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Ghadi R, Kuche K, Date T, Nallamothu B, Chaudhari D, Jain S. Unlocking apoptosis in triple negative breast cancer: Harnessing "glutamine trap" to amplify the efficacy of lapatinib-loaded mixed micelles. Biomater Adv 2024; 159:213822. [PMID: 38442461 DOI: 10.1016/j.bioadv.2024.213822] [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] [Subscribe] [Scholar Register] [Received: 01/01/2024] [Revised: 02/19/2024] [Accepted: 02/28/2024] [Indexed: 03/07/2024]
Abstract
Certain aggressive cancers, such as triple-negative breast cancer (TNBC), heavily bank on glutamine for their proliferation and survival. In this context, TNBC functions as a "glutamine trap," extracting circulating glutamine at a rate surpassing that of any other organ. Moreover, the overexpression of Alanine, Serine, Cysteine Transporter 2 (ASCT2), a key player in glutamine uptake, further underscores the significance of targeted therapy to enhance TNBC treatment. This led to the exploration of a novel approach involving hydrophobized Pluronic-based mixed micelles achieved through the use of docosahexaenoic acid and stapled with glutamine for displaying inherent ASCT2 targeting ability-a formulation termed LPT G-MM. LPT G-MM exhibited optimal characteristics, including a size of 163.66 ± 10.34 nm, a polydispersity index of 0.237 ± 0.083, and an enhanced drug loading capacity of approximately 15 %. Transmission electron microscopy validated the spherical shape of these micelles. In vitro release studies demonstrated drug release in a sustained manner without the risk of hemolysis. Importantly, LPT G-MM displayed heightened cellular uptake, increased cytotoxicity, a lower IC50 value, elevated reactive oxygen species, induced mitochondrial membrane depolarization, and a greater apoptosis index in TNBC cell lines compared to free LPT. The pharmacokinetic profile of LPT G-MM revealed a substantial rise in half-life (t1/2) by approximately 1.48-fold and an elevation in the area under the curve [AUC(0→∞)] by approximately 1.19-fold. Moreover, there was a significant reduction in the percentage of tumor volume by approximately 7.26-fold, along with decreased serum toxicity markers compared to free LPT. In summary, LPT G-MM demonstrated promising potential in boosting payload capacities and targeting specificity in the context of TNBC treatment.
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Affiliation(s)
- Rohan Ghadi
- Centre for Pharmaceutical Nanotechnology, Department of Pharmaceutics, National Institute of Pharmaceutical Education and Research (NIPER), Sector 67, S.A.S. Nagar, Punjab 160062, India
| | - Kaushik Kuche
- Centre for Pharmaceutical Nanotechnology, Department of Pharmaceutics, National Institute of Pharmaceutical Education and Research (NIPER), Sector 67, S.A.S. Nagar, Punjab 160062, India
| | - Tushar Date
- Centre for Pharmaceutical Nanotechnology, Department of Pharmaceutics, National Institute of Pharmaceutical Education and Research (NIPER), Sector 67, S.A.S. Nagar, Punjab 160062, India
| | - Bhargavi Nallamothu
- Centre for Pharmaceutical Nanotechnology, Department of Pharmaceutics, National Institute of Pharmaceutical Education and Research (NIPER), Sector 67, S.A.S. Nagar, Punjab 160062, India
| | - Dasharath Chaudhari
- Centre for Pharmaceutical Nanotechnology, Department of Pharmaceutics, National Institute of Pharmaceutical Education and Research (NIPER), Sector 67, S.A.S. Nagar, Punjab 160062, India
| | - Sanyog Jain
- Centre for Pharmaceutical Nanotechnology, Department of Pharmaceutics, National Institute of Pharmaceutical Education and Research (NIPER), Sector 67, S.A.S. Nagar, Punjab 160062, India.
