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Tanimura K, Nagao M, Nakajima Y, Sudo M, Kano T, Ishizaki A, Harada T, Okajima F, Tamura H, Ishii S, Sugihara H, Oikawa S. FASTING LEVEL AND DIURNAL CHANGE OF SERUM APOLIPOPROTEIN B48 CORRELATED TO CAROTID ARTERY PLAQUE IN TYPE 2 DIABETES. ATHEROSCLEROSIS SUPP 2008. [DOI: 10.1016/s1567-5688(08)70284-8] [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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Takashima K, Ohashi M, Kitamura Y, Ando K, Nagashima K, Sugihara H, Okuno K, Sairenji T, Hayashi K. A new animal model for primary and persistent Epstein-Barr virus infection: human EBV-infected rabbit characteristics determined using sequential imaging and pathological analysis. J Med Virol 2008; 80:455-66. [PMID: 18205213 DOI: 10.1002/jmv.21102] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Abstract
Most adults have persistent Epstein-Barr virus (EBV)-infection. Adolescents and young adults with primary EBV-infection frequently develop infectious mononucleosis. Latent EBV-infection is associated with various diseases, neoplasms, and hematological disorders. In vivo animal models of human EBV infection, such as non-human primates, have had limited success. A new rabbit model for primary human EBV-infection is described in this study. Seven male rabbits inoculated intravenously with EBV were sequentially imaged by ultrasonography and computed tomography, and examined for anti-EBV-VCA titer and EBV-DNA levels in blood. Six rabbits demonstrated transient splenomegaly, increased anti-EBV-VCA titers and/or EBV-DNA in blood. Transient infiltration of some EBER1-positive lymphocytes was observed in biopsied liver tissues. After splenomegaly, two rabbits tested continuously negative, two alternatively positive and negative, and one consistently positive EBV detection in blood for 470 days. One tested negative for both EBV DNA and splenomegaly. On the 14th day, mild to moderate numbers of EBER1-positive lymphocytes expressing LMP1, EBNA2, or ZEBRA infiltrated mainly in enlarged white pulps of two splenectomized materials. These cells included both B and T cells. EBV clonality analysis revealed an oligoclonal pattern. These indicate that EBV-inoculated rabbits exhibiting heterogenous host reactions are a good model for primary and persistent human EBV infection.
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Sugihara H, Shibasaki T, Tatsuguchi A, Okajima F, Wakita S, Nakajima Y, Tanimura K, Tamura H, Ishii S, Kamegai J, Akasu H, Kitagawa W, Shimizu K, Nakamura Y, Uchida E, Tajiri T, Naito Z, Katakami H, Oikawa S. A non-acromegalic case of multiple endocrine neoplasia type 1 accompanied by a growth hormone-releasing hormone-producing pancreatic tumor. J Endocrinol Invest 2007; 30:421-7. [PMID: 17598976 DOI: 10.1007/bf03346321] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Cases of acromegaly due to GHRHproducing pancreatic endocrine tumors have been reported. Here we present a case of a 31-yr-old nonacromegalic man with hyperparathyroidism and elevated serum IGF-I with normal serum GH levels. Serum GH was not suppressed below 1 ng/ml by the glucose tolerance test and increased in response to TR H and GHRH administration. Magnetic resonance imaging (MRI) revealed pituitary hyperplasia and an abdominal computed tomography (CT ) scan showed a tumor in the pancreatic tail. Plasma concentration of GHRH was elevated. Based on these clinical data, multiple endocrine neoplasia (MEN) type 1 was suspected. Three enlarged parathyroid glands were removed and a distal pancreatectomy was performed. Pathological examination of the parathyroid glands and pancreatic tumor showed nodular hyperplasia and a well-differentiated endocrine tumor, respectively, both compatible with MEN features. Immunohistochemistry revealed positive immunoreactivity for GHRH, SS , insulin, glucagon, chromogranin A, and pancreatic polypeptide in the pancreatic tumor. After pancreatic surgery, elevated levels of GHRH and IGF-I were normalized and pituitary hyperplasia definitely decreased in size. In cases of pituitary hyperplasia with elevated IGF-I, ectopic GHRH syndrome must be considered even if physical features of acromegaly are absent. It is also important to measure plasma GHRH concentrations in order to give a diagnosis.
