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https://www.readbyqxmd.com/read/28331202/immune-evasion-of-borrelia-miyamotoi-cbia-a-novel-outer-surface-protein-exhibiting-complement-binding-and-inactivating-properties
#1
Florian Röttgerding, Alex Wagemakers, Joris Koetsveld, Volker Fingerle, Michael Kirschfink, Joppe W Hovius, Peter F Zipfel, Reinhard Wallich, Peter Kraiczy
Borrelia (B.) miyamotoi, an emerging tick-borne relapsing fever spirochete, resists complement-mediated killing. To decipher the molecular principles of immune evasion, we sought to identify determinants contributing to complement resistance. Employing bioinformatics, we identified a gene encoding for a putative Factor H-binding protein, termed CbiA (complement binding and inhibitory protein A). Functional analyses revealed that CbiA interacted with complement regulator Factor H (FH), C3, C3b, C4b, C5, and C9...
March 22, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28303833/antimicrobial-susceptibility-of-leptospira-spp-isolated-from-environmental-human-and-animal-sources-in-malaysia
#2
Douadi Benacer, Siti Nursheena Mohd Zain, Peck Toung Ooi, Kwai Lin Thong
Leptospirosis is a zoonosis with worldwide distribution caused by pathogenic spirochetes of the genus Leptospira. The aim of this study was to evaluate the susceptibility of isolates obtained from different hosts. A total of 65 Leptospira isolates from humans (n = 1), zoonoses (rat, n = 60; dog, n = 1; swine, n = 1) and environment (n = 2) were tested against six antibiotics. All the isolates were resistant to trimethoprim and sulphamethoxazole and had high MIC toward chloramphenicol (MIC90: 6.25 μg/ml). All except one environment isolate were sensitive to ampicillin, doxycycline and penicillin G...
January 2017: Indian Journal of Medical Microbiology
https://www.readbyqxmd.com/read/28303129/there-is-a-method-to-the-madness-strategies-to-study-host-complement-evasion-by-lyme-disease-and-relapsing-fever-spirochetes
#3
REVIEW
Ashley L Marcinkiewicz, Peter Kraiczy, Yi-Pin Lin
Lyme disease and relapsing fever are caused by various Borrelia species. Lyme disease borreliae, the most common vector-borne pathogens in both the U.S. and Europe, are transmitted by Ixodes ticks and disseminate from the site of tick bites to tissues leading to erythema migrans skin rash, arthritis, carditis, and neuroborreliosis. Relapsing fever borreliae, carried by ticks and lice, trigger reoccurring fever episodes. Following transmission, spirochetes survive in the blood to induce bacteremia at the early stages of infection, which is thought to promote evasion of the host complement system...
2017: Frontiers in Microbiology
https://www.readbyqxmd.com/read/28300642/distribution-and-phylogeny-of-brachyspira-spp-in-human-intestinal-spirochetosis-revealed-by-fish-and-16s-rrna-gene-analysis
#4
Pablo Rojas, Annett Petrich, Julia Schulze, Alexandra Wiessner, Christoph Loddenkemper, Hans-Jörg Epple, William Sterlacci, Michael Vieth, Judith Kikhney, Annette Moter
During six years as National Reference Laboratory for Spirochetes we investigated 149 intestinal biopsies from 91 patients, which were histopathologically diagnosed with human intestinal spirochetosis (HIS), using fluorescence in situ hybridization (FISH) combined with 16S rRNA gene PCR and sequencing. Aim of this study was to complement histopathological findings with FISH and PCR for definite diagnosis and species identification of the causative pathogens. HIS is characterized by colonization of the colonic mucosa of the human distal intestinal tract by Brachyspira spp...
March 11, 2017: Anaerobe
https://www.readbyqxmd.com/read/28296262/the-c-terminal-region-of-the-major-outer-sheath-protein-msp-of-treponema-denticola-inhibits-neutrophil-chemotaxis
#5
Megan M Jones, Stephen T Vanyo, Michelle B Visser
Treponema denticola is an oral spirochete strongly associated with severe periodontal disease. A prominent virulence factor, the major outer sheath protein (Msp), disorients neutrophil chemotaxis by altering the cellular phosphoinositide balance, leading to impairment of downstream chemotactic events including actin rearrangement, Rac1 activation and Akt activation in response to chemoattractant stimulation. The specific regions of Msp responsible for interactions with neutrophils remain unknown. In this study, we investigated the inhibitory effect of truncated Msp regions on neutrophil chemotaxis and associated signaling pathways...
