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Yokota H, Yokoyama K, Noguchi H, Uchiyama Y, Iwasaki S, Sakaki T. Thoracic Osteophyte Causing Spontaneous Intracranial Hypotension. Cephalalgia 2008; 28:396-8. [DOI: 10.1111/j.1468-2982.2008.01536.x] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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Mitaka C, Yokoyama K, Imai T. Nitric oxide production is more prominent in off-pump than in on-pump coronary artery bypass surgery. Anaesth Intensive Care 2008; 35:505-9. [PMID: 18020067 DOI: 10.1177/0310057x0703500407] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
The aim of our study was to elucidate the extent to which cardiopulmonary bypass contributes to endogenous nitric oxide (NO) production in patients undergoing coronary artery bypass grafts (CABG). One-hundred-and-sixteen patients undergoing elective CABG with (on-pump, n=66) and without cardiopulmonary bypass (off-pump, n=50) were included. Urinary nitrite/nitrate (NOx) excretion was measured as an index of endogenous NO production during the first two postoperative days. Haemodynamic profiles, serum CK-MB and C-reactive protein (CRP) concentrations were measured after the operation. There was no significant difference in urinary NOx/creatinine (Cr) excretion on day one post CABG. The mean urinary NOx/Cr excretion ratio significantly (P < 0.01) decreased from days one to two in the on-pump group, but not in the off-pump group. The mean urinary NOx/Cr excretion ratio was significantly (P < 0.01) higher in the off-pump group (0.51 +/- 0.26 micromol/mg) than in the on-pump group (0.38 +/- 0.20 micromol/mg) on day two. The mean serum CRP concentration was also significantly (P < 0.01) higher in the off-pump group than in the on-pump group on day two. There was no significant difference in the mean cardiac index or the mean systemic vascular resistance index between the two groups after surgery. The mean serum CK-MB concentration was significantly (P < 0.05) lower in the off-pump group than in the on-pump group on days one and two. These findings suggest that endogenous NO production is stimulated by a surgical inflammatory response and that the cardiopulmonary bypass procedure per se is not the inciting stimulus for NO production in patients undergoing CABG.
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Yokoyama K, Sugano N, Rahman AKMS, Oshikawa M, Ito K. Activity of anti-Porphyromonas gingivalis egg yolk antibody against gingipains in vitro. ACTA ACUST UNITED AC 2008; 22:352-5. [PMID: 17803634 DOI: 10.1111/j.1399-302x.2007.00358.x] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
Abstract
INTRODUCTION We investigated the effect of anti-Porphyromonas gingivalis egg yolk antibody against gingipains [immunoglobulin Y (IgY)-GP] on gingipain activity in vitro. METHODS IgY-GP was isolated from the yolks of White Leghorn hens immunized with purified gingipains. Control antibody (IgY) was isolated from the yolks of non-immunized hens. Gingipain activity was assessed according to the rate of enzymatic substrate hydrolysis. Human epithelial cells were cultured with or without gingipains and with gingipains pretreated with either IgY-GP or IgY. RESULTS Hydrolytic activity decreased in the presence of IgY-GP. Cells incubated with gingipains showed a dose-dependent loss of adhesion activity. Pretreatment of gingipains with IgY-GP was associated with strong inhibition of cell detachment, whereas pretreatment with IgY was not. CONCLUSION Our findings suggest that IgY-GP may be an effective immunotherapeutic agent in the treatment of periodontitis.
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Li L, Kuwamoto S, Fujimura E, Yokoyama K, Urushihara Y, Matsui J, Co A, Leal GL, Colby RH, Giacomin AJ. SAXS Studies on Agglomerative Silica Suspension under Shear. ACTA ACUST UNITED AC 2008. [DOI: 10.1063/1.2964844] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022]
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Kawahara T, Matsui H, Otsuki K, Karuppuchamy S, Yokoyama K, Yoshihara M. Synthesis of a Net-Worked Strontium-O-Phenylene-S-Tellurium Hybrid Co-polymer Having a Two-Step Electron Transfer Nature. Des Monomers Polym 2008. [DOI: 10.1163/156855508x292419] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022] Open
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Matsuura Y, Yokoyama K, Takada H, Shimada K. Dynamics analysis of electrogastrography using Double-Wayland algorithm. ACTA ACUST UNITED AC 2007; 2007:1973-6. [PMID: 18002371 DOI: 10.1109/iembs.2007.4352705] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
The electrogastrography (EGG) is an abdominal surface measurement of the electric activity of the stomach. It is great clinical importance to record and analyze multi-channel EGGs, which provide more information on the propagation and co-ordination of gastric contractions. The aim of the study is to estimate the dynamics that generate electrogastrography Double-Wayland algorithm was applied to the analysis. As a result, all the components of multi-channel EGGs can be generated from a chaos process. We found 5 or 6 independent essential components from EGGs.
