AI Article Synopsis

  • PTX3 is identified as an important factor in the body's innate immune response to severe infections, particularly in relation to bacterial sepsis.
  • Mice lacking PTX3 showed higher bacterial levels, increased inflammation, and greater mortality, indicating its crucial role in controlling infections.
  • The study highlights PTX3's function in regulating inflammation and aiding tissue repair rather than enhancing opsonophagocytosis through interaction with the complement system.

Article Abstract

is a common pathogen in human sepsis. The emergence of multidrug-resistant strains represents a major clinical challenge in nosocomial and community acquired infections. The long pentraxin PTX3, a key component of humoral innate immunity, is involved in resistance to selected pathogens by promoting opsonophagocytosis. We investigated the relevance of PTX3 in innate immunity against infections using mice and mouse models of severe infections. Local and systemic PTX3 expression was induced following pulmonary infection, in association with the up-regulation of TNF-α and IL-1β. PTX3 deficiency in mice was associated with higher bacterial burden and mortality, release of pro-inflammatory cytokines as well as IL-10 in the lung and systemically. The analysis of the mechanisms responsible of PTX3-dependent control of infection revealed that PTX3 did not interact with , or promote opsonophagocytosis. The comparison of susceptibility of wild-type, and / mice to the infection showed that PTX3 acted in a complement-independent manner. Lung histopathological analysis showed more severe lesions in mice with fibrinosuppurative, necrotizing and haemorrhagic bronchopneumonia, associated with increased fibrin deposition in the lung and circulating fibrinogen consumption. These findings indicate that PTX3 contributes to the control of infection by modulating inflammatory responses and tissue damage. Thus, this study emphasizes the relevance of the role of PTX3 as regulator of inflammation and orchestrator of tissue repair in innate responses to infections.

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Source
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC8173212PMC
http://dx.doi.org/10.3389/fimmu.2021.666198DOI Listing

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