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Takahashi K, Inuzuka T, Shimizu Y, Sawamoto K, Taniue K, Ono Y, Asai F, Koyama K, Sato H, Kawabata H, Iwamoto H, Yamakita K, Kitano Y, Teramoto T, Fujiya M, Fujii S, Mizukami Y, Okumura T. Liquid Biopsy for Pancreatic Cancer by Serum Extracellular Vesicle-Encapsulated Long Noncoding RNA HEVEPA. Pancreas 2024; 53:e395-e404. [PMID: 38416857 DOI: 10.1097/mpa.0000000000002315] [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] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 03/01/2024]
Abstract
OBJECTIVES The role of long noncoding RNAs (lncRNAs) in pancreatic ductal adenocarcinoma (PDAC) remain unclear. Extracellular vesicle (EV)-encapsulated RNAs could be effective targets for liquid biopsy. We aimed to identify previously unknown EV-encapsulated lncRNAs in PDAC and establish highly accurate methods for isolating EVs. MATERIALS AND METHODS Extracellular vesicles were isolated using existing and newly developed methods, namely, PEViA-UC and PEViA-IP, from serum samples of 20 patients with PDAC, 22 patients with intraductal papillary mucinous neoplasms, and 21 healthy individuals. Extracellular vesicle lncRNA expression was analyzed using digital PCR. RESULTS Gene expression analysis using cDNA microarray revealed a highly expressed lncRNA, HEVEPA , in serum EVs from patients with PDAC. We established PEViA-UC and PEViA-IP using PEViA reagent, ultracentrifugation, and immunoprecipitation. Although detection of EV-encapsulated HEVEPA using existing methods is challenging, PEViA-UC and PEViA-IP detected EV HEVEPA , which was highly expressed in patients with PDAC compared with non-PDAC patients. The detection sensitivity for discriminating PDAC from non-PDAC using the combination of HEVEPA and HULC , which are highly expressed lncRNAs in PDAC, and carbohydrate antigen 19-9 (CA19-9), was higher than that of HEVEPA , HULC , or CA19-9 alone. CONCLUSIONS Extracellular vesicle lncRNAs isolated using PEViA-IP and CA19-9 together could be effective targets in liquid biopsy for PDAC diagnosis.
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Affiliation(s)
- Kenji Takahashi
- From the Division of Gastroenterology, Department of Medicine, Asahikawa Medical University, Asahikawa, Hokkaido
| | | | | | - Kazuki Sawamoto
- From the Division of Gastroenterology, Department of Medicine, Asahikawa Medical University, Asahikawa, Hokkaido
| | | | - Yusuke Ono
- Institute of Biomedical Research, Sapporo Higashi Tokushukai Hospital, Sapporo
| | - Fumi Asai
- H.U. Group Research Institute G.K., Akiruno
| | - Kazuya Koyama
- From the Division of Gastroenterology, Department of Medicine, Asahikawa Medical University, Asahikawa, Hokkaido
| | - Hiroki Sato
- From the Division of Gastroenterology, Department of Medicine, Asahikawa Medical University, Asahikawa, Hokkaido
| | - Hidemasa Kawabata
- From the Division of Gastroenterology, Department of Medicine, Asahikawa Medical University, Asahikawa, Hokkaido
| | - Hidetaka Iwamoto
- From the Division of Gastroenterology, Department of Medicine, Asahikawa Medical University, Asahikawa, Hokkaido
| | - Keisuke Yamakita
- From the Division of Gastroenterology, Department of Medicine, Asahikawa Medical University, Asahikawa, Hokkaido
| | - Yohei Kitano
- From the Division of Gastroenterology, Department of Medicine, Asahikawa Medical University, Asahikawa, Hokkaido
| | - Takashi Teramoto
- Division of Mathematics, Asahikawa Medical University, Asahikawa, Hokkaido
| | - Mikihiro Fujiya
- From the Division of Gastroenterology, Department of Medicine, Asahikawa Medical University, Asahikawa, Hokkaido
| | - Satoshi Fujii
- Department of Laboratory Medicine, Asahikawa Medical University, Asahikawa, Hokkaido, Japan
| | - Yusuke Mizukami
- From the Division of Gastroenterology, Department of Medicine, Asahikawa Medical University, Asahikawa, Hokkaido
| | - Toshikatsu Okumura
- From the Division of Gastroenterology, Department of Medicine, Asahikawa Medical University, Asahikawa, Hokkaido
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Sato H, Kawabata H, Iwamoto H, Okada T, Fujibayashi S, Takahashi K, Kitano Y, Goto T, Mizukami Y, Okumura T, Fujiya M. New gel immersion endoscopic ultrasonography technique for accurate periampullary evaluation. Surg Endosc 2024; 38:2297-2304. [PMID: 38499782 DOI: 10.1007/s00464-024-10762-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [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: 09/02/2023] [Accepted: 02/17/2024] [Indexed: 03/20/2024]
Abstract
BACKGROUND Visualization of the pancreatobiliary junction is one of the challenges faced by endoscopic ultrasonography (EUS). The water-filling technique, which allows for the observation of the ampulla at a suitable distance by injecting water into the lumen of the duodenum, was used for this purpose. However, a new gel immersion technique has recently been introduced for visualizing the gastrointestinal tract. This study investigated the effectiveness of visualizing the pancreatobiliary junction in EUS by comparing both water filling and the new gel immersion technique in identical cases. METHODS The study ran from June to December 2021. Ten images from each technique were retrospectively compared by three independent researchers. The primary result of the study was the number of images depicting the "Pancreatic and Biliary Ducts Penetrating the Duodenal Muscularis Propria" (defined as Excellent observation) in each technique. The secondary outcome was defined as gel immersion technique's safety and impact on duodenal lumen distension. RESULTS Ten patients used the gel immersion technique. All patients underwent the water-filling technique first, followed by gel injection after the water was completely aspirated. The average number of pictures rated as "Excellent observation," which is the primary outcome, was significantly higher with the gel immersion technique than with water filling, and no adverse events were observed. The subanalysis revealed that both convex and radial echoendoscopes are equally effective at depicting the ampulla with the gel immersion technique. CONCLUSIONS The ability to depict the pancreatobiliary junction using the gel immersion technique is superior to that of the water-filling method, which may allow for a more detailed assessment of the ampullary region with both radial and convex echoendoscopes. This can be a useful EUS technique for diagnosing pancreaticobiliary maljunction or periampullary tumors.
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Affiliation(s)
- Hiroki Sato
- Division of Gastroenterology, Department of Internal Medicine, Asahikawa Medical University, 2-1 Midorigaoka-Higashi, Asahikawa, Hokkaido, 078-8510, Japan
| | - Hidemasa Kawabata
- Division of Gastroenterology, Department of Internal Medicine, Asahikawa Medical University, 2-1 Midorigaoka-Higashi, Asahikawa, Hokkaido, 078-8510, Japan
| | - Hidetaka Iwamoto
- Division of Gastroenterology, Department of Internal Medicine, Asahikawa Medical University, 2-1 Midorigaoka-Higashi, Asahikawa, Hokkaido, 078-8510, Japan
| | - Tetsuhiro Okada
- Division of Gastroenterology, Department of Internal Medicine, Asahikawa Medical University, 2-1 Midorigaoka-Higashi, Asahikawa, Hokkaido, 078-8510, Japan
| | - Shugo Fujibayashi
- Division of Gastroenterology, Department of Internal Medicine, Asahikawa Medical University, 2-1 Midorigaoka-Higashi, Asahikawa, Hokkaido, 078-8510, Japan
| | - Kenji Takahashi
- Division of Gastroenterology, Department of Internal Medicine, Asahikawa Medical University, 2-1 Midorigaoka-Higashi, Asahikawa, Hokkaido, 078-8510, Japan
| | - Yohei Kitano
- Division of Gastroenterology, Department of Internal Medicine, Asahikawa Medical University, 2-1 Midorigaoka-Higashi, Asahikawa, Hokkaido, 078-8510, Japan
| | - Takuma Goto
- Division of Gastroenterology, Department of Internal Medicine, Asahikawa Medical University, 2-1 Midorigaoka-Higashi, Asahikawa, Hokkaido, 078-8510, Japan
| | - Yusuke Mizukami
- Division of Gastroenterology, Department of Internal Medicine, Asahikawa Medical University, 2-1 Midorigaoka-Higashi, Asahikawa, Hokkaido, 078-8510, Japan
| | - Toshikatsu Okumura
- Division of Gastroenterology, Department of Internal Medicine, Asahikawa Medical University, 2-1 Midorigaoka-Higashi, Asahikawa, Hokkaido, 078-8510, Japan
| | - Mikihiro Fujiya
- Division of Gastroenterology, Department of Internal Medicine, Asahikawa Medical University, 2-1 Midorigaoka-Higashi, Asahikawa, Hokkaido, 078-8510, Japan.
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Kobayashi S, Suzuki M, Ueno M, Maruki Y, Okano N, Todaka A, Ozaka M, Tsuji K, Shioji K, Doi K, Kojima Y, Tsumura H, Tanaka K, Higuchi H, Kawabe K, Imaoka H, Yamashita T, Miwa H, Nagano H, Arima S, Hayashi H, Naganuma A, Yamaguchi H, Hisano T, Umemoto K, Ishii S, Nakashima K, Suzuki R, Kitano Y, Misumi T, Furuse J, Ishii H. Comparing the Efficacy and Safety of Gemcitabine plus Nab-Paclitaxel versus Gemcitabine Alone in Older Adults with Unresectable Pancreatic Cancer. Oncologist 2022; 27:e774-e782. [PMID: 35946841 PMCID: PMC9526497 DOI: 10.1093/oncolo/oyac157] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/20/2022] [Accepted: 06/27/2022] [Indexed: 12/05/2022] Open
Abstract
Background Gemcitabine plus nab-paclitaxel (GnP) has been a standard treatment for unresectable pancreatic cancer (uPC); however, the current treatment status and usefulness in older adults with uPC remain unclear. Therefore, we aimed to investigate the patient background and compare the efficacy and safety of GnP versus other treatments in older adults with uPC. Patients and Methods In this prospective observational study, we enrolled 233 eligible patients aged ≥76 years with pathologically proven, clinically uPC, and no history of chemotherapy from 55 Japanese centers during September 2018-September 2019. The main endpoints were overall survival (OS), progression-free survival (PFS), and safety. Geriatric assessments were performed upon registration and after 3 months. To adjust for confounders, we conducted propensity score-matched analyses. Results GnP, gemcitabine alone (Gem), best supportive care, and other therapies were administered to 116, 72, 16, and 29 patients, respectively. In the propensity score-matched analysis, 42 patients each were selected from the GnP and Gem groups. The median OS was longer in the GnP group than in the Gem group (12.2 vs. 9.4 months; hazard ratio [HR], 0.65; 95% CI, 0.37-1.13). The median PFS was significantly longer in the GnP group than in the Gem group (9.2 vs. 3.7 months; HR, 0.38; 95% CI, 0.23-0.64). The incidence of severe adverse events was higher with GnP than with Gem; however, the difference was not significant. Conclusion GnP is more efficacious than Gem in patients aged ≥76 years with uPC despite demonstrating a higher incidence of severe adverse events.
