Affiliations: [a] Department of Otolaryngology and Sensory Organ Surgery, Osaka University Graduate School of Medicine, Suita, Osaka, Japan | [b] Department of Otorhinolaryngology, Hyogo College of Medicine, Nishinomiya, Hyogo, Japan
Note: [*] Correspondence to Arata Horii, MD/PhD; Department of Otolaryngology and Sensory Organ Surgery, Osaka University Graduate School of Medicine, Suita, Osaka 565-0871, Japan. Tel.: +81 6 6879 3951; Fax: +81 6 6879 3959; E-mail: [email protected]
Abstract: Recovery from balance disorders after spaceflight is supposed to reflect the process of readaptation to normal gravitational environment (1G) from microgravity. Linear acceleration including gravity is perceived by otolith pathways, therefore, it could be assumed that possible plastic changes in any part of otolithic pathways from the level of the vestibular periphery to the central vestibular system might be responsible for adaptive mechanisms to an altered gravitational environment. In the present study, to elucidate a role of otoconia in adaptation to altered gravity, we examined the effects of hypergravity (2G) on morphology and synthesis of saccular and utricular otoconia in young adult rats. Morphology of otoconia was examined by scanning electron microscopy. Otoconial synthesis was assessed by mRNA expression of osteopontin, a matrix protein of otoconia, in otolithic maculae as a marker of otoconial genesis determined by a real-time quantitative PCR method. The present results showed that neither otoconial morphology nor otoconial synthesis was affected by up to one week exposure to hypergravity. These findings suggest that changes in neurotransmission at the synapses of the peripheral and/or central vestibular system rather than the changes in otoconial morphology and synthesis may be involved in adaptive mechanisms to an altered gravitational environment.
Keywords: adaptation, gravity, osteopontin, otolith organs, PCR, space
