title: Expression of c-Fos and c-Myc and deposition of beta-APP in neurons in the adult rat brain as a result of exposure to short-lasting impulse noise.
abstract: There is increasing evidence that impulse noise causes brain damage, but little is known about the mechanisms and extent of the response. Here, rat brains were investigated immunohistochemically for the expression of c-Fos, c-Myc, and beta-APP during the first 3 weeks postexposure to impulse noise of 198 or 202 dB. The expression of c-Fos and c-Myc increased at 2 h after exposure in neurons of the cerebral cortex, thalamus, and hippocampus, and this c-Fos immunoreactivity remained elevated for the entire observation period. The c-Myc immunoreactivity peaked at 18 h in both neurons and astrocytes but returned to control levels at 7 days. Abnormal deposition of beta-APP was evident within 6 h in the same brain regions. The beta-APP immunoreactivity was most prominent at 18 h and remained increased over the 21-day period assessed. The observed effects were similar to those described in humans following traumatic brain injury and in Alzheimer's disease. We conclude that impulse noise influences the brain in a fashion similar to that in cases with progressive CNS degeneration.
authors.affiliation: Department of Anatomy and Cell Biology, University of Göteborg, Sweden. annette.saljo@anatcell.gu.se
authors.forename: Annette
authors.initials: A
authors.lastname: Säljö
authors.forename: Feng
authors.initials: F
authors.lastname: Bao
authors.forename: Jingshan
authors.initials: J
authors.lastname: Shi
authors.forename: Anders
authors.initials: A
authors.lastname: Hamberger
authors.forename: Hans-Arne
authors.initials: HA
authors.lastname: Hansson
authors.forename: Kenneth G
authors.initials: KG
authors.lastname: Haglid
mesh_terms: D016564:Amyloid beta-Protein Precursor / Q000096:biosynthesis / Q000378:metabolism*; D000818:Animals; D001253:Astrocytes / Q000378:metabolism; D001921:Brain / Q000378:metabolism*; D001923:Brain Chemistry / Q000502:physiology; D001930:Brain Injuries / Q000209:etiology / Q000378:metabolism*; D002540:Cerebral Cortex / Q000378:metabolism; D005260:Female; D006624:Hippocampus / Q000378:metabolism; D017874:Immediate-Early Proteins / Q000096:biosynthesis / Q000378:metabolism*; D007150:Immunohistochemistry; D023421:Models, Animal; D009474:Neurons / Q000378:metabolism; D009622:Noise / Q000009:adverse effects; D016760:Proto-Oncogene Proteins c-fos / Q000096:biosynthesis / Q000378:metabolism*; D020598:Proto-Oncogene Proteins c-myb / Q000096:biosynthesis / Q000378:metabolism*; D051381:Rats; D017208:Rats, Wistar
chemical_list: D016564:Amyloid beta-Protein Precursor; D017874:Immediate-Early Proteins; D016760:Proto-Oncogene Proteins c-fos; D020598:Proto-Oncogene Proteins c-myb