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https://www.readbyqxmd.com/read/27911391/a-murine-model-of-group-b-streptococcus-vaginal-colonization
#1
Kathryn A Patras, Kelly S Doran
Streptococcus agalactiae (group B Streptococcus, GBS), is a Gram-positive, asymptomatic colonizer of the human gastrointestinal tract and vaginal tract of 10 - 30% of adults. In immune-compromised individuals, including neonates, pregnant women, and the elderly, GBS may switch to an invasive pathogen causing sepsis, arthritis, pneumonia, and meningitis. Because GBS is a leading bacterial pathogen of neonates, current prophylaxis is comprised of late gestation screening for GBS vaginal colonization and subsequent peripartum antibiotic treatment of GBS-positive mothers...
November 16, 2016: Journal of Visualized Experiments: JoVE
https://www.readbyqxmd.com/read/27909795/altered-gut-microbiota-in-ra-implications-for-treatment
#2
Y Kang, Y Cai, X Zhang, X Kong, J Su
Rheumatoid arthritis (RA) is an autoimmune disease with progressive joint disorder. The complex interplay of genetic and environmental influences is important for the development of the disease. A growing body of evidence has shed light on the association of dysbiosis of gut microbiota with RA. Certain gut microbial strains have been shown to inhibit or attenuate immune responses in RA experimental models, suggesting that specific species among intestinal commensal bacteria may play either a pathogenic or a protective role in the development of RA...
December 1, 2016: Zeitschrift Für Rheumatologie
https://www.readbyqxmd.com/read/27907047/rage-deficiency-impairs-bacterial-clearance-in-murine-staphylococcal-sepsis-but-has-no-significant-impact-on-staphylococcal-septic-arthritis
#3
Majd Mohammad, Manli Na, Amanda Welin, Mattias N D Svensson, Abukar Ali, Tao Jin, Rille Pullerits
BACKGROUND: Septic arthritis is a serious joint disease often caused by Staphylococcus aureus (S. aureus). Receptor for Advanced Glycation End products (RAGE) has an important role in several infections. We sought to investigate the role of RAGE in staphylococcal septic arthritis and sepsis in mice. METHODS: Wild-type (WT) and RAGE deficient (RAGE-/-) mice were intra-articularly or intravenously inoculated with an arthritic or septic dose of S. aureus LS-1 strain...
2016: PloS One
https://www.readbyqxmd.com/read/27904045/puerarin-prevents-lps-induced-osteoclast-formation-and-bone-loss-via-inhibition-of-akt-activation
#4
Yun Zhang, Ming Yan, Qing-Feng Yu, Pei-Fan Yang, Hai-Dong Zhang, Yong-Hong Sun, Zhi-Fen Zhang, Yun-Feng Gao
Osteolysis induced by chronic Gram-negative bacterial infection underlies many bone diseases such as osteomyelitis, septic arthritis, and periodontitis. Drugs that inhibit lipopolysaccharide (LPS)-induced osteolysis are critically needed for the prevention of bone destruction in infective bone diseases. In this study, we assessed the effect of puerarin, a natural isoflavone isolated from Pueraria lobata OHWI root, on LPS-induced osteoclastogenesis and bone loss. Our in vitro study showed that puerarin significantly inhibited LPS-induced osteoclast differentiation from osteoclast precursor RAW264...
2016: Biological & Pharmaceutical Bulletin
https://www.readbyqxmd.com/read/27902653/meningococcal-disease-in-children-in-argentina-a-three-year-active-sentinel-hospital-surveillance-study
#5
Ángela Gentile, Julia Bakir, María Rosa Agosti, Gabriela Ensinck, Hector Abate, Andrea Gajo Gane, Alejandro Santillán Iturres, Adriana Efron, Mabel Regueira, Ricardo Rüttimann
BACKGROUND: Meningococcal disease (MD) is a medical emergency and a serious public health problem. As new meningococcal vaccines become available, MD surveillance is crucial to provide baseline epidemiologic data before implementing preventive measures. We estimated MD incidence and epidemiology in Argentina using hospital-based surveillance. METHODS: 3-year prospective active surveillance in patients ≤15 years of age conducted at 6 pediatric hospital sentinel units (March 2012-February 2015)...
