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Effects of poly(ADP-ribose) polymerase inhibition on inflammatory cell migration in a murine model of asthma
László Virág1, Péter Bai, István Bak
1Department of Medical Chemistry, Research Center for Molecular Medicine, Medical and Health Science Center, University of Debrecen, Debrecen, Hungary.
Background:
Poly(ADP-ribose) polymerase-1 (PARP-1), a monomeric nuclear enzyme present in eukaryotes, plays a role in cell death, inflammatory mediator expression, and mononuclear cell recruitment in various experimental models of inflammation and reperfusion injury. Part of the molecular mechanism of this function involves the regulation of cytokine and chemokine production. Since chemokines are principal regulators of mononuclear and polymorphonuclear cell trafficking in asthma, we investigated the possibility whether PARP modulates chemokine production and cell recruitment in a murine model of asthma.
Material/Methods:
We studied ovalbumin-sensitized mice challenged with a single dose of ovalbumin.
Results:
PARP inhibition with the phenanthridinone-based PARP inhibitor PJ34 suppressed inflammatory cell migration. These effects were associated with downregulation of the CC chemokine MIP-1alpha, but not the CXC chemokine MIP-2. The production of TNF- alpha and IL-12, but not IL-5 or IL-13, was also suppressed by PARP inhibition.
Conclusions:
Our results demonstrate the pathogenetic role of PARP activation in a murine model of asthma. PARP selectively regulates the production of certain chemokines and cytokines in this experimental model, which may be responsible for some of the observed protective effects seen in the current murine asthma model.
Insights
Poly(ADP-ribose) polymerase-1 (PARP-1) inhibition reduced inflammatory cell migration in a murine asthma model. PARP-1 selectively regulates chemokine and cytokine production, suggesting a therapeutic target for asthma.
Area of Science:
- Biochemistry
- Immunology
- Pharmacology
Background:
- Poly(ADP-ribose) polymerase-1 (PARP-1) is a nuclear enzyme involved in inflammatory processes.
- PARP-1 regulates cytokine and chemokine production, key mediators in asthma pathogenesis.
- Chemokines are crucial for immune cell trafficking in asthma.
Purpose of the Study:
- To investigate the role of PARP in modulating chemokine production and cell recruitment in a murine model of asthma.
- To determine if PARP inhibition affects inflammatory cell migration in asthma.
Main Methods:
- Ovalbumin-sensitized mice were challenged with ovalbumin.
- Mice were treated with a PARP inhibitor (PJ34).
- Inflammatory cell migration, chemokine (MIP-1alpha, MIP-2), and cytokine (TNF-alpha, IL-12, IL-5, IL-13) levels were assessed.
Main Results:
- PARP inhibition with PJ34 suppressed inflammatory cell migration.
- This suppression was linked to the downregulation of CC chemokine MIP-1alpha.
- PARP inhibition also reduced TNF-alpha and IL-12 production.
Conclusions:
- PARP activation plays a pathogenic role in this murine asthma model.
- PARP selectively regulates specific chemokines and cytokines in asthma.
- PARP inhibition demonstrates protective effects in this experimental asthma model.
