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Kameo H, Ikeda K, Sakaki S, Takemoto S, Nakazawa H, Matsuzaka H. Experimental and theoretical studies of Si–Cl and Ge–Cl σ-bond activation reactions by iridium-hydride. Dalton Trans 2016; 45:7570-80. [DOI: 10.1039/c6dt00003g] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2023]
Abstract
We report the iridium hydride-mediated Si–Cl and Ge–Cl σ-bond activation in a low-polarity toluene solution owing to diphosphine-chelation, in which the Si–Cl and Ge–Cl σ-bonds are readily cleaved through an SN2-type pathway via the formation of a free chloride anion.
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Azuma K, Ikeda K, Kagi N, Yanagi U, Osawa H. Prevalence and risk factors associated with nonspecific building-related symptoms in office employees in Japan: relationships between work environment, Indoor Air Quality, and occupational stress. INDOOR AIR 2015; 25:499-511. [PMID: 25244340 DOI: 10.1111/ina.12158] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/18/2014] [Accepted: 09/11/2014] [Indexed: 06/03/2023]
Abstract
A nationwide cross-sectional study of 3335 employees was conducted in 320 offices in Japan to estimate the prevalence of building-related symptoms (BRSs) and determine the risk factors related to work environment, Indoor Air Quality, and occupational stress. Data were collected through self-administered questionnaires. The prevalences of general symptoms, eye irritation, and upper respiratory symptoms were 14.4%, 12.1%, and 8.9%, respectively. Multiple logistic regression analyses revealed that eye irritation was significantly associated with carpeting [odds ratio (OR), 1.73; 95% confidence interval (CI), 1.24-2.41], coldness perception (OR, 1.28; 95% CI, 1.13-1.45), and air dryness perception (OR, 1.61; 95% CI, 1.42-1.82). General symptoms were significantly associated with unpleasant odors (OR, 1.37; 95% CI, 1.13-1.65), amount of work (OR, 1.24; 95% CI, 1.06-1.45), and interpersonal conflicts (OR, 1.44; 95% CI, 1.23-1.69). Upper respiratory symptoms were significantly associated with crowded workspaces (OR, 1.36; 95% CI, 1.13-1.63), air dryness perception (OR, 2.07; 95% CI, 1.79-2.38), and reported dustiness on the floor (OR, 1.39; 95% CI, 1.16-1.67). Although psychosocial support is important to reduce and control BRSs, maintaining appropriate air-conditioning and a clean and uncrowded workspace is of equal importance.
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Nishimura S, Takashima T, Kawajiri H, Kashiwagi S, Noda S, Tokunaga S, Tei S, Yamagata S, Sunami T, Tezuka K, Ikeda K, Mizuyama Y, Ogawa Y, Onoda N, Nishimori T, Ishikawa T, Kudo S, Takada M, Hirakawa K. 1859 Clinical effects of prior chemotherapy on eribulin: Update and subgroup analysis of phase 2 multicenter single arm study of eribulin mesylate as first-line therapy for HER2 negative locally advanced or metastatic breast cancer. Eur J Cancer 2015. [DOI: 10.1016/s0959-8049(16)30809-7] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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Mori T, Koga T, Fujino K, Motooka Y, Shibata H, Ikeda K, Shiraishi K, Suzuki M. P-173INTERSTITIAL FLUID PRESSURE MAY BE USED AS A PROGNOSTIC FACTOR FOR LUNG CANCER. Interact Cardiovasc Thorac Surg 2015. [DOI: 10.1093/icvts/ivv204.173] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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Tokunaga T, Sakashita M, Haruna T, Asaka D, Takeno S, Ikeda H, Nakayama T, Seki N, Ito S, Murata J, Sakuma Y, Yoshida N, Terada T, Morikura I, Sakaida H, Kondo K, Teraguchi K, Okano M, Otori N, Yoshikawa M, Hirakawa K, Haruna S, Himi T, Ikeda K, Ishitoya J, Iino Y, Kawata R, Kawauchi H, Kobayashi M, Yamasoba T, Miwa T, Urashima M, Tamari M, Noguchi E, Ninomiya T, Imoto Y, Morikawa T, Tomita K, Takabayashi T, Fujieda S. Novel scoring system and algorithm for classifying chronic rhinosinusitis: the JESREC Study. Allergy 2015; 70:995-1003. [PMID: 25945591 PMCID: PMC5032997 DOI: 10.1111/all.12644] [Citation(s) in RCA: 393] [Impact Index Per Article: 43.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 05/02/2015] [Indexed: 01/22/2023]
