Haemophilin-Producing Strains of Haemophilus haemolyticus Protect Respiratory Epithelia from NTHi Colonisation and Internalisation
| Autor: | Brianna Atto, Stephen G. Tristram, Dale Kunde, David A. Gell |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2021 |
| Předmět: |
0301 basic medicine
Microbiology (medical) respiratory probiotic Haemophilus influenzae 030106 microbiology Cell Haemophilus haemolyticus haem haem-binding protein haemophore haemophilin host–cell interactions respiratory infections lcsh:Medicine Biology medicine.disease_cause Article Microbiology 03 medical and health sciences medicine otorhinolaryngologic diseases Immunology and Allergy Molecular Biology Pathogen General Immunology and Microbiology lcsh:R biology.organism_classification Colonisation 030104 developmental biology Infectious Diseases medicine.anatomical_structure Cell culture Respiratory epithelium Respiratory tract |
| Zdroj: | Pathogens, Vol 10, Iss 29, p 29 (2021) Pathogens Pathogens; Volume 10; Issue 1; Pages: 29 |
| ISSN: | 2076-0817 |
| Popis: | Nontypeable Haemophilus influenzae (NTHi) is a significant respiratory tract pathogen responsible for infections that collectively pose a substantial health and socioeconomic burden. The clinical course of these infections is largely dictated by NTHi interactions with host respiratory epithelia, and thus, approaches that disrupt colonisation and invasion may have significant therapeutic potential. Survival, successful host–cell interactions, and pathogenesis are reliant on NTHi’s ability to sequester host-derived haem. Previously, we demonstrated the therapeutic potential of exploiting this haem-dependence using a closely related competitor bacterium, Haemophilus haemolyticus (Hh). Hh strains capable of producing the novel haem-binding protein haemophilin (Hpl) possessed potent inhibitory activity by restricting NTHi access to haem in a broth co-culture environment. Here, we extend this work to cell culture models that more closely represent the human respiratory epithelium and show that Hh strains with high levels of hpl expression protect epithelial cell line monolayers against adhesion and invasion by NTHi. Inhibitory activity was dependent on the level of Hpl production, which was stimulated by NTHi challenge and nasopharyngeal cell exposure. Provided these protective benefits translate to in vivo applications, Hpl-producing Hh may have probiotic utility against NTHi infections by inhibiting requisite nasopharyngeal colonisation. |
| Databáze: | OpenAIRE |
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