scholarly journals Competitive advantage of oral streptococci for colonization of the middle ear mucosa

2021 ◽  
Author(s):  
Kristin M Jacob ◽  
Gemma Reguera
Keyword(s):  
Middle Ear ◽  
Phylogenetic Analyses ◽  
Oral Streptococci ◽  
Middle Ear Mucosa ◽  
Metabolic Intermediate ◽  
Swarming Motility ◽  
Surfactant Production ◽  
Selective Forces ◽  
Efficient Fermentation ◽  
Trophic Webs

The intermittent aeration of the middle ear seeds its mucosa with saliva aerosols and selects for a distinct community of commensals adapted to the otic microenvironment. We gained insights into the selective forces that enrich for specific groups of oral migrants in the middle ear mucosa by investigating the phylogeny and physiology of 19 strains enriched (Streptococcus) or transiently present (Staphylococcus, Neisseria and actinobacterial Micrococcus and Corynebacterium) in otic secretions. Phylogenetic analyses of full length 16S rRNA sequences resolved close relationships between the streptococcal strains and oral commensals as well as between the transient migrants and known nasal and oral species. Physiological functions that facilitate mucosal colonization (swarming motility, surfactant production) and nutrition (mucin and protein degradation) were widespread in all the otic cultivars, as was the ability of most of the isolates to grow both aerobically and anaerobically. However, streptococci stood out for their enhanced biofilm-forming abilities under oxic and anoxic conditions and for their efficient fermentation of mucosal substrates into lactate, a key metabolic intermediate in the otic trophic webs. Additionally, the otic streptococci inhibited the growth of common otopathogens, an antagonistic interaction that could exclude competitors and protect the middle ear mucosa from infections by transient pathobionts. These adaptive traits allow streptococcal migrants to colonize the otic mucosa and grow microcolonies with syntrophic anaerobic partners, establishing trophic webs with other commensals similar to those formed by the oral ancestors in buccal biofilms.

Are mucin genes yet to be cloned expressed by human middle ear mucosa?

1998 ◽  
Vol 23 (3) ◽  
pp. 265-265 ◽  
Author(s):  
Hutton ◽  
Birchall ◽  
French ◽  
Kubba ◽  
Severn ◽  
...  
Keyword(s):  
Middle Ear ◽  
Middle Ear Mucosa ◽  
Mucin Genes ◽  
Human Middle Ear

scholarly journals Immunohistochemical and qPCR Detection of SARS-CoV-2 in the Human Middle Ear Versus the Nasal Cavity: Case Series

2021 ◽  
Author(s):  
Arwa Kurabi ◽  
Kwang Pak ◽  
Adam S. DeConde ◽  
Allen F. Ryan ◽  
Carol H. Yan
Keyword(s):  
Nasal Cavity ◽  
Middle Ear ◽  
Viral Infections ◽  
Case Series ◽  
Middle Ear Mucosa ◽  
Viral Receptor ◽  
Tissue Samples ◽  
Angiotensin Converting Enzyme 2 ◽  
Nasal Tissue ◽  
Human Middle Ear

AbstractViral infections have already been implicated with otitis media and sudden sensorineural hearing loss. However, the pathophysiology of COVID-19 as it relates to otologic disorders is not well-defined. With the spread of SARS-CoV-2, it is important to evaluate its colonization of middle ear mucosa. Middle ear and nasal tissue samples for quantitative RT-PCR and histologic evaluations were obtained from post-mortem COVID-19 patients and non-diseased control patients. Here we present evidence that SARS-CoV-2 colonizes the middle ear epithelium and co-localizes with the primary viral receptor, angiotensin-converting enzyme 2 (ACE2). Both middle ear and nasal epithelial cells show relatively high expression of ACE2, required for SARS-CoV-2 entry. The epithelial cell adhesion molecule (EpCAM) was use as a biomarker of epithelia. Furthermore, we found that the viral load in the middle ear is lower than that present in the nasal cavity.

Atypical Pharyngitis In Suppurative Otitis Media Cases

2008 ◽  
Vol 139 (2_suppl) ◽  
pp. P98-P99
Author(s):  
Alaa A Abou-Bieh ◽  
Mona F Salama
Keyword(s):  
Middle Ear ◽  
Causative Organism ◽  
Isolation And Identification ◽  
Middle Ear Mucosa ◽  
Suppurative Otitis Media ◽  
Gram Negative ◽  
Middle Ear Infection ◽  
Gram Negative Organisms ◽  
Micro Organisms ◽  
Middle Ear Cleft

