CCL2 and bronchopulmonary dysplasia: Researchers found high expression levels of specific cytokines stemming from classical macrophage activation such as monocyte chemoattractant protein-1 (MCP-1/CCL2), macrophage inflammatory proteins (MIP), the neutrophil chemokine IL-8, and low expression of IL-10 in association with BPD development [12, 42–45] while expression other cytokines, for example, IL-4 and IL-13 did not correlate with BPD [46].