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Infections in compromised host

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https://www.readbyqxmd.com/read/28301312/identification-of-two-meloidogyne-hapla-genes-and-an-investigation-of-their-roles-in-the-plant-nematode-interaction
#1
Cynthia Gleason, Frederik Polzin, Samer S Habash, Lei Zhang, Jan Utermark, Florian M W Grundler, Abdelnaser Elashry
Root-knot nematodes are soil-borne pathogens that invade and establish feeding sites in plant roots. They have an extremely broad host range, including most vascular plants. During infection of a susceptible host, root-knot nematodes secrete molecules called effectors that help them establish an intimate interaction with the plant and, at the same time, allow them to evade or suppress plant immune responses. Despite the fact that Meloidogyne hapla is a significant pest on several food crops, no effectors have been characterized from this root-knot nematode species thus far...
February 2017: Molecular Plant-microbe Interactions: MPMI
https://www.readbyqxmd.com/read/28293397/in-vitro-lymphoproliferative-response-and-cytokine-production-in-mice-with-experimental-disseminated-candidiasis
#2
Ali Reza Khosravi, Hojjatollah Shokri, Shahin Eshghi
OBJECTIVES: Systemic candidiasis is an infection of Candida albicans (C. albicans) causing disseminated disease and sepsis, invariably when host defenses are compromised. We investigated the histopathological changes as well as the lymphoproliferative responses and cytokine production of splenic cells after stimulation with Concanavalin A (Con A) and Pokeweed mitogen (PWM) in mice with disseminated candidiasis. MATERIALS AND METHODS: Lymphoproliferative responses were stimulated in vitro with Con A (1 µg/ml) and PWM (1 µg/ml) mitogens in Roswell Park Memorial Institute (RPMI) 1640 media, and the production of interferon (IFN)-γ and interleukin-4 (IL-4) in the supernatants was measured by enzyme-linked immunosorbent assay (ELISA)...
February 2017: Iranian Journal of Basic Medical Sciences
https://www.readbyqxmd.com/read/28292546/novel-insights-into-host-responses-and-reproductive-pathophysiology-of-porcine-reproductive-and-respiratory-syndrome-caused-by-prrsv-2
#3
REVIEW
John C S Harding, Andrea Ladinig, Predrag Novakovic, Susan E Detmer, Jamie M Wilkinson, Tianfu Yang, Joan K Lunney, Graham S Plastow
A large challenge experiment using North American porcine reproductive and respiratory virus (PRRSV-2) provided new insights into the pathophysiology of reproductive PRRS. Deep phenotyping of dams and fetuses identified maternal and fetal predictors of PRRS severity and resilience. PRRSV infection resulted in dramatic decreases in all leukocyte subsets by 2days post inoculation. Apoptosis in the interface region was positively related to endometrial vasculitis, viral load in endometrium and fetal thymus, and odds of meconium staining...
March 2, 2017: Veterinary Microbiology
https://www.readbyqxmd.com/read/28291780/removing-the-needle-from-the-haystack-enrichment-of-wolbachia-endosymbiont-transcripts-from-host-nematode-rna-by-cappable-seq%C3%A2
#4
Ashley N Luck, Barton E Slatko, Jeremy M Foster
Efficient transcriptomic sequencing of microbial mRNA derived from host-microbe associations is often compromised by the much lower relative abundance of microbial RNA in the mixed total RNA sample. One solution to this problem is to perform extensive sequencing until an acceptable level of transcriptome coverage is obtained. More cost-effective methods include use of prokaryotic and/or eukaryotic rRNA depletion strategies, sometimes in conjunction with depletion of polyadenylated eukaryotic mRNA. Here, we report use of Cappable-seq™ to specifically enrich, in a single step, Wolbachia endobacterial mRNA transcripts from total RNA prepared from the parasitic filarial nematode, Brugia malayi...
2017: PloS One
https://www.readbyqxmd.com/read/28289428/inflammation-dna-damage-helicobacter-pylori-and-gastric-tumorigenesis
#5
REVIEW
Polyxeni Kalisperati, Evangelia Spanou, Ioannis S Pateras, Penelope Korkolopoulou, Anastasia Varvarigou, Ioannis Karavokyros, Vassilis G Gorgoulis, Panayiotis G Vlachoyiannopoulos, Stavros Sougioultzis
Helicobacter pylori (H. pylori) is a Gram negative bacterium that colonizes the stomach of almost half human population. It has evolved to escape immune surveillance, establishes lifelong inflammation, predisposing to genomic instability and DNA damage, notably double strand breaks. The epithelial host cell responds by activation of DNA damage repair (DDR) machinery that seems to be compromised by the infection. It is therefore now accepted that genetic damage is a major mechanism operating in cases of H. pylori induced carcinogenesis...
