26
|
Toya C, Higuchi K, Iwai S, Hirotaka M, Tsunamoto H, Matsumoto S, Ozawa T, Araki K, Ohnishi T, Kobayashi I, Ohnishi Y, Umezawa S, Niwa A, Yokoyama Y, Hirao K. P341Comparison of locations between continuous wavelet transform analysis and complex fractionated atrial electrogram in patients with persistent atrial fibrillation. Europace 2017. [DOI: 10.1093/ehjci/eux141.067] [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
|
27
|
Iwai S, Takahashi Y, Masumura M, Yamashita S, Doi J, Yamamoto T, Sakakibara A, Nomoto H, Yoshida Y, Sugiyama T, Oumi T, Ohno M, Sato Y, Hirao K, Isobe M. Occurrence of Focal Atrial Tachycardia During the Ablation Procedure Is Associated With Arrhythmia Recurrence After Termination of Persistent Atrial Fibrillation. J Cardiovasc Electrophysiol 2017; 28:489-497. [PMID: 28188960 DOI: 10.1111/jce.13187] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/05/2016] [Revised: 01/23/2017] [Accepted: 02/06/2017] [Indexed: 11/30/2022]
Abstract
INTRODUCTION Catheter ablation can terminate persistent atrial fibrillation (AF). However, atrial tachycardia (AT) often arises after termination of AF. METHODS AND RESULTS Of 215 patients who underwent index stepwise ablation for persistent AF, 141 (66%) patients (64 ± 9 years) in whom AF terminated during the ablation procedure were studied. If AF converted into AT, ablation for AT was subsequently performed. ATs were categorized as focal or macroreentrant AT. We assessed whether type of AT occurring after conversion of AF during the ablation procedure was associated with freedom from atrial tachyarrhythmia (AF or AT) during follow-up. Sinus rhythm was directly restored from AF in 37 patients, while 34, 37, and 33 patients had focal AT alone, a mix of focal and macroreentrant AT, and macroreentrant AT alone after termination of AF, respectively. Arrhythmia-free survival rates at 1 year after the index procedure were 30%, 34%, 61%, and 59% in the patients with focal AT alone, a mix of focal AT and macroreentrant AT, macroreentrant AT alone, and direct restoration of sinus rhythm, respectively (P = 0.004). Type of AT occurring during the index procedure was associated with type of recurrent AT (P = 0.03), but the origin of focal AT occurring during the index ablation differed from that of the recurrent AT in 85% of patients. CONCLUSION In patients who had AF termination by ablation, occurrence of focal AT during the ablation procedure was associated with worse clinical outcome than occurrence of macroreentrant AT, likely due to ATs arising from other foci during follow-up.
Collapse
|
28
|
Takasu A, Masui A, Hamada M, Imai T, Iwai S, Yura Y. Immunogenic cell death by oncolytic herpes simplex virus type 1 in squamous cell carcinoma cells. Cancer Gene Ther 2016; 23:107-13. [PMID: 26987291 DOI: 10.1038/cgt.2016.8] [Citation(s) in RCA: 48] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/01/2015] [Revised: 02/15/2016] [Accepted: 02/19/2016] [Indexed: 02/06/2023]
Abstract
Molecules essential for the induction of immunogenic cell death (ICD) are called damage-associated molecular patterns (DAMPs). The effects of oncolytic herpes simplex virus type 1 (HSV-1) on the production of DAMPs were examined in squamous cell carcinoma (SCC) cells. The cytopathic effects of HSV-1 RH2 were observed in mouse SCCVII cells infected at a high multiplicity of infection (MOI), and the amounts of viable cells were decreased. After being infected with RH2, ATP and high mobility group box 1 (HMGB1) were released extracellulary, while calreticulin (CRT) translocated to the cell membrane. A flow-cytometric analysis revealed an increase in the number of annexin-V and propidium iodide (PI)-stained cells; and the amount of cleaved poly (ADP-ribose) polymerase (PARP) was increased. The killing effect of RH2 was reduced by pan-caspase inhibitor z-VAD-fmk and the caspase-1 inhibitor z-YVAD-fmk, suggesting the involvement of apoptosis and pyroptosis. In C3H mice bearing synergic SCCVII tumors, the growth of tumors injected with the supernatant of RH2-infected cells was less than that of tumors injected with phosphate-buffered saline (PBS). These results indicate that oncolytic HSV-1 RH2 produces DAMPs from SCC cells to induce cell death. This may contribute to the enhancement of tumor immunity by oncolytic HSV-1.