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Affiliation(s)
- Satoshi Kobayashi
- Department of Gastroenterology, Kanagawa Cancer Center, Yokohama City, Japan
| | - Motoko Suzuki
- Department of Data Science, National Cancer Center Hospital East, Kashiwa City, Japan
| | - Makoto Ueno
- Department of Gastroenterology, Kanagawa Cancer Center, Yokohama City, Japan
| | - Yuta Maruki
- Department of Gastroenterology, Hepatobiliary and Pancreatic Medical Oncology Division, National Cancer Center Hospital, Chuo-ku, Japan
| | - Naohiro Okano
- Department of Medical Oncology, Kyorin University Faculty of Medicine, Mitaka City, Japan
| | - Akiko Todaka
- Division of Gastrointestinal Oncology, Shizuoka Cancer Center, Shunto-Gun, Japan
| | - Masato Ozaka
- Department of Gastroenterology, The Cancer Institute Hospital, Japanese Foundation for Cancer Research, Koto-ku, Japan
| | - Kunihiro Tsuji
- Department of Gastroenterology, Ishikawa Prefectural Central Hospital, Kanazawa City, Japan
| | - Kazuhiko Shioji
- Department of Internal Medicine, Niigata Cancer Center Hospital, Niigata City, Japan
| | - Keitaro Doi
- Department of Therapeutic Oncology, Kyoto University, Graduate School of Medicine, Kyoto City, Japan
| | - Yasushi Kojima
- Department of Gastroenterology, National Center for Global Health and Medicine, Shinjuku-ku, Japan
| | - Hidetaka Tsumura
- Department of Gastroenterological Oncology, Hyogo Cancer Center, Akashi City, Japan
| | - Kazunari Tanaka
- Center for Gastroenterology, Teine Keijinkai Hospital, Sapporo City, Japan
| | - Hajime Higuchi
- Department of Clinical Oncology, International University of Health and Welfare, Narita Hospital, Narita City, Japan
| | - Ken Kawabe
- Department of Gastroenterology, Clinical Research Institute, National Hospital Organization Kyushu Medical Center, Fukuoka City, Japan
| | - Hiroshi Imaoka
- Department of Hepatobiliary and Pancreatic Oncology, National Cancer Center Hospital East, Kashiwa City, Japan
| | - Tatsuya Yamashita
- Department of Gastroenterology, Kanazawa University Graduate School of Medicine Sciences, Kanazawa City, Japan
| | - Haruo Miwa
- Gastroenterological Center, Yokohama City University Medical Center, Yokohama City, Japan
| | - Hiroaki Nagano
- Department of Gastroenterological, Breast and Endocrine Surgery, Yamaguchi University Graduate School of Medicine, Ube City, Japan
| | - Shiho Arima
- Digestive and Lifestyle Diseases, Kagoshima University Graduate School of Medical and Dental Sciences, Kagoshima University Graduate School of Medical and Dental Sciences, Kagoshima City, Japan
| | - Hideyuki Hayashi
- Genomics Unit, Keio Cancer Center, Keio University School of Medicine, Japan
| | - Atsushi Naganuma
- Department of Gastroenterology, National Hospital Organization Takasaki General Medical Center, Shinjuku-ku, Japan
| | | | - Terumasa Hisano
- Department of Hepato-Biliary-Pancreatology, National Hospital Organization Kyushu Cancer Center, Fukuoka City, Japan
| | - Kumiko Umemoto
- Department of Clinical Oncology, St. Marianna University School of Medicine, Kawasaki City, Japan
| | - Shuji Ishii
- Department of Gastroenterology and Hepatology, Osaka General Medical Center, Osaka City, Japan
| | - Koji Nakashima
- Department of Clinical Oncology, University of Miyazaki Hospital, Miyazaki City, Japan
| | - Rei Suzuki
- Department of Gastroenterology, Fukushima Medical University, Fukushima City, Japan
| | - Yohei Kitano
- Division of Metabolism and Biosystemic Science, Gastroenterology and Hematology/Oncology, Department of Medicine, Asahikawa Medical University, Asahikawa City, Japan
| | - Toshihiro Misumi
- Department of Data Science, National Cancer Center Hospital East, Kashiwa City, Japan
| | - Junji Furuse
- Department of Medical Oncology, Kyorin University Faculty of Medicine, Mitaka City, Japan
| | - Hiroshi Ishii
- Clinical Research Center, Chiba Cancer Center, Chiba City, Japan
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Tanaka K, Tanabe H, Sato H, Ishikawa C, Goto M, Yanagida N, Akabane H, Yokohama S, Hasegawa K, Kitano Y, Sugiyama Y, Uehara K, Kobayashi Y, Murakami Y, Kunogi T, Sasaki T, Takahashi K, Ando K, Ueno N, Kashima S, Moriichi K, Sato K, Yuzawa S, Tanino M, Taruiishi M, Sumi Y, Mizukami Y, Fujiya M, Okumura T. Prognostic factors to predict the survival in patients with advanced gastric cancer who receive later-line nivolumab monotherapy-The Asahikawa Gastric Cancer Cohort Study (AGCC). Cancer Med 2022; 11:406-416. [PMID: 34845844 PMCID: PMC8729046 DOI: 10.1002/cam4.4461] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/26/2021] [Revised: 10/21/2021] [Accepted: 11/08/2021] [Indexed: 02/05/2023] Open
Abstract
BACKGROUND Chemotherapy for advanced gastric cancer is recommended in the guidelines; however, later-line treatment remains controversial. Since immune checkpoint inhibitors have been used for the treatment of various malignancies, trials have been performed for gastric cancer. A phase 3 trial indicated the survival benefit of nivolumab monotherapy for gastric cancer patients treated with prior chemotherapy regimens. PATIENTS AND METHODS A regional cohort study was undertaken to determine the real-world data of nivolumab treatment for patients with advanced or recurrent gastric cancer. The patients were enrolled for 2 years from October 2017 to October 2019 and were prospectively followed for 1 year to examine the overall survival (OS). The patient characteristics were analyzed in a multivariate analysis and a nomogram to predict the probability of survival was generated. RESULTS In total, 70 patients who received nivolumab as ≥third-line chemotherapy were included in the Asahikawa Gastric Cancer Cohort. The median OS was 7.5 (95% CI, 4.8-10.2) months and the response rate was 18.6%. Diffuse type classification, bone metastasis, high neutrophil/lymphocyte ratio, and high CRP were associated with poor OS/prognosis in the multivariate analysis. A nomogram was developed based on these clinical parameters and the concordance index was 0.80 (95% CI, 0.68-0.91). The responders were aged and were frequently diagnosed with intestinal type gastric cancer, including patients with a HER2-positive status (27.3%) or microsatellite instability-high (27.3%) status. CONCLUSIONS The regional cohort study of nivolumab monotherapy for gastric cancer patients revealed prognostic factors and a nomogram was developed that could predict the probability of survival.
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Affiliation(s)
- Kazuyuki Tanaka
- Department of GastroenterologyAsahikawa Kosei HospitalAsahikawa HokkaidoJapan
| | - Hiroki Tanabe
- Division of Metabolism and Biosystemic Science, Gastroenterology and Hematology/Oncology Department of MedicineAsahikawa Medical UniversityAsahikawa HokkaidoJapan
| | - Hiroki Sato
- Division of Metabolism and Biosystemic Science, Gastroenterology and Hematology/Oncology Department of MedicineAsahikawa Medical UniversityAsahikawa HokkaidoJapan
| | - Chisato Ishikawa
- Department of GastroenterologyJapanese Red Cross Asahikawa HospitalAsahikawa HokkaidoJapan
| | - Mitsuru Goto
- Department of GastroenterologyAsahikawa Kosei HospitalAsahikawa HokkaidoJapan
| | - Naoyuki Yanagida
- Department of SurgeryAsahikawa Kosei HospitalAsahikawa HokkaidoJapan
| | - Hiromitsu Akabane
- Department of SurgeryAsahikawa Kosei HospitalAsahikawa HokkaidoJapan
| | - Shiro Yokohama
- Department of GastroenterologyAsahikawa Medical CenterAsahikawa HokkaidoJapan
| | - Kimiharu Hasegawa
- Division of Gastrointestinal SurgeryAsahikawa Medical UniversityAsahikawa HokkaidoJapan
| | - Yohei Kitano
- Division of Metabolism and Biosystemic Science, Gastroenterology and Hematology/Oncology Department of MedicineAsahikawa Medical UniversityAsahikawa HokkaidoJapan
| | - Yuya Sugiyama
- Division of Metabolism and Biosystemic Science, Gastroenterology and Hematology/Oncology Department of MedicineAsahikawa Medical UniversityAsahikawa HokkaidoJapan
| | - Kyoko Uehara
- Division of Metabolism and Biosystemic Science, Gastroenterology and Hematology/Oncology Department of MedicineAsahikawa Medical UniversityAsahikawa HokkaidoJapan
| | - Yu Kobayashi
- Division of Metabolism and Biosystemic Science, Gastroenterology and Hematology/Oncology Department of MedicineAsahikawa Medical UniversityAsahikawa HokkaidoJapan
| | - Yuki Murakami
- Division of Metabolism and Biosystemic Science, Gastroenterology and Hematology/Oncology Department of MedicineAsahikawa Medical UniversityAsahikawa HokkaidoJapan
| | - Takehito Kunogi
- Division of Metabolism and Biosystemic Science, Gastroenterology and Hematology/Oncology Department of MedicineAsahikawa Medical UniversityAsahikawa HokkaidoJapan
| | - Takahiro Sasaki
- Division of Metabolism and Biosystemic Science, Gastroenterology and Hematology/Oncology Department of MedicineAsahikawa Medical UniversityAsahikawa HokkaidoJapan
| | - Keitaro Takahashi
- Division of Metabolism and Biosystemic Science, Gastroenterology and Hematology/Oncology Department of MedicineAsahikawa Medical UniversityAsahikawa HokkaidoJapan
| | - Katsuyoshi Ando
- Division of Metabolism and Biosystemic Science, Gastroenterology and Hematology/Oncology Department of MedicineAsahikawa Medical UniversityAsahikawa HokkaidoJapan
| | - Nobuhiro Ueno
- Division of Metabolism and Biosystemic Science, Gastroenterology and Hematology/Oncology Department of MedicineAsahikawa Medical UniversityAsahikawa HokkaidoJapan
| | - Shin Kashima
- Division of Metabolism and Biosystemic Science, Gastroenterology and Hematology/Oncology Department of MedicineAsahikawa Medical UniversityAsahikawa HokkaidoJapan
| | - Kentaro Moriichi
- Division of Metabolism and Biosystemic Science, Gastroenterology and Hematology/Oncology Department of MedicineAsahikawa Medical UniversityAsahikawa HokkaidoJapan
| | - Keisuke Sato
- Department of PathologyAsahikawa Kosei HospitalAsahikawa HokkaidoJapan
| | - Sayaka Yuzawa
- Department of Diagnostic PathologyAsahikawa Medical University HospitalAsahikawa Medical UniversityAsahikawaHokkaidoJapan
| | - Mishie Tanino
- Department of Diagnostic PathologyAsahikawa Medical University HospitalAsahikawa Medical UniversityAsahikawaHokkaidoJapan
| | - Masaki Taruiishi
- Department of GastroenterologyAsahikawa City HospitalAsahikawa HokkaidoJapan
| | - Yasuo Sumi
- Division of Gastrointestinal SurgeryAsahikawa Medical UniversityAsahikawa HokkaidoJapan
| | - Yusuke Mizukami
- Division of Metabolism and Biosystemic Science, Gastroenterology and Hematology/Oncology Department of MedicineAsahikawa Medical UniversityAsahikawa HokkaidoJapan
| | - Mikihiro Fujiya
- Division of Metabolism and Biosystemic Science, Gastroenterology and Hematology/Oncology Department of MedicineAsahikawa Medical UniversityAsahikawa HokkaidoJapan
| | - Toshikatsu Okumura
- Division of Metabolism and Biosystemic Science, Gastroenterology and Hematology/Oncology Department of MedicineAsahikawa Medical UniversityAsahikawa HokkaidoJapan
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Takahashi K, Koyama K, Ota Y, Iwamoto H, Yamakita K, Fujii S, Kitano Y. The Interaction Between Long Non-coding RNA HULC and MicroRNA-622 via Transfer by Extracellular Vesicles Regulates Cell Invasion and Migration in Human Pancreatic Cancer. Front Oncol 2020; 10:1013. [PMID: 32656089 PMCID: PMC7324724 DOI: 10.3389/fonc.2020.01013] [Citation(s) in RCA: 20] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/17/2020] [Accepted: 05/21/2020] [Indexed: 12/13/2022] Open
Abstract
Although non-coding RNAs (ncRNAs) are involved in disease pathogenesis, their contributions to pancreatic ductal adenocarcinoma (PDAC) remain unclear. Recently, the interrelationship between two classes of ncRNA, long non-coding RNAs (lncRNAs), and microRNAs (miRNAs), has been reported to contribute to the epigenetic regulation of gene expression in several diseases including cancers. Moreover, some ncRNAs can be transferred by extracellular vesicles (EVs) from their donor cells to recipient cells. We previously verified that lncRNA HULC is up-regulated in PDAC cells and the intercellular transfer of HULC by EVs can promote PDAC cell invasion and migration through the induction of epithelial–mesenchymal transition (EMT). Therefore, we identified the miRNA that could target HULC and investigated the functional contributions of the miRNA–HULC interaction and EV transfer of miRNA to the EMT pathway in PDAC. Microarray analysis revealed 187 miRNAs that were decreased to <0.87-fold in Panc-1 cells treated with TGF-β compared with the control. Of these, miR-622 was predicted to target HULC directly by bioinformatics analysis. Expression of miR-622 was significantly down-regulated by TGF-β in a panel of PDAC cells. miR-622 overexpression by a miRNA mimic significantly decreased HULC expression, increased E-cadherin expression, and decreased expression of Snail, N-cadherin, and vimentin. Moreover, overexpression of miR-622 significantly reduced cell invasion and migration whereas inhibition of miR-622 increased HULC expression and promoted EMT signaling, invasion, and migration of PDAC cells. Furthermore, incubation with miR-622-overexpressing EVs could transfer miR-622, which significantly elevated miR-622 expression and decreased cell invasion and migration via inhibition of the EMT pathway in recipient PDAC cells. These results provide mechanistic insights into the development of PDAC by demonstrating that miR-622, as a miRNA downregulated by TGF-β, could target HULC and suppress invasion and migration by inhibiting EMT signaling via EV transfer. These observations may identify EV-encapsulated miRNA as a novel therapeutic target for human PDAC.
