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Airway Inflammation and Lung Function in Sickle Cell Disease
Aliva De1, Sabhyata Agrawal2, Kerry Morrone3
1Division of Pediatric Pulmonology, Columbia University Medical Center, Vagelos College of Physicians and Surgeons, New York, New York.
Pediatric Allergy, Immunology, and Pulmonology
|September 28, 2019
Summary
Sickle cell disease (SCD) patients show distinct inflammatory profiles compared to allergic asthma patients, with elevated Th-1, Th-2, and monocytic markers. These inflammatory markers correlate with reduced lung function in SCD.
Area of Science:
- Pulmonary Medicine
- Immunology
- Hematology
Background:
- Asthma is a common comorbidity in sickle cell disease (SCD).
- Obstructive lung disease in SCD may stem from unique inflammatory pathways distinct from allergic asthma.
- Understanding these pathways is crucial for managing SCD-related pulmonary complications.
Purpose of the Study:
- To compare airway and systemic inflammatory markers between SCD patients with pulmonary issues and those with allergic asthma.
- To identify inflammatory markers that differentiate SCD-related lung disease from allergic asthma.
- To correlate these markers with clinical measures of pulmonary disease in SCD.
Main Methods:
- A pilot translational study involving 15 SCD patients and 15 allergic asthma controls (ages 6-21).
- Quantification of inflammatory markers: T helper cell subsets, serum/exhaled breath condensate (EBC) cytokines/chemokines (Th-1/Th-17, Th-2, monocytic), and serum cysteinyl leukotrienes B4 (LTB4).
- Correlation analysis with atopic sensitization, pulmonary function tests (PFTs), and hemolysis markers.
Main Results:
- SCD patients had elevated white blood cells and monocytes; allergic asthma controls had higher atopic characteristics.
- Higher levels of TNF-alpha, IP-10, IL-4 (serum), and MCP-1 (EBC) were observed in the SCD group.
- Pulmonary function (FVC, FEV1) in SCD patients inversely correlated with serum IP-10 and LTB4 levels.
Conclusions:
- SCD patients exhibit elevated inflammatory markers across Th-1, Th-2, and monocytic pathways compared to allergic asthmatics.
- Th-1 pathway markers significantly correlated with pulmonary function deficits in SCD patients.
- These findings suggest distinct inflammatory mechanisms driving obstructive lung disease in SCD.
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