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Serum immunoglobulin E levels predict human airway reactivity in vitro
D Schmidt1, N Watson, E Ruehlmann
1Leiden University Medical Center, Department of Pulmonology, Leiden, The Netherlands.
Summary
Elevated serum immunoglobulin E (IgE) levels predict airway hyperresponsiveness to histamine in vitro. This study demonstrates that in vitro passive sensitization models non-specific airway hyperreactivity seen in vivo.
Area of Science:
- Pulmonary Medicine
- Immunology
- Respiratory Physiology
Background:
- Airway hyperresponsiveness is a hallmark of conditions like asthma and chronic bronchitis.
- Previous research on the link between in vivo airway reactivity and in vitro responsiveness has yielded inconclusive results.
Purpose of the Study:
- To investigate if elevated serum immunoglobulin E (IgE) correlates with increased in vitro airway reactivity.
- To clarify the role of circulating IgE in bronchial smooth muscle reactivity.
Main Methods:
- Bronchial rings from patients with high (>200 U/mL) and low (<10 U/mL) serum IgE levels were used.
- Tissues were passively sensitized with serum containing high IgE levels.
- Contractile responses to histamine were measured in an organ bath.
Main Results:
- Airways from patients with high IgE showed significantly increased histamine responsiveness compared to those with low IgE.
- Passive sensitization increased histamine responsiveness in low-IgE airways but not in high-IgE airways.
- No difference in histamine reactivity was observed between non-sensitized and sensitized high-IgE tissues.
Conclusions:
- Elevated serum IgE levels are predictive of in vitro airway hyperresponsiveness to histamine.
- The in vitro passive sensitization model replicates non-specific airway hyperreactivity relevant to in vivo conditions.