scholarly journals Inflammatory Cell Infiltration of Adrenals in COVID-19

2020 ◽  
Vol 52 (09) ◽  
pp. 639-641 ◽  
Author(s):  
Vsevolod A. Zinserling ◽  
Natalya Yu. Semenova ◽  
Alexander G. Markov ◽  
Oksana V. Rybalchenko ◽  
Jun Wang ◽  
...  
Keyword(s):  
Inflammatory Cell ◽  
Adrenal Glands ◽  
Virus Entry ◽  
Upper Respiratory Tract ◽  
Angiotensin Converting Enzyme 2 ◽  
Cd8 T Lymphocytes ◽  
The World ◽  
Upper Respiratory ◽  
Perivascular Infiltration

AbstractSevere acute respiratory syndrome coronavirus 2 (SARS-CoV-2) was originated in November–December 2019 in Wuhan, China, and has rapidly spread around the world causing severe health and socioeconomical damage to the entire civilization. The key feature of coronavirus disease 2019 (COVID-19), caused by SARS-CoV-2, is upper respiratory tract infection, which may be complicated by bilateral pneumonia. Angiotensin converting enzyme 2 (ACE2) has been identified as a key host factor, required for virus entry into cells. Interestingly, ACE2 is expressed not only in the respiratory system, but also in the other organs and systems including adrenal glands. Here we provide the first description of the pathomorphological changes in adrenal glands in patients with severe COVID-19 characterized by perivascular infiltration of CD3+ and CD8+ T-lymphocytes. Due to the central role of the adrenals in the stress response of the organism, this finding is of potential clinical relevance, because infection with the SARS-CoV-2 virus might critically impair adrenal function under pathophysiological conditions.

scholarly journals The Contrasting Role of Nasopharyngeal Angiotensin Converting Enzyme 2 (ACE2) Expression in SARS-CoV-2 Infection: A Cross-Sectional Study of People Tested for COVID-19 in British Columbia

2020 ◽  
Author(s):  
Aidan M. Nikiforuk ◽  
Kevin S. Kuchinski ◽  
David D.W. Twa ◽  
Christine D. Lukac ◽  
Hind Sbihi ◽  
...  
Keyword(s):  
British Columbia ◽  
Cross Sectional Study ◽  
Viral Rna ◽  
Bivariate Analysis ◽  
Upper Respiratory Tract ◽  
Cross Sectional ◽  
Angiotensin Converting Enzyme 2 ◽  
Biological Sex ◽  
Upper Respiratory

SummaryBackgroundAngiotensin converting enzyme 2 (ACE2) serves as the host receptor for SARS-CoV-2, with a critical role in viral infection. We aim to understand population level variation of nasopharyngeal ACE2 expression in people tested for COVID-19 and the relationship between ACE2 expression and SARS-CoV-2 viral RNA load, while adjusting for expression of the complementary protease, Transmembrane serine protease 2 (TMPRSS2), soluble ACE2, age, and biological sex.MethodsA cross-sectional study of n=424 participants aged 1-104 years referred for COVID-19 testing was performed in British Columbia, Canada. Participants who tested negative or positive for COVID-19 were matched by age and biological sex. Viral and host gene expression was measured by quantitative reverse-transcriptase polymerase chain reaction. Bivariate analysis and multiple linear regression were performed to understand the role of nasopharyngeal ACE2 expression in SARS-CoV-2 infection. The ACE2 gene was targeted to measure expression of transmembrane and soluble transcripts.FindingsAnalysis shows no association between age and nasopharyngeal ACE2 expression in those who tested negative for COVID-19 (P=0·092). Mean expression of transmembrane (P=1·2e-4), soluble ACE2 (P<0·0001) and TMPRSS2 (P<0·0001) differed between COVID-19-negative and -positive groups. In bivariate analysis of COVID-19-positive participants, expression of transmembrane ACE2 positively correlated with SARS-CoV-2 RNA viral load (P<0·0001), expression of soluble ACE2 negatively correlated (P<0·0001), and no correlation was found with TMPRSS2 (P=0·694). Multivariable analysis showed that the greatest viral RNA loads were observed in participants with high transmembrane ACE2 expression (B=0·886, 95%CI:[0·596 to 1·18]), while expression of soluble ACE2 may protect against high viral RNA load in the upper respiratory tract (B= −0·0990, 95%CI:[−0·176 to −0·0224]).InterpretationNasopharyngeal ACE2 expression plays a dual, contrasting role in SARS-CoV-2 infection of the upper respiratory tract. Transmembrane ACE2 positively correlates, while soluble ACE2 negatively correlates with viral RNA load after adjusting for age, biological sex and expression of TMPRSS2.FundingThis project (COV-55) was funded by Genome British Columbia as part of their COVID-19 rapid response initiative.

