Nigata University

Nigata, Japan

Nigata University

Nigata, Japan
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Figueiredo E.G.,University of Sao Paulo | Soga Y.,Nigata University | Amorim R.L.O.,University of Sao Paulo | Oliveira A.M.P.,University of Sao Paulo | Teixeira M.J.,University of Sao Paulo
Skull Base | Year: 2011

We systematically reviewed the literature concerning the anterior cranial fossa schwannomas to understand their pathogenesis, determine their origin, and standardize the terminology. We performed a MEDLINE, EMBASE, and Science Citation Index Expanded search of the literature; age, gender, clinical presentation, presence or absence of hyposmia, radiological features, and apparent origin were analyzed and tabulated. Cases in a context of neurofibromatosis and nasal schwannomas with intracranial extension were not included. Age varied between 14 and 63 years (mean = 30.9). There were 22 male and 11 female patients. The clinical presentation included seizures (n = 15), headache (n = 16), visual deficits (n = 7), cognitive disturbances (n = 3), and rhinorrhea (n = 1). Hyposmia was present in 14 cases, absent in 13 cases (39.3%), and unreported in five. Homogeneous and heterogeneous contrast enhancement was observed in 14 and 15 cases, respectively. The region of the olfactory groove was the probable site in 96.5%. Olfactory tract could be identified in 39.3%. The most probable origin is the meningeal branches of trigeminal nerve or anterior ethmoidal nerves. Thus, olfactory groove schwannoma would better describe its origin and pathogenesis and should be the term preferentially used to name it. Copyright © 2011 by Thieme Medical Publishers, Inc.

Nakanishi K.,Toho University | Nagai Y.,Toho University | Nagai Y.,Tokyo Kidney Research Institute | Honglan Piao,Nigata University | And 8 more authors.
JRAAS - Journal of the Renin-Angiotensin-Aldosterone System | Year: 2011

Introduction: The nephro-protective effects of angiotensin II receptor blockers (ARBs) are widely known; however, there are few reports of long-term effects focusing on the renal vessels. We studied afferent arteriolar changes induced by the long-term administration of an ARB. Materials and Methods: Thirty-two 6-week-old male Zucker fatty rats (ZFRs) were divided into following four groups (n = 8 in each): ZFR Group and ZFR+High Group fed a standard or high-salt diet, respectively; ZFR+ARB Group and ZFR+High+ARB Group fed a standard or high-salt diet with ARB (Olmesartan, 5 mg/kg/day), respectively. Blood pressure, proteinuria, morphological examinations and glomerular haemodynamics in vivo were studied. Results: Marked proliferative changes in the afferent arteriolar smooth muscle cells (SMCs) were frequently observed in the two groups given ARBs; in the ZFR+ARB group (77.3±10.3%) compared with the two groups without ARB (1.7%, p < 0.005; 1.2%, p < 0.0005) and 37.4±15.6% in the ZFR+High+ARB group. Proteinuria markedly decreased in the groups treated with ARBs, but the glomerular erythrocyte velocities showed no differences. Conclusions: Our findings indicate that long-term ARB administration induced unusual proliferative changes in SMCs of afferent arterioles of ZFRs. These changes could narrow arteriolar lumens and reduce intraglomerular pressure, but they could cause also irreversible damage to the arterioles. © The Author(s) 2011.

Ohshiro T.,Osaka University | Hotehama C.,Osaka University | Matsubara K.,Nigata University | Konda K.,Osaka University | And 6 more authors.
Proceedings of the 16th International Conference on Miniaturized Systems for Chemistry and Life Sciences, MicroTAS 2012 | Year: 2012

We developed a simple fabrication procedure for a fabrication of nanostructures with electron-beam (EB) lithography. We found that, an electron-beam irradiation with a density of over 50 mC/cm2 have high-resistance against dry-etching, resulting preserve in a clear-pattern of fluidics and through-hole pore for the EB-lithographed image. This electron-beam "baking" procedure would be a useful for EB lithography fabrications of nanobiodevices containing various kinds of nanostructure, e.g., pore, channel, pillar, and fluidics.

Ahmed I.T.,Taif University | Ahmed I.T.,Zagazig University | Ahmed I.T.,Nigata University | Soliman M.M.,Taif University | And 7 more authors.
Asian Journal of Biochemistry | Year: 2012

Eicosapentaenoic Acid (EPA) is an omega-3 fatty acid (polyunsaturated fatty acid) that has pleiotropic effects as hypolipidemic and anti-inflammatory actions. Podocytes injury in the renal glomeruli has been proposed as the crucial mechanism in the development of focal segmental glomerulosclerosis or nephrosis. The effect of EPA on Puromycin aminonucleoside (PAN) induced nephrosis was tested. EPA was administered daily for 28 days at a dose of 1 g kg-1 b.wt. then PAN was injected intravenously at a dose of 6 mg/100 g of body weight followed by EPA for 6 days. PAN nephrosis induced increase in proteinuria, lipid profiles, podocytes proteins expression and immunolocalization. EPA induced decrease in proteinuria and lipid profiles induced by PAN nephrosis. Also, EPA induced significant down-regulation in expression of connexin 43 and synaptopodin. Moreover, EPA induced 50% decrease in glomerular cell adhesion induced by PAN nephrosis. Immunoflerusecnce shows expression of desmin and connexin 43 in rat glomeruli that increased by PAN and decreased by EPA. These findings collectively showed that EPA has reno-protective effect during inflammation. © 2012 Academic Journals Inc.

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