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Transfer of Manipulated Tumor-associated Neutrophils into Tumor-Bearing Mice to Study their Angiogenic Potential In Vivo
Published on: July 20, 2019
What does tumour necrosis factor excess do to the immune system long term?
J Clark1, P Vagenas, M Panesar
1Kennedy Institute of Rheumatology Division, Faculty of Medicine, Imperial College, 1 Aspenlea Road, Hammersmith, London W6 8LH, UK.
Annals of the Rheumatic Diseases
|October 22, 2005
Summary
Prolonged tumor necrosis factor (TNF) stimulation alters immune cell signaling thresholds. This sustained engagement may lead to localized interleukin-2 (IL-2) deficiency, impacting chronic inflammatory and immune responses.
Area of Science:
- Immunology
- Molecular Biology
- Cell Signaling
Background:
- The tumor necrosis factor (TNF)/TNF-receptor (TNF-R) superfamily plays a critical role in regulating immune responses, including lymphoid neogenesis, immune cell costimulation, and apoptosis.
- Studies of gain-of-function and gene-deficient mutants have elucidated the functions of individual TNF-R superfamily members, highlighting their roles in conditions like inflammatory polyarthritis and osteoclastogenesis.
- While acute TNF-R signaling pathways like NF-kappaB and MAPK are well-understood, the molecular basis of sustained signaling remains unclear, despite its importance in chronic inflammatory diseases.
Purpose of the Study:
- To investigate the molecular mechanisms underlying sustained TNF-receptor (TNF-R) engagement, particularly in T cells.
- To identify molecular footprints associated with prolonged TNF stimulation and their impact on immune function.
- To explore the hypothesis that sustained TNF exposure leads to localized interleukin-2 (IL-2) deficiency at inflammatory sites.
Main Methods:
- Focus on T cells to analyze molecular events following sustained TNF-receptor engagement.
- Characterization of signaling pathways involved in prolonged TNF stimulation.
- Analysis of potential alterations in immune cell function due to sustained TNF signaling.
Main Results:
- Prolonged TNF stimulation alters signaling thresholds over time in T cells.
- Identification of molecular footprints associated with sustained TNF-receptor engagement.
- Evidence suggests that sustained TNF exposure may result in localized IL-2 deficiency.
Conclusions:
- Sustained TNF-receptor engagement has distinct molecular consequences compared to acute signaling.
- Altered signaling thresholds and potential localized IL-2 deficiency are key outcomes of prolonged TNF stimulation.
- Understanding these mechanisms is crucial for comprehending chronic inflammatory and immune responses.
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