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Kon T, Ishihara N, Kamimura T, Tanaka R, Ito J, Horikawa Y, Saito I. Unusual MRI findings of hypertrophic pachymeningitis with irregular dural thickening and severe brain oedema. ACTA ACUST UNITED AC 2004. [DOI: 10.1016/j.ejrex.2004.01.003] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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127
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Konishi Y, Sato E, Shimada A, Shiokawa Y, Saito I, Kimura Y. Newly developed embolic material mesosphere and titanium. Experimental and clinical studies. Interv Neuroradiol 2004; 10 Suppl 1:35-8. [PMID: 20587269 DOI: 10.1177/15910199040100s103] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/10/2004] [Accepted: 01/20/2004] [Indexed: 10/20/2022] Open
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128
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Kobayashi S, Shibata H, Kurihara I, Yokota K, Suda N, Saito I, Saruta T. Ubc9 interacts with chicken ovalbumin upstream promoter-transcription factor I and represses receptor-dependent transcription. J Mol Endocrinol 2004; 32:69-86. [PMID: 14765993 DOI: 10.1677/jme.0.0320069] [Citation(s) in RCA: 31] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
Abstract
Chicken ovalbumin upstream promoter-transcription factors (COUP-TFs) are orphan receptors involved in regulation of neurogenesis and organogenesis. COUP-TF family members are generally considered to be transcriptional repressors and several mechanisms have been proposed to underlie this activity. To explore novel transcriptional coregulators for COUP-TFs, we used the COUP-TFI as bait in a yeast two-hybrid screen of an adrenocortical adenoma cDNA library. We have identified Ubc9, a class E2 conjugating enzyme of small ubiquitin-related modifier (SUMO)-1 as a COUP-TFI corepressor. Ubc9 interacts with COUP-TFI in yeast and in glutathione S-transferase pulldown and coimmunoprecipitation assays. Fluorescence imaging studies show that both Ubc9 and COUP-TFI are colocalized in the nuclei of transfected COS-1 cells. The C-terminal region of Ubc9 encoding amino acids 59-158 interacts with the C-terminus of COUP-TFI encoding amino acids 383-403, in which transcriptional repression domains are located. Mammalian one-hybrid assays utilizing a variety of Ubc9 fragments fused to Gal4 DNA-binding domain show that a Ubc9 fragment encoding amino acids 1-89 contains autonomous transferrable repression domain. Transfection of Ubc9 into COS-1 cells markedly enhances transcriptional repression by Gal4 DNA-binding domain-fused to COUP-TFI(155-423), but not by Gal4-COUP-TFI(155-388) which lacks a repressor domain. Coexpression of a C-terminal deletion mutant of Ubc9(1-58), which fails to interact with COUP-TFI, but retains a transcriptional repression domain, has no effect on Gal4-COUP-TFI-mediated repression activity. These findings indicate that interaction of Ubc9 with COUP-TFI is crucial for the corepressor function of Ubc9. Overexpression of Ubc9 similarly enhances COUP-TFI-dependent repression of the promoter activity of the bovine CYP17 gene encoding steroid 17alpha-hydroxylase. In addition, the C93S mutant of Ubc9, which abrogates SUMO-1 conjugation activity, continues to function as a COUP-TFI corepressor. Our studies indicate that Ubc9 functions as a novel COUP-TFI corepressor, the function of which is distinct from its SUMO-1 conjugating enzyme activity.
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Abstract
An extremely rare hamartomatous lesion of the juxtaoral organ of Chievitz (JOOC) in a 63 year old man is reported. The tumour appeared as a large mass in the infratemporal fossa with associated mandibular bone resorption; histologically, it was well encapsulated and composed of numerous tangled masses of benign squamous epithelial nests and mature fibrofatty tissue. There were no histological features suggestive of neoplastic transformation. A literature survey confirmed that this is the first adult case of JOOC presenting clinically as an extraoral tumour.
