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Insights Into the Neuroinflammatory Responses After Neonatal Hypoxia-Ischemia

Neonatal hypoxia-ischemia (HI) is one of the major causes of death and/or lifelong neurobehavioral and cognitive dysfunction. Undoubtedly, brain damage following HI insult is a complex process with multiple contributing mechanisms and pathways resulting in both early and delayed injury. It is increasingly recognized that one of the leading pathogenic factors of neonatal brain damage is inflammation, induced by activation of the central and peripheral immune system. Immune responses are induced within minutes and can expand for weeks and even months after the insult. Both activated intrinsic (glia) and infiltrating cells (mast cells, monocytes/macrophages) produce soluble inflammatory molecules such as cytokines, chemokines, reactive oxygen, and nitrogen species, which are thought to be pivotal mediators of persistent neuronal injury. This manuscript provides a brief summary of the current knowledge concerning the specific contribution of different cell types and soluble factors to injury of the developing brain caused by neonatal HI. Finally, we discuss the potential forthcoming treatments aimed at targeting inflammation and then attenuation of damaging effects caused by neonatal HI.