Abstract
Background Chronic rhinosinusitis (CRS) can be classified into CRS with nasal polyps (CRSwNP) and CRS without nasal polyps (CRSsNP). CRSwNP displays more intense eosinophilic infiltration and the presence of Th2 cytokines. Mucosal eosinophilia is associated with more severe symptoms and often requires multiple surgeries because of recurrence; however, even in eosinophilic CRS (ECRS), clinical course is variable. In this study, we wanted to set objective clinical criteria for the diagnosis of refractory CRS. Methods This was a retrospective study conducted by 15 institutions participating in the Japanese Epidemiological Survey of Refractory Eosinophilic Chronic Rhinosinusitis (JESREC). We evaluated patients with CRS treated with endoscopic sinus surgery (ESS), and risk of recurrence was estimated using Cox proportional hazard models. Multiple logistic regression models and receiver operating characteristics curves were constructed to create the diagnostic criterion for ECRS. Results We analyzed 1716 patients treated with ESS. To diagnose ECRS, the JESREC scoring system assessed unilateral or bilateral disease, the presence of nasal polyps, blood eosinophilia, and dominant shadow of ethmoid sinuses in computed tomography (CT) scans. The cutoff value of the score was 11 points (sensitivity: 83%, specificity: 66%). Blood eosinophilia (>5%), ethmoid sinus disease detected by CT scan, bronchial asthma, aspirin, and nonsteroidal anti‐inflammatory drugs intolerance were associated significantly with recurrence. Conclusion We subdivided CRSwNP in non‐ECRS, mild, moderate, and severe ECRS according to our algorithm. This classification was significantly correlated with prognosis. It is notable that this algorithm may give useful information to clinicians in the refractoriness of CRS before ESS or biopsy.
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Ikeda K, Ueda C, Yamada K, Nakamura A, Hatsuda Y, Kawanishi S, Nishii S, Ogawa M. Carrier-mediated placental transport of cimetidine and valproic acid across differentiating JEG-3 cell layers. DIE PHARMAZIE 2015; 70:471-476. [PMID: 26373208] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
Human choriocarcinoma has been used as a model to study trophoblast transcellular drug transport in the placenta. Previous models had limitations regarding low molecular weight drug transport through the intracellular gap junction. The purpose of this study was to evaluate placental carrier-mediated transport across a differentiating JEG-3 choriocarcinoma cell (DJEGs) layer model in which the intracellular gap junction was restricted. Cimetidine is the substrate of an efflux transporter, breast cancer resistance protein (BCRP). BCRP highly expressed in the placenta, and its function in the DJEGs model was investigated. In addition, the placental drug transport of another efflux transporter, multidrug resistance-associated proteins (MRPs), and an influx transporter, monocarboxylate transporter (MCT), were examined with various substrates. Cimetidine permeated from the fetal side to the maternal side at significantly high levels and saturated in a dose-dependent manner. The permeability coefficient of a MRP substrate, fluorescein, across the DJEGs model was significantly increased by inhibiting MRP function with probenecid. On the other hand, permeation in the influx direction to the fetal side with a substrate of MCT, valproic acid, had a gentle dose-dependent saturation. These findings suggest that the DJEGs model could be used to evaluate transcellular placental drug transport mediated by major placental transporters.