Problem Unexplained persistent or recurrent bacterial pharyngitis in some patients who suffer from infected middle ear cleft. Methods Bacteriological swabs were obtained from both the ears and the pharynx of 37 cases with chronic otorrhea and perforation, whom complain of recurrent or persistent sore-throat. Then isolation and identification of the micro-organisms were done. This included examination of direct Gram stained films and cultures. Isolated Gram negative bacilli were subjected to further identification by the biochemical reactions and antibiotyping. Identical isolates from the same patient (ear and pharyngeal swabs) were subjected to further identification by genotyping using the pulsed field gel electrophoresis technique. Results 6 cases (16%) showed identity in phenotypes and genotypes for ear and pharyngeal samples from the same patient. All pharyngeal isolates were Gram negative organisms. 4 of them were Pseudomonas aeruginosa, 1 was Proteus sp., and 1 was Escherichia coli. All of these 3 species are not known to be among the primary organisms which may cause pharyngitis. Conclusion Bacterial pharyngitis in patients with chronically infected middle ear cleft may be attributed to the same organism invaded the middle ear mucosa. Also this study highlights some organisms as a pharyngeal invaders although they are not among the previously documented causatives of bacterial pharyngitis. But the study do not confirm the method of spread of these organisms and whether this was directly via the eustachian tube. Significance The study correlates the causative organism of the middle ear infection and that infected the pharyngeal mucosa utilizing the advanced bacteriological identification and genotyping techniques.

Histochemical Characteristics of Normal Middle Ear Mucosa

1972 ◽  
Vol 74 (1-6) ◽  
pp. 45-56 ◽  
Author(s):  
F. Hiraide ◽  
M. M. Paparella
Keyword(s):  
Middle Ear ◽  
Middle Ear Mucosa

Neural Control of the Middle Ear Mucosa

1988 ◽  
Vol 105 (sup457) ◽  
pp. 159-163
Author(s):  
Jukka Ylikoski ◽  
Igor Mrena ◽  
Pertti Panula ◽  
Olli Häppölä ◽  
Heikki Päivärinta
Keyword(s):  
Middle Ear ◽  
Neural Control ◽  
Middle Ear Mucosa

scholarly journals Novel High-Throughput Detection Method To Assess Bacterial Surfactant Production

2010 ◽  
Vol 76 (16) ◽  
pp. 5363-5372 ◽  
Author(s):  
Adrien Y. Burch ◽  
Briana K. Shimada ◽  
Patrick J. Browne ◽  
Steven E. Lindow
Keyword(s):  
Pseudomonas Syringae ◽  
High Throughput ◽  
Water Drop ◽  
Bacterial Strains ◽  
Swarming Motility ◽  
Detection Assay ◽  
Wide Range ◽  
Surfactant Production ◽  
Transposon Mutants ◽  
High Throughput Detection

ABSTRACT A novel biosurfactant detection assay was developed for the observation of surfactants on agar plates. By using an airbrush to apply a fine mist of oil droplets, surfactants can be observed instantaneously as halos around biosurfactant-producing colonies. This atomized oil assay can detect a wide range of different synthetic and bacterially produced surfactants. This method could detect much lower concentrations of many surfactants than a commonly used water drop collapse method. It is semiquantitative and therefore has broad applicability for uses such as high-throughput mutagenesis screens of biosurfactant-producing bacterial strains. The atomized oil assay was used to screen for mutants of the plant pathogen Pseudomonas syringae pv. syringae B728a that were altered in the production of biosurfactants. Transposon mutants displaying significantly altered surfactant halos were identified and further analyzed. All mutants identified displayed altered swarming motility, as would be expected of surfactant mutants. Additionally, measurements of the transcription of the syringafactin biosynthetic cluster in the mutants, the principal biosurfactant known to be produced by B728a, revealed novel regulators of this pathway.

scholarly journals A child’s mysterious ear

2021 ◽  
Vol 7 (9) ◽  
pp. 1555
Author(s):  
Preeti Shetti ◽  
Shivani Gupta ◽  
Paramita Debnath
Keyword(s):  
Foreign Body ◽  
Middle Ear ◽  
External Auditory Canal ◽  
Pediatric Patients ◽  
Middle Ear Mucosa ◽  
Polypoidal Mass

<p>Foreign body in ear is an emergency encountered by an otolaryngologist and if not removed it can lead to serious complications. Most commonly foreign body in ear is lodged in external auditory canal while it’s rare to find it in middle ear. We report a case of foreign body in the middle ear in a 3-year-old child who presented to us with chronic discharging ear who was then suspected to be unsafe ear and so was taken up for exploration under microscope. A pink polypoidal mass arising from middle ear mucosa was found and following its removal- to our surprise; a blackish rubbery debris filling the middle ear cavity and attic area along with embedded foreign body was extracted. We conclude that pediatric patients with chronic ear discharge not responding to antibiotics should raise a suspicion of FB in the middle ear and explored timely.</p>

scholarly journals Transcanal Endoscopic Antrostomy Hole : Its Utility in Restoring Ventilation Pathway to Epitympanum and Mastoid Antrum During Tympanoplasty

