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Isolation of Pulmonary Artery Smooth Muscle Cells from Neonatal Mice
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Platelet Activating Factor Activity Modulates Hyperoxic Neonatal Lung Injury Severity.

Aaron J Yee, Jegen Kandasamy, Namasivayam Ambalavanan

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    |March 30, 2023
    PubMed
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    Platelet activating factor (PAF) signaling influences neonatal lung injury and bronchopulmonary dysplasia (BPD) in preterm infants. Blocking PAF receptor reduced lung damage and inflammation in a mouse model of hyperoxia-induced BPD.

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    Area of Science:

    • Neonatal physiology
    • Pulmonary medicine
    • Inflammation research

    Background:

    • Bronchopulmonary dysplasia (BPD) is a significant cause of lung injury in preterm infants, often driven by hyperoxia-induced inflammation.
    • Platelet activating factor (PAF) is a known inflammatory mediator in lung diseases, but its specific role in BPD pathogenesis was uninvestigated.

    Approach:

    • Investigated the role of PAF signaling in neonatal hyperoxic lung injury using wild-type (WT) and PAF receptor knockout (PTAFR KO) mice.
    • Exposed mice to hyperoxia (85% O2) from postnatal day 4 and assessed lung structure and gene expression.
    • Analyzed lung morphometry and differential gene expression pathways to understand PAF's impact.

    Key Points:

    • PTAFR KO mice exhibited reduced alveolar simplification compared to WT mice following hyperoxia exposure.
    • PAF signaling influenced hypercytokinemia/hyperchemokinemia in WT mice and NAD signaling in PTAFR KO mice.
    • Pro-inflammatory gene expression (CXCL1, CCL2, IL-6) was elevated in WT mice, while metabolic regulators (HMGCS2, SIRT3) were upregulated in PTAFR KO mice.

    Conclusions:

    • PAF signaling contributes to inflammation in neonatal hyperoxic lung injury but may not be a primary driver of fibrotic processes.
    • PAF receptor blockade attenuates lung structural damage in a mouse model of BPD.
    • PAF signaling may modulate BPD risk through pulmonary inflammation and metabolic reprogramming in preterm infants.