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Affiliation(s)
- Kenji Takahashi
- Division of Metabolism and Biosystemic Science, Department of Medicine, Asahikawa Medical University, Asahikawa, Japan
| | - Kazuya Koyama
- Division of Metabolism and Biosystemic Science, Department of Medicine, Asahikawa Medical University, Asahikawa, Japan
| | - Yu Ota
- Division of Metabolism and Biosystemic Science, Department of Medicine, Asahikawa Medical University, Asahikawa, Japan
| | - Hidetaka Iwamoto
- Division of Metabolism and Biosystemic Science, Department of Medicine, Asahikawa Medical University, Asahikawa, Japan
| | - Keisuke Yamakita
- Division of Metabolism and Biosystemic Science, Department of Medicine, Asahikawa Medical University, Asahikawa, Japan
| | - Satoshi Fujii
- Department of Laboratory Medicine, Asahikawa Medical University, Asahikawa, Japan
| | - Yohei Kitano
- Division of Metabolism and Biosystemic Science, Department of Medicine, Asahikawa Medical University, Asahikawa, Japan
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Takahashi K, Ota Y, Kogure T, Suzuki Y, Iwamoto H, Yamakita K, Kitano Y, Fujii S, Haneda M, Patel T, Ota T. Circulating extracellular vesicle-encapsulated HULC is a potential biomarker for human pancreatic cancer. Cancer Sci 2019; 111:98-111. [PMID: 31715081 PMCID: PMC6942436 DOI: 10.1111/cas.14232] [Citation(s) in RCA: 69] [Impact Index Per Article: 13.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/16/2019] [Revised: 11/04/2019] [Accepted: 11/05/2019] [Indexed: 12/13/2022] Open
Abstract
The role of long noncoding RNAs (lncRNAs) in the epithelial‐mesenchymal transition (EMT) in pancreatic ductal adenocarcinoma (PDAC) is unclear. Some lncRNAs can be transferred by extracellular vesicles (EVs) and have potential as biomarkers. Here, we identify an lncRNA that could serve as a biomarker for PDAC and show the functional roles of the lncRNA. Expression profiling of lncRNAs revealed that highly upregulated in liver cancer (HULC) was highly expressed, and induced, by transforming growth factor‐β in PDAC cells and their EVs. Knockdown of HULC decreased PDAC cell invasion and migration by inhibiting the EMT. Thus, HULC could be transferred by EVs, and promote EMT, invasion, and migration in recipient PDAC cells. To assess the roles of HULC, PDAC cell xenografts in nude mice were established. Knockdown of HULC in PDAC cells implanted in mice inhibited tumor growth. Moreover, microRNA‐133b suppressed PDAC cell invasion and migration by inhibiting the EMT through targeting HULC. Furthermore, serum samples were obtained from 20 PDAC and 22 intraductal papillary mucinous neoplasm (IPMN) patients, as well as 21 healthy individuals. Analysis of serum EV HULC expression by digital PCR showed that HULC expression was significantly increased in PDAC patients compared to healthy individuals or IPMN patients. Additionally, HULC showed good predictive performance for discriminating PDAC, suggesting that the analysis of EV‐encapsulated HULC would contribute to the diagnosis for human PDAC. Extracellular vesicle‐transported HULC promotes cell invasion and migration by inducing the EMT, and microRNA‐133b suppresses the EMT by targeting HULC. Extracellular vesicle‐encapsulated HULC could be a potential circulating biomarker for human PDAC.
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Affiliation(s)
- Kenji Takahashi
- Division of Metabolism and Biosystemic Science, Department of Medicine, Asahikawa Medical University, Asahikawa, Japan
| | - Yu Ota
- Division of Metabolism and Biosystemic Science, Department of Medicine, Asahikawa Medical University, Asahikawa, Japan
| | - Takayuki Kogure
- Division of Gastroenterology, Tohoku Medical and Pharmaceutical University, Sendai, Japan
| | - Yuko Suzuki
- Division of Metabolism and Biosystemic Science, Department of Medicine, Asahikawa Medical University, Asahikawa, Japan
| | - Hidetaka Iwamoto
- Division of Metabolism and Biosystemic Science, Department of Medicine, Asahikawa Medical University, Asahikawa, Japan
| | - Keisuke Yamakita
- Division of Metabolism and Biosystemic Science, Department of Medicine, Asahikawa Medical University, Asahikawa, Japan
| | - Yohei Kitano
- Division of Metabolism and Biosystemic Science, Department of Medicine, Asahikawa Medical University, Asahikawa, Japan
| | - Satoshi Fujii
- Department of Laboratory Medicine, Asahikawa Medical University, Asahikawa, Japan
| | - Masakazu Haneda
- Division of Metabolism and Biosystemic Science, Department of Medicine, Asahikawa Medical University, Asahikawa, Japan
| | - Tushar Patel
- Departments of Internal Medicine, Transplantation and Cancer Biology, Mayo Clinic, Jacksonville, FL, USA
| | - Tsuguhito Ota
- Division of Metabolism and Biosystemic Science, Department of Medicine, Asahikawa Medical University, Asahikawa, Japan
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Yamakita K, Kitano Y, Suzuki Y, Iwamoto H, Takahashi K, Ota T. Economic and safety evaluation of 5-HT3 recepter antagonist conversion from palonosetron to granisetron in highly and moderately emetogenic chemotherapy: A prospective study. Ann Oncol 2019. [DOI: 10.1093/annonc/mdz434.006] [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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8
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Allard MA, Nishioka Y, Beghdadi N, Imai K, Gelli M, Yamashita S, Kitano Y, Kokudo T, Yamashita YI, Sa Cunha A, Vibert E, Elias D, Cherqui D, Goere D, Adam R, Baba H, Hasegawa K. Multicentre study of perioperative versus adjuvant chemotherapy for resectable colorectal liver metastases. BJS Open 2019; 3:678-686. [PMID: 31592094 PMCID: PMC6773651 DOI: 10.1002/bjs5.50174] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/18/2018] [Accepted: 03/20/2019] [Indexed: 01/17/2023] Open
Abstract
Background It is not known whether perioperative chemotherapy, compared with adjuvant chemotherapy alone, improves disease‐free survival (DFS) in patients with upfront resectable colorectal liver metastases (CLM). The aim of this study was to estimate the impact of neoadjuvant 5‐fluorouracil, leucovorin and oxaliplatin (FOLFOX) on DFS in patients with upfront resectable CLM. Methods Consecutive patients who presented with up to five resectable CLM at two Japanese and two French centres in 2008–2015 were included in the study. Both French institutions favoured perioperative FOLFOX, whereas the two Japanese groups systematically preferred upfront surgery plus adjuvant chemotherapy. Inverse probability of treatment weighting (IPTW) and Cox regression multivariable models were used to adjust for confounding. The primary outcome was DFS. Results Some 300 patients were included: 151 received perioperative chemotherapy and 149 had upfront surgery plus adjuvant chemotherapy. The weighted 3‐year DFS rate was 33·5 per cent after perioperative chemotherapy compared with 27·1 per cent after upfront surgery plus adjuvant chemotherapy (hazard ratio (HR) 0·85, 95 per cent c.i. 0·62 to 1·16; P = 0·318). For the subgroup of 165 patients who received adjuvant FOLFOX successfully (for at least 3 months), the adjusted effect of neoadjuvant chemotherapy was not significant (HR 1·19, 0·74 to 1·90; P = 0·476). No significant effect of neoadjuvant chemotherapy was observed in multivariable regression analysis. Conclusion Compared with adjuvant chemotherapy, perioperative FOLFOX does not improve DFS in patients with resectable CLM, provided adjuvant chemotherapy is given successfully.
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Affiliation(s)
- M-A Allard
- Centre Hépatobiliaire Paul Brousse Hospital, Université Paris Sud Villejuif France
| | - Y Nishioka
- Hepato-Biliary-Pancreatic Surgery Division, Department of Surgery, Graduate School of Medicine University of Tokyo Tokyo Japan
| | - N Beghdadi
- Centre Hépatobiliaire Paul Brousse Hospital, Université Paris Sud Villejuif France
| | - K Imai
- Department of Gastroenterological Surgery, Graduate School of Medical Sciences Kumamoto University Kumamoto Japan
| | - M Gelli
- Department of Oncological Surgery Gustave Roussy Villejuif France
| | - S Yamashita
- Hepato-Biliary-Pancreatic Surgery Division, Department of Surgery, Graduate School of Medicine University of Tokyo Tokyo Japan
| | - Y Kitano
- Department of Gastroenterological Surgery, Graduate School of Medical Sciences Kumamoto University Kumamoto Japan
| | - T Kokudo
- Hepato-Biliary-Pancreatic Surgery Division, Department of Surgery, Graduate School of Medicine University of Tokyo Tokyo Japan
| | - Y-I Yamashita
- Department of Gastroenterological Surgery, Graduate School of Medical Sciences Kumamoto University Kumamoto Japan
| | - A Sa Cunha
- Centre Hépatobiliaire Paul Brousse Hospital, Université Paris Sud Villejuif France
| | - E Vibert
- Centre Hépatobiliaire Paul Brousse Hospital, Université Paris Sud Villejuif France
| | - D Elias
- Department of Oncological Surgery Gustave Roussy Villejuif France
| | - D Cherqui
- Centre Hépatobiliaire Paul Brousse Hospital, Université Paris Sud Villejuif France
| | - D Goere
- Department of Oncological Surgery Gustave Roussy Villejuif France
| | - R Adam
- Centre Hépatobiliaire Paul Brousse Hospital, Université Paris Sud Villejuif France
| | - H Baba
- Department of Gastroenterological Surgery, Graduate School of Medical Sciences Kumamoto University Kumamoto Japan
| | - K Hasegawa
- Hepato-Biliary-Pancreatic Surgery Division, Department of Surgery, Graduate School of Medicine University of Tokyo Tokyo Japan
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Kitano Y, Wakimoto S, Tamura S, Kubota K, Domon Y, Arakawa N, Saito M, Sava B, Buisson B. Effects of mirogabalin, a novel ligand for the α₂δ subunit of voltage-gated calcium channels, on N-type calcium channel currents of rat dorsal root ganglion culture neurons. Pharmazie 2019; 74:147-149. [PMID: 30961679 DOI: 10.1691/ph.2019.8833] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Subscribe] [Scholar Register] [Indexed: 09/29/2022]
Abstract
Mirogabalin, which is a novel ligand for the α₂δ subunit of voltage-gated calcium channels, is being developed for treating neuropathic pain including diabetic peripheral neuropathy and postherpetic neuralgia. Mirogabalin possesses unique α₂δ subunit binding characteristics and has potent and long-lasting analgesic effects in neuropathic pain models. In the present study, we investigated the effects of mirogabalin on N-type calcium channel currents of the rat dorsal root ganglion (DRG) culture neurons using the whole-cell patch clamp technique. Small or medium DRG neurons were isolated from Sprague-Dawley rats and were incubated for 20 to 24 h with mirogabalin or pregabalin. The DRG neurons were depolarised from a holding potential of -40 mV to +40 mV in steps of 10 mV for 220 ms, and elicited N-type calcium channel currents were recorded. The N-type calcium channel currents were verified by sensitivity to ω-conotoxin GVIA, a selective N-type calcium channel blocker. Mirogabalin inhibited the calcium channel currents of rat DRG neurons at 50 μM, and pregabalin inhibited them at 200 μM. Mirogabalin and pregabalin showed significant differences in the peak current densities at depolarisation to -20 and -10 mV when compared with that shown by the vehicle control. In conclusion, mirogabalin inhibits N-type calcium channel currents in rat DRG culture neurons. The potent and long-lasting analgesic effects of mirogabalin are thought to be associated with its potent and selective binding to α₂δ-1 subunits and following functional inhibition of calcium channel currents.
