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https://www.readbyqxmd.com/read/27913142/candida-species-from-oral-cavity-of-hiv-infected-children-exhibit-reduced-virulence-factors-in-the-haart-era
#1
Maristela Barbosa Portela, Elaine Lima de Amorim, Adrielle Mangabeira Santos, José Alexandre da Rocha Curvelo, Karol de Oliveira Martins, Cauli Lima Capillé, Rosangela Maria de Araújo Soares, Gloria Fernanda Barbosa de Araújo Castro
This study aimed to assess, in vitro, the biofilm viability and the phospholipase and protease production of Candida spp. from the saliva of HIV infected children and healthy controls, and to correlate the results with the use of medical data. A total of 79 isolates were analyzed: 48 Candida albicans isolates (33/15) and 20 Candida parapsilosis sensu lato complex isolates (12/8) (from HIV/control patients, respectively), and 8 Candida krusei, 1 Candida tropicalis, 1 Candida dubliniensis and 1 Candida guilliermondii from HIV patients...
November 29, 2016: Microbial Pathogenesis
https://www.readbyqxmd.com/read/27910930/design-of-a-hydroxyapatite-binding-antimicrobial-peptide-with-improved-retention-and-antibacterial-efficacy-for-oral-pathogen-control
#2
Zhi-Bin Huang, Xin Shi, Jing Mao, Shi-Qiang Gong
Controlling and reducing the formation of pathogenic biofilm on tooth surface is the key to the prevention and treatment of the biofilm-associated oral diseases. Antimicrobial peptides (AMPs), considered as possible future alternatives for conventional antibiotics, have been extensively studied for the control of bacterial infection. Due to the rapid dilution and degradation by human saliva, AMP preparations designed for oral use with longer retention and higher efficacy are in urgent need. To this end, a hydroxyapatite (HAp)-binding antimicrobial peptide (HBAMP), which is based on the fusion of a specific HAp-binding heptapeptide (HBP7) domain and a broad-spectrum antimicrobial peptide (KSLW) domain, has been developed in our laboratory...
December 2, 2016: Scientific Reports
https://www.readbyqxmd.com/read/27903262/evaluation-of-salvadora-persica-l-and-green-tea-anti-plaque-effect-a-randomized-controlled-crossover-clinical-trial
#3
Hayder Raad Abdulbaqi, Wan Harun Himratul-Aznita, Nor Adinar Baharuddin
BACKGROUND: In the author's earlier in vitro investigation, a combination of 0.25 mg/ml green tea and 7.82 mg/ml Salvadora persica L. aqueous extracts was found to exhibit significant synergistic anti-bacterial and anti-adherence effects against primary plaque colonizers biofilm. A clinical trial was needed to support these preliminary in vitro results and to investigate its efficacy as a mouthwash in the control of dental plaque. METHODS: A 24 h plaque re-growth, double-blinded, randomized crossover trial was carried out...
December 1, 2016: BMC Complementary and Alternative Medicine
https://www.readbyqxmd.com/read/27897256/dysbiosis-by-neutralizing-commensal-mediated-inhibition-of-pathobionts
#4
Esteban Rodriguez Herrero, Vera Slomka, Nico Boon, Kristel Bernaerts, Emma Hernandez-Sanabria, Marc Quirynen, Wim Teughels
Dysbiosis in the periodontal microbiota is associated with the development of periodontal diseases. Little is known about the initiation of dysbiosis. It was hypothesized that some commensal bacteria suppress the outgrowth of pathobionts by H2O2 production. However, serum and blood components released due to inflammation can neutralize this suppressive effect, leading to the initiation of dysbiosis. Agar plate, dual-species and multi-species ecology experiments showed that H2O2 production by commensal bacteria decreases pathobiont growth and colonization...
November 29, 2016: Scientific Reports
https://www.readbyqxmd.com/read/27897199/hydroxychavicol-a-phytochemical-targeting-cutaneous-fungal-infections
#5
Intzar Ali, Naresh Kumar Satti, Prabhu Dutt, Rajendra Prasad, Inshad Ali Khan
The present study was designed to investigate the potency of hydroxychavicol on selected cutaneous human pathogenic fungi by the use of in vitro and in vivo assays and mechanistic characterization along with toxicological effects. Hydroxychavicol consistently displayed a fungicidal effect against all fungal species tested. Inoculum concentrations over the range of 10(4) to 10(7) CFU/ml did not significantly alter its antifungal potential and time-kill curve results revealed concentration-dependent killing...