2017: Frontiers in Genetics
https://www.readbyqxmd.com/read/28279803/japanese-encephalitis-virus-disrupts-blood-brain-barrier-and-modulates-apoptosis-proteins-in-thbmec-cells
#6
Mazen M Jamil Al-Obaidi, Azadeh Bahadoran, Lee Sau Har, Wang Seok Mui, Jayakumar Rajarajeswaran, Keivan Zandi, Rishya Manikam, Shamala Devi Sekaran
Japanese encephalitis (JE) is a neurotropic flavivirus that causes inflammation in central nervous system (CNS), neuronal death and also compromises the structural and functional integrity of the blood-brain barrier (BBB). The aim of this study was to evaluate the BBB disruption and apoptotic process in Japanese encephalitis virus (JEV)-infected transfected human brain microvascular endothelial cells (THBMECs). THBMECs were overlaid by JEV with different MOIs (0.5, 1.0, 5.0 and 10.0) and monitored by electrical cell-substrate impedance sensing (ECIS) in a real-time manner in order to observe the barrier function of THBMECs...
March 6, 2017: Virus Research
https://www.readbyqxmd.com/read/28275140/antibody-independent-function-of-human-b-cells-contributes-to-antifungal-t-cell-responses
#7
Rui Li, Ayman Rezk, Hulun Li, Jennifer L Gommerman, Alexandre Prat, Amit Bar-Or
Fungal infections (e.g., Candida albicans) can manifest as serious medical illnesses, especially in the elderly and immune-compromised hosts. T cells are important for Candida control. Whether and how B cells are involved in antifungal immunity has been less clear. Although patients with agammaglobulinemia exhibit normal antifungal immunity, increased fungal infections are reported following B cell-depleting therapy, together pointing to Ab-independent roles of B cells in controlling such infections. To test how human B cells may contribute to fungal-associated human T cell responses, we developed a novel Ag-specific human T cell/B cell in vitro coculture system and found that human B cells could induce C...
March 8, 2017: Journal of Immunology: Official Journal of the American Association of Immunologists
https://www.readbyqxmd.com/read/28261252/rna-interference-rnai-as-a-potential-tool-for-control-of-mycotoxin-contamination-in-crop-plants-concepts-and-considerations
#8
REVIEW
Rajtilak Majumdar, Kanniah Rajasekaran, Jeffrey W Cary
Mycotoxin contamination in food and feed crops is a major concern worldwide. Fungal pathogens of the genera Aspergillus. Fusarium, and Penicillium are a major threat to food and feed crops due to production of mycotoxins such as aflatoxins, 4-deoxynivalenol, patulin, and numerous other toxic secondary metabolites that substantially reduce the value of the crop. While host resistance genes are frequently used to introgress disease resistance into elite germplasm, either through traditional breeding or transgenic approaches, such resistance is often compromised by the evolving pathogen over time...
2017: Frontiers in Plant Science
https://www.readbyqxmd.com/read/28239912/verrucae-planae-within-previous-xenograft-sites-of-burn-wounds
#9
Olivia Chen, Michelle Vernali Pearlstein, Dean S Morrell, Sarah B Corley
Burn injuries are known to compromise host immune defenses through disruption of mucocutaneous barriers and suppression of cell-mediated immune responses, which may render patients with burn injuries susceptible to viral infections in the days to years after an initial insult. We report a case of verrucae planae developing as a secondary condition confined to former xenograft sites in a child, appearing more than 3.5 years after initial second-degree burn injuries. Only a few reports have previously described the development of verrucae in former burn sites, with most reporting latency to onset of verrucae appearance of months rather than years...
February 27, 2017: Pediatric Dermatology
https://www.readbyqxmd.com/read/28231023/increasing-nocardia-incidence-associated-with-bronchiectasis-at-a-tertiary-care-center
#10
Michael H Woodworth, Jennifer L Saullo, Paul M Lantos, Gary M Cox, Jason E Stout
RATIONALE: Nocardia is a genus of pathogens that most commonly afflict immunocompromised hosts but may be an emerging infection among persons with bronchiectasis. OBJECTIVES: To examine the epidemiology and clinical presentation of adult patients with Nocardia and bronchiectasis relative to other patient groups. METHODS: We examined a retrospectively assembled cohort of adults at Duke University Hospital in Durham, North Carolina with at least one positive culture from a bodily fluid or tissue specimen for Nocardia between January 1996 and December 2013...