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130
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Bando T, Iida H, Saito I, Sugiyama H. The synthesis of pyrrole(Py)/imidazole(Im) polyamide CPI conjugates which possess DNA interstrand cross-linking activity. NUCLEIC ACIDS SYMPOSIUM SERIES 2003:45-6. [PMID: 12903260 DOI: 10.1093/nass/44.1.45] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Abstract
Covalent dimers of ImPyLDu86 with various linkers were synthesized and their DNA interstrand cross-linking abilities were examined. Denaturing polyacrylamide gel electrophoresis indicated that dimer molecule with tetramethylene linker efficiently produced interstrand cross-link only in the presence of appropriate partner PyIm triamides.
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131
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Tanabe K, Yoshida K, Dohno C, Okamoto A, Saito I. Control of electron transfer in DNA by peptide nucleic acids (PNA). NUCLEIC ACIDS SYMPOSIUM SERIES 2003:35-6. [PMID: 12903255 DOI: 10.1093/nass/44.1.35] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
The one-electron oxidation of PNA-DNA hybrid containing G-triplet sequence was examined. In DNA duplex G-triplet was selectively cleaved by oxidation, whereas in PNA-DNA hybrid cleavage efficiency was extremely lowered. These result suggested that cleavage efficiency of PNA-DNA hybrid was different from that of B-form DNA duplex.
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132
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Bando T, Narita A, Saito I, Sugiyama H. Molecular design of hairpin imidazole-pyrrole polyamide for effective DNA alkylation. NUCLEIC ACIDS RESEARCH. SUPPLEMENT (2001) 2003:225-6. [PMID: 12836346 DOI: 10.1093/nass/1.1.225] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/14/2022]
Abstract
A new type of hairpin polyamide-CPI conjugate possessing a vinyl linker has been synthesized. Sequence-selective alkylation of double-stranded DNA by conjugates was investigated by high resolution denaturing gel electrophoresis using 450 bp DNA fragments. Highly-efficient DNA alkylation predominantly occurs at the purines of 5'-(A/T)G(T/A)CPu-3' site at nanomolar concentration.
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133
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Fujimoto K, Ogawa N, Matsuda S, Saito I. Template directed DNA photoligation via substituted 2'-deoxyuridine. NUCLEIC ACIDS RESEARCH. SUPPLEMENT (2001) 2003:185-6. [PMID: 12836326 DOI: 10.1093/nass/1.1.185] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/14/2022]
Abstract
An efficient and reversible template-directed photoligation of oligodeoxynucleotides (ODNs) using 5-carboxyvinyldeoxyuridine (CVU) was described. We have also demonstrated about photochemical synthesis of circularized DNA and padlocking plasmid DNA via CVU mediated photoreaction.
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134
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Dohno C, Nakatani K, Saito I. Modulation of DNA-mediated hole transport efficiency by DNA-protein complex formation. NUCLEIC ACIDS RESEARCH. SUPPLEMENT (2001) 2003:15-6. [PMID: 12836241 DOI: 10.1093/nass/1.1.15] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/14/2022]
Abstract
To investigate how protein interactions to DNA affects DNA-mediated hole transport, hole transport through the DNA bound to restriction endonuclease BamHI was examined. The DNA bound to BamHI retains a regular B-DNA type of conformation, but have a number of hydrogen bonding interaction. These hydrogen bondings in BamHI-DNA complex suppressed the guanine oxidation and the hole transport in sequence selective manner.
