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https://www.readbyqxmd.com/read/29341323/test-retest-reliability-and-longitudinal-analysis-of-automated-hippocampal-subregion-volumes-in-healthy-ageing-and-alzheimer-s-disease-populations
#1
Amanda Worker, Danai Dima, Anna Combes, William R Crum, Johannes Streffer, Steven Einstein, Mitul A Mehta, Gareth J Barker, Steve C R Williams, Owen O'daly
The hippocampal formation is a complex brain structure that is important in cognitive processes such as memory, mood, reward processing and other executive functions. Histological and neuroimaging studies have implicated the hippocampal region in neuropsychiatric disorders as well as in neurodegenerative diseases. This highly plastic limbic region is made up of several subregions that are believed to have different functional roles. Therefore, there is a growing interest in imaging the subregions of the hippocampal formation rather than modelling the hippocampus as a homogenous structure, driving the development of new automated analysis tools...
January 16, 2018: Human Brain Mapping
https://www.readbyqxmd.com/read/29339537/stat3-pias3-levels-serve-as-early-signature-genes-in-the-development-of-high-grade-serous-carcinoma-from-the-fallopian-tube
#2
Uksha Saini, Adrian A Suarez, Shan Naidu, John J Wallbillich, Kristin Bixel, Ross Wanner, Jason Bice, Raleigh D Kladney, Jenny Lester, Beth Y Karlan, Paul J Goodfellow, David E Cohn, Karuppaiyah Selvendiran
The initial molecular events that lead to malignant transformation of the fimbria of the fallopian tube (FT) through high-grade serous ovarian carcinoma (HGSC) remain poorly understood. In this study, we report that increased expression of signal transducer and activator of transcription 3 (pSTAT3 Tyr705) and suppression or loss of protein inhibitor of activated STAT3 (PIAS3) in FT likely drive HGSC. We evaluated human tissues-benign normal FT, tubal peritoneal junction (TPJ), p53 signature fallopian tube tissue, tubal intraepithelial lesion in transition (TILT), serous tubal intraepithelial carcinoma (STIC) without ovarian cancer, and HGSC for expression of STAT3/PIAS3 (compared with their known TP53 signature) and their target proliferation genes...
January 16, 2018: Cancer Research
https://www.readbyqxmd.com/read/29330179/influence-of-type-i-fimbriae-and-fluid-shear-stress-on-bacterial-behavior-and-multicellular-architecture-of-early-escherichia-coli-biofilms-at-single-cell-resolution
#3
Liyun Wang, Robert Keatch, Qi Zhao, John A Wright, Clare E Bryant, Anna L Redmann, Eugene M Terentjev
Biofilm formation on abiotic surfaces in food and medical industry can cause severe contamination and infection, yet how biological and physical factors determine cellular architecture of early biofilms and bacterial behavior of the constituent cells remains largely unknown. In this study we examine the specific role of type-I fimbriae in nascent stages of biofilm formation and the response of micro-colonies to environmental flow shear at single-cell resolution. The results show that type-I fimbriae are not required for reversible adhesion from plankton, but critical for irreversible adhesion of Escherichia coli (E...
January 12, 2018: Applied and Environmental Microbiology
https://www.readbyqxmd.com/read/29327265/successful-diagnosis-of-an-occult-fallopian-tube-carcinoma-detected-from-the-diaphragm-metastasis
#4
Takahide Toyoda, Hidemi Suzuki, Takahiro Nakajima, Takekazu Iwata, Ayumu Matsuoka, Kyoko Nishikimi, Yoko Yonemori, Makio Shozu, Yukio Nakatani, Ichiro Yoshino
We herein reported a rare case of an occult fallopian tube carcinoma first detected from the diaphragm metastasis. An 83-year-old woman who had a 30-mm tumor on the right diaphragm underwent radical resection. Pathologically, the tumor was diagnosed as a high-grade serous adenocarcinoma, suggesting metastasis from the pelvic visceral carcinoma. Although the primary site could not be detected by imaging examinations, laparoscopy revealed multiple peritoneal disseminations; therefore, total hysterectomy was performed...
January 11, 2018: General Thoracic and Cardiovascular Surgery
https://www.readbyqxmd.com/read/29325882/pathophysiology-of-escherichia-coli-pneumonia-respective-contribution-of-pathogenicity-islands-to-virulence
#5
Mathilde Phillips-Houlbracq, Jean-Damien Ricard, Arnaud Foucrier, Deborah Yoder-Himes, Stéphane Gaudry, Julie Bex, Jonathan Messika, Dimitri Margetis, Jérémie Chatel, Ulrich Dobrindt, Erick Denamur, Damien Roux
Ventilator-associated pneumonia (VAP) remains the most frequent life-threatening nosocomial infection. Enterobacteriaceae including Escherichia coli are increasingly involved. If a cumulative effect of pathogenicity islands (PAIs) has been shown for E. coli virulence in urinary tract or systemic infections, very little is known regarding pathophysiology of E. coli pneumonia. This study aimed to determine the role of each of the 7 PAIs present in pathogenic E. coli strain 536 in pneumonia pathophysiology. We used mutant strains to screen pathophysiological role of PAI in a rat pneumonia model...