March 13, 2017: Molecular Oral Microbiology
https://www.readbyqxmd.com/read/28294067/the-infectious-etiology-of-alzheimer-s-disease
#6
Marta Sochocka, Katarzyna Zwolińska, Jerzy Leszek
Inflammation is a part of the first line of defense of the body against invasive pathogens, and plays a crucial role in tissue regeneration and repair. A proper inflammatory response ensures the suitable resolution of inflammation and elimination of harmful stimuli, but when the inflammatory reactions are inappropriate it can lead to damage of the surrounding normal cells. The relationship between infections and Alzheimer's Disease (AD) etiology, especially late-onset AD (LOAD) has been continuously debated over the past three decades...
March 13, 2017: Current Neuropharmacology
https://www.readbyqxmd.com/read/28291747/crystallization-of-fcpa-from-leptospira-a-novel-flagellar-protein-that-is-essential-for-pathogenesis
#7
Fabiana San Martin, Ariel E Mechaly, Nicole Larrieux, Elsio A Wunder, Albert I Ko, Mathieu Picardeau, Felipe Trajtenberg, Alejandro Buschiazzo
The protein FcpA is a unique component of the flagellar filament of spirochete bacteria belonging to the genus Leptospira. Although it plays an essential role in translational motility and pathogenicity, no structures of FcpA homologues are currently available in the PDB. Its three-dimensional structure will unveil the novel motility mechanisms that render pathogenic Leptospira particularly efficient at invading and disseminating within their hosts, causing leptospirosis in humans and animals. FcpA from L. interrogans was purified and crystallized, but despite laborious attempts no useful X ray diffraction data could be obtained...
March 1, 2017: Acta Crystallographica. Section F, Structural Biology Communications
https://www.readbyqxmd.com/read/28291299/-neurosyphilis-in-psychiatric-settings-three-case-reports
#8
Erhan Akıncı, Fatih Öncü, Barış Topçular
Syphilis is a generally sexually transmitted and multisystem disease caused by the spirochete Treponema pallidum. All of the organs of the body may be involved during the course of the disease. Neurosyphilis is a clinical form of syphilis with the central nervous system (CNS) involvement. While primarily meningeal and vascular structures are involved in early neurosyphilis, a parenchymal affection of the brain and spinal cord emerges at later stages of neurosyphilis. It presents with symptoms of meningitis, meningovasculitis and parenchymal neurosyphilis (presenting as tabes dorsalis and general paresis)...
2017: Türk Psikiyatri Dergisi, Turkish Journal of Psychiatry
https://www.readbyqxmd.com/read/28287618/metabolomics-of-the-tick-borrelia-interaction-during-the-nymphal-tick-blood-meal
#9
J Charles Hoxmeier, Amy C Fleshman, Corey D Broeckling, Jessica E Prenni, Marc C Dolan, Kenneth L Gage, Lars Eisen
The causal agents of Lyme disease in North America, Borrelia burgdorferi and Borrelia mayonii, are transmitted primarily by Ixodes scapularis ticks. Due to their limited metabolic capacity, spirochetes rely on the tick blood meal for nutrients and metabolic intermediates while residing in the tick vector, competing with the tick for nutrients in the blood meal. Metabolomics is an effective methodology to explore dynamics of spirochete survival and multiplication in tick vectors before transmission to a vertebrate host via tick saliva...
March 13, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28270812/borrelia-burgdorferi-keeps-moving-and-carries-on-a-review-of-borrelial-dissemination-and-invasion
#10
REVIEW
Jenny A Hyde
Borrelia burgdorferi is the etiological agent of Lyme disease, a multisystemic, multistage, inflammatory infection resulting in patients experiencing cardiac, neurological, and arthritic complications when not treated with antibiotics shortly after exposure. The spirochetal bacterium transmits through the Ixodes vector colonizing the dermis of a mammalian host prior to hematogenous dissemination and invasion of distal tissues all the while combating the immune response as it traverses through its pathogenic lifecycle...
