is an opportunistic pathogen responsible for widespread illness and is a major global health issue for children, the elderly, and the immunocompromised population. Pneumolysin (PLY) is a cholesterol-dependent cytolysin (CDC) and key pneumococcal virulence factor involved in all phases of pneumococcal disease, including transmission, colonization, and infection. In this review we cover the biology and cytolytic function of PLY, its contribution to pathogenesis, and its known interactions and effects on the host with regard to tissue damage and immune response. Additionally, we review statins as a therapeutic option for CDC toxicity and PLY toxoid as a vaccine candidate in protein-based vaccines.
Download full-text PDF |
Source |
---|---|
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC7343714 | PMC |
http://dx.doi.org/10.3389/fmicb.2020.01543 | DOI Listing |
Commun Biol
December 2024
Department of Microbiology, New York University School of Medicine, New York, NY, USA.
Using chromosomal barcoding, we observed that >97% of the Streptococcus pneumoniae (Spn) population turns over in the lung within 2 days post-inoculation in a murine model. This marked collapse of diversity and bacterial turnover was associated with acute inflammation (severe pneumococcal pneumonia), high bacterial numbers in the lungs, bacteremia, and mortality. Intra-strain competition mediated by the blp locus, which expresses bacteriocins in a quorum-sensing-dependent manner, was required for each of these effects.
View Article and Find Full Text PDFJ Appl Microbiol
October 2024
Children's Diagnosis and Treatment Center, The Affiliated Hospital to Changchun University of Chinese Medicine, No. 185, Shenzhen Street, Nanguan District, Changchun, Jilin 130022, China.
mSphere
October 2024
Department of Microbiology, Osaka University Graduate School of Dentistry, Osaka, Japan.
Commun Biol
September 2024
State Key Laboratory of Microbial Resources, Institute of Microbiology, Chinese Academy of Sciences, Beijing, China.
Pneumolysin (Ply) of Streptococcus pneumoniae (pneumococcus) at relatively high and low levels facilitates pneumococcal invasion into the lung and brain, respectively; however, the regulatory mechanisms of Ply expression are poorly understood. Here, we find that a small RNA plyT, processed from the 3'UTR of the ply operon, is expressed higher in anaerobically- than in statically-cultured pneumococcus D39. Using bioinformatic, biochemical and genetic approaches, we reveal that PlyT inhibits Ply synthesis and hemolytic activities by pairing with an RBS-embedded intergenic region of the ply operon.
View Article and Find Full Text PDFMicrobiol Spectr
October 2024
Department of Microbiology, Faculty of Pharmacy, Meijo University, Nagoya, Japan.
Unlabelled: Reports of novel species of α-hemolytic have increased recently. However, limited information exists regarding the pathogenicity of these species, with the exception of and . In this study, a quinolone-resistant α- strain, MTG105, was isolated from the sputum of a patient with pneumonia.
View Article and Find Full Text PDFEnter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!