January 5, 2018: International Journal of Medical Microbiology: IJMM
https://www.readbyqxmd.com/read/29297821/isolation-identification-and-genome-analysis-of-lung-pathogenic-klebsiella-pneumoniae-lpkp-in-forest-musk-deer
#6
Wei Zhao, Qing Tian, Yan Luo, Yin Wang, Ze-Xiao Yang, Xue-Ping Yao, Jian-Guo Cheng, Xin Zhou, Wu-You Wang
Klebsiella pneumoniae is an important pathogen commonly associated with opportunistic infections. In this study, lung pathogenic K. pneumoniae (LPKP) was isolated and identified from suppurative pneumoniae in forest musk deer by conventional methods and by 16S ribosomal RNA sequence analysis. Median lethal dose and histopathologic analysis were used to demonstrate pathogenicity of the organism in mice. Furthermore, a draft genome of LPKP was sequenced, and its virulence genes were detected. One hundred and twenty-two virulence genes encoded determinant of capsule polysaccharide (CPS), lipopolysaccharide, fimbriae, outer membrane proteins, iron acquisition, and urease...
December 2017: Journal of Zoo and Wildlife Medicine: Official Publication of the American Association of Zoo Veterinarians
https://www.readbyqxmd.com/read/29287240/label-free-impedimetric-glycan-biosensor-for-quantitative-evaluation-interactions-between-pathogenic-bacteria-and-mannose
#7
Feiyun Cui, Yi Xu, Renjie Wang, Haitao Liu, Li Chen, Qing Zhang, Xiaojing Mu
In order to understanding the pathogenic mechanism of infectious diseases, it was important to study the selective recognition and interaction between pathogenic bacteria and host cells. In this paper, a novel electrochemical impedance biosensor was proposed, in which the Man/MUA-MH/Au sensing surface (Man: mannose; MUA: 11-mercapto eleven acid; MH: 6-mercapto hexanol) was fabricated and was of good biologically active and stability. The capture capacity of the designed sensing surface for S. typhimurium ATCC14028, E...
December 2, 2017: Biosensors & Bioelectronics
https://www.readbyqxmd.com/read/29278888/healthy-versus-entorhinal-cortical-atrophy-identification-in-asymptomatic-apoe4-carriers-at-risk-for-alzheimer-s-disease
#8
Kyoko Konishi, Ridha Joober, Judes Poirier, Kathleen MacDonald, Mallar Chakravarty, Raihaan Patel, John Breitner, Véronique D Bohbot
Early detection of Alzheimer's disease (AD) has been challenging as current biomarkers are invasive and costly. Strong predictors of future AD diagnosis include lower volume of the hippocampus and entorhinal cortex, as well as the ɛ4 allele of the Apolipoprotein E gene (APOE) gene. Therefore, studying functions that are critically mediated by the hippocampus and entorhinal cortex, such as spatial memory, in APOE ɛ4 allele carriers, may be key to the identification of individuals at risk of AD, prior to the manifestation of cognitive impairments...
December 16, 2017: Journal of Alzheimer's Disease: JAD
https://www.readbyqxmd.com/read/29250041/stenotrophomonas-maltophilia-as-an-emerging-ubiquitous-pathogen-looking-beyond-contemporary-antibiotic-therapy
#9
REVIEW
Anthony A Adegoke, Thor A Stenström, Anthony I Okoh
Stenotrophomonas maltophilia is a commensal and an emerging pathogen earlier noted in broad-spectrum life threatening infections among the vulnerable, but more recently as a pathogen in immunocompetent individuals. The bacteria are consistently being implicated in necrotizing otitis, cutaneous infections including soft tissue infection and keratitis, endocarditis, meningitis, acute respiratory tract infection (RTI), bacteraemia (with/without hematological malignancies), tropical pyomyositis, cystic fibrosis, septic arthritis, among others...