2014 ◽  
Vol 2 (1) ◽  
pp. 9-14
Author(s):  
Sheikh Shawkat Kamal
Keyword(s):  
Middle Ear ◽  
Tertiary Care ◽  
Case Series ◽  
Care Hospital ◽  
Retrospective Case ◽  
Middle Ear Mucosa ◽  
Case Series Study ◽  
Temporal Bones ◽  
Mastoid Antrum

Aim: To evaluate the role of newly created transcanal endoscopic antrostomy hole as a passage in restoring the aeration of epitympanum and mastoid antrum.Materials & Methods: Study design: Retrospective case series study. Study duration: From January 2013 to January 2014. Study place: Private tertiary care hospital. Patients: 27  ears of 23 adult patients (age ranging from 15years to 54years) underwent transcanal endoscopic tympanoplasty for their chronic middle ear diseases in presence of inflamed middle ear mucosa along with radiological shadows of stagnant fluid in their epitympanum and mastoid antrum. Structured three months follow-up was ensured in every case. Intervention: A hole was created at a selected site of posterior meatal wall purely through transcanal endoscopic approach that established direct communication between mastoid antrum and external auditory canal. Thereafter this newly created passage was used for three purposes- assessment of the condition of mastoid antrum, performing the water test for checking epitympanic patency and in few cases placement of temporary tube for postoperative ventilation and drainage of middle ear. Main out come measures: The feasibility, performance and management of transcanal endoscopic antrostomy hole as passage for reestablishing the aeration of epitympanum and mastoid antrum.Results: The chosen site for antrostomy hole was found effective and safe in providing convenient entrance into the mastoid antrum in every case in this study with out facing technical complexity and failure. Postoperative healing of skin over antrostomy hole was found complete in all ears without any inward growth of skin in to mastoid antrum. Available post operative CT scan imaging of temporal bones showed improved aeration in their epitympanum and mastoid antrum.Conclusions: The role of transcanal antrostomy hole has been proved worthy in restoring ventilation pathway to epitympanum and mastoid antrum during tympanoplasty. This antrostomy hole has the potentiality to be considered in future for placement of long term mastoid ventilation tube in order to treat persistent atelectatic middle ear.

Effects of Platelet Activating Factor on the Tubotympanic Mucosa and Inner Ear in the Guinea Pig

1998 ◽  
Vol 107 (10) ◽  
pp. 876-884 ◽  
Author(s):  
Yoshiharu Ohno ◽  
Yoshihiro Ohashi ◽  
Hideki Okamoto ◽  
Yoshikazu Sugiura ◽  
Yoshiaki Nakai
Keyword(s):  
Hearing Loss ◽  
Sensorineural Hearing Loss ◽  
Inner Ear ◽  
Otitis Media ◽  
Middle Ear ◽  
Otitis Media With Effusion ◽  
Platelet Activating Factor ◽  
Sensorineural Hearing ◽  
Ciliary Activity ◽  
Middle Ear Mucosa

The effect of platelet activating factor (PAF) was studied to elucidate its role in the pathogenesis of otitis media and sensorineural hearing loss. The PAF alone did not induce a reduction of ciliary activity of the cultured middle ear mucosa. However, a dose-dependent decrease in ciliary activity was observed in the presence of the medium containing both PAF and macrophages. Intravenous injection of PAF did not induce dysfunction of the mucociliary system or morphologic changes of epithelium in the tubotympanum, but cytoplasmic vacuolization and ballooning were observed in the inner ear within 1 hour after injection of PAF. In contrast, intratympanic injection of PAF induced mucociliary dysfunction and some pathologic changes in the tubotympanum. Intratympanic inoculation of PAF induced no pathologic findings in the inner ear. These results suggest that PAF is at least partially involved in the pathogenesis of certain middle ear diseases such as otitis media with effusion. Additionally, PAF might be involved in the pathogenesis of some types of unexplained sensorineural hearing loss.

scholarly journals Gas Exchange Function of the Middle Ear Mucosa in Patients with Cleft Palate.

1998 ◽  
Vol 91 (3) ◽  
pp. 227-231
Author(s):  
Makito TANABE ◽  
Haruo Takahashi ◽  
Iwao HONJI ◽  
Masaki SAWADA
Keyword(s):  
Gas Exchange ◽  
Cleft Palate ◽  
Middle Ear ◽  
Middle Ear Mucosa ◽  
Exchange Function
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