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Takamori S, Oku Y, Toyokawa G, Wakasu S, Kinoshita F, Watanabe K, Haratake N, Nagano T, Kosai K, Shiraishi Y, Yamashita T, Shimokawa M, Shoji F, Yamazaki K, Okamoto T, Seto T, Takeo S, Nakashima N, Okamoto I, Takenaka T. 62P Impact of the pretreatment prognostic nutritional index on the survival after first-line immunotherapy in non-small cell lung cancer patients. Ann Oncol 2022. [DOI: 10.1016/j.annonc.2022.02.071] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/01/2022] Open
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Toyokawa G, Kodama M, Haratake N, Yamada Y, Kittaka H, Takenaka T, Tanaka K, Shimokawa M, Yamazaki K, Takeo S, Okamoto I, Oda Y, Nakayama K. 1662P Comprehensive analysis of the metabolic enzymes in patients with small cell lung cancer using a large-scale targeted proteomics assay. Ann Oncol 2021. [DOI: 10.1016/j.annonc.2021.08.246] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022] Open
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Takeo S, Shoji F, Toyokawa G, Yamazaki K, Kozuma Y. Usefulness for prevention of postoperative cerebrovascular complications in patients with lung cancer using carotid ultrasonography. Ann Oncol 2019. [DOI: 10.1093/annonc/mdz435.004] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
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Toyokawa G, Shoji F, Yamazaki K, Shimokawa M, Takeo S. Significance of the red blood cell distribution width in resected pathological stage I non-small cell lung cancer. Ann Oncol 2019. [DOI: 10.1093/annonc/mdz258.015] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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Shoji F, Kozuma Y, Toyokawa G, Yamazaki K, Takeo S. EP1.03-25 Impact of Preoperative Complete Blood Cell Count-Derived Inflammation Biomarkers in Early-Staged Non-Small Cell Lung Cancer Patients. J Thorac Oncol 2019. [DOI: 10.1016/j.jtho.2019.08.2106] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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Akamine T, Toyokawa G, Tagawa T, Yamazaki K, Seto T, Takeo S, Mori M. Lorlatinib for the treatment of patients with non-small cell lung cancer. Drugs Today (Barc) 2019; 55:107-116. [PMID: 30816885 DOI: 10.1358/dot.2019.55.2.2927983] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
Abstract
Lorlatinib is a novel third-generation tyrosine kinase inhibitor (TKI) which targets anaplastic lymphoma kinase (ALK) as well as receptor tyrosine kinase c-ros oncogene 1 (ROS1). A critical limitation of conventional ALK/ROS TKIs is their association with acquired resistance mutations (particularly ALK G1202R and ROS1 G2032R) in the ALK or ROS1 gene, although these are not the only resistance mechanisms. Another limitation of this class of drugs is their inadequate efficacy against central nervous system metastasis, likely attributable to the blood-brain barrier (BBB). Therefore, lorlatinib was developed to overcome these limitations by being more potent, selective and permeable to the BBB than previous-generation ALK/ROS1 TKIs and subsequently received breakthrough therapy designation from the U.S. Food and Drug Administration (FDA) in April 2017. In September 2018, Japan became the first country where lorlatinib received approval for treating patients with ALK-rearranged non-small cell lung cancer. Eventually, the FDA approved lorlatinib (Lorbrena; Pfizer) in November 2018. Lorlatinib use is expected to increase in importance, owing to its promising efficacy in clinical trials.
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Affiliation(s)
- T Akamine
- Department of Surgery and Science, Graduate School of Medical Sciences, Kyushu University, Fukuoka, Japan
| | - G Toyokawa
- Department of Thoracic Surgery, National Hospital Organization, Kyushu Medical Center, Fukuoka, Japan.
| | - T Tagawa
- Department of Surgery and Science, Graduate School of Medical Sciences, Kyushu University, Fukuoka, Japan
| | - K Yamazaki
- Department of Thoracic Surgery, National Hospital Organization, Kyushu Medical Center, Fukuoka, Japan
| | - T Seto
- Department of Thoracic Oncology, National Kyushu Cancer Center, Fukuoka, Japan
| | - S Takeo
- Department of Thoracic Surgery, National Hospital Organization, Kyushu Medical Center, Fukuoka, Japan
| | - M Mori
- Department of Surgery and Science, Graduate School of Medical Sciences, Kyushu University, Fukuoka, Japan
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Takenaka T, Yamazaki K, Takeo S. P1.16-56 Prognostic Ability of New T1 Descriptors in the TNM Classification of Surgically Treated Non-Small Cell Lung Cancer. J Thorac Oncol 2018. [DOI: 10.1016/j.jtho.2018.08.1025] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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Yamada Y, Toyokawa G, Tagawa T, Kamitani T, Yamasaki Y, Shoji F, Yamazaki K, Takeo S, Oda Y. Computed tomography features of resected lung adenocarcinomas with spread through air spaces. Ann Oncol 2018. [DOI: 10.1093/annonc/mdy301.008] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
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Toyokawa G, Takada K, Hamamoto R, Yamada Y, Tagawa T, Shoji F, Yamazaki K, Oda Y, Takeo S. A positive correlation between the EZH2 and PD-L1 expression in patients with resected lung adenocarcinoma. Ann Oncol 2018. [DOI: 10.1093/annonc/mdy290.008] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
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Takenaka T, Yamazaki K, Miura N, Takeo S. Prognostic impact of new T1 descriptors in TNM classification of non-small cell lung cancer. Ann Oncol 2017. [DOI: 10.1093/annonc/mdx669.004] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
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11
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Shoji F, Miura N, Akamine T, Matsubara T, Kozuma Y, Haratake N, Takamori S, Katsura M, Takada K, Toyokawa G, Takenaka T, Yamazaki K, Okamoto T, Takeo S, Maehara Y. P3.16-003 The Clinical Significance of Immune-Nutritional Parameters in Surgically Resected Elderly Patients with Non-Small Cell Lung Cancer. J Thorac Oncol 2017. [DOI: 10.1016/j.jtho.2017.09.1809] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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Okamoto T, Yano T, Shimokawa M, Takeo S, Yamazaki K, Sugio K, Takenoyama M, Nagashima A, Tagawa T, Emi Y, Maehara Y. A phase II randomized trial of adjuvant chemotherapy for the patients completely resected pathological stage IB (T > 5cm), II, IIIA non-small cell lung cancer comparing S-1 versus S-1 with cisplatin. Ann Oncol 2017. [DOI: 10.1093/annonc/mdx381.003] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
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13
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Nakamura M, Nishikawa J, Hashimoto S, Takeo S, Miura O, Sakaida I. Gastrointesintal: rare congenital abnormality of the duodenum: intraluminal duodenal diverticulum. J Gastroenterol Hepatol 2014; 29:893. [PMID: 24750199 DOI: 10.1111/jgh.12258] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/09/2022]
Affiliation(s)
- M Nakamura
- Department of Gastroenterology and Hepatology, Yamaguchi University Graduate School of Medicine, Ube
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Tanaka H, Takeo S, Monji Y, Kuwayama T, Iwata H. Maternal liver damage delays meiotic resumption in bovine oocytes through impairment of signalling cascades originated from low p38MAPK activity in cumulus cells. Reprod Domest Anim 2013; 49:101-8. [PMID: 24102925 DOI: 10.1111/rda.12235] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/09/2013] [Accepted: 08/14/2013] [Indexed: 11/28/2022]
Abstract
The main objective of the present study is to investigate the molecular mechanism underlying the delay in progression of nuclear maturation in oocytes derived from cows with damaged livers (DL cows), which was previously reported. In present study, delayed progression of nuclear maturation of oocytes derived from DL cows relative to oocytes derived from cows with healthy livers (HL cows) was accompanied by low maturation promoting factor (MPF) activity (0.43 fold, p < 0.05). When cumulus cells were removed from cumulus-oocyte complexes and the denuded oocytes were cultured, there was no difference in the progression of nuclear maturation between the two liver conditions. In addition, gap junctional communication (GJC) between the oocyte and cumulus cells was higher in DL cows than in HL cows at 3 and 7 h of in vitro maturation (IVM) (p < 0.05). Supplementation of IVM medium with epidermal growth factor (EGF) increased the ratio of germinal vesicle breakdown (GVBD) of oocytes derived from DL cows to the level seen in oocytes derived from HL cows. Additionally, the level of p38MAPK phosphorylation at 0 h of IVM was significantly lower in cumulus cells derived from DL cows than in cumulus cells derived from HL cows (HL cows, 53.5%; DL cows, 28.9%; p < 0.05). Thus, a low level of p38MAPK phosphorylation in cumulus cells induced slow GJC closure between oocyte and cumulus cells, which resulted in slow meiotic maturation of oocytes derived from DL cows.