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Meguro K, Suzuki K, Hosokawa J, Sanayama Y, Tanaka S, Furuta S, Ikeda K, Takatori H, Suto A, Ohara O, Nakajima H. OP0120 Roles of B Cell Leukemia/Lymphoma 3 in The Development of T Follicular Helper Cells and the Pathogenesis of Rheumatoid Arthritis. Ann Rheum Dis 2015. [DOI: 10.1136/annrheumdis-2015-eular.1917] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022]
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Yamagata M, Ikeda K, Tsushima K, Iesato K, Abe M, Ito T, Kashiwakuma D, Iwamoto I, Nakagomi D, Sugiyama T, Furuta S, Jayne D, Tatsumi K, Nakajima H. OP0239 Comprehensive Analyses of Lung Abnormalities on Chest Computed Tomography in Patients with Microscopic Polyangiitis before Receiving Immunosuppressive Treatment. Ann Rheum Dis 2015. [DOI: 10.1136/annrheumdis-2015-eular.2697] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
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Negoro T, Shimizu S, Narushima M, Banham AH, Wakabayashi H, Takayanagi R, Hagiwara T, Roncador G, Osabe T, Yanai T, Kin M, Ikeda K, Endo A, Akiyama H, Nakano Y. Elevated receptor for activated C kinase 1 expression is involved in intracellular Ca2+ influx and potentially associated with compromised regulatory T cell function in patients with asthma. Clin Exp Allergy 2015; 44:1154-69. [PMID: 25048599 DOI: 10.1111/cea.12375] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/12/2013] [Revised: 05/09/2014] [Accepted: 07/02/2014] [Indexed: 12/31/2022]
Abstract
BACKGROUND Regulatory T cells (T(regs)) are activated during anergy in response to T cell receptor (TCR) activation and functional immune suppression. Anergy of paediatric T(regs) is partially dependent on intracellular calcium mobility; following TCR activation, T(regs) do not exhibit increased intracellular Ca(2+) concentration ([Ca(2+) ](i)). OBJECTIVE We determined whether [Ca(2+) ](i) in adult T(regs) defined their anergy, if intracellular Ca(2+) movement was linked to regulatory functions, whether [Ca(2+)](i) was indicative of asthma pathology, and the potential molecular mechanism responsible for Ca(2+) movement in T(regs). METHODS T(regs) were purified by the magnetic bead method, and their regulatory functions were assessed by monitoring carboxyfluorescein succinimidyl ester-labelled responder T cell proliferation. The Ca(2+) response of Fura-2-labelled cells was measured using a video image analysis system. To analyse the functions of T(regs) at the molecular level, we generated Jurkat Tet-On(®) clones with doxycycline (Dox)-induced forkhead box P3 (FOXP3) protein expression. RESULTS CD4(+) CD25(+) CD127(-/low) T(regs) from participants without asthma did not elicit Ca(2+) influx in response to TCR activation, exhibited little proliferation and suppressed proliferation of CD4(+) CD25(-) T cells. In contrast, under similar conditions, T(regs) from patients with asthma exhibited increased [Ca(2+)](i) and robust proliferation with partial loss of regulatory functions. FOXP3 protein levels in Tet-On(®) clones were high after both 2- and 5-day Dox treatment; however, 5-day cells were comparable with T(regs) from patients with asthma, whereas 2-day cells were similar to T(regs) from participants without asthma. Increasing [Ca(2+)](i) induced a high level of receptor for activated C kinase 1 (RACK1) expression in 5-day cells. CONCLUSIONS AND CLINICAL RELEVANCE We confirmed that T(regs) in patients with asthma are functionally impaired and that the abnormal regulatory functions of these cells can be analysed by [Ca(2+)](i) following TCR engagement. Furthermore, the impaired functioning of T(regs) evident in patients with asthma may be due to a high level of RACK1.