2017: Frontiers in Microbiology
https://www.readbyqxmd.com/read/29228178/genome-sequence-analysis-of-a-hypermucoviscous-hypervirulent-and-mdr-ctx-m-15-k19-st29-klebsiella-pneumoniae-isolated-from-human-infection
#10
Quézia Moura, Fernanda Esposito, Miriam R Fernandes, Maria Espinoza-Muñoz, Tiago A Souza, Silvia R Santos, Louise Cerdeira, Valéria Cassettari, Nilton Lincopan
The emergence of hypervirulent Klebsiella pneumoniae (hvKP) with multidrug-resistance (MDR) profile is a worrisome public health issue. We report the first draft genome sequence of a hypermucoviscous (positive string test) and MDR K. pneumoniae serotype K19, belonging to ST29, isolated from human infection. This strain harboured multiple antimicrobial resistance genes, including blaCTX-M-15, besides yersiniabactin and type 3 fimbriae virulence genes. In vivo experiments carried out with the Galleria mellonella infection model revealed that K...
December 6, 2017: Pathogens and Disease
https://www.readbyqxmd.com/read/29213305/a-multiplexed-magnetic-tweezer-with-precision-particle-tracking-and-bi-directional-force-control
#11
Keith C Johnson, Emilie Clemmens, Hani Mahmoud, Robin Kirkpatrick, Juan C Vizcarra, Wendy E Thomas
Background: In the past two decades, methods have been developed to measure the mechanical properties of single biomolecules. One of these methods, Magnetic tweezers, is amenable to aquisition of data on many single molecules simultaneously, but to take full advantage of this "multiplexing" ability, it is necessary to simultaneously incorprorate many capabilities that ahve been only demonstrated separately. Methods: Our custom built magnetic tweezer combines high multiplexing, precision bead tracking, and bi-directional force control into a flexible and stable platform for examining single molecule behavior...
2017: Journal of Biological Engineering
https://www.readbyqxmd.com/read/29212851/omics-of-bifidobacteria-research-and-insights-into-their-health-promoting-activities
#12
REVIEW
Francesca Bottacini, Douwe van Sinderen, Marco Ventura
Members of the genus Bifidobacterium include gut commensals that are particularly abundant among the microbial communities residing in the gut of healthy breast-fed infants, where their presence has been linked to many beneficial host effects. Next-generation DNA sequencing and comparative and functional genome methodologies have been shown to be particularly useful in exploring the diversity of this genus. These combined approaches have allowed the identification of genetic features related to bifidobacterial establishment in the gut, involving host-microbe as well as microbe-microbe interactions...
December 6, 2017: Biochemical Journal
https://www.readbyqxmd.com/read/29209300/molecular-characteristics-of-st1193-clone-among-phylogenetic-group-b2-non-st131-fluoroquinolone-resistant-escherichia-coli
#13
Jing Wu, Fangjun Lan, Yanfang Lu, Qingwen He, Bin Li
Objectives: Sequence type 1193 is emerging as a new, virulent and resistant lineage among fluoroquinolone resistant Escherichia coli (FQrE. coli). In this study, we investigated the prevalence and molecular characteristics of this clone isolated from a Chinese university hospital. Methods: 73 phylogenetic group B2-FQr-non-ST131 isolates were collected from August 2014 and August 2015 at a Chinese university hospital. Isolates were screened for ST1193 by multilocus sequence typing. E. coli ST1193 then underwent lactose fermentation determination, susceptibility testing, virulence genotyping, PCR-based O typing, pulsed-field gel electrophoresis (PFGE) and FQr mechanism analysis...
2017: Frontiers in Microbiology
https://www.readbyqxmd.com/read/29208873/correlation-between-seropositivity-of-chlamydia-trachomatis-and-tubal-and-or-pelvic-pathology-detected-by-diagnostic-laparoscopy-in-subfertile-women
#14
N Begum, S A Anwary, M Alfazzaman, Z Mahzabin, F Deeba, M A Mostafa, M Akhter, M M Rahman
This prospective observational study was carried out in the Infertility Unit, Department of Obstetrics and Gynaecology, Bangabandhu Sheikh Mujib Medical University (BSMMU), Dhaka, from February 2011 to December 2013. Sixty-nine (69) subfertile women who were seropositive for Chlamydia Trachomatis were included in this study. Inclusion criteria was patients with sub-fertility having age between 22 and 40 years, seeking infertility treatment, normal ovarian function, all normozoospermic male partner, duration of infertility ranged from 1...
October 2017: Mymensingh Medical Journal: MMJ
https://www.readbyqxmd.com/read/29202487/maillard-neoglycans-as-inhibitors-for-in-vitro-adhesion-of-f4-enterotoxigenic-escherichia-coli-to-piglet-intestinal-cells
#15
Héctor Manuel Sarabia-Sainz, Verónica Mata Haro, José Andre-I Sarabia Sainz, Luz Vázquez-Moreno, Gabriela Ramos-Clamont Montfort
Adhesion of enterotoxigenic (ETEC) E. coli to host intestinal cells is mediated by lectin-like fimbriae that bind to specific glycan moieties on the surfaces of enterocytes. To prevent in vitro binding of E. coli F4 fimbriae (F4 ETEC+) to piglet enterocytes, neoglycans were synthesized by the Maillard reaction conjugating lactose (Lac), galacto-oligosaccharides (GOS) or chitin oligosaccharides (Ochit) to porcine serum albumin (PSA). Neoglycans were characterized by SDS-PAGE, intrinsic tryptophan fluorescence and recognition by plant lectins, as well as by F4 ETEC variants...