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Okajima F, Nakajima Y, Kyoko T, Sugihara H, Ohtani S, Kotake H, Oikawa S. We-P11:96 Serum adiponectin concentration and metabolic syndrome. ATHEROSCLEROSIS SUPP 2006. [DOI: 10.1016/s1567-5688(06)81450-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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Nakajima Y, Kotake H, Tanimura K, Okajima F, Sugihara H, Oikawa S. Tu-P7:185 Inhibitory effect of T cells on APOA1-mediated cholesterol efflux through ATP-binding cassette transporter A1. ATHEROSCLEROSIS SUPP 2006. [DOI: 10.1016/s1567-5688(06)80890-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
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Lee HY, Jung HS, Fujikawa K, Park JW, Kim JM, Yukimasa T, Sugihara H, Kawai T. New antibody immobilization method via functional liposome layer for specific protein assays. Biosens Bioelectron 2005; 21:833-8. [PMID: 16242625 DOI: 10.1016/j.bios.2005.01.020] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/14/2004] [Revised: 01/26/2005] [Accepted: 01/26/2005] [Indexed: 10/25/2022]
Abstract
A specific protein assay system based on functional liposome-modified gold electrodes has been demonstrated. To fabricate such assay system, a liposome layer was initially grown on top of a gold layer. The liposome layer contained two kinds of functional molecules: biotin molecules for the binding sites of streptavidin and N-(10,12-pentacosadiynoic)-acetylferrocene molecules for the facile redox probe in electrochemical detections. Then, streptavidin was attached on the functional liposme-modified layer using the interaction of streptavidin-sbiotin complex. On the streptavidin-attached surface, antibody molecules, anti-human serum albumin antibodies could be immobilized without any secondary antibodies. AFM imaging of the streptavidin-attached liposome surface revealed a uniform distribution of closely packed streptavidin molecules. In situ quartz-crystal microbalance and electrochemical measurements demonstrated that the wanted antibody-antigen reactions should occur with high specificity and selectivity. Our specific antibody assay system, based on a functional liposome modified electrode, can be developed further to yield sophisticated structures for numerous protein chips and immunoassay sensors.
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Kawasaki T, Azuma A, Kuribayashi T, Taniguchi T, Asada S, Kamitani T, Kawasaki S, Matsubara H, Sugihara H. Enhanced vagal modulation and exercise induced ischaemia of the inferoposterior myocardium. Heart 2005; 92:325-30. [PMID: 15939725 PMCID: PMC1860800 DOI: 10.1136/hrt.2005.063230] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/21/2022] Open
Abstract
OBJECTIVE To determine whether the Bezold-Jarisch reflex or enhancement of vagal nerves, which are preferentially distributed in the inferoposterior myocardium, results from exercise induced ischaemia in this region. METHODS On the basis of exercise myocardial scintigraphy and coronary angiography, 145 patients were classified as follows: group I, 34 patients with inferoposterior ischaemia; group A, 32 with anterior ischaemia; and control, 79 without ischaemia. The relation between ischaemic areas and ECG leads with ST segment changes and vagal modulation assessed by heart rate variability (HRV) (high frequency (HF) component (0.15-0.40 Hz) and coefficient of HF component variance (CCVHF), which is the square root of HF divided by mean RR interval) were assessed. RESULTS The rate of ST segment depression in any lead did not differ between group I and group A. HF and CCV(HF) were similar before exercise but higher in group I than in group A and the control group after exercise (mean (SEM) HF: 94 (17) ms2, 41 (7) ms2, and 45 (6) ms2, respectively, p = 0.021; CCV(HF): 1.18 (0.09)%, 0.81 (0.07)%, and 0.89 (0.05)%, p = 0.0053). Furthermore, the percentage change in CCV(HF) before and after exercise was higher in group I than in group A or controls (mean (SEM) 22 (10)%, -24 (4)%, and -21 (3)%, p < 0.0001). The optimal cut off for diagnosis of inferoposterior ischaemia was -5% with a sensitivity of 74%, specificity 75%, and accuracy 75%. CONCLUSIONS Vagal modulation as assessed by HRV analysis was enhanced in association with exercise induced inferoposterior ischaemia. Exercise ECG testing combined with HRV analysis would increase accuracy in the diagnosis of ischaemic areas in selected patients with angina pectoris.
