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European Journal of Medical Research

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Open Access 01-12-2015 | Research

In vitro expression of Streptococcus pneumoniae ply gene in human monocytes and pneumocytes

Authors: Da-Kang Hu, Yang Liu, Xiang-Yang Li, Ying Qu

Published in: European Journal of Medical Research | Issue 1/2015

Abstract

Background

Streptococcus pneumoniae is one major cause of pneumonia in human and contains various virulence factors that contribute to pathogenesis of pneumococcal disease. This study investigated the role of pneumolysin, Ply, in facilitating S. pneumoniae invasion into the host blood stream.

Methods

S. pneumoniae strains were isolated from clinical blood and sputum samples and confirmed by PCR. Expression of ply gene was assessed by infecting human monocytes and pneumocytes.

Results

A total of 23 strains of S. pneumoniae isolated from blood (n = 11) and sputum (n = 12) along with S. pneumoniae ATCC49619 were used to infect human monocyte (THP-1) and Type II pneumocyte (A549) cell lines. All clinical strains of S. pneumoniae showed higher expression of ply mRNA than the American Type Culture Collection (ATCC) strain. Among the clinical strains, blood isolates showed higher expression of ply genes than sputum isolates, i.e., 2^1.5- to 2^1.6-folds in THP-1 and 2^0.4- to 2^4.9-folds in A549 cell lines.

Conclusions

The data from the current study demonstrated that ply gene of blood- and sputum-derived S. pneumoniae is differentially expressed in two different cell lines. Under survival pressure, ply is highly expressed in these two cell lines for blood-derived S. pneumoniae, indicating that ply gene may facilitate S. pneumoniae invasion into the host blood system.

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Title: In vitro expression of Streptococcus pneumoniae ply gene in human monocytes and pneumocytes
Authors: Da-Kang Hu
Yang Liu
Xiang-Yang Li
Ying Qu
Publication date: 01-12-2015
Publisher: BioMed Central
Published in: European Journal of Medical Research / Issue 1/2015
Electronic ISSN: 2047-783X
DOI: https://doi.org/10.1186/s40001-015-0142-4

Keynote webinar | Spotlight on medication adherence

Springer Medicine

In vitro expression of Streptococcus pneumoniae ply gene in human monocytes and pneumocytes

Abstract

Background

Methods

Results

Conclusions

Keynote webinar | Spotlight on medication adherence

Springer Medicine

Abstract

Background

Methods

Results

Conclusions

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