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Affiliation(s)
- H Tanaka
- Department of Animal Science, Tokyo University of Agriculture, Atsugi, Japan
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Takeo S, Kawahara-Miki R, Goto H, Cao F, Kimura K, Monji Y, Kuwayama T, Iwata H. Age-associated changes in gene expression and developmental competence of bovine oocytes, and a possible countermeasure against age-associated events. Mol Reprod Dev 2013; 80:508-21. [PMID: 23712640 DOI: 10.1002/mrd.22187] [Citation(s) in RCA: 51] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/12/2012] [Accepted: 04/25/2013] [Indexed: 12/11/2022]
Abstract
In general, maternal age affects the quality of oocytes and embryos. The present study aimed to examine the features and age-associated gene expression profiles of bovine oocytes and embryos as well as to discover possible countermeasures against age-associated events. Comprehensive gene expression assays of germinal vesicle and metaphase II (MII)-stage oocytes and 8- to 16-cell-stage embryos were conducted using next-generation sequencing technology. The gene expression profiles of aged cows showed high expression of genes related to oxidative phosphorylation, eIF4 and p70S6K signaling, and mitochondrial dysfunction in MII-stage oocytes. Oocytes derived from aged cows, compared with those derived from their younger counterparts, exhibited high levels of abnormal fertilization and blastocysts with low total cell numbers. Levels of reactive oxygen species (ROS) and SIRT1 were higher in in vitro-matured oocytes derived from aged cows than in those derived from their younger counterparts. Supplementation of maturation medium with N-acetyl-cysteine (NAC), but not resveratrol, reduced the levels of ROS in the oocytes derived from cows of both age groups; however, resveratrol, but not NAC, improved the fertilization ratio. Conversely, EX 527, an inhibitor of SIRT1, increased the ratio of abnormal fertilization. In conclusion, gene expression profiles of oocytes and embryos derived from aged cows differ from those of oocytes and embryos derived from young cows; in particular, oocytes derived from aged cows show protein and mitochondrial dysfunction. In addition, activation of SIRT1 in oocytes may be a potential countermeasure against age-associated events in oocytes derived from aged cows.
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Affiliation(s)
- S Takeo
- Department of Animal Science, Tokyo University of Agriculture, Atsugi, Japan
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Oikawa R, Hosoda C, Nasa Y, Daicho T, Tanoue A, Tsujimoto G, Takagi N, Tanonaka K, Takeo S. Decreased susceptibility to salt-induced hypertension in subtotally nephrectomized mice lacking the vasopressin V1a receptor. Cardiovasc Res 2010; 87:187-94. [DOI: 10.1093/cvr/cvq034] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
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Maemondo M, Masuda N, Sekine I, Kubota K, Segawa Y, Shibuya M, Imamura F, Katakami N, Hida T, Takeo S. A phase II study of palonosetron combined with dexamethasone to prevent nausea and vomiting induced by highly emetogenic chemotherapy. Ann Oncol 2009; 20:1860-6. [PMID: 19561037 DOI: 10.1093/annonc/mdp195] [Citation(s) in RCA: 44] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
BACKGROUND This is a randomized, double-blind, dose-ranging study in patients receiving highly emetogenic chemotherapy (HEC) to evaluate the safety, efficacy, and pharmacokinetics of palonosetron, in combination with dexamethasone. MATERIALS AND METHODS We randomized 233 patients to receive palonosetron as a single i.v. bolus dose of 0.075, 0.25, or 0.75 mg before administration of HEC. Dexamethasone (12-16 mg i.v. on day 1, 8 mg i.v. on day 2, and 4-8 mg i.v. on day 3) was administered for prophylactic antiemesis. Pharmacokinetics of palonosetron was analyzed in 24 patients. RESULTS In this study, all patients were given > or =50 mg/m(2) cisplatin, which was considered to be HEC. No significant differences in complete response (CR: no emesis and no rescue medication) rates were found in the first 24 h between the 0.075-, 0.25-, and 0.75-mg groups (77.6%, 81.8%, and 79.5%, respectively). In the 120-h period of overall observation, CR rates increased in a dose-dependent manner. In the 0.75-mg group, we observed a significantly longer time to treatment failure than in the 0.075-mg group (median time >120 versus 82.0 h, P = 0.038). Palonosetron was tolerated well and did not show any dose-related increase in adverse effects. CONCLUSIONS Palonosetron at doses of 0.25 and 0.75 mg was shown to be effective in preventing chemotherapy-induced nausea and vomiting with high CR rates of patients treated with HEC in Japan. All tested doses of palonosetron were tolerated well.
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Affiliation(s)
- M Maemondo
- Department of Respiratory Medicine, Tohoku University Hospital, Sendai, Japan.
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Yamaguchi M, Takeo S, Suemitsu R. Feasibility of adjuvant cisplatin and gemcitabine in patients who have undergone complete resection of stage IB-IIIA non-small cell lung cancer (NSCLC): Preliminary report of a feasibility trial in Japanese patients. J Clin Oncol 2008. [DOI: 10.1200/jco.2008.26.15_suppl.18503] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
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Motegi K, Tanonaka K, Takenaga Y, Takagi N, Takeo S. Preservation of mitochondrial function may contribute to cardioprotective effects of Na+/Ca2+ exchanger inhibitors in ischaemic/reperfused rat hearts. Br J Pharmacol 2007; 151:963-78. [PMID: 17549042 PMCID: PMC2042925 DOI: 10.1038/sj.bjp.0707321] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/28/2007] [Revised: 04/03/2007] [Accepted: 04/18/2007] [Indexed: 01/24/2023] Open
Abstract
BACKGROUND AND PURPOSE Na+/Ca2+ exchanger (NCX) inhibitors are known to attenuate myocardial reperfusion injury. However, the exact mechanisms for the cardioprotection remain unclear. The present study was undertaken to examine the mechanism underlying the cardioprotection by NCX inhibitors against ischaemia/reperfusion injury. EXPERIMENTAL APPROACH Isolated rat hearts were subjected to 35-min ischaemia/60-min reperfusion or 20-min ischaemia/60-min reperfusion. NCX inhibitors (3-30 microM KB-R7943 (KBR) or 0.3-1 microM SEA0400 (SEA)) were given for 5 min prior to ischaemia (pre-ischaemic treatment) or for 10 min after the onset of reperfusion (post-ischaemic treatment). KEY RESULTS With 35-min ischaemia/60-min reperfusion, pre- or post-ischaemic treatment with KBR or SEA neither enhanced post-ischaemic contractile recovery nor attenuated ischaemia- or reperfusion-induced Na+ accumulation and damage to mitochondrial respiratory function. With the milder model (20-min ischaemia/reperfusion), pre- or post-ischaemic treatment with 10 microM KBR or 1 microM SEA significantly enhanced the post-ischaemic contractile recovery, associated with reductions in reperfusion-induced Ca2+ accumulation, damage to mitochondrial function, and decrease in myocardial high-energy phosphates. Furthermore, Na+ influx to mitochondria in vitro was enhanced by increased concentrations of NaCl. KBR (10 microM) and 1 microM SEA partially decreased the Na+ influx. CONCLUSIONS AND IMPLICATIONS The NCX inhibitors exerted cardioprotective effects during relatively mild ischaemia. The mechanism may be attributable to prevention of mitochondrial damage, possibly mediated by attenuation of Na+ overload in cardiac mitochondria during ischaemia and/or Ca2+ overload via the reverse mode of NCX during reperfusion.
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Affiliation(s)
- K Motegi
- Department of Molecular and Cellular Pharmacology, Tokyo University of Pharmacy and Life Sciences Hachioji, Japan
| | - K Tanonaka
- Department of Molecular and Cellular Pharmacology, Tokyo University of Pharmacy and Life Sciences Hachioji, Japan
| | - Y Takenaga
- Department of Molecular and Cellular Pharmacology, Tokyo University of Pharmacy and Life Sciences Hachioji, Japan
| | - N Takagi
- Department of Molecular and Cellular Pharmacology, Tokyo University of Pharmacy and Life Sciences Hachioji, Japan
| | - S Takeo
- Department of Molecular and Cellular Pharmacology, Tokyo University of Pharmacy and Life Sciences Hachioji, Japan
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Yoshino I, Ichinose Y, Nagashima A, Takeo S, Motohiro A, Yano T, Ishida T, Yamazaki K, Sugio K, Yasumoto K, Maehara Y. Clinical characterization of node-negative non-small cell lung cancer: Results of a prospective investigation. J Clin Oncol 2006. [DOI: 10.1200/jco.2006.24.18_suppl.7218] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
7218 Background: 20 to 30% of clinical stage IA non-small cell lung cancer cases were revealed to be node-positive by pathologic examination of resected specimens. In this prospective study, the clinical features of a truly node-negative population were prospectively investigated to search for candidates of a lesser resection or of a stereotactic radiotherapy. Methods: The clinical data and radiographic features of high-resolution computed tomography (HR-CT) were registered before operation in 169 clinical stage IA lung cancer patients, who were scheduled to undergo a standard lobectomy and systemic mediastinal node dissection. The nodal metastasis was pathologically defined, while the clinical factors associated with the presence of the nodal metastasis were evaluated. Results: In 130 evaluable cases, 16 of 114 adenocarcinoma and 3 of 16 other NSCLC were node-positive. Among all parameters, positivity of the serum carcinoembryonic antigen (CEA) was the only factor significantly associated with nodal metastasis (p = 0.0074). When we focused on adenocarcinomas, the serum CEA, retraction sign and intratumoral air-space on HR-CT were suggested to be predictive factors for lymph node metastasis with hazard ratios of 12.44 (p = 0.0003), 6.53 (p = 0.0533) and 0.17 (0.0073), respectively. In combination with the radiologic features of HR-CT imaging, none of 18 CEA-negative/retraction-negative cases and 3 of 65 CEA-negative/air-space positive cases showed nodal metastasis, in which the incidence of nodal metastasis was significantly lower than the counterparts with respective p-values of 0.0015 and 0.037. The tumor size and the proportion of ground glass attenuation were not associated with the incidence of nodal metastasis. Conclusions: The serum CEA and HR-CT features thus allowed us to identify node-negative lung adenocarcinomas. In clinical stage IA adenocarcinoma cases, a standard operation should be considered when positive serum CEA and/or retraction sign on HRCT is noticed. No significant financial relationships to disclose.