Collapse
|
29
|
Avilés-Jiménez F, Guitron A, Segura-López F, Méndez-Tenorio A, Iwai S, Hernández-Guerrero A, Torres J. Microbiota studies in the bile duct strongly suggest a role for Helicobacter pylori in extrahepatic cholangiocarcinoma. Clin Microbiol Infect 2015; 22:178.e11-178.e22. [PMID: 26493848 DOI: 10.1016/j.cmi.2015.10.008] [Citation(s) in RCA: 52] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/27/2015] [Revised: 10/01/2015] [Accepted: 10/05/2015] [Indexed: 02/07/2023]
Abstract
Biliary tract cancer or extrahepatic cholangiocarcinoma (ECCA) represents the sixth commonest cause of cancer in the gastrointestinal tract in western countries. We aimed to characterize the microbiota and its predicted associated functions in the biliary tract of ECCA and benign biliary pathology (BBP). Samples were taken from 100 patients with ECCA and 100 patients with BBP by endoscopic cholangio-pancreatography for DNA extraction. Ten patients with ECCA and ten with BBP were selected for microbiota studies using the V4-16S rRNA gene and sequenced in Illumina platform. Microbiota analyses included sample-to-sample distance metrics, ordination/clustering and prediction of functions. Presence of Nesterenkonia sp. and Helicobacter pylori cagA and vacA genes were tested in the 100 ECCA and 100 BBP samples. Phylum Proteobacteria dominated all samples (60.4% average). Ordination multicomponent analyses showed significant microbiota separation between ECCA and BBP (p 0.010). Analyses of 4002 operational taxonomic units with presence variation in at least one category probed a separation of ECCA from BBP. Among these, Nesterenkonia decreased, whereas Methylophilaceae, Fusobacterium, Prevotella, Actinomyces, Novosphingobium and H. pylori increased in ECCA. Predicted associated functions showed increased abundance of H. pylori virulence genes in ECCA. cagA and vacA genes were confirmed by PCR in ECCA and BBP samples. This is the first microbiota report in ECCA and BBP to show significant changes in microbial composition. Bacterial species unusual for human flora were found: Methylophilaceae and Nesterenkonia are reported in hypersaline soils, and Mesorhizobium is a nitrogen-fixing bacterium. Enrichment of virulence genes confirms previous studies suggesting that H. pylori might be associated with ECCA.
Collapse
|
30
|
Iwai S, Takeshita A, Kishimoto S, Morita Y, Niki-Yonekawa A, Hamada M, Yura Y. 178 Wnt5b promotes the cell invasion and migration essential to the metastasis of oral squamous cell carcinoma cell through activation of Cdc42 and RhoA. Eur J Cancer 2015. [DOI: 10.1016/s0959-8049(16)30075-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
|
31
|
Chiba J, Aoki S, Yamamoto J, Iwai S, Inouye M. Deformable nature of various damaged DNA duplexes estimated by an electrochemical analysis on electrodes. Chem Commun (Camb) 2015; 50:11126-8. [PMID: 25105179 DOI: 10.1039/c4cc04513k] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
Abstract
We report bending flexibility of damaged duplexes possessing an apurinic/apyrimidinic (AP) site analogue, a cyclobutane pyrimidine dimer (CPD), and a pyrimidine(6-4)pyrimidone photoproduct (6-4PP). Based on the electrochemical evaluation on electrodes, the duplex flexibilities of the lesions increased in the following order: CPD < AP < 6-4PP. We discussed the possibility that the emerging local flexibility might be a good sign for UV-damaged DNA-binding proteins on duplexes.
