What question did this study set out to answer?

The study aimed to investigate the impact of dietary nitrite and nitrated fatty acids on inflammation and airway hyperresponsiveness in a mouse asthma model.

March 14, 2026

Effect of dietary nitrite and nitrated fatty acids on airway hyperresponsiveness and inflammation in a mouse model of asthma

Key Points

The study aimed to investigate the impact of dietary nitrite and nitrated fatty acids on inflammation and airway hyperresponsiveness in a mouse asthma model.
Female BALB/c mice were sensitized with OVA+Al(OH)3 and challenged with OVA or PBS.
Dietary nitrite was administered via nitrite-enriched drinking water from days 10 to 17.
Nitrated fatty acids were delivered through a subcutaneously placed osmotic pump at 5 mg/kg/day from days 10 to 17.
Airway resistance to metacholine and inflammatory cell counts in bronchoalveolar lavage were measured on day 17.
OVA exposure increased airway resistance compared to control in all groups, all p<0.001.
No differences in airway resistance were found between OVA groups with or without dietary nitrite or nitrated fatty acids (p>0.05).
OVA increased eosinophils compared to control in all groups, all p<0.001.
Eosinophil numbers were not different between OVA groups with and without dietary nitrite or nitrated fatty acids (p>0.05).
Eosinophil counts in OVA-NO2-FAs treated animals were higher than those in OVA alone, p<0.001.

Abstract

Dietary nitrite (DN) generates NO that lowers blood pressure in vivo . Nitrated fatty acids (NO 2 -FAs) are formed endogenously from NO and nitrite and display broad anti-inflammatory effects including protection in an in vivo model of inflammatory bowel disease. Our aim was to investigate if DN or NO 2 -FAs affect airway hyperresponsiveness and inflammation in a mouse model of asthma. Female BALB/c mice were sensitized with OVA+Al(OH) 3 on day 0 and 7 and challenged with OVA or PBS i.n. on day 14-16. DN was administered day 10-17 by nitrite-enriched drinking water. NO 2 -FAs (5 mg/kg/day) were administrated day 10-17 by a s.c. placed osmotic pump. Airway resistance (R N ) to metacholine and inflammatory cells in bronchoalveolar lavage (BAL) were determined on day 17. OVA induced an increase in R N compare to ctrl in all groups (OVA vs. PBS; 5.3±0.2 vs. 2.3±0.1, OVA-DN vs. PBS; 5.6±0.2 vs. 2.5±0.1, OVA-NO 2 -FAs vs. PBS; 5.4±0.2 vs. 2.2±0.1 (cmH 2 0/mL), all p0.05). OVA induced an increase in BAL eosinophils (EOS) compared to ctrl in all groups (OVA vs. PBS; 25±5.5 vs. 0±0, OVA-DN vs. PBS; 21±4 vs. 0±0, OVA-NO 2 -FAs vs. PBS; 45±7 vs. 0.1±0 (10,000 cells/mL), all p0.05). The number of EOS were higher in OVA- NO 2 -FAs treated animals versus OVA alone (p<0.001). To conclude, neither DN nor NO 2 -FAs displayed anti-inflammatory effects in this asthma model, indicating that there is tissue specificity in the actions of these reactive nitrogen oxide species.

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