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Role of phosphorylcholine in Streptococcus pneumoniae and nontypeable Haemophilus influenzae adherence to epithelial cells.
- Source :
-
Auris, nasus, larynx [Auris Nasus Larynx] 2019 Aug; Vol. 46 (4), pp. 513-519. Date of Electronic Publication: 2018 Nov 29. - Publication Year :
- 2019
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Abstract
- Objective: Phosphorylcholine (PC) is a structural component of Streptococcus pneumoniae (Spn) and nontypeable Haemophilus influenzae (NTHi), and is known to be associated with adherence through the platelet activating factor receptor (PAF-R). Furthermore, high PC expression is considered to be involved in Spn and NTHi virulence. In this study, we examined the influence of PC expression on the adherence of Spn and NTHi to epithelial cells in order to clarify the potential effectiveness of a vaccine targeting PC.<br />Methods: Twenty-seven strains of Spn and twenty-two strains of NTHi were used, cultured overnight, and PC expression was evaluated by fluorescence activated cell sorting; the strains were divided into two groups: PC low expression (PC-low) and PC high expression (PC-high) groups. Bacterial adherence was then examined using Detroit 562 cells and BALB/c mice. Bacterial invasion was then examined in Detroit 562 cells.<br />Results: The adherence of Spn and NTHi and invasion of NTHi in the PC-high group was significantly reduced by pretreatment with a monoclonal anti-PC antibody (TEPC-15), PAF-R antagonist (ABT-491), and PC-keyhole limpet hemocyanin (PC-KLH). However, such findings were not observed in the PC-low group.<br />Conclusion: The present study suggests that PC is involved in the mucosal adhesion of Spn and NTHi, and the mucosal invasion of NTHi with PC-high strains, but not PC-low strains. These results suggest that a PC-targeting mucosal vaccine only affects PC-high Spn and NTHi strains and does not disturb commensal bacterial flora in the upper respiratory tract, which comprises nonpathogenic PC-low bacteria.<br /> (Copyright © 2018 Elsevier B.V. All rights reserved.)
- Subjects :
- Animals
Cell Line
Flow Cytometry
Hemocyanins pharmacology
Humans
Imidazoles pharmacology
Indoles pharmacology
Mice
Mice, Inbred BALB C
Phosphorylcholine antagonists & inhibitors
Platelet Membrane Glycoproteins antagonists & inhibitors
Platelet Membrane Glycoproteins metabolism
Receptors, G-Protein-Coupled antagonists & inhibitors
Receptors, G-Protein-Coupled metabolism
Respiratory Mucosa metabolism
Virulence Factors
Bacterial Adhesion physiology
Epithelial Cells metabolism
Haemophilus influenzae metabolism
Nasal Mucosa metabolism
Phosphorylcholine metabolism
Streptococcus pneumoniae metabolism
Subjects
Details
- Language :
- English
- ISSN :
- 1879-1476
- Volume :
- 46
- Issue :
- 4
- Database :
- MEDLINE
- Journal :
- Auris, nasus, larynx
- Publication Type :
- Academic Journal
- Accession number :
- 30503566
- Full Text :
- https://doi.org/10.1016/j.anl.2018.11.003