Microbial and Host Factors That Affect Bacterial Invasion of the Gingiva

2020 ◽  
Vol 99 (9) ◽  
pp. 1013-1020
Author(s):  
S. Ji ◽  
Y. Choi
Keyword(s):  
Chronic Inflammation ◽  
Bacterial Species ◽  
Host Factors ◽  
Gingival Tissue ◽  
Current Evidence ◽  
Bacterial Invasion ◽  
Gingival Epithelium ◽  
Genetic And Environmental Factors ◽  
Systemic Infections ◽  
Review Current

Periodontitis is a chronic inflammation of the periodontium caused by the loss of homeostasis between subgingival biofilms and susceptible hosts. Bacterial invasion into the gingival tissue and persistent infection are major events that lead to chronic inflammation. The intratissue bacterial communities are as complex as the subgingival biofilms and can also form biofilm-like structures, which will serve as a reservoir for local and systemic infections. The epithelium forms physical, chemical, and immunological barriers against invading microbes. Nevertheless, many bacterial species can invade the gingival epithelium through transcellular and paracellular pathways. In addition, both genetic and environmental factors of the hosts can affect epithelial barrier functions and thus bacterial invasion of the gingiva. In this review, current evidence for the bacterial invasion of the gingival tissue in periodontitis has been summarized, and the microbial and host factors that determine bacterial invasion of the gingiva have been reviewed.

Across The “Sweetiest” Properties Of Human Breast Milk: Focus On Oligosaccharides

2020 ◽  
Vol 16 ◽  
Author(s):  
Flaminia Bardanzellu ◽  
Alessandra Reali ◽  
Maria Antonietta Marcialis ◽  
Vassilios Fanos
Keyword(s):  
Breast Milk ◽  
Active Role ◽  
Individual Variability ◽  
Human Breast Milk ◽  
Formula Milk ◽  
Target Organs ◽  
Lactating Mothers ◽  
Neonatal Nutrition ◽  
Genetic And Environmental Factors ◽  
Systemic Infections

Introduction: Breast Milk (BM), containing nutrients and bioactive components, represents the best source for neonatal nutrition and determines short- and long- term benefits. Human milk oligosaccharides (HMOs) play an active role in these pathophysiological mechanisms. In fact; they influence the shaping of breastfed infant’s gut microbiota, promote intestinal development, confer protection against intestinal or systemic infections modulating immune system; moreover, HMOs determine extra-intestinal effects on several target organs, i.e reducing necrotizing enterocolitis rate or improving brain development. Aims: In this review, we analyze the great inter- and intra-individual variability of BM HMOs, investigating maternal, genetic and environmental factors modulating their composition. Moreover, we provide an update regarding HMOs’ unique properties, underlining their complex interaction with intestinal microbiota and host-derived metabolites. The possible HMOs’ influence on extra-intestinal bacterial communities, potentially influencing newborns’ and even lactating mothers’ health, have been hypothesized. Finally, recognized HMOs’ crucial role, we underline the promising opportunities showed by their addition in formula milk, useful to create dairy products more similar to maternal milk itself.

scholarly journals Antimicrobial Activity of Non-steroidal Anti-inflammatory Drugs on Biofilm: Current Evidence and Potential for Drug Repurposing

2021 ◽  
Vol 12 ◽  
Author(s):  
Rodrigo Cuiabano Paes Leme ◽  
Raquel Bandeira da Silva
Keyword(s):  
Bacterial Species ◽  
Drug Repurposing ◽  
Current Evidence ◽  
Pharmacokinetic Studies ◽  
Bacterial Populations ◽  
Human Pharmacokinetic ◽  
Inflammatory Drugs ◽  
Anti Inflammatory

It has been demonstrated that some non-steroidal anti-inflammatory drugs (NSAIDs), like acetylsalicylic acid, diclofenac, and ibuprofen, have anti-biofilm activity in concentrations found in human pharmacokinetic studies, which could fuel an interest in repurposing these well tolerated drugs as adjunctive therapies for biofilm-related infections. Here we sought to review the currently available data on the anti-biofilm activity of NSAIDs and its relevance in a clinical context. We performed a systematic literature review to identify the most commonly tested NSAIDs drugs in the last 5 years, the bacterial species that have demonstrated to be responsive to their actions, and the emergence of resistance to these molecules. We found that most studies investigating NSAIDs’ activity against biofilms were in vitro, and frequently tested non-clinical bacterial isolates, which may not adequately represent the bacterial populations that cause clinically-relevant biofilm-related infections. Furthermore, studies concerning NSAIDs and antibiotic resistance are scarce, with divergent outcomes. Although the potential to use NSAIDs to control biofilm-related infections seems to be an exciting avenue, there is a paucity of studies that tested these drugs using appropriate in vivo models of biofilm infections or in controlled human clinical trials to support their repurposing as anti-biofilm agents.