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Affiliation(s)
- I. Yoshino
- Kyushu University Graduate School of Medical Sciences, Fukuoka, Japan; Kyushu Lung Cancer Surgery Cooperative Group, Fukuoka, Japan
| | - Y. Ichinose
- Kyushu University Graduate School of Medical Sciences, Fukuoka, Japan; Kyushu Lung Cancer Surgery Cooperative Group, Fukuoka, Japan
| | - A. Nagashima
- Kyushu University Graduate School of Medical Sciences, Fukuoka, Japan; Kyushu Lung Cancer Surgery Cooperative Group, Fukuoka, Japan
| | - S. Takeo
- Kyushu University Graduate School of Medical Sciences, Fukuoka, Japan; Kyushu Lung Cancer Surgery Cooperative Group, Fukuoka, Japan
| | - A. Motohiro
- Kyushu University Graduate School of Medical Sciences, Fukuoka, Japan; Kyushu Lung Cancer Surgery Cooperative Group, Fukuoka, Japan
| | - T. Yano
- Kyushu University Graduate School of Medical Sciences, Fukuoka, Japan; Kyushu Lung Cancer Surgery Cooperative Group, Fukuoka, Japan
| | - T. Ishida
- Kyushu University Graduate School of Medical Sciences, Fukuoka, Japan; Kyushu Lung Cancer Surgery Cooperative Group, Fukuoka, Japan
| | - K. Yamazaki
- Kyushu University Graduate School of Medical Sciences, Fukuoka, Japan; Kyushu Lung Cancer Surgery Cooperative Group, Fukuoka, Japan
| | - K. Sugio
- Kyushu University Graduate School of Medical Sciences, Fukuoka, Japan; Kyushu Lung Cancer Surgery Cooperative Group, Fukuoka, Japan
| | - K. Yasumoto
- Kyushu University Graduate School of Medical Sciences, Fukuoka, Japan; Kyushu Lung Cancer Surgery Cooperative Group, Fukuoka, Japan
| | - Y. Maehara
- Kyushu University Graduate School of Medical Sciences, Fukuoka, Japan; Kyushu Lung Cancer Surgery Cooperative Group, Fukuoka, Japan
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Kawai T, Takagi N, Mochizuki N, Besshoh S, Sakanishi K, Nakahara M, Takeo S. Inhibitor of vascular endothelial growth factor receptor tyrosine kinase attenuates cellular proliferation and differentiation to mature neurons in the hippocampal dentate gyrus after transient forebrain ischemia in the adult rat. Neuroscience 2006; 141:1209-16. [PMID: 16753262 DOI: 10.1016/j.neuroscience.2006.04.064] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/11/2005] [Revised: 04/25/2006] [Accepted: 04/26/2006] [Indexed: 01/17/2023]
Abstract
Neurogenesis in the adult hippocampal dentate gyrus is promoted by transient forebrain ischemia. The mechanism responsible for this ischemia-induced neurogenesis, however, remains to be determined. It has been suggested that there may be a close relationship between neurogenesis and the expression of vascular endothelial growth factor, an angiogenic factor. The purpose of the present study was to examine the relationship between vascular endothelial growth factor and cell proliferation in the dentate gyrus after transient forebrain ischemia. The mRNA expression of vascular endothelial growth factor was increased in the dentate gyrus on day 1 after ischemia. Immunohistochemical analysis on day 9 after ischemia, when a significant increase in cell proliferation was seen, showed that the cerebral vessel space in the subgranular zone of the dentate gyrus had not been affected by the ischemia. Neither were the vascular densities on days 1 and 3 after ischemia altered compared with those of non-operated naïve control rats. Furthermore, the distance from the center of the proliferative cells to the nearest cerebral vessel of ischemic rats was comparable to that of the sham-operated rats. We demonstrated that transient forebrain ischemia-induced cell proliferation and differentiation to mature neurons in the hippocampal dentate gyrus was attenuated by the i.c.v. administration of a vascular endothelial growth factor receptor tyrosine kinase inhibitor. These results suggest that vascular endothelial growth factor receptor at the early period of reperfusion may contribute to neurogenesis rather than to angiogenesis in the hippocampal dentate gyrus.
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Affiliation(s)
- T Kawai
- Department of Molecular and Cellular Pharmacology, Tokyo University of Pharmacy & Life Science, 1432-1 Horinouchi, Hachioji, Tokyo 192-0392, Japan
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Takeo S, Fukuyama S. P-927 Prospective randomized study on washing the intrathoracicspace using distilled water or saline before closing the chest in operation for lung cancer. Lung Cancer 2005. [DOI: 10.1016/s0169-5002(05)81420-5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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Bosompem KM, Bentum IA, Otchere J, Anyan WK, Brown CA, Osada Y, Takeo S, Kojima S, Ohta N. Infant schistosomiasis in Ghana: a survey in an irrigation community. Trop Med Int Health 2004; 9:917-22. [PMID: 15303998 DOI: 10.1111/j.1365-3156.2004.01282.x] [Citation(s) in RCA: 66] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
We used a rapid, visually read, field applicable monoclonal antibody (MoAb)-dipstick assay for specific diagnosis of urinary schistosomiasis together with microscopy to determine the prevalence of infant schistosomiasis in a community in the Awutu-Efutu Senya District in the Central Region of Ghana. The study group consisted of 97 infants (51 males and 46 females) aged 2 months to 5 years. A total of 75 of 97 (77.3%) subjects submitted stool samples; none had Schistosoma mansoni. Three individuals (3.1%) had hookworms but there were no other intestinal helminths. The urinary schistosomiasis prevalence by MoAb-dipstick (30%) was higher (P < 0.05) than that estimated by microscopy (11.2%). However, three of nine (33.3%) microscopically confirmed cases tested MoAb-dipstick positive after pre-treatment of the urine specimen with heat. The youngest infant to be found infected with S. haematobium microscopically was 4 months old. Fifteen of 71 S. haematobium egg negative individuals tested dipstick positive, giving a dipstick specificity of 78.9% as compared with microscopy as gold standard test. The relative sensitivity of the dipstick was 100%.
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Affiliation(s)
- K M Bosompem
- Parasitology Unit, Noguchi Memorial Institute for Medical Research, Legon, Ghana
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Nakanishi Y, Kawasaki M, Yamasaki H, Ninomiya K, Takeo S, Hayashi S, Oishi K, Kuba M, Takayama K, Hara N. Concurrent paclitaxel, carboplatin and radiation therapy for locally advanced non-small cell lung cancer. J Clin Oncol 2004. [DOI: 10.1200/jco.2004.22.90140.7336] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Affiliation(s)
- Y. Nakanishi
- Kyushu University, Fukuoka, Japan; Kyushu Thoracic Oncology Group, Fukuoka, Japan
| | - M. Kawasaki
- Kyushu University, Fukuoka, Japan; Kyushu Thoracic Oncology Group, Fukuoka, Japan
| | - H. Yamasaki
- Kyushu University, Fukuoka, Japan; Kyushu Thoracic Oncology Group, Fukuoka, Japan
| | - K. Ninomiya
- Kyushu University, Fukuoka, Japan; Kyushu Thoracic Oncology Group, Fukuoka, Japan
| | - S. Takeo
- Kyushu University, Fukuoka, Japan; Kyushu Thoracic Oncology Group, Fukuoka, Japan
| | - S. Hayashi
- Kyushu University, Fukuoka, Japan; Kyushu Thoracic Oncology Group, Fukuoka, Japan
| | - K. Oishi
- Kyushu University, Fukuoka, Japan; Kyushu Thoracic Oncology Group, Fukuoka, Japan
| | - M. Kuba
- Kyushu University, Fukuoka, Japan; Kyushu Thoracic Oncology Group, Fukuoka, Japan
| | - K. Takayama
- Kyushu University, Fukuoka, Japan; Kyushu Thoracic Oncology Group, Fukuoka, Japan
| | - N. Hara
- Kyushu University, Fukuoka, Japan; Kyushu Thoracic Oncology Group, Fukuoka, Japan
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Yoshida T, Adachi K, Tanioka Y, Sasaki T, Ono S, Hanada H, Esaki T, Yagawa T, Takeo S, Saiki Y, Harada T, Okita K. Dieulafoy's lesion of the esophagus correctly diagnosed and successfully treated by the endoscopic injection of N-butyl-2-cyanoacrylate. Endoscopy 2004; 36:183-5. [PMID: 14765318 DOI: 10.1055/s-2004-814188] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/10/2022]
Abstract
Dieulafoy's lesion is an arterial malformation in the subumucosal layer of the gastrointestinal tract that can cause massive bleeding. The esophagus is not a common location for this lesion. We present here a first report of Dieulafoy's lesion of the esophagus correctly diagnosed and successfully treated by the endoscopic injection of N-butyl-2-cyanoacrylate.
