{"id":23862,"date":"2024-10-28T12:43:26","date_gmt":"2024-10-28T11:43:26","guid":{"rendered":"https:\/\/www.biolife-publisher.it\/iji\/?p=23862"},"modified":"2024-11-15T13:20:24","modified_gmt":"2024-11-15T12:20:24","slug":"immunological-and-biochemical-mechanisms-of-bacterial-tracheitis","status":"publish","type":"post","link":"https:\/\/www.biolife-publisher.it\/iji\/immunological-and-biochemical-mechanisms-of-bacterial-tracheitis\/","title":{"rendered":"IMMUNOLOGICAL AND BIOCHEMICAL MECHANISMS OF BACTERIAL TRACHEITIS"},"content":{"rendered":"

Robuffo I. Immunological and biochemical mechanisms of bacterial tracheitis. International Journal of Infection.<\/em> 2022;6(2):64-67<\/p>\n

\n

I. Robuffo*<\/sup><\/p>\n

Institute of Molecular Genetics, National Research Council, Section of Chieti, Chieti, Italy.<\/p>\n

*Correspondence to:<\/em>
\nDr. Iole Robuffo,
\nInstitute of Molecular Genetics,
\nNational Research Council,
\nSection of Chieti,
\n66100 Chieti, Italy.
\ne-mail: iole.robuffo@cnr.it<\/a><\/p>\n\n\n\n
Received: 07 April, 2022
\nAccepted: 23 June, 2022\"adobe-pdf-download-icon\"<\/a><\/td>\n		ISSN 1972-6945 [online]
\nCopyright 2022 \u00a9 by Biolife-publisher
\nThis publication and\/or article is for individual use only and may not be further reproduced without written permission from the copyright holder. Unauthorized reproduction may result in financial and other penalties. Disclosure: all authors report no conflicts of interest relevant to this article.<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

KEYWORDS:<\/strong> bacterial tracheitis, immunology, pathogenesis, infection, bacteria<\/em><\/p>\n

 <\/p>\n

INTRODUCTION<\/strong><\/p>\n

 <\/p>\n

Bacterial tracheitis, also known as bacterial croup or bacterial laryngotracheobronchitis, is an acute infection of the trachea caused by various bacterial pathogens. This condition primarily affects young children and can lead to severe airway obstruction and respiratory distress. Understanding the molecular mechanisms underlying bacterial tracheitis is crucial for developing effective treatments and preventive measures. This paper explores the pathogenesis, bacterial virulence factors, host immune responses, and potential therapeutic targets associated with bacterial tracheitis.<\/p>\n

 <\/p>\n

DISCUSSION<\/strong><\/p>\n

 <\/p>\n

Bacterial tracheitis typically begins with a viral upper respiratory infection that disrupts the normal mucosal barriers and ciliary function of the respiratory tract. This disruption allows bacteria to adhere to and colonize the tracheal epithelium. Common bacterial pathogens include Staphylococcus aureus<\/em>, Streptococcus pneumoniae<\/em>, Haemophilus influenzae<\/em>, and Moraxella catarrhalis <\/em>(1). These bacteria possess various adhesins that facilitate attachment to epithelial cells. For instance, S. aureus<\/em> expresses fibronectin-binding proteins (FnBPs) and clumping factors (ClfA and ClfB), which bind to host extracellular matrix components such as fibronectin and fibrinogen, respectively (2). Bacterial tracheitis infection includes different pathogenetic steps which are outlined below (Table I).<\/p>\n

 <\/p>\n

Table I. Progression of the pathogenesis of bacterial tracheitis<\/em>.<\/p>\n\n\n\n\n\n\n\n\n\n\n\n
Step 1:<\/td>\nInitial Viral Infection<\/td>\n<\/tr>\n
<\/td>\n\u00b7\u00a0 Upper respiratory viral infection<\/p>\n

\u00b7\u00a0 Disruption of mucosal barriers<\/p>\n

\u00b7\u00a0 Impairment of ciliary function<\/td>\n<\/tr>\n

Step 2:<\/td>\nBacterial Colonization and Adherence<\/td>\n<\/tr>\n
<\/td>\n\u00b7\u00a0 Bacteria such as S. aureus<\/em>, S. pneumoniae<\/em>, H. influenzae<\/em>, and M. catarrhalis<\/em><\/p>\n

\u00b7\u00a0 Adhesins and surface proteins facilitate attachment<\/p>\n

–\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 *S. aureus<\/em>: FnBPs, ClfA, ClfB<\/p>\n

–\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 *H. influenzae<\/em>: Hap, Hib<\/p>\n

–\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 *M. catarrhalis<\/em>: UspA1, UspA2<\/td>\n<\/tr>\n

Step 3:<\/td>\nBacterial Invasion and Biofilm Formation<\/td>\n<\/tr>\n
<\/td>\n\u00b7\u00a0 Bacterial invasion of epithelial cells<\/p>\n

