title: Physiological, anatomical, and behavioral changes after acoustic trauma in Drosophila melanogaster.
abstract: Noise-induced hearing loss (NIHL) is a growing health issue, with costly treatment and lost quality of life. Here we establish Drosophila melanogaster as an inexpensive, flexible, and powerful genetic model system for NIHL. We exposed flies to acoustic trauma and quantified physiological and anatomical effects. Trauma significantly reduced sound-evoked potential (SEP) amplitudes and increased SEP latencies in control genotypes. SEP amplitude but not latency effects recovered after 7 d. Although trauma produced no gross morphological changes in the auditory organ (Johnston's organ), mitochondrial cross-sectional area was reduced 7 d after exposure. In nervana 3 heterozygous flies, which slightly compromise ion homeostasis, trauma had exaggerated effects on SEP amplitude and mitochondrial morphology, suggesting a key role for ion homeostasis in resistance to acoustic trauma. Thus, Drosophila exhibit acoustic trauma effects resembling those found in vertebrates, including inducing metabolic stress in sensory cells. This report of noise trauma in Drosophila is a foundation for studying molecular and genetic sequelae of NIHL.
authors.affiliation: Biology Department, University of Iowa, Iowa City, IA 52242.
authors.forename: Kevin W
authors.initials: KW
authors.lastname: Christie
authors.forename: Elena
authors.initials: E
authors.lastname: Sivan-Loukianova
authors.forename: Wesley C
authors.initials: WC
authors.lastname: Smith
authors.forename: Benjamin T
authors.initials: BT
authors.lastname: Aldrich
authors.forename: Michael A
authors.initials: MA
authors.lastname: Schon
authors.forename: Madhuparna
authors.initials: M
authors.lastname: Roy
authors.forename: Bridget C
authors.initials: BC
authors.lastname: Lear
authors.forename: Daniel F
authors.initials: DF
authors.lastname: Eberl
mesh_terms: D000161:Acoustic Stimulation; D000818:Animals; D001522:Behavior, Animal / Q000502:physiology*; D004195:Disease Models, Animal; D004331:Drosophila melanogaster; D006317:Hearing Loss, Noise-Induced / Q000503:physiopathology*; D008124:Locomotion / Q000502:physiology; D046529:Microscopy, Electron, Transmission; D053142:Mitochondrial Size / Q000502:physiology; D009474:Neurons / Q000473:pathology*; D013312:Stress, Physiological / Q000502:physiology*
keywords: Na/K ATPase; auditory courtship behavior; locomotion; mitochondria