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136
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Ide F, Mishima K, Saito I. Cystadenocarcinoma in the maxillary sinus with high-grade carcinoma component. Histopathology 2003; 43:95-7. [PMID: 12823719 DOI: 10.1046/j.1365-2559.2003.01621.x] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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137
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Hirooka M, Yoshimura A, Saito I, Ikawa F, Uemoto Y, Koto S, Takabatake A, Taniguchi A, Shinoda Y, Morinaga A. Glycosylation Using Hemiacetal Sugar Derivatives: Synthesis ofO-α-D-Rhamnosyl-(1→3)-O-α-D-rhamnosyl-(1→2)-d-rhamnose andO-α-D-Tyvelosyl-(1→3)-O-α-D-mannosyl-(1→4)-L-rhamnose. BULLETIN OF THE CHEMICAL SOCIETY OF JAPAN 2003. [DOI: 10.1246/bcsj.76.1409] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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138
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Konishi Y, Sato E, Shimada M, Hino K, Fujitsuka M, Saito I. Endovascular surgery for intracranial aneurysm. Histopathological analysis after embolization using balloon or coil. Interv Neuroradiol 2003; 9:63-8. [PMID: 20591232 DOI: 10.1177/15910199030090s108] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/30/2003] [Accepted: 02/06/2003] [Indexed: 11/15/2022] Open
Abstract
SUMMARY Recently, endovascular surgery became common approach for management of intracranial aneurysms. Though its efficacy, this approach is still new and under development. Here, we report our clinical experience in patients treated with two methods - balloon or Gugliemi detachable coil. In addition, to understand better the mechanisms underlying postoperative complications, we studied them in histopathological specimens of patients and in a model of experimental aneurysm. From our data we conclude that choice of appropriate therapeutic method should respect specific conditions of patients as well as of facility. Careful postoperative studies including examination of intravascular surface by endovascular scope examination would be useful for prediction of possible complications.
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139
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Tsumura Y, Ishimitsu S, Saito I, Sakai H, Tsuchida Y, Tonogai Y. Estimated daily intake of plasticizers in 1-week duplicate diet samples following regulation of DEHP-containing PVC gloves in Japan. FOOD ADDITIVES AND CONTAMINANTS 2003; 20:317-24. [PMID: 12775472 DOI: 10.1080/0265203031000122021] [Citation(s) in RCA: 46] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
Abstract
Duplicate hospital diet samples obtained over 1 week in 2001 were analysed to estimate the daily intake of plasticizers and the results were compared with those obtained in 1999. The plasticizers quantified in this study were: dibutyl phthalate, butylbenzyl phthalate (BBP), di(2-ethylhexyl) phthalate (DEHP), diisononyl phthalate (DINP), di(2-ethylhexyl) adipate (DEHA), diisononyl adipate (DINA) and O-acetyl tributyl citrate (ATBC). Dipropyl, dipentyl, dihexyl and dicyclohexyl phthalate were also analysed but not detected. The analytical procedure for this follow-up study was essentially the same as in the previous one. Detection limits were 0.1-15.6 ng g(-1) for each plasticizer. One-week duplicate diet samples provided by three hospitals in three remote prefectures of Japan were analysed as individual meals. DEHP was detected at 6-675 ng g(-1) in 62 of 63 meals, significantly lower levels compared with those detected in 1999. Levels of DEHA and DINP also decreased. The mean intake of plasticizers estimated from all samples was 160 microg DEHP day(-1), 12.5 microg DEHA day(-1), 4.7 microg DINP day(-1) and 3.4 microg BBP day(-1). Levels of DINA were relatively high in meals from one hospital: in those meals, the average daily intake was 1338 microg day(-1). Those of ATBC were also higher in meals from another hospital: the average daily intake was 1228 microg day(-1). The sources of DINA and ATBC can be cling-film or sausage packaging.
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140
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141
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Okamoto E, Inoue T, Watanabe K, Hashimoto T, Iwazawa E, Abe Y, Chinzei T, Isoyama T, Kobayashi S, Saito I, Sato F, Matsuki H, Imachi K, Mitamura Y. Development of an implantable high-energy and compact battery system for artificial heart. Artif Organs 2003; 27:184-8. [PMID: 12580777 DOI: 10.1046/j.1525-1594.2003.t01-1-06993.x] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
The purpose of this study was to demonstrate the feasibility of the use of an implantable, high-energy, and compact battery system for an undulation pump total artificial heart (UPTAH). The implantable battery system tested consists of six lithium-ion batteries in series, a charge unit, and a charge/discharge control unit. A lithium-ion battery is currently the best energy-storage device because it has more energy density, a better life cycle, and a smaller temperature rise than those of other secondary batteries. The performance of the implantable battery system was evaluated in an in vitro experiment using an electric load that simulated the UPTAH. Also, sufficiently reliable operation of a system for supplying energy to a UPTAH consisting of a transcutaneous energy transmission system (TETS) and an implantable battery system was confirmed in three experiments using goats. The results of the in vitro and in vivo experiments showed that the implantable battery system supplied sufficient current to the UPTAH for maintenance of physiological conditions in the goat with maximum rise in temperature to less than 43 degrees C.
