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Actinomyces

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https://www.readbyqxmd.com/read/29228609/bacteriome-and-mycobiome-associations-in-oral-tongue-cancer
#1
Pranab K Mukherjee, Hannah Wang, Mauricio Retuerto, Huan Zhang, Brian Burkey, Mahmoud A Ghannoum, Charis Eng
Squamous cell carcinoma of the oral (mobile) tongue (OMTC), a non-human papilloma virus-associated oral cancer, is rapidly increasing without clear etiology. Poor oral hygiene has been associated with oral cancers, suggesting that oral bacteriome (bacterial community) and mycobiome (fungal community) could play a role. While the bacteriome is increasingly recognized as an active participant in health, the role of the mycobiome has not been studied in OMTC. Tissue DNA was extracted from 39 paired tumor and adjacent normal tissues from patients with OMTC...
November 14, 2017: Oncotarget
https://www.readbyqxmd.com/read/29225362/frequency-of-bacetrial-content-finding-in-persistant-periapical-lesions
#2
Joško Grgurević, Ana Ivanišević Malčić, Arjana Tambić Andrašević, Goranka Prpić Mehičić, Sania Kuzmac, Silvana Jukić
Objectives: To determine the percentage of persistant apical lesions positive for bacterial nucleic acids, to detect microorganisms difficult to cultivate in persistant apical lesions by PCR and relate them to endodontic failure, clinical symptoms and diabetes mellitus. Materials and methods: The samples of persistent apical lesions were collected during apicoectomy. Bacterial ubiquitous primer 16S rRNA was used to detect 16S ribosomal RNA in 36 samples. A species-specific PCR was performed with primers targeted to the bacterial 16S rRNA genes of Prevotella Nigrescens, Pseudoramibacter alactolyticus, and Propionobacterium propionicum...
September 2017: Acta Stomatologica Croatica
https://www.readbyqxmd.com/read/29214754/utility-of-conventional-culture-and-maldi-tof-ms-for-identification-of-microbial-communities-in-bronchoalveolar-lavage-fluid-in-comparison-with-the-gs-junior-next-generation-sequencing-system
#3
Ji Yeon Sung, Younjee Hwang, Mi Hwa Shin, Moo Suk Park, Sang Hoon Lee, Dongeun Yong, Kyungwon Lee
BACKGROUND: Diverse microbiota exist in the lower respiratory tract. Although next generation sequencing (NGS) is the most widely used microbiome analysis technique, it is difficult to implement NGS in clinical microbiology laboratories. Therefore, we evaluated the performance of conventional culture methods together with matrix-assisted laser desorption/ionization time-of-flight mass spectrometry (MALDI-TOF MS) in identifying microbiota in bronchoalveolar lavage (BAL) fluid. METHODS: BAL fluid samples (n=27) were obtained from patients undergoing diagnostic bronchoscopy for lung mass evaluation...
March 2018: Annals of Laboratory Medicine
https://www.readbyqxmd.com/read/29211122/actinomycosis-is-not-frequent-in-the-periapex-but-is-a-persistent-lesion
#4
Lucas Senhorinho Esteves, Águida Cristina Gomes Henriques, Carolina Ávila Varginha de Moraes E Silva, Maria Cristina Teixeira Cangussu, Eduardo Antônio Gonçalves Ramos, Carlos Estrela, Jean Nunes Dos Santos
Periapical actinomycosis caused by a gram-positive anaerobic pathogen characterizes a typical extra-radicular infection. This study determined the frequency and correlated the content of bacteria colonies with the of periapical actinomycosis size. The study comprised a total of 218 periapical lesions (PL) (cysts, granulomas or abscess). The specimens embedded in paraffin were sliced into 4-µm sections and stained with hematoxylin-eosin, Gram, Periodic Acid-Schiff (PAS) and Grocott's stain. The presence of bacterial colonies composed of filamentous structures labeled with the histochemical stains were described as Actinomyces, and for each case, the bacterial colonies were counted and measured...