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Affiliation(s)
- T Yoshida
- Department of Gastroenterology and Hepatology, Yamaguchi University School of Medicine, Yamaguchi, Japan.
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Tanioka Y, Yoshida T, Yagawa T, Saiki Y, Takeo S, Harada T, Okazawa T, Yanai H, Okita K. Matrix metalloproteinase-7 and matrix metalloproteinase-9 are associated with unfavourable prognosis in superficial oesophageal cancer. Br J Cancer 2004; 89:2116-21. [PMID: 14647147 PMCID: PMC2376843 DOI: 10.1038/sj.bjc.6601372] [Citation(s) in RCA: 70] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023] Open
Abstract
If oesophageal carcinoma is detected in the superficial stage, the prognosis is better than for advanced oesophageal carcinoma. But the factors which predict the prognosis and treatment policy remain unclear. Matrix metalloproteinase-7 (MMP-7) and matrix metalloproteinase-9 (MMP-9) have been reported to have close associations with tumour invasion and metastasis. In this study, we retrospectively studied the relations between MMP-7 and MMP-9 expression in immunohistochemistry, clinicopathologic factors, and prognosis in 55 superficial oesophageal carcinomas. MMP-7 and MMP-9 expression occurred in 23.6% and 47.3% of the patients, respectively. MMP-7 expression was significantly correlated with the presence of nodal metastasis (P=0.004). MMP-9 expression was significantly correlated with the depth of tumour invasion (P=0.004), lymphatic permeation (P=0.001), nodal metastasis (P=0.049), and pathologic differentiation grade (P=0.003). By the log-rank test, MMP-7 expression and MMP-9 expression on the invasive front were related to the prognosis. In multivariate analysis, MMP-9 expression on the invasive front was an independent prognostic indicator. The combined expression of MMP-7 and MMP-9 may be a good marker for the degree of malignancy of oesophageal cancer and for the presence of lymphatic metastasis.
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Affiliation(s)
- Y Tanioka
- Department of Gastroenterology and Hepatology, Yamaguchi University School of Medicine, Yamaguchi, Japan
| | - T Yoshida
- Department of Gastroenterology and Hepatology, Yamaguchi University School of Medicine, Yamaguchi, Japan
- Department of Gastroenterology and Hepatology, Yamaguchi University School of Medicine, 1-1-1 Minami-Kogushi, Ube, Yamaguchi 755-8505 Japan. E-mail:
| | - T Yagawa
- Department of Gastroenterology and Hepatology, Yamaguchi University School of Medicine, Yamaguchi, Japan
| | - Y Saiki
- Department of Gastroenterology and Hepatology, Yamaguchi University School of Medicine, Yamaguchi, Japan
| | - S Takeo
- Department of Gastroenterology and Hepatology, Yamaguchi University School of Medicine, Yamaguchi, Japan
| | - T Harada
- Department of Gastroenterology and Hepatology, Yamaguchi University School of Medicine, Yamaguchi, Japan
| | - T Okazawa
- Department of Gastroenterology and Hepatology, Yamaguchi University School of Medicine, Yamaguchi, Japan
| | - H Yanai
- Department of Gastroenterology and Hepatology, Yamaguchi University School of Medicine, Yamaguchi, Japan
| | - K Okita
- Department of Gastroenterology and Hepatology, Yamaguchi University School of Medicine, Yamaguchi, Japan
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Nagakura A, Takagi N, Takeo S. Impairment of cerebral cAMP-mediated signal transduction system and of spatial memory function after microsphere embolism in rats. Neuroscience 2002; 113:519-28. [PMID: 12150772 DOI: 10.1016/s0306-4522(02)00207-5] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
Abstract
The transcription factor cAMP-responsive element binding protein (CREB) has been implicated in synaptic plasticity and memory. The purpose of the present study was to characterize alterations in the cAMP/protein kinase A (PKA)/CREB system after sustained cerebral ischemia. Sustained cerebral ischemia was induced by injection of 900 microspheres (48 microm in diameter) into the right (ipsilateral) hemisphere of rats. Alterations in the CREB, PKA, and cAMP levels in the cerebral cortex and hippocampus were examined up to 7 days after microsphere embolism. Immunoblotting analysis showed a decrease in the immunoreactivity of phosphorylated CREB (pCREB) in the ipsilateral hemisphere on the third day after microsphere embolism, whereas that of the total CREB was not altered. An electrophoretic gel mobility shift assay showed a decrease in the cAMP response element (CRE)-DNA binding activity of CREB in the ischemic region on the third day after the microsphere embolism. Cytosolic PKA C beta in the ipsilateral hemisphere was selectively decreased on the first day after the microsphere embolism, whereas the levels of another catalytic subunit, C alpha, and a regulatory subunit, RII alpha, were not altered. Immunoreactivity of the PKA catalytic subunit C alpha in the nucleus of the ipsilateral hemisphere was decreased on the third day after the embolism. The decreases in the pCREB, CRE-DNA binding activity, and PKA C alpha and C beta levels lasted at least up to 7 days after the operation. A decrease in the cAMP content was also seen in the ipsilateral hemisphere throughout the experiment. Furthermore, microsphere embolized rats showed prolongation of the escape latency in the water maze task determined on the seventh to ninth day after the operation. Our results suggest that sustained cerebral ischemia may impair the phosphorylation and CRE-DNA binding activity of CREB and that these effects may be one of the possible causes for learning and memory dysfunction.
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Affiliation(s)
- A Nagakura
- Department of Pharmacology, Tokyo University of Pharmacy and Life Science, 1432-1, Horinouchi, Hachioji, Tokyo 192-0392, Japan
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Kawada T, Nakazawa M, Takeo S, Toyo-oka T. S5-7 Assessment of novel paradigm for the development of advanced heart failure. J Mol Cell Cardiol 2002. [DOI: 10.1016/s0022-2828(02)90284-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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Abstract
BACKGROUND This is the first study on the quantitative assessment of thymidine phosphorylase (TP) activity in patients with nonsmall lung carcinoma. TP is identical to the platelet-derived endothelial cell growth factor with its angiogenic activity. Thus, it is believed that TP activity in tumor tissues plays an important role in disease progression. METHODS Using a sandwich enzyme immunoassay, the TP activity in lung carcinoma tissues was measured quantitatively in 39 patients with primary lung carcinoma who underwent pulmonary lobectomy between July 1999 and May 2000. RESULTS The mean value of TP activity in tumor tissues was significantly higher than the level in normal lung tissues (226 U/mg protein vs. 46 U/mg protein, respectively; P < 0.0001). TP activity in normal lung tissues was high in male patients (male vs. female, respectively: 56.1 U/mg protein vs. 29.3 U/mg protein; P = 0.001) and in heavy smokers (Brinkmann index [BI] > or = 600 [57.9 U/mg protein] vs. BI < 600 [31.7 U/mg protein]; P = 0.001). Conversely, the TP activity in tumor tissues was correlated with neither gender nor smoking status. Although there was no difference in the TP activity among histologic types, well-differentiated tumors exhibited a significantly lower level of TP activity compared with the activity in both moderately and poorly differentiated tumors. However, the TP activity in tumor tissues was not correlated with disease progression. CONCLUSIONS High TP activity in tumor tissues from patients with primary lung carcinoma did not reflect the malignant potential of the disease.
