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Frontiers in Cellular and Infection Microbiology

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https://www.readbyqxmd.com/read/28224119/vesicular-stomatitis-virus-vectored-multi-antigen-tuberculosis-vaccine-limits-bacterial-proliferation-in-mice-following-a-single-intranasal-dose
#1
Ming Zhang, Chunsheng Dong, Sidong Xiong
Tuberculosis (TB) remains a serious health problem worldwide, and an urgent need exists to improve or replace the available vaccine, Mycobacterium bovis bacillus Calmette-Guérin (BCG). Most vaccination protocols adapt two or three doses to induce long-term lasting immunity. Our previous study showed that the naked DNA encoding the triple-antigen fusion TFP846 (Rv3615c-Mtb10.4-Rv2660c) induced robust T cellular immune responses accompanying four inoculations against mycobacteria infection. However, a number of compliance issues exist in some areas lacking the appropriate medical infrastructure with multiple administrations...
2017: Frontiers in Cellular and Infection Microbiology
https://www.readbyqxmd.com/read/28224118/heparin-binding-hemagglutinin-of-mycobacterium-tuberculosis-is-an-inhibitor-of-autophagy
#2
Qing Zheng, Zhi Li, Shan Zhou, Qian Zhang, Lei Zhou, Xiaorui Fu, Liu Yang, Yueyun Ma, Xiaoke Hao
Airway epithelial cell is often the initial site of attack by pathogens, and cell death is commonly caused by internalization of Mycobacterium tuberculosis (Mtb). However, the mechanism of interaction between epithelial cells and Mtb is not well understood. In this study, we investigated the role of the heparin-binding hemagglutinin (HBHA) protein of Mtb in the function of epithelial cells. In particular, the autophagy of A549 cells was determined based on microtubule-associated protein 1 light chain 3 alpha (LC3) activity...
2017: Frontiers in Cellular and Infection Microbiology
https://www.readbyqxmd.com/read/28224117/perc-manipulates-metabolism-and-surface-antigens-in-enteropathogenic-escherichia-coli
#3
Jay L Mellies, Amy Platenkamp, Jossef Osborn, Lily Ben-Avi
Enteropathogenic Escherichia coli is an important cause of profuse, watery diarrhea in infants living in developing regions of the world. Typical strains of EPEC (tEPEC) possess a virulence plasmid, while related clinical isolates that lack the pEAF plasmid are termed atypical EPEC (aEPEC). tEPEC and aEPEC tend to cause acute vs. more chronic type infections, respectively. The pEAF plasmid encodes an attachment factor as well as a regulatory operon, perABC. PerC, a poorly understood regulator, was previously shown to regulate expression of the type III secretion system through Ler...
2017: Frontiers in Cellular and Infection Microbiology
https://www.readbyqxmd.com/read/28224116/persistence-of-functional-protein-domains-in-mycoplasma-species-and-their-role-in-host-specificity-and-synthetic-minimal-life
#4
Tjerko Kamminga, Jasper J Koehorst, Paul Vermeij, Simen-Jan Slagman, Vitor A P Martins Dos Santos, Jetta J E Bijlsma, Peter J Schaap
Mycoplasmas are the smallest self-replicating organisms and obligate parasites of a specific vertebrate host. An in-depth analysis of the functional capabilities of mycoplasma species is fundamental to understand how some of simplest forms of life on Earth succeeded in subverting complex hosts with highly sophisticated immune systems. In this study we present a genome-scale comparison, focused on identification of functional protein domains, of 80 publically available mycoplasma genomes which were consistently re-annotated using a standardized annotation pipeline embedded in a semantic framework to keep track of the data provenance...
2017: Frontiers in Cellular and Infection Microbiology
https://www.readbyqxmd.com/read/28224115/the-escherichia-coli-serogroup-o1-and-o2-lipopolysaccharides-are-encoded-by-multiple-o-antigen-gene-clusters
#5
Sabine Delannoy, Lothar Beutin, Patricia Mariani-Kurkdjian, Aubin Fleiss, Stéphane Bonacorsi, Patrick Fach
Escherichia coli strains belonging to serogroups O1 and O2 are frequently associated with human infections, especially extra-intestinal infections such as bloodstream infections or urinary tract infections. These strains can be associated with a large array of flagellar antigens. Because of their frequency and clinical importance, a reliable detection of E. coli O1 and O2 strains and also the frequently associated K1 capsule is important for diagnosis and source attribution of E. coli infections in humans and animals...
