Understanding microbial-host interactions in the oral cavity is essential for elucidating oral disease pathogenesis and its systemic implications. In vitro bacteria-host cell coculture models have enabled fundamental studies to characterize bacterial infection and host responses in a reductionist yet reproducible manner. However, existing in vitro coculture models fail to establish conditions that are suitable for the growth of both mammalian cells and anaerobes, thereby hindering a comprehensive understanding of their interactions. Here, we present an asymmetric gas coculture system that simulates the oral microenvironment by maintaining distinct normoxic and anaerobic conditions for gingival epithelial cells and anaerobic bacteria, respectively. Using a key oral pathobiont, Fusobacterium nucleatum, as the primary test bed, we demonstrate that the system preserves bacterial viability and supports the integrity of telomerase-immortalized gingival keratinocytes. Compared to conventional models, this system enhanced bacterial invasion, elevated intracellular bacterial loads, and elicited more robust host pro-inflammatory responses, including increased secretion of CXCL10, IL-6, and IL-8. In addition, the model enabled precise evaluation of antibiotic efficacy against intracellular pathogens. Finally, we validate the ability of the asymmetric system to support the proliferation of a more oxygen-sensitive oral pathobiont, Porphyromonas gingivalis. These results underscore the utility of this coculture platform for studying oral microbial pathogenesis and screening therapeutics, offering a physiologically relevant approach to advance oral and systemic health research.
Coculture Techniques/methods* ; Humans ; Fusobacterium nucleatum/physiology* ; Gingiva/microbiology* ; Keratinocytes/microbiology* ; Host Microbial Interactions ; Mouth/microbiology* ; Host-Pathogen Interactions ; Epithelial Cells/microbiology* ; Cells, Cultured ; Porphyromonas gingivalis

BACKGROUND: It is unclear to which extent the rate of disclosure of the diagnosis "HIV" to the social environment and the nature of experienced responses are correlated with the current mental health status of HIV-infected patients living in Germany. MATERIALS AND METHODS: Eighty consecutive patients of two German HIV outpatient clinics were enrolled. Patients performed the Hospital Anxiety and Depression Scale (HADS) in its German version. Disclosure behaviour and the experienced responses after disclosing as perceived by the participants were assessed using a questionnaire. In addition, patients were asked to state whether they felt guilty for the infection on a 1-4 point Likert scale. RESULTS: Pathological results on the anxiety scale were reached by 40% of male and 73% of female patients, and on the depression scale by 30% of male and 47% of female patients, thus significantly exceeding recently assessed values in the German general population, except for depression in males. None of the HADS scale results was interrelated either with the rate of disclosure or the experienced responses. 36% of patients reported to feel guilty for the infection, which was positively correlated with results from the HADS. Limitation: The time since the single disclosure events was not assessed, and the subgroup of women was comparably small. CONCLUSIONS: Despite substantial improvement in treatment, HIV-infected patients in Germany still suffer from an elevated level of anxiety and, in part, depression. However, mental health status was neither related with disclosure behaviour nor with experienced responses. We hypothesize that internal beliefs may play a more important role.
Ambulatory Care Facilities ; Anxiety* ; Cohort Studies* ; Depression* ; Diagnosis ; Disclosure* ; Female ; Germany ; HIV* ; Humans ; Male ; Mental Health ; Social Environment ; Surveys and Questionnaires