November 28, 2016: Pediatric Infectious Disease Journal
https://www.readbyqxmd.com/read/27902172/is-it-easy-to-clinically-distinguish-inflammatory-arthritis-of-bacterial-origin-from-monoarthritis-attacks-of-gout-disease
#6
O Şahap Atik, Yılmaz Ergişi, Tacettin Ayanoğlu, Mehmet Ali Tokgöz, Erdem Aras Sezgin, Pınar Uyar Göçün
Acute monoarthritis is a common situation in orthopedic emergency where the patient presents with typical inflamed joint. It is hard to clinically distinguish inflammatory arthritis of bacterial origin from monoarthritis attacks of gout disease. If these two situations, which are the most common causes of acute monoarthritis, are misdiagnosed, outcomes might be catastrophic and costly. Synovial fluid analysis is the most reliable method for confirming the diagnosis although it might not always lead to definitive diagnosis...
December 2016: Eklem Hastalıkları Ve Cerrahisi, Joint Diseases & related Surgery
https://www.readbyqxmd.com/read/27901071/staphylococcus-aureus-dependent-septic-arthritis-in-murine-knee-joints-local-immune-response-and-beneficial-effects-of-vaccination
#7
Alessia Corrado, Paolo Donato, Silvia Maccari, Raffaella Cecchi, Tiziana Spadafina, Letizia Arcidiacono, Simona Tavarini, Chiara Sammicheli, Donatello Laera, Andrea Guido Oreste Manetti, Paolo Ruggiero, Bruno Galletti, Sandra Nuti, Ennio De Gregorio, Sylvie Bertholet, Anja Seubert, Fabio Bagnoli, Giuliano Bensi, Emiliano Chiarot
Staphylococcus aureus is the major cause of human septic arthritis and osteomyelitis, which deserve special attention due to their rapid evolution and resistance to treatment. The progression of the disease depends on both bacterial presence in situ and uncontrolled disruptive immune response, which is responsible for chronic disease. Articular and bone infections are often the result of blood bacteremia, with the knees and hips being the most frequently infected joints showing the worst clinical outcome. We report the development of a hematogenous model of septic arthritis in murine knees, which progresses from an acute to a chronic phase, similarly to what occurs in humans...
November 30, 2016: Scientific Reports
https://www.readbyqxmd.com/read/27889698/major-involvement-of-bacterial-components-in-rheumatoid-arthritis-and-its-accompanying-oxidative-stress-systemic-inflammation-and-hypercoagulability
#8
Etheresia Pretorius, Oore-Ofe Akeredolu, Prashilla Soma, Douglas B Kell
We review the evidence that infectious agents, including those that become dormant within the host, have a major role to play in much of the etiology of rheumatoid arthritis and the inflammation that is its hallmark. This occurs in particular because they can produce cross-reactive (auto-)antigens, as well as potent inflammagens such as lipopolysaccharide that can themselves catalyze further inflammagenesis, including via β-amyloid formation. A series of observables coexist in many chronic, inflammatory diseases as well as rheumatoid arthritis...
November 25, 2016: Experimental Biology and Medicine
https://www.readbyqxmd.com/read/27870814/the-contemporary-microbiology-and-rates-of-concomitant-osteomyelitis-in-acute-septic-arthritis
#9
Jessica Branson, Jesus G Vallejo, Anthony R Flores, Kristina G Hulten, Edward O Mason, Sheldon L Kaplan, J Chase McNeil
BACKGROUND: Septic arthritis (SA) and acute osteomyelitis (AO) are among the most common serious bacterial infections of childhood. Knowledge of the microbiology of SA is critical to treatment. Awareness of the presence of attendant AO is also important to guide clinical management. We sought to describe the current microbiology of SA in children as well as describe clinical features associated with coexisting AO. MATERIALS AND METHODS: Patients with SA were identified from the infectious diseases consult service records from 2010-2014...
November 18, 2016: Pediatric Infectious Disease Journal
https://www.readbyqxmd.com/read/27867381/a-critical-reappraisal-of-neutrophil-extracellular-traps-and-netosis-mimics-based-on-differential-requirements-for-protein-citrullination
#10
Maximilian F Konig, Felipe Andrade
NETosis, an antimicrobial form of neutrophil cell death, is considered a primary source of citrullinated autoantigens in rheumatoid arthritis (RA) and immunogenic DNA in systemic lupus erythematosus (SLE). Activation of the citrullinating enzyme peptidylarginine deiminase type 4 (PAD4) is believed to be essential for neutrophil extracellular trap (NET) formation and NETosis. PAD4 is therefore viewed as a promising therapeutic target to inhibit the formation of NETs in both diseases. In this review, we examine the evidence for PAD4 activation during NETosis and provide experimental data to suggest that protein citrullination is not a universal feature of NETs...
