Mita, Akihiro Sanada, Ryuichi Yano, Ryohei Kanzaki, Douglas J Bakkum, Andreas Hierlemann, Hirokazu Takahashi
Self-organized criticality (SoC), a spontaneous dynamic state established and maintained in networks of moderate complexity, is a universal characteristic of neural systems. Such systems produce cascades of spontaneous activity that are typically characterized by power-law distributions and rich, stable spatiotemporal patterns (i.e., neuronal avalanches). Since the dynamics of the critical state confer advantages in information processing within neuronal networks, it is of great interest to determine how criticality emerges during development...
November 30, 2016: Neuroscience
https://www.readbyqxmd.com/read/27915154/lipopolysaccharides-stimulated-macrophage-products-enhance-withaferin-a-induced-apoptosis-via-activation-of-caspases-and-inhibition-of-nf-%C3%AE%C2%BAb-pathway-in-human-cancer-cells
#14
Liang Piao, Zhao Canguo, Lu Wenjie, Cheng Xiaoli, Shi Wenli, Lu Li
Macrophages, as a major cellular component in tumor microenvironment, play an important role in tumor progression. However, their roles in modulation of cytotoxic chemotherapy are still not fully understood. Here, we investigated the influence of Lipoplysaccharides (LPS)-stimulated macrophage products (LSMP) on Withaferin A (WA), a natural compound that derived from the medicinal plant Withania somnifera, as an antitumor agent in human breast cancer cells MDA-MB-231 and prostate cancer cells PC-3. Our results revealed that LSMP may enhance WA-induced apoptosis in both cell lines, the underlying mechanisms of which are closely associated with activation of caspase-8, -9 and -3, cleavage of poly ADP-ribose polymerase (PARP), as well as specifically inhibiting the translocation of nuclear factor-κB (NF-κB) and down-regulation of anti-apoptotic proteins X-linked inhibitor of apoptosis protein (XIAP) and inhibitor of apoptosis protein (cIAP1/2)...
December 1, 2016: Molecular Immunology
https://www.readbyqxmd.com/read/27915146/differential-sensitivity-to-cadmium-of-immunomarkers-measured-in-hemocyte-subpopulations-of-zebra-mussel-dreissena-polymorpha
#15
Lauris Evariste, Damien Rioult, Pauline Brousseau, Alain Geffard, Elise David, Michel Auffret, Michel Fournier, Stéphane Betoulle
Increasing discharge of industrial wastes into the environment results in pollution transfer towards hydrosystems. These activities release heavy metals such as cadmium, known as persistent pollutant that is accumulated by molluscs and exercise immunotoxicological effects. Among molluscs, the zebra mussel, Dreissena polymorpha constitutes a suitable support for freshwater ecotoxicological studies. In molluscs, homeostasis maintain is ensured in part by hemocytes that are composed of several cell populations involved in multiple physiological processes such as cell-mediated immune response or metal metabolism...
December 1, 2016: Ecotoxicology and Environmental Safety
https://www.readbyqxmd.com/read/27915139/impairment-of-fetal-hematopoietic-stem-cell-function-in-the-absence-of-fancd2
#16
Sakiko Suzuki, Ronny R Racine, Nathan A Manalo, Sharon B Cantor, Glen D Raffel
Fanconi Anemia (FA), results from mutations in genes necessary for DNA damage repair and often leads to progressive bone marrow failure. Although the exhaustion of the bone marrow leads to cytopenias in FA patients as they age, evidence from human FA and mouse model fetal livers suggests hematopoietic defects originate in utero which may lead to deficient seeding of the bone marrow. To address this possibility, we examined the consequences of loss of Fancd2, a central component of the FA pathway. Examination of E14...
November 30, 2016: Experimental Hematology
https://www.readbyqxmd.com/read/27915054/curdione-attenuates-thrombin-induced-human-platelet-activation-%C3%AE-1-tubulin-as-a-potential-therapeutic-target
#17
Dongling Zhang, Wenhao Qiao, Yingli Zhao, Hui Fang, Dujuan Xu, Quan Xia
Rhizoma Curcumae, the dry rhizomes derived from Curcuma aromatica Salisb., are a classical Chinese medicinal herb used to activate blood circulation, remove blood stasis and alleviate pain. Our previous study proved that curdione, a sesquiterpene compound isolated from the essential oil of Curcuma aromatica Salisb. can inhibit platelet activation suggesting its significant anticoagulant and antithrombotic effects. However, the underlying mechanism of curdione mediated anti-platelet effect has not been fully elucidated...
November 30, 2016: Fitoterapia
https://www.readbyqxmd.com/read/27915049/csn1201-a-subunit-of-the-cop9-signalosome-regulates-the-virulence-in-cryptococcus-neoformans-infection
#18
Yibin Fan, Xiaohua Tao, Weili Pan, Wei Fang, Youming Huang, Mingyan Jia
The COP9 signalosome (CSN) is a multisubunit protein complex, and it now has been found to participate in diverse cellular and developmental processes in various eukaryotic organisms. Cryptococcus neoformans (C. neoformans) is an important basidiomycete pathogen that causes life-threatening meningoencephalitis primarily in the immune compromised population. Here, we generated CSN deletion mutants to investigate the role in Cryptococcus infection. Compared to other CSN mutants, we identified a CSN1201 mutant exhibited severely attenuated virulence...
November 30, 2016: Fungal Genetics and Biology: FG & B
https://www.readbyqxmd.com/read/27915046/dna-damage-related-crosstalk-between-the-nucleus-and-mitochondria
#19
Mohammad Saki, Aishwarya Prakash
The electron transport chain is the primary pathway by which a cell generates energy in the form of ATP. Byproducts of this process produce reactive oxygen species that can cause damage to mitochondrial DNA. If not properly repaired, the accumulation of DNA damage can lead to mitochondrial dysfunction linked to several human disorders including neurodegenerative diseases and cancer. Mitochondria are able to combat oxidative DNA damage via repair mechanisms that are analogous to those found in the nucleus. Of the repair pathways currently reported in the mitochondria, the base excision repair pathway is the most comprehensively described...
November 30, 2016: Free Radical Biology & Medicine
https://www.readbyqxmd.com/read/27915024/extracellular-matrix-hydrogels-from-decellularized-tissues-structure-and-function
#20
REVIEW
Lindsey T Saldin, Madeline C Cramer, Sachin S Velankar, Lisa J White, Stephen F Badylak
: Extracellular matrix (ECM) bioscaffolds prepared from decellularized tissues have been used to facilitate constructive and functional tissue remodeling in a variety of clinical applications. The discovery that these ECM materials could be solubilized and subsequently manipulated to form hydrogels expanded their potential in vitro and in vivo utility; i.e. as culture substrates comparable to collagen or Matrigel, and as injectable materials that fill irregularly-shaped defects. The mechanisms by which ECM hydrogels direct cell behavior and influence remodeling outcomes are only partially understood, but likely include structural and biological signals retained from the native source tissue...
November 30, 2016: Acta Biomaterialia
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