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Sakata Y, Arima K, Takeshita K, Takai T, Aoki S, Ogawa H, Sugihara H, Fujimoto K, Izuhara K. Characterization of novel squamous cell carcinoma antigen-related molecules in mice. Biochem Biophys Res Commun 2005; 324:1340-5. [PMID: 15504361 DOI: 10.1016/j.bbrc.2004.09.204] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/20/2004] [Indexed: 10/26/2022]
Abstract
The squamous cell carcinoma antigen 1 (SCCA1) and SCCA2 are unique serpins that can inhibit cysteine proteinases. SQN-5, their mouse ortholog, has already been identified, and its inhibitory property has been characterized; however, its biological role has remained undefined. Furthermore, no other mouse homolog of SQN-5 has been known. We characterize three mouse members of SCCA-related molecules including SQN-5 in this article. Serpinb3a (SQN-5) and Serpinb3b, but not Serpinb3c, were functional, inhibiting both serine and cysteine proteinases with different inhibitory profiles due to the difference of two amino acids in their reactive site loops. Serpinb3a was ubiquitously expressed in most tissues, whereas expression of Serpinb3b was limited to keratinocytes. Keratinocytes secreted both SCCA-related proteins, Serpinb3a and Serpinb3b. These results indicate that Serpinb3a and Serpinb3b may play different roles by inhibiting intrinsic or extrinsic proteinases with different expression distributions and different inhibitory profiles.
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Shiraishi M, Kamo T, Hotta M, Nemoto S, Oshima J, Sugihara H, Yasaki S, Kawakami M, Takahashi Y, Shimojo S. Usefulness of switching to cabergoline from other dopamine agonists in patients with advanced Parkinson?s disease. J Neural Transm (Vienna) 2004; 111:725-32. [PMID: 15168219 DOI: 10.1007/s00702-004-0110-6] [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] [Received: 09/02/2003] [Accepted: 01/09/2004] [Indexed: 10/26/2022]
Abstract
Problems associated with long-term treatment of advanced Parkinson's disease (PD) include motor complications and psychotic and autonomic symptoms. We switched patients from bromocriptine (BR) or pergolide (PER) to cabergoline (CB) therapy and investigated CB's usefulness in alleviating such problems. Subjects were 30 patients (mean age 68.2 years; 13 receiving BR, 17 PER) with PD complicated by effects of long-term treatment but in whom their dose of dopamine (DA) agonist was contraindicated due to adverse reactions. Patients were switched to CB over a 2-4-week period. Hoehn-Yahr and Unified Parkinson Disease Rating Scale (UPDRS) I-IV "on" and "off" scores improved in both the BR and PER groups. CB was not discontinued due to adverse reactions in any patient. In conclusion, switching to CB is useful in patients in whom it is problematic to increase their dose of DA agonist due to motor complications or psychotic symptoms of advanced PD.
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Sharpee T, Sugihara H, Kurgansky AV, Rebrik S, Stryker MP, Miller KD. Probing feature selectivity of neurons in primary visual cortex with natural stimuli. PROCEEDINGS OF SPIE--THE INTERNATIONAL SOCIETY FOR OPTICAL ENGINEERING 2004:212-222. [PMID: 18633451 DOI: 10.1117/12.548513] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/14/2022]
Abstract
One way to characterize neural feature selectivity is to model the response probability as a nonlinear function of the output of a set of linear filters applied to incoming signals. Traditionally these linear filters are measured by probing neurons with correlated Gaussian noise ensembles and calculating correlation functions between incoming signals and neural responses. It is also important to derive these filters in response to natural stimuli, which have been shown to have strongly non-Gaussian spatiotemporal correlations. An information-theoretic method has been proposed recently for reconstructing neural filters using natural stimuli in which one looks for filters whose convolution with the stimulus ensemble accounts for the maximal possible part of the overall information carried the sequence of neural responses. Here we give a first-time demonstration of this method on real neural data, and compare responses of neurons in cat primary visual cortex driven with natural stimuli, noise ensembles, and moving gratings. We show that the information-theoretic method achieves the same quality of filter reconstruction for natural stimuli as that of well-established white-noise methods. Major parameters of neural filters derived from noise ensembles and natural stimuli, as well as from moving gratings are consistent with one another. We find that application of the reverse correlation method to natural stimuli ensembles leads to significant distortions in filters for a majority of studied cells with non-zero reverse-correlation filter.