2016: Frontiers in Immunology
https://www.readbyqxmd.com/read/27861762/gut-microbiome-in-children-with-enthesitis-related-arthritis-in-a-developing-country-and-the-effect-of-probiotic-administration
#11
Amita Aggarwal, Aditya N Sarangi, Priyanka Gaur, Anuj Shukla, Rakesh Aggarwal
In Asia, enthesitis-related arthritis (ERA) is the most-frequent category of juvenile idiopathic arthritis. ERA has a strong association with HLA-B27 and subclinical gut inflammation. In a HLA-B27 transgenic rat model, presence of Bacteroides bacteria in the gut appears to cause spondyloarthropathy (SpA). Thus, we studied gut microbiota in children with ERA. Stool specimens from 33 patients with ERA and 14 age-matched healthy controls were studied; none had any gastrointestinal symptom, or had received a drug known to affect gut motility or microbiota in the preceding 6 weeks...
November 9, 2016: Clinical and Experimental Immunology
https://www.readbyqxmd.com/read/27860302/clinical-and-genetic-association-radiological-findings-and-response-to-biological-therapy-in-seven-children-from-qatar-with-non-bacterial-osteomyelitis
#12
Taha Moussa, Venkatraman Bhat, Vishwanatha Kini, Basil M Fathalla
AIM: We aim to report the clinical manifestations, genetic testing results, magnetic resonance imaging (MRI) findings and biologics used in the management of non-bacterial osteomyelitis in our center. METHODS: We conducted a retrospective review of medical records. A previously proposed classification was implemented as follows: chronic recurrent multifocal osteomyelitis (CRMO), chronic non-bacterial osteomyelitis (CNBO) and acute non-bacterial osteomyelitis. RESULTS: Four females and three males with a median age at presentation of 6 years (6 months-14 years) presented with arthralgia (7/7), back pain (4/7), arthritis (4/7) and bone pain (2/7)...
November 9, 2016: International Journal of Rheumatic Diseases
https://www.readbyqxmd.com/read/27859670/leprosy-reactions-in-post-elimination-stage-the-bangladesh-experience
#13
Mohammad Rafiqul Mowla, Shamim Ara, Afm Mizanur Rahman, Sanai Prue Tripura, Sujat Paul
BACKGROUND: Leprosy reactions are immunologically mediated conditions and a major cause of disability before, during and after multidrug therapy. Little data has been published on the epidemiology of leprosy reactions in Bangladesh. OBJECTIVES: To describe the pattern and prevalence of leprosy reactions in the post elimination stage. METHODS: A descriptive retrospective cross-sectional study was carried out in Chittagong Medical College Hospital using the registered records of patients the periods between 2004 and 2013...
November 15, 2016: Journal of the European Academy of Dermatology and Venereology: JEADV
https://www.readbyqxmd.com/read/27857714/t-cells-exacerbate-lyme-borreliosis-in-tlr2-deficient-mice
#14
Carrie E Lasky, Carmela L Pratt, Kinsey A Hilliard, John L Jones, Charles R Brown
Infection of humans with the spirochete, Borrelia burgdorferi, causes Lyme borreliosis and can lead to clinical manifestations such as arthritis, carditis, and neurological conditions. Experimental infection of mice recapitulates many of these symptoms and serves as a model system for the investigation of disease pathogenesis and immunity. Innate immunity is known to drive the development of Lyme arthritis and carditis, but the mechanisms driving this response remain unclear. Innate immune cells recognize B...
2016: Frontiers in Immunology
https://www.readbyqxmd.com/read/27855721/the-lung-microbiota-in-early-rheumatoid-arthritis-and-autoimmunity
#15
Jose U Scher, Vijay Joshua, Alejandro Artacho, Shahla Abdollahi-Roodsaz, Johan Öckinger, Susanna Kullberg, Magnus Sköld, Anders Eklund, Johan Grunewald, Jose C Clemente, Carles Ubeda, Leopoldo N Segal, Anca I Catrina
BACKGROUND: Airway abnormalities and lung tissue citrullination are found in both rheumatoid arthritis (RA) patients and individuals at-risk for disease development. This suggests the possibility that the lung could be a site of autoimmunity generation in RA, perhaps in response to microbiota changes. We therefore sought to test whether the RA lung microbiome contains distinct taxonomic features associated with local and/or systemic autoimmunity. METHODS: 16S rRNA gene high-throughput sequencing was utilized to compare the bacterial community composition of bronchoalveolar lavage fluid (BAL) in patients with early, disease-modifying anti-rheumatic drugs (DMARD)-naïve RA, patients with lung sarcoidosis, and healthy control subjects...