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Domon Y, Kitano Y, Makino M. Analgesic effects of the novel α₂δ ligand mirogabalin in a rat model of spinal cord injury. Pharmazie 2019; 73:659-661. [PMID: 30396385 DOI: 10.1691/ph.2018.8550] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Subscribe] [Scholar Register] [Indexed: 09/29/2022]
Abstract
Mirogabalin, which is a novel ligand for the α₂δ subunit of voltage-gated calcium channels, is under development for the treatment of pain associated with diabetic peripheral neuropathy and postherpetic neuralgia. Mirogabalin possesses unique binding characteristics to α₂δ subunits and potent and long-lasting analgesic effects in peripheral neuropathic pain models. In the present study, we investigated the analgesic effects of mirogabalin in a rat model of spinal cord injury as an experimental animal model for central neuropathic pain. The spinal cord injury model was established by acute compression of the spinal cord at the T6/7 level with a microvascular clip in male rats. Twenty-eight days after spinal cord injury, the animals received the test compound orally, and the paw withdrawal threshold to mechanical stimulation was determined using the von Frey test at 0 (before administration), 2, 4, 6, 8, and 24 h after administration. The area under the curve of the paw withdrawal threshold (paw withdrawal threshold AUC) was also calculated. In rats subjected to spinal cord injury, mechanical allodynia was demonstrated by a decreased paw withdrawal threshold. A single oral administration of mirogabalin (2.5, 5, or 10 mg/kg) significantly increased the paw withdrawal threshold. The effects of mirogabalin were still significant 6 or 8 h after administration. The paw withdrawal threshold AUC was significantly higher in the treated animals than in the control group. In conclusion, mirogabalin showed potent and long-lasting analgesic effects in a rat model of spinal cord injury and may therefore provide effective pain relief for patients with central neuropathic pain.
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Teraoka S, Sugawara M, Kitano Y, Hoshino T, Takahashi M, Minagawa Y, Naganuma S, Sanaka T, Mineshima M, Era K, Honda H, Fuchinoue S, Agishi T, Ota K. Microscopic Observation of Leukocyte Kinesis in the Vascular Bed during Hemodialysis Using the Rabbit Ear Chamber Technique. Int J Artif Organs 2018. [DOI: 10.1177/039139888901200405] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
Leukocyte kinesis in the capillary vascular bed during hemodialysis (HD) was investigated to elucidate the mechanism of transient leukopenia. Leukocyte movement was observed microscopically during HD using the rabbit ear chamber (REC) technique, which permits visualization of the movement of blood corpuscles in capillaries. Blood was drawn from the femoral artery and returned into the auricular and/or carotid artery so that the blood passing through the hollow fiber artificial kidney (HFAK) flowed into capillaries in the REC. Leukocyte counts of blood samples taken from the afferent and efferent limbs of the HD circuit, the right jugular vein and the right atrium were determined consecutively during HD. The difference in the leukocyte count was observed between the afferent and efferent limbs for the first 15 minutes and thereafter between the efferent limb and the jugular vein. The “transpulmonary” difference in the leukocyte count was not noticed throughout HD. Between 15 and 90 minutes after the start of HD, scarcely any circulating leukocytes were found in capillaries in the REC and some leukocytes were attached to the endothelial surface. Thereafter circulating leukocytes were seen again and detachment of leukocytes from the endothelial surface was observed. No leukocyte aggregation or embolization of aggregating leukocytes was noticed. This evidence suggests that leukopenia may be attributed to the transient shift of leukocytes to the marginal pool of the vessel lumen and this process may not be specific for the pulmonary vasculature, but may occur in the first capillary bed into which the blood passing through the HFAK flows. The attachment of leukocytes to the surface membrane of the HFAK may contribute to the transient leukopenia especially during the initial period of the HD.
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Affiliation(s)
- S. Teraoka
- Kidney Center, Tokyo Women's Medical College, Tokyo - Japan
| | - M. Sugawara
- Department of Surgical Science, Tokyo Women's Medical College, Tokyo - Japan
| | - Y. Kitano
- Kidney Center, Tokyo Women's Medical College, Tokyo - Japan
| | - T. Hoshino
- Kidney Center, Tokyo Women's Medical College, Tokyo - Japan
| | - M. Takahashi
- Kidney Center, Tokyo Women's Medical College, Tokyo - Japan
| | - Y. Minagawa
- Kidney Center, Tokyo Women's Medical College, Tokyo - Japan
| | - S. Naganuma
- Kidney Center, Tokyo Women's Medical College, Tokyo - Japan
| | - T. Sanaka
- Kidney Center, Tokyo Women's Medical College, Tokyo - Japan
| | - M. Mineshima
- Kidney Center, Tokyo Women's Medical College, Tokyo - Japan
| | - K. Era
- Kidney Center, Tokyo Women's Medical College, Tokyo - Japan
| | - H. Honda
- Kidney Center, Tokyo Women's Medical College, Tokyo - Japan
| | - S. Fuchinoue
- Kidney Center, Tokyo Women's Medical College, Tokyo - Japan
| | - T. Agishi
- Kidney Center, Tokyo Women's Medical College, Tokyo - Japan
| | - K. Ota
- Kidney Center, Tokyo Women's Medical College, Tokyo - Japan
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Miyata T, Yamashita Y, Yamao T, Umezaki N, Tsukamoto M, Kitano Y, Yamamura K, Arima K, Kaida T, Nakagawa S, Imai K, Hashimoto D, Chikamoto A, Ishiko T, Asato T, Mikami Y, Aishima S, Baba H. Hepatobiliary and Pancreatic: Hepatocellular carcinoma developed with angiomyolipoma. J Gastroenterol Hepatol 2017; 32:547. [PMID: 28320064 DOI: 10.1111/jgh.13655] [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] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/24/2016] [Accepted: 11/12/2016] [Indexed: 12/09/2022]
Affiliation(s)
- T Miyata
- Department of Gastroenterological Surgery, Graduate School of life Sciences, Kumamoto University, Kumamoto, Japan
| | - Y Yamashita
- Department of Gastroenterological Surgery, Graduate School of life Sciences, Kumamoto University, Kumamoto, Japan
| | - T Yamao
- Department of Gastroenterological Surgery, Graduate School of life Sciences, Kumamoto University, Kumamoto, Japan
| | - N Umezaki
- Department of Gastroenterological Surgery, Graduate School of life Sciences, Kumamoto University, Kumamoto, Japan
| | - M Tsukamoto
- Department of Gastroenterological Surgery, Graduate School of life Sciences, Kumamoto University, Kumamoto, Japan
| | - Y Kitano
- Department of Gastroenterological Surgery, Graduate School of life Sciences, Kumamoto University, Kumamoto, Japan
| | - K Yamamura
- Department of Gastroenterological Surgery, Graduate School of life Sciences, Kumamoto University, Kumamoto, Japan
| | - K Arima
- Department of Gastroenterological Surgery, Graduate School of life Sciences, Kumamoto University, Kumamoto, Japan
| | - T Kaida
- Department of Gastroenterological Surgery, Graduate School of life Sciences, Kumamoto University, Kumamoto, Japan
| | - S Nakagawa
- Department of Gastroenterological Surgery, Graduate School of life Sciences, Kumamoto University, Kumamoto, Japan
| | - K Imai
- Department of Gastroenterological Surgery, Graduate School of life Sciences, Kumamoto University, Kumamoto, Japan
| | - D Hashimoto
- Department of Gastroenterological Surgery, Graduate School of life Sciences, Kumamoto University, Kumamoto, Japan
| | - A Chikamoto
- Department of Gastroenterological Surgery, Graduate School of life Sciences, Kumamoto University, Kumamoto, Japan
| | - T Ishiko
- Department of Gastroenterological Surgery, Graduate School of life Sciences, Kumamoto University, Kumamoto, Japan
| | - T Asato
- Department of Diagnostic Pathology, Kumamoto University Hospital, Kumamoto, Japan
| | - Y Mikami
- Department of Diagnostic Pathology, Kumamoto University Hospital, Kumamoto, Japan
| | - S Aishima
- Department of Pathology and Microbiology, Faculty of Medicine, Saga University, Saga, Japan
| | - H Baba
- Department of Gastroenterological Surgery, Graduate School of life Sciences, Kumamoto University, Kumamoto, Japan
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Arima K, Ishimoto T, Ohmuraya M, Okabe H, Kitano Y, Yamamura K, Kaida T, Nakagawa S, Imai K, Hashimoto D, Chikamoto A, Yamashita YI, Baba H. 20P Verification of mechanism that CSC markers are implicated in poor prognosis for pancreatic ductal adenocarcinoma. Ann Oncol 2016. [DOI: 10.1093/annonc/mdw573.019] [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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Arima K, Ishimoto T, Ohmuraya M, Okabe H, Kitano Y, Yamamura K, Kaida T, Nakagawa S, Imai K, Hashimoto D, Chikamoto A, Yamashita YI, Baba H. 20P Verification of mechanism that CSC markers are implicated in poor prognosis for pancreatic ductal adenocarcinoma. Ann Oncol 2016. [DOI: 10.1016/s0923-7534(21)00182-4] [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: 10/22/2022] Open
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Affiliation(s)
- N Yoshikawa
- Department of Pediatrics, Kobe University Hospital, Japan
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Kitano Y, Nagase N, Okada N, Okano M. Cinemicrographic study of cell proliferation pattern and interdivision times of human keratinocytes in primary culture. Curr Probl Dermatol 2015; 11:97-108. [PMID: 6197252 DOI: 10.1159/000408667] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
Abstract
The stratified squamous epithelium of the skin, the epidermis, is a renewing cell population. In order for epidermis to remain the same size, each dividing basal cell must produce on an average, one daughter cell that will remain as a germinative cell and another that will perform terminal differentiation (differential mitosis). In order to investigate cell kinetics in the epidermis, the information obtained from in vivo study is limited, and offers only indirect evidence for the determination of cell cycle time and cell proliferation pattern. Keratinocytes in cell culture are unique in formation of a multilayered cellular sheet in which the keratinocytes form a structure resembling the epidermis in vivo, and keratinize at the top. In the early days of the primary culture of human keratinocytes, when the cells proliferate to form a monolayer sheet, direct access to cell proliferation pattern and measurement of interdivision time can be done using techniques of time-lapse cinemicrography. The primary cultures at 8-20 days of incubation were employed for cinemicrographic observation when small polygonal cells appeared in groups, when numerous mitotic figures were observed, and when stratification of the cells had not yet occurred. The appropriate field was marked and followed for up to 6 days. Photographic prints were made from the 16 mm cine film, and dendrograms were made and analyzed for pattern of cell proliferation and interdivision time. Most cells in the field divided two or three times during the period of observation. Sister-sister pairs of the second and third generations divided after approximately the same interdivision times. However, some cells have never divided. Some of the sister-sister pairs differed considerably in their interdivision times. In some cultures synchronous division was quite evident. The average interdivision time was about 26 hr in the majority of cultures, and it is suggested that the estimated long cell cycle time in vivo might be overestimated due to the existence of non-cycling cells in the germinative population.
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Kitano Y, Okada N. Keratinization of human keratinocytes in cell culture: the effect of cyclic AMP. Curr Probl Dermatol 2015; 10:27-37. [PMID: 6165522 DOI: 10.1159/000396280] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
Abstract
Human keratinocytes in culture were treated with dibutyryl cyclic AMP (DBcAMP) at concentrations of 10(-3) and 10(-4) M, and labeled with [3H]histidine for 48 hours. The proteins of the keratinocytes were serially extracted in 0.25 M sucrose, 0.1 M sodium citrate-citric acid (pH 2.6), 6 M urea-0.1 M Tris-HCl(pH 9.0), and 6 M urea-0.1 M Tris-HCl(pH 9.0) with 1% mercaptoethanol. The incorporation of [3H]histidine into the extract as assayed by DPM of 3H/microgram protein was increased in 0.25 M sucrose extract and Tris-urea extract of the cultures treated with 10(-3) M and 10(-4) M DBcAMP as compared with the control culture. There was no difference between the citrate-buffer extract of the control and that of the DBcAMP-treated cultures. The incorporation of [3H]histidine into the Tris-urea-mercaptoethanol extract was small, and this fraction was thought to be inactive metabolically. It was concluded that dibutyryl cycli AMP stimulated the protein synthesis of the cultured keratinocytes and induced a qualitative change toward accelerating the synthesis of keratinous protein.