Collapse
|
32
|
Takahashi K, Ogura N, Tomoki R, Eda T, Okada H, Kato R, Iwai S, Ito K, Kuyama K, Kondoh T. Applicability of human dental follicle cells to bone regeneration without dexamethasone: an in vivo pilot study. Int J Oral Maxillofac Surg 2015; 44:664-9. [DOI: 10.1016/j.ijom.2014.11.006] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/04/2014] [Revised: 10/27/2014] [Accepted: 11/07/2014] [Indexed: 11/24/2022]
|
33
|
Ohtsubo T, Nishioka K, Imaiso Y, Iwai S, Shimokawa H, Oda H, Fujiwara T, Nakabeppu Y. Identification of human MutY homolog (hMYH) as a repair enzyme for 2-hydroxyadenine in DNA and detection of multiple forms of hMYH located in nuclei and mitochondria. Nucleic Acids Res 2015; 43:3870-1. [PMID: 25800745 PMCID: PMC4402549 DOI: 10.1093/nar/gkv264] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022] Open
|
34
|
Iwai S, Sakonju I, Okano S, Teratani T, Kasahara N, Yokote S, Yokoo T, Kobayash E. Impact of ex vivo administration of mesenchymal stem cells on the function of kidney grafts from cardiac death donors in rat. Transplant Proc 2015; 46:1578-84. [PMID: 24935331 DOI: 10.1016/j.transproceed.2013.12.068] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/18/2013] [Revised: 10/09/2013] [Accepted: 12/16/2013] [Indexed: 12/12/2022]
Abstract
BACKGROUND Mesenchymal stem cells (MSCs) have been applied to the treatment of various diseases, and MSC administration in marginal donor grafts may help avoid the ischemia-reperfusion injury associated with solid organ transplants. Given the reports of side effects after intravenous MSC administration, local MSC administration to the target organ might be a better approach. We administered adipose tissue-derived MSCs (AT-MSCs) ex vivo to donor rat kidneys obtained after cardiac death (CD). METHODS Using male Lewis rats (8-10 weeks), and a marginal transplant model of 1hr CD plus 1hr sub-normothermic ET-Kyoto solution preservation were conducted. AT-MSCs obtained from double-reporter (luciferase-LacZ) transgenic Lewis rats were injected either systemically (1.0 × 10(6) cells/0.5 mL) to bilaterally nephrectomized recipient rats that had received a marginal kidney graft (n = 6), or locally via the renal artery (500 μL ET-Kyoto solution containing the same number of AT-MSCs) to marginal kidney grafts, which were then preserved (1 hour; 22°C) before being transplanted into bilaterally nephrectomized recipient rats (n = 8). Serum was collected to assess the therapeutic effects of AT-MSC administration, and the recipients of rats surviving to Day 14 were separately evaluated histopathologically. Follow-up was by in vivo imaging and histological LacZ staining, and tumor formation was evaluated in MSC-injected rats at 3 months. RESULTS Systemic injection of MSC did not improve recipient survival. In vivo imaging showed MSCs trapped in the lung that later became undetectable. Ex vivo injection of MSCs did show a benefit without adverse effects. At Day 14 after RTx, 75% of the rats in the AT-MSC-injected group (MSC[+]) had survived, whereas 50% of the rats in the AT-MSC-non-injected group (MSC[-]) had died. Renal function in the MSC(+) group was improved compared with that in the MSC(-) group at Day 4. LacZ staining revealed AT-MSCs attached to the renal tubules at 24 hours after RTx that later became undetectable. Histopathologic examination showed little difference in fibrosis between the groups at Day 14. No teratomas or other abnormalities were seen at 3 months.
