LIVIVO - The Search Portal for Life Sciences

zur deutschen Oberfläche wechseln
Advanced search

Search results

Result 1 - 10 of total 19

Search options

  1. Article ; Online: Nucleic acid uptake occurs independent of lysosomal acidification but dependent on ATP consumption during RNautophagy/DNautophagy.

    Contu, Viorica Raluca / Sakai, Ryohei / Fujiwara, Yuuki / Kabuta, Chihana / Wada, Keiji / Kabuta, Tomohiro

    Biochemical and biophysical research communications

    2023  Volume 644, Page(s) 105–111

    Abstract: RNautophagy/DNautophagy (RDA) is an autophagic process that refers to the direct uptake of nucleic acids by lysosomes for degradation. Autophagy relies on lysosomes and lysosomal acidification is crucial for the degradation of intracellular components. ... ...

    Abstract RNautophagy/DNautophagy (RDA) is an autophagic process that refers to the direct uptake of nucleic acids by lysosomes for degradation. Autophagy relies on lysosomes and lysosomal acidification is crucial for the degradation of intracellular components. However, whether lysosomal acidification interferes with nucleic acid uptake during RDA is unclear. In this study, we focused on vacuolar H
    MeSH term(s) Nucleic Acids/metabolism ; RNA/genetics ; RNA/metabolism ; Lysosomes/metabolism ; Vacuolar Proton-Translocating ATPases/genetics ; Vacuolar Proton-Translocating ATPases/metabolism ; Hydrogen-Ion Concentration ; Adenosine Triphosphate/metabolism
    Chemical Substances Nucleic Acids ; RNA (63231-63-0) ; Vacuolar Proton-Translocating ATPases (EC 3.6.1.-) ; Adenosine Triphosphate (8L70Q75FXE)
    Language English
    Publishing date 2023-01-02
    Publishing country United States
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 205723-2
    ISSN 1090-2104 ; 0006-291X ; 0006-291X
    ISSN (online) 1090-2104 ; 0006-291X
    ISSN 0006-291X
    DOI 10.1016/j.bbrc.2022.12.090
    Database MEDical Literature Analysis and Retrieval System OnLINE

    More links

    Kategorien

  2. Article ; Online: Evaluation of the four-dimensional motion of lung tumors during end-exhalation breath-hold conditions using volumetric cine computed tomography images.

    Kamima, Tatsuya / Iino, Misae / Sakai, Ryohei / Ito, Yasushi / Sakae, Takeji / Moriya, Shunsuke / Tokumasu, Kenji / Yoshioka, Yasuo

    Radiotherapy and oncology : journal of the European Society for Therapeutic Radiology and Oncology

    2023  Volume 182, Page(s) 109573

    Abstract: Background and purpose: This study was performed to evaluate the four-dimensional motion of lung tumors during end-exhalation (EE) breath-holding (BH) using cine computed tomography (CT) and investigate the correlation between tumor and surrogate marker ...

    Abstract Background and purpose: This study was performed to evaluate the four-dimensional motion of lung tumors during end-exhalation (EE) breath-holding (BH) using cine computed tomography (CT) and investigate the correlation between tumor and surrogate marker motions.
    Materials and methods: This study included 28 patients who underwent stereotactic body radiation therapy at our institution and were capable of 15-20 s of EE BH within a ±1.5-mm gating window with external markers. During EE BH with cine CT, 21 s of continuous data were acquired using 320-row multislice CT. Displacements in the tumor position during EE BH were assessed in the left-right (LR), anterior-posterior (AP), and superior-inferior (SI) directions. Pearson's correlation coefficient (r) between tumor motions during EE BH and diaphragm/external marker motions was also determined.
    Results: The mean absolute maximum displacements of the tumor position during EE BH were 1.3 (range: 0.2-4.0), 1.9 (range: 0.3-12.0), and 1.3 (range: 0.1-7.2) mm in the LR, AP, and SI directions, respectively. The displacement of the tumor position in the AP direction was weakly correlated (|r| < 0.4) with the external marker and diaphragm displacements in many cases (proportions of 50% and 46%, respectively).
    Conclusion: We found some cases showing substantial displacement in lung tumor positions during EE BH, especially in the AP direction. Because these tumor position displacements did not correlate with surrogate markers and were difficult to detect, we recommend pretreatment evaluation of the four-dimensional motions of tumors during BH using cine CT.
    MeSH term(s) Humans ; Exhalation ; Breath Holding ; Lung Neoplasms/diagnostic imaging ; Lung Neoplasms/radiotherapy ; Lung Neoplasms/pathology ; Motion ; Cone-Beam Computed Tomography/methods ; Four-Dimensional Computed Tomography/methods ; Respiration
    Language English
    Publishing date 2023-02-21
    Publishing country Ireland
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 605646-5
    ISSN 1879-0887 ; 0167-8140
    ISSN (online) 1879-0887
    ISSN 0167-8140
    DOI 10.1016/j.radonc.2023.109573
    Database MEDical Literature Analysis and Retrieval System OnLINE

    More links

    Kategorien

  3. Article ; Online: Angioscopic findings of a first-generation drug-eluting stent occurring very late stent thrombosis 13 years after implantation.