2017: Frontiers in Cellular and Infection Microbiology
https://www.readbyqxmd.com/read/28224114/ha-triggers-the-switch-from-mek1-sumoylation-to-phosphorylation-of-the-erk-pathway-in-influenza-a-virus-infected-cells-and-facilitates-its-infection
#6
Chengmin Wang, Huimin Liu, Jing Luo, Lin Chen, Meng Li, Wen Su, Na Zhao, Shelan Liu, Li Xie, Yaxiong Jia, Hua Ding, Xiufeng Wan, Hongxuan He
Several post-translational modifications in host cells are hijacked by pathogens to facilitate their propagation. A number of components of the influenza virus have been reported to be modified by small ubiquitin-like modifier (SUMO) proteins during infection. We hypothesized that the MAPK/ERK pathway could be modified by SUMO1 because the SUMOylation of MEK1 was quickly eliminated after influenza A virus infection. We identified host cell MEK1 as a target of SUMO1 through LC/MS/MS, and enhanced MEK1 SUMOylation inhibited the infection of the virus, while inhibition of host cell MEK1 SUMOylation facilitated virus propagation...
2017: Frontiers in Cellular and Infection Microbiology
https://www.readbyqxmd.com/read/28220142/absence-of-an-n-linked-glycosylation-motif-in-the-glycoprotein-of-the-live-attenuated-argentine-hemorrhagic-fever-vaccine-candid-1-results-in-its-improper-processing-and-reduced-surface-expression
#7
John T Manning, Alexey V Seregin, Nadezhda E Yun, Takaaki Koma, Cheng Huang, José Barral, Juan C de la Torre, Slobodan Paessler
Junin virus (JUNV), a highly pathogenic New World arenavirus, is the causative agent of Argentine hemorrhagic fever (AHF). The live-attenuated Candid #1 (Can) strain currently serves as a vaccine for at-risk populations. We have previously shown that the Can glycoprotein (GPC) gene is the primary gene responsible for attenuation in a guinea pig model of AHF. However, the mechanisms through which the GPC contributes to the attenuation of the Can strain remain unknown. A more complete understanding of the mechanisms underlying the attenuation and immunogenicity of the Can strain will potentially allow for the rational design of additional safe and novel vaccines...
2017: Frontiers in Cellular and Infection Microbiology
https://www.readbyqxmd.com/read/28217559/a-novel-enterovirus-71-ev71-virulence-determinant-the-69th-residue-of-3c-protease-modulates-pathogenicity
#8
Bingqing Li, Yingying Yue, Yajie Zhang, Zenglin Yuan, Peng Li, Nannan Song, Wei Lin, Yan Liu, Lichuan Gu, Hong Meng
Human enterovirus type 71 (EV71), the major causative agent of hand-foot-and-mouth disease, has been known to cause fatal neurological complications. Unfortunately, the reason for neurological complications that have been seen in fatal cases of the disease and the relationship between EV71 virulence and viral genetic sequences remains largely undefined. The 3C protease (3C(pro)) of EV71 plays an irreplaceable role in segmenting the precursor polyprotein during viral replication, and intervening with host life activity during viral infection...
2017: Frontiers in Cellular and Infection Microbiology
https://www.readbyqxmd.com/read/28217558/the-scid-mouse-model-for-identifying-virulence-determinants-in-coxiella-burnetii
#9
Erin J van Schaik, Elizabeth D Case, Eric Martinez, Matteo Bonazzi, James E Samuel
Coxiella burnetii is an intracellular, zoonotic pathogen that is the causative agent of Q fever. Infection most frequently occurs after inhalation of contaminated aerosols, which can lead to acute, self-limiting febrile illness or more serve chronic infections such as hepatitis or endocarditis. Macrophages are the principal target cells during infection where C. burnetii resides and replicates within a unique phagolysosome-like compartment, the Coxiella-containing vacuole (CCV). The first virulence determinant described as necessary for infection was full-length lipopolysaccarride (LPS); spontaneous rough mutants (phase II) arise after passage in immuno-incompetent hosts...
2017: Frontiers in Cellular and Infection Microbiology
https://www.readbyqxmd.com/read/28217557/regulation-of-antimicrobial-peptides-in-aedes-aegypti-aag2-cells
#10
Rudian Zhang, Yibin Zhu, Xiaojing Pang, Xiaoping Xiao, Renli Zhang, Gong Cheng
Antimicrobial peptides (AMPs) are an important group of immune effectors that play a role in combating microbial infections in invertebrates. Most of the current information on the regulation of insect AMPs in microbial infection have been gained from Drosophila, and their regulation in other insects are still not completely understood. Here, we generated an AMP induction profile in response to infections with some Gram-negative, -positive bacteria, and fungi in Aedes aegypti embryonic Aag2 cells. Most of the AMP inductions caused by the gram-negative bacteria was controlled by the Immune deficiency (Imd) pathway; nonetheless, Gambicin, an AMP gene discovered only in mosquitoes, was combinatorially regulated by the Imd, Toll and JAK-STAT pathways in the Aag2 cells...