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Meher M, Nagata K, Iwata M, Makyio H, Yoshida M, Yokoyama K, Iwata S. Crystal structure of A3B3 subcomplex of V-ATPase from T. thermophilus. Acta Crystallogr A 2007. [DOI: 10.1107/s010876730709945x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022] Open
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Park HJ, Uchino M, Nakamura M, Ueno M, Kojima Y, Itoman M, Yokoyama K, Suzuki T, Nemoto M. Immediate interlocking nailing versus external fixation followed by delayed interlocking nailing for Gustilo type IIIB open tibial fractures. J Orthop Surg (Hong Kong) 2007; 15:131-6. [PMID: 17709847 DOI: 10.1177/230949900701500201] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/15/2022] Open
Abstract
PURPOSE To compare immediate interlocking nailing with external fixation followed by delayed interlocking nailing, for Gustilo type IIIB open tibial fractures. METHODS 23 patients with Gustilo IIIB open tibial fractures were treated with either immediate unreamed interlocking nailing (n=9) or external fixation followed by delayed unreamed interlocking nailing (n=14). Patient age, sex ratio, fracture site, fracture type, and severity were similar in both groups. The time to union, deep infection rate, and nonunion rate in the 2 groups were compared. RESULTS In the immediate and delayed nailing groups, respective mean times to union were 21 (standard deviation [SD], 14) months and 14 (SD, 8) months; nonunion rates were 44% (4/9) and 36% (5/14), and deep infection rates were 22% (2/9) and 7% (1/14). All corresponding differences were not statistically significant. CONCLUSION Prospective, randomised, multicentre studies are needed to assess whether there are significant differences between the 2 treatment methods.
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Yamashita M, Kubota T, Fuchita E, Yokoyama K, Hayashi H, Okamoto S, Sano E, Matsuo A, Shimasue N, Watanabe T, Kawashima R, Sugimoto K. A nursing tool validated as an effective measure over MMSE and FAB in dementia. Int Nurs Rev 2007; 54:179-82. [PMID: 17492992 DOI: 10.1111/j.1466-7657.2007.00541.x] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
Abstract
AIM To evaluate the clinical use of the Abilities Assessment Instrument (AAI) when used together with Mini Mental State Examination (MMSE) and Frontal Assessment Battery (FAB), thus examining the concurrent validity of the instrument. Also, to evaluate the effect of a learning program administered for elders with dementia. METHODS Fourteen older people, who were afflicted with Alzheimer's disease or related dementias, were invited into a learning program. Measures were taken at baseline, at 3 months and 6 months to see the effects of the program. Instruments used in the study were the AAI, the MMSE and the FAB. FINDINGS There were statistically significant differences measured by the Japanese version of the AAI in the subjects' abilities to perform the learning tasks between 3 and 6 months after intervention. No statistical significant differences were noted at any points in time measured by the MMSE or the FAB. CONCLUSION The translated AAI promises to be a valid instrument for nurses' use in their day-to-day assessment of Japanese elders. The AAI appears also to be useful in learning programs with this population, and may have value as a screening tool.
