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Published on: April 13, 2010
Intermittent hypoxic pretreatment exacerbates house dust mite-induced asthma airway inflammation
Hao Meng1, Dongxue Zhang2, Yifan Que1
1Health Management Institute, The Second Medical Center & National Clinical Research Center for Geriatric Diseases, Chinese PLA General Hospital, Medical School of Chinese PLA, Beijing, China.
Background:
Asthma is widely recognized as an inflammatory disorder. In the context of this inflammatory microenvironment, the involvement of hypoxia and its impact on related pathways have drawn considerable attention. However, the exact role of hypoxia, a prevalent environmental factor, in the development and progression of asthma remains poorly understood.
Methods:
Mice were treated with house dust mite (HDM) extracts for 23 days to induce asthma. Mice were divided into room air (RA) group and intermittent hypoxic (IH) group by exposing to different conditions and IH preconditioning (IHP) were underwent to the above groups before the hypoxic regimen. Airway inflammation in mice was evaluated by airway hyperresponsiveness, excessive mucus secretion, and recruitment of inflammatory cells. Immunohistochemistry was employed to quantify the expression levels of NF-κB. Subsequently, the dose of allergen was modified to investigate whether the impact of hypoxia on asthma is affected by different doses of allergens.
Result:
Compared to the RA and IH groups, HDM-treated mice in the IHP group exhibited aggravated inflammatory cell infiltration and airway hyperresponsiveness (p＜.05). Moreover, there was an increased release of inflammatory mediators and higher expression levels of NF-κB (p＜.05). Importantly, the impact ia on asthma was found to be influenced by high dose of allergen (p＜.05).
Conclusion:
IHP treatment potentially exacerbates HDM-induced airway inflammation in asthma, with the involvement of NF-κB, particularly under high-dose allergen stimulation.
Insights
Intermittent hypoxic preconditioning (IHP) may worsen house dust mite-induced asthma by increasing airway inflammation and NF-κB activation, especially with high allergen doses.
Area of Science:
- Pulmonary Medicine
- Immunology
- Environmental Health
Background:
- Asthma is an inflammatory disorder where the role of hypoxia is not fully understood.
- Hypoxia, a common environmental factor, may influence asthma development and progression.
- The inflammatory microenvironment in asthma is a key area of research.
Purpose of the Study:
- To investigate the impact of intermittent hypoxia preconditioning (IHP) on house dust mite (HDM)-induced asthma in a mouse model.
- To determine the role of NF-κB signaling in hypoxia-exacerbated asthma.
- To assess if allergen dose affects hypoxia's impact on asthma.
Main Methods:
- Asthma was induced in mice using house dust mite (HDM) extracts over 23 days.
- Mice were exposed to room air (RA) or intermittent hypoxia (IH), with some receiving IHP before hypoxia.
- Airway inflammation markers, mucus secretion, inflammatory cell recruitment, and NF-κB expression were evaluated.
Main Results:
- IHP significantly aggravated airway inflammation and hyperresponsiveness compared to RA and IH groups.
- Increased inflammatory mediators and NF-κB expression were observed in the IHP group.
- The exacerbating effect of hypoxia on asthma was more pronounced with high-dose allergen exposure.
Conclusions:
- Intermittent hypoxic preconditioning (IHP) can exacerbate HDM-induced airway inflammation in asthma.
- NF-κB signaling is implicated in the mechanism of hypoxia-induced asthma exacerbation.
- High-dose allergen exposure amplifies the negative impact of hypoxia on asthma severity.
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