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Affiliation(s)
- T Yano
- Department of Thoracic Surgery, Nakatsu Municipal Hospital, Nakatsu, Oita, Japan
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Takashima E, Takamiya S, Takeo S, Mi-ichi F, Amino H, Kita K. Isolation of mitochondria from Plasmodium falciparum showing dihydroorotate dependent respiration. Parasitol Int 2001; 50:273-8. [PMID: 11719114 DOI: 10.1016/s1383-5769(01)00085-x] [Citation(s) in RCA: 39] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
Abstract
Using N2 cavitation, we established a protocol to prepare the active mitochondria from Plasmodium falciparum showing a higher succinate dehydrogenase activity than previously reported and a dihydroorotate-dependent respiration. The fact that fumarate partially inhibited the dihydroorotate dependent respiration suggests that complex II (succinate-ubiquinone reductase/quinol-fumarate reductase) in the erythrocytic stage cells of P. falciparum functions as a quinol-fumarate reductase.
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Affiliation(s)
- E Takashima
- Department of Biomedical Chemistry, Graduate School of Medicine, The University of Tokyo, Hongo 7-3-1, Bunkyo-ku, 113-0033, Tokyo, Japan
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Takeo S, Arai H, Kusano N, Harada T, Furuya T, Kawauchi S, Oga A, Hirano T, Yoshida T, Okita K, Sasaki K. Examination of oncogene amplification by genomic DNA microarray in hepatocellular carcinomas: comparison with comparative genomic hybridization analysis. Cancer Genet Cytogenet 2001; 130:127-32. [PMID: 11675133 DOI: 10.1016/s0165-4608(01)00479-4] [Citation(s) in RCA: 61] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Abstract
To identify amplified oncogenes involved in hepatocellular carcinomas (HCC), we applied a genomic DNA microarray spotted with 57 oncogenes to 20 HCCs. Aberrations in DNA copy number also were analyzed by comparative genomic hybridization (CGH) using an aliquot of DNA samples. In 5 of 20 HCCs, only 6 oncogenes (CCND1, FGF3/FGF4, SAS/CDK4, TERC, MET, and MYC) were amplified, whereas in the remaining 15 tumors no oncogenes were amplified. A comparison of DNA microarray and conventional CGH analyses showed that, although 5 of 6 amplified oncogenes shown by microarray were located in chromosomal regions shown by CGH to have increased DNA copy numbers, not all genes located in such chromosomal regions were affected. One of the amplified oncogenes (SAS/CDK4) was found in a chromosomal region that was undetected by CGH. We, therefore, conclude that amplification of the oncogenes examined in this series is not directly implicated in hepatocellular carcinogenesis.
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Affiliation(s)
- S Takeo
- Department of Pathology, Yamaguchi University School of Medicine, Ube 755-8505, Japan.
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Maki T, Nasa Y, Yamaguchi F, Yoshida H, Mori M, Takada T, Horikawa E, Okano K, Takeo S. Long-term treatment with neutral endopeptidase inhibitor improves cardiac function and reduces natriuretic peptides in rats with chronic heart failure. Cardiovasc Res 2001; 51:608-17. [PMID: 11476752 DOI: 10.1016/s0008-6363(01)00258-9] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
OBJECTIVE Increased secretion of atrial and brain natriuretic peptide (ANP and BNP) from hearts is known to exhibit favorable effects in patients and animals with heart failure, and inhibition of neutral endopeptidase (NEP), an enzyme that degrades ANP and BNP, may further increase these peptide levels. However, it is still unknown whether such elevation of the ANP and BNP may offer a therapeutic benefit to the progression of chronic heart failure (CHF). We examined the effects of ONO-9902, a novel NEP inhibitor, on changes in hemodynamic parameters, NEP activity and neurohumoral factors in rats with CHF induced by left coronary artery ligation (CAL). METHODS Male Wistar rats (220-240 g) were subjected to induction of acute myocardial infarction by CAL. Rats were orally treated with ONO-9902 (300 mg/kg/day) from the 1st to 6th week after the operation. Hemodynamic and/or biochemical assessments were performed at the 1st and 6th weeks after the operation. RESULTS A single administration of ONO-9902 inhibited the plasma and kidney NEP activities and thereby further augmented the elevation of plasma ANP concentration in rats with CAL at the 1st week after the operation. In rats with CAL at the 6th week after the operation, the left ventricular end-diastolic pressure (LVEDP) increased and cardiac output index (COI) decreased as compared with those of sham-operated rats. These changes were accompanied by marked increases in the plasma ANP, BNP and endothelin-1 (ET-1). Chronic treatment with ONO-9902 attenuated the increase in LVEDP and the decrease in COI. These changes were associated with a decrease in plasma ANP, BNP and ET-1 concentrations. CONCLUSIONS The results suggest that chronic treatment with NEP inhibitor improves depressed cardiac function in rats with CHF. ONO-9902 may offer a new and possible therapeutic approach in patients with CHF.
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Affiliation(s)
- T Maki
- Department of Pharmacology, Tokyo University of Pharmacy and Life Science, 1432-1 Horinouchi, Hachioji, 192-0392, Tokyo, Japan
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Kajihara H, Tsutsumi E, Kinoshita A, Nakano J, Takagi K, Takeo S. Activated astrocytes with glycogen accumulation in ischemic penumbra during the early stage of brain infarction: immunohistochemical and electron microscopic studies. Brain Res 2001; 909:92-101. [PMID: 11478925 DOI: 10.1016/s0006-8993(01)02640-3] [Citation(s) in RCA: 60] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
Brain infarction was induced in rats by injection of microspheres through the right internal carotid artery, and structural changes in the astrocytes were observed during the early period following the infarction. Necrotic foci, varying in size and shape, were found in the right hemisphere. After immunohistochemical staining for GFAP, GFAP-positive astrocytes in the perinecrotic area known as the ischemic penumbra had distinctly increased in number and size with elongation of cytoplasmic processes 3 days after infarction. Electron microscopic observation revealed that glycogen granules had markedly accumulated in the cytoplasm of astrocytes located in the ischemic penumbra 3 and 5 days after infarction. Seven days after infarction, however, the glycogen granules disappeared from the astrocytes. Intermediate filaments increasingly appeared in the protoplasmic astrocytes after 3 days and were abundant in the activated and hypertrophied astrocytes after 7 days. As a result of our present study, we conclude that: (1) the function of glucose uptake from blood vessels was not impaired in the astrocytes under hypoxic conditions; (2) the astrocytes actively ingested blood glucose through the endothelial cells and accumulated it as glycogen for activation of their functions, and the cell volume increased under hypoxic conditions; (3) the depression of energy metabolism and the decrease in the uptake of energy sources in the nerve cells promoted glycogen accumulation in the astrocytes under hypoxic conditions; (4) intermediate filaments (GFAP filaments) increased in number, coincident with the activation and enlargement of the astrocytes; and (5) protoplasmic astrocytes were transformed into fibrous astrocytes in the ischemic penumbra of the brain infarction.
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Affiliation(s)
- H Kajihara
- Department of Pathology, Institute of Health Sciences, Hiroshima University School of Medicine, Kasumi 1-2-3, Minami-ku, 734-8551, Hiroshima, Japan.
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Tanonaka K, Furuhama KI, Yoshida H, Kakuta K, Miyamoto Y, Toga W, Takeo S. Protective effect of heat shock protein 72 on contractile function of perfused failing heart. Am J Physiol Heart Circ Physiol 2001; 281:H215-22. [PMID: 11406488 DOI: 10.1152/ajpheart.2001.281.1.h215] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
The contribution of heat shock protein 72 (HSP72) to the protection of cardiac function was examined in rats with chronic heat failure (CHF) following coronary artery ligation (CAL). The CAL animals revealed functional deterioration without low cardiac output 2 wk after CAL and with low cardiac output 8 wk after CAL, suggesting that CHF had developed by 8 wk after CAL. The hearts isolated from animals 2 and 8 wk after CAL (2-wk CAL heart and 8-wk CAL heart, respectively) were subjected to hyperthermia (at 42 degrees C) for 15 min, followed by 6-h perfusion (hyperthermia/6-h perfusion). The 2-wk CAL heart showed a 19.0 +/- 3.9% decline in the rate- pressure product (RPP) after hyperthermia/6-h perfusion, similar to the nonoperated control (19.8 +/- 2.9% decline). The production of myocardial HSP72 increased in the 2-wk CAL heart in response to hyperthermia (412.7 +/- 29.5% of each prehyperthermia value). The 8-wk CAL heart showed a reduction in the RPP (45.2 +/- 4.3% decline) after hyperthermia/6-h perfusion, associated with blunting of the production of HSP72 (68.9 +/- 22.6% increase, respectively). The results suggest that functional deterioration of the isolated failing heart may be attributed to a reduction in the production of myocardial HSP72.