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Tsai SH, Kinoshita M, Kusu T, Kayama H, Okumura R, Ikeda K, Shimada Y, Takeda A, Yoshikawa S, Obata-Ninomiya K, Kurashima Y, Sato S, Umemoto E, Kiyono H, Karasuyama H, Takeda K. The ectoenzyme E-NPP3 negatively regulates ATP-dependent chronic allergic responses by basophils and mast cells. Immunity 2015; 42:279-293. [PMID: 25692702 DOI: 10.1016/j.immuni.2015.01.015] [Citation(s) in RCA: 58] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/16/2014] [Revised: 08/23/2014] [Accepted: 12/09/2014] [Indexed: 12/19/2022]
Abstract
Crosslinking of the immunoglobulin receptor FcεRI activates basophils and mast cells to induce immediate and chronic allergic inflammation. However, it remains unclear how the chronic allergic inflammation is regulated. Here, we showed that ecto-nucleotide pyrophosphatase-phosphodiesterase 3 (E-NPP3), also known as CD203c, rapidly induced by FcεRI crosslinking, negatively regulated chronic allergic inflammation. Basophil and mast cell numbers increased in Enpp3(-/-) mice with augmented serum ATP concentrations. Enpp3(-/-) mice were highly sensitive to chronic allergic pathologies, which was reduced by ATP blockade. FcεRI crosslinking induced ATP secretion from basophils and mast cells, and ATP activated both cells. ATP clearance was impaired in Enpp3(-/-) cells. Enpp3(-/-)P2rx7(-/-) mice showed decreased responses to FcεRI crosslinking. Thus, ATP released by FcεRI crosslinking stimulates basophils and mast cells for further activation causing allergic inflammation. E-NPP3 decreases ATP concentration and suppresses basophil and mast cell activity.
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Castillo M, Lazaro R, Dinglasan J, Ikeda K. Case report: effects of structured intradialytic exercise on fatigue and quality of life for an acute care patient on hemodialysis. Physiotherapy 2015. [DOI: 10.1016/j.physio.2015.03.1661] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Horiuchi S, Higashi T, Ikeda K, Saishoji T, Jinnouchi Y, Sano H, Araki N. Structures of advanced glycation end products and their role in pathophysiological states. CONTRIBUTIONS TO NEPHROLOGY 2015; 112:32-41. [PMID: 7554991 DOI: 10.1159/000424090] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/25/2023]
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113
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Ikeda K, Yamashita J, Higashi S, Futami K. Modified Orbitocranial Approach for Unusual Cerebral Aneurysms of the Anterior Circulation. Skull Base Surg 2015. [DOI: 10.1159/000429941] [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]
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114
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Fujimoto M, Ikeda K, Nakamura T, Iwamoto T, Furuta S, Nakajima H. Development of mixed connective tissue disease and Sjögren's syndrome in a patient with trisomy X. Lupus 2015; 24:1217-20. [PMID: 25854827 DOI: 10.1177/0961203315580873] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/08/2015] [Accepted: 03/17/2015] [Indexed: 01/18/2023]
Abstract
Increased risk of developing systemic lupus erythematosus (SLE) has been reported in patients with Klinefelter syndrome. Here, we describe a 16-year-old Japanese patient with trisomy X (47,XXX) who developed mixed connective tissue disease (MCTD) and Sjögren's syndrome. She had polyarthritis, edematous fingers with Raynaud's phenomenon, sicca syndrome, interstitial lung disease, possible myositis, and was positive for anti-nuclear antibody, anti-nRNP antibody and rheumatoid factor. This is the first report in the literature of a case of MCTD with female polysomy X, which further supports the link between the presence of extra X chromosome(s) and the development of autoimmune diseases.
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Uno K, Nishizawa D, Seo S, Sakai N, Ohi K, Nabeshima T, Hashimoto R, Ozaki N, Ikeda K, Miyamoto Y, Nitta A. [JSNP Excellent Presentation Award for CINP2014]. NIHON SHINKEI SEISHIN YAKURIGAKU ZASSHI = JAPANESE JOURNAL OF PSYCHOPHARMACOLOGY 2015; 35:57-58. [PMID: 26027072] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
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Nishizawa D, Kasai S, Hasegawa J, Sato N, Tanioka F, Nagashima M, Ujike H, Hashimoto R, Tanaka M, Sugimura H, Ikeda K. [JSNP Excellent Presentation Award for CINP2014]. NIHON SHINKEI SEISHIN YAKURIGAKU ZASSHI = JAPANESE JOURNAL OF PSYCHOPHARMACOLOGY 2015; 35:45-46. [PMID: 26027066] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
