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Biomedical subjects

S Yokoe

Publications and source records attributed to S Yokoe.

6 recordsLinked to original sources
PubMed2000

Identification of ingrowth site of idiopathic subfoveal choroidal neovascularization by indocyanine green angiography.

PURPOSE: This study aimed to determine whether indocyanine green (ICG) angiography is useful to identify the ingrowth site of idiopathic choroidal neovascularization (CNV), which can predict visual outcomes after surgical removal of idiopathic CNV. DESIGN: Consecutive, observational case series. PARTICIPANTS: Twenty-six patients with idiopathic subfoveal CNV, of whom six underwent submacular surgery. INTERVENTION: Indocyanine green videoangiography with a scanning laser ophthalmoscope. MAIN OUTCOME MEASURES: We studied ICG videoangiographic images of choroidal neovascular membranes from the early phase to the late phase with special attention to abnormal findings, which can indicate the ingrowth site of CNV. RESULTS: Early ICG angiography demonstrated distinct neovascular vessels in 24 of the 26 patients (92%). Hypofluorescent rims continuously or intermittently surrounded neovascular membranes on late ICG angiograms in 21 of the 26 patients (81%). In 22 of the 26 patients (85%), ICG angiography demonstrated hypofluorescent areas within the CNV. These hypofluorescent areas frequently became ring shaped in the middle to late phase of the ICG angiography. In 14 of 16 patients (88%) with CNV larger than half a disc area, the filling of neovascular vessels appeared from the inside of the hypofluorescent areas and branched out toward the surrounding hyperfluorescent membrane in the early phase. In all six patients who underwent surgical removal of CNV, ICG videoangiography showed these hypofluorescent areas from which neovascular vessels emanated. Three of the four surgical patients, in whom hypofluorescent areas or central fluorescent areas surrounded by ring-shaped hypofluorescence were extrafoveal or juxtafoveal, had a best postoperative visual acuity of 20/60 or better. In contrast, both surgical patients with subfoveal hypofluorescent areas had a best postoperative visual acuity of 20/70 or worse. CONCLUSIONS: Although further observations are needed, ICG angiography may be a useful adjunct in the identification of the ingrowth site of idiopathic CNV, which can predict visual outcomes after surgery.

Adult↗
PubMed1999

Surgical treatment of submacular hemorrhage associated with idiopathic polypoidal choroidal vasculopathy.

PURPOSE: To report the visual outcome of surgical treatment of submacular hemorrhage associated with idiopathic polypoidal choroidal vasculopathy. METHODS: Eight eyes of eight consecutive patients with thick submacular hemorrhages associated with idiopathic polypoidal choroidal vasculopathy were treated with pars plana vitrectomy and tissue plasminogen activator-assisted removal of subretinal blood (December 1995 to September 1997) or intravitreal 100% sulfur hexafluoride gas injection without tissue plasminogen activator (October 1997 to March 1998). RESULTS: Postoperatively, laser treatment was performed for active polypoidal lesions outside the foveal avascular zone in four eyes. A retinal pigment epithelial tear was seen outside the foveal avascular zone in three eyes, and one eye developed a retinal detachment. The best-corrected visual acuity improved (by 3 or more lines) or stabilized in seven of the eight eyes. Four eyes had a final best-corrected visual acuity of 20/40 or better, and three eyes had a final best-corrected visual acuity of 20/50 to 20/200. In one eye, the visual acuity decreased from 20/100 to 20/500 because of the development of a subfoveal neovascular membrane. The membrane was excised, and histologic examination showed fibrovascular tissue between the retina and retinal pigment epithelium (type 2 pattern). CONCLUSIONS: Surgical intervention may be of benefit in eyes with submacular hemorrhage associated with idiopathic polypoidal choroidal vasculopathy.

Aged↗
PubMed1991

[A case of lacrimal gland malignant lymphoma, associated with Sjögren's syndrome].

A 64 year-old female complained of left upper lid swelling. Painless mass lesions were found in her bilateral lacrimal gland areas. She also complained of a dry sensation in both eyes and her mouth. The rose bengal test, Schirmer's test and fluorescein dye test were positive. Lip biopsy revealed chronic sialoadenitis and rheumatoid factor titer was elevated. Anti-nuclear and anti-RNP antibodies were positive. Anti-SS-A and anti-SS-B antibodies were both negative. Left pre-and post auricular, cervical and inguinal lymph nodes were palpable. Excisional biopsies of bilateral orbital lesions and an inguinal lymph node revealed the presence of reactive lymphoid hyperplasia in the right orbit, and B cell type, diffuse, large cell lymphoma, in the left orbit and inguinal lymph node. Intensive chemotherapy resulted in complete remission. Lacrimal gland lymphoma must be considered when examining cases of Sjogren's syndrome.

Eye Neoplasms↗
PubMed1983

Cross-linking of tobacco mosaic virus RNA and capped polyribonucleotides to 18S rRNA in wheat germ ribosome-mRNA complexes.

Tobacco mosaic virus RNA, forming 40S or 80S initiation complexes with wheat germ ribosomes, was covalently bound to 18S ribosomal RNA by the photoreaction with an RNA cross-linking agent, 4'-aminomethyl-4,5',8-trimethylpsoralen (AMT). Synthetic polyribonucleotide, poly(A, U), with the cap structure m7GpppGmC at the 5'-terminal was also cross-linked to 18S ribosomal RNA in 40S or 80S complexes with ribosomes by the AMT photoreaction. Polyuridylic acid with the same 5'-cap structure, forming 40S complexes but not 80S complexes with ribosomes, was most efficiently cross-linked to 18S ribosomal RNA by the psoralen photoreaction. These results suggest that the interactions between mRNA and 18S rRNA are not necessarily of strict complementarity but occur during formation of the complexes in eukaryotes. The 40S complexes would be then converted to 80S complexes in the presence of the AUG initiation codon or AUG-like triplets containing A and U on the polyribonucleotide chains which interact with 18S ribosomal RNA.

Cross-Linking Reagents↗
PubMed1981

Increased proportion of medium chain fatty acids in nystatin-resistant yeast mutants.

Fatty acid composition of phospholipids and steryl esters from four nystatin-resistant mutants of Saccharomyces cerevisiae was compared to that from the wild strain. All the mutant strains which produce several ergosterol intermediates incorporated two- to three-fold as much medium chain fatty acids, especially 14:1 in phospholipids, and 12:0, 14:0 and 14:1 in steryl esters as the wild strain did. The increase in the relative amount of medium chain fatty acids in these mutants was found at all the growth temperatures and the growth phases examined, and in all the phospholipid species.

Cell Division↗