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Asada S, Kawasaki T, Sugihara H. Cardiac haematoma after coronary angioplasty. BRITISH HEART JOURNAL 2004; 90:626. [PMID: 15145861 PMCID: PMC1768276 DOI: 10.1136/hrt.2003.023960] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
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Kumagai H, Mukaisho K, Sugihara H, Bamba M, Miyashita T, Miwa K, Hattori T. Cell kinetic study on histogenesis of Barrett's esophagus using rat reflux model. Scand J Gastroenterol 2003; 38:687-92. [PMID: 12889552 DOI: 10.1080/00365520310003435] [Citation(s) in RCA: 36] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
Abstract
BACKGROUND To elucidate the histogenesis of Barrett's esophagus and esophageal adenocarcinoma, we designed a duodeno-gastric reflux model in which normal stomach function and normal nutritional status are retained. METHODS Male Wistar rats were used in the experiment. The esophago-gastric junction was side-to-side anastomosed to a loop of jejunum about 3 cm distal to Treitz's ligament. The animals were not exposed to any known carcinogens during the experiment. Sequential morphological changes were studied for up to 50 weeks after surgery. Serial sections were made and stained with hematoxylin and eosin (H&E). In addition, immunohistochemical staining for bromodeoxyuridine (BrdU) was performed along with histochemical staining for mucins using paradoxical concanavalin A (ConA), galactose oxidase Schiff (GOS), and high-iron diamine-alcian blue (HID-AB). RESULTS Severe esophagitis with squamous cell hyperplasia was noted in all animals after surgery. At week 20 after surgery, glandular metaplastic cells positive for ConA first appeared within the basal cell layer of esophageal squamous cell epithelium, and then GOS-positive cells and HID-AB goblet cells appeared. This is a characteristic of the specialized columnar epithelium of Barrett's esophagus. We detected esophageal adenocarcinomas in 1 out of 8 subjects at week 40 and in 3 out of 8 subjects at week 50 after surgery. CONCLUSIONS Reflux of duodenal contents causes specialized columnar epithelium of Barrett's esophagus and esophageal adenocarcinoma. As part of the sequence of events leading to the development of Barrett's esophagus, pyloric-foveolar metaplasia was observed followed by the appearance of intestinal goblet cells. The pyloric-foveolar metaplasia appears to be associated with chronic mucosal damage and regeneration. This multiplastic cell lineage is referred to as 'gut-regenerative cell lineage' (GRCL).
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Tokuda Y, Satoh Y, Fujiyama C, Toda S, Sugihara H, Masaki Z. Prostate cancer cell growth is modulated by adipocyte-cancer cell interaction. BJU Int 2003; 91:716-20. [PMID: 12699491 DOI: 10.1046/j.1464-410x.2003.04218.x] [Citation(s) in RCA: 63] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/31/2023]
Abstract
OBJECTIVE To assess whether adipocytes (mesenchymal stromal cells thought to affect the proliferation and differentiation of epithelial cells) affect the behaviour of prostate cancer cells in vitro, as prostate cancer metastasizes to the bone, which is an adipocyte-rich environment. MATERIALS AND METHODS The human bone-metastatic prostate carcinoma cell line PC3 was cultured with or without adipocytes in a three-dimensional collagen gel matrix. Histological and immunohistochemical assays were used to evaluate the proliferation and differentiation of PC3 cells. The cytokine expression of this culture assembly was also examined by reverse transcription-polymerase chain reaction (RT-PCR). RESULTS The proliferation and differentiation of cancer cells were clearly changed on co-culture with adipocytes compared with the control cultures. The mean (range) bromodeoxyuridine (BrdU) indices estimated (according to uptake) to evaluate the growth of the cultured cells were 36.3 (8.55)% in the co-culture and 26.95 (10.50) in the control (P < 0.02). PC3 cells in co-culture formed larger clusters than in the control, at 16.0 (11.0) vs 14.0 (10.0), respectively (P < 0.01). Cancer cells also showed pleomorphism, varying from cuboidal to spindle-shaped. The expressions of vascular endothelial and platelet-derived growth factor were greater in co-culture than in the control. CONCLUSION These findings suggest that adipocytes modulate the growth, morphology and cytokine expression of prostate cancer cells. This specific mesenchymal stromal cell type is important in the biological behaviour of prostate cancer cells.