November 2017: Brazilian Dental Journal
https://www.readbyqxmd.com/read/29202047/subgingival-microbiome-colonization-and-cytokine-production-during-early-dental-implant-healing
#5
Jeffrey B Payne, Paul G Johnson, Car Reen Kok, João C Gomes-Neto, Amanda E Ramer-Tait, Marian J Schmid, Robert W Hutkins
Little is known about longitudinal development of the peri-implant subgingival microbiome and cytokine production as a new sulcus forms after dental implant placement. Therefore, the purpose of this observational study was to evaluate simultaneous longitudinal changes in the oral microbiome and cytokine production in the developing peri-implant sulcus compared to control natural teeth. Four and 12 weeks after implant placement and abutment connection, a dental implant and a natural tooth were sampled in 25 patients for subgingival plaque and gingival crevicular fluid (GCF [around teeth] and peri-implant crevicular fluid [PICF] around implants)...
November 2017: MSphere
https://www.readbyqxmd.com/read/29180991/gut-microbial-dysbiosis-is-associated-with-altered-hepatic-functions-and-serum-metabolites-in-chronic-hepatitis-b-patients
#6
Jing Wang, Yang Wang, Xu Zhang, Jiaqi Liu, Qianpeng Zhang, Yu Zhao, Jinghua Peng, Qin Feng, Jianye Dai, Shujun Sun, Yufeng Zhao, Liping Zhao, Yongyu Zhang, Yiyang Hu, Menghui Zhang
Chronic hepatitis B (CHB) is a global epidemic disease that results from hepatitis B virus (HBV) infection and may progress to severe liver failure, including liver fibrosis, cirrhosis and hepatocellular carcinoma. Previous evidence has indicated that the dysbiosis of gut microbiota occurs after liver virus infection and is associated with severe liver disease. The aim of this study is to elucidate the compositional and functional characteristics of the gut microbiota in early-stage CHB and to understand their influence on disease progression...
2017: Frontiers in Microbiology
https://www.readbyqxmd.com/read/29177692/dermatological-complications-after-solid-organ-transplantation
#7
REVIEW
Luigi Naldi, Anna Venturuzzo, Pietro Invernizzi
Organ transplant recipients (OTRs) are a population at high risk for cutaneous adverse events. Their early recognition and appropriate treatment is an important component of the clinical management of OTRs and should be optimally dealt with by dermatologists working in the context of a transplant dermatology clinic. Skin examination should be a standard procedure before performing organ transplantation to assess conditions which may be difficult to manage after the transplant procedure has been performed or which may represent a contraindication to transplantation, e...
November 25, 2017: Clinical Reviews in Allergy & Immunology
https://www.readbyqxmd.com/read/29173365/actinomyces-peritonitis-a-unique-therapy
#8
Aaron Coulon, Rahul Kamat, Ashwin Jaikishen, Mihran Naljayan
No abstract text is available yet for this article.
November 2017: American Journal of the Medical Sciences
https://www.readbyqxmd.com/read/29170959/crispr-cas9-toolkit-for-actinomycete-genome-editing
#9
Yaojun Tong, Helene Lunde Robertsen, Kai Blin, Tilmann Weber, Sang Yup Lee
Bacteria of the order Actinomycetales are one of the most important sources of bioactive natural products, which are the source of many drugs. However, many of them still lack efficient genome editing methods, some strains even cannot be manipulated at all. This restricts systematic metabolic engineering approaches for boosting known and discovering novel natural products. In order to facilitate the genome editing for actinomycetes, we developed a CRISPR-Cas9 toolkit with high efficiency for actinomyces genome editing...
2018: Methods in Molecular Biology
https://www.readbyqxmd.com/read/29156630/anti-bacteria-and-microecosystem-regulating-effects-of-dental-implant-coated-with-dimethylaminododecyl-methacrylate
#10
Bolei Li, Yang Ge, Yao Wu, Jing Chen, Hockin H K Xu, Minggang Yang, Mingyun Li, Biao Ren, Mingye Feng, Michael D Weir, Xian Peng, Lei Cheng, Xuedong Zhou
The effects of dimethylaminododecyl methacrylate (DMADDM) modified titanium implants on bacterial activity and microbial ecosystem of saliva-derived biofilm were investigated for the first time. Titanium discs were coated with DMADDM solutions at mass fractions of 0 mg/mL (control), 1, 5 and 10 mg/mL, respectively. Biomass accumulation and metabolic activity of biofilms were tested using crystal violet assay and MTT (3-(4,5-Dimethyl-thiazol-2-yl)-2,5-diphenyltetrazolium bromide) assay. 16S rRNA gene sequencing was performed to measure the microbial community...
