DNA Receptor Toll-Like Receptor 9 Signaling Pathway Plays a Major Immunomodulatory Role in Neonatal Acute Lung Injury by Inhibiting Inflammatory Response and Oxidative Stress.

To investigate the clinical efficacy of neonatal acute lung injury (NALI) and the mechanistic role of the DNA sensor Toll-like receptor 9 (TLR9) signaling pathway in treatment, Methods: This study enrolled 76 cases of NALI, randomly divided into 38 cases in the experimental group (intravenous injection of human immunoglobulin on the basis of nasal continuous positive airway pressure ventilation treatment) and 38 cases in the control group (nasal continuous positive airway pressure ventilation treatment). The pulmonary function parameters (forced vital capacity (FVC), forced expiratory volume in 1 s (FEV1), and FEV1/FVC), TLR9 signaling pathway-related proteins and mRNA levels (TLR9, MyD88, p38), inflammatory factors (C-reactive protein (CRP), interleukin (IL)-1β, tumor necrosis factor (TNF)-α), and immune function indicators (immunoglobulin (Ig)A, IgG, IgM) were compared between the two groups. Pearson correlation analysis was conducted to examine the relationship between TLR9 signaling pathway protein expression and immune function indicators.