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    Osteopontin is not Critical for Otoconia Formation or Balance Function

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    Author
    Zhao, Xing; Jones, Sherri M.; Thoreson, Wallace B.; Lundberg, Yunxia Wang
    Abstract
    Unlike the structural and mechanical role of bone crystals, the inertial mass of otoconia crystals provides a shearing force to stimulate the mechanoreceptors of the utricle and saccule (the gravity receptor organ)under the stimuli of linear motion. It is not clear whether otoconia, composed primarily of CaCO3 and glycoproteins, go through similar calcification processes as bone. We have recently shown that otoconin-90 (Oc90) regulates the growth of otoconia crystals as osteopontin does bone crystals. Here, we analyzed the role of this non-collagenous bone matrix protein, osteopontin, in otoconia formation and balance function utilizing its knockout mice, whose inner ear phenotype has not been examined. Despite the presence of the protein in wild-type otoconia and vestibular hair cells, morphological, ultrastructural, and protein and calcium composition analyses of osteopontin null otoconia show that the protein is not needed for crystal formation, and no evidence of compensatory protein deposition is found. Employment of a wide spectrum of balance behavioral tests demonstrates that the protein is not critical for balance function either, which is confirmed by the normal function of the gravity receptor organ directly measured with linear vestibular-evoked potentials (VsEPs). When compared with findings on other otoconins, the data manifest a hierarchy of importance of proteins in crystallization and indicate mechanistic similarities and differences between bone and otoconia calcification. Originally published J Assoc Res Otolaryngol, Vol. 9, No. 2, June 2008
    URI
    http://hdl.handle.net/10342/3103
    Subject
     Balance behaviors; Calcification; Vestibular evoked potentials; Bones 
    Date
    2008-06
    Citation:
    APA:
    Zhao, Xing, & Jones, Sherri M., & Thoreson, Wallace B., & Lundberg, Yunxia Wang. (June 2008). Osteopontin is not Critical for Otoconia Formation or Balance Function. Journal of the Association for Research in Otolaryngology, 9(2), 191- 201. Retrieved from http://hdl.handle.net/10342/3103

    Display/Hide MLA, Chicago and APA citation formats.

    MLA:
    Zhao, Xing, and Jones, Sherri M., and Thoreson, Wallace B., and Lundberg, Yunxia Wang. "Osteopontin is not Critical for Otoconia Formation or Balance Function". Journal of the Association for Research in Otolaryngology. 9:2. (191-201), June 2008. September 26, 2023. http://hdl.handle.net/10342/3103.
    Chicago:
    Zhao, Xing and Jones, Sherri M. and Thoreson, Wallace B. and Lundberg, Yunxia Wang, "Osteopontin is not Critical for Otoconia Formation or Balance Function," Journal of the Association for Research in Otolaryngology 9, no. 2 (June 2008), http://hdl.handle.net/10342/3103 (accessed September 26, 2023).
    AMA:
    Zhao, Xing, Jones, Sherri M., Thoreson, Wallace B., Lundberg, Yunxia Wang. Osteopontin is not Critical for Otoconia Formation or Balance Function. Journal of the Association for Research in Otolaryngology. June 2008; 9(2): 191-201. http://hdl.handle.net/10342/3103. Accessed September 26, 2023.
    Collections
    • Communication Sciences and Disorders
    Publisher
    East Carolina University

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