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Okajima F, Kurihara M, Ono C, Nakajima Y, Tanimura K, Sugihara H, Nakagawa K, Miyazawa T, Oikawa S. 4P-1005 Decrease of mRNA expression of preproinsulin and secretion of insulin of HIT-T15 cell by oxidized but not acetylated low-density lipoprotein. ATHEROSCLEROSIS SUPP 2003. [DOI: 10.1016/s1567-5688(03)91263-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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Nakajima Y, Okajima F, Ono C, Tanimura K, Sugihara H, Amano M, Kazumi A, Hashimoto T, Oikawa S. 1P-0159 Amlodipine and fluvastatin ameliorate the accumulation of advanced glycation end products in atherogenic rabbit. ATHEROSCLEROSIS SUPP 2003. [DOI: 10.1016/s1567-5688(03)90233-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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Tamura H, Sugihara H, Bamba M, Tani T, Hosokawa M, Kodama M, Hattori T. Clonal analysis of esophageal squamous cell carcinoma with intraepithelial components. Pathobiology 2002; 69:289-96. [PMID: 12324705 DOI: 10.1159/000064635] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022] Open
Abstract
OBJECTIVE In tumors of the upper aerodigestive tract, field carcinogenesis is a prevailing concept which suggests that such tumors are commonly of multiclonal origin. METHODS To test this possibility, we applied a PCR-based clonality assay utilizing the polymorphic locus of the human androgen receptor gene (HUMARA) in female patients with esophageal squamous cell carcinomas (SCCs). DNA was extracted from small pieces of tissues microdissected from multiple points of intraepithelial and invasive parts of each tumor and the adjacent epithelia in 12 cases. The HUMARA locus was PCR amplified with or without prior digestion with Hpa II. PCR products were analyzed by a genetic analyzer and polyacrylamide gel electrophoresis followed by silver staining. RESULTS In each of 8 informative cases, the pattern of X chromosome inactivation of the major cell population in each sample was common among the samples from the invasive part and among those samples, if any, from the intraepithelial part, and was concordant between the intraepithelial and invasive parts in 5 cases and discordant in 1 case. Out of the samples of adjacent epithelia, a monoclonal pattern was demonstrated in 8 basal cell hyperplasias and 3 dysplasias, of which 2 and 1, respectively, showed inactivation patterns discordant with those of the concomitant cancers. CONCLUSION Esophageal SCCs may often be preceded or accompanied by multiclonal precancerous lesions, and may develop through the outgrowth of single or less commonly multiple dominant clones.
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Sugihara H, Shimokoshi K, Yasumori I. Effect of exchanged cations upon the electron spin resonance hyperfine splitting of chlorine dioxide adsorbed on X-type zeolites. ACTA ACUST UNITED AC 2002. [DOI: 10.1021/j100522a017] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Shimokoshi K, Sugihara H, Yasumori I. Electron spin resonance study of chlorine dioxide adsorbed on the alkali-cation-exchanged X-type zeolites. ACTA ACUST UNITED AC 2002. [DOI: 10.1021/j100610a020] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Peng DF, Sugihara H, Hattori T. Bromodeoxyuridine induces p53-dependent and -independent cell cycle arrests in human gastric carcinoma cell lines. Pathobiology 2002; 69:77-85. [PMID: 11752901 DOI: 10.1159/000048760] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022] Open
Abstract
OBJECTIVES This study was designed to clarify the effects of bromodeoxyuridine (BrdU) on cell cycle progression and induction of apoptosis, and to demonstrate the role of P53 in these processes. METHODS We continuously exposed four human gastric carcinoma cell lines with different P53 status (P53 wild-type AGS and MKN-45, P53-mutated MKN-28 and P53-deleted KATO-III) to BrdU in asynchronous and synchronous culture conditions, and analyzed DNA histograms of apoptotic and nonapoptotic cells determined by static DNA cytofluorometry. RESULTS Continuous exposure to 20 microM BrdU after synchronization with hydroxyurea resulted in S phase delay and G1 arrest in MKN-45 and an increase of apoptosis in the first S/G(2) phase in AGS and MKN-45. In the second S phase, a delay of 3-6 h was observed in all the four cell lines. In asynchronous cultures, continuous exposures to 20 and 200 microM BrdU for 72 h or more caused growth suppression with G(1) and G(2) arrests, respectively, in all the cell lines. CONCLUSIONS These data suggested that the BrdU-induced growth suppression of the cell lines examined was mainly caused by cell cycle arrest rather than cell death, and that the cell cycle arrests in the first S and G(1) phases (elicited by BrdU in the single DNA strand) and those in the second S, G(2) and G(1) phases (elicited by BrdU in the double DNA strands) were mediated by p53-dependent and -independent pathways, respectively.