2017: Frontiers in Cellular and Infection Microbiology
https://www.readbyqxmd.com/read/28217556/group-b-streptococcus-induces-neutrophil-recruitment-to-gestational-tissues-and-elaboration-of-extracellular-traps-and-nutritional-immunity
#11
Vishesh Kothary, Ryan S Doster, Lisa M Rogers, Leslie A Kirk, Kelli L Boyd, Joann Romano-Keeler, Kathryn P Haley, Shannon D Manning, David M Aronoff, Jennifer A Gaddy
Streptococcus agalactiae, or Group B Streptococcus (GBS), is a gram-positive bacterial pathogen associated with infection during pregnancy and is a major cause of morbidity and mortality in neonates. Infection of the extraplacental membranes surrounding the developing fetus, a condition known as chorioamnionitis, is characterized histopathologically by profound infiltration of polymorphonuclear cells (PMNs, neutrophils) and greatly increases the risk for preterm labor, stillbirth, or neonatal GBS infection...
2017: Frontiers in Cellular and Infection Microbiology
https://www.readbyqxmd.com/read/28217555/comparison-of-murine-cervicovaginal-infection-by-chlamydial-strains-identification-of-extrusions-shed-in-vivo
#12
Jennifer H Shaw, Amanda R Behar, Timothy A Snider, Noah A Allen, Erika I Lutter
Chlamydia trachomatis is the leading cause of bacterial sexually transmitted infections (STIs) and preventable blindness. Untreated, asymptomatic infection as well as frequent re-infection are common and may drive pelvic inflammatory disease, ectopic pregnancy, and infertility. In vivo models of chlamydial infection continue to be instrumental in progress toward a vaccine and further elucidating the pathogenesis of this intracellular bacterium, however significant gaps in our understanding remain. Chlamydial host cell exit occurs via two mechanisms, lysis and extrusion, although the latter has yet to be reported in vivo and its biological role is unclear...
2017: Frontiers in Cellular and Infection Microbiology
https://www.readbyqxmd.com/read/28203549/microbiological-and-clinical-characteristics-of-hypermucoviscous-klebsiella-pneumoniae-isolates-associated-with-invasive-infections-in-china
#13
Yinjuan Guo, Shanshan Wang, Lingling Zhan, Ye Jin, Jingjing Duan, Zhihao Hao, Jingnan Lv, Xiuqin Qi, Liang Chen, Barry N Kreiswirth, Liangxing Wang, Fangyou Yu
A distinctive syndrome caused by hypermucoviscous Klebsiella pneumoniae (HMKP) including pyogenic liver abscess (PLA) is now becoming a globally emerging disease. In the present study, 22.8% (84/369) of K. pneumoniae clinical isolates associated with various types of invasive infections were identified as HMKP, with 45.2% associated with PLA. Multivariate regression analysis showed that male patients with 41-50 years, PLA, diabetes mellitus, and hypertension were independent risk factors for HMKP infections...
2017: Frontiers in Cellular and Infection Microbiology
https://www.readbyqxmd.com/read/28203548/doxycycline-induces-mitophagy-and-suppresses-production-of-interferon-%C3%AE-in-ipec-j2-cells
#14
Yang Xing, Zhu Liqi, Lin Jian, Yu Qinghua, Yang Qian
Previous reports have demonstrated that the second-generation tetracycline derivative doxycycline (DOX) interrupts mitochondrial proteostasis and physiology, inhibits proliferation of many cell types, and induces apoptosis. However, the effects of DOX, which is widely used in porcine husbandry by feed, on the porcine intestinal epithelium are unclear. In this study, we demonstrated that DOX damaged mitochondrial morphology and induced the co-localization of mitochondria with autophagosomes, suggesting that DOX induces mitophagy in IPEC-J2 cells...
2017: Frontiers in Cellular and Infection Microbiology
https://www.readbyqxmd.com/read/28194372/mir-34b-5p-suppresses-melanoma-differentiation-associated-gene-5-mda5-signaling-pathway-to-promote-avian-leukosis-virus-subgroup-j-alv-j-infected-cells-proliferaction-and-alv-j-replication
#15
Zhenhui Li, Qingbin Luo, Haiping Xu, Ming Zheng, Bahareldin Ali Abdalla, Min Feng, Bolin Cai, Xiaocui Zhang, Qinghua Nie, Xiquan Zhang
Avian leukosis virus subgroup J (ALV-J) is an oncogenic retrovirus that has a similar replication cycle to multiple viruses and therefore can be used as a model system for viral entry into host cells. However, there are few reports on the genes or microRNAs (miRNAs) that are responsible for the replication of ALV-J. Our previous miRNA and RNA sequencing data showed that the expression of miR-34b-5p was significantly upregulated in ALV-J-infected chicken spleens compared to non-infected chicken spleens, but melanoma differentiation-associated gene 5 (MDA5) had the opposite expression pattern...