    Sakai, Ryohei / Ozaki, Kazuyuki / Kubota, Naoki / Takano, Toshiki / Hoyano, Makoto / Inomata, Takayuki

    Cardiovascular intervention and therapeutics

    2021  Volume 37, Issue 2, Page(s) 395–396

    MeSH term(s) Angioscopy ; Coronary Thrombosis/diagnosis ; Coronary Thrombosis/etiology ; Drug-Eluting Stents/adverse effects ; Humans ; Sirolimus ; Thrombosis/diagnosis ; Thrombosis/etiology
    Chemical Substances Sirolimus (W36ZG6FT64)
    Language English
    Publishing date 2021-05-31
    Publishing country Japan
    Document type Journal Article
    ZDB-ID 2581654-8
    ISSN 1868-4297 ; 1868-4300
    ISSN (online) 1868-4297
    ISSN 1868-4300
    DOI 10.1007/s12928-021-00785-4
    Database MEDical Literature Analysis and Retrieval System OnLINE

    More links

    Kategorien

  4. Article: The Ubiquitin Ligase RNF34 Participates in the Peripheral Quality Control of CFTR (RNF34 Role in CFTR PeriQC).

    Taniguchi, Shogo / Ito, Yukiko / Kiritani, Hibiki / Maruo, Asuka / Sakai, Ryohei / Ono, Yuji / Fukuda, Ryosuke / Okiyoneda, Tsukasa

    Frontiers in molecular biosciences

    2022  Volume 9, Page(s) 840649

    Abstract: The peripheral protein quality control (periQC) system eliminates the conformationally defective cystic fibrosis transmembrane conductance regulator (CFTR), including ∆F508-CFTR, from the plasma membrane (PM) and limits the efficacy of pharmacological ... ...

    Abstract The peripheral protein quality control (periQC) system eliminates the conformationally defective cystic fibrosis transmembrane conductance regulator (CFTR), including ∆F508-CFTR, from the plasma membrane (PM) and limits the efficacy of pharmacological therapy for cystic fibrosis (CF). The ubiquitin (Ub) ligase RFFL is responsible for the chaperone-independent ubiquitination and lysosomal degradation of CFTR in the periQC. Here, we report that the Ub ligase RNF34 participates in the CFTR periQC in parallel to RFFL. An
    Language English
    Publishing date 2022-03-09
    Publishing country Switzerland
    Document type Journal Article
    ZDB-ID 2814330-9
    ISSN 2296-889X
    ISSN 2296-889X
    DOI 10.3389/fmolb.2022.840649
    Database MEDical Literature Analysis and Retrieval System OnLINE

    More links

    Kategorien

  5. Article ; Online: Baseline Blood Pressure and Left Ventricular Reverse Remodeling in Dilated Cardiomyopathy with Spontaneous Mechanical Alternans.

    Watanabe, Mitsuhiro / Kashimura, Takeshi / Ishizuka, Mitsuo / Kase, Mayumi / Sakai, Ryohei / Fujiki, Shinya / Takayama, Tsugumi / Ishihara, Shiro / Ozaki, Kazuyuki / Inomata, Takayuki

    Internal medicine (Tokyo, Japan)

    2022  Volume 62, Issue 12, Page(s) 1707–1713

    Abstract: Objective Spontaneous mechanical alternans (MA), or pulsus alternans, has been observed in heart failure patients with hypertension or tachycardia for 150 years and is considered a sign of a poor prognosis. However, in some dilated cardiomyopathy (DCM) ... ...