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Nakamura K, Fujiyama C, Tokuda Y, Sugihara H, Masaki Z. Bladder cancer cell implantation in reconstructed bladder in vitro: a model of tumour recurrence. BJU Int 2002; 89:119-25. [PMID: 11849176 DOI: 10.1046/j.1464-4096.2001.01642.x] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
OBJECTIVE To evaluate the involvement of umbrella cells in tumour adhesion and growth, by examining whether human urinary bladder carcinoma cells (HUBCC) can grow on reconstructed urinary bladder mucosa in vitro, as the implantation of tumour cells after resection is thought to be a cause of bladder tumour recurrence. MATERIALS AND METHODS Normal transitional epithelial cells isolated from porcine bladder were cultured on reconstructed lamina propria using fibroblasts in type I collagen gel. The urothelium thus reconstructed was artificially injured either by a scalpel or by dilute acid, after which transitional epithelial cells began to grow in a stratified fashion within a few days of culture. A HUBCC line (HT-1197) was seeded onto this impaired mucosa to determine whether the cells could become implanted. Cultured cells on the reconstructed mucosa were evaluated by histological observation of vertical paraffin sections. RESULTS The inoculated transitional epithelial cells grew in a stratified fashion and closely resembled urothelium in vivo. The superficial cells that were in contact with the medium solution differentiated into umbrella cells. HUBCC were unable to adhere to reconstructed mucosa which had not been injured, but these cells could adhere to and become implanted on the reconstructed mucosa after it had been injured either by a scalpel or by dilute acid. After acid injury, only the surface-covering cells were removed sporadically, while the lower epithelial cell layer remained intact. The bladder cancer cells adhered to and proliferated within these stripped regions. CONCLUSION These results suggest that the urothelium, especially umbrella cells, seems to be important in preventing the adhesion and growth of urinary bladder tumour cells.
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Sugihara H, Akizawa N, Yanagisawa T, Horiuchi M, Takahashi Y, Abe M, Sakiyama T, Tadokoro M, Fujisawa K. An autopsy case of hemilaterally dominant and systematic/extensive border zone infarction: sequela of preceding atherosclerotic obstruction of one common carotid artery followed by repeated episodes of systemic hypotension. Neuropathology 2001; 21:278-87. [PMID: 11837534 DOI: 10.1046/j.1440-1789.2001.00410.x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
A 68-year-old man was admitted to St Marianna University Hospital on account of loss of consciousness with left hemiplegia. During the hospital recovery course with a rehabilitation procedure, the patient's blood pressure was very unstable, fluctuating between high (210/110 mmHg) and low (110/70 mmHg) values accompanied by a fainting sensation. A second stroke of left hemiplegia took place 1 month later. Afterwards, his condition worsened to tetraplegia with dysarthria. Three months later, lung cancer with multiple metastasis including his left neck was found and he died from adynamic ileus 6 months after the onset of the present illness. Autopsy revealed nearly complete atheromatous obstruction and more than 50% stenosis, respectively, of his right common and internal/external carotid arteries. His intracranial arterial trunks and main branches were all patent with localized atherosclerosis of only moderate degree. The pathology of the brain existed predominantly in the right hemisphere in the border zone area between the anterior and middle cerebral arteries systematically with numerous disseminated foci of complete or incomplete necrosis, white matter and gray matter being involved independently. Involvement of centrum semiovale white matter is more extensive and intensive than that of gray matter. Of the gray matter, cerebral cortex as well as striatum, periventricular (the third ventricle) gray and cerebellar cortex was involved. The specific characteristic topography and distribution of the lesions together with their histopathology are described in detail with illustration. It is concluded that this case represents an outstanding example of hemodynamic cerebral circulatory insufficiency doubly caused by hemilateral carotid artery stenosis and repeated episodes of systemic hypotension.
