Publications by authors named "Toshihiko Kikuchi"

Background: Amyotrophic lateral sclerosis (ALS) is an intractable progressive disease, with an incidence of 2.2- 2.3 per 100,000 individuals, which is not extremely low.

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Conclusion: Immunolocalization of the subtypes of water channel proteins, aquaporins (AQPs), was detected in the mouse eustachian tube (ET). AQPs are located continuously from the serous glands and the capillary vessels to the luminal side in the ET epithelium and may play an important role in the transportation of water to the surface of the ET lumen through the epithelium.

Objectives: Although the water supply to the surface of the ET lumen is considered to be essential for closing of the ET, the pathway of the water in the ET is not fully understood.

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Mammalian pigment cells produce melanin as the main pigment. Melanocytes, one of the two types of mammalian pigment cells, differentiate from the neural crest and migrate to a variety of organs during development. Melanocytes exist not only in the skin but also in other sites such as the cochlea where they are essential for hearing.

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Numerous studies have been conducted on memory aids for memory-impaired people. However, it is not known how they use these memory aids in a functional, practical way. A 20-year-old patient (MH) was monitored for five years to identify what memory aids or other means she used and how she used them to compensate for her memory problems, e.

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We previously reported the isolation of a novel subtype of SRV/D-Tsukuba (SRV/D-T) from two cynomolgus monkeys (Macaca facicularis) in the breeding colony of Tsukuba Primate Research Center (TPRC). We surveyed for SRV/D infection in the TPRC cynomolgus colony using SRV/D-specific PCR primer sets designed based on the entire gag region sequence. The only SRV/D subtype detected in the colony was SRV/D-T with a positive infection rate of 22.

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To develop a microsatellite marker set applicable to genome-wide screening of cynomolgus monkeys (Macaca fascicularis), 148 microsatellite markers were selected from the human genome database. The polymorphisms and inheritance of PCR products were determined by screening twenty unrelated monkeys and by analysis of three families, respectively. As a result, 106 primers (72%) gave PCR products of the size expected for humans and rhesus monkeys.

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Several studies have suggested there is a developmental link between executive functions and theory of mind. However, the developmental order driving the relationship is not well understood. The main reason is that the development of executive function parallels the development of theory of mind in normally developing children.

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The exogenous simian type D retroviruses (SRV/Ds) are prevalent in macaque monkeys and sometimes cause immunodeficiency with anemia, weight loss, and persistent unresponsive diarrhea. SRV/D isolates are classified as subtypes 1 to 6, and the entire sequences of the gag region of SRV/D-1, -2, and -3 and SRV/D-Tsukuba (SRV/D-T) have been determined. We designed specific primers in the gag region of SRV/D-T that enabled us to directly detect by polymerase chain reaction (PCR) SRV/D-T proviral DNA sequences in DNA extracted from whole blood.

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Exogenous type D simian retroviruses (SRV/D) are prevalent in captive and feral populations of various macaque monkeys. Thus far, five subtypes of SRV/Ds have been reported, three of which (SRV-1, -2 and -3) have been molecularly characterized. Two SRV/D strains (N27 and T150) were isolated from seropositive cynomolgus macaques at the Tsukuba Primate Center (TPC) in Japan, showing clinical signs of SRV/D infection, including anemia and persistent unresponsive diarrhea.

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Objective: To examine the effects of gap junction blockers on the endocochlear potential (EP) and endolymphatic potassium concentration ([K(+)](e)).

Material And Methods: The EP and [K(+)](e) were monitored using double-barreled ion-selective microelectrodes in the second turn of the guinea pig cochlea during perilymphatic perfusion.

Results: When the perilymphatic scalae of the cochlea were perfused with artificial perilymph containing 10 mM n-heptanol the EP was decreased by -8.

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The immunohistochemical localization of glutamate transporter GLAST in the developing mouse cochlea was studied at different ages between 0 and 30 days after birth (DAB). In the adult mouse cochlea, intense GLAST-like immunoreactivity was found in the supporting cells adjacent to the inner hair cells of the organ of Corti, the type II and suprastrial fibrocytes of the cochlear lateral wall, the fibrocytes of the spiral limbus and the satellite cells surrounding the spiral ganglion cells. At 0 DAB, weak GLAST-like immunoreactivity was found in the supporting cells around the immature inner hair cells.

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Objective: One of the common complications of acute infection of the paranasal sinus is cellulitis of the orbit. This is secondary to the spread of infection through the very thin bony wall between the ethmoid sinuses and the orbit, the roof of the orbit in frontal sinusitis, and the floor of the orbit in maxillary sinusitis. When the infection does not penetrate the periorbita, it dissects under the periosteum and forms subperiosteal abscess.

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Cholesterol granuloma is usually associated with middle ear disease and is very rare in the paranasal sinuses. We report a case of cholesterol granuloma originating in the maxillary sinus of a 52-year-old female. Endoscopic sinus surgery was performed on the left maxillary sinus, and the cholesterol granuloma was successfully removed by the middle meatal antrostomy.

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The species-specific difference of the immunohistochemical localization of aquaporin-1 (AQP1) and aquaporin-4 (AQP4) was investigated in the cochleae of the 3 different species of rodents, including guinea pig, mouse and Mongolian gerbil. In the guinea pig cochlea, intense AQP1-like immunoreactivity was present in the type III fibrocytes in the spiral ligament and the mesenchymal cells just below the basilar membrane. Immunostaining was also found in some type IV fibrocytes in the spiral ligament, fibrocytes in the spiral limbus and mesenchymal cells lining the perilymphatic space against the bony otic capsule.

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Recently, we reported that homozygous males and females of a mouse model of DFN3 non-syndromic deafness generated by the deletion of Brn-4 transcription factor showed profound deafness due to severe alterations in the cochlear spiral ligament fibrocytes from the age of 11 weeks, whereas no hearing loss was recognized in young female heterozygotes. It is known that a part of obligate female carriers of DFN3 showed progressive hearing loss. In the present study, we examined the late-onset effect of Brn-4 deficiency on the hearing organ of the mouse.

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The reaction of [Cu(acpa)](+) with [MO(4)](2)(-) (Hacpa = N-(1-acetyl-2-propyridene)(2-pyridylmethyl)amine and M = Cr and Mo) in water-methanol or water-acetonitrile solution affords dinuclear copper(II) complexes with metalate bridges, [{Cu(acpa)}(2)(&mgr;-CrO(4))].4CH(3)OH.4H(2)O (1) and [{Cu(acpa)}(2)(&mgr;-MoO(4))].

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