2017: Frontiers in Cellular and Infection Microbiology
https://www.readbyqxmd.com/read/28194371/non-tuberculous-mycobacteria-in-south-african-wildlife-neglected-pathogens-and-potential-impediments-for-bovine-tuberculosis-diagnosis
#16
Nomakorinte Gcebe, Tiny M Hlokwe
Non-tuberculous mycobacteria (NTM) are not only emerging and opportunistic pathogens of both humans and animals, but from a veterinary point of view some species induce cross-reactive immune responses that hamper the diagnosis of bovine tuberculosis (bTB) in both livestock and wildlife. Little information is available about NTM species circulating in wildlife species of South Africa. In this study, we determined the diversity of NTM isolated from wildlife species from South Africa as well as Botswana. Thirty known NTM species and subspecies, as well as unidentified NTM, and NTM closely related to Mycobacterium goodii/Mycobacterium smegmatis were identified from 102 isolates cultured between the years 1998 and 2010, using a combination of molecular assays viz PCR and sequencing of different Mycobacterial house-keeping genes as well as single nucleotide polymorphism (SNP) analysis...
2017: Frontiers in Cellular and Infection Microbiology
https://www.readbyqxmd.com/read/28184355/spiroplasma-eriocheiris-adhesin-like-protein-alp-interacts-with-epidermal-growth-factor-egf-domain-proteins-to-facilitate-infection
#17
Libo Hou, Yuhan Liu, Qi Gao, Xuechuan Xu, Mingxiao Ning, Jingxiu Bi, Hui Liu, Min Liu, Wei Gu, Wen Wang, Qingguo Meng
Spiroplasma eriocheiris is a novel pathogen found in recent years, causing the tremor disease (TD) of Chinese mitten crab Eriocheir sinensis. Like Spiroplasma mirum, S. eriocheiris infects the newborn mouse (adult mice are not infected) and can cause cataract. Adhesion-related protein is an important protein involved in the interaction between pathogen and host. In this study, the Adhesin-like Protein (ALP) of S. eriocheiris was detected on its outer membrane by using immune electron microscopy, and was found to be involved in the bacterium's infection of mouse embryo fibroblasts (3T6-Swiss albino)...
2017: Frontiers in Cellular and Infection Microbiology
https://www.readbyqxmd.com/read/28184354/gallium-protoporphyrin-ix-inhibits-pseudomonas-aeruginosa-growth-by-targeting-cytochromes
#18
Sarah Hijazi, Paolo Visca, Emanuela Frangipani
Pseudomonas aeruginosa is a challenging pathogen due to both innate and acquired resistance to antibiotics. It is capable of causing a variety of infections, including chronic lung infection in cystic fibrosis (CF) patients. Given the importance of iron in bacterial physiology and pathogenicity, iron-uptake and metabolism have become attractive targets for the development of new antibacterial compounds. P. aeruginosa can acquire iron from a variety of sources to fulfill its nutritional requirements both in the environment and in the infected host...
2017: Frontiers in Cellular and Infection Microbiology
https://www.readbyqxmd.com/read/28180113/the-host-cell-transcription-factor-egr1-is-induced-by-bacteria-through-the-egfr-erk1-2-pathway
#19
Nele de Klerk, Sunil D Saroj, Gabriela M Wassing, Lisa Maudsdotter, Ann-Beth Jonsson
The essential first step in bacterial colonization is adhesion to the host epithelial cells. The early host-responses post-bacterial adhesions are still poorly understood. Early growth response 1 (EGR1) is an early response transcriptional regulator that can be rapidly induced by various environmental stimuli. Several bacteria can induce EGR1 expression in host cells, but the involved bacterial characteristics and the underlying molecular mechanisms of this response are largely unknown. Here, we show that EGR1 can be induced in host epithelial cells by different species of bacteria independent of the adherence level, Gram-staining type and pathogenicity...
2017: Frontiers in Cellular and Infection Microbiology
https://www.readbyqxmd.com/read/28180112/oral-multiple-sclerosis-drugs-inhibit-the-in-vitro-growth-of-epsilon-toxin-producing-gut-bacterium-clostridium-perfringens
#20
Kareem R Rumah, Timothy K Vartanian, Vincent A Fischetti
There are currently three oral medications approved for the treatment of multiple sclerosis (MS). Two of these medications, Fingolimod, and Teriflunomide, are considered to be anti-inflammatory agents, while dimethyl fumarate (DMF) is thought to trigger a robust antioxidant response, protecting vulnerable cells during an MS attack. We previously proposed that epsilon toxin from the gut bacterium, Clostridium perfringens, may initiate newly forming MS lesions due to its tropism for blood-brain barrier (BBB) vasculature and central nervous system myelin...
2017: Frontiers in Cellular and Infection Microbiology
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