March 2017: Annals of the American Thoracic Society
https://www.readbyqxmd.com/read/28223256/role-of-the-leukocyte-response-in-normal-and-immunocompromised-host-after-clostridium-difficile-infection
#11
Edwin Vargas, Senu Apewokin, Rajat Madan
Clostridium difficile is the leading cause of healthcare-associated infections in the United States. Clinically, C. difficile-associated disease can present as asymptomatic colonization, self-limited diarrheal illness or severe colitis (that may result in death). This variability in disease course and outcomes suggests that host factors play an important role as key determinants of disease severity. Currently, there are several scoring indices to estimate severity of C. difficile-associated disease. Leukocytosis and renal failure are considered to be the most important predictors of C...
February 20, 2017: Anaerobe
https://www.readbyqxmd.com/read/28192515/salmonella-typhimurium-disrupts-sirt1-ampk-checkpoint-control-of-mtor-to-impair-autophagy
#12
Raja Ganesan, Nina Judith Hos, Saray Gutierrez, Julia Fischer, Joanna Magdalena Stepek, Evmorphia Daglidu, Martin Krönke, Nirmal Robinson
During intracellular infections, autophagy significantly contributes to the elimination of pathogens, regulation of pro-inflammatory signaling, secretion of immune mediators and in coordinating the adaptive immune system. Intracellular pathogens such as S. Typhimurium have evolved mechanisms to circumvent autophagy. However, the regulatory mechanisms targeted by S. Typhimurium to modulate autophagy have not been fully resolved. Here we report that cytosolic energy loss during S. Typhimurium infection triggers transient activation of AMPK, an important checkpoint of mTOR activity and autophagy...
February 2017: PLoS Pathogens
https://www.readbyqxmd.com/read/28183327/characteristics-of-sirnas-derived-from-southern-rice-black-streaked-dwarf-virus-in-infected-rice-and-their-potential-role-in-host-gene-regulation
#13
Donglin Xu, Guohui Zhou
BACKGROUND: Virus-derived siRNAs (vsiRNAs)-mediated RNA silencing plays important roles in interaction between plant viruses and their hosts. Southern rice black-streaked dwarf virus (SRBSDV) is a newly emerged devastating rice reovirus with ten dsRNA genomic segments. The characteristics of SRBSDV-derived siRNAs and their biological implications in SRBSDV-rice interaction remain unexplored. METHODS: VsiRNAs profiling from SRBSDV-infected rice samples was done via small RNA deep sequencing...
February 10, 2017: Virology Journal
https://www.readbyqxmd.com/read/28167698/adar1-and-pact-contribute-to-efficient-translation-of-transcripts-containing-hiv-1-trans-activating-response-tar-element
#14
Evelyn Chukwurah, Indhira Handy, Rekha C Patel
Human immunodeficiency virus type 1 (HIV-1) has evolved various measures to counter the host cell's innate antiviral response during the course of infection. Interferon (IFN)-stimulated gene products are produced following HIV-1 infection to limit viral replication, but viral proteins and RNAs counteract their effect. One such mechanism is specifically directed against the IFN-induced Protein Kinase R (PKR), which is centrally important to the cellular antiviral response. In the presence of viral RNAs, PKR is activated and phosphorylates the translation initiation factor, eIF2α...
February 6, 2017: Biochemical Journal
https://www.readbyqxmd.com/read/28161350/triggered-urine-interleukin-6-correlates-to-severity-of-symptoms-in-non-febrile-lower-urinary-tract-infections
#15
Fredrik Sundén, Daniel Butler, Björn Wullt
PURPOSE: Objective diagnosis of symptomatic urinary tract infections (UTI) in patients prone to asymptomatic bacteriuria (ABU) is compromised by the already present local host responses and the positive urine culture. We investigated Interleukin-6 (IL-6) as a biomarker for non-febrile UTI severity, and diagnostic thresholds for IL-6, IL8 and neutrophils in differentiating between ABU and UTI. METHODS: Patients with residual urine and neurogenic bladders due to spinal lesions included in a long term E...
February 1, 2017: Journal of Urology
https://www.readbyqxmd.com/read/28158306/identification-of-cyst-nematode-b-type-cle-peptides-and-modulation-of-the-vascular-stem-cell-pathway-for-feeding-cell-formation
#16
Xiaoli Guo, Jianying Wang, Michael Gardner, Hiroo Fukuda, Yuki Kondo, J Peter Etchells, Xiaohong Wang, Melissa Goellner Mitchum
Stem cell pools in the SAM (shoot apical meristem), RAM (root apical meristem) and vascular procambium/cambium are regulated by CLE-receptor kinase-WOX signaling modules. Previous data showed that cyst nematode CLE-like effector proteins delivered into host cells through a stylet, act as ligand mimics of plant A-type CLE peptides and are pivotal for successful parasitism. Here we report the identification of a new class of CLE peptides from cyst nematodes with functional similarity to the B-type CLE peptide TDIF (tracheary element differentiation inhibitory factor) encoded by the CLE41 and CLE44 genes in Arabidopsis...