Collapse
|
35
|
Eda T, Takahashi K, Iwai S, Tomoki R, Okada H, Ito K, Kuyama K, Suemitu M, Ogura N, Tukahara H, Kondoh T. Effect of Plasma Rich in Growth Factors and Platelet-Rich Plasma on Bone Formation in Rat Calvaria. J Oral Maxillofac Surg 2014. [DOI: 10.1016/j.joms.2014.06.335] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
|
36
|
Yura Y, Okunaga S, Takasu A, Hamada M, Iwai S. Low-intensity ultrasound as a method to improve the effect of oncolytic virotherapy on oral cancer. J Oral Maxillofac Surg 2014. [DOI: 10.1016/j.joms.2014.06.204] [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]
|
37
|
Fujita K, Kabata T, Maeda T, Kajino Y, Iwai S, Kuroda K, Hasegawa K, Tsuchiya H. The use of the transverse acetabular ligament in total hip replacement. Bone Joint J 2014; 96-B:306-11. [DOI: 10.1302/0301-620x.96b3.32726] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Abstract
It has recently been reported that the transverse acetabular ligament (TAL) is helpful in determining the position of the acetabular component in total hip replacement (THR). In this study we used a computer-assisted navigation system to determine whether the TAL is useful as a landmark in THR. The study was carried out in 121 consecutive patients undergoing primary THR (134 hips), including 67 dysplastic hips (50%). There were 26 men (29 hips) and 95 women (105 hips) with a mean age of 60.2 years (17 to 82) at the time of operation. After identification of the TAL, its anteversion was measured intra-operatively by aligning the inferomedial rim of the trial acetabular component with the TAL using computer-assisted navigation. The TAL was identified in 112 hips (83.6%). Intra-observer reproducibility in the measurement of anteversion of the TAL was high, but inter-observer reproducibility was moderate. Each surgeon was able to align the trial component according to the target value of the angle of anteversion of the TAL, but it was clear that methods may differ among surgeons. Of the measurements of the angle of anteversion of the TAL, 5.4% (6 of 112 hips) were outliers from the safe zone. In summary, we found that the TAL is useful as a landmark when implanting the acetabular component within the safe zone in almost all hips, and to prevent it being implanted in retroversion in all hips, including dysplastic hips. However, as anteversion of the TAL may be excessive in a few hips, it is advisable to pay attention to individual variations, particularly in those with severe posterior pelvic tilt. Cite this article: Bone Joint J 2014;96-B:306–11.
Collapse
|
38
|
Fujita K, Kabata T, Maeda T, Kajino Y, Iwai S, Kuroda K, Hasegawa K, Tsuchiya H. The use of the transverse acetabular ligament in total hip replacement: An analysis of the orientation of the trial acetabular component using a navigation system. Bone Joint J 2014. [PMID: 24589783 DOI: 10.1302/0301-620x.96b3] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 04/21/2023]
Abstract
It has recently been reported that the transverse acetabular ligament (TAL) is helpful in determining the position of the acetabular component in total hip replacement (THR). In this study we used a computer-assisted navigation system to determine whether the TAL is useful as a landmark in THR. The study was carried out in 121 consecutive patients undergoing primary THR (134 hips), including 67 dysplastic hips (50%). There were 26 men (29 hips) and 95 women (105 hips) with a mean age of 60.2 years (17 to 82) at the time of operation. After identification of the TAL, its anteversion was measured intra-operatively by aligning the inferomedial rim of the trial acetabular component with the TAL using computer-assisted navigation. The TAL was identified in 112 hips (83.6%). Intra-observer reproducibility in the measurement of anteversion of the TAL was high, but inter-observer reproducibility was moderate. Each surgeon was able to align the trial component according to the target value of the angle of anteversion of the TAL, but it was clear that methods may differ among surgeons. Of the measurements of the angle of anteversion of the TAL, 5.4% (6 of 112 hips) were outliers from the safe zone. In summary, we found that the TAL is useful as a landmark when implanting the acetabular component within the safe zone in almost all hips, and to prevent it being implanted in retroversion in all hips, including dysplastic hips. However, as anteversion of the TAL may be excessive in a few hips, it is advisable to pay attention to individual variations, particularly in those with severe posterior pelvic tilt.
Collapse
|
39
|
Tani K, Iwai S, Kosako T. Biokinetic analysis code development and applications to visualise the distribution of intake activity. RADIATION PROTECTION DOSIMETRY 2013; 157:323-330. [PMID: 23771957 DOI: 10.1093/rpd/nct153] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/02/2023]
Abstract
Measurements for internal dose assessment are required to be conducted based on the distribution of radionuclides in the body, which may change depending on the lapsed time. In this study, a biokinetic analysis code, which can be used in practical radiation control is developed, and the results of (60)Co and (137)Cs biokinetics are visualised as examples by drawing the depositions for each organ and tissue in a figure of the body as a function of lapsed time. In addition, based on visualised biokinetics, precautions for in vivo measurements are also discussed. These discussions led to the conclusion that the information of visualised biokinetics is useful for actual measurements in practical radiation control.