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Sato A, Takamatsu Y, Kasai Y, Kobayashi S, Hino T, Ikeda K, Mizuguchi M. [JSNP Excellent Presentation Award for CINP2014: Tsc2 haploinsufficiency is associated with more severe autism-related behavioral deficits in mouse models of tuberous sclerosis complex]. NIHON SHINKEI SEISHIN YAKURIGAKU ZASSHI = JAPANESE JOURNAL OF PSYCHOPHARMACOLOGY 2015; 35:51-52. [PMID: 26027069] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
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Akagawa S, Morikawa N, Ikeda K, Okazaki T, Takahashi S. [Health assessment of local residents who made full use of symptomatology skills and test device]. YAKUGAKU ZASSHI 2015; 135:175-9. [PMID: 25747208 DOI: 10.1248/yakushi.14-00201-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
A strategy named "Japan is back" adopted in June 2013 specifies that pharmacies shall be regarded as community-based places where health-related information is provided, and the public shall be encouraged to use the services of pharmacies and pharmacists who can advise on health and appropriate use of over-the-counter (OTC) drugs, and promote self medication. In Japan there are approximately 55000 pharmacies and 260000 pharmacists, and community residents are recommended to use these resources. As advisors on healthcare in the community, pharmacists are required to make judgments regarding drug use in individuals performing self medication and using OTC drugs in consideration of their symptoms and level of understanding of their health conditions, and recommend that they consult a medical center if necessary. To meet these requirements pharmacists need to have the skills to monitor each individual's lifestyle, behavior, and environment as well as trends in society, and assess their health status. However, education that allows pharmacists to practice such skills remains insufficiently developed. We consider that to be able to detect diseases early among community residents and appropriately support them using pharmacotherapy, it is very important to train pharmacists to do the following at pharmacies: 1) determine individuals who should be treated early using symptomatologic skills; 2) promote public awareness of disease; and 3) perform biochemical examination (blood is collected by fingerprick promptly to obtain biochemical data) in cooperation with the Department of Clinical Pharmacotherapy, Faculty of Pharmaceutical Sciences, Hiroshima University.
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Ujihira T, Ikeda K, Suzuki T, Yamaga R, Sato W, Horie-Inoue K, Shigekawa T, Osaki A, Saeki T, Okamoto K, Takeda S, Inoue S. MicroRNA-574-3p, identified by microRNA library-based functional screening, modulates tamoxifen response in breast cancer. Sci Rep 2015; 5:7641. [PMID: 25560734 PMCID: PMC4284514 DOI: 10.1038/srep07641] [Citation(s) in RCA: 49] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Abstract] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/04/2014] [Accepted: 12/03/2014] [Indexed: 12/20/2022] Open
Abstract
Most primary breast cancers express estrogen receptor α and can be treated via endocrine therapy using anti-estrogens such as tamoxifen; however, acquired endocrine resistance is a critical issue. To identify tamoxifen response-related microRNAs (miRNAs) in breast cancer, MCF-7 cells infected with a lentiviral miRNA library were treated with 4-hydroxytamoxifen (OHT) or vehicle for 4 weeks, and the amounts of individual miRNA precursors that had integrated into the genome were evaluated by microarray. Compared to the vehicle-treated cells, 5 'dropout' miRNAs, which were downregulated in OHT-treated cells, and 6 'retained' miRNAs, which were upregulated in OHT-treated cells, were identified. Of the dropout miRNAs, we found that miR-574-3p expression was downregulated in clinical breast cancer tissues as compared with their paired adjacent tissues. In addition, anti-miR-574-3p reversed tamoxifen-mediated suppression of MCF-7 cell growth. Clathrin heavy chain (CLTC) was identified as a miR-574-3p target gene by in silico algorithms and luciferase reporter assay using the 3' untranslated region of CLTC mRNA. Interestingly, loss and gain of miR-574-3p function in MCF-7 cells causes CLTC to be upregulated and downregulated, respectively. These results suggest that functional screening mediated by miRNA libraries can provide new insights into the genes essential for tamoxifen response in breast cancer.