\u00b7\u00a0 Production of toxins and enzymes<\/p>\n

–\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 *S. aureus<\/em>: Alpha-toxin, leukocidins, proteases<\/p>\n

\u00b7\u00a0 Biofilm formation by H. influenzae<\/em> and M. catarrhalis<\/em><\/td>\n<\/tr>\n

Step 4:<\/td>\nHost Immune Response<\/td>\n<\/tr>\n
<\/td>\n\u00b7 Innate Immune Response<\/p>\n

–\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 Mucociliary escalator<\/p>\n

–\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 Neutrophils, macrophages, dendritic cells<\/p>\n

–\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 Recognition of PAMPs by PRRs (e.g., TLRs)<\/p>\n

–\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 Activation of NF-\u03baB, production of cytokines (IL-6, TNF-\u03b1)<\/td>\n<\/tr>\n

<\/td>\n\u00b7\u00a0 Adaptive Immune Response<\/p>\n

–\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 B cells produce specific antibodies<\/p>\n

–\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 CD4+ helper T cells enhance phagocyte function and B cell activation<\/p>\n

–\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 CD8+ cytotoxic T cells kill infected cells<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

 <\/p>\n

Once attached, bacteria can invade the epithelial cells and evade the host immune system. S. aureus<\/em> secretes several toxins and enzymes, including alpha-toxin, leukocidins, and proteases, which damage epithelial cells and disrupt the integrity of the mucosal barrier (3). This facilitates bacterial invasion and dissemination. Additionally, H. influenzae<\/em> and M. catarrhalis<\/em> produce biofilms, complex communities of bacteria embedded in a self-produced extracellular matrix (4). Biofilms protect bacteria from phagocytosis and antibiotic treatment, contributing to chronic and recurrent infections.<\/p>\n

Virulence factors play a critical role in the pathogenesis of bacterial tracheitis. Exotoxins, such as S. aureus<\/em> alpha-toxin, are cytolytic toxins that form pores in the host cell membranes, leading to cell lysis and death (5). Leukocidins, another group of toxins produced by S. aureus<\/em>, specifically target and kill leukocytes, impairing the host’s immune response (6). Additionally, bacterial proteases degrade host proteins, including immunoglobulins and complement proteins, further undermining immune defenses.<\/p>\n

Adhesins and surface proteins are essential for bacterial attachment and colonization. In H. influenzae<\/em>, the Haemophilus<\/em> adhesion and penetration protein (Hap) and the H. influenzae<\/em> type b antigen (Hib) are key adhesins that mediate attachment to respiratory epithelial cells (7). Similarly, M. catarrhalis<\/em> expresses the ubiquitous surface proteins A1 and A2 (UspA1 and UspA2), which bind to host epithelial cells and immune molecules like immunoglobulin D (IgD) (8).<\/p>\n

The host immune response to bacterial tracheitis involves both innate and adaptive mechanisms. The innate immune response is the first line of defense and includes physical barriers, cellular responses, and soluble factors. The mucociliary escalator, consisting of ciliated epithelial cells and mucus, traps and removes inhaled pathogens. However, when this system is compromised, innate immune cells such as neutrophils, macrophages, and dendritic cells play a crucial role. These cells recognize pathogen-associated molecular patterns (PAMPs) via pattern recognition receptors (PRRs) like toll-like receptors (TLRs). For instance, TLR4 recognizes lipopolysaccharide (LPS) from gram-negative bacteria, leading to the activation of nuclear factor-kappa B (NF-\u03baB) and the production of pro-inflammatory cytokines such as interleukin-6 (IL-6) and tumor necrosis factor (TNF) (9).<\/p>\n

The adaptive immune response is also critical in controlling bacterial tracheitis. B cells produce specific antibodies that neutralize bacterial toxins and promote opsonization and phagocytosis. T cells, particularly CD4+ helper T cells, secrete cytokines that enhance the antimicrobial functions of phagocytes and stimulate B cell antibody production. CD8+ cytotoxic T cells can directly kill infected cells, limiting the spread of intracellular pathogens. The interplay between the innate and adaptive immune responses is essential for effective clearance of the infection and prevention of recurrence.<\/p>\n

The cornerstone of bacterial tracheitis treatment is antibiotic therapy. The choice of antibiotics depends on the causative pathogen and its susceptibility profile. Empirical treatment often includes broad-spectrum antibiotics such as ceftriaxone, cefotaxime, or clindamycin until the specific pathogen is identified. For S. aureus<\/em> infections, particularly methicillin-resistant S. aureus<\/em> (MRSA), vancomycin or linezolid may be necessary. However, the increasing prevalence of antibiotic resistance highlights the need for alternative therapeutic strategies.<\/p>\n

Targeting bacterial virulence factors represents a promising approach to treating bacterial tracheitis. Inhibitors of bacterial adhesins, exotoxins, and biofilm formation can potentially reduce bacterial pathogenicity without exerting selective pressure for resistance. For instance, monoclonal antibodies against S. aureus<\/em> alpha-toxin have shown efficacy in neutralizing the toxin’s activity and protecting against infection in preclinical models (10). Similarly, small molecules that disrupt biofilm formation or enhance biofilm dispersion could improve the efficacy of antibiotic treatment.<\/p>\n

