title: Minocycline reduces neuronal death and attenuates microglial response after pediatric asphyxial cardiac arrest.
abstract: The mechanisms leading to delayed neuronal death after asphyxial cardiac arrest (ACA) in the developing brain are unknown. This study aimed at investigating the possible role of microglial activation in neuronal death in developing brain after ACA. Postnatal day-17 rats were subjected to 9 mins of ACA followed by resuscitation. Rats were randomized to treatment with minocycline, (90 mg/kg, intraperitoneally (i.p.)) or vehicle (saline, i.p.) at 1 h after return of spontaneous circulation. Thereafter, minocycline (22.5 mg/kg, i.p.) was administrated every 12 h until sacrifice. Microglial activation (evaluated by immunohistochemistry using ionized calcium-binding adapter molecule-1 (Iba1) antibody) coincided with DNA fragmentation and neurodegeneration in CA1 hippocampus and cortex (assessed by deoxynucleotidyltransferase-mediated dUTP nick-end labeling (TUNEL), Fluoro-Jade-B and Nissl stain). Minocycline significantly decreased both the microglial response and neuronal degeneration compared with the vehicle. Asphyxial CA significantly enhanced proinflammatory cytokine and chemokine levels in hippocampus versus control (assessed by multiplex bead array assay), specifically tumor necrosis factor-alpha (TNF-alpha), macrophage inflammatory protein-1alpha (MIP-1alpha), regulated upon activation, normal T-cell expressed and secreted (RANTES), and growth-related oncogene (GRO-KC) (P<0.05). Minocycline attenuated ACA-induced increases in MIP-1alpha and RANTES (P<0.05). These data show that microglial activation and cytokine production are increased in immature brain after ACA. The beneficial effect of minocycline suggests an important role for microglia in selective neuronal death after pediatric ACA, and a possible therapeutic target.
authors.affiliation: Department of Critical Care Medicine, Children's Hospital of Pittsburgh, Pittsburgh, Pennsylvania 15213, USA.
authors.forename: Minke
authors.initials: M
authors.lastname: Tang
authors.forename: Henry
authors.initials: H
authors.lastname: Alexander
authors.forename: Robert S B
authors.initials: RS
authors.lastname: Clark
authors.forename: Patrick M
authors.initials: PM
authors.lastname: Kochanek
authors.forename: Valerian E
authors.initials: VE
authors.lastname: Kagan
authors.forename: Hülya
authors.initials: H
authors.lastname: Bayir
mesh_terms: D000818:Animals; D000831:Animals, Newborn / Q000502:physiology*; D001237:Asphyxia / Q000188:drug therapy* / Q000473:pathology*; D001835:Body Weight / Q000502:physiology; D016923:Cell Death / Q000187:drug effects; D002470:Cell Survival / Q000187:drug effects; D016207:Cytokines / Q000096:biosynthesis / Q000235:genetics; D053938:DNA Fragmentation / Q000187:drug effects; D006323:Heart Arrest / Q000188:drug therapy* / Q000473:pathology*; D006624:Hippocampus / Q000473:pathology; D007150:Immunohistochemistry; D020287:In Situ Nick-End Labeling; D007249:Inflammation / Q000473:pathology; D008297:Male; D017628:Microglia / Q000187:drug effects* / Q000473:pathology; D008911:Minocycline / Q000494:pharmacology*; D009419:Nerve Tissue Proteins / Q000096:biosynthesis / Q000235:genetics; D009474:Neurons / Q000187:drug effects*; D051381:Rats; D017207:Rats, Sprague-Dawley
chemical_list: D016207:Cytokines; D009419:Nerve Tissue Proteins; D008911:Minocycline