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Affiliation(s)
- K Tanonaka
- Department of Pharmacology, Tokyo University of Pharmacy and Life Science, 1432 - 1 Horinouchi, Hachioji, Tokyo 192-0392, Japan
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Abstract
When cardiomyocytes are exposed to stresses, production of heat shock proteins (HSPs) in the cells is enhanced. Such increase in cellular HSP production is considered to bring about tolerance against stress-induced cell damage. The exact role of the cellular HSPs remains unclear. In the present study, HSPs in the viable left ventricular myocardium were determined during the development of heart failure following coronary artery ligation (CAL). The rats after CAL showed symptoms of chronic heart failure (CHF) at the 8th week, but not at the 1st and 2nd weeks. Myocardial HSP27, which may bind to cytoskeletal protein, at the 1st, 2nd, and 8th weeks after CAL was approximately 180, 160, and 125% of the control, respectively. Myocardial HSP60, one of mitochondrial proteins, at the 8th week increased to 140% of the control, whereas those at the 1st and 2nd weeks did not change. Myocardial HSP72, an inducible form of HSP70 family, at the 1st week after CAL increased to 180% of the control, whereas that at the 2nd or 8th week was similar to control. Myocardial heat shock constitutive protein 73 (HSC73), a constitutively expressed form of HSP70 family, and HSP90, which may bind to steroid hormone receptor and actin fiber, of CAL rats did not alter throughout the experiment. These findings show that diverse changes in the production of myocardial HSPs occur during the development of heart failure. Only the increase in myocardial HSP60 production was associated with the development of CHF.
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Affiliation(s)
- K Tanonaka
- Department of Pharmacology, Tokyo University of Pharmacy and Life Science, 1432-1 Horinouchi, Hachioji, Tokyo, 192-0392, Japan
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Abstract
We present use of minimally invasive video thoracoscopic surgery to perform complete extended thymectomy in patients with thymoma. These procedures were performed using a sternum-elevating method that provides a wide field of vision between the sternum and heart. Indications for this method are Masaoka Stage I, II and some Stage III (invasion to the lung and pericardium). This new method may be useful from the standpoint of minimal access, rapid recovery, less pain, and good cosmetic results.
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Affiliation(s)
- S Takeo
- Department of Thoracic Surgery, National Kyushu Medical Center Hospital, Fukuoka, Japan.
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Yoshida H, Tanonaka K, Miyamoto Y, Abe T, Takahashi M, Anand-Srivastava MB, Takeo S. Characterization of cardiac myocyte and tissue beta-adrenergic signal transduction in rats with heart failure. Cardiovasc Res 2001; 50:34-45. [PMID: 11282076 DOI: 10.1016/s0008-6363(01)00203-6] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
OBJECTIVE The cellular basis of alterations in beta-adrenergic signal transduction in rats with chronic heart failure (CHF) remains unclear. The aim of the present study was to examine this signal transduction system in isolated ventricular cardiomyocytes of rats with CHF. We focused on changes in the levels of stimulatory (Gs) and inhibitory G-proteins (Gi). METHODS CHF was induced in male Wistar rats by coronary artery ligation (CAL). Hemodynamic and biochemical parameters were measured 8 weeks after CAL. Alterations in contractile function and Ca(2+) transients via beta-adrenergic receptor signaling of cardiomyocytes isolated from rats with CHF were characterized by simultaneous measurements of cell shortening and fura-2 fluorescence intensity. RESULTS Coronary artery-ligated rats showed symptoms of CHF, such as decreased contractile function, increased left ventricular volume, decreased chamber stiffness, and about 40% infarct formation of the left ventricle, by 8 weeks after surgery. The contractile function and Ca(2+) dynamics of cardiomyocytes from the rats with CHF remained normal under basal conditions. Only cardiac cell length was increased. The responses of peak shortening, fura-2 fluorescence ratio amplitude, and cAMP content to beta-adrenoceptor stimulation were reduced in cardiomyocytes of the rats with CHF, whereas direct stimulation of adenylate cyclase did not affect the response of these variables. Cardiomyocyte Gsalpha protein was decreased, whereas no changes in Gialpha proteins were seen in these cells. Increases in tissue Gsalpha and Gialpha proteins in the scar zone were detected. The results on tissue levels of collagen and G-proteins in the viable left ventricle appeared to depend on the presence of nonmyocytes. CONCLUSIONS The results suggest that impaired contractile function of cardiomyocytes is unlikely to account for global LV contractile dysfunction, and that down-regulation of beta-adrenoceptors occurs in cardiomyocytes per se. The difference in changes of G-protein between the cardiomyocyte and myocardial tissue suggests an appreciable contribution of nonmyocytes to myocardial G-protein levels.
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Affiliation(s)
- H Yoshida
- Department of Pharmacology, Tokyo University of Pharmacy and Life Science, 1432-1 Horinouchi, Hachioji, Tokyo 192-0392, Japan
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Takagi K, Miyake K, Takagi N, Tadokoro M, Nakayama E, Nagakura A, Takeo S. Characterization of microsphere embolism-induced impairment of learning and memory function and the cholinergic system. Biol Pharm Bull 2001; 24:43-9. [PMID: 11201244 DOI: 10.1248/bpb.24.43] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
The impairments of learning and memory function and of the cholinergic system were examined in rats with microsphere embolism. Microsphere embolism was induced by injection of 900 microspheres with a diameter of 48 microm into the right internal carotid artery. The retention latency of a passive avoidance test was shortened and the escape latency of a water maze test was prolonged, when the animals were tested on the 5th to 10th day after the embolism, suggesting learning and memory dysfunction. Cholinergic parameters of the striatum and hippocampus, such as acetylcholine (ACh) content (67 and 60% decrease, respectively), choline acetyltransferase (ChAT) activity (45 and 56% decrease, respectively), and Bmax of muscarinic acetylcholine M1-receptor (43 and 37% decrease, respectively), were reduced on the 11th day after the embolism, suggesting attenuation of ACh synthesis and a decrease in the number of muscarinic acetylcholine M1-receptors mainly in the striatum and hippocampus. Areas not stained with triphenyltetrazolium chloride, an indication of infarction, were detected mainly in the striatum and hippocampus and partly in the frontal cortex on the 11th day after the embolism. The results suggest that an animal with microsphere embolism may be a good ischemic model with relatively sustained impairments of learning and memory function and of the striatal and hippocampal cholinergic system.
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Affiliation(s)
- K Takagi
- Department of Pharmacology, Tokyo University of Pharmacy & Life Science, Hachioji, Japan
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Kawana K, Miyamoto Y, Tanonaka K, Han-no Y, Yoshida H, Takahashi M, Takeo S. Cytoprotective mechanism of heat shock protein 70 against hypoxia/reoxygenation injury. J Mol Cell Cardiol 2000; 32:2229-37. [PMID: 11112998 DOI: 10.1006/jmcc.2000.1250] [Citation(s) in RCA: 31] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
The role of heat shock protein 70 (HSP70) in the cytoprotection against hypoxia/reoxygenation injury was examined. Adult rat cardiomyocytes were isolated, subjected to hyperthermia at 42 degrees C for 15 min (heat shock treatment), and then incubated at 37 degrees C for 3 to 24 h (HSP production process). Heat shock treatment increased HSP70 production (80-260% increase); the peak increase was seen after 9 h of HSP production process. Thereafter, the cells were subjected to 120-min hypoxia and 15-min reoxygenation. Heat shock treatment increased the survival of the cells subjected to hypoxia/reoxygenation (1.5-2.5-fold); the maximal cytoprotection was observed after 12 h of HSP production process. Heat shock treatment increased HSP70 content in the nucleus when cells were subjected to 12 h of HSP production process. To examine the role of HSP70 accumulation in the nuclear fraction, the activity of poly(ADP-ribose) synthetase (PARS), which functions in the nucleus and consumes high-energy phosphates excessively in the reoxygenated state, were measured in the cells with heat shock and 12 h of HSP production process. Heat shock treatment attenuated the hypoxia/reoxygenation-induced increase in the PARS activity (50% decrease). Treatment of the cells with 3-aminobenzamide, an inhibitor of PARS, exerted the effects similar to those of heat shock treatment. These results suggest that attenuation of the PARS activity in the nucleus may play an important role in the cytoprotective effect of HSP70 on hypoxia/reoxygenation injury.