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Yokoyama K. Acute shortening and re-lengthening in the management of bone and soft-tissue loss in complicated fractures of the tibia. ACTA ACUST UNITED AC 2007; 89:846; author reply 846-7. [PMID: 17613517 DOI: 10.1302/0301-620x.89b8.19833] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
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Nakamoto Y, Mizukoshi E, Tsuji H, Sakai Y, Kitahara M, Arai K, Yamashita T, Yokoyama K, Mukaida N, Matsushima K, Matsui O, Kaneko S. Combined therapy of transcatheter hepatic arterial embolization with intratumoral dendritic cell infusion for hepatocellular carcinoma: clinical safety. Clin Exp Immunol 2007; 147:296-305. [PMID: 17223971 PMCID: PMC1810477 DOI: 10.1111/j.1365-2249.2006.03290.x] [Citation(s) in RCA: 38] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022] Open
Abstract
The curative treatments for hepatocellular carcinoma (HCC), including surgical resection and radiofrequency ablation (RFA), do not prevent tumour recurrence effectively. Dendritic cell (DC)-based immunotherapies are believed to contribute to the eradication of the residual and recurrent tumour cells. The current study was designed to assess the safety and bioactivity of DC infusion into tumour tissues following transcatheter hepatic arterial embolization (TAE) for patients with cirrhosis and HCC. Peripheral blood mononuclear cells (PBMCs) were differentiated into phenotypically confirmed DCs. Ten patients were administered autologous DCs through an arterial catheter during TAE treatment. Shortly thereafter, some HCC nodules were treated additionally to achieve the curative local therapeutic effects. There was no clinical or serological evidence of adverse events, including hepatic failure or autoimmune responses in any patients, in addition to those due to TAE. Following the infusion of (111)Indium-labelled DCs, DCs were detectable inside and around the HCC nodules for up to 17 days, and were associated with lymphocyte and monocyte infiltration. Interestingly, T lymphocyte responses were induced against peptides derived from the tumour antigens, Her-2/neu, MRP3, hTERT and AFP, 4 weeks after the infusion in some patients. The cumulative survival rates were not significantly changed by this strategy. These results demonstrate that transcatheter arterial DC infusion into tumour tissues following TAE treatment is feasible and safe for patients with cirrhosis and HCC. Furthermore, the antigen-non-specific, immature DC infusion may induce immune responses to unprimed tumour antigens, providing a plausible strategy to enhance tumour immunity.
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Yokoyama K. Acute compression and lengthening by the Ilizarov technique for infected nonunion of the tibia with large bone defects. J Orthop Surg (Hong Kong) 2007; 15:122. [PMID: 17429136] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/07/2023] Open
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Yokoyama K, Yoshida H, Kato J, IIda R, Kawamura Y, Yamamoto H, Hosoya T. The low-calcium concentration of dialysate induced markedly an increase of serum parathyroid hormone in a continuous ambulatory peritoneal dialysis patient. Kidney Int 2007. [DOI: 10.1038/sj.ki.5002062] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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Yoshida H, Yokoyama K, Munakata K, Maruyama Y, Yamamoto R, Hanaoka K, Ikeda M, Yamamoto H, Hosoya T. Superior dialytic clearance of beta2 microglobulin and p-cresol by high-flux hemodialysis as compared to peritoneal dialysis. Kidney Int 2007; 71:467; author reply 467-8. [PMID: 17315011 DOI: 10.1038/sj.ki.5002063] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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Sasaki S, Tokitsu Y, Ikebukuro K, Yokoyama K, Masuda Y, Karube I. Biosensing Of A Herbicide Using A Chemically Modified Antibody In Organic Solvent. ANAL LETT 2006. [DOI: 10.1080/00032719708001792] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
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Murakami H, Kawahara N, Yahata T, Yokoyama K, Komai K, Tomita K. Radiation myelopathy after radioactive iodine therapy for spine metastasis. Br J Radiol 2006; 79:e45-9. [PMID: 16861317 DOI: 10.1259/bjr/16265478] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022] Open
Abstract
A case of radiation myelopathy after radioactive iodine therapy is reported. This is the first report to describe radiation myelopathy after I-131 therapy. A 62-year-old female with spinal metastasis of T10 received I-131 therapy. She presented with radiation myelopathy 34 months after the irradiation. We need to recognize the possibility of this serious complication even in the case of I-131 therapy. There is a risk of radiation myelopathy even after I-131 therapy, especially in cases with spinal cord compression such as this.