November 29, 2016: Scientific Reports
https://www.readbyqxmd.com/read/27892717/dental-implants-modified-with-drug-releasing-titania-nanotubes-therapeutic-potential-and-developmental-challenges
#6
Karan Gulati, Sašo Ivanovski
The trans-mucosal nature of dental implants presents a unique therapeutic challenge, requiring not only rapid establishment and subsequent maintenance of osseointegration, but also the formation of resilient soft tissue integration. Key challenges in achieving long-term success are sub-optimal bone integration in compromised bone conditions and impaired trans-mucosal tissue integration in the presence of a persistent oral microbial biofilm. These challenges can be targeted by employing a drug-releasing implant modification such as TiO2 nanotubes (TNTs), engineered on titanium surfaces via electrochemical anodization...
November 28, 2016: Expert Opinion on Drug Delivery
https://www.readbyqxmd.com/read/27890003/biofilm-mediated-antibiotic-resistant-oral-bacterial
#7
Indu Lata Kanwar, Abhishek Kumar Sah, Preeti K Suresh
Oral diseases like dental caries and periodontal disease are directly associated with the capability of bacteria to form biofilm. Periodontal diseases have been associated to anaerobic Gram-negative bacteria forming a subgingival plaque (Porphyromonas gingivalis, Actinobacillus, Prevotella and Fusobacterium). Biofilm is a complex bacterial community that is highly resistant to antibiotics and human immunity. Biofilm communities are the causative agents of biological developments such as dental caries, periodontitis, and peri-implantitis, and causing periodontal tissue breakdown...
November 24, 2016: Current Pharmaceutical Design
https://www.readbyqxmd.com/read/27880799/treatment-of-oral-biofilms-by-a-d-enantiomeric-peptide
#8
Tian Zhang, Zhejun Wang, Robert E W Hancock, César de la Fuente-Núñez, Markus Haapasalo
Almost all dental diseases are caused by biofilms that consist of multispecies communities. DJK-5, which is a short D-enantiomeric, protease-resistant peptide with broad-spectrum anti-biofilm activity, was tested for its effect on oral multispecies biofilms. Peptide DJK-5 at 10 μg/mL effectively prevented the growth of these microbes in culture media in a time-dependent manner. In addition to the prevention of growth, peptide DJK-5 completely killed both Streptococcus mutans and Enterococcus faecalis suspended from biofilms after 30 minutes of incubation in liquid culture media...
2016: PloS One
https://www.readbyqxmd.com/read/27869109/effect-of-red-dyes-on-blue-light-phototoxicity-against-vsc-producing-bacteria-in-an-experimental-oral-biofilm
#9
U Jeffet, R Nasrallah, N Sterer
Oral malodour is considered to be caused mainly by the production of volatile sulfide compounds (VSC) by anaerobic Gram-negative oral bacteria. Previous study showed that these bacteria were susceptible to blue light (wavelengths of 400-500 nm). In the present study, we tested the effect of blue light in the presence of red dyes on malodour production in an experimental oral biofilm. Biofilms were exposed to a plasma-arc light source for 30, 60, and 120 s (i.e. fluences of 41, 82, and 164 J cm(-2), respectively) with the addition of erythrosine, natural red and rose bengal (0...
November 21, 2016: Journal of Breath Research
https://www.readbyqxmd.com/read/27864174/multilocus-sequence-analysis-of-phylogroup-1-and-2-oral-treponeme-strains
#10
Yong-Biao Huo, Yuki Chan, Donnabella C Lacap-Bugler, Sisu Mo, Patrick C Y Woo, W Keung Leung, Rory M Watt
: More than 75 'species-level' phylotypes of spirochete bacteria belonging to the genus Treponema reside within the human oral cavity. The majority of these oral treponeme phylotypes correspond to as-yet uncultivated taxa, or strains of uncertain standing in taxonomy. Here, we analyze phylogenetic and taxonomic relationships between oral treponeme strains using a multilocus sequence analysis (MLSA) scheme based on the highly-conserved 16S rRNA, pyrH, recA and flaA genes. We utilize this MLSA scheme to analyze genetic data from a curated collection of oral treponeme strains (n=71) of diverse geographical origins...