2017: Frontiers in Immunology
https://www.readbyqxmd.com/read/28270811/animal-models-of-leptospirosis-of-mice-and-hamsters
#11
REVIEW
Maria Gomes-Solecki, Ignacio Santecchia, Catherine Werts
Pathogenic Leptospira sp. are spirochetal bacteria responsible for leptospirosis, an emerging worldwide zoonosis. These spirochetes are very successful pathogens that infect a wide range of hosts such as fish, reptiles, birds, marsupials, and mammals. Transmission occurs when chronically infected animals excrete live bacteria in their urine, contaminating the environment. Leptospira sp. enter their hosts through damaged skin and mucosa. Chronically infected rats and mice are asymptomatic and are considered as important reservoirs of the disease...
2017: Frontiers in Immunology
https://www.readbyqxmd.com/read/28260786/virulence-of-the-zoonotic-agent-of-leptospirosis-still-terra-incognita
#12
REVIEW
Mathieu Picardeau
Pathogenic leptospires are the bacterial agents of leptospirosis, which is an emerging zoonotic disease that affects animals and humans worldwide. The success of leptospires as pathogens is explained by their spiral shape and endoflagellar motility (which enable these spirochetes to rapidly cross connective tissues and barriers), as well as by their ability to escape or hijack the host immune system. However, the basic biology and virulence factors of leptospires remain poorly characterized. In this Review, we discuss the recent advances in our understanding of the epidemiology, taxonomy, genomics and the molecular basis of virulence in leptospires, and how these properties contribute to the mechanism of pathogenesis of leptospirosis...
March 6, 2017: Nature Reviews. Microbiology
https://www.readbyqxmd.com/read/28256234/vancomycin-reduces-cell-wall-stiffness-and-slows-swim-speed-of-the-lyme-disease-bacterium
#13
Michael W Harman, Alex E Hamby, Ross Boltyanskiy, Alexia A Belperron, Linda K Bockenstedt, Holger Kress, Eric R Dufresne, Charles W Wolgemuth
Borrelia burgdorferi, the spirochete that causes Lyme disease, is a tick-transmitted pathogen that requires motility to invade and colonize mammalian and tick hosts. These bacteria use a unique undulating flat-wave shape to penetrate and propel themselves through host tissues. Previous mathematical modeling has suggested that the morphology and motility of these spirochetes depends crucially on the flagellar/cell wall stiffness ratio. Here, we test this prediction using the antibiotic vancomycin to weaken the cell wall...
February 28, 2017: Biophysical Journal
https://www.readbyqxmd.com/read/28238286/a-13-year-old-girl-with-pancytopenia-at-the-presentation-of-a-borrelia-hispanica-infection-a-case-report-and-review-of-the-literature
#14
Irmin Leen, Peggy Bruynseels, Benoît Kabamba Mukadi, Mark van Oort, Machiel van den Akker
BACKGROUND: It is not uncommon that a child with a febrile illness of unknown etiology is admitted to the hospital. When the complete blood count reveals a pancytopenia, the diagnostic process can be a real challenge. CASE PRESENTATION: A 13-year girl of Arab-Berber descent presented with abdominal pain and fever after a holiday in northwestern Morocco. A complete blood count revealed a pancytopenia and blood smear test results revealed spirochetes. Borrelia hispanica was identified by sequencing the 16S ribosomal ribonucleic acid gene...
February 27, 2017: Journal of Medical Case Reports
https://www.readbyqxmd.com/read/28237664/il-10-deficient-mice-express-ifn-%C3%AE-mrna-and-clear-leptospira-interrogans-from-their-kidneys-more-rapidly-than-normal-c57bl-6-mice
#15
Amy A Devlin, Priya J Halvorsen, Jennifer C Miller, Scott M Laster
Leptospira interrogans (L. interrogans), the causative agent of leptospirosis, is a widespread zoonotic spirochete that lives a dual lifestyle. L. interrogans infects mice, rats, and wildlife in a persistent and asymptomatic fashion, while also causing productive and acute infections in other mammals such as humans and hamsters. Infections in humans can be fatal, accompanied by a cytokine storm and shock-like symptoms. Production of IL-10 has been noted in both rodent and human infections which has led a number of investigators to hypothesize that IL-10 plays a role in the pathogenesis of this disease...
February 10, 2017: Immunobiology
https://www.readbyqxmd.com/read/28220718/the-big-imitator-strikes-again-a-case-report-of-neurosyphilis-in-a-patient-with-newly-diagnosed-hiv
#16
Sévérine de Bruijn, Chris Kenyon, Nicolas Léonard, Erika Vlieghe
BACKGROUND: Neurosyphilis is the result of an infection of the central nervous system caused by the spirochete Treponema pallidum. Its clinical presentation includes meningovascular syphilis, tabes dorsalis, and dementia paralytica, resulting in a wide range of symptoms such as psychosis, Parkinsonism, and depression. CASE REPORT: A 49-year-old male was admitted to a psychiatric hospital because of social withdrawal and self-neglect, indicative of a major depression...
