Junko Kami

The University of Tokyo, Tōkyō, Japan

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Publications (5)11.51 Total impact

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    ABSTRACT: To investigate the role played by receptors of vascular endothelial growth factors, Flt-1 and KDR/Flk-1, on an experimental model of choroidal neovascularization (CNV). The vascular endothelial growth factor-A (VEGF-A) receptor-specific tyrosine kinase inhibitor SU5416 was administered to a laser-induced mouse model of CNV. The formation of CNV and the degree of vascular permeability in Flt-1 tyrosine kinase domain-deficient mice were also investigated. SU5416 reduced vascularity and vascular endothelial cell proliferation, and promoted endothelial cell apoptosis within CNV. Furthermore, the formation of CNV and the degree of vascular permeability were significantly reduced in Flt-1 tyrosine kinase domain-deficient mice, and this effect was enhanced by the administration of SU5416. Both Flt-1 and KDR/Flk-1 have a significant role in CNV formation. Suppression of apoptosis may be involved in the process.
    No preview · Article · Apr 2008 · Japanese Journal of Ophthalmology
  • Ryo Obata · Yasuhiro Tamaki · Yasuo Yanagi · Junko Kami
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    ABSTRACT: To develop a new device for measuring reflected light during diode-laser irradiation in transpupillary thermotherapy (TTT) and to assess the correlation between fundus pigmentation, the measured intensity of reflected light, and the increase in fundus temperature. We developed a device to measure reflected light by modifying a slit-lamp-mounted 810-nm diode-laser delivery system used clinically for TTT. The diode laser was used to irradiate test charts with various degrees of reflectance in in vitro experiments, and the fundus of nonpigmented or pigmented rabbits in in vivo experiments; then, the intensity of the reflected light and the temperature increase at the target were measured. The retinal sections were also examined histologically. There was a significant negative correlation between the intensity of the reflected light and the temperature increase in the target that depended on the degree of reflectance of the charts or the pigmentation of the rabbit eyes. On histopathologic examination, the extent of the changes in the irradiated retina after TTT was clearly different between pigmented and nonpigmented rabbits. Correlations between fundus pigmentation, the intensity of reflected light during diode-laser irradiation, and the temperature increase in TTT were demonstrated in vitro and in vivo. Our results suggest that measurement of the intensity of reflected light should be helpful for modulating the laser power in TTT according to the degree of fundus pigmentation.
    No preview · Article · Nov 2007 · Japanese Journal of Ophthalmology
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    ABSTRACT: To determine the percentage of Japanese patients with age-related macular degeneration (AMD) who are eligible for photodynamic therapy (PDT) with verteporfin who have either polypoidal choroidal vasculopathy (PCV) or choroidal neovascularization (CNV) with retinochoroidal anastomosis (RCA). The medical charts of 82 consecutive patients (83 eyes) with subfoveal CNV due to AMD were reviewed. Initially, we determined which of these eyes were eligible for PDT by using the criteria reported by two large randomized control studies, that is, the Treatment of Age-related Macular Degeneration with Photodynamic Therapy (TAP) study and the Verteporfin in Photodynamic Therapy (VIP) study. Among the PDT-eligible patients, the percentage of eyes with PCV or CNV with RCA was determined by indocyanine green angiography (ICGA). In total, 36 eyes (43%) of the 83 eyes were PDT-eligible; 17 (20%) based on the TAP study criteria, and 19 (23%) based on the VIP study criteria. Among these PDT-eligible eyes, ICGA revealed that 12 (33%) had PCV and 2 (6%) had CNV with RCA. With ICGA, PCV or CNV with RCA were recognized in a substantial proportion of cases eligible for PDT based on the two clinical studies. Considering that the treatment efficacy of PDT for PCV or RCA has not been established, detection of PCV or RCA prior to PDT with ICGA is highly recommended.
    No preview · Article · Aug 2006 · Japanese Journal of Ophthalmology

  • No preview · Article · Apr 2006 · Archives of Ophthalmology
  • Source
    T Inoue · Y Yanagi · Y Tamaki · J Kami · Y Kato

    Preview · Article · Jul 2004 · Eye