November 18, 2016: Applied and Environmental Microbiology
https://www.readbyqxmd.com/read/27856967/nanosized-building-blocks-for-customizing-novel-antibiofilm-approaches
#11
A J Paula, H Koo
Recent advances in nanotechnology provide unparalleled flexibility to control the composition, size, shape, surface chemistry, and functionality of materials. Currently available engineering approaches allow precise synthesis of nanocompounds (e.g., nanoparticles, nanostructures, nanocrystals) with both top-down and bottom-up design principles at the submicron level. In this context, these "nanoelements" (NEs) or "nanosized building blocks" can 1) generate new nanocomposites with antibiofilm properties or 2) be used to coat existing surfaces (e...
November 16, 2016: Journal of Dental Research
https://www.readbyqxmd.com/read/27846284/mutation-of-the-streptococcus-gordonii-thiol-disulfide-oxidoreductase-sdba-leads-to-enhanced-biofilm-formation-mediated-by-the-ciarh-two-component-signaling-system
#12
Lauren Davey, Scott A Halperin, Song F Lee
Streptococcus gordonii is a commensal inhabitant of human oral biofilms. Previously, we identified an enzyme called SdbA that played an important role in biofilm formation by S. gordonii. SdbA is thiol-disulfide oxidoreductase that catalyzes disulfide bonds in secreted proteins. Surprisingly, inactivation of SdbA results in enhanced biofilm formation. In this study we investigated the basis for biofilm formation by the ΔsdbA mutant. The results revealed that biofilm formation was mediated by the interaction between the CiaRH and ComDE two-component signalling systems...
2016: PloS One
https://www.readbyqxmd.com/read/27845274/potential-applications-of-antimicrobial-peptides-and-their-mimics-in-combating-caries-and-pulpal-infections
#13
REVIEW
Sui Mai, Matthew T Mauger, Li-Na Niu, Jonathan B Barnes, Solon Kao, Brian E Bergeron, Jun-Qi Ling, Franklin R Tay
: Antimicrobial peptides (AMPs) are short cationic host-defense molecules that provide the early stage of protection against invading microbes. They also have important modulatory roles and act as a bridge between innate and acquired immunity. The types and functions of oral AMPs were reviewed and experimental reports on the use of natural AMPs and their synthetic mimics in caries and pulpal infections were discussed. Natural AMPs in the oral cavity, predominantly defensins, cathelidin and histatins, possess antimicrobial activities against oral pathogens and biofilms...
November 11, 2016: Acta Biomaterialia
https://www.readbyqxmd.com/read/27842482/antibiotic-release-from-calcium-phosphate-materials-in-oral-and-maxillofacial-surgery-molecular-cellular-and-pharmaceutical-aspects
#14
Angel Manchon, Juan Carlos Prados-Frutos, Carmen Rueda Rodriguez, Carmen Salinas Goodier, Mohammad Hadman Alkhraisat, Rosa Rojo, Arantza Rodriguez Gonzalez, Ana Berlanga, Enrique Lopez Cabarcos
Calcium phosphate materials (CPM) are widely used in dentistry and maxillofacial surgery. The presence of microbial biofilms and external infections are responsible for the failure of many procedures of dental implants and bone grafts. In an attempt to reduce the percentage of these infectious processes antibiotics have been associated with CPM improving certain conditions. For instance antibiotics administered orally or intravenously have less effect and the blood flow in relation to this is poor near implants and grafts...
November 14, 2016: Current Pharmaceutical Biotechnology
https://www.readbyqxmd.com/read/27835926/mouthwashes-in-the-21-st-century-a-narrative-review-about-active-molecules-and-effectiveness-on-the-periodontal-outcomes
#15
Gianluca M Tartaglia, Santhosh Kumar, Claudia Debora Fornari, Eleonora Corti, Stephen Thaddeus Connelly
Poor oral hygiene is a major risk factor for oral diseases. Regular home-based care is essential to maintain good oral hygiene. In particular, mouthrinses can support conventional tooth brushing in reducing accumulation of oral plaque. Areas covered: The most common molecules contained in mouthrinses (chlorhexidine, essential oils, cetyl pyridinium chloride, triclosan, octeneidine, delmopinol, polyvinylpyrrolidone, hyaluronic acid, natural compounds) are discussed, together with relevant clinical and in vitro studies, focusing on their effects on periodontal health...