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142
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Kawano S, Isoyama T, Kobayashi S, Arai H, Takiura K, Saito I, Chinzei T, Abe Y, Yambe T, Nitta S, Imachi K, Hashimoto H. Miniature vibrating flow blood pump using a cross-slider mechanism for external shunt catheter. Artif Organs 2003; 27:73-7. [PMID: 12534716 DOI: 10.1046/j.1525-1594.2003.07186.x] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
The prototype of the miniature vibrating flow pump (VFP) is developed for the external shunt catheter. The cross-slider mechanism is applied to vibrate the tube, which causes the pumping effect. This mechanism results in successful development of the miniature and lightweight VFP. By the use of the prototype VFP, the experiment of the basic pump performance is made in detail based on the authorized procedure in the research field of fluids engineering. The typical H-Q curve of VFP, which is the relationship between the pump head and the flow rate, can be obtained. This result suggests that the miniature VFP developed here can be expected to be used as the booster pump for the external shunt catheter in clinical applications.
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Dobsák P, Vaskuo J, Baba A, Isoyama T, Saito I, Siegelová J, Jancík J, Svacinová H, Imachi K. Microvessels of bulbar conjunctiva in UPTAH goats. Artif Organs 2003; 27:114-8. [PMID: 12534723 DOI: 10.1046/j.1525-1594.2003.07189.x] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
Aiming to observe directly the microcirculation after total artificial heart (TAH) implantation, we performed a long-term follow-up in 2 goats using conjunctival angioscopy. A short segment of parallel arteriole and venule was photographed and analyzed on computer picture program (magnification 40x). Three main parameters were measured: arteriole diameter, venule diameter, and arteriovenous ratio (A/V ratio). The intrathoracically implanted TAH was the undulation pump total artificial heart (UPTAH) with cardiac output of 100 ml/kg/min. To stabilize the peripheral hemodynamics a 1/R biofeedback control system was used. Our results provided only elementary data about morphology of bulbar microvessels. The main finding was the tendency to general vasoconstriction, more intensive on the venous side (*P < 0.05 in one goat). We did not observe any pathological shapes (e.g., tortuosities, varicosities, or sludge); this result could be attributed to the high effectivity of 1/R control method. These preliminary results should be considered only as an attempt to apply the widely used clinical method of conjunctival angioscopy to the conditions of TAH.
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Miyashita Y, Nagahama T, Kubota E, Saito I, Saruta T. 1P-0133 Add-on doxazosine to ARB could improve endothelial function and insulin resistance. ATHEROSCLEROSIS SUPP 2003. [DOI: 10.1016/s1567-5688(03)90207-8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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145
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Matsuoka T, Okamoto Y, Matsuzaki Z, Endo S, Ito E, Tsutsumi H, Williamson RA, Sakurai H, Burton DR, Saito I. Characteristics of immunity induced by viral antigen or conferred by antibody via different administration routes. Clin Exp Immunol 2002; 130:386-92. [PMID: 12452827 PMCID: PMC1906556 DOI: 10.1046/j.1365-2249.2002.02003.x] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
The characteristics of the immunity induced by viral antigens or conferred by antiviral antibody via different routes of administration were evaluated comparatively. C57BL/6 mice were immunized via intranasal, intradermal or enteric routes with a live recombinant vaccinia virus expressing the respiratory syncytial virus (RSV) F glycoprotein (F.rVV) or RSV, and then challenged intranasally with RSV. Inhibition of RSV replication was observed in the lungs of all the mice; however, only intranasal immunization hindered virus replication in the nose. Lung inflammation, characterized by infiltration of neutrophils and of mononuclear cells was strongest in the intradermally immunized mice, but was observed in all F.rVV immunized mice to various degrees. Intranasal administration of a potently neutralizing human anti-RSV antibody Fab fragment to infected mice inhibited RSV replication in the nose and, when combined with intraperitoneal administration, protected both the lung and the nose in the absence of deleterious lung pathology. These data suggest that intranasal immunization with F.rVV reduces RSV replication in the respiratory tract, but still induces pathological lung inflammation, even though this is milder than that observed following intradermal immunization. Local neutralizing antibody is indispensable for protection in the nose.