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Affiliation(s)
- K Kawana
- Department of Pharmacology, Tokyo University of Pharmacy and Life Science, 1432-1 Horinouchi, Hachioji, Japan
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Takeo S, Elmoselhi AB, Goel R, Sentex E, Wang J, Dhalla NS. Attenuation of changes in sarcoplasmic reticular gene expression in cardiac hypertrophy by propranolol and verapamil. Mol Cell Biochem 2000; 213:111-8. [PMID: 11129949 DOI: 10.1023/a:1007120332587] [Citation(s) in RCA: 20] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Abstract
The effects of propranolol and verapamil on contractile dysfunction, subcellular remodeling and changes in gene expression in cardiac hypertrophy due to pressure overload were examined. Rats were subjected to banding of the abdominal aorta and then treated with either propranolol (10 mg/kg daily), verapamil (5 mg/kg daily) or vehicle for 8 weeks after the surgery. Depression of the left ventricular function in the hypertrophied heart was associated with decreases in myofibrillar and myosin Ca2+ ATPase activities as well as Ca2+-pump and Ca2+-release activities of the sarcoplasmic reticulum (SR). The level of alpha-myosin heavy chain (alpha-MHC) mRNA was decreased while that of beta-MHC mRNA was increased in the pressure-overloaded heart. The level of SR Ca2+-pump ATPase (SERCA2) mRNA and protein content for SERCA2 were decreased in the pressure overloaded heart. Treatment of the hypertrophied animals with propranolol or verapamil resulted in preservation of the left ventricular function and prevention of the subcellular alterations. Shift in the alpha- and beta-MHC mRNA levels and changes in the expression in SERCA2 mRNA level and protein content were also attenuated by these treatments. The results suggest that blockade of beta-adrenoceptors or voltage-dependent calcium channels normalizes the cardiac gene expression, prevents subcellular remodeling and thus attenuates heart dysfunction in rats with cardiac hypertrophy. Furthermore, both cardiac beta-adrenoceptors and L-type Ca2+-channels may be involved in the genesis of cardiac hypertrophy due to pressure overload.
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Affiliation(s)
- S Takeo
- Institute of Cardiovascular Sciences, St. Boniface General Hospital Research Centre, Manitoba, Winnipeg, Canada
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Takeo S, Nasa Y, Tanonaka K, Yamaguchi F, Yabe K, Hayashi H, Dhalla NS. Role of cardiac renin-angiotensin system in sarcoplasmic reticulum function and gene expression in the ischemic-reperfused heart. Mol Cell Biochem 2000; 212:227-35. [PMID: 11108155] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/18/2023]
Abstract
The aim of this study was to explore the possible participation of cardiac renin-angiotensin system (RAS) in the ischemia-reperfusion induced changes in heart function as well as Ca2+-handling activities and gene expression of cardiac sarcoplasmic reticulum (SR) proteins. The isolated rat hearts, treated for 10 min without and with 30 microM captopril or 100 microM losartan, were subjected to 30 min ischemia followed by reperfusion for 60 min and processed for the measurement of SR function and gene expression. Attenuated recovery of the left ventricular developed pressure (LVDP) upon reperfusion of the ischemic heart was accompanied by a marked reduction in SR Ca2+-pump ATPase, Ca2+-uptake and Ca2+-release activities. Northern blot analysis revealed that mRNA levels for SR Ca2+-handling proteins such as Ca2+-pump ATPase (SERCA2a), ryanodine receptor, calsequestrin and phospholamban were decreased in the ischemia-reperfused heart as compared with the non-ischemic control. Treatment with captopril improved the recovery of LVDP as well as SR Ca2+-pump ATPase and Ca2+-uptake activities in the postischemic hearts but had no effect on changes in Ca2+-release activity due to ischemic-reperfusion. Losartan neither affected the changes in contractile function nor modified alterations in SR Ca2+-handling activities. The ischemia-reperfusion induced decrease in mRNA levels for SR Ca2+-handling proteins were not affected by treatment with captopril or losartan. The results suggest that the improvement of cardiac function in the ischemic-reperfused heart by captopril is associated with the preservation of SR Ca2+-pump activities; however, it is unlikely that this action of captopril is mediated through the modification of cardiac RAS. Furthermore, cardiac RAS does not appear to contribute towards the ischemia-reperfusion induced changes in gene expression for SR Ca2+-handling proteins.
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Affiliation(s)
- S Takeo
- Department of Pharmacology, Tokyo University of Pharmacy and Life Science, Japan
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Takeo S, Tanonaka K, Kajiwara H, Miyake K, Antoku F, Mori H. The effects of a novel cyclohexane dicarboximide derivative, ST-6, on hypoxia/reoxygenation injury in perfused rat heart. Biol Pharm Bull 2000; 23:712-6. [PMID: 10864021 DOI: 10.1248/bpb.23.712] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
The present study was undertaken to test if some cyclohexane dicarboximide derivatives may have a cardioprotective effect against hypoxia/reoxygenation injury. Isolated rat hearts were subjected to 20-min of hypoxia followed by 45-min reoxygenation, and their recovery of post-hypoxic cardiac contractile function was examined. Treatment with agents was carried out from 3 min after the onset of hypoxia to the end of hypoxia (17 min during hypoxia). Among the 17 compounds, 2-[4-[4-(4-chlorophenyl)-4-hydroxy-1-piperidinyl]butyl]hexahydro-1H-i soindol-1,3(2H)-dione (ST-6) showed a significant enhancement of post-hypoxic contractile force. This was associated with attenuation of the releases of creatine kinase and purine nucleosides and bases from the perfused heart. Hypoxia-induced increase in myocardial sodium and decrease in potassium ion content was suppressed by ST-6 treatment. The results suggest that ST-6 is capable of protecting the heart against hypoxia/reoxygenation injury possibly through a mechanism by which sodium overload during hypoxia is suppressed.
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Affiliation(s)
- S Takeo
- Department of Pharmacology, Tokyo University of Pharmacy & Life Science, Hachioji, Japan.
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Abstract
OBJECTIVE A possible link between activation of PKC and improvement of energy metabolism during reperfusion in ischemic preconditioning hearts was examined. METHODS Isolated perfused rat hearts were preconditioned by 5-min ischemia and 5-min reperfusion in the presence and absence of a PKC inhibitor polymyxin B (50 microM) and then subjected to 40-min sustained ischemia and subsequent 30-min reperfusion. In another set of experiments, the hearts pretreated with and without a PKC activator PMA (15 pmol/5 min) were subjected to the sustained ischemia and reperfusion. Myocardial high-energy phosphates, glycolytic intermediates and mitochondrial oxygen consumption capacity were determined at appropriate experimental sequences. RESULTS Preconditioning enhanced the recovery of cardiac function such as left ventricular developed pressure, heart rate and rate-pressure product of the reperfused heart, suppressed the release of creatine kinase, enhanced the reperfusion-induced restoration of myocardial high-energy phosphates, attenuated the reperfusion-induced accumulation in glucose 6-phosphate and fructose 6-phosphate contents, abolished the ischemia-induced increase in tissue lactate content and prevented the ischemia-induced decrease in mitochondrial oxygen consumption capacity. Treatment of the perfused heart with PMA mimicked the effects of preconditioning on post-ischemic contractile function, enzyme release, levels of myocardial energy store, glycolytic intermediates and lactate, and mitochondrial function. Polymyxin B-treatment abolished the preconditioning-induced recovery of post-ischemic contractile function, the suppression of the release of CK, the restoration of myocardial energy store, and the preservation of mitochondrial function, whereas it did not cancel the improvement of glycolytic intermediate levels and the reduction in tissue lactate accumulation. Post-ischemic contractile function was closely related to restoration of high-energy phosphates and mitochondrial oxygen consumption capacity in all hearts subjected to ischemia/reperfusion. CONCLUSION The results suggest that activation of PKC and preservation of mitochondrial function are closely linked with each other in the preconditioned heart, which may lead to the improvement of post-ischemic contractile function.
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Affiliation(s)
- K Yabe
- Department of Pharmacology, Tokyo University of Pharmacy and Life Science, Hachioji, Japan
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Takeo S, Kokaze A, Ng CS, Mizuchi D, Watanabe JI, Tanabe K, Kojima S, Kita K. Succinate dehydrogenase in Plasmodium falciparum mitochondria: molecular characterization of the SDHA and SDHB genes for the catalytic subunits, the flavoprotein (Fp) and iron-sulfur (Ip) subunits. Mol Biochem Parasitol 2000; 107:191-205. [PMID: 10779596 DOI: 10.1016/s0166-6851(00)00185-7] [Citation(s) in RCA: 30] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
Abstract
Mitochondria of malaria parasites generate a membrane potential through an electron transport system that is a possible target of primaquine and a new anti-malarial drug, atovaquone. However, little information is available for conclusive understanding of the respiratory chain in Plasmodium mitochondria. In the present study, we cloned and characterized from Plasmodium falciparum the genes for the catalytic subunits, SDHA for the flavoprotein (Fp) and SDHB for iron-sulfur protein (Ip), of succinate-ubiquinone oxidoreductase (complex II), which is a marker enzyme for mitochondria and links the TCA cycle and respiratory chain directly. Each of the two genes contains a single open reading frame (ORF), which are located on different chromosomes, 1860 nucleotides on chromosome 10 for SDHA and 963 nucleotides on chromosome 12 for SDHB. The expression of these genes in asynchronous erythrocytic stage cells was confirmed by observation of 3.3 and 2.4 kb transcripts from the SDHA and SDHB genes, respectively. The SDHA and SDHB genes encode proteins of 620 (Fp) and 321 (Ip) amino acids with molecular masses of 69.2 and 37.8 kDa, respectively. A mitochondrial presequence essential for the import of mitochondrial proteins encoded by nuclear DNA, as well as almost all the conserved amino acids indispensable for substrate binding and the catalytic reaction were found in these peptides, indicating the functional importance of this enzyme in the parasite. Interestingly, a P. falciparum-specific insertion and a unicellular organism-specific deletion were found in the amino acid sequence of Fp. This is the first report of the primary structure of the protozoan succinate dehydrogenase.