November 20, 2016: Expert Opinion on Drug Delivery
https://www.readbyqxmd.com/read/27822519/comprehensive-transcriptome-profiles-of-streptococcus-mutans-ua159-map-core-streptococcal-competence-genes
#16
R Khan, H V Rukke, H Høvik, H A Åmdal, T Chen, D A Morrison, F C Petersen
In Streptococcus mutans, an oral colonizer associated with dental caries, development of competence for natural genetic transformation is triggered by either of two types of peptide pheromones, competence-stimulating peptides (CSPs) (18 amino acids [aa]) or SigX-inducing peptides (XIPs) (7 aa). Competence induced by CSP is a late response to the pheromone that requires the response regulator ComE and the XIP-encoding gene comS. XIP binds to ComR to allow expression of the alternative sigma factor SigX and the effector genes it controls...
March 2016: MSystems
https://www.readbyqxmd.com/read/27820867/triethylene-glycol-up-regulates-virulence-associated-genes-and-proteins-in-streptococcus-mutans
#17
Lida Sadeghinejad, Dennis G Cvitkovitch, Walter L Siqueira, J Paul Santerre, Yoav Finer
Triethylene glycol dimethacrylate (TEGDMA) is a diluent monomer used pervasively in dental composite resins. Through hydrolytic degradation of the composites in the oral cavity it yields a hydrophilic biodegradation product, triethylene glycol (TEG), which has been shown to promote the growth of Streptococcus mutans, a dominant cariogenic bacterium. Previously it was shown that TEG up-regulated gtfB, an important gene contributing to polysaccharide synthesis function in biofilms. However, molecular mechanisms related to TEG's effect on bacterial function remained poorly understood...
2016: PloS One
https://www.readbyqxmd.com/read/27818788/effect-of-oral-fluids-on-dental-caries-detection-by-the-vistacam
#18
Fardad Shakibaie, Laurence J Walsh
The VistaCam® system (Durr Dental, Bietigheim-Bissingen, Germany) has been suggested as an adjunct to clinical examination for dental caries. This study assessed whether the digital scores obtained for tooth surfaces were affected by the colour of the carious lesions present and by the presence of saliva or blood on the tooth surface. The VistaCam intra-oral ries, or with sound enamel and root surfaces, with or without overlying dental plaque biofilm. Teeth that had undergone root treatment or were stained by tetracycline were also assessed...
December 2015: Clinical and Experimental Dental Research
https://www.readbyqxmd.com/read/27809278/assessment-of-photodynamic-inactivation-against-periodontal-bacteria-mediated-by-a-chitosan-hydrogel-in-a-3d-gingival-model
#19
Po-Chun Peng, Chien-Ming Hsieh, Chueh-Pin Chen, Tsuimin Tsai, Chin-Tin Chen
Chitosan hydrogels containing hydroxypropyl methylcellulose (HPMC) and toluidine blue O were prepared and assessed for their mucoadhesive property and antimicrobial efficacy of photodynamic inactivation (PDI). Increased HPMC content in the hydrogels resulted in increased mucoadhesiveness. Furthermore, we developed a simple In Vitro 3D gingival model resembling the oral periodontal pocket to culture the biofilms of Staphylococcus aureus (S. aureus), Aggregatibacter actinomycetemcomitans (A. actinomycetemcomitans), and Porphyromonas gingivalis (P...
November 1, 2016: International Journal of Molecular Sciences
https://www.readbyqxmd.com/read/27794150/periodontal-and-microbiological-profile-of-intensive-care-unit-inpatients
#20
Alessandra N Porto, Alvaro H Borges, Grace Rocatto, Fernanda Z Matos, Alexandre M Borba, F L Miranda Pedro, Suellen L Lima, Mateus R Tonetto, Matheus C Bandéca, A M Fabio Aranha
INTRODUCTION: The bidirectional relationship between the periodontal diseases and systemic diseases was attributed to the focal infection concept. The aims of this study were to assess the periodontal and microbiological profile of intensive care unit (ICU) inpatients submitted to orotracheal intubation, and classify them regarding gender, age group, ethnic, hospitalization reason and period, nosocomial infection occurrence, and death. MATERIALS AND METHODS: Inpatients were assessed, distributed into toothed and toothless groups...
October 1, 2016: Journal of Contemporary Dental Practice
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