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Kitano Y, Okuyama H, Saito M, Usui N, Morikawa N, Masumoto K, Takayasu H, Nakamura T, Ishikawa H, Kawataki M, Hayashi S, Inamura N, Nose K, Sago H. Re-evaluation of stomach position as a simple prognostic factor in fetal left congenital diaphragmatic hernia: a multicenter survey in Japan. Ultrasound Obstet Gynecol 2011; 37:277-282. [PMID: 21337653 DOI: 10.1002/uog.8892] [Citation(s) in RCA: 86] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/30/2023]
Abstract
OBJECTIVES To document outcome and to explore prognostic factors in fetal left congenital diaphragmatic hernia (CDH). METHODS This was a multicenter retrospective study of 109 patients with prenatally diagnosed isolated left CDH born between 2002 and 2007. The primary outcome was intact discharge, defined as discharge from hospital without major morbidities, such as a need for respiratory support including oxygen supplementation, tube feeding, parenteral nutrition or vasodilators. All patients were managed at perinatal centers with immediate resuscitation, gentle ventilation (mostly with high-frequency oscillatory ventilation) and surgery after stabilization. Prenatal data collected included liver and stomach position, lung-to-head ratio, gestational age at diagnosis and presence or absence of polyhydramnios. Stomach position was classified into four grades: Grade 0, abdominal; Grade 1, left thoracic; Grade 2, less than half of the stomach herniated into the right chest; and Grade 3, more than half of the stomach herniated into the right chest. RESULTS Overall intact discharge and 90-day survival rates were 65.1% and 79.8%, respectively. Stomach herniation was classified as Grade 0 in 19.3% of cases, Grade 1 in 45.9%, Grade 2 in 13.8% and Grade 3 in 21.1%. Multivariate analysis revealed that liver position was the strongest prognostic variable for intact discharge, followed by stomach position. Based on our results, we divided patients into three groups according to liver (up vs. down) and stomach (Grade 0-2 vs. Grade 3) position. Intact discharge rates declined significantly from liver-down (Group I), to liver-up with stomach Grade 0-2 (Group II), to liver-up with stomach Grade 3 (Group III) (87.0%, 47.4% and 9.5% of cases, respectively). CONCLUSION Current status and outcomes of prenatally diagnosed left CDH in Japan were surveyed. Stomach herniation into the right chest was not uncommon and its grade correlated with outcome. The combination of liver and stomach positions was useful to stratify patients into three groups (Group I-III) with different prognoses.
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Affiliation(s)
- Y Kitano
- Division of Surgery, National Center for Child Health and Development, Tokyo, Japan.
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Tsurusawa R, Kitano Y, Shirotani G, Hayashi H, Kawatani E, Ishii A, Hirose S, Ogawa A. P16-23 A case of tuberous sclerosis complex with left centro-parietal sharp waves preceding hypsarrhythmia. Clin Neurophysiol 2010. [DOI: 10.1016/s1388-2457(10)60830-9] [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: 10/18/2022]
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Ishimaru T, Uchida H, Yotsumoto K, Gotoh C, Yoshida M, Oguma E, Kishimoto H, Iwanaka T, Kitano Y. Recurrence of a congenital pancreatic cyst mimicking omental cyst after laparoscopic cyst resection. Eur J Pediatr Surg 2009; 19:53-4. [PMID: 19221953 DOI: 10.1055/s-2008-1038590] [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] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
Affiliation(s)
- T Ishimaru
- Department of Pediatric Surgery, Saitama Children's Medical Center, Saitama, Japan
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Sato R, Watari J, Tanabe H, Fujiya M, Ueno N, Konno Y, Ishikawa C, Ito T, Moriichi K, Okamoto K, Maemoto A, Chisaka K, Kitano Y, Matsumoto K, Ashida T, Kono T, Kohgo Y. Transnasal ultrathin endoscopy for placement of a long intestinal tube in patients with intestinal obstruction. Gastrointest Endosc 2008; 67:953-7. [PMID: 18440385 DOI: 10.1016/j.gie.2008.01.043] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/20/2007] [Accepted: 01/22/2008] [Indexed: 12/23/2022]
Abstract
BACKGROUND The technical difficulties related to the insertion of a long intestinal tube into the jejunum under fluoroscopy present a considerable problem in patients with an intestinal obstruction. OBJECTIVE To evaluate the usefulness of endoscopic long intestinal-tube placement with the ultrathin esophagogastroduodenoscope (UT-EGD). DESIGN A prospective randomized clinical trial was conducted. PATIENTS Twenty-eight consecutive patients who presented with an intestinal obstruction were included in the study. INTERVENTION The UT-EGD was inserted nasally into at least the second portion of the duodenum or beyond. After a guidewire was introduced through the working channel, with fluoroscopic guidance, the UT-EGD itself was carefully removed with the guidewire left in place. Next, a hydrophilic intestinal tube was advanced over the guidewire into the jejunum, and then the guidewire was removed. MAIN OUTCOME MEASUREMENTS Primary end points are the total procedure time, the radiation exposure time, and the rate of complications, all compared with the conventional method. RESULTS The mean (+/-SD) total procedure time was 18.7 +/- 8.4 minutes for the UT-EGD method and 39.5 +/- 15.0 minutes for the conventional method, with a significant time difference between the 2 methods (P < .0005). The mean (+/-SD) radiation exposure time was also shorter with the UT-EGD method (11.1 +/- 6.0 minutes) than with the conventional method (30.3 +/- 13.7 minutes) (P < .0005). There were no complications, except for mild nasal bleeding with each method. CONCLUSIONS The UT-EGD method has definite advantages in the placement of a long intestinal tube for patients with an intestinal obstruction in comparison with the conventional method.
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Affiliation(s)
- Ryu Sato
- Division of Endoscopy, Asahikawa Medical College, Asahikawa, Japan
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Kitano Y, Matsumoto K, Chisaka K, Imazawa M, Takahashi K, Nakade Y, Okada M, Aso K, Yokoyama K, Yamamoto M, Yoshie M, Ogawa K, Haneda M. An autopsy case of autoimmune pancreatitis. JOP 2007; 8:621-7. [PMID: 17873471] [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] [Subscribe] [Scholar Register] [Indexed: 05/17/2023]
Abstract
CONTEXT Autoimmune pancreatitis is an increasingly recognized type of chronic pancreatitis, but little is known about the long-term outcome of the disease. CASE REPORT We report an autopsy case of autoimmune pancreatitis. The patient was an 81-year-old Japanese male. He was referred to our department with jaundice in February 1996. ERCP images revealed a severe stricture of the lower part of the common bile duct and irregular narrowing of the main pancreatic duct. A diagnosis of extrahepatic cholangiocarcinoma was made and endoscopic biliary drainage was performed. A stricture of the common bile duct and narrowing of the pancreatic duct had improved on ERCP images when a follow-up examination was performed in November 1998. He was followed up for chronic pancreatitis. The serum IgG and IgG4 levels were increased on serological examination. He died of interstitial pneumonia and congestive heart failure in May 2003. At the autopsy examination, fibrosis was found in the periductal, interlobular and intralobular parts of the pancreas. Focal atrophy of the acinar cells was also identified. There was little infiltration of inflammatory cells into the parenchyma or the stroma of the pancreas. These pathological findings were similar to those of 'conventional' chronic pancreatitis. CONCLUSION We present an autopsy case of autoimmune pancreatitis which is a rare finding.
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Affiliation(s)
- Yohei Kitano
- Second Department of Medicine, Asahikawa Medical College, Asahikawa, Japan.
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Hayashi S, Sago H, Kitano Y, Kuroda T, Honna T, Nakamura T, Ito Y, Kitagawa M, Natori M. Fetal pleuroamniotic shunting for bronchopulmonary sequestration with hydrops. Ultrasound Obstet Gynecol 2006; 28:963-7. [PMID: 17086582 DOI: 10.1002/uog.3861] [Citation(s) in RCA: 13] [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] [Subscribe] [Scholar Register] [Indexed: 05/12/2023]
Abstract
Bronchopulmonary sequestration (BPS), a non-functional pulmonary tissue mass, when complicated by fetal hydrops, carries a high risk of perinatal mortality. However, a limited number of cases of BPS complicated by fetal hydrops with an informative clinical course have been reported. We report here on three cases of BPS complicated by fetal hydrothorax and hydrops that were successfully treated by pleuroamniotic shunting, which should be considered as a treatment option for fetal hydrothorax and hydrops associated with BPS.
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Affiliation(s)
- S Hayashi
- Division of Fetal Medicine, National Center for Child Health and Development, Japan
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25
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Abstract
The marine sponge Acanthella cavernosa and nudibranchs of the family Phyllidiidae contain isocyanoterpenoids and their related compounds that show potent antifouling activity against cypris larvae of the barnacle Balanus amphitrite, while their toxicity to cyprids is weak. To develop non-toxic antifoulants based on isocyanoterpenoids, especially 3-isocyanotheonellin, a total of 36 isocyano compounds have been synthesized. They were evaluated by both antifouling activity and toxicity toward B. amphitrite cyprids, which led some insight into the structure-activity relationships. Since linear alkyl isocyanides showed antifouling activity at nontoxic concentrations, a large amount of 1,1-dimethyl-10-undecyl isocyanide was synthesized, incorporated into paints, and tested for antifouling activity in the field with promising results. Therefore, isocyano compounds were considered as candidate non-toxic antifouling agents.
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Affiliation(s)
- Y Nogata
- Environmental Science Research Laboratory, Central Research Institute of Electric Power Industry, 1646 Abiko, Abiko-shi, Chiba-ken 270-1194, Japan
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26
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Hayashi S, Sago H, Kashima K, Kitano Y, Kuroda T, Honna T, Nosaka S, Nakamura T, Ito Y, Kitagawa M, Natori M. Prenatal diagnosis of fetal hydrometrocolpos secondary to a cloacal anomaly by magnetic resonance imaging. Ultrasound Obstet Gynecol 2005; 26:577-9. [PMID: 16184505 DOI: 10.1002/uog.2584] [Citation(s) in RCA: 32] [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] [Subscribe] [Scholar Register] [Indexed: 05/04/2023]
Abstract
Fetal female urogenital anomalies are often difficult to evaluate by ultrasonography, especially in late gestation. We report a case of fetal hydrometrocolpos detected at 35 weeks of gestation. Ultrasonography revealed a large retrovesical septate hypoechogenic mass in the fetal abdomen, however the sonographic findings were inconclusive. Magnetic resonance imaging (MRI) confirmed that the abdominal mass was fluid-filled with a mid-plane septum in the midline posterior to the bladder, and showed a connection to the dilated uterus that was duplicated. These findings were consistent with a diagnosis of hydrometrocolpos with septate vagina and uterus didelphys. The neonate showed abdominal distension, ambiguous genitalia and anal atresia with a single perineal opening. Hydrometrocolpos was secondary to a urethral type of cloacal anomaly. Aspiration of the mass and a colostomy were performed on the first postnatal day, followed by anorectoplasty at 19 months of age. MRI is a useful complementary tool for assessing fetal urogenital anomalies when ultrasonography is inconclusive.
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Affiliation(s)
- S Hayashi
- Division of Fetal Medicine, National Center for Child Health and Development, Tokyo, Japan
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27
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Tanaka K, Honna T, Kitano Y, Kuroda T, Tanaka K, Morikawa N, Matsuda H, Kawashima N, Matsuoka K, Miyauchi J. Combined fibrolamellar carcinoma and cholangiocarcinoma exhibiting biphenotypic antigen expression: a case report. J Clin Pathol 2005; 58:884-7. [PMID: 16049296 PMCID: PMC1770866 DOI: 10.1136/jcp.2004.021956] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.4] [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: 01/05/2023]
Abstract
Fibrolamellar carcinoma (FLC), a variant of hepatocellular carcinoma (HCC), very rarely occurs in association with cholangiocarcinoma (CC). This report describes the first case of FLC coexisting with CC (FLC-CC) from Japan. Although the major part of the tumour located in the right lobe of the liver showed the typical features of FLC, CC was admixed with the FLC, not only in the primary hepatic tumour, but also in the lymph node metastases. Immunohistochemical analysis revealed that, although carcinoembryonic antigen (CEA), which can be detected with monoclonal antibodies in the cytoplasm and the cell surface of CC cells but not HCC cells, was expressed in only the CC cells in the primary tumour, it was expressed extensively in the cytoplasm of both CC and FLC cells in the metastatic and recurrent tumours. Furthermore, Hep Par 1, a hepatocyte specific antigen, was also expressed in both the FLC and CC cells. These findings suggest that, in this case, both FLC and CC were possibly derived from the same cancer stem cell with the capacity to differentiate into both hepatocytes and bile duct epithelium, and that both the cellular components, therefore, exhibited biphenotypic antigen expression.