December 5, 2017: Acta Biochimica Polonica
https://www.readbyqxmd.com/read/29201148/whole-genome-sequencing-based-detection-of-antimicrobial-resistance-and-virulence-in-non-typhoidal-salmonella-enterica-isolated-from-wildlife
#16
Milton Thomas, Gavin John Fenske, Linto Antony, Sudeep Ghimire, Ronald Welsh, Akhilesh Ramachandran, Joy Scaria
The aim of this study was to generate a reference set of Salmonella enterica genomes isolated from wildlife from the United States and to determine the antimicrobial resistance and virulence gene profile of the isolates from the genome sequence data. We sequenced the whole genomes of 103 Salmonella isolates sampled between 1988 and 2003 from wildlife and exotic pet cases that were submitted to the Oklahoma Animal Disease Diagnostic Laboratory, Stillwater, Oklahoma. Among 103 isolates, 50.48% were from wild birds, 0...
2017: Gut Pathogens
https://www.readbyqxmd.com/read/29197951/epibiont-growth-on-filamentous-bacteria-found-in-activated-sludge-a-morphological-approach
#17
Thobela Conco, Sheena Kumari, Thor Stenström, Faizal Bux
Occurrence of epibiont attachment on filamentous bacteria is a common phenomenon in activated sludge. In this study, an attempt has been made to elucidate the intrinsic nature of the attachment between the epibionts and filamentous bacteria based on microscopic observations. Characterization of the epiflora based on fluorescence in situ hybridization using group level probes revealed that the epibionts colonizing these filamentous bacteria largely belongs to the class Alphaproteobacteria, followed by Beta and Gammaproteobacteria...
December 2, 2017: Archives of Microbiology
https://www.readbyqxmd.com/read/29197096/observations-on-the-origin-of-ovarian-cortical-inclusion-cysts-in-women-undergoing-risk-reducing-salpingo-oophorectomy
#18
Kay J Park, Prusha Patel, Irina Linkov, Anjali Jotwani, Noah Kauff, Malcolm C Pike
AIMS: Evidence suggests that up to 70% of high-grade serous ovarian carcinomas (HGSCs) potentially arise from fallopian tube fimbriae, and that many of the remaining cases arise from within the ovary in cortical inclusion cysts (CICs) with a Müllerian phenotype (Müllerian-CICs). It has been proposed that Müllerian-CICs arise either from metaplasia of mesothelial ovarian surface epithelium (OSE) entrapped within the ovary after ovulation, or from normal tubal cells entrapped post-ovulation...
December 2, 2017: Histopathology
https://www.readbyqxmd.com/read/29190705/arthritic-role-of-porphyromonas-gingivalis-in-collagen-induced-arthritis-mice
#19
Hyerin Jung, Seung Min Jung, Yeri Alice Rim, Narae Park, Yoojun Nam, Jennifer Lee, Sung-Hwan Park, Ji Hyeon Ju
Epidemiological studies show an association between rheumatoid arthritis (RA) and periodontal disease. Porphyromonas gingivalis (P.gingivalis) is a well-known pathogen in periodontitis. This study investigated the pathogenic effects of P.gingivalis on autoimmune arthritis in vivo. Collagen-induced arthritis (CIA) mice were intraperitoneally injected with W83 and 2561 strains of P.gingivalis. Infection with P.gingivalis exacerbated arthritis score in CIA mice. Synovial inflammation and bone destruction in CIA mice infected with P...
2017: PloS One
https://www.readbyqxmd.com/read/29188653/-research-progress-on-the-type-%C3%A2-secretion-system-of-porphyromonas-gingivalis
#20
Zhang Jinmei, Zhao Lei, Wu Yafei
In recent years, the study found that Porphyromonas gingivalis type Ⅸ secretion system (T9SS) is a novel protein secretion system, also known as Por secretion system (PorSS). Unlike the eight protein secretion systems found in the past, the system is a polyprotein complex found only in Bacteroides. The secreted proteins have both N- and C-terminus, where the former includes Sec-dependent type Ⅰ signals peptide, and the latter contains conserved domains (C-terminal conserved domain, CTD). Porphyromonas gingivalis T9SS includes proteins such as intima, outer membrane, cytoplasm, and cell cycle, including at least 34 proteins containing CTD...
October 1, 2017: Hua Xi Kou Qiang Yi Xue za Zhi, Huaxi Kouqiang Yixue Zazhi, West China Journal of Stomatology
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