scholarly journals Toll-Like Receptors: Expression and Roles in Otitis Media

2021 ◽  
Vol 22 (15) ◽  
pp. 7868
Author(s):  
Su Young Jung ◽  
Dokyoung Kim ◽  
Dong Choon Park ◽  
Sung Soo Kim ◽  
Tong In Oh ◽  
...  
Keyword(s):  
Tract Infection ◽  
Respiratory Tract ◽  
Respiratory Tract Infection ◽  
Otitis Media ◽  
Middle Ear ◽  
Upper Respiratory Tract Infection ◽  
Upper Respiratory Tract ◽  
Toll Like Receptors ◽  
Upper Respiratory

Otitis media is mainly caused by upper respiratory tract infection and eustachian tube dysfunction. If external upper respiratory tract infection is not detected early in the middle ear, or an appropriate immune response does not occur, otitis media can become a chronic state or complications may occur. Therefore, given the important role of Toll-like receptors (TLRs) in the early response to external antigens, we surveyed the role of TLRs in otitis media. To summarize the role of TLR in otitis media, we reviewed articles on the expression of TLRs in acute otitis media (AOM), otitis media with effusion (OME), chronic otitis media (COM) with cholesteatoma, and COM without cholesteatoma. Many studies showed that TLRs 1–10 are expressed in AOM, OME, COM with cholesteatoma, and COM without cholesteatoma. TLR expression in the normal middle ear mucosa is absent or weak, but is increased in inflammatory fluid of AOM, effusion of OME, and granulation tissue and cholesteatoma of COM. In addition, TLRs show increased or decreased expression depending on the presence or absence of bacteria, recurrence of disease, tissue type, and repeated surgery. In conclusion, expression of TLRs is associated with otitis media. Inappropriate TLR expression, or delayed or absent induction, are associated with the occurrence, recurrence, chronicization, and complications of otitis media. Therefore, TLRs are very important in otitis media and closely related to its etiology.

scholarly journals A role of oropharyngeal microbiota in developing acute and chronic diseases of the upper respiratory tract

2020 ◽  
Vol 10 (2) ◽  
pp. 359-367
Author(s):  
I. I. Ababii ◽  
L. A. Danilov ◽  
M. K. Maniuc ◽  
P. I. Ababii ◽  
S. S. Ghinda ◽  
...  
Keyword(s):  
Respiratory Tract ◽  
Respiratory Tract Infections ◽  
Chronic Tonsillitis ◽  
Upper Respiratory Tract Infections ◽  
Control Group ◽  
Healthy Children ◽  
Upper Respiratory Tract ◽  
Upper Respiratory ◽  
Tract Infections

Currently, a rise in incidence of polyethological inflammation of the upper respiratory tract mucosa paralleled by altered resident and transient microbiota displaying in many cases increased antibiotic resistance has been noted. Opportunistic microbes play a major role in developing inflammatory process in Pirogov–Waldeyer’s ring. An inflammatory process occurring in the tonsillar lymphatic tissue results in host systemic complications. Fighting against acute and chronic infections of the upper respiratory tract holds the main task in pediatric otorhinolaryngology, as they can consequently elicit the cardiovascular, genitourinary and musculoskeletal complications. The results of studies examining this issue remain very contradictory, which accounted for a need to conduct our study on the territory of Moldova featured with mixed climatic conditions. Here, we wanted to study a role of microbial factor in etiopathogenesis of chronic tonsillitis in children. Bacteriological microbiota data for superficial palatine tonsils were obtained form 608 children subdivided into 5 groups: group I — 333 children with compensated chronic tonsillitis; group II — 87 children with decompensated chronic tonsillitis; group III — 91 children with acute upper respiratory tract infections (comparison group); group IV — 48 children with acute upper respiratory tract infections treated with antibiotic therapy; group V — 49 apparently healthy children (control group). It was found that β-hemolytic streptococcus exerting high sensitivity to virtually all antibiotics groups was detected in 17.4% of children with acute tonsilar inflammatory processes and decompensated defense in the lymphatic pharyngeal ring compared to 3.5% in control group. Streptococcus pneumoniae was isolated in all study groups ranging within 4.8–21.7%, including 14% in apparently healthy children characterized by reduced antibiotics sensitivity. The data obtained suggest that sickly children with acute and chronic upper respiratory tract infections constitute a risk group for developing somatic diseases. The high incidence of Streptococcus pneumoniae indicates a need for performing immunoprophylaxis, use of therapeutic vaccination as a up-to-date, combined approach in treatment of such pediatric cohort.