Collapse
|
40
|
Meshii N, Takahashi G, Okunaga S, Hamada M, Iwai S, Takasu A, Ogawa Y, Yura Y. Enhancement of systemic tumor immunity for squamous cell carcinoma cells by an oncolytic herpes simplex virus. Cancer Gene Ther 2013; 20:493-8. [PMID: 23887644 DOI: 10.1038/cgt.2013.45] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/28/2013] [Revised: 06/07/2013] [Accepted: 06/15/2013] [Indexed: 01/13/2023]
Abstract
RH2 is a neurovirulent γ134.5 gene-deficient herpes simplex virus type 1 (HSV-1) with a lytic ability in human squamous cell carcinoma (SCC) cells; it is related to spontaneously occurring HSV-1 mutant HF10. The effect of RH2 on SCC was examined using a syngeneic C3H mouse model. After infection of mouse SCCVII cells with RH2, cell viability was decreased at first, but recovered by prolonged culture, indicating the limited replication of RH2. The antitumor ability of RH2 was examined using a bilateral SCCVII tumor model. The growth of the RH2-injected tumors was suppressed compared with that of phosphate-buffered saline-injected tumors. Moreover, the growth of contralateral tumor of RH2-treated mice was also suppressed significantly. The splenocytes of C3H mice treated with RH2 lysed more SCCVII cells than NFSaY83 cells and YAC-1 cells. The cytotoxicity of the splenocytes on SCCVII cells was significantly greater than that of splenocytes from tumor-bearing mice. Removal of CD8(+) T cells from splenocytes decreased their cell killing activity remarkably. The antitumor effect of RH2 on SCCVII xenografts in nude mice was not demonstrated. These results indicate that RH2 exhibited a suppressive effect on mouse SCC, even if the replication of RH2 was limited. This is ascribed to the ability of RH2 to enhance existing tumor-specific cytotoxic T lymphocyte activity.
Collapse
|
41
|
Itoh K, Itoh H, Naka M, Saito S, Hosako I, Yoneyama N, Ishihara S, Sasaki T, Iwai S. Collective excitation of an electric dipole on a molecular dimer in an organic dimer-Mott insulator. PHYSICAL REVIEW LETTERS 2013; 110:106401. [PMID: 23521274 DOI: 10.1103/physrevlett.110.106401] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/06/2012] [Revised: 12/21/2012] [Indexed: 06/01/2023]
Abstract
The terahertz response in 10-100 cm(-1) was investigated in an organic dimer-Mott (DM) insulator κ-(ET)(2)Cu(2)(CN)(3) that exhibits a relaxorlike dielectric anomaly. An ~30 cm(-1) band in the optical conductivity was attributable to collective excitation of the fluctuating intradimer electric dipoles that are formed by an electron correlation. We succeeded in observing photoinduced enhancement of this ~30 cm(-1) band, reflecting the growth of the electric dipole cluster in the DM phase. Such optical responses in κ-(ET)(2)Cu(2)(CN)(3) reflect an instability near the boundary between the DM-ferroelectric charge ordered phases.
Collapse
|
42
|
Iwai S, Kawakami Y, Ishikawa T, Sakurai Y, Itoh H, Yamamoto K, Sasaki T. Coherent Electron Dynamics in 10 fs Time Scale in Organic Charge Ordered and Dimer-Mott Insulators. EPJ WEB OF CONFERENCES 2013. [DOI: 10.1051/epjconf/20134103019] [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
|
43
|
Ishikawa T, Yamada K, Itoh H, Iwai S, Arima T, Yamada S, Sasaki T. Photoinduced Coherent Spin Fluctuation in Primary Dynamics of Insulator to Metal Transition in Perovskite Cobalt Oxide. EPJ WEB OF CONFERENCES 2013. [DOI: 10.1051/epjconf/20134103013] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
|
44
|
Kurabayashi M, Okishige K, Asano M, Suzuki H, Shimura T, Iwai S, Kato N, Ihara K, Aoyagi H, Isobe M. Cardiopulmonary arrest caused by coronary spasm after coronary vasodilator withdrawal during the peri-operative period of gastrectomy. Intern Med 2013; 52:81-4. [PMID: 23291678 DOI: 10.2169/internalmedicine.52.8918] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
Calcium antagonists, nicorandil and long-acting nitrates are highly effective for preventing coronary spasm. The withdrawal of coronary vasodilators, especially calcium antagonists, is risky in cases of vasospastic angina. We herein present a case of cardiopulmonary arrest that occurred due to coronary spasm triggered by the discontinuation of coronary vasodilators during the peri-operative period of gastrectomy. Vasospastic angina patients who are not able to take oral coronary vasodilators in the peri-operative period should be maintained on a parenteral vasodilator until they are able to take them orally. Physicians should also be aware of the possible development of nitrate tolerance in patients on prolonged nitrate therapy.