scholarly journals Innate Immune Response as a New Challenge in Periodontal Inflammation

2021 ◽  
Author(s):  
Ana Marina Andrei ◽  
Elena Cristina Andrei ◽  
Elena Camelia Stănciulescu ◽  
Mihaela Cezarina Mehedinți ◽  
Mihaela Jana Țuculină ◽  
...  
Keyword(s):  
Immune Response ◽  
Innate Immune Response ◽  
Periodontal Diseases ◽  
Bacterial Species ◽  
Innate Immune ◽  
Beneficial Effects ◽  
Periodontal Tissues ◽  
Periodontal Inflammation ◽  
Genetic And Environmental Factors ◽  
Tlr Signalling

Gingivitis and periodontitis are induced by numerous pathogenic microbiota hosted in the subgingival biofilm that first trigger the innate immune response. Innate immune response is part of a homeostatic system which is the first line defence and defines the host inherited resistance to infection. Both genetic and environmental factors are involved in variable individual susceptibility to inflammation of periodontal tissues. That is why, although more than 600 bacterial species have been detected in the periodontal plaque, the type of bacteria incriminated in the development of the inflammation is still unclear. Moreover, in the last decade gene polymorphisms have been largely recognised as important conditions associated with increased susceptibility to periodontal diseases. Manipulating the immune response by the development of drugs that inhibit adverse host reactions and promote beneficial effects might be of therapeutic or prophylactic importance. This work intends to assess the importance of Toll-like receptors as main effectors of the innate immune response in the triggering, maintenance and progression of periodontal inflammation, as well as of the involvement of synthetic molecules targeting TLR signalling pathways in treating periodontal diseases.

scholarly journals Safety Assessment of Nano-Hydroxyapatite as an Oral Care Ingredient according to the EU Cosmetics Regulation

Cosmetics ◽  
2018 ◽  
Vol 5 (3) ◽  
pp. 53 ◽  
Author(s):  
Joana Ramis ◽  
Catarina Coelho ◽  
Alba Córdoba ◽  
Paulo Quadros ◽  
Marta Monjo
Keyword(s):  
Oral Care ◽  
Gastric Fluid ◽  
Gingival Tissue ◽  
Simulated Gastric Fluid ◽  
Tem Analysis ◽  
Consumer Safety ◽  
Transmission Electron ◽  
Dissolution Behaviour ◽  
Gingival Epithelium

Hydroxyapatite nanoparticles (HAP-NP) are incorporated in oral care products such as toothpastes and mouthwashes to treat dental sensitivity or to promote enamel remineralisation. Despite the good performance of HAP-NP in this application, it is important to ensure its safety for consumers. For that reason, the Scientific Committee on Consumer Safety (SCCS) evaluated the safety of HAP-NP as an oral care ingredient, but the issued opinion was not completely conclusive and the SCCS recommended that additional tests should be performed. Here, we used a commercially available human gingival epithelium (HGE) as a non-animal alternative and MTT cell viability, LDH activity, and IL-1alpha production were evaluated after 3.1% HAP-NP treatment for 10 min, 1 h, and 3 h. Moreover, the absorption of HAP-NP in the gingival tissue was assessed by transmission electron microscopy (TEM) analysis. Finally, the dissolution behaviour of HAP-NP in simulated gastric fluid was also investigated. No deleterious effect was observed for HGE tissues incubated with HAP-NP for all time-points and parameters evaluated. Moreover, a complete dissolution of 3.1% HAP-NP in simulated gastric fluid was observed after 7.5 min at 37 °C. In conclusion, our results evidence the safety of HAP-NP for oral care products with the use of an in vitro replacement alternative for human gingival epithelium and a simulated gastric fluid assay.

