Mega-dose vitamin C attenuated lung inflammation in mouse asthma model

Area of Science:

• Immunology
• Pharmacology
• Respiratory Medicine

Background:

• Asthma is a Th2-dependent inflammatory airway disease.
• Oxidative stress is a significant factor in asthma pathology.
• Vitamin C, an antioxidant, may modulate immune responses.

Purpose of the Study:

• To investigate the effects of mega-dose vitamin C in an ovalbumin-induced asthma mouse model.
• To determine if vitamin C administration influences Th1/Th2 balance in asthma.
• To evaluate vitamin C's impact on airway inflammation and hyperreactivity.

Main Methods:

• Ovalbumin-induced asthma model in mice.
• Administration of 3-5 mg of vitamin C at the time of antigen challenge.
• Evaluation of Th1/Th2 balance, airway hyperreactivity to methacholine, and inflammatory cell counts in bronchoalveolar lavage fluid.
• Histopathological assessment of lung tissue for inflammatory cell infiltration.

Main Results:

• Vitamin C did not alter the Th1/Th2 cytokine balance in the asthma model.
• A significant decrease in airway hyperreactivity to methacholine was observed.
• Reduced numbers of inflammatory cells in bronchoalveolar lavage fluid and moderate reduction in lung tissue inflammation were noted.

Conclusions:

• Vitamin C exhibits moderate anti-inflammatory effects in this asthma model, independent of Th1/Th2 shifting.
• Vitamin C administration at the time of antigen challenge reduced airway hyperreactivity and inflammation.
• Mega-dose vitamin C may serve as a cost-effective supplementary therapy for asthma management.