November 20, 2017: Molecules: a Journal of Synthetic Chemistry and Natural Product Chemistry
https://www.readbyqxmd.com/read/29152146/breast-tissue-oral-and-urinary-microbiomes-in-breast-cancer
#11
Hannah Wang, Jessica Altemus, Farshad Niazi, Holly Green, Benjamin C Calhoun, Charles Sturgis, Stephen R Grobmyer, Charis Eng
It has long been proposed that the gut microbiome contributes to breast carcinogenesis by modifying systemic estrogen levels. This is often cited as a possible mechanism linking breast cancer and high-fat, low-fiber diets as well as antibiotic exposure, associations previously identified in population-based studies. More recently, a distinct microbiome has been identified within breast milk and tissue, but few studies have characterized differences in the breast tissue microbiota of patients with and without cancer, and none have investigated distant body-site microbiomes outside of the gut...
October 20, 2017: Oncotarget
https://www.readbyqxmd.com/read/29150122/neonatal-sepsis-secondary-to-chorioamnionitis-by-actinomyces-neuii-in-a-25-weeks-pregnant-woman
#12
Patricia Giron de Velasco-Sada, Helena Peinado, María Pilar Romero-Gómez
No abstract text is available yet for this article.
November 14, 2017: Medicina Clínica
https://www.readbyqxmd.com/read/29132943/breast-abscess-due-to-actinomyces-turicensis-in-a-non-puerperal-woman
#13
Fernando Cobo
No abstract text is available yet for this article.
November 10, 2017: Enfermedades Infecciosas y Microbiología Clínica
https://www.readbyqxmd.com/read/29124888/differential-oxidative-stress-tolerance-of-streptococcus-mutans-isolates-affects-competition-in-an-ecological-mixed-species-biofilm-model
#14
Yuan Liu, Sara R Palmer, Hsiaochi Chang, Ashton N Combs, Robert A Burne, Hyun Koo
Streptococcus mutans strongly influences the development of pathogenic biofilms associated with dental caries. Our understanding of S. mutans behavior in biofilms is based on a few well-characterized laboratory strains; however, individual isolates vary widely in genome content and virulence-associated phenotypes, such as biofilm formation and environmental stress sensitivity. Using an ecological biofilm model, we assessed the impact of co-cultivation of several S. mutans isolates with Streptococcus oralis and Actinomyces naeslundii on biofilm composition following exposure to sucrose...
November 10, 2017: Environmental Microbiology Reports
https://www.readbyqxmd.com/read/29118685/a-rare-thermophilic-bug-in-complicated-diverticular-abscess
#15
Kyawzaw Lin, Sithu Lin, Aung Naing Lin, Thinzar Lin, Zin Mar Htun, Madhavi Reddy
Actinomycosis is a form of painful abscess in the gastrointestinal tract or in deep tissue caused by actinomyces species. They are one of the commensal bacteria in the oral cavity and gastrointestinal tract of humans but can opportunistically cause infection in immunosuppressive hosts through invasion of breached mucosa or necrotic tissue while mimicking malignancy, gastrointestinal tuberculosis, and inflammatory bowel disease. Actinomyces israelii is, by far, the major and most common human pathogen throughout literatures...
September 2017: Case Reports in Gastroenterology
https://www.readbyqxmd.com/read/29116300/cymbopogon-citratus-essential-oil-effect-on-polymicrobial-caries-related-biofilm-with-low-cytotoxicity
#16
Maria Alcionéia Carvalho de Oliveira, Aline Chiodi Borges, Fernanda Lourenção Brighenti, Marcos José Salvador, Aline Vidal Lacerda Gontijo, Cristiane Yumi Koga-Ito
The objective of this study was to evaluate the effects of Cymbopogon citratus essential oil and its main compound (citral) against primary dental colonizers and caries-related species. Chemical characterization of the essential oil was performed by gas chromatography/mass spectroscopy (GC/MS), and the main compound was determined. Antimicrobial activity was tested against Actinomyces naeslundii, Lactobacillus acidophilus, S. gordonii, S. mitis, S. mutans, S. sanguinis and S. sobrinus. Minimum inhibitory and bactericide concentrations were determined by broth microdilution assay for streptococci and lactobacilli reference, and for clinical strains...