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Shiozawa A, Miwa M, Ono N, Homma H, Hirotsu M, Ikeda K. Comparative analysis of cytokine release from epithelial cell cultures of the upper airway. Rhinology 2015. [DOI: 10.4193/rhin14.078] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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Smith KJ, MacLeod D, Willie CK, Lewis NCS, Hoiland RL, Ikeda K, Tymko MM, Donnelly J, Day TA, MacLeod N, Lucas SJE, Ainslie PN. Influence of high altitude on cerebral blood flow and fuel utilization during exercise and recovery. J Physiol 2014; 592:5507-27. [PMID: 25362150 PMCID: PMC4270509 DOI: 10.1113/jphysiol.2014.281212] [Citation(s) in RCA: 50] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/18/2014] [Accepted: 10/18/2014] [Indexed: 11/08/2022] Open
Abstract
We examined the hypotheses that: (1) during incremental exercise and recovery following 4-6 days at high altitude (HA) global cerebral blood flow (gCBF) increases to preserve cerebral oxygen delivery (CDO2) in excess of that required by an increasing cerebral metabolic rate of oxygen ( CM RO2); (2) the trans-cerebral exchange of oxygen vs. carbohydrates (OCI; carbohydrates = glucose + ½lactate) would be similar during exercise and recovery at HA and sea level (SL). Global CBF, intra-cranial arterial blood velocities, extra-cranial blood flows, and arterial-jugular venous substrate differences were measured during progressive steady-state exercise (20, 40, 60, 80, 100% maximum workload (Wmax)) and through 30 min of recovery. Measurements (n = 8) were made at SL and following partial acclimatization to 5050 m. At HA, absolute Wmax was reduced by ∼50%. During submaximal exercise workloads (20-60% Wmax), despite an elevated absolute gCBF (∼20%, P < 0.05) the relative increases in gCBF were not different at HA and SL. In contrast, gCBF was elevated at HA compared with SL during 80 and 100% Wmax and recovery. Notwithstanding a maintained CDO2 and elevated absolute CM RO2 at HA compared with SL, the relative increase in CM RO2 was similar during 20-80% Wmax but half that of the SL response (i.e. 17 vs. 27%; P < 0.05 vs. SL) at 100% Wmax. The OCI was reduced at HA compared with SL during 20, 40, and 60% Wmax but comparable at 80 and 100% Wmax. At HA, OCI returned almost immediately to baseline values during recovery, whereas at SL it remained below baseline. In conclusion, the elevations in gCBF during exercise and recovery at HA serve to maintain CDO2. Despite adequate CDO2 at HA the brain appears to increase non-oxidative metabolism during exercise and recovery.
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Tsuzawa K, Yazawa I, Shakuo T, Ikeda K, Kawakami K, Onimaru H. Effects of ouabain on respiratory rhythm generation in brainstem-spinal cord preparation from newborn rats and in decerebrate and arterially perfused in situ preparation from juvenile rats. Neuroscience 2014; 286:404-11. [PMID: 25512246 DOI: 10.1016/j.neuroscience.2014.12.006] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/22/2014] [Revised: 10/31/2014] [Accepted: 12/05/2014] [Indexed: 11/25/2022]
Abstract
The significance of Na/K-ATPase on respiratory rhythm generation is not well understood. We investigated the effects of the Na/K-ATPase blocker, ouabain, on respiratory rhythm. Experiments were performed with brainstem-spinal cord preparation from 0 to 3-day-old Wistar rats and with decerebrate and arterially perfused in situ preparation from juvenile rats (postnatal day 11-13). Newborn rat preparations were superfused at a rate of 3.0 ml/min with artificial cerebrospinal fluid, equilibrated with 95% O2 and 5% CO2, pH 7.4, at 26-27 °C. Inspiratory activity was monitored from the fourth cervical ventral root (C4). Application of ouabain (15-20 min) resulted in a dose-dependent increase in the burst rate of C4 inspiratory activity. After washout, the burst rate further increased to reach quasi-maximum values under each condition (e.g. 183% of control in 1 μM, 253% in 10 μM, and 303% in 20 μM at 30 min washout). Inspiratory or pre-inspiratory neurons in the rostral ventrolateral medulla were depolarized. We obtained similar results (i.e. increased phrenic burst rate) in an in situ perfused preparation of juvenile rats. Genes encoding the Na/K-ATPase α subunit were expressed in the region of the parafacial respiratory group (pFRG) in neonatal rats, suggesting that cells (neurons and/or glias) in the pFRG were one of the targets of ouabain. We concluded that Na/K-ATPase activity could be an important factor in respiratory rhythm modulation.