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Yoshita M, Taki J, Yokoyama K, Noguchi-Shinohara M, Matsumoto Y, Nakajima K, Yamada M. Value of 123I-MIBG radioactivity in the differential diagnosis of DLB from AD. Neurology 2006; 66:1850-4. [PMID: 16801649 DOI: 10.1212/01.wnl.0000219640.59984.a7] [Citation(s) in RCA: 134] [Impact Index Per Article: 7.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022] Open
Abstract
OBJECTIVE To evaluate the diagnostic reliability of cardiac iodine-123 metaiodobenzylguanidine ((123)I-MIBG) radioactivity in discriminating dementia with Lewy bodies (DLB) from Alzheimer disease (AD) regardless of parkinsonism. BACKGROUND The diagnosis of DLB may be confounded by the absence of parkinsonism. This highlights the need to improve the accuracy of antemortem diagnosis of DLB without parkinsonism. METHODS Cardiac sympathetic denervation was examined using myocardial (123)I-MIBG scintigraphy in 37 patients with DLB, 42 patients with AD, and 10 normal elderly controls. The DLB patients consisted of seven patients without parkinsonism (DLB/P-) and 30 patients with parkinsonism (DLB/P+) at the time of the study. RESULTS The heart-to-mediastinum uptake ratio (H/M ratio) of myocardial MIBG uptake was decreased in both the DLB groups vs the AD group (p < 0.0001) and control group (p < 0.0001). The washout rate (WR) was higher in the DLB group than in the control group (p < 0.0001) and AD group (p < 0.0001). No differences were found between the AD and control groups or between the DLB/P+ and DLB/P- groups in either the early or delayed H/M ratio or WR. In discriminating between DLB and AD, regardless of parkinsonism, the delayed H/M ratio had a sensitivity of 100%, a specificity of 100%, and a positive predictive value of 100% at a cutoff value of 1.68. CONCLUSIONS Our results indicate that dementia with Lewy bodies results in cardiac sympathetic denervation and that iodine-123 metaiodobenzylguanidine myocardial scintigraphy is a sensitive tool for discriminating dementia with Lewy bodies from Alzheimer disease even in patients without parkinsonism.
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Clerici F, Contini A, Corsini A, Ferri N, Grzesiak S, Pellegrino S, Sala A, Yokoyama K. Isothiazoles. Part XV. A mild and efficient synthesis of new antiproliferative 5-sulfanylsubstituted 3-alkylaminoisothiazole 1,1-dioxides. Eur J Med Chem 2006; 41:675-82. [PMID: 16540206 DOI: 10.1016/j.ejmech.2006.01.009] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 01/12/2006] [Indexed: 10/24/2022]
Abstract
5-Sulfanyl-3-alkylaminoisothiazole dioxide derivatives have been identified as a new class of potent inhibitors of rat aortic myocite proliferation. They were prepared by applying a simple methodology able to introduce a heteroatom on C-5 of the 3-alkylaminoisothiazole dioxide system. 3-Aminosubstituted-5-chloroisothiazole dioxides react smoothly not only with S-nucleophiles but also with N- and O-nucleophiles affording the corresponding 5-heterosubstituted isothiazole dioxides through an addition-elimination reaction. The behavior of 3-alkylamino-4-bromo-isothiazole 1,1-dioxide with S-, N- and O-nucleophiles affording the same products has also been described. On the contrary, the 3-amino-4,5-unsubstituted isothiazole dioxide system reacts easily only with sulfur nucleophiles affording the corresponding 4,5-dihydro-5-sulfanylderivatives through a simple Michael addition reaction.
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Nakayama M, Nakano H, Tsuboi N, Kurosawa T, Tsuruta Y, Iwasaki Y, Yokoyama K, Hosoya T, Fukagawa M. The effect of angiotensin receptor blockade ARB on the regression of left ventricular hypertrophy in hemodialysis patients: comparison between patients with D allele and non-D allele ACE gene polymorphism. Clin Nephrol 2006; 64:358-63. [PMID: 16312263 DOI: 10.5414/cnp64358] [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: 11/18/2022] Open
Abstract
OBJECTIVE It is revealed that LVH is one of risk factors for the development of cardiac complications in long-term HD patients. Therefore, maneuvers to reduce hypertrophy of cardium are very important for improving life prognosis. Angiotensin II receptor blockade (ARB) could reduce LVH in general populations without renal failure. However, no conclusive data has been available regarding the clinical consequences of ARB administration on the regression of LVH in HD patients. Furthermore, it has not clearly determined if ACE gene polymorphism has a possible influential effect on it. This study is conducted to clarify these issues. SUBJECTS AND METHOD 32 hypertensive patients on regular HD (male/female: 21/11, mean age: 60.5 years, mean duration of HD: 52.8 months) were studied. Patients were classified into two groups according to the different type of ACE gene polymorphism: cases with D allele (DD/ID; D group: n = 13) and those without (II; non-D group: n = 19). All patients were administered ARB (losartan 50 - 100 mg/day) and echocardiography (UCG) was performed at 6-month-interval regularly until the end of observation (24 months). RESULTS Before the commencement of ARB, no differences were found between the two groups, neither in mean blood pressure (MBP: D group/non-D group: 120 +/- 13 vs. 115 +/- 14 mmHg) nor in left ventricular mass index (LVMI: D/non-D: 172 +/- 41 vs. 165 +/- 41 g/m2). During the 24r-month follow-up, there were significant and similar reductions in MBP in both groups. In respect to LVMI, a significant reduction of LVMI was found in the D group after six months (p < 0.01 vs. basal) with a final reduction rate (FRR) -26 +/- 13%, whereas in the non-D group it was found at 24 months (p < 0.01 vs. basal) with FRR -11 +/- 16% (p < 0.01 vs. D group). There were significant differences between the two groups at all points (p < 0.05 at 6, 18 and 24 months, p < 0.005 at 12 months, respectively). CONCLUSION It is indicated that ARB could insert a regression effect on LVH predominantly in patients with D allele ACE polymorphism, due partly to factor (s) independent of its anti-hypertensive effect.