November 6, 2017: Brazilian Oral Research
https://www.readbyqxmd.com/read/29109842/submental-perforator-flap-for-soft-tissue-reconstruction-in-bisphosphonate-related-osteonecrosis-of-the-jaws
#17
Jose-Antonio García-de Marcos, Juan Rey-Biel
Bisphosphonate-related osteonecrosis of the jaws (BRONJ) has emerged as an important and increasingly common comorbidity, especially in patients undergoing long-term treatment with high doses of bisphosphonates. The management of BRONJ remains controversial. Surgical treatment is necessary in severe cases. Treatment of the bone requires sequestrectomy or resection. Given the lack of sufficient mucosa to perform the operation and fragility of margins in many patients, local flaps are crucial. We report two cases of stage-3 BRONJ presenting secondary infection with Actinomyces , receiving treatment consisting of marginal resection of the necrotic bone, reinforcement with a reconstruction plate, and reconstruction of soft tissues using a submental perforator artery flap ipsilateral to the lesion...
December 2017: Craniomaxillofacial Trauma & Reconstruction
https://www.readbyqxmd.com/read/29081982/the-making-of-a-miscreant-tobacco-smoke-and-the-creation-of-pathogen-rich-biofilms
#18
Samir A Shah, Sukirth M Ganesan, Saradhadevi Varadharaj, Shareef M Dabdoub, John D Walters, Purnima S Kumar
We have previously reported that oral biofilms in clinically healthy smokers are pathogen-rich, and that this enrichment occurs within 24 h of biofilm formation. The present investigation aimed to identify a mechanism by which smoking creates this altered community structure. By combining in vitro microbial-mucosal interface models of commensal (consisting of Streptococcus oralis, Streptococcus sanguis, Streptococcus mitis, Actinomyces naeslundii, Neisseria mucosa and Veillonella parvula) and pathogen-rich (comprising S...
2017: NPJ Biofilms and Microbiomes
https://www.readbyqxmd.com/read/29081915/osteopontin-adsorption-to-gram-positive-cells-reduces-adhesion-forces-and-attachment-to-surfaces-under-flow
#19
M F Kristensen, G Zeng, T R Neu, R L Meyer, V Baelum, S Schlafer
The bovine milk protein osteopontin (OPN) may be an efficient means to prevent bacterial adhesion to dental tissues and control biofilm formation. This study sought to determine to what extent OPN impacts adhesion forces and surface attachment of different bacterial strains involved in dental caries or medical device-related infections. It further investigated if OPN's effect on adhesion is caused by blocking the accessibility of glycoconjugates on bacterial surfaces. Bacterial adhesion was determined in a shear-controlled flow cell system in the presence of different concentrations of OPN, and interaction forces of single bacteria were quantified using single-cell force spectroscopy before and after OPN exposure...
2017: Journal of Oral Microbiology
https://www.readbyqxmd.com/read/29081913/effect-of-maltitol-containing-chewing-gum-use-on-the-composition-of-dental-plaque-microbiota-in-subjects-with-active-dental-caries
#20
Erica M Prosdocimi, James O Kistler, Rebecca Moazzez, Clementine Thabuis, Caroline Perreau, William G Wade
Background: Sugar alcohols such as xylitol are incorporated in a number of oral hygiene products for their anti-cariogenic properties while chewing gum is known to be beneficial to oral hygiene. Objective: The aim of this study was to determine the composition of the dental plaque microbiota in patients with active caries before and after using a chewing gum supplemented with maltitol. Design : Forty subjects with active caries were randomly allocated to chew maltitol gum or gum base for two weeks. A healthy control group used gum base for two weeks...
2017: Journal of Oral Microbiology
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