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Kuche K, Yadav V, Patel M, Chaudhari D, Date T, Jain S. Enhancing anti-cancer potential by delivering synergistic drug combinations via phenylboronic acid modified PLGA nanoparticles through ferroptosis-based therapy. Biomater Adv 2024; 156:213700. [PMID: 38042001 DOI: 10.1016/j.bioadv.2023.213700] [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] [Subscribe] [Scholar Register] [Received: 06/12/2023] [Revised: 10/11/2023] [Accepted: 11/09/2023] [Indexed: 12/04/2023]
Abstract
In this study, we investigated the potential of the sorafenib (SOR) and simvastatin (SIM) combination to induce ferroptosis-mediated cancer therapy. To enhance targeted drug delivery, we encapsulated the SOR + SIM combination within 4-carboxy phenylboronic acid (CPBA) modified PLGA nanoparticles (CPBA-PLGA(SOR + SIM)-NPs). The developed CPBA-PLGA(SOR + SIM)-NPs exhibited a spherical shape with a size of 213.1 ± 10.9 nm, a PDI of 0.22 ± 0.03, and a Z-potential of -22.9 ± 3.2 mV. Notably, these nanoparticles displayed faster drug release at acidic pH compared to physiological pH. In cellular experiments, CPBA-PLGA(SOR + SIM)-NPs demonstrated remarkable improvements, leading to a 2.51, 2.69, and 2.61-fold decrease in IC50 compared to SOR alone, and a 7.50, 16.71, and 5.11-fold decrease in IC50 compared to SIM alone in MDA-MB-231, A549, and HeLa cells, respectively. Furthermore, CPBA-PLGA(SOR + SIM)-NPs triggered a reduction in glutathione (GSH) levels, an increase in malondialdehyde (MDA) levels, and mitochondrial membrane depolarization in all three cell lines. Pharmacokinetic evaluation revealed a 2.50- and 2.63-fold increase in AUC0-∞, as well as a 1.53- and 2.46-fold increase in mean residence time (MRT) for SOR and SIM, respectively, compared to the free drug groups. Notably, the CPBA-PLGA(SOR + SIM)-NPs group exhibited significant reduction in tumor volume, approximately 9.17, 2.45, and 1.63-fold lower than the control, SOR + SIM, and PLGA(SOR + SIM)-NPs groups, respectively. Histological examination and biomarker analysis showed no significant differences compared to the control group, suggesting the biocompatibility of the developed particles for in-vivo applications. Altogether, our findings demonstrate that CPBA-PLGA(SOR + SIM)-NPs hold tremendous potential as an efficient drug delivery system for inducing ferroptosis, providing a promising therapeutic option for cancer treatment.
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Affiliation(s)
- Kaushik Kuche
- Centre for Pharmaceutical Nanotechnology, Department of Pharmaceutics, National Institute of Pharmaceutical Education and Research (NIPER), S.A.S. Nagar, Sector 67, Mohali, Punjab 160062, India
| | - Vivek Yadav
- Centre for Pharmaceutical Nanotechnology, Department of Pharmaceutics, National Institute of Pharmaceutical Education and Research (NIPER), S.A.S. Nagar, Sector 67, Mohali, Punjab 160062, India
| | - Meet Patel
- Centre for Pharmaceutical Nanotechnology, Department of Pharmaceutics, National Institute of Pharmaceutical Education and Research (NIPER), S.A.S. Nagar, Sector 67, Mohali, Punjab 160062, India
| | - Dasharath Chaudhari
- Centre for Pharmaceutical Nanotechnology, Department of Pharmaceutics, National Institute of Pharmaceutical Education and Research (NIPER), S.A.S. Nagar, Sector 67, Mohali, Punjab 160062, India
| | - Tushar Date
- Centre for Pharmaceutical Nanotechnology, Department of Pharmaceutics, National Institute of Pharmaceutical Education and Research (NIPER), S.A.S. Nagar, Sector 67, Mohali, Punjab 160062, India
| | - Sanyog Jain
- Centre for Pharmaceutical Nanotechnology, Department of Pharmaceutics, National Institute of Pharmaceutical Education and Research (NIPER), S.A.S. Nagar, Sector 67, Mohali, Punjab 160062, India.
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Kuche K, Yadav V, Dharshini M, Ghadi R, Chaudhari D, Date T, Jain S. Synergistic anticancer therapy via ferroptosis using modified bovine serum albumin nanoparticles loaded with sorafenib and simvastatin. Int J Biol Macromol 2023; 253:127254. [PMID: 37813219 DOI: 10.1016/j.ijbiomac.2023.127254] [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: 06/06/2023] [Revised: 10/01/2023] [Accepted: 10/03/2023] [Indexed: 10/11/2023]
Abstract
Ferroptosis is a non-apoptotic cell death pathway characterized by the accumulation of lipid-peroxy radicals within the affected cells. Here, we investigate the synergistic capacity of sorafenib (SOR) and simvastatin (SIM) to trigger ferroptosis for cancer therapy. For precise in-vivo delivery, SOR + SIM was ratiometrically loaded in bovine serum albumin nanoparticles (BSA-NPs) modified with 4-carboxy phenylboronic acid (CPBA). The developed CPBA-BSA(SOR + SIM)-NPs revealed size of 175.2 ± 12.8 nm, with PDI of 0.22 ± 0.03 and Z-potential of -29.6 ± 4.8 mV. Significantly, CPBA-BSA(SOR + SIM)-NPs exhibited > 2 and > 5-fold reduction in IC50 values compared to individual SOR and SIM treatments respectively, in all tested cell lines. Moreover, CPBA-BSA(SOR + SIM)-NPs treated cells exhibited decrease in glutathione levels, increase in malonaldehyde levels and depolarization of mitochondrial membrane potential (JC-1 assay). Pharmacokinetic analysis revealed enhanced AUC0-∞ and MRT levels for SOR and SIM when administered as CPBA-BSA(SOR + SIM)-NPs compared to free drugs. Crucially, in in-vivo experiments, CPBA-BSA(SOR + SIM)-NPs led to a significant reduction in tumor volume compared to various control groups. Histological and biomarker analyses underscore their biocompatibility for clinical applications. In conclusion, this study highlights the potential of CPBA-BSA(SOR + SIM)-NPs as a promising strategy for inducing ferroptosis in cancer cells, concurrently improving drug delivery and therapeutic efficacy. This approach opens new avenues in cancer treatment.