Neurobiology and Treatment of OCD

2013 ◽  
pp. 646-661
Author(s):  
Susanne E. Ahmari ◽  
H. Blair Simpson
Keyword(s):  
Environmental Factors ◽  
Behavioral Therapy ◽  
Treatment Strategies ◽  
Current Evidence ◽  
Evidence Based ◽  
Preclinical Studies ◽  
Obsessive Compulsive ◽  
Compulsive Disorder ◽  
Evidence Based Treatments ◽  
Genetic And Environmental Factors

Obsessive Compulsive Disorder (OCD) is a chronic, disabling disorder with a lifetime prevalence of up to 2-3%, and is a leading cause of illness-related disability. OCD is characterized by recurrent intrusive thoughts, images, or impulses (obsessions) that cause anxiety or distress, and repetitive mental or behavioral acts (compulsions). Though the etiology of OCD is unclear, current evidence implicates both genetic and environmental factors in its development. Our understanding of the neurobiology underlying OCD is still evolving, with convergent evidence from clinical and preclinical studies highlighting the importance of abnormalities in cortico-striatal-thalamo-cortical (CSTC) circuits. Evidence-based treatments for OCD include both pharmacotherapy and cognitive-behavioral therapy. This chapter will review the etiology and neurobiology of OCD, and will provide an overview of treatment strategies.

The nuclear lamina and heterochromatin: a complex relationship

2011 ◽  
Vol 39 (6) ◽  
pp. 1705-1709 ◽  
Author(s):  
Erin M. Bank ◽  
Yosef Gruenbaum
Keyword(s):  
Nuclear Periphery ◽  
Gene Activation ◽  
Nuclear Lamina ◽  
Current Evidence ◽  
Specific Gene ◽  
Nuclear Interior ◽  
Gene Retention ◽  
Gene Positioning ◽  
Review Current ◽  
Active Genes

In metazoan cells, the heterochromatin is generally localized at the nuclear periphery, whereas active genes are preferentially found in the nuclear interior. In the present paper, we review current evidence showing that components of the nuclear lamina interact directly with heterochromatin, which implicates the nuclear lamina in a mechanism of specific gene retention at the nuclear periphery and release to the nuclear interior upon gene activation. We also discuss recent data showing that mutations in lamin proteins affect gene positioning and expression, providing a potential mechanism for how these mutations lead to tissue-specific diseases.

scholarly journals Tracheal Cuff Pressure Monitoring in the ICU: A Literature Review and Survey of Current Practice in Queensland

2014 ◽  
Vol 42 (6) ◽  
pp. 761-770 ◽  
Author(s):  
C. R. Talekar ◽  
A. A. Udy ◽  
R. J. Boots ◽  
J. Lipman ◽  
D. Cook
Keyword(s):  
Cuff Pressure ◽  
Current Evidence ◽  
Current Guideline ◽  
Pressure Monitoring ◽  
Public And Private ◽  
Monitoring Devices ◽  
O 10 ◽  
Representative Member ◽  
Review Current ◽  
Tracheal Cuff

The application of tracheal cuff pressure monitoring is likely to vary between institutions. The aim of this study was therefore to review current evidence concerning this intervention in the intensive care unit (ICU) and to appraise regional practice by performing a state-wide survey. Publications for review were identified through searches of PubMed, EMBASE and Cochrane (1977 to 2014). All studies in English relevant to critical care and with complete data were included. Survey questions were developed by small-group consensus. Public and private ICUs across Queensland were contacted, with responses obtained from a representative member of the medical or nursing staff. Existing literature suggests significant variability in tracheal cuff pressure monitoring in the ICU, particularly in the applied technique, frequency of assessment and optimal intra-cuff pressures. Twenty-nine respondents completed the survey, representing 80.5% (29/36) of ICUs in Queensland. Twenty-eight out of twenty-nine respondents reported routinely monitoring tracheal cuff function, primarily employing cuff pressure measurement (26/28). Target cuff pressures varied, with 3/26 respondents aiming for 10 to 20 cmH2O, 10/26 for 21 to 25 cmH2O, and 13/26 for 26 to 30 cmH2O. Fifteen out of twenty-nine reported they had no current guideline or protocol for tracheal cuff management and only 16/29 indicated there was a dedicated area in the clinical record for reporting cuff intervention. Our results indicate that many ICUs across Queensland routinely measure tracheal cuff function, with most utilising pressure monitoring devices. Consistent with existing literature, the optimum cuff pressure remains uncertain. Most, however, considered that this should be a routine part of ICU care.