    Abstract Objective Spontaneous mechanical alternans (MA), or pulsus alternans, has been observed in heart failure patients with hypertension or tachycardia for 150 years and is considered a sign of a poor prognosis. However, in some dilated cardiomyopathy (DCM) patients with MA, optimal medical therapy (OMT) brings left ventricular reverse remodeling (LVRR), a preferable prognostic indicator. This study examined the probability of LVRR in DCM patients with spontaneous MA and whether or not LVRR can be predicted by the baseline blood pressure or heart rate. Methods We conducted a single-center, retrospective observational study of newly diagnosed DCM patients from January 2017 to December 2020. Results Thirty-three newly diagnosed DCM patients were retrospectively examined. Spontaneous MA was observed during diagnostic cardiac catheterization in at least 1 of the pressure waveforms of the aorta, left ventricle, pulmonary artery, or right ventricle in 10 patients (30%) (MA-group). LVRR after OMT was achieved roughly equally in the MA group (6 of 10, 60%) and the non-MA group (12 of 23, 52%). In the MA group, those who achieved LVRR had a significantly higher baseline systolic aortic pressure (more than 120 mmHg in all 6 patients) than those who did not, although the baseline heart rate did not show a significant correlation with LVRR. In contrast, in the non-MA group, LVRR was unrelated to the baseline aortic pressure or heart rate. Conclusion The probability of LVRR in newly-diagnosed DCM patients with spontaneous MA was similar to that in those without spontaneous MA. Spontaneous MA may not necessarily be a sign of a poor prognosis if observed in patients with a preserved blood pressure.
    MeSH term(s) Humans ; Cardiomyopathy, Dilated/complications ; Ventricular Function, Left/physiology ; Retrospective Studies ; Blood Pressure ; Heart Failure ; Prognosis
    Language English
    Publishing date 2022-11-09
    Publishing country Japan
    Document type Observational Study ; Journal Article
    ZDB-ID 32371-8
    ISSN 1349-7235 ; 0021-5120 ; 0918-2918
    ISSN (online) 1349-7235
    ISSN 0021-5120 ; 0918-2918
    DOI 10.2169/internalmedicine.0711-22
    Database MEDical Literature Analysis and Retrieval System OnLINE

    More links

    Kategorien

  6. Article ; Online: Long-Term Outcomes in Patients with Not-Retrieval Inferior Vena Cava Filter Under Anticoagulation.

    Sakai, Ryohei / Fujiki, Shinya / Kashimura, Takeshi / Tsuchiya, Hiroki / Takahashi, Kazuyoshi / Ozaki, Kazuyuki / Okura, Yuji / Hanzawa, Kazuhiko / Inomata, Takayuki

    International heart journal

    2022  Volume 63, Issue 2, Page(s) 306–311

    Abstract: Since permanent inferior vena cava (IVC) filters increase deep vein thrombosis (DVT), filter retrieval should be performed as possible. Despite the guideline recommendation, IVC filters are not always retrieved in clinical practice. To date, many ... ...

    Abstract Since permanent inferior vena cava (IVC) filters increase deep vein thrombosis (DVT), filter retrieval should be performed as possible. Despite the guideline recommendation, IVC filters are not always retrieved in clinical practice. To date, many patients with not-retrieval IVC filters have been prescribed anticoagulant therapy, but the long-term prognosis, including venous thromboembolism (VTE) and bleeding events, remains unknown. In this study, 195 patients who underwent IVC filter implantation between 2006 and 2017 at 3 institutions in Niigata City have been investigated about their deaths, VTE recurrence, and bleeding events. After peaking 2009, the number of IVC filter implantation gradually decreased. During observational period, there were 158 patients with not-retrieval IVC filters (the overall retrieval rate of 19.0%). The not-retrieval group included significantly older and more patients with cancer compared to the retrieval group. Anticoagulation therapy was continued in 88% of the not-retrieval group. During a mean follow-up of 5.0 years, 6 symptomatic DVT events associated with inadequate control of anticoagulation and 13 bleeding events were observed. A total of 52 patients died and only the presence of cancer was prognostic risk factor. Although long-term anticoagulation therapy may be associated with bleeding events, there were few recurrent VTE under optimal anticoagulation. It is anticipated that even if the IVC filter cannot be retrieved, appropriate anticoagulation is useful for prevention of DVT recurrence despite the risk of bleeding.
    MeSH term(s) Anticoagulants/adverse effects ; Blood Coagulation ; Device Removal/adverse effects ; Humans ; Vena Cava Filters/adverse effects ; Venous Thromboembolism/etiology ; Venous Thromboembolism/prevention & control
    Chemical Substances Anticoagulants
    Language English
    Publishing date 2022-03-30
    Publishing country Japan
    Document type Journal Article ; Observational Study
    ZDB-ID 2187806-7
    ISSN 1349-3299 ; 1349-2365
    ISSN (online) 1349-3299
    ISSN 1349-2365
    DOI 10.1536/ihj.21-814
    Database MEDical Literature Analysis and Retrieval System OnLINE

    More links

    Kategorien

  7. Article ; Online: Optimal Timing of Serial

    Ishizuka, Mitsuo / Kashimura, Takeshi / Watanabe, Mitsuhiro / Kase, Mayumi / Sakai, Ryohei / Okubo, Takeshi / Fujiki, Shinya / Takayama, Tsugumi / Ishihara, Shiro / Ozaki, Kazuyuki / Inomata, Takayuki

    International heart journal

    2023  Volume 64, Issue 2, Page(s) 196–202

    Abstract: Immunosuppressive therapy with prednisolone (PSL) is the first-line treatment for cardiac sarcoidosis (CS), ... ...

