121 361

Cited 16 times in

Astrogliosis is a possible player in preventing delayed neuronal death.

Jeong, HK; Ji, KM; Min, KJ; Choi, I; Choi, DJ; Jou, I; Joe, EH
Molecules and cells, 37(4):345-355, 2014
Journal Title
Molecules and cells
Mitigating secondary delayed neuronal injury has been a therapeutic strategy for minimizing neurological symptoms after several types of brain injury. Interestingly, secondary neuronal loss appeared to be closely related to functional loss and/or death of astrocytes. In the brain damage induced by agonists of two glutamate receptors, N-ethyl-D-aspartic acid (NMDA) and kainic acid (KA), NMDA induced neuronal death within 3 h, but did not increase further thereafter. However, in the KA-injected brain, neuronal death was not obviously detectable even at injection sites at 3 h, but extensively increased to encompass the entire hemisphere at 7 days. Brain inflammation, a possible cause of secondary neuronal damage, showed little differences between the two models. Importantly, however, astrocyte behavior was completely different. In the NMDA-injected cortex, the loss of glial fibrillary acidic protein-expressing (GFAP+) astrocytes was confined to the injection site until 7 days after the injection, and astrocytes around the damage sites showed extensive gliosis and appeared to isolate the damage sites. In contrast, in the KA-injected brain, GFAP+ astrocytes, like neurons, slowly, but progressively, disappeared across the entire hemisphere. Other markers of astrocytes, including S100β, glutamate transporter EAAT2, the potassium channel Kir4.1 and glutamine synthase, showed patterns similar to that of GFAP in both NMDA- and KA-injected cortexes. More importantly, astrocyte disappearance and/or functional loss preceded neuronal death in the KA-injected brain. Taken together, these results suggest that loss of astrocyte support to neurons may be a critical cause of delayed neuronal death in the injured brain.
MeSH terms
AnimalsAstrocytes/drug effectsAstrocytes/physiologyBiological Markers/metabolismBrain Injuries/drug therapyCell Communication/drug effectsCell Death*/drug effectsCerebral Cortex/drug effectsExcitatory Amino Acid Transporter 2/metabolismGlial Fibrillary Acidic Protein/metabolismGliosis/drug therapyGlutamate-Ammonia Ligase/metabolismKainic Acid/administration & dosageMaleN-Methylaspartate/administration & dosageNeurons/drug effectsNeurons/physiologyPotassium Channels, Inwardly Rectifying/metabolismRatsRats, Sprague-DawleyReceptors, Glutamate/metabolismS100 Calcium Binding Protein beta Subunit/metabolism
Appears in Collections:
Journal Papers > School of Medicine / Graduate School of Medicine > Pharmacology
AJOU Authors
주, 일로조, 은혜
Full Text Link
Files in This Item:
RIS (EndNote)
XLS (Excel)


해당 아이템을 이메일로 공유하기 원하시면 인증을 거치시기 바랍니다.

Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.