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Expression of heat shock transcription factors and heat shock protein 72 in rat retina after intravitreal injection of low dose N-methyl-D-aspartate.

Authors
Ahn, J; Piri, N; Caprioli, J; Munemasa, Y; Kim, SH; Kwong, JM
Citation
Neuroscience letters, 433(1):11-16, 2008
Journal Title
Neuroscience letters
ISSN
0304-39401872-7972
Abstract
The heat shock response is a genetically well-ordered process for cell to generate heat shock protein (HSP). Various stressors can trigger the response through heat shock transcriptional factor (HSF) regulation. Recent studies demonstrated that preconditioning of N-methyl-d-aspartate (NMDA) at non-lethal levels has neuroprotective effects, but the exact mechanisms are unclear. We hypothesize that the protective mechanisms of NMDA preconditioning could involve HSP expression. To understand the regulatory mechanisms of HSP under stress, we examined the expression of Hsp72, HSF1 and HSF2 in the adult rat retina after intravitreal injection of NMDA. Retinal ganglion cell (RGC) counting with retrograde labeling showed that 8 nmol, but not 0.8 nmol, of intravitreal NMDA reduced RGC survival. Western blotting and immunohistochemistry showed that non-lethal (0.8 nmol) doses of NMDA induced a time-dependent expression of HSF1 and HSF2, and that the expression of HSF1 and HSF2 in the RGC layer peaked between 9 and 18 h after injection. Parallel to the increased HSF expression, immunohistochemistry and in situ hybridization demonstrated that Hsp72 mRNA and protein expression increased 9 and 12 h after non-lethal NMDA injection, respectively. Our findings suggest that the expression of HSF1 and HSF2 is associated with the Hsp72-related stress response.
MeSH terms
AnimalsCell Survival/drug effectsCell Survival/physiologyCytoprotection/drug effectsCytoprotection/physiology*DNA-Binding Proteins/drug effectsDNA-Binding Proteins/metabolism*Dose-Response Relationship, DrugExcitatory Amino Acid Agonists/pharmacologyGene Expression Regulation/drug effectsGene Expression Regulation/physiologyHSP72 Heat-Shock Proteins/drug effectsHSP72 Heat-Shock Proteins/metabolism*Heat-Shock Proteins/drug effectsHeat-Shock Proteins/metabolismHeat-Shock Response/drug effectsHeat-Shock Response/physiology*ImmunohistochemistryMaleN-Methylaspartate/pharmacologyNeuroprotective Agents/pharmacologyRNA, Messenger/drug effectsRNA, Messenger/metabolismRatsRats, WistarRetina/drug effectsRetina/metabolism*Retina/physiopathologyRetinal Ganglion Cells/drug effectsRetinal Ganglion Cells/metabolismStress, Physiological/chemically inducedStress, Physiological/metabolism*Stress, Physiological/physiopathologyTime FactorsTranscription Factors/drug effectsTranscription Factors/metabolism*Up-Regulation/drug effectsUp-Regulation/physiologyVitreous Body/drug effects
DOI
10.1016/j.neulet.2007.12.045
PMID
18242848
Appears in Collections:
Journal Papers > School of Medicine / Graduate School of Medicine > Ophthalmology
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