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Kamegai J, Tamura H, Shimizu T, Ishii S, Sugihara H, Wakabayashi I. Chronic central infusion of ghrelin increases hypothalamic neuropeptide Y and Agouti-related protein mRNA levels and body weight in rats. Diabetes 2001; 50:2438-43. [PMID: 11679419 DOI: 10.2337/diabetes.50.11.2438] [Citation(s) in RCA: 391] [Impact Index Per Article: 17.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Abstract
Ghrelin, an endogenous ligand for the growth hormone secretagogue receptor (GHS-R), was originally purified from the rat stomach. Like the synthetic growth hormone secretagogues (GHSs), ghrelin specifically releases growth hormone (GH) after intravenous administration. Also consistent with the central actions of GHSs, ghrelin-immunoreactive cells were shown to be located in the hypothalamic arcuate nucleus as well as the stomach. Recently, we showed that a single central administration of ghrelin increased food intake and hypothalamic agouti-related protein (AGRP) gene expression in rodents, and the orexigenic effect of this peptide seems to be independent of its GH-releasing activity. However, the effect of chronic infusion of ghrelin on food consumption and body weight and their possible mechanisms have not been elucidated. In this study, we determined the effects of chronic intracerebroventricular treatment with ghrelin on metabolic factors and on neuropeptide genes that are expressed in hypothalamic neurons that have been previously shown to express the GHS-R and to regulate food consumption. Chronic central administration of rat ghrelin (1 microg/rat every 12 h for 72 h) significantly increased food intake and body weight. However, it did not affect plasma insulin, glucose, leptin, or GH concentrations. We also found that chronic central administration of ghrelin increased both neuropeptide Y (NPY) mRNA levels (151.0 +/- 10.1% of saline-treated controls; P < 0.05) and AGRP mRNA levels (160.0 +/- 22.5% of saline-treated controls; P < 0.05) in the arcuate nucleus. Thus, the primary hypothalamic targets of ghrelin are NPY/AGRP-containing neurons, and ghrelin is a newly discovered orexigenic peptide in the brain and stomach.
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Ito K, Sugihara H, Tanabe T, Yuba T, Doue T, Adachi Y, Katoh S, Azuma A, Nakagawa M. [Assessment of myocardial fatty acid metabolism in patients with angina pectoris and diabetes mellitus using 123I-BMIPP myocardial scintigraphy]. KAKU IGAKU. THE JAPANESE JOURNAL OF NUCLEAR MEDICINE 2001; 38:699-705. [PMID: 11806080] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 02/23/2023]
Abstract
PURPOSE We studied the effect of myocardial ischemia and diabetes mellitus (DM) on the myocardial fatty acid metabolism using 123I-BMIPP myocardial scintigraphy. METHODS We performed 123I-BMIPP myocardial scintigraphy in 50 patients with myocardial ischemia and without DM (AP), in 30 patients with myocardial ischemia and DM (AP + DM), 12 patients with DM and without myocardial ischemia (DM), and in 10 normal subjects (N). Myocardial uptake rate of 123I-BMIPP was obtained using the time activity curve. Myocardial washout rate of 123I-BMIPP was calculated using the polar images of early and delayed SPECT images. RESULTS Myocardial uptake rate of 123I-BMIPP (%) were AP: 4.9 +/- 0.6, AP + DM: 5.5 +/- 0.5, DM 5.7 +/- 0.5 and N: 5.0 +/- 0.4. 123I-BMIPP myocardial uptake rate was increased in AP + DM and DM. 123I-BMIPP myocardial washout rate (%) were AP: 30.2 +/- 4.3, AP + DM: 24.5 +/- 3.9, DM: 16.1 +/- 2.8 and N: 19.4 +/- 3.2. 123I-BMIPP myocardial washout rate was increased in AP and AP + DM. 123I-BMIPP myocardial washout rate was increased particularly in patients with multi-vessels disease. 123I-BMIPP myocardial washout rate was decreased in DM. CONCLUSION The present study suggested that diabetes mellitus increased myocardial fatty acid uptake and decreased myocardial fatty acid washout, and that myocardial ischemia increased myocardial fatty acid washout.