    Abstract Immunosuppressive therapy with prednisolone (PSL) is the first-line treatment for cardiac sarcoidosis (CS), and
    MeSH term(s) Humans ; Prednisolone/therapeutic use ; Fluorodeoxyglucose F18 ; Cardiomyopathies/diagnostic imaging ; Cardiomyopathies/drug therapy ; Radiopharmaceuticals ; Positron-Emission Tomography/methods ; Sarcoidosis/diagnostic imaging ; Sarcoidosis/drug therapy ; Myocarditis ; Retrospective Studies
    Chemical Substances Prednisolone (9PHQ9Y1OLM) ; Fluorodeoxyglucose F18 (0Z5B2CJX4D) ; Radiopharmaceuticals
    Language English
    Publishing date 2023-03-15
    Publishing country Japan
    Document type Observational Study ; Journal Article
    ZDB-ID 2187806-7
    ISSN 1349-3299 ; 1349-2365
    ISSN (online) 1349-3299
    ISSN 1349-2365
    DOI 10.1536/ihj.22-406
    Database MEDical Literature Analysis and Retrieval System OnLINE

    More links

    Kategorien

  8. Article ; Online: A case of giant cell myocarditis mimicking cardiac sarcoidosis successfully maintained by prednisolone and tacrolimus.

    Tsuchiya, Hiroki / Kashimura, Takeshi / Washiyama, Yuzo / Kumaki, Takayuki / Watanabe, Mitsuhiro / Kase, Mayumi / Ishizuka, Mitsuo / Sakai, Ryohei / Fujiki, Shinya / Takayama, Tsugumi / Ishihara, Shiro / Inomata, Takayuki

    Journal of cardiology cases

    2023  Volume 27, Issue 6, Page(s) 258–261

    Abstract: A 45-year-old woman with no medical history underwent pacemaker implantation for a symptomatic complete atrioventricular block. On day 6, she noticed diplopia and then fever, general malaise, and elevation of serum creatinine kinase (CK). She was ... ...

    Abstract A 45-year-old woman with no medical history underwent pacemaker implantation for a symptomatic complete atrioventricular block. On day 6, she noticed diplopia and then fever, general malaise, and elevation of serum creatinine kinase (CK). She was transferred to our hospital on day 21. Serum CK was elevated to 4543 IU/L, and echocardiography revealed a left ventricular ejection fraction of 43 %. We diagnosed her with giant cell myocarditis (GCM) via an emergent myocardial biopsy that revealed a proliferation of lymphocytes, eosinophils, and giant cells without granulomas. Initial treatment with high doses of intravenous methylprednisolone and immunoglobulin improved her symptoms in a few days, and prednisolone was given as follow-up treatment. CK was normalized in a week and a thinning of the interventricular septum mimicking cardiac sarcoidosis (CS) occurred. On day 38, we added a calcineurin inhibitor, tacrolimus, and maintained her with a combination of prednisolone and tacrolimus at a target dose of 10-15 ng/mL. Six months after the onset, there were no signs of relapse despite the persistent mild elevation of troponin I levels. We present a case of GCM mimicking CS successfully maintained by a combination of two immunosuppressive agents.
    Learning objective: Recommended treatment for giant cell myocarditis (GCM), a potentially fatal disease, is a combination of three immunosuppressive agents. However, GCM shares many characteristics with cardiac sarcoidosis (CS), which is treated using prednisolone alone in many cases. Recent studies on GCM and CS suggest they are different spectrums of a common entity. Although they can clinically overlap, they have different progressive speeds and severities. We present a case of GCM mimicking CS successfully treated with a combination of two immunosuppressive agents.
    Language English
    Publishing date 2023-02-17
    Publishing country Japan
    Document type Case Reports
    ISSN 1878-5409
    ISSN (online) 1878-5409
    DOI 10.1016/j.jccase.2023.01.009
    Database MEDical Literature Analysis and Retrieval System OnLINE

    More links

    Kategorien

  9. Article: Substituent effects in magnesium tetraethynylporphyrin with two diketopyrrolopyrrole units for bulk heterojunction organic solar cells

    Ogumi, Keisuke / Nakagawa, Takafumi / Okada, Hiroshi / Sakai, Ryohei / Wang, Huan / Matsuo, Yutaka

    Journal of materials chemistry A. 2017 Nov. 14, v. 5, no. 44

    2017  

    Abstract: Magnesium tetraethynylporphyrin complexes with two aryl groups (Ar = Ph, C6H4-n-hexyl-4, C6H4-CF3-4, and C6H4-NMe2-4) and two thienyl-substituted diketopyrrolopyrrole units were synthesized by Sonogashira coupling reactions. Electrochemical measurements ... ...

