Bacterial adhesion to respiratory mucus

Bacterial adhesion to respiratory mucus is a fundamental biological process that initiates the colonization of the respiratory tract by pathogenic microorganisms (Linden et al., 2008). This process involves the specific interaction between bacterial surface proteins, known as adhesins (e.g., pili, fimbriae), and the glycan chains of host mucin glycoproteins, primarily MUC5AC and MUC5B, which are the major structural components of the respiratory mucus layer (Scharfman et al., 2001). In healthy individuals, this interaction is part of the mucociliary clearance mechanism, where trapped bacteria are physically removed from the airways. However, in chronic respiratory diseases such as cystic fibrosis, COPD, and bronchiectasis, the mucus becomes hyper-concentrated and its glycosylation patterns are altered, facilitating persistent bacterial attachment and the formation of biofilms (Bansil & Turner, 2018). Therapeutic strategies targeting this process, often referred to as anti-adhesion therapies, aim to prevent or disrupt the binding of pathogens to the mucosal surface. These include the use of carbohydrate mimetics that act as competitive inhibitors, monoclonal antibodies directed against bacterial adhesins, and mucolytic agents like N-acetylcysteine that modify the physical properties of the mucus to reduce its receptivity to bacterial binding (Zhu et al., 2022). By inhibiting the initial step of infection, these therapies offer a potential alternative or adjunct to traditional antibiotics, particularly in the context of increasing antimicrobial resistance. The primary challenge in targeting this process lies in achieving high binding affinity for carbohydrate-based inhibitors and ensuring that the disruption of adhesion does not adversely affect the protective functions of the normal respiratory microbiome (Linden et al., 2008).

Other names

Bacterial mucoadhesionPathogen-mucus bindingRespiratory bacterial colonizationMucin-pathogen interaction

Inhibition of the physical and chemical binding between bacterial surface adhesins and host mucin glycoproteins through competitive inhibition or modification of mucus rheology.