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Hara T, Suzuki F, Kawamura Y, Sezaki H, Hosaka T, Akuta N, Kobayashi M, Suzuki Y, Saitoh S, Arase Y, Ikeda K, Kobayashi M, Watahiki S, Mineta R, Kumada H. Long-term entecavir therapy results in falls in serum hepatitis B surface antigen levels and seroclearance in nucleos(t)ide-naïve chronic hepatitis B patients. J Viral Hepat 2014; 21:802-8. [PMID: 25274427 DOI: 10.1111/jvh.12211] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/26/2013] [Accepted: 10/08/2013] [Indexed: 12/12/2022]
Abstract
Entecavir (ETV) is reported to result in suppression of hepatitis B virus DNA (HBV DNA) replication with minimal drug resistance. However, information on the long-term effect of such therapy on serum hepatitis B surface antigen (HBsAg) level and elimination of HBsAg is not available. ETV therapy was started in 553 nucleos(t)ide-naïve patients with chronic hepatitis B infection (HBeAg positive: 45%) in our hospital. Serum HBsAg levels were measured serially by the Architect assay. The median baseline HBsAg was 2180 IU/mL (0.12-243 000 IU/mL), and median follow-up period was 3.0 years, with 529, 475, 355, 247 and 163 patients followed-up for 1, 2, 3, 4 and 5 years, respectively. At year 5, the mean log HBsAg decline from baseline was -0.48 log IU/mL, and the cumulative HBsAg clearance rate was 3.5%. Multivariate analysis identified HBV DNA level at baseline (<3.0 log copies IU/mL, odd ratio = 10.2; 95% confidence interval = 1.87-55.5, P = 0.007) and HBsAg level (<500 IU/mL, odd ratio = 29.4; 95% confidence interval = 2.80-333, P = 0.005) as independent predictors of HBsAg seroclearance. These results indicate that although serum HBsAg level declines gradually during ETV therapy, HBsAg seroclearance remains a rare event.
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Inoue S, Horie-Inoue K, Ikeda K. 309 RNA sequencing and in silico analysis identifies an unannotated antisense long non-coding RNA involved in cancer progression. Eur J Cancer 2014. [DOI: 10.1016/s0959-8049(14)70435-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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Yokoyama J, Ohba S, Fujimaki M, Anzai T, Kojima M, Ikeda K, Suzuki M, Yoshimoto H, Inoue K. Impact of intra-arterial chemotherapy including internal carotid artery for advanced paranasal sinus cancers involving the skull base. Br J Cancer 2014; 111:2229-34. [PMID: 25255100 PMCID: PMC4264436 DOI: 10.1038/bjc.2014.501] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/16/2014] [Revised: 06/02/2014] [Accepted: 08/18/2014] [Indexed: 11/29/2022] Open
Abstract
Background: The most significant problem of intra-arterial chemotherapy for advanced paranasal sinus carcinomas and residual cancers supplied by internal carotid artery (ICA) and involving the skull base is the lack of salvage therapies. Objective: The objective of the study was to evaluate the usefulness of intra-arterial chemotherapy including ICA infusion for treating advanced paranasal sinus carcinomas, which have invaded the skull base. Methods: Forty-six patients with advanced paranasal sinus carcinomas supplied by ICA were treated by intra-arterial chemotherapy using CDDP and sodium thiosulphate (STS) as a neutraliser of CDDP toxicity. After evaluating CT angiography, 150 mg m−2 of CDDP was superselectively administered weekly to each feeding artery including ICA four times. Results: The 10-year overall survival rate and progression-free survival rate were 70.7 and 60.2%, respectively. Compared with control group without infusing ICA, recurrences at anterior skullbase or anterior ethomoid sinus were significantly diminished. Of 32 patients in which the orbital apex had been invaded, 29 patients were treated with successful preservation of orbital contents. The CT angiography could efficiently determine all feeding arteries supplying the cancers. Consequently, chemotherapy could be administered on schedule, and side effects were minimal and acceptable. Conclusions: This new method has promising applications in the treatment of advanced paranasal sinus carcinomas involving the skull base.
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