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Affiliation(s)
- K Tanaka
- Department of Surgery, National Centre for Child Health and Development, 2-10-1 Okura, Setagaya-ku, Tokyo 157-8535, Japan
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28
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Asano T, Hanazono Y, Sasaki K, Ueda Y, Hasegawa M, Ageyama N, Terao K, Kitano Y, Momoeda M, Ozawa K, Harii K. 047
Allogeneic Transplantation of Genetically Modified Primate Embryonic Stem Cells. Wound Repair Regen 2004. [DOI: 10.1111/j.1067-1927.2004.abstractbi.x] [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: 11/28/2022]
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29
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Okazaki M, Yoshimura K, Suzuki Y, Uchida G, Kitano Y, Harii K, Imokawa G. The mechanism of epidermal hyperpigmentation in café-au-lait macules of neurofibromatosis type 1 (von Recklinghausen's disease) may be associated with dermal fibroblast-derived stem cell factor and hepatocyte growth factor. Br J Dermatol 2003; 148:689-97. [PMID: 12752125 DOI: 10.1046/j.1365-2133.2003.05283.x] [Citation(s) in RCA: 56] [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] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
BACKGROUND The mechanism of the accentuated melanization in café-au-lait macules (CALMs) in patients with neurofibromatosis type 1 (NF1; von Recklinghausen's disease) has not been elucidated. OBJECTIVES To clarify the mechanism involved in the hyperpigmentation of CALMs in NF1. METHODS Using enzyme-linked immunosorbent assay (ELISA) and reverse transcriptase-polymerase chain reaction (RT-PCR) analysis of cultured cells, we measured the levels of cytokines produced and secreted by keratinocytes and fibroblasts derived from CALMs (group RC: Recklinghausen CALM) skin, compared with cells derived from the skin of normal individuals (group NN: Normal skin of Normal individuals) and cells derived from non-CALM skin of NF1 patients (group RN: Recklinghausen Non-CALM). RESULTS ELISA revealed that the secretion of hepatocyte growth factor (HGF) and stem cell factor (SCF) by cultured fibroblasts was significantly elevated in group RC compared with groups RN and NN. In parallel, semiquantitative real-time RT-PCR of HGF and SCF mRNAs demonstrated increased expression of both types of transcripts by cultured fibroblasts in group RC compared with group NN. In contrast, the secretion of endothelin-1 and granulocyte/macrophage colony-stimulating factor by cultured keratinocytes occurred at a similar level among all three groups, RC, RN and NN. CONCLUSIONS These findings suggest that increased secretion of HGF and SCF by dermal fibroblasts may be associated with the accentuated epidermal melanization observed in CALMs in the skin of NF1 patients.
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Affiliation(s)
- M Okazaki
- Department of Plastic and Reconstructive Surgery, Graduate School of Medicine, University of Tokyo 7-3-1, Hongo, Tokyo 3-86SS, Japan
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30
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Naito A, Kitano Y, Iida M, Ishida K, Sakai M, Koga K. Study on the effect of the number of electrodes programmed and the area of stimulation in cochlear implant patients. Adv Otorhinolaryngol 2002; 57:412-6. [PMID: 11892204 DOI: 10.1159/000059194] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Affiliation(s)
- A Naito
- Department of Otolaryngology, Tokai University School of Medicine, Japan
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31
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Sakai M, Ishida K, Naito A, Kitano Y. A case of CSF gusher in Mondini deformity of the inner ear. Adv Otorhinolaryngol 2002; 57:180-2. [PMID: 11892142 DOI: 10.1159/000059227] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/24/2023]
Affiliation(s)
- M Sakai
- Department of ORL, Chigasaki Central Hospital, Chigasaki, Japan
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32
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Kitano Y, Yokoyama K, Matsumoto K, Makino I, Tanaka H. Amelioration of cerulein-induced acute pancreatitis by 2,2'-dipyridyl in rats. Hokkaido Igaku Zasshi 2002; 77:161-7. [PMID: 11968852] [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] [Subscribe] [Scholar Register] [Indexed: 02/24/2023]
Abstract
We studied the effect of iron chelators, 2,2'-dipyridyl and desferrioxamine, on cerulein-induced pancreatitis in rats. Acute pancreatitis was induced by a single subcutaneous injection of 100 micrograms/kg body weight of cerulein, which caused hyperamylasemia and edematous pancreatitis with neutrophilic infiltration. Blood samples were collected for determination of serum amylase values and the pancreas was removed for the histological examination 6 h after the cerulein injection. Intraperitoneal administration of a ferrous iron chelator, 2,2'-dipyridyl, prior to the cerulein injection resulted in amelioration of hyperamylasemia and histological abnormalities such as edema and inflammation but not of acinar cell vacuolization. In contrast, administration of a ferric iron chelator, desferrioxamine, did not show any beneficial effects. These results indicate that administration of 2,2'-dipyridyl ameliorates the pancreatitis induced by the supramaximal dose of cerulein.
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Affiliation(s)
- Yohei Kitano
- Second Department of Internal Medicine, Asahikawa Medical College, Asahikawa 078-8510, Japan
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33
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Mori K, Ikeda K, Hayashida S, Tokieda K, Ishimoto H, Fujii Y, Fukuzawa R, Kitano Y. Pulmonary epithelial cell maturation in hyperplastic lungs associated with fetal tracheal agenesis. J Pediatr Surg 2001; 36:1845-8. [PMID: 11733921 DOI: 10.1053/jpsu.2001.28862] [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] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Abstract
BACKGROUND/PURPOSE Cellular differentiation of pulmonary hyperplasia has not been reported in human cases. The authors studied surfactant protein expression and ultrastructure of pulmonary epithelial cells in fetal hyperplastic lungs associated with congenital tracheal agenesis. METHODS The maturation of pulmonary epithelial cells was assessed by immunohistochemical examination for surfactant proteins (SP-A, mature SP-B, proSP-B, proSP-C, and SP-D) and transmission electron microscopy. As controls normal lung portions of 8 fetuses born at 21 weeks gestation were used. RESULTS Mature SP-B and SP-D was detected in terminal airways in this case, but not in controls. In electron microscopy, lamellar bodies were recognized, and glycogen granules were less abundant in terminal airway cells. CONCLUSION The differentiation of pulmonary epithelial cells appeared to be more advanced for the gestational age in pulmonary hyperplasia with congenital tracheal agenesis. J Pediatr Surg 36:1845-1848.
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Affiliation(s)
- K Mori
- Division of Neonatology, Department of Pediatrics, Keio University School of Medicine, Tokyo, Japan
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34
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Chiba K, Miura T, Kim S, Kitano Y, Tada M. Electrocatalytic intermolecular olefin cross-coupling by anodically induced formal [2+2] cycloaddition between enol ethers and alkenes. J Am Chem Soc 2001; 123:11314-5. [PMID: 11697984 DOI: 10.1021/ja016885b] [Citation(s) in RCA: 81] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- K Chiba
- Laboratory of Bio-organic Chemistry, Tokyo University of Agriculture and Technology, 3-5-8 Saiwai-cho, Fuchu, Tokyo 183-8509, Japan
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Kitano Y, Niwano S, Yoshizawa N, Hara H, Moriguchi M, Izumi T. Clinical usefulness of the atrial double potential at the intercaval region in the right atrium: a new index for inducibility of atrial fibrillation in electrophysiologic studies. Jpn Heart J 2001; 42:713-23. [PMID: 11933921 DOI: 10.1536/jhj.42.713] [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] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
Abstract
The second deflection of the atrial double potential (DP) recorded at the intercaval region is considered to reflect the far-field potential of the left atrium. The conduction via the upper interatrial connection was evaluated utilizing this DP and the relationship between atrial fibrillation (AF) and the conduction via the interatrial connection evaluated. In 30 consecutive patients with the DP at the intercaval region, prolongation in the left atrial activation time during the right atrial extra stimulation was measured at the intercaval region (deltaDP) and the coronary sinus (deltaCS). The difference between deltaDP and deltaCS (deltaDP-deltaCS) was used as an index of inhomogeneity in interatrial conduction. The patients were divided into AF (n=13) and non-AF (n=17) groups in accordance with the inducibility of AF in the electrophysiologic study. The max deltaDP and the max ACS were greater in the AF group than in the non-AF group, i.e., max deltaDP (43+/-19 vs 27+/-17 ms, P=0.021), max deltaCS (35+/-15 vs 21+/-14 ms, P=0.029). The max absolute value(deltaDP-deltaCS) was also greater in t
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Affiliation(s)
- Y Kitano
- Department of Internal Medicine, Kitasato University School of Medicine, Sagamihara, Kanagawa, Japan
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36
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Kitano Y, Yoshimura K, Uchida G, Sato K, Harii K. Pretreatment with topical all-trans-retinoic acid is beneficial for wound healing in genetically diabetic mice. Arch Dermatol Res 2001; 293:515-21. [PMID: 11820728 DOI: 10.1007/pl00007466] [Citation(s) in RCA: 29] [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: 10/25/2022]
Abstract
OBJECTIVE Topical pretreatment with aIl-trans-retinoic acid (atRA) is known to improve healing of cutaneous wounds. We tested the effect of atRA on wound healing of genetically diabetic db/db mice. It is known that cutaneous wounds of db/db mice show delayed wound healing due to impaired wound contraction, delayed granulation tissue formation and underexpression of keratinocyte growth factor (KGF). METHODS 0.1% atRA in 100 mg aqueous gel was applied to the back skin of db/db mice as well as to their normal heterozygous littermates, db/+ mice, for five consecutive days, and 2 days after completion of the atRA treatment, two round excisional wounds were created down the panniculus carnosus with a 6-mm punch biopsy on the back skin of each mouse. RESULTS After 5 days treatment with 0.1% atRA, significant hypertrophy of the epidermis and dermis, neovascularization, and inflammatory cell invasion were seen in the skin of the db/db mice, but these effects were seen only weakly in db/+ mice. Wounds in atRA-treated db/db mice closed more rapidly than those in vehicle-treated db/db mice. KGF mRNA expression, which is usually significantly lower in db/db mice than in normal mice, in wounds of atRA-treated db/db mice on day 1 of treatment was as strong as in db/+ mice. CONCLUSION Pretreatment with atRA reversed the impaired wound healing in db/db mice.
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Affiliation(s)
- Y Kitano
- Department Plastic and Reconstructive Surgery, School of Medicine, University of Tokyo.
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37
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Yoshimura K, Tsukamoto K, Okazaki M, Virador VM, Lei TC, Suzuki Y, Uchida G, Kitano Y, Harii K. Effects of all-trans retinoic acid on melanogenesis in pigmented skin equivalents and monolayer culture of melanocytes. J Dermatol Sci 2001; 27 Suppl 1:S68-75. [PMID: 11514127 DOI: 10.1016/s0923-1811(01)00116-5] [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: 10/18/2022]
Abstract
The effects of all-trans retinoic acid (RA) on melanogenesis and the mechanism of its action in topical treatment have not been elucidated. The purpose of this study was to determine the effects of RA on melanogenesis in the pigmented skin equivalent as well as in monolayer culture of melanocytes, and to determine whether RA, hydroquinone (HQ), and hydrocortisone (HC) show synergistic depigmenting effects in combined treatments of each other. The suppressing effect of RA on melanogenesis was not observed in pigmented skin equivalents and monolayer culture of murine and human melanocytes, although HQ showed strong inhibition of melanogenesis. The synergistic effects between RA, HQ, and HC were not particularly seen. The results suggested that RA neither has direct inhibitory effects on melanogenesis of melanocytes, nor influences the cell-cell interactions between melanocytes, keratinocytes and fibroblasts, such as paracrine actions with regard to melanin production. The role of RA in bleaching treatments appears to be in other specific actions, such as promotion of keratinocytes proliferation and acceleration of epidermal turnover.
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Affiliation(s)
- K Yoshimura
- Department of Plastic and Reconstructive Surgery, Graduate School of Medicine, University of Tokyo, 7-3-1, Hongo, Bunkyo-Ku, 113-8655, Tokyo, Japan.
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38
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Yoshizawa N, Niwano S, Moriguchi M, Kitano Y, Inuo K, Saito J, Izumi T. Effect of procainamide on the postrepolarization refractoriness in cardiac muscle: evaluation using the block coupling interval in the artificial isthmus model in the canine right atrium. Pacing Clin Electrophysiol 2001; 24:1100-7. [PMID: 11475826 DOI: 10.1046/j.1460-9592.2001.01100.x] [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] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
The post-repolarization refractoriness (PRR) is an important factor to determine the conduction block in cardiac muscle. Recently, we proposed the block coupling interval (BCI) as an useful electrophysiological index for evaluating the PRR. In the present study, the effect of procainamide on PRR was evaluated using the BCI and the effective refractory period (ERP). In five beagle dogs, radiofrequency linear ablation was performed on the right atrial surface parallel to the AV groove, forming an artificial isthmus (8-10 mm width and 15-20 mm length). Bipolar recordings were performed in the isthmus at a resolution of 1.2 mm and single extrastimuli with eight basic drive trains were delivered to cause conduction blocks in the isthmus. When a conduction block occurred, the recorded coupling interval at the recording site just proximal to the site of block was defined as BCI. At the site of the block, the ERP and duration of the monophasic action potential (MAP) at each drive cycle length was measured. The PRR was calculated using two different formulas: (1) [ERP-MAP] and (2) [BCI-MAP]. Procainamide was administrated intravenously at a dose of 15 mg/kg after the control study and the whole study protocol was repeated. The site of the block in an individual dog was always the same. BCI, ERP, and MAP were all shortened in accordance with the shortening of the basic drive cycle length, and the BCI was always the longest, ERP the middle, and the MAP was the shortest. The administration of procainamide prolonged each parameter, but the order of BCI > ERP > MAP remained unchanged. The PRR calculated as [BCI-MAP] was prolonged from 15 +/- 10 ms to 29 +/- 8 ms by the administration of procainamide (P = 0.048), but [ERP-MAP] was unchanged (8 +/- 10 ms vs 8 +/- 4 ms). In the conduction block model in the canine right atrium, procainamide prolonged the [BCI-MAP], but did not change the [ERP-MAP]. The procainamide effect of prolonging the PRR might be expressed better by the change in the BCI than the ERP.
