Expression of aquaporin 1 and 5 in the developing mouse inner ear and audiovestibular assessment of an Aqp5 null mutant.
To examine the potential roles of aquaporins 1 and 5 (AQP1 and AQP5, respectively) in inner ear development and function, we defined their spatial and temporal expression patterns in the developing mouse inner ear and examined the morphologic and physiologic effects of loss of Aqp5 function. Standard in situ hybridization (ISH) and immunohistochemical (IHC) assays were used for expression studies with routine morphologic, behavioral, and physiologic assessments of hearing and balance in Aqp5 null mutant mice. AQP1 was first detected at embryonic day 10.5 (E10.5) in the otocyst but eventually localized to specific nonsensory portions of the inner ear and connective tissue cells surrounding the membranous labyrinth. AQP5 displayed specific cochlear expression, first detectable at E15.5 in the nonsensory epithelium and later restricted to the lateral wall of the cochlear duct near the spiral prominence. AQP5 expression continued through postnatal periods with a change of expression domain to the stria vascularis between postnatal day 7 (P7) and P14. By in situ hybridization and immunohistochemical techniques, subtle differences between transcript and protein expression patterns were noted for both AQP1 and 5. Although AQP5 is dynamically expressed in the developing mouse inner ear, adult Aqp5 knockout mice show normal hearing when tested and normal inner ear structural development. These results suggest redundant or alternative mechanisms that likely regulate water homeostasis in the developing and mature inner ear.
Merves
Michele
M
Department of Pediatric Otolaryngology, Center for Hearing and Deafness Research, Cincinnati, OH 45229, USA.
Krane
Carissa M
CM
Dou
Hongwei
H
Greinwald
John H
JH
Menon
Anil G
AG
Choo
Daniel
D
D000375:Aging / Q000378:metabolism*; D000818:Animals; D000831:Animals, Newborn / Q000254:growth & development / Q000378:metabolism; D051398:Aquaporin 1; D051402:Aquaporin 5; D020346:Aquaporins / Q000172:deficiency / Q000378:metabolism*; D001522:Behavior, Animal; D007758:Ear, Inner / Q000196:embryology* / Q000378:metabolism* / Q000473:pathology / Q000503:physiopathology; D004622:Embryo, Mammalian / Q000378:metabolism; D005314:Embryonic and Fetal Development; D016057:Evoked Potentials, Auditory, Brain Stem; D006309:Hearing; D008565:Membrane Proteins; D051379:Mice; D008815:Mice, Inbred Strains; D018345:Mice, Knockout
C496021:Aqp1 protein, mouse; C496038:Aqp5 protein, mouse; D051402:Aquaporin 5; D020346:Aquaporins; D008565:Membrane Proteins; D051398:Aquaporin 1