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Antisense oligonucleotides-induced local blockade of T-bet expression leads to airway inflammation in rats
Gang Wang1, Chun-Tao Liu, Zeng-Li Wang
1Department of Integrated Traditional Chinese and Western Medicine, West China Hospital, Sichuan University, Chengdu 610041, China.
Aim:
To explore whether local blockade of T-box expressed in T cells (T-bet) expression in the lungs could lead to airway inflammation.
Methods:
Twenty-four rats were randomly divided into 4 groups: saline group, ovalbumin (OVA)-sensitized group, nonsense group, and the antisense group. The OVA-sensitized rats were sensitized and challenged with OVA, and the rats in the nonsense and antisense groups were subjected to an aerosol delivery of the nonsense and antisense oligonucleotides (AS-ODN) of T-bet (0.1%, w/v). The levels of interferon-gamma (IFN-gamma), interleukin-4 (IL-4), and IL-5 in the bronchoalveolar lavage fluid (BALF) were detected by ELISA, and the mRNA and the protein expression of T-bet and GATA-3 genes were examined by in situ hybridization and Western blot analysis, respectively.
Results:
The expression of T-bet mRNA and protein in the lungs of the rats in the antisense group were inhibited effectively. The lungs of the rats in the antisense and OVA-sensitized groups showed eosinophil and lymphocyte inflammatory infiltration, and eosinophilia located predominantly around the airways. The number of GATA-3 mRNA-positive cells and the level of GATA-3 protein in the lungs of the rats in the antisense and the OVA-sensitized groups significantly increased. The level of IL-4 and IL-5 in the BALF in the antisense and OVA-sensitized groups were elevated, but the level of IFN-gamma decreased markedly.
Conclusion:
Antisense ODN-induced local blockade of T-bet expression leads to airway inflammation with a selective alteration in patterns of cytokine expression and recruitment of eosinophil cells similar to that in the OVA-sensitized animals.
Insights
Blocking T-box expressed in T cells (T-bet) in the lungs of rats induced airway inflammation. This blockade altered cytokine patterns and eosinophil recruitment, mimicking ovalbumin-sensitized animals.
Area of Science:
- Immunology
- Respiratory Medicine
- Molecular Biology
Background:
- T-box expressed in T cells (T-bet) is a key transcription factor in T helper cell differentiation.
- Airway inflammation is a complex process involving various immune cells and cytokines.
- Understanding the role of T-bet in airway inflammation is crucial for developing targeted therapies.
Purpose of the Study:
- To investigate the effect of locally blocking T-box expressed in T cells (T-bet) expression in rat lungs on airway inflammation.
- To determine if T-bet blockade can induce an inflammatory response similar to that seen in ovalbumin-sensitized animals.
Main Methods:
- Twenty-four rats were divided into four groups: saline, ovalbumin (OVA)-sensitized, nonsense oligonucleotide, and antisense oligonucleotide (AS-ODN) for T-bet.
- AS-ODN or nonsense oligonucleotides were delivered via aerosol to block T-bet expression.
- Levels of cytokines (IFN-gamma, IL-4, IL-5) in bronchoalveolar lavage fluid (BALF) were measured by ELISA.
- T-bet and GATA-3 mRNA and protein expression were assessed using in situ hybridization and Western blot.
Main Results:
- Local blockade of T-bet expression using AS-ODN was effective in inhibiting T-bet mRNA and protein levels in rat lungs.
- Both AS-ODN and OVA-sensitized groups exhibited eosinophil and lymphocyte inflammatory infiltration in the lungs, primarily around airways.
- GATA-3 expression and levels of IL-4 and IL-5 were significantly increased in the AS-ODN and OVA-sensitized groups.
- IFN-gamma levels markedly decreased in both the AS-ODN and OVA-sensitized groups.
Conclusions:
- Local blockade of T-bet expression via antisense oligonucleotides induces airway inflammation in rats.
- This induced inflammation is characterized by altered cytokine profiles and eosinophil recruitment, resembling that in ovalbumin-sensitized animals.
- These findings highlight the critical role of T-bet in regulating airway inflammation and immune responses.