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Affiliation(s)
- N Yoshizawa
- Department of Internal Medicine, Kitasato University School of Medicine, 15-1 Kitasato 1, Sagamihara, 228-8555 Japan.
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Kanai M, Kitano Y, von Allmen D, Davies P, Adzick NS, Flake AW. Fetal tracheal occlusion in the rat model of nitrofen-induced congenital diaphragmatic hernia: tracheal occlusion reverses the arterial structural abnormality. J Pediatr Surg 2001; 36:839-45. [PMID: 11381408 DOI: 10.1053/jpsu.2001.23950] [Citation(s) in RCA: 44] [Impact Index Per Article: 1.9] [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: 11/11/2022]
Abstract
BACKGROUND/PURPOSE The high mortality rate of congenital diaphragmatic hernia (CDH) is ascribed generally to pulmonary hypoplasia and persistent pulmonary hypertension characterized by associated pulmonary arterial structural changes. Prenatal tracheal occlusion (TO) accelerates lung growth, but the effect of TO on pulmonary arterial structure in CDH has not been well defined. The authors hypothesized that TO could reverse the pulmonary arterial structural changes observed in CDH. To address this hypothesis, we utilized the nitrofen-induced rat model of CDH to examine the effect of TO on pulmonary arterial morphology of CDH lungs. METHODS Left-sided CDH was induced by administering 100 mg of nitrofen to pregnant Sprague-Dawley rats on day 9 of gestation. TO was performed on day 19, and the fetuses were harvested on day 21.5 of gestation. After the ductus arteriosus was ligated, the pulmonary arteries were injected with a barium-gelatin mixture, and the lungs were inflation fixed. Coronal sections of the lungs were stained with elastin van Gieson. External diameter (ED), internal diameter (ID), and medial and adventitial wall thickness of the pulmonary arteries were measured using a computer image analyzer, and the percent medial thickness (%MT) and adventitial thickness (%AT) were calculated. The lungs from nitrofen-exposed fetuses with left-sided CDH (CDH group), trachea-occluded left-sided CDH (CDH+TO group), non-CDH (non-CDH group), and normal fetuses (normal group) were compared. RESULTS The %MT was significantly increased in all sizes of arteries in CDH compared with non-CDH and normal groups (P < .01). Compared with the CDH group, the CDH+TO group had significantly reduced %MT in all sizes of arteries (P < .01), to values comparable or less than the non-CDH and normal groups. The %AT of the CDH group was significantly increased in larger arteries compared with non-CDH and normal control groups (P < .01). CDH+TO had significantly decreased %AT compared with CDH in both larger (P < .01), and smaller arteries (P < .05) and that was comparable with the non-CDH and normal control groups. CONCLUSIONS TO in hypoplastic CDH lung can reverse the pulmonary arterial structural changes that are seen in the nitrofen-induced fetal rat model of CDH. These data suggest that TO may reduce pulmonary vascular reactivity, and the risk of postnatal persistent pulmonary hypertension observed in human neonates with severe CDH. J Pediatr Surg 36:839-845.
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Affiliation(s)
- M Kanai
- Children's Institute of Surgical Science and The Center for Fetal Diagnosis and Treatment, The Children's Hospital of Philadelphia, PA 19104-4399, USA
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40
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Kanamori Y, Hashizume K, Kawarasaki H, Kitano Y, Sugiyama M, Tanaka Y. Single vaginal ectopic ureter and renal hypoplasia associated with urogenital sinus and abdominal muscular hypoplasia-a novel subtype of prune-belly syndrome in a female child? Urology 2001; 57:975. [PMID: 11337307 DOI: 10.1016/s0090-4295(01)00931-1] [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: 10/18/2022]
Abstract
We report a rare case that can be classified as prune-belly syndrome in a female. This patient came to our attention during the 19th week of gestation when massive ascites was found by ultrasound and the mother was transferred to our hospital. After birth, it was demonstrated that the infant had complicated anomalies, including abdominal muscular hypoplasia, urogenital sinus, a single, right-sided vaginal ectopic ureter, and hypoplasia of the right kidney. A sibling had a right hypoplastic kidney and right vesicoureteral reflux. Considering the combination of anomalies and the family history of urinary tract disease, her anomalies could be attributed to a genetic mutation.
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Affiliation(s)
- Y Kanamori
- Department of Pediatric Surgery, University of Tokyo Faculty of Medicine, Tokyo, Japan
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Moriguchi M, Niwano S, Yoshizawa N, Kitano Y, Kojima J, Inuo K, Saitou J, Izumi T. Inhomogeneity in the appearance of electrical remodeling during chronic rapid atrial pacing: evaluation of the dispersion of atrial effective refractoriness. Jpn Circ J 2001; 65:335-40. [PMID: 11316134 DOI: 10.1253/jcj.65.335] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
In the present study, the long-term process of progression of electrical remodeling at various atrial sites, which is not well understood, was compared while monitoring continuously the electrophysiologic parameters at multirecording sites in canine atria during continuous atrial burst pacing. A rapid pacing device was implanted in 5 dogs, and continuous atrial burst pacing (400 beats/min) was delivered at the right atrial appendage (RAA). Four pairs of epicardial wire electrodes were sutured on (1) the RAA, (2) Bachmann's bundle (BB), (3) the right atrium close to the inferior vena cava (IVC), and (4) the left atrium (LA). The distal ends of those wires were exteriorized posteriorly and used for pacing and recording. The atrial effective refractory period (AERP), AERP dispersion (AERPd), atrial conduction time (CT) and inducibility of atrial fibrillation (AF) were evaluated during burst pacing for 14 days and during the subsequent 7 days' recovery. The AERP at the LA pacing site was shorter than that at the other sites on day 0. The AERP shortening was greater in the RAA and LA sites than in the BB and IVC sites. The AERPd increased during pacing and reached the maximum level on day 3, and then decreased during the recovery phase. Prolongation of CT tended to be longer between the RAAand IVC sites than that between the other sites. The incidence of AF induction became higher in accordance with the time course of the rapid pacing phase. There was another peak of AF induction on days 7-10. In a canine chronic rapid atrial stimulation model, the progression of electrical remodeling (ie, the shortening of the AERP and the prolongation of the CT) was not homogeneous in both atria, the AERPd showed a temporal increase between days 3 and 7 and matched the increase in AF inducibility at the LA pacing site, the increase in the AERPd was mainly caused by more rapid AERP shortening at the RAA or LA sites, and the LA site always showed a shorter AERP than the other atrial sites in the control state and during the rapid pacing phase, whereas AF inducibility was higher at the LA site than the other sites.
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Affiliation(s)
- M Moriguchi
- Department of Internal Medicine, Kitasato University School of Medicine, Sagamihara, Japan.
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Chiba K, Uchiyama R, Kim S, Kitano Y, Tada M. Benzylic Intermolecular Carbon−Carbon Bond Formation by Selective Anodic Oxidation of Dithioacetals. Org Lett 2001; 3:1245-8. [PMID: 11348205 DOI: 10.1021/ol015734a] [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] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
[reaction: see text]. Novel anodic intermolecular carbon-carbon bond formation has been accomplished by the oxidative carbon-sulfur bond fission of benzylic dithioacetals to give a wide variety of aromatic compounds. The substitution reaction successfully took place by the selective anodic oxidation of a sulfur atom of a dithioacetal. Stepwise double-substitution reactions were also achieved by the regulation of oxidation potential.
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Affiliation(s)
- K Chiba
- Laboratory of Bio-organic Chemistry, Tokyo University of Agriculture and Technology, 3-5-8 Saiwai-cho, Fuchu, Tokyo 183-8509, Japan.
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Niwano S, Kitano Y, Moriguchi M, Yoshizawa N, Kashiwa T, Suyama M, Toyoshima T, Izumi T. Leakage of energy to the body surface during defibrillation shock by an implantable cardioverter-defibrillator (ICD) system--experimental evaluation during defibrillation shocks through the right ventricular lead and the subcutaneous active-can in canines. Jpn Circ J 2001; 65:219-25. [PMID: 11266198 DOI: 10.1253/jcj.65.219] [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] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
The leakage of electrical current to the body surface during defibrillation shock delivery by an implantable cardioverter-defibrillator (ICD) device (the Medtronic Jewel Plus PCD system) was evaluated in 5 dogs. The defibrillation shocks were delivered between the active-can implanted in the left subclavicular region and the endocardial lead placed in the right ventricle at the energy levels of 1, 2, 8, 12, 24 and 34 J. During each delivery, the electrical current leakage from the body surface was measured by electrodes connected to a circuit at 4 recording positions: (A) parallel-subcutaneous (the electrodes were fixed in the subcutaneous tissue of the left shoulder and the right lower chest, and the direction of the electrode vector was parallel to the direction of the defibrillation energy flow); (B) cross-subcutaneous (the electrodes were fixed in the subcutaneous tissue of the right shoulder and the left lower chest, and the vector of the electrodes was roughly perpendicular to the direction of the energy flow); (C) parallel-surface (the electrodes were fixed with ECG paste on the shaved skin surface at the left shoulder and the right lower chest); and (D) surface grounded (the electrodes were fixed on the shaved skin surface at the left shoulder and the left foot, which was grounded). The circuit resistance was set at a variable level (100-5,000 ohms) in accordance with the resistance measured through each canine body. Leakage energies were measured in 750 defibrillation shocks with each circuit resistance in 5 dogs. The leakage energy increased in accordance with the increase of the delivered energy and the decrease of the circuit resistance in all 4 recording positions. When the circuit resistance was set at 1,000 ohms, the leakage energy during shock delivery at 34 J was 32+/-17 mJ at position A, 5+/-9 mJ at B, 10+/-9 mJ at C, and 4+/-3 mJ at D (p=0.042). The peak current was highest at position A and was 87+/-22 mA with a circuit resistance of 1,000 ohms. The power of the leakage energy depended on the delivered energy and the impedance between the electrodes. The angle between the alignment of the recording electrodes and the direction of the energy flow was another important factor in determining the leakage energy. Although the peak current of the leakage energy reached the level of macro shock, the highest leakage energy from the body surface was considerably less because of the short duration of the shock delivery.
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Affiliation(s)
- S Niwano
- Department of Internal Medicine, Kitasato University School of Medicine, Sagamihara, Kanagawa, Japan.