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Tsukashita S, Kushima R, Bamba M, Sugihara H, Hattori T. MUC gene expression and histogenesis of adenocarcinoma of the stomach. Int J Cancer 2001; 94:166-70. [PMID: 11668493 DOI: 10.1002/ijc.1460] [Citation(s) in RCA: 89] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
To elucidate the histogenesis of adenocarcinomas of the stomach, we examined MUC gene expression in gland-forming intramucosal neoplastic lesions. Eighty tumors were histopathologically assigned to 1 of the following 3 groups based upon the Vienna classification: group A (low-grade adenoma/dysplasia), group B (high-grade adenoma/dysplasia) and group C (intramucosal carcinoma). Immunohistochemic staining was performed with monoclonal antibodies against MUC2 (goblet cell mucin), MUC5AC (gastric-foveolar mucin), MUC6 (pyloric-gland mucin) and CD10 (brush border). Ki-67 staining was also carried out. An obvious difference existed in MUC gene expression between lesions in group A and those in groups B and C. The majority of group A lesions strongly expressed intestinal markers in which proliferating cell zones were formed but generally expressed no gastric markers, whereas more than 50% of groups B and C tumors expressed gastric markers. These findings suggest that group A lesions are of a stable intestinal phenotype, whereas those in groups B and C are phenotypically and genotypically unstable, indicating that the adenoma-carcinoma sequence is not a major pathway, but instead that adenocarcinomas arise de novo.
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Islam A, Sugihara H, Hara K, Singh LP, Katoh R, Yanagida M, Takahashi Y, Murata S, Arakawa H, Fujihashi G. Dye sensitization of nanocrystalline titanium dioxide with square planar platinum(II) diimine dithiolate complexes. Inorg Chem 2001; 40:5371-80. [PMID: 11578182 DOI: 10.1021/ic010391y] [Citation(s) in RCA: 202] [Impact Index Per Article: 8.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
A series of platinum-based sensitizers of the general type Pt(NN)(SS), where NN is 4,4'-dicarboxy-2,2'-bipyridine (dcbpy) or 4,7-dicarboxy-1,10-phenanthroline (dcphen) and SS is ethyl-2-cyano-3,3-dimercaptoacrylate (ecda), quinoxaline-2,3-dithiolate (qdt), 1,2-benzenedithiolate (bdt), or 3,4-toluenedithiolate (tdt), that have various ground-state oxidation potentials has been synthesized and anchored to nanocrystalline titanium dioxide electrodes for light-to-electricity conversion in regenerative photoelectrochemical cells with an I(-)/I(-)(3) acetonitrile electrolyte. The intense mixed-Pt/dithiolate-to-diimine charge-transfer absorption bands in this series could be tuned from 440 to 580 nm by choosing appropriate dithiolate ligands, and the highest occupied molecular orbitals varied by more than 500 mV. Spectrophotometric titration of the Pt(dcphen)(bdt) complex exhibits a ground-state pK(a) value of 3.2 +/- 0.1, which can be assigned to the protonation of the carboxylate group of the dcphen ligand. Binding of Pt(dcbpy)(qdt) to porous nanostructured TiO(2) films was analyzed using the Langmuir adsorption isotherm model, yielding an adsorption equilibrium constant of 4 x 10(5) M(-1). The amount of dye adsorbed at the surface of TiO(2) films was 9.5 x 10(-8) mol/cm(2), which is ca. 50% lower than the full monolayer coverage. The resulting complexes efficiently sensitized TiO(2) over a notably broad spectral range and showed an open-circuit potential of ca. 600 mV with an impressive fill factor of > 0.70, making them attractive candidates for solar energy conversion applications. The visible spectra of the 3,4-toluenedithiol-based sensitizers showed an enhanced red response, but the lower photocurrent efficiency observed for these sensitizers stems in part from a sluggish halide oxidation rate and a fast recombination of injected electrons with the oxidized dye.
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