    Abstract Magnesium tetraethynylporphyrin complexes with two aryl groups (Ar = Ph, C6H4-n-hexyl-4, C6H4-CF3-4, and C6H4-NMe2-4) and two thienyl-substituted diketopyrrolopyrrole units were synthesized by Sonogashira coupling reactions. Electrochemical measurements and photoelectron yield spectroscopy showed that the energy levels of the compounds could be effectively tuned by electron-withdrawing and -donating substituents on the aryl groups. Theoretical calculation revealed that the electronic effects of the Ar group substituents strongly affected the energy level of the highest occupied molecular orbital (HOMO) because the localized HOMO on the porphyrin core was conjugated with the Ar groups through ethynyl linkers. Bulk heterojunction small-molecule organic solar cells with these magnesium porphyrin electron donors were fabricated to evaluate the morphological and electronic effects of the Ar group substituents. The n-hexyl groups promoted the formation of phase-separated structures with a high fill factor, yielding a respectable power conversion efficiency of 5.73%. The use of the electron-withdrawing CF3 group gave a high open-circuit voltage of 0.79 V because of the lowered HOMO level, while the use of the electron-donating NMe2 group produced a low band gap that extended the incident photon-to-current conversion efficiency spectrum to 1100 nm.
    Keywords electric potential difference ; electrochemistry ; magnesium ; moieties ; porphyrins ; solar cells ; spectroscopy
    Language English
    Dates of publication 2017-1114
    Size p. 23067-23077.
    Publishing place The Royal Society of Chemistry
    Document type Article
    ZDB-ID 2702232-8
    ISSN 2050-7496 ; 2050-7488
    ISSN (online) 2050-7496
    ISSN 2050-7488
    DOI 10.1039/c7ta07576f
    Database NAL-Catalogue (AGRICOLA)

    More links

    Kategorien

  10. Article ; Online: Pulmonary Artery Sarcoma Diagnosed Using an Endovascular Catheter Forceps Biopsy.

    Sakai, Ryohei / Ozaki, Kazuyuki / Yamaguchi, Yumi / Kubota, Naoki / Takano, Toshiki / Okubo, Takeshi / Kimura, Shinpei / Hoyano, Makoto / Yanagawa, Takao / Kashimura, Takeshi / Minamino, Tohru

    Internal medicine (Tokyo, Japan)

    2020  Volume 59, Issue 17, Page(s) 2149–2153

    Abstract: We herein report a case of pulmonary artery sarcoma (PAS) in a 64-year-old woman. She was admitted to our hospital because of massive genital bleeding from endometrial cancer. Contrast-enhanced computed tomography (CT) revealed a left pulmonary artery ... ...

    Abstract We herein report a case of pulmonary artery sarcoma (PAS) in a 64-year-old woman. She was admitted to our hospital because of massive genital bleeding from endometrial cancer. Contrast-enhanced computed tomography (CT) revealed a left pulmonary artery mass and deep vein thrombosis. She underwent anticoagulant therapy for one year. However, the mass lesion gradually expanded.
    MeSH term(s) Biopsy/methods ; Catheterization/methods ; Endometrial Neoplasms/complications ; Endovascular Procedures ; Female ; Humans ; Lung Neoplasms/diagnosis ; Lung Neoplasms/etiology ; Lung Neoplasms/physiopathology ; Lung Neoplasms/surgery ; Middle Aged ; Positron Emission Tomography Computed Tomography/methods ; Pulmonary Artery/physiopathology ; Sarcoma/diagnosis ; Sarcoma/etiology ; Sarcoma/physiopathology ; Sarcoma/surgery ; Treatment Outcome
    Language English
    Publishing date 2020-06-02
    Publishing country Japan
    Document type Journal Article
    ZDB-ID 32371-8
    ISSN 1349-7235 ; 0021-5120 ; 0918-2918
    ISSN (online) 1349-7235
    ISSN 0021-5120 ; 0918-2918
    DOI 10.2169/internalmedicine.4738-20
    Database MEDical Literature Analysis and Retrieval System OnLINE

    More links

    Kategorien

To top