scholarly journals Role of the Dermonecrotic Toxin of Bordetella bronchiseptica in the Pathogenesis of Respiratory Disease in Swine

2002 ◽  
Vol 70 (2) ◽  
pp. 481-490 ◽  
Author(s):  
Susan L. Brockmeier ◽  
Karen B. Register ◽  
Tibor Magyar ◽  
Alistair J. Lax ◽  
Gillian D. Pullinger ◽  
...  
Keyword(s):  
Respiratory Tract ◽  
Respiratory Disease ◽  
Bordetella Bronchiseptica ◽  
Atrophic Rhinitis ◽  
Upper Respiratory Tract ◽  
Dermonecrotic Toxin ◽  
Etiologic Agents ◽  
Upper Respiratory ◽  
Phosphate Buffered Saline

ABSTRACT Bordetella bronchiseptica is one of the etiologic agents causing atrophic rhinitis and pneumonia in swine. It produces several purported virulence factors, including the dermonecrotic toxin (DNT), which has been implicated in the turbinate atrophy seen in cases of atrophic rhinitis. The purpose of these experiments was to clarify the role of this toxin in respiratory disease by comparing the pathogenicity in swine of two isogenic dnt mutants to their virulent DNT+ parent strains. Two separate experiments were performed, one with each of the mutant-parent pairs. One-week-old cesarean-derived, colostrum-deprived pigs were inoculated intranasally with the parent strain, the dnt mutant strain, or phosphate-buffered saline. Weekly nasal washes were performed to monitor colonization of the nasal cavity, and the pigs were euthanized 4 weeks after inoculation to determine colonization of tissues and to examine the respiratory tract for pathology. There was evidence that colonization of the upper respiratory tract, but not the lower respiratory tract, was slightly greater for the parent strains than for the dnt mutants. Moderate turbinate atrophy and bronchopneumonia were found in most pigs given the parent strains, while there was no turbinate atrophy or pneumonia in pigs challenged with the dnt mutant strains. Therefore, production of DNT by B. bronchiseptica is necessary to produce the lesions of turbinate atrophy and bronchopneumonia in pigs infected with this organism.

The Role of Bacterial Interference in Otitis, Sinusitis and Tonsillitis

2005 ◽  
Vol 133 (1) ◽  
pp. 139-146 ◽  
Author(s):  
Itzhak Brook
Keyword(s):  
Respiratory Tract ◽  
Respiratory Tract Infections ◽  
Antimicrobial Agents ◽  
Bacterial Flora ◽  
Upper Respiratory Tract ◽  
Bacterial Strains ◽  
Upper Respiratory ◽  
Tract Infections ◽  
Bacterial Interference

Bacterial interactions that include antagonism (interference) and synergism help maintain balance between the members of the normal endogenous flora. Alpha-streptococci that predominate in the normal respiratory tract flora attracted most attention in studies of bacterial interference. Other organisms that possess interfering characteristics in upper respiratory tract infections (URTIs) are nonhemolytic streptococci, and Prevotella and Peptostreptococcus spp. The production of bacteriocins by some microorganisms is one of the important mechanisms of interference. The role of bacterial interference in the development of URTI and its effect on the eradication of these infections is discussed. These infections include pharyngo-tonsillitis, otitis media, and sinusitis. Treatment with various antimicrobial agents can affect the balance between members of the oro-pharyngeal bacterial flora and interfering organisms. Implantation into the indigenous microflora of low virulence bacterial strains that are potentially capable of interfering with colonization and infection with other more virulent organisms has been used in preliminary studies as a means of coping with the failure of antimicrobials in the treatment of several URTI.

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