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Kitano Y, Kanai M, Davies P, von Allmen D, Yang EY, Radu A, Kitano Y, Adzick NS, Flake AW. BAPS prize-1999: Lung growth induced by prenatal tracheal occlusion and its modifying factors: a study in the rat model of congenital diaphragmatic hernia. J Pediatr Surg 2001; 36:251-9. [PMID: 11172410 DOI: 10.1053/jpsu.2001.20683] [Citation(s) in RCA: 32] [Impact Index Per Article: 1.4] [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: 11/11/2022]
Abstract
BACKGROUND/PURPOSE Prenatal tracheal occlusion (TO) has been shown to accelerate lung growth in animal models and models of pulmonary hypoplasia. However, these models may not mimic early events in human congenital diaphragmatic hernia (CDH). The authors previously have developed a model of TO in the rat. The purpose of this study was to apply this technique to characterize TO-induced lung growth in the early onset nitrofen-induced model of CDH, and to address the clinically important questions of the effect of timing of TO and maternal infusion of terbutaline on TO-induced lung growth. METHODS Left-sided CDH was induced in the fetuses of time-dated pregnant Sprague-Dawley rats by feeding 100 mg of nitrofen on day 9 of gestation. TO was performed via maternal laparotomy and hysterotomy at 19 days' gestation. At harvest (21.5 days' gestation), lungs from nitrofen-exposed fetuses without CDH (non-CDH), with CDH (CDH), and with CDH and TO (CDH-TO) were compared by analysis of wet and dry weight, DNA and protein content, and stereologic morphometry. A second study was performed to assess relative lung growth achieved by equal intervals of TO after "early" (19 days) versus "late" (20 days) gestational TO. Finally, the effect of maternal infusion of terbutaline, a commonly used tocolytic for fetal surgery, on TO-induced lung growth was analyzed. RESULTS Analysis of lung growth showed consistent and significant lung growth in CDH-TO lungs. Lung growth after TO was proliferative and characterized by an increase in parenchymal volume as manifest by increased total saccular number and surface area and radial saccular count. Although visceral reduction was partially achieved, herniated liver was reduced incompletely. The majority of lung growth occurred during the latter half of the TO period. Early gestational age at TO and maternal terbutaline administration adversely influenced lung growth in CDH-TO fetuses. CONCLUSIONS Prenatal TO induces dramatic lung growth in the early onset, nitrofen-induced rat model of CDH. TO is more effective later in gestation presumably because of the advanced stage of lung development and lung fluid production. This effect could be counterbalanced by the use of beta-mimetic tocolytic, which inhibits fetal lung fluid production late in gestation. Multiple factors including fetal lung fluid production and absorption, pharmacologic agents, space-occupying herniated viscera, and timing and duration of TO may be important clinical variables. The development of the rat model should facilitate further studies into the cellular and molecular mechanisms responsible for TO-induced lung growth.
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Affiliation(s)
- Y Kitano
- Children's Institute for Surgical Science and The Center for Fetal Diagnosis and Treatment, The Children's Hospital of Philadelphia, Philadelphia, PA 19104, USA
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Kitano Y, Von Allmen D, Kanai M, Quinn TM, Davies P, Kitano Y, Flake AW. Fetal lung growth after short-term tracheal occlusion is linearly related to intratracheal pressure. J Appl Physiol (1985) 2001; 90:493-500. [PMID: 11160047 DOI: 10.1152/jappl.2001.90.2.493] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.3] [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: 11/22/2022] Open
Abstract
Prenatal tracheal occlusion (TO) has been shown to accelerate fetal lung growth, yet the mechanism is poorly understood. The goal of this study was to determine the relationship between fetal intratracheal pressure (Pitr) and fetal lung growth after TO. Fetal lambs underwent placement of an intratracheal catheter and a reference catheter at 115--120 days gestation (term, 145 days). Fetal Pitr was continuously controlled at three levels (high, 8 mmHg; moderate, 4 mmHg; low, 1 mmHg) by a servo-regulated pump. The animals were killed after 4 days, and the parameters of lung growth were compared. Lung volume (136.0 +/- 16.7, 94.9 +/- 9.7, 55.5 +/- 12.4 ml/kg), lung-to-body weight ratio (6.31 +/- 0.70, 4.89 +/- 0.38, 3.39 +/- 0.22%), whole right lung dry weight (3.01 +/- 0.29, 2.53 +/- 0.15, 2.07 +/- 0.24 g/kg), right lung DNA (130.0 +/- 11.3, 116.7 +/- 8.6, 97.5 +/- 10.9 mg/kg), and protein contents (1,865.5 +/- 92.5, 1,657.6 +/- 106.8, 1,312.0 +/- 142.5 mg/kg) in high, moderate, and low groups, respectively, all increased in the moderate compared with the low group and increased further in the high compared with the moderate group. Morphometry confirmed a stepwise increase in the volume of respiratory region and alveolar surface area. We conclude that lung growth in the first 4 days after TO is closely correlated with fetal Pitr, offering additional evidence that an increase in lung expansion is one of the major factors responsible for TO-induced lung growth.
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Affiliation(s)
- Y Kitano
- The Children's Institute for Surgical Science and The Center for Fetal Diagnosis and Treatment, The Children's Hospital of Philadelphia, Philadelphia, Pennsylvania 19104-4399, USA
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Yang Z, Kitano Y, Chiba K, Shibata N, Kurokawa H, Doi Y, Arakawa Y, Tada M. Synthesis of variously oxidized abietane diterpenes and their antibacterial activities against MRSA and VRE. Bioorg Med Chem 2001; 9:347-56. [PMID: 11249127 DOI: 10.1016/s0968-0896(00)00253-4] [Citation(s) in RCA: 62] [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] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
Abstract
Variously oxidized 12 natural abietanes, 6,7-dehydroferruginol methyl ether (3), ferruginol (5), 11-hydroxy-12-oxo-7,9(11),13-abietatriene (7), royleanone (9), demethyl cryptojaponol (12), salvinolone (14), sugiol methyl ether (16), sugiol (17), 5,6-dehydrosugiol methyl ether (19), 5,6-dehydrosugiol (20), 6beta-hydroxyferruginol (23), and taxodione (25) were synthesized. Antimicrobial activities of synthesized phenolic diterpenes and their related compounds against MRSA and VRE were evaluated. Phenols (12-hydroxyabieta-8,11,13-trien-6-one 22 and 23), catechols (12 and 14) and taxodione 25 showed potent activity with 4-10 microg/mL of MIC against MRSA and 4-16 microg/mL of MIC against VRE. (-)-Ferruginol showed more potent activity than natural type (+)-ferruginol. Quinone methide 7 showed the most potent activity with 0.5-1 microg/mL of MIC against both MRSA and VRE.
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Affiliation(s)
- Z Yang
- Laboratory of Bioorganic Chemistry, Tokyo University of Agriculture and Technology, Fuchu, Japan
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Niwano S, Yoshizawa N, Inuo K, Saito J, Moriguchi M, Kitano Y, Izumi T. Evaluation of post-repolarization refractoriness for conduction block in cardiac muscle: studies in an artificial isthmus in the canine right atrium. Jpn Circ J 2001; 65:40-5. [PMID: 11153820 DOI: 10.1253/jcj.65.40] [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] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
Post-repolarization refractoriness (PRR) is an important factor in determining conduction block and is the difference between the effective refractory period (ERP) and the duration of the monophasic action potential (MAPD). In the present study, conduction block in an artificial isthmus in the canine atrium was evaluated and the coupling interval of a premature beat, which caused the block, was defined as the block coupling interval (BCI). The usefulness of this value was also evaluated. Radiofrequency linear ablation was performed on the right atrial surface parallel to the atrioventricular groove in 5 mongrel dogs, and an artificial isthmus (8-10mm wide and 25-30mm long) was created. Fourteen simultaneous unipolar recordings were performed in the isthmus with a resolution of 1.2 mm. Single extra-stimuli with basic drive train were delivered to induce conduction block in the isthmus and when it occurred, the coupling interval at the recording site just proximal to the site of the block was defined as the BCI. At the site of the block, the ERP and MAPD at each drive cycle length were measured. The PRR was calculated using 2 different formulae: (1) [ERP-MAPD], and (2) [BCI-MAPD]. It was found that each value was shortened in accordance with the shortening of the basic drive cycle length. In all basic drive trains, BCI>ERP>MAPD, and [ERP-MAPD] was always shorter than [BCI-MAPD]. In the shorter cycle length of basic drives, the difference between [ERP-MAPD] and [BCI-MAPD] was more prominent. In the artificial isthmus model in the canine atrium, BCI was always longer than the ERP measured at the same site as the block. Because the ERP may not directly reflect the block phenomenon, the electrophysiologic evaluation should use the BCI instead, as in the PRR evaluation.
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Affiliation(s)
- S Niwano
- Department of Internal Medicine, Kitasato Universit, School of Medicine, Sagamihara, Japan.
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Kitano Y, Radu A, Shaaban A, Flake AW. Selection, enrichment, and culture expansion of murine mesenchymal progenitor cells by retroviral transduction of cycling adherent bone marrow cells. Exp Hematol 2000; 28:1460-9. [PMID: 11146168 DOI: 10.1016/s0301-472x(00)00551-8] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
It has been difficult to characterize murine bone marrow (BM)-derived mesenchymal progenitor cells (MPCs) because of contamination with hematopoietic cells. We took advantage of the rapid proliferation of MPCs after replating to enrich murine MPCs by transfection with a retroviral vector carrying both LacZ and the selective neomycin resistance (neoR) gene. Freshly harvested BM cells from mice were incubated with BAG retroviral vector produced by amphotropic psi-CRIP or ecotropic psi-CRE producer cells for 48 hours and grown in the presence of G418.Cells incubated in psi-CRIP supernatant formed colonies composed of large homogeneous cells that were free of CD45(+) cells, but cells incubated in psi-CRE supernatant did not form stromal cell colonies. In the undifferentiated state, the cells displayed a fibroblast-like phenotype with low alkaline phosphatase activity. However, upon treatment with dexamethasone or 5-azacytidine, the retrovirally transduced cells differentiated into oil-red-O-positive adipocytic cells and osteogenic cells generating von Kossa-positive bone nodules. Osteogenic supplements composed of beta-glycerophosphate, dexamethasone, and ascorbic acid induced an increase in alkaline phosphatase activity and acute osteogenesis associated with early cell detachment. Subcutaneous injection with retrovirally transduced cells into day 1 newborn mice of the same strain produced ectopic calcium depositions surrounded by X-gal(+) cells. Retroviral selection of cycling adherent cells is an effective approach for enrichment of MPCs.
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Affiliation(s)
- Y Kitano
- Department of Surgery, Children's Hospital of Philadelphia, Philadelphia, PA 19104-4318, USA
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Abstract
An immediate reaction was investigated during repeated challenge testing for contact hypersensitivity to dinitrofluorobenzene (DNFB) in BALB/c mice. The mice were sensitized to DNFB on back skin and repeatedly challenged with the same hapten on the left ear at 1 week intervals. The ear after the 5th challenge showed biphasic responses which consisted of an immediate and a delayed-type reaction. The reactions were hapten specific. Mast cell-deficient WBB6F1 W/WV mice did not show any immediate reaction, while congenic normal mice showed both immediate and delayed-type reactions. Histologically, numerous dermal mast cells were found in the left ear of repeatedly challenged BALB/c and WBB6F1 normal mice, while there were few mast cells in the ear of WBB6F1 W/WV mice. Anti-DNP IgE antibodies were detected in BALB/c, WBB6F1 normal and W/WV mice after repeated challenge with DNFB. Intradermal injection of anti-IgE antibodies in the repeatedly DNFB-challenged ear elicited an immediate reaction. These results suggest that immediate contact hypersensitivity develops through the production of anti-DNP IgE antibodies and an increase in dermal mast cells after repeated challenge with DNFB.
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Affiliation(s)
- M Natsuaki
- Department of Dermatology, Hyogo College of Medicine, Nishinomiya, Japan
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Moriguchi M, Niwano S, Yoshizawa N, Kitano Y, Masaki Y, Maruyama S, Izumi T. Quantitative evaluation of a directly depolarized area induced by high-output pacing on the cardiac muscle. Jpn Circ J 2000; 64:876-82. [PMID: 11110434 DOI: 10.1253/jcj.64.876] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
Quantitative information is needed on the directly depolarized area (DDA) induced by high-output energy during a precise mapping procedure to detect the origin of a tachycardia. In the present study, a DDA caused by high-output energy was quantitatively evaluated in the exposed canine heart. In 8 dogs, the right atrial and ventricular surfaces were exposed through a right thoracotomy and pacing with various outputs was delivered from the epicardial surface. A comb-shaped 16 polar electrode array and/or a 224 polar mat electrode array were used for recording the epicardial electrograms. The local activation time was measured at each electrode site, and the relationship of the distance between the electrode location from the pacing site and the local activation time was plotted and fitted to a primary regression line. The intercept of the regression line on the horizontal axis was defined as the radius of the 'DDA' and this was evaluated at each pacing output. The radius of the DDA was 0.6+/-0.1 mm with a 2 V and 3.8+/-0.2 mm with a 10 V output when it was evaluated in a direction perpendicular to the fiber orientation of the pectinate muscle, 0.8+/-0.1 mm with a 2 V and 4.1+/-0.3 mm with a 10 V output in a direction parallel to the pectinate muscle fiber orientation, and 0.9+/-0.3 mm with a 2 V and 3.6+/-0.5 mm with a 10 V output in the right ventricle. The DDA extended according to the increase in stimulation outputs at all sites, and there was no significant difference in the pacing site or the direction of the stimulation propagation. The DDA caused by high-output energy is a purely physical phenomenon that depends only on stimulation output and tissue resistance. The diameter of the DDA exceeded 4 mm (ie, the size of a standard tip electrode for catheter ablation) when pacing was delivered with an output greater than 6 V.
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Affiliation(s)
- M Moriguchi
- Department of Internal Medicine, Kitasato University School of Medicine, Sagamihara, Japan.
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