Expression pattern of oxidative stress and antioxidant defense-related genes in the aging Fischer 344/NHsd rat cochlea.
Tanaka-C; Coling-DE; Manohar-S; Chen-G-D; Hu-BH; Salvi-R; Henderson-D
Neurobiol Aging 2012 Aug; 33(8):1842.e1-1842.e14
The biological mechanisms that give rise to age-related hearing loss (ARHL) are still poorly understood. However, there is growing recognition that oxidative stress may be an important factor. To address this issue, we measured the changes in the expression of cochlear oxidative stress and antioxidant defense-related genes in young (2 months old), middle-aged (12 months old), and old (21-25 months old) Fischer 344/NHsd (F344/NHsd) rats and compared gene expression changes with ARHL. A quantitative real-time reverse transcription polymerase chain reaction array revealed a significant age-related downregulation of only 1 gene, stearoyl-coenzyme A desaturase 1, and upregulation of 12 genes: 24-dehydrocholesterol reductase; aminoadipate-semialdehyde synthase; cytoglobin; dual oxidase 2; glutathione peroxidase 3; glutathione peroxidase 6; glutathione S-transferase, kappa 1; glutathione reductase; nicotinamide adenine dinucleotide phosphate (NAD(P)H) dehydrogenase, quinone 1; solute carrier Family 38, Member 5; thioredoxin interacting protein; and vimentin. Statistical analyses revealed significant correlations between gene expression and auditory function in 8 genes. Our results identified specific subsets of oxidative stress genes that appear to play an important role in ARHL in the Fischer 344/NHsd rat.
Hearing-loss; Age-factors; Laboratory-animals; Laboratory-testing; Oxidative-processes; Genes; Ears; Antioxidants; Enzyme-activity; Enzymes; Amino-acids; Adipates; Cytochemistry; Aldehydes; Oxidative-enzymes; Thiones; Peroxidases; Nucleotides; Phosphates; Quinones; Protein-chemistry; Proteins; Auditory-system; Metabolism; Physiological-response; Physiology
Chiemi Tanaka, Oregon Hearing Research Center, Department of Otolaryngology, Mail Code NRC04, Oregon Health and Science University, 3181 SW Sam Jackson Park Road, Portland, OR 97239, USA
Neurobiology of Aging
State University of New York at Buffalo