Modulating the host immune response is another potential therapeutic strategy. Enhancing the innate immune response through the administration of cytokines or immune stimulants could boost the body’s ability to fight off bacterial infections. For example, granulocyte-macrophage colony-stimulating factor (GM-CSF) has been investigated for its potential to enhance neutrophil function in bacterial infections (11). Additionally, targeting specific inflammatory pathways with anti-inflammatory agents could reduce tissue damage and improve clinical outcomes.<\/p>\n

 <\/p>\n

CONCLUSIONS<\/strong><\/p>\n

 <\/p>\n

Bacterial tracheitis is a severe infection of the trachea caused by various bacterial pathogens. Understanding the molecular mechanisms underlying its pathogenesis, including bacterial entry, colonization, virulence factors, and host immune responses, is crucial for developing effective treatments. While antibiotic therapy remains the primary treatment, emerging strategies targeting bacterial virulence factors and modulating the host immune response hold promise for improving outcomes and combating antibiotic resistance. Continued research into these mechanisms will be essential for advancing the management and prevention of bacterial tracheitis.<\/p>\n

 <\/p>\n

Conflict of interest <\/em><\/p>\n

The author declares that they have no conflict of interest.<\/p>\n

 <\/p>\n

REFERENCES<\/strong><\/p>\n

    \n
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  2. Speziale P, Pietrocola G. The Multivalent Role of Fibronectin-Binding Proteins A and B (FnBPA and FnBPB) of Staphylococcus aureus in Host Infections. Frontiers in Microbiology<\/em>. 2020;11. doi:https:\/\/doi.org\/10.3389\/fmicb.2020.02054<\/li>\n
  3. Pietrocola G, Nobile G, Rindi S, Speziale P. Staphylococcus aureus Manipulates Innate Immunity through Own and Host-Expressed Proteases. Frontiers in Cellular and Infection Microbiology<\/em>. 2017;7(166). doi:https:\/\/doi.org\/10.3389\/fcimb.2017.00166<\/li>\n
  4. Armbruster CE, Hong W, Pang B, et al. Indirect Pathogenicity of Haemophilus influenzae<\/em> and Moraxella catarrhalis<\/em> in Polymicrobial Otitis Media Occurs via Interspecies Quorum Signaling. McDaniel LS, ed. mBio<\/em>. 2010;1(3). doi:https:\/\/doi.org\/10.1128\/mbio.00102-10<\/li>\n
  5. Seilie ES, Bubeck Wardenburg J. Staphylococcus aureus pore-forming toxins: The interface of pathogen and host complexity. Seminars in Cell & Developmental Biology<\/em>. 2017;72:101-116. doi:https:\/\/doi.org\/10.1016\/j.semcdb.2017.04.003<\/li>\n
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  7. Singh B, Jalalvand F, M\u00f6rgelin M, Zipfel P, Blom AM, Riesbeck K. Haemophilus influenzae<\/em>protein E recognizes the C\u2010terminal domain of vitronectin and modulates the membrane attack complex. Molecular Microbiology<\/em>. 2011;81(1):80-98. doi:https:\/\/doi.org\/10.1111\/j.1365-2958.2011.07678.x<\/li>\n
  8. Tan T, Nordstr\u00f6m T, Forsgren A, Riesbeck K. The Respiratory Pathogen Moraxella catarrhalis <\/em>Adheres to Epithelial Cells by Interacting with Fibronectin through Ubiquitous Surface Proteins A1 and A2. The Journal of Infectious Diseases<\/em>. 2005;192(6):1029-1038. doi:https:\/\/doi.org\/10.1086\/432759<\/li>\n
  9. Zamyatina A, Heine H. Lipopolysaccharide Recognition in the Crossroads of TLR4 and Caspase-4\/11 Mediated Inflammatory Pathways. Frontiers in Immunology<\/em>. 2020;11. doi:https:\/\/doi.org\/10.3389\/fimmu.2020.585146<\/li>\n
  10. Mayor A, Chesnay A, Desoubeaux G, Ternant D, Heuz\u00e9-Vourc\u2019h N, S\u00e9cher T. Therapeutic Antibodies for the Treatment of Respiratory Tract Infections\u2014Current Overview and Perspectives. Vaccines<\/em>. 2021;9(2):151. doi:https:\/\/doi.org\/10.3390\/vaccines9020151<\/li>\n
  11. Ballinger MN, Paine R, Serezani CHC, et al. Role of Granulocyte Macrophage Colony-Stimulating Factor during Gram-Negative Lung Infection with Pseudomonas aeruginosa. American Journal of Respiratory Cell and Molecular Biology<\/em>. 2006;34(6):766-774. doi:https:\/\/doi.org\/10.1165\/rcmb.2005-0246oc<\/li>\n<\/ol>\n","protected":false},"excerpt":{"rendered":"

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