February 2017: PLoS Pathogens
https://www.readbyqxmd.com/read/28144629/pho4-is-essential-for-dissemination-of-cryptococcus-neoformans-to-the-host-brain-by-promoting-phosphate-uptake-and-growth-at-alkaline-ph
#17
Sophie Lev, Keren Kaufman-Francis, Desmarini Desmarini, Pierre G Juillard, Cecilia Li, Sebastian A Stifter, Carl G Feng, Tania C Sorrell, Georges E R Grau, Yong-Sun Bahn, Julianne T Djordjevic
Phosphate acquisition by fungi is regulated by the phosphate-sensing and acquisition (PHO) signaling pathway. Cryptococcus neoformans disseminates from the lung to the brain and is the commonest cause of fungal meningitis worldwide. To investigate the contribution of PHO signaling to cryptococcal dissemination, we characterized a transcription factor knockout strain (hlh3Δ/pho4Δ) defective in phosphate acquisition. Despite little similarity with other fungal Pho4 proteins, Hlh3/Pho4 functioned like a typical phosphate-responsive transcription factor in phosphate-deprived cryptococci, accumulating in nuclei and triggering expression of genes involved in phosphate acquisition...
January 2017: MSphere
https://www.readbyqxmd.com/read/28130016/cortical-strut-allograft-support-of-modular-femoral-junctions-during-revision-total-hip-arthroplasty
#18
Chin Tat Lim, Derek F Amanatullah, James I Huddleston, Katherine L Hwang, William J Maloney, Stuart B Goodman
BACKGROUND: There is risk of junction failure when using modular femoral stems for revision total hip arthroplasty (THA), especially with loss of bone stock in the proximal femur. Using a cortical strut allograft may provide additional support of a modular femoral construct in revision THA. METHODS: We reviewed prospectively gathered clinical and radiographic data for 28 revision THAs performed from 2004 to 2014 using cementless modular femoral components with cortical strut allograft applied to supplement proximal femoral bone loss: 5 (18%) were fluted taper designs and 23 (82%) were porous cylindrical designs All the patients had a Paprosky grade IIIA or greater femoral defect...
December 21, 2016: Journal of Arthroplasty
https://www.readbyqxmd.com/read/28129542/pathogen-mediated-inhibition-of-anorexia-promotes-host-survival-and-transmission
#19
Sheila Rao, Alexandria M Palaferri Schieber, Carolyn P O'Connor, Mathias Leblanc, Daniela Michel, Janelle S Ayres
Sickness-induced anorexia is a conserved behavior induced during infections. Here, we report that an intestinal pathogen, Salmonella Typhimurium, inhibits anorexia by manipulating the gut-brain axis. Inhibition of inflammasome activation by the S. Typhimurium effector, SlrP, prevented anorexia caused by IL-1β-mediated signaling to the hypothalamus via the vagus nerve. Rather than compromising host defenses, pathogen-mediated inhibition of anorexia increased host survival. SlrP-mediated inhibition of anorexia prevented invasion and systemic infection by wild-type S...
January 26, 2017: Cell
https://www.readbyqxmd.com/read/28115333/clinical-efficacy-of-%C3%AE-lactam-%C3%AE-lactamase-inhibitor-combinations-for-the-treatment-of-bloodstream-infection-due-to-extended-spectrum-%C3%AE-lactamase-producing-enterobacteriaceae-in-haematological-patients-with-neutropaenia-a-study-protocol-for-a-retrospective-observational
#20
C Gudiol, C Royo-Cebrecos, C Tebe, E Abdala, M Akova, R Álvarez, G Maestro-de la Calle, A Cano, C Cervera, W T Clemente, P Martín-Dávila, A Freifeld, L Gómez, T Gottlieb, M Gurguí, F Herrera, A Manzur, G Maschmeyer, Y Meije, M Montejo, M Peghin, J Rodríguez-Baño, I Ruiz-Camps, T C Sukiennik, J Carratalà
INTRODUCTION: Bloodstream infection (BSI) due to extended-spectrum β-lactamase-producing Gram-negative bacilli (ESBL-GNB) is increasing at an alarming pace worldwide. Although β-lactam/β-lactamase inhibitor (BLBLI) combinations have been suggested as an alternative to carbapenems for the treatment of BSI due to these resistant organisms in the general population, their usefulness for the treatment of BSI due to ESBL-GNB in haematological patients with neutropaenia is yet to be elucidated...
January 23, 2017: BMJ Open
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