scholarly journals Maintenance pharmacotherapy of unipolar depression

1999 ◽  
Vol 23 (6) ◽  
pp. 370-373 ◽  
Author(s):  
Som Forshall ◽  
David J. Nutt
Keyword(s):  
Prophylactic Treatment ◽  
Unipolar Depression ◽  
Term Treatment ◽  
Current Evidence ◽  
Full Remission ◽  
Long Term Treatment ◽  
Continuation Treatment ◽  
Term Maintenance ◽  
Review Current

Aims and methodsThe purpose of this paper is to review current evidence and opinion with regard to the long-term treatment of unipolar depression. The method employed was a Psychlit search using the search items long-term, maintenance, treatment and depression.ResultsThe search yielded 91 articles.Clinical implicationsUnipolar depression is frequently recurrent and sometimes a chronic illness. The paper identifies those at greatest risk of recurrence. It goes on to examine strategies to prevent relapse and for prophylactic treatment. It concludes that continuation treatment should be sustained at full dose for 4–6 months after full remission of symptoms. Where depression is highly recurrent the acute phase dose should be maintained in the long-term.

The Bactericidal/Permeability-Increasing Protein (BPI) Is Present in Specific Granules of Human Eosinophils

Blood ◽  
1998 ◽  
Vol 91 (12) ◽  
pp. 4770-4775 ◽  
Author(s):  
Jero Calafat ◽  
Hans Janssen ◽  
Anton Tool ◽  
Mieke A. Dentener ◽  
Edward F. Knol ◽  
...  
Keyword(s):  
Host Defense ◽  
Bacterial Species ◽  
Enzyme Linked Immunosorbent Assay ◽  
Bacterial Invasion ◽  
Parasitic Infestation ◽  
Specific Enzyme ◽  
Gram Negative ◽  
Bactericidal Effects ◽  
Specific Granules ◽  
Blot Technique

Eosinophils participate in the inflammatory response seen in allergy and parasitic infestation, but a role in host defense against bacterial infection is not settled. The bactericidal/permeability-increasing protein (BPI) has been demonstrated in neutrophils and it exerts bacteriostatic and bactericidal effects against a wide variety of Gram-negative bacterial species. Using the Western blot technique, a 55-kD band, corresponding to BPI, was detected in lysates from both neutrophils and eosinophils. The localization of BPI in immature and mature eosinophils was investigated using immunoelectron microscopy. BPI was found in immature and mature specific granules of eosinophils and was detected in phagosomes as well, indicating release of the protein from the granules into the phagosomes. Using a specific enzyme-linked immunosorbent assay, eosinophils were shown to contain 179 ng of BPI/5 × 106 eosinophils compared with 710 ng BPI/5 × 106 neutrophils. The presence of BPI in eosinophils suggests a role for these cells in host defense against Gram-negative bacterial invasion or may suggest a role for BPI against parasitic infestation.

scholarly journals Management of Retained Genital Piercings: A Case Report and Review

2017 ◽  
Vol 2017 ◽  
pp. 1-3
Author(s):  
Laura J. Moulton ◽  
Amelia M. Jernigan
Keyword(s):  
Emergency Department ◽  
Case Report ◽  
Blood Supply ◽  
Local Anesthetic ◽  
Simple Technique ◽  
Current Evidence ◽  
Vertical Incision ◽  
Clitoral Hood ◽  
Review Current ◽  
Female Genital

The prevalence of genital piercing among women is increasing. As the popularity increases, the number of complications from infection, injury, and retained jewelry is likely to rise. Techniques to remove embedded jewelry are not well described in the literature. The purpose of this report was to describe a case of a patient with a retained clitoral glans piercing, discuss a simple technique for outpatient removal, and review current evidence regarding associated risks of clitoral piercings. A 24-year-old female presented to the emergency department with an embedded clitoral glans piercing. Local anesthetic was injected into the periclitoral skin and a small superficial vertical incision was made to remove the ball of the retained barbell safely. In conclusion, among patients with retained genital piercing, outpatient removal of embedded jewelry is feasible. While the practice of female genital piercing is not regulated, piercing of the glans of the clitoris is associated with increased injury to the nerves and blood supply of the clitoris structures leading to future fibrosis and diminished function compared to piercing of the clitoral hood.

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