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Dekio I, Anzai H, Ohyama M, Tanikawa A, Amagai M, Yokoyama K, Okamoto S, Tanaka M. Aleukaemic leukaemia cutis as an initial manifestation of myeloid/NK cell precursor acute leukaemia. J Eur Acad Dermatol Venereol 2006; 20:453-6. [PMID: 16643148 DOI: 10.1111/j.1468-3083.2006.01491.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: 11/28/2022]
Abstract
Aleukaemic leukaemia cutis is a rare condition characterized by infiltration of leukaemic cells into the skin before they appear in the peripheral blood. We report a case of an aleukaemic leukaemia cutis, which had a history of exposure to atomic bomb radiation. A 57-year-old Japanese woman initially presented with a 20-week history of multiple red papules and plaques mainly over the trunk. Histological examination revealed the infiltration of atypical monocytic cells in the dermis, but no leukaemic cells were detected in the peripheral blood. Twenty-three weeks after the appearance of the eruption, leukaemic cells were detected in the peripheral blood for the first time. The results of immunohistochemistry of the skin biopsy specimen and flow cytometry of the peripheral blood indicated the rare phenotype of myeloid/NK cell precursor acute leukaemia. This is the first case report of myeloid/NK cell precursor acute leukaemia presenting as aleukaemic leukaemia cutis in the English literature, and awareness of this clinical presentation may be important to reach the correct diagnosis.
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Hattori N, Shirai A, Sugiura Y, Li W, Yokoyama K, Misawa Y, Okuzumi K, Tamaki K. Onychomycosis caused by Fusarium proliferatum. Br J Dermatol 2005; 153:647-9. [PMID: 16120158 DOI: 10.1111/j.1365-2133.2005.06692.x] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
Abstract
Fusarium infections in humans are usually opportunistic, but the fungus sometimes infects healthy persons, causing keratomycosis or onychomycosis. Onychomycosis is usually caused by F. solani or F. oxysporum. We report the first two cases of onychomycosis caused by F. proliferatum, and discuss methods of diagnosis and effective treatment. Nail samples from the two patients were examined by direct microscopy, cultured, and identified morphologically and genetically as F. proliferatum. Both patients were treated successfully with oral itraconazole, even though the minimum inhibitory concentration of itraconazole was relatively high in Patient 1. This is the first report of F. proliferatum as an agent of onychomycosis. Itraconazole may be effective in the treatment of onychomycosis caused by F. proliferatum.
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Kaneko T, Yokoyama K, Makita K. Late preconditioning with isoflurane in cultured rat cortical neurones. Br J Anaesth 2005; 95:662-8. [PMID: 16143577 DOI: 10.1093/bja/aei228] [Citation(s) in RCA: 31] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
BACKGROUND We tested the hypothesis that isoflurane induces late preconditioning in cultured rat cortical neurones and preconditioning elicits changes in expression of Kir6.2 (the ion-conducting subunit of the metabolically responsive ATP-sensitive potassium (K(ATP)) channel) and EAAC1 (neuronal glutamate transporter). METHODS Primary cultures of rat cortical neurones were exposed to non-lethal oxygen-glucose deprivation (OGD), i.e. ischaemic preconditioning, for 30 min, 100 microM of diazoxide, a potent opener of the mitochondrial K(ATP) (mitoK(ATP)) channels, for 60 min or 1.4% isoflurane for 3 h. Lethal OGD was performed for 120 min 24 h after preconditioning stimuli. Neuronal injury was assessed by measurement of lactate dehydrogenase (LDH) efflux into the medium 24 h after lethal OGD, and neural viability was determined by proliferation assay. Gene and protein expression was confirmed by quantitative reverse transcriptase-polymerase chain reaction (RT-PCR) and western blot analysis 24 h after preconditioning stimuli. RESULTS All preconditioning stimuli resulted in a significant decrease in LDH activity and maintained neuronal viability. These effects were abolished by 5-hydroxydecanoate, a selective inhibitor of the mitoK(ATP) channel. Quantitative RT-PCR and Western blot analysis demonstrated that there was no significant difference between Kir6.2 mRNA and protein levels. All preconditioning stimuli resulted in > or =2-fold increases in EAAC1 mRNA and protein compared with control. CONCLUSIONS Isoflurane induced late preconditioning in cultured rat cortical neurones. Ischaemic and pharmacological preconditioning with diazoxide and isoflurane induced ischaemic tolerance in the cultured neurones via mitoK(ATP) channels without an increase in Kir6.2 expression, and induced upregulation of EAAC1 expression.
