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Pulmonary arterial remodeling induced by a Th2 immune response
Eleen Daley1, Claire Emson, Christophe Guignabert
1St. Luke's Roosevelt Hospital, New York, NY 10019, USA.
The Journal of Experimental Medicine
|January 30, 2008
Summary
Adaptive immune responses to inhaled antigens can cause pulmonary arterial muscularization, a key feature of pulmonary arterial hypertension (PAH). This study provides experimental evidence linking immune responses to this vascular remodeling.
Area of Science:
- Immunology
- Cardiovascular Research
- Pulmonary Medicine
Background:
- Pulmonary arterial remodeling, marked by increased vascular smooth muscle density, is a hallmark of pulmonary arterial hypertension (PAH).
- Clinical studies suggest immune system involvement in PAH pathogenesis, but experimental validation has been limited.
Purpose of the Study:
- To investigate whether adaptive immune responses to soluble antigens can experimentally induce pulmonary arterial remodeling.
- To identify immune mechanisms contributing to pulmonary arterial muscularization.
Main Methods:
- Mice were immunized and challenged via airways with soluble antigens.
- Investigated the role of CD4(+) T cells, T helper type 2 (Th2) responses, and interleukin 13 (IL-13) in muscularization.
- Assessed smooth muscle cell density and correlated it with immune cell markers and pulmonary hypertension.
Main Results:
- Airway exposure to soluble antigens induced significant muscularization in small- to medium-sized pulmonary arteries.
- Depletion of CD4(+) T cells, inhibition of Th2 response, or blocking IL-13 ameliorated this muscularization.
- Pulmonary arterial muscularization correlated with increased resistin-like molecule alpha expression but not with pulmonary hypertension.
Conclusions:
- Adaptive immune responses to inhaled soluble antigens are sufficient to cause severe pulmonary arterial muscularization.
- These findings provide experimental support for immune-mediated mechanisms contributing to PAH.
- Pulmonary arterial muscularization may be one of several injurious events leading to PAH.
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