LPAR1 and bronchopulmonary dysplasia: LPS administration had no impact on MLI (Figure 4I), but reduced pulmonary vessel density by 1.1-fold (Figure 4J), compared to LPS-stimulated Wistar (p < 0.05) or NaCl-treated LPAR1-deficient rats with hyperoxia-induced BPD (p < 0.01; Figures 4D,H).