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Nakano M, Ishimura M, Chiba J, Kanegae Y, Saito I. DNA substrates influence the recombination efficiency mediated by FLP recombinase expressed in mammalian cells. Microbiol Immunol 2002; 45:657-65. [PMID: 11694078 DOI: 10.1111/j.1348-0421.2001.tb01299.x] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
The FLP recombinase derived from Saccharomyces cerevisiae mediates precise site-specific recombination between a pair of FLP recognition targets (FRTs). Like the Cre/loxP system derived from bacteriophage P1, the FLP/FRT system has recently been applied to gene regulation systems using an FLP-expressing recombinant adenovirus (rAd) (Nakano et al, Nucleic Acids Res. 29: e40, 2001). In an attempt to improve the FLP/FRT system by altering its DNA substrates, we compared the recombination efficiency among different substrates by a quantitative in vitro assay using FLP expressed in mammalian cells. Unexpectedly, we found that one linearized DNA substrate showed 4- to >20-fold lower recombination efficiency than other substrates, which phenomenon has not been observed in the Cre/loxP system. The quantitative in vitro assay using truncated DNA substrates suggested that the recombination efficiency seemed to be influenced not only by the linearized position of the substrate, but also by the length between a pair of FRTs. Such substrate preference of FLP expressed in mammalian cells should probably be noted when designing versatile applications of the FLP/FRT system as a gene regulation system in mammalian systems. Fortunately, however, we demonstrated that no substrate preference was observed when using a particular substrate (pCAFNF5) and the preference was reduced when using a certain pair of mutant FRTs (f72), which will also be a promising tool for simultaneous gene regulation in combination with wild-type FRT.
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147
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Ito D, Tanahashi N, Murata M, Sato H, Saito I, Watanabe K, Fukuuchi Y. Notch3 gene polymorphism and ischaemic cerebrovascular disease. J Neurol Neurosurg Psychiatry 2002; 72:382-4. [PMID: 11861701 PMCID: PMC1737788 DOI: 10.1136/jnnp.72.3.382] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/04/2022]
Abstract
Cerebral autosomal dominant arteriopathy with subcortical infarcts and leukoencephalopathy (CADASIL) is a type of hereditary stroke and dementia. More than 90% of patients with CADASIL have mutations in the Notch3 gene. All mutations either create or destroy a cysteine residue in the epidermal growth factor-like repeats. In addition, five polymorphisms, which lead to amino acid substitutions, have been identified within the Notch3 coding sequence. However, whether these polymorphisms affect Notch signalling or are involved in cerebrovascular diseases is unknown. In the present study, we investigated a possible association between a T6746C polymorphism in the Notch3 coding region and the occurrence of symptomatic ischaemic cerebrovascular disease (CVD) was investigated. Two hundred and thirty five patients with CVD, as confirmed by brain CT or MRI, and 315 age and sex matched control subjects were analyzed for genotype frequencies of the T6746C polymorphism in Notch3. The genotype distributions were: patients with CVD, C/C 14.0%, C/T 45.5%, and T/T 40.4%; controls, C/C, 14.3%; C/T, 47.9%; T/T, 37.8%. The Japanese population has a higher C allele frequency of the T6746C polymorphism than European populations. There was no significant difference between the T6746C polymorphism in patients with CVD and controls (chi(2)=0.414, p=0.813). This was confirmed by the results of multiple logistic regression analysis including established risk factors (chi(2) =4.65, p=0.311). In conclusion, the results indicate that T6746C polymorphism in the intracellular domain of the Notch3 gene is not associated with an increased risk for CVD.