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Yokoyama K, Nishikitani M, Araki S. Reasons for drinking in relation to problem drinking behavior in a sample of Japanese high school students. Int J Behav Med 2005; 6:135-49. [PMID: 16250684 DOI: 10.1207/s15327558ijbm0602_3] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/31/2022]
Abstract
To clarify reasons for drinking in relation to problem drinking behavior, 494 male students, aged 15 to 18 years old and attending high schools in Tokyo, Japan, were examined by self-rating questionnaires including the Kuriharna Alcoholism Screening Test (KAST). Three hundred and forty-two students (69%) completed the questionnaires, of whom 143 indicated that they were current drinkers of alcohol (42% of respondents). Of the 143,16 (11%) reported, through the KAST, experience of problem drinking behavior. A factor analysis of 36 reasons for drinking identified 5 factors: Escapism, Sociability, Tension Reduction, Acting Like a Man, and Enjoyment/Home. A logistic regression analysis showed that drinking because of Escapism, Sociability, and Tension Reduction was significantly related to problem drinking behavior. Also, there was significant correlation between the 3 factors and the number of KAST items experienced by the 143 respondents. Our findings suggest that the factors of Escapism, Sociability, and Tension Reduction lead to problem drinking in Japanese high school students.
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Yamasaki T, Noguchi M, Liu B, Nakade K, Wang P, Murata T, Yokoyama K. Jun Dimerization Protein 2: A Multifunctional Transcription Factor in Mammalian Cells. Curr Genomics 2005. [DOI: 10.2174/1389202054750194] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
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Mahbub MH, Inoue M, Yokoyama K, Laskar MS, Ohnari H, Suizu K, Inagaki J, Takahashi Y, Harada N. Assessment of room temperature influence on finger blood flow response induced by short-term grasping of vibrating handle. Int Arch Occup Environ Health 2005; 79:22-6. [PMID: 16047186 DOI: 10.1007/s00420-005-0022-2] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/03/2004] [Accepted: 06/23/2005] [Indexed: 11/25/2022]
Abstract
OBJECTIVE To investigate the influence of room temperature on finger blood flow (FBF) change in healthy subjects exposed to short-term grasping of a vibrating handle under different room temperatures. METHODS FBF was measured using a blood flowmeter in six male subjects on the dorsum of the middle phalanx of third finger in both hands once at the end of every minute for an equal duration of 5 min at pre-exposure, during exposure to grasping of vibrating handle with sinusoidal vibration and after exposure. Vibration was generated with a frequency of 125 Hz and an rms acceleration of 40 m/s(2). Measurements were conducted in four room temperatures of 15+/-1, 20+/-1, 25+/-1 and 30+/-1 degrees C. RESULTS Compared with the baseline measurements in the exposed hand during grasping of vibrating handle most significant increase in FBF was observed at 15+/-1 degrees C (P<0.001) and least at 30+/-1 degrees C (P<0.05), and after vibration least significant FBF was found at 25+/-1 degrees C (P<0.05). In case of the unexposed hand significant increase in FBF was exhibited at 20+/-1 degrees C (P<0.01) and 30+/-1 degrees C (P<0.01) during vibration, and only at 15+/-1 degrees C (P<0.05) after vibration. CONCLUSIONS Response in FBF due to grasping of vibrating handle was of different patterns from the baseline measurement under different room temperature conditions in both exposed and unexposed hands and it was influenced by room temperature. Overall, the influence was greater at lower test room temperature, inducing more significant increase in FBF.
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