title: Increased phosphorylation of Ets-like transcription factor-1 in neurons of hypoxic preconditioned mice.
abstract: Ets-like transcription factor-1 (Elk-1) is a target of mitogen activated protein kinase (MAPK) which has been reported to play a key role in the induction of tolerance to ischemic and hypoxic injury, but little is known about the role of Elk-1 in the development of cerebral hypoxic preconditioning (HPC). In this study, we found that Elk-1 phosphorylation at Ser383 (p-Ser383 Elk-1), not protein expression, increased significantly (P < 0.05) in both hippocampus and frontal cortex of mice after repetitive auto-hypoxia exposures from 1 to 6 times (H1-H6, n = 6 for each group) when compared to that of the normoxic control group (H0, n = 6). The enhanced p-Ser383 Elk-1 was also found in the nuclear extract of H3 mice brain. Similarly, increased p-Ser383 Elk-1 was observed by immunostaining in the hippocampus and frontal cortex of mice from H3 and H6 groups. In addition, we found that the increased p-Ser383 Elk-1 co-localized with a neuron-specific protein, neurogranin, in the brain of H3 mice by using double immunofluorescence labeling. These results suggested that the enhanced neuron-specific phosphorylation of Elk-1 at Ser383 is involved in cerebral HPC of mice.
authors.affiliation: Department of Neurobiology and Beijing Institute for Neuroscience, Capital Medical University, #10 You An Men Wai Xi Tou Tiao, 100069 Beijing, China.
authors.forename: Jun
authors.initials: J
authors.lastname: Jiang
authors.forename: Weiwei
authors.initials: W
authors.lastname: Yang
authors.forename: Ping
authors.initials: P
authors.lastname: Huang
authors.forename: Xiangning
authors.initials: X
authors.lastname: Bu
authors.forename: Nan
authors.initials: N
authors.lastname: Zhang
authors.forename: Junfa
authors.initials: J
authors.lastname: Li
mesh_terms: D000818:Animals; D015153:Blotting, Western; D002540:Cerebral Cortex / Q000187:drug effects / Q000378:metabolism; D004591:Electrophoresis, Polyacrylamide Gel; D005455:Fluorescent Antibody Technique; D006624:Hippocampus / Q000187:drug effects / Q000378:metabolism; D000860:Hypoxia / Q000378:metabolism* / Q000503:physiopathology; D007150:Immunohistochemistry; D008297:Male; D051379:Mice; D008807:Mice, Inbred BALB C; D051579:Neurogranin / Q000378:metabolism; D009474:Neurons / Q000378:metabolism*; D010766:Phosphorylation; D050807:ets-Domain Protein Elk-1 / Q000096:biosynthesis / Q000378:metabolism*
chemical_list: D050807:ets-Domain Protein Elk-1; D051579:Neurogranin