November 17, 2016: Microbiome
https://www.readbyqxmd.com/read/27848164/septic-arthritis-due-to-legionella-cincinnatiensis-case-report-and-review-of-the-literature
#16
Florian Banderet, Annette Blaich, Evelin Soleman, Valeria Gaia, Michael Osthoff
Legionella spp. are an important cause of pulmonary and rarely extrapulmonary infections. L. cincinnatiensis has only been implicated in five cases to date. We herein report the first case of L. cincinnatiensis septic arthritis in a 90-year old lady with a past medical history of chronic kidney disease. She developed septic arthritis of her left wrist after having received intraarticular corticosteroid injections and oral corticosteroids administered for presumed chondrocalcinosis. Appropriate antimicrobial treatment of L...
November 15, 2016: Infection
https://www.readbyqxmd.com/read/27833598/alteration-of-fecal-microbiota-profiles-in-juvenile-idiopathic-arthritis-associations-with-hla-b27-allele-and-disease-status
#17
Monica Di Paola, Duccio Cavalieri, Davide Albanese, Maddalena Sordo, Massimo Pindo, Claudio Donati, Ilaria Pagnini, Teresa Giani, Gabriele Simonini, Alessia Paladini, Paolo Lionetti, Carlotta De Filippo, Rolando Cimaz
Alteration of gut microbiota is involved in several chronic inflammatory and autoimmune diseases, including rheumatoid arthritis, and gut microbial "pro-arthritogenic" profiles have been hypothesized. Intestinal inflammation may be involved in spondyloarthropathies and in a subset of patients affected by Juvenile Idiopathic Arthritis (JIA), the most common chronic rheumatic disease of childhood. We compared the fecal microbiota composition of JIA patients with healthy subjects (HS), evaluating differences in microbial profiles between sub-categories of JIA, such as enthesitis-related arthritis (JIA-ERA), in which inflammation of entheses occurs, and polyarticular JIA, non-enthesitis related arthritis (JIA-nERA)...
2016: Frontiers in Microbiology
https://www.readbyqxmd.com/read/27812365/shared-genetic-etiology-of-autoimmune-diseases-in-patients-from-a-biorepository-linked-to-de-identified-electronic-health-records
#18
Nicole A Restrepo, Mariusz Butkiewicz, Josephine A McGrath, Dana C Crawford
: Autoimmune diseases represent a significant medical burden affecting up to 5-8% of the U.S. POPULATION: While genetics is known to play a role, studies of common autoimmune diseases are complicated by phenotype heterogeneity, limited sample sizes, and a single disease approach. Here we performed a targeted genetic association study for cases of multiple sclerosis (MS), rheumatoid arthritis (RA), and Crohn's disease (CD) to assess which common genetic variants contribute individually and pleiotropically to disease risk...
2016: Frontiers in Genetics
https://www.readbyqxmd.com/read/27811267/pain-regulation-by-non-neuronal-cells-and-inflammation
#19
REVIEW
Ru-Rong Ji, Alexander Chamessian, Yu-Qiu Zhang
Acute pain is protective and a cardinal feature of inflammation. Chronic pain after arthritis, nerve injury, cancer, and chemotherapy is associated with chronic neuroinflammation, a local inflammation in the peripheral or central nervous system. Accumulating evidence suggests that non-neuronal cells such as immune cells, glial cells, keratinocytes, cancer cells, and stem cells play active roles in the pathogenesis and resolution of pain. We review how non-neuronal cells interact with nociceptive neurons by secreting neuroactive signaling molecules that modulate pain...
November 4, 2016: Science
https://www.readbyqxmd.com/read/27807193/ptpn22-is-a-critical-regulator-of-fc%C3%AE-receptor-mediated-neutrophil-activation
#20
Sonja Vermeren, Katherine Miles, Julia Y Chu, Donald Salter, Rose Zamoyska, Mohini Gray
Neutrophils act as a first line of defense against bacterial and fungal infections, but they are also important effectors of acute and chronic inflammation. Genome-wide association studies have established that the gene encoding the protein tyrosine phosphatase nonreceptor 22 (PTPN22) makes an important contribution to susceptibility to autoimmune disease, notably rheumatoid arthritis. Although PTPN22 is most highly expressed in neutrophils, its function in these cells remains poorly characterized. We show in this article that neutrophil effector functions, including adhesion, production of reactive oxygen species, and degranulation induced by immobilized immune complexes, were reduced in Ptpn22(-/-) neutrophils...
November 2, 2016: Journal of Immunology: Official Journal of the American Association of Immunologists
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