Regulation of Inflammation and Protection Against Invasive Pneumococcal Infection by the Long Pentraxin PTX3

Overview

Journal Elife

Specialty Biology

Date 2023 May 24

PMID 37222419

Authors

Remi Porte

Rita Silva-Gomes

Charlotte Theroude

Raffaella Parente

Fatemeh Asgari

Marina Sironi

Fabio Pasqualini

Sonia Valentino

Rosanna Asselta

Camilla Recordati

Marta Noemi Monari

Andrea Doni

Antonio Inforzato

Carlos Rodriguez-Gallego

Ignacio Obando

Elena Colino

Barbara Bottazzi

Alberto Mantovani

Affiliations

Soon will be listed here.

Abstract

is a major pathogen in children, elderly subjects, and immunodeficient patients. Pentraxin 3 (PTX3) is a fluid-phase pattern recognition molecule (PRM) involved in resistance to selected microbial agents and in regulation of inflammation. The present study was designed to assess the role of PTX3 in invasive pneumococcal infection. In a murine model of invasive pneumococcal infection, PTX3 was strongly induced in non-hematopoietic (particularly, endothelial) cells. The IL-1β/MyD88 axis played a major role in regulation of the gene expression. mice presented more severe invasive pneumococcal infection. Although high concentrations of PTX3 had opsonic activity in vitro, no evidence of PTX3-enhanced phagocytosis was obtained in vivo. In contrast, -deficient mice showed enhanced recruitment of neutrophils and inflammation. Using deficient mice, we found that protection against pneumococcus was dependent upon PTX3-mediated regulation of neutrophil inflammation. In humans, gene polymorphisms were associated with invasive pneumococcal infections. Thus, this fluid-phase PRM plays an important role in tuning inflammation and resistance against invasive pneumococcal infection.

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