ArticleInfection and immunity2013
The Haemophilus influenzae Sap transporter mediates bacterium-epithelial cell homeostasis.
Article in Infection and immunity, 2013. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 26 papers.
What it found
Each row is one number read from the abstract, on the scale the paper reported it, with its interval. Left of the dashed line favours the treatment, right favours the comparator. Under each row is the sentence it came from. New to these charts? A ten-minute tutorial.
The abstract states no effect estimate the extractor could read, or names no intervention and outcome on the map, so this paper lights no cell and moves no belief. It is still indexed, cited and linked below.
The trial behind it
Trials whose registry record cites this paper, or whose number appears in the abstract. A trial that started after this paper was published is citing it as background, not reporting it.
Neither the registry nor the abstract names a trial number. If this is a trial report, that itself is worth knowing.
Who cites it
26 citing papers in PubMed, 35 citations in OpenAlex.
- PstSCAB and SapBCDF are putrescine exporters inMicrobiology spectrum · 2026Article
- Exploiting haem-iron dependence of nontypeableFrontiers in cellular and infection microbiology · 2025Review
- Tolerance to Haemophilus influenzae infection in human epithelial cells: Insights from a primary cell-based model.PLoS pathogens · 2024Article
- In vitro modelling of bacterial pneumonia: a comparative analysis of widely applied complex cell culture models.FEMS microbiology reviews · 2024Review
- Antimicrobial Peptide Recognition Motif of the Substrate Binding Protein SapA from NontypeableBiochemistry · 2024Article
- Invited review: human air-liquid-interface organotypic airway tissue models derived from primary tracheobronchial epithelial cells-overview and perspectives.In vitro cellular & developmental biology. Animal · 2021Review
- Article
- Continuous Microevolution Accelerates Disease Progression during Sequential Episodes of Infection.Cell reports · 2020Article
- Moonlighting of Haemophilus influenzae heme acquisition systems contributes to the host airway-pathogen interplay in a coordinated manner.Virulence · 2019Article
- Pathogenic Mannheimia haemolytica Invades Differentiated Bovine Airway Epithelial Cells.Infection and immunity · 2019Article
- A Novel Role for the Klebsiella pneumoniae Sap (Sensitivity to Antimicrobial Peptides) Transporter in Intestinal Cell Interactions, Innate Immune Responses, Liver Abscess, and Virulence.The Journal of infectious diseases · 2019Article
- Lung Surfactant Lipids Provide Immune Protection AgainstFrontiers in immunology · 2019Article
- Microevolution in response to transient heme-iron restriction enhances intracellular bacterial community development and persistence.PLoS pathogens · 2018Article
- Transient Nutrient Deprivation Promotes Macropinocytosis-Dependent Intracellular Bacterial Community Development.mSphere · 2018Article
- Selective substrate uptake: The role of ATP-binding cassette (ABC) importers in pathogenesis.Biochimica et biophysica acta. Biomembranes · 2018Review
- Role ofInfection and immunity · 2017Article
- A novel streptococcal cell-cell communication peptide promotes pneumococcal virulence and biofilm formation.Molecular microbiology · 2017Article
- Insights on persistent airway infection by non-typeable Haemophilus influenzae in chronic obstructive pulmonary disease.Pathogens and disease · 2017Review
- Panel 4: Report of the Microbiology Panel.Otolaryngology--head and neck surgery : official journal of American Academy of Otolaryngology-Head and Neck Surgery · 2017Review
- Transformed Recombinant Enrichment Profiling Rapidly Identifies HMW1 as an Intracellular Invasion Locus in Haemophilus influenza.PLoS pathogens · 2016Article
Corrections and comments
PubMed lists nothing against this paper. Absence here is not a guarantee, only a check that was made.
Authors and funding
4 authors at 1 institution in 1 country.
Funding
Abstract
Nontypeable Haemophilus influenzae (NTHI) is a commensal inhabitant of the human nasopharynx and a causative agent of otitis media and other diseases of the upper and lower human airway. During colonization within the host, NTHI must acquire essential nutrients and evade immune attack. We previously demonstrated that the NTHI Sap transporter, an inner membrane protein complex, mediates resistance to antimicrobial peptides and is required for heme homeostasis. We hypothesized that Sap transporter functions are critical for NTHI interaction with the host epithelium and establishment of colonization. Thus, we cocultured the parent or the sapA mutant on polarized epithelial cells grown at an air-liquid interface, as a physiological model of NTHI colonization, to determine the contribution of the Sap transporter to bacterium-host cell interactions. Although SapA-deficient NTHI was less adherent to epithelial cells, we observed a significant increase in invasive bacteria compared to the parent strain. Upon internalization, the sapA mutant appeared free in the cytoplasm, whereas the parent strain was primarily found in endosomes, indicating differential subcellular trafficking. Additionally, we observed reduced inflammatory cytokine production by the epithelium in response to the sapA mutant strain compared to the parental strain. Furthermore, chinchilla middle ears challenged with the sapA mutant demonstrated a decrease in disease severity compared to ears challenged with the parental strain. Collectively, our data suggest that NTHI senses host environmental cues via Sap transporter function to mediate interaction with host epithelial cells. Epithelial cell invasion and modulation of host inflammatory cytokine responses may promote NTHI colonization and access to essential nutrients.
Indexed as
Identifiers
What OpenQuestion holds
Registered trials
Read under generation 80e0d062 · epoch 390. Bibliography from PubMed, PubMed Central and OpenAlex; grants from NIH RePORTER; trial links from ClinicalTrials.gov; estimates, votes and beliefs from the OpenQuestion graph.