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Affiliation(s)
- S Takeo
- Department of Biomedical Chemistry, Graduate School of Medicine, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo, Japan
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Tanonaka K, Takasaki A, Kajiwara H, Takeo S. Contribution of sodium channel and sodium/hydrogen exchanger to sodium accumulation in the ischemic myocardium. Gen Pharmacol 2000; 34:167-74. [PMID: 11120378 DOI: 10.1016/s0306-3623(00)00057-4] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
Contribution of sodium channels and sodium/hydrogen exchangers (NHEs) to sodium accumulation during ischemia in the ischemic/reperfused heart was examined. Ischemia increased the myocardial sodium. Reperfusion elicited a further increase in the myocardial sodium, which was associated with little recovery of the left ventricular developed pressure (LVDP) of the perfused heart. Treatment with tetrodotoxin or dimethylamirolide (DMA) dose-dependently attenuated the ischemia- and reperfusion-induced increase in myocardial sodium and enhanced the post-ischemic recovery of the LVDP. There was an inverse relationship between the increase in myocardial sodium during ischemia and the post-ischemic recovery of the LVDP.The myocardial sodium accumulation during ischemia is mainly attributed to sodium influx through sodium channels and NHEs.
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Affiliation(s)
- K Tanonaka
- Department of Pharmacology, Tokyo University of Pharmacy and Life Science, 1432-1 Horinouchi, Tokyo 192-0392, Hachioji, Japan
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Yoshioka S, Mitani H, Maeda K, Takeo S, Matsuda K, Katayama S, Mizukawa R, Kawahara R. Age-specific effects of noradrenergic alpha-2 agonist clonidine on the development of amygdaloid kindling in developing rats. Brain Res Dev Brain Res 2000; 119:283-8. [PMID: 10675779 DOI: 10.1016/s0165-3806(99)00179-0] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
Abstract
The effects of clonidine on the development of amygdaloid kindling were studied in rats of various ages (14, 21, 28 and 70 postnatal days). Administration of clonidine (0.2, 0.5 mg/kg i.p.) caused a significant retardation of kindling development in the 28-day-old rats as well as in the adult rats, whereas, in the 14-day-old rats, the development of kindling was significantly facilitated by clonidine. No significant effect of clonidine was observed in the 21-day-old rats. These results indicate that in rats the effects of clonidine on the development of amygdaloid kindling vary during development.
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Affiliation(s)
- S Yoshioka
- Department of Neuropsychiatry, Faculty of Medicine, Tottori University, 86, Nishi-machi, Yonago, Japan.
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Tanonaka K, Taguchi T, Koshimizu M, Ando T, Morinaka T, Yogo T, Konishi F, Takeo S. Role of an ATP-sensitive potassium channel opener, YM934, in mitochondrial energy production in ischemic/reperfused heart. J Pharmacol Exp Ther 1999; 291:710-6. [PMID: 10525091] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/14/2023] Open
Abstract
We examined a possible mechanism of action of an ATP-sensitive potassium (K(ATP)) channel opener, YM934, for the improvement of energy metabolism in hearts subjected to 35-min ischemia and 60-min reperfusion. The treatment with 30 nM YM934 for the final 15 min of preischemia enhanced postischemic recovery of left ventricular developed pressure, attenuated the postischemic rise in left ventricular end-diastolic pressure, and suppressed the release of creatine kinase and ATP metabolites during reperfusion. The treatment also restored myocardial ATP and creatine phosphate contents and attenuated the decrease in mitochondrial oxygen consumption rate during reperfusion. The higher mitochondrial function was also seen in YM934-treated hearts at the end of ischemia. In another set of experiments, myocardial skinned bundles were incubated for 30 min under hypoxic conditions in the presence and absence of YM934, and then mitochondrial oxygen consumption rate was determined. Hypoxia decreased the mitochondrial oxygen consumption rate of skinned bundles to approximately 40% of the prehypoxic value. In contrast, the treatment of skinned bundles with 30 nM YM934 preserved the mitochondrial oxygen consumption rate during hypoxia. The effect of YM934 on the hypoxic skinned bundles was abolished by combined treatment with either the K(ATP) channel blocker glyburide or the mitochondrial K(ATP) channel blocker 5-hydroxydecanoate in a concentration-dependent manner. The results suggest that YM934 is capable of attenuating ischemia/reperfusion injury of isolated perfused hearts due to preservation of mitochondrial function during ischemia, probably through opening of mitochondrial K(ATP) channels.
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Affiliation(s)
- K Tanonaka
- Department of Pharmacology, Tokyo University of Pharmacy and Life Science, Hachioji, Japan
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Taguchi T, Uchida W, Takenaka T, Takeo S. Reduction by ATP-sensitive potassium channel opener, YM934, of experimental myocardial infarct size in anesthetized dogs. Pharmacology 1999; 59:95-105. [PMID: 10450064 DOI: 10.1159/000028309] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
The present study was undertaken to examine whether the ATP-sensitive potassium channel opener, YM934, would be effective in reducing infarct size in a model of myocardial infarction in anesthetized dogs. For this purpose the effects of nifedipine, a calcium channel blocker, and hydralazine, a vasodilator with unknown mechanisms, were also investigated for comparison. Severe, irreversible myocardial injury was produced by a 90-min occlusion of the proximal left anterior descending coronary artery followed by 5 h of reperfusion. Infusion of YM934 (0.1 microg/kg/min i.c.) during the last 15 min of pre-ischemia reduced the myocardial infarct size and attenuated the release of creatine kinase MB eluted from the hearts without alteration in hemodynamic parameters including regional myocardial blood flow. In contrast, the other vasodilators, hydralazine and nifedipine, did not reduce myocardial infarct size under the same coronary vasodilatory conditions. These observations indicate that intracoronary YM934 is cardioprotective and that this effect is independent of alterations in regional myocardial blood flow.
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Affiliation(s)
- T Taguchi
- Cardiovascular Diseases Research, Pharmacology Laboratories, Institute for Drug Discovery Research, Yamanouchi Pharmaceutical Co. Ltd., Ibaraki, Japan.
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Abstract
A brief period of ischemia and reperfusion has been shown to protect the myocardium against subsequent sustained ischemia and reperfusion injury, which is called "preconditioning". A great number of investigators have explored the mechanisms underlying this preconditioning-induced cardioprotection. This article dealt with possible mechanisms of energy metabolism and mitochondrial activity for preconditioning-induced cardioprotection. Particularly, the contribution of energy metabolites produced during a brief period of ischemia and reperfusion injury, as well as mitochondrial function that is modified by changes in mitochondrial ATPase activity, opening of mitochondrial ATP-dependent potassium channels and production of free radicals in mitochondria, to ischemic preconditioning is discussed.
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Affiliation(s)
- S Takeo
- Department of Pharmacology, Tokyo University of Pharmacy and Life Science, Hachioji, Japan.
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Taguchi T, Uchida W, Takenaka T, Takeo S. Cardioprotective effects of YM934, an ATP-sensitive potassium channel opener, on stunned myocardium in anesthetized dogs. Gen Pharmacol 1999; 32:695-703. [PMID: 10401995 DOI: 10.1016/s0306-3623(98)00237-7] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The effects of YM934 [2-(3,4-dihydro-2,2-dimethyl-6-nitro-2H-1,4-benzoxazin-4-yl) pyridine N-oxide], an adenosine triphosphate (ATP)-sensitive potassium channel opener, on stunned myocardium were examined. Forty eight anesthetized dogs were subjected to 15 min of left anterior descending (LAD) coronary artery occlusion followed by 3 hours of reperfusion. To elucidate the possible contribution of the cardioprotective property of YM934 to stunned myocardium, a nonhypotensive dose of YM934 was directly injected into the LAD coronary artery before the ischemic insults. Intracoronary artery infusion (i.c.) of YM934 (0.1 microg/kg/min) produced a marked improvement in post-ischemic regional contractile dysfunction. The effects were not associated with improvement of hemodynamics, including regional myocardial blood flow during ischemia, heart rate and mean arterial blood pressure. The anatomic areas at risk expressed as a percentage of the left ventricle and regional myocardial blood flow were not significantly different between groups. The cardioprotective effect of YM934 was completely blocked by pretreatment with an ATP-sensitive potassium channel blocker, glibenclamide (1.0 mg/kg i.v. bolus). These results suggest that YM934 exerts cardioprotective effect on stunned myocardium through opening myocardial ATP-sensitive potassium channels.
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Affiliation(s)
- T Taguchi
- Pharmacology Laboratories, Institute for Drug Discovery Research, Yamanouchi Pharmaceutical Co., Tsukuba, Ibaraki, Japan.
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