Collapse
|
45
|
Itoh K, Itoh H, Iwai S, Naka M, Ishihara S, Saito S, Yoneyama N, Sasaki T. Photoinduced Growth of Ferroelectric Charge Order in Organic Dimer-Mott insulator. EPJ WEB OF CONFERENCES 2013. [DOI: 10.1051/epjconf/20134103020] [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
|
46
|
Kodama M, Iwai S, Onoue M, Yano Y, Takayama T, Yoshimi K, Otsuka H, Hashimoto N, Saeki N, Funato T. Endometrium Thinning by Dienogest before Hysteroscopoic Surgery. J Minim Invasive Gynecol 2012. [DOI: 10.1016/j.jmig.2012.08.677] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
|
47
|
Mazaki T, Ishii Y, Fujii M, Iwai S, Ishikawa K. Mutations of p53, E-cadherin, alpha- and beta-catenin genes and tyrosine phosphorylation of beta-catenin in human gastric carcinomas. Int J Oncol 2012; 9:579-83. [PMID: 21541555 DOI: 10.3892/ijo.9.3.579] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
We investigated whether dysfunction of p53 and E-cadherin participate in invasiveness and metastasis of human gastric carcinoma. We examined twenty-five human gastric carcinomas for p53, E-cadherin, alpha- and beta-catenin gene alteration by the reverse transcription-polymerase chain reaction-single strand conformation polymorphism (RT-PCR-SSCP) method and sequencing analysis. Three samples (13%) showed p53 gene mutation (two missense mutations and 6 bp deletion). 25% (3/12) of the carcinomas with lymph node metastasis had p53 gene mutations. One sample (4%) showed E-cadherin silent mutation. We were not able to detect alpha- or beta-catenin gene alteration. Therefore we investigated tyrosine-phosphorylation of E-cadherin, a and beta-catenin. Tyrosine-phosphorylated beta-catenin was detected in 13% (2/15) of poorly differentiated carcinomas. These results suggest that the p53 gene mutations have some correlation with lymph node metastasis, and tyrosine phosphorylation of beta-catenin rather than cadherin/catenin gene mutation is at least partly responsible for the loosening of cell-cell contact and invasiveness of poorly differentiated carcinomas.
Collapse
|
48
|
Aonuma H, Ogura N, Takahashi K, Fujimoto Y, Iwai S, Hashimoto H, Ito K, Kamino Y, Kondoh T. Characteristics and osteogenic differentiation of stem/progenitor cells in the human dental follicle analyzed by gene expression profiling. Cell Tissue Res 2012; 350:317-31. [PMID: 22890370 DOI: 10.1007/s00441-012-1477-6] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/24/2011] [Accepted: 06/25/2012] [Indexed: 12/11/2022]
Abstract
The dental follicle is an ectomesenchymal tissue that surrounds developing tooth germ and that contains osteoblastic-lineage-committed stem/progenitor cells. We examined the osteogenic potential of human dental follicle cells (hDFC) by microarray analysis. We first compared the characteristics of hDFC with those of human bone marrow mesenchymal stem cells (hMSC). Like hMSC, hDFC expressed stem cell markers such as STRO-1 and Notch-1 and differentiated not only into the osteoblastic lineage, but also into the adipogenic lineage. We analyzed the gene expression profiles of hDFC and hMSC that were not differentiated toward the osteogenic lineage. The expression of cell markers and growth factor receptors by hDFC and hMSC was similar, whereas the expression pattern of homeobox genes differed between hDFC and hMSC. Next, we investigated gene expression in hDFC during osteogenic differentiation. Gene expression profiles were analyzed in hDFC cultured in osteogenic induction medium (OIM) or in growth medium (GM) for 3 and 10 days. Many genes whose expression was regulated under these conditions were functionally categorized as "transcription" genes. Osteogenic markers were up-regulated in hDFC during osteogenic differentiation, whereas neurogenic markers were down-regulated. The genes whose expression was regulated in hDFC during osteogenic differentiation were further analyzed by ingenuity pathway analysis and real-time polymerase chain reaction. Bone morphogenetic protein and transforming growth factor-β signaling pathways were activated in hDFC cultured in OIM for 3 days. This study indicates that the dental follicle contains stem cells and/or osteoblastic progenitor cells and is a potential cellular resource for bone regeneration therapy.