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Saito I, Koshino T, Nakashima K, Uesugi M, Saito T. Increased cellular infiltrate in inflammatory synovia of osteoarthritic knees. Osteoarthritis Cartilage 2002; 10:156-62. [PMID: 11869075 DOI: 10.1053/joca.2001.0494] [Citation(s) in RCA: 66] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
Abstract
OBJECTIVE To determine the nature and origin of synovial inflammation in knees with osteoarthritis (OA). METHOD Synovial samples were obtained from 21 medial compartmental knee OAs from 19 patients. First, using 11 medial knee synovial samples from 9 patients, a quantitative estimation of synovitis was made with both ordinary and immunohistochemical staining. Second, from the other 10 knees, tissue samples were taken from both the medial and the lateral compartments to quantify cells that infiltrated into the synovium. Medial synovium was immunostained using antibodies to anti-type II collagen, CD68, CD2, CD4, CD8, CD15, CD19, CD25, HLA-DR, CD1a and LN5. The lateral synovium was immunostained with anti-type II collagen, CD68, HLA-DR and CD4 antibody as a control. RESULT Denatured cartilaginous detritus was found captured by synovial lining cells with a strong immunoreactivity to CD68 antibody, and whose phagocytic potential was activated. The number of anti-type II collagen-positive fragments in the medial compartment of the knee was larger than that found in the lateral compartment. Moreover, the population of CD68-positive cells in synovial tissue and HLA-DR-positive cells in the lining layer was larger in the medial compartment than in the lateral compartment. The number of CD4-positive cells (defined as helper/inducer T lymphocytes) was greater in medial synovium than in lateral synovium. CONCLUSION Overall, this study strongly supports the concept that the synovitis observed in patients with knee OA might be induced by an immunological mechanism involving, to some extent, a macrophage/helper T cell interaction.
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Nakatani K, Sando S, Kumasawa H, Kikuchi J, Saito I. Recognition of guanine-guanine mismatches by the dimeric form of 2-amino-1,8-naphthyridine. J Am Chem Soc 2001; 123:12650-7. [PMID: 11741430 DOI: 10.1021/ja0109186] [Citation(s) in RCA: 108] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Dimeric 2-amino-1,8-naphthyridine selectively binds to a G-G mismatch with high affinity (K(d) = 53 nM). We have investigated a binding mechanism of naphthyridine dimer 2 to a G-G mismatch by spectroscopic studies, thermodynamic analysis, and structure-activity studies for the thermal stabilization of the mismatch. 1H NMR spectra of a complex of 2 with 9-mer duplex d(CATCGGATG)2 containing a G-G mismatch showed that all hydrogens in two naphthyridine rings of 2 were observed upfield compared to those of 2 in a free state. The 2D-NOESY experiments showed that each naphthyridine of 2 binds to a guanine in the G-G mismatch within the pi-stack. In CD spectra, a large conformational change of the G-G mismatch-containing duplex was observed upon complex formation with 2. Isothermal calorimetry titration of 2 binding to the G-G mismatch showed that the stoichiometry for the binding is about 1:1 and that the binding is enthalpy-controlled. It is clarified by structure-activity studies that show (i) the linker connecting two naphthyridine rings was essential for the stabilization of the G-G mismatch, (ii) the binding efficiency was very sensitive to the linker structure, and (iii) the binding of two naphthyridines to each one of two Gs in the G-G mismatch is essential for a strong stabilization. These results strongly supported the intercalation of both naphthyridine rings of 2 into DNA base pairs and the formation of a hydrogen bonded complex with the G-G mismatch.
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Seyama H, Kurita H, Noguchi A, Shiokawa Y, Saito I. Resolution of intractable hiccups caused by cerebellar hemangioblastoma. Neurology 2001; 57:2142. [PMID: 11739848 DOI: 10.1212/wnl.57.11.2142] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
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