Related Experiment Video
Updated: Sep 8, 2025
Experimental Model to Evaluate Resolution of Pneumonia
Published on: February 17, 2023
Contribution of Puma to Inflammatory Resolution During Early Pneumococcal Pneumonia
Daniel E Kennedy Ii1, Perceus Mody1, Jean-Francois Gout1
1Department of Biological Sciences, Mississippi State University, Starkville, MS, United States.
Abstract:
Apoptosis of cells at the site of infection is a requirement for shutdown of inflammatory signaling, avoiding tissue damage, and preventing progression of sepsis. Puma and Puma mice were challenged with TIGR4 strain pneumococcus and cytokines were quantitated from lungs and blood using a magnetic bead panel analysis. Puma mice exhibited higher lung and blood cytokine levels of several major inflammatory cytokines, including IL-6, G-CSF, RANTES, IL-12, IFN-ϒ, and IP-10. Puma mice were more susceptible to bacterial dissemination and exhibited more weight loss than their wild-type counterparts. RNA sequencing analysis of whole pulmonary tissue revealed Puma-dependent regulation of Nrxn2, Adam19, and Eln. Enrichment of gene ontology groups differentially expressed in Puma tissues were strongly correlated to IFN-β and -ϒ signaling. Here, we demonstrate for the first time the role of Puma in prohibition of the cytokine storm during bacterial pneumonia. These findings further suggest a role for targeting immunomodulation of IFN signaling during pulmonary inflammation. Additionally, our findings suggest previously undemonstrated roles for genes encoding regulatory and binding proteins during the early phase of the innate immune response of pneumococcal pneumonia.
Insights
Puma protein deficiency exacerbates bacterial pneumonia by increasing inflammatory cytokines and susceptibility. Targeting interferon signaling may mitigate this immune overreaction and improve outcomes in pneumococcal pneumonia.
Area of Science:
- Immunology
- Molecular Biology
- Genetics
Background:
- Apoptosis is crucial for resolving inflammation and preventing sepsis progression.
- The role of Puma in regulating the immune response during bacterial pneumonia is not well understood.
Purpose of the Study:
- To investigate the role of Puma in the innate immune response to pneumococcal pneumonia.
- To determine the impact of Puma deficiency on cytokine storm and host susceptibility.
Main Methods:
- Mice lacking Puma were infected with Streptococcus pneumoniae (TIGR4 strain).
- Cytokine levels in lung and blood were measured using magnetic bead panel analysis.
- Pulmonary gene expression was analyzed via RNA sequencing.
Main Results:
- Puma-deficient mice showed elevated levels of key inflammatory cytokines (IL-6, G-CSF, RANTES, IL-12, IFN-γ, IP-10).
- These mice exhibited increased bacterial dissemination and weight loss compared to wild-type.
- Puma deficiency altered the expression of Nrxn2, Adam19, and Eln, with enrichment of IFN signaling pathways.
Conclusions:
- Puma plays a critical role in preventing the cytokine storm during bacterial pneumonia.
- Targeting interferon signaling represents a potential therapeutic strategy for pulmonary inflammation.
- Genes regulating protein binding and innate immunity are implicated in pneumococcal pneumonia pathogenesis.
Related Concept Videos
01:29Pneumonia II: Pathophysiology
01:30Pneumonia III: Complications and Assessment
01:30Pneumonia I: Introduction
Risk Factors
Various factors influence the likelihood of developing pneumonia. Age plays a crucial role, with infants, children under two, and individuals over 65 at increased risk due to their...
01:28Pneumonia IV: Management
Bacterial Pneumonia Treatment
For bacterial pneumonia, antibiotics serve as the cornerstone of therapy. Initial treatment often begins with empirical antibiotics, tailored to the anticipated causative organism and adjusted based on culture results. Key antibiotic choices include:
01:30Pneumonia V: Nursing management and Prevention
The nurse must practice strict medical asepsis and adhere to infection control guidelines to minimize healthcare-associated infections.
Enhance airway patency
Position the patient correctly to facilitate drainage of the affected lung segments. Manual or mechanical percussion and vibration can also be employed....