Collapse
|
49
|
Iwai S, Kiguchi N, Kobayashi Y, Fukazawa Y, Saika F, Ueno K, Yamamoto C, Kishioka S. Inhibition of morphine tolerance is mediated by painful stimuli via central mechanisms. Drug Discov Ther 2012; 6:31-37. [PMID: 22460426] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
Tolerance to morphine analgesia following repeated administration disturbs the continuation of opioid therapy for severe pain. Emerging evidence suggests that the development of morphine tolerance may be antagonized by painful stimuli. To clarify the detailed mechanisms of these phenomena, we examined the effects of several pain stimuli on morphine-induced tolerance. Subcutaneous (s.c.) injection of morphine (10 mg/kg) produced an analgesic effect, which was evaluated by tail-pinch test. Morphine-induced analgesia was diminished by repeated administration of morphine (10 mg/kg, s.c.) once a day for 5 days, demonstrating the development of tolerance. Morphine analgesic tolerance was suppressed by nerve injury-induced neuropathic pain and formalin- or carrageenan-induced inflammatory pain. Tolerance to serum corticosterone elevation by morphine (10 mg/kg), which was evaluated by fluorometric assay, was also suppressed by formalin-induced inflammatory pain. Moreover, morphine analgesia induced by intracerebroventricular (10 nmol) or intrathecal (5 nmol) injection was diminished by repeated administration of morphine s.c., and this was also suppressed by carrageenan-induced inflammatory pain. These results suggest that morphine tolerance is inhibited by several pain stimuli, including neuropathic and inflammatory pain, through central mechanisms.
Collapse
|
50
|
Ihara K, Nitta J, Sato A, Iwai S, Asano M, Kanoh M, Muramatsu K, Yamato T, Matsumura Y, Takei K, Asakawa K, Hirao K, Isobe M. Coexistence of Left-Sided Atrioventricular Accessory Pathways With a Common Inferior Pulmonary Vein Ostium. Circ Arrhythm Electrophysiol 2011; 4:310-7. [DOI: 10.1161/circep.110.960815] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Background—
As the technique for radiofrequency catheter ablation for atrial fibrillation (AF) has progressed, so has our knowledge of both normal and abnormal anatomy of the left atrium and pulmonary veins (PV). We treated several AF patients with accessory conduction pathways (ACP) who were also found to have a common ostium of inferior PVs (CIPV), a relatively rare PV anomaly. No relation between ACP and PV anomalies has ever been reported, and the aim of our study was to study this association.
Methods and Results—
This study included 137 consecutive patients (104 men; mean age, 60±9 years) who underwent AF ablation for paroxysmal and persistent AF at our institution from March 2009 to August 2010. We analyzed coexisting supraventricular tachycardias and left atrium and PV morphology by multidetector row CT. Thirty-eight of 137 patients (27.7%) were found to have some PV anomaly, consisting of 13 with a common trunk of left PV, 19 with right additional PV, 3 with a common trunk of right PV, and 3 with CIPV. Thirty-one patients (22.6%) had supraventricular tachycardias. They were 26 cases of atrial flutter, 4 of Wolff-Parkinson-White syndrome, and 3 of atrioventricular nodal reentrant tachycardia. The prevalence of a coexisting ACP was significantly higher in patients with CIPV than in those without CIPV (3 of 3 [100%] versus 1 in 134 [0.7%];
P
<0.0001). All ACPs with CIPV were located in the left side. The other supraventricular tachycardias were not associated with any PV anomalies.
Conclusions—
There is a possible association between CIPV and left-sided ACP in AF patients. This suggests that there is a likelihood of developmental association between them.
Collapse
|