February 21, 2017: Acta Clinica Belgica
https://www.readbyqxmd.com/read/28216574/an-in-silico-identification-of-common-putative-vaccine-candidates-against-treponema-pallidum-a-reverse-vaccinology-and-subtractive-genomics-based-approach
#17
Arun Kumar Jaiswal, Sandeep Tiwari, Syed Babar Jamal, Debmalya Barh, Vasco Azevedo, Siomar C Soares
Sexually transmitted infections (STIs) are caused by a wide variety of bacteria, viruses, and parasites that are transmitted from one person to another primarily by vaginal, anal, or oral sexual contact. Syphilis is a serious disease caused by a sexually transmitted infection. Syphilis is caused by the bacterium Treponema pallidum subspecies pallidum. Treponema pallidum (T. pallidum) is a motile, gram-negative spirochete, which can be transmitted both sexually and from mother to child, and can invade virtually any organ or structure in the human body...
February 14, 2017: International Journal of Molecular Sciences
https://www.readbyqxmd.com/read/28196664/new-records-of-ornithodoros-puertoricensis-fox-1947-ixodida-argasidae-parasitizing-humans-in-rural-and-urban-dwellings-panama
#18
Sergio E Bermúdez, Eduardo Castillo, Tyler D Pohlenz, Alexander Kneubehl, Aparna Krishnavajhala, Lillian Domínguez, Antonio Suárez, Job E López
The presence of ticks inside human constructions was evaluated in two localities from Colon province (Charco La Piedra and Espinar) and one from Panama province (Ancon, City of Panama). In two of houses, eight people from Charco La Piedra and one from Ancón reported "insect bites," which produced blisters for several weeks. The investigation resulted in the collection of argasid ticks, which were identified by morphology and sequencing the 16s ribosomal RNA gene, and later evaluated for the presence of relapsing fever Borrelia DNA...
February 5, 2017: Ticks and Tick-borne Diseases
https://www.readbyqxmd.com/read/28195158/infection-derived-lipids-elicit-an-immune-deficiency-circuit-in-arthropods
#19
Dana K Shaw, Xiaowei Wang, Lindsey J Brown, Adela S Oliva Chávez, Kathryn E Reif, Alexis A Smith, Alison J Scott, Erin E McClure, Vishant M Boradia, Holly L Hammond, Eric J Sundberg, Greg A Snyder, Lei Liu, Kathleen DePonte, Margarita Villar, Massaro W Ueti, José de la Fuente, Robert K Ernst, Utpal Pal, Erol Fikrig, Joao H F Pedra
The insect immune deficiency (IMD) pathway resembles the tumour necrosis factor receptor network in mammals and senses diaminopimelic-type peptidoglycans present in Gram-negative bacteria. Whether unidentified chemical moieties activate the IMD signalling cascade remains unknown. Here, we show that infection-derived lipids 1-palmitoyl-2-oleoyl-sn-glycero-3-phosphoglycerol (POPG) and 1-palmitoyl-2-oleoyl diacylglycerol (PODAG) stimulate the IMD pathway of ticks. The tick IMD network protects against colonization by three distinct bacteria, that is the Lyme disease spirochete Borrelia burgdorferi and the rickettsial agents Anaplasma phagocytophilum and A...
February 14, 2017: Nature Communications
https://www.readbyqxmd.com/read/28188751/r1-immunohistochemical-study-of-mucins-in-human-intestinal-spirochetosis
#20
Sho Ogata, Ken Shimizu, Susumu Tominaga, Kuniaki Nakanishi
Most patients with human intestinal spirochetosis (HIS; a colorectal bacterial infection caused by Brachyspira species) seem asymptomatic, and its pathogenicity remains unclear. Recently, alterations in mucin expression were reported in animal Brachyspira infection. The present question was "Is mucin expression altered in HIS?". Using antibodies for MUCs 1, 2, 4, 5 AC, and 6, we immunohistochemically compared 215 specimens from 83 histology-confirmed HIS cases with 106 specimens from 26 non-HIS cases. Positive staining (which included even focal positive staining) was rated "high (+)" or "low (+)"...
February 8, 2017: Human Pathology
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