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Affiliation(s)
- Kaushik Kuche
- Centre for Pharmaceutical Nanotechnology, Department of Pharmaceutics, National Institute of Pharmaceutical Education and Research (NIPER), S.A.S. Nagar, Sector 67, Mohali, Punjab 160062, India
| | - Vivek Yadav
- Centre for Pharmaceutical Nanotechnology, Department of Pharmaceutics, National Institute of Pharmaceutical Education and Research (NIPER), S.A.S. Nagar, Sector 67, Mohali, Punjab 160062, India
| | - M Dharshini
- Centre for Pharmaceutical Nanotechnology, Department of Pharmaceutics, National Institute of Pharmaceutical Education and Research (NIPER), S.A.S. Nagar, Sector 67, Mohali, Punjab 160062, India
| | - Rohan Ghadi
- Centre for Pharmaceutical Nanotechnology, Department of Pharmaceutics, National Institute of Pharmaceutical Education and Research (NIPER), S.A.S. Nagar, Sector 67, Mohali, Punjab 160062, India
| | - Dasharath Chaudhari
- Centre for Pharmaceutical Nanotechnology, Department of Pharmaceutics, National Institute of Pharmaceutical Education and Research (NIPER), S.A.S. Nagar, Sector 67, Mohali, Punjab 160062, India
| | - Tushar Date
- Centre for Pharmaceutical Nanotechnology, Department of Pharmaceutics, National Institute of Pharmaceutical Education and Research (NIPER), S.A.S. Nagar, Sector 67, Mohali, Punjab 160062, India
| | - Sanyog Jain
- Centre for Pharmaceutical Nanotechnology, Department of Pharmaceutics, National Institute of Pharmaceutical Education and Research (NIPER), S.A.S. Nagar, Sector 67, Mohali, Punjab 160062, India.
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Ghadi R, Pandey PK, Gabhale A, Wadikar A, Dharshini M, Kuche K, Date T, Jain S. Genipin-crosslinked albumin nanoparticles containing neratinib and silibinin: A dual-death therapy for triple negative breast cancer. Int J Pharm 2023; 648:123570. [PMID: 37918494 DOI: 10.1016/j.ijpharm.2023.123570] [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: 05/20/2023] [Revised: 10/29/2023] [Accepted: 10/30/2023] [Indexed: 11/04/2023]
Abstract
Triple negative breast cancer (TNBC) cells resist chemotherapy by hijacking apoptosis. Alternative cell death forms like ferroptosis offer new treatment options. A combined therapy using neratinib (NTB; ferroptosis inducer) and silibinin (SLB; apoptosis inducer) via albumin-based nanocarriers (N-S Alb NPs) was explored to target TNBC. N-S Alb NPs had optimal size (134.26 ± 10.23 nm), PDI (0.224 ± 0.01), and % entrapment efficiency (∼80 % for NTB and ∼87 % for SLB). Transmission electron microscopy confirmed their spherical shape. In vitro release studies showed sustained drug release without hemolysis risk. N-S Alb NPs had higher cellular uptake and cytotoxicity than individual drugs or their mixture. IC50 values for N-S Alb NPs were significantly reduced in MDA-MB-231 (∼2.23-fold) and 4T1 (∼1.85-fold) cell lines and apoptosis index were significantly higher in MDA-MB-231 (∼1.31-fold) and 4T1 cell line (∼1.35-fold) than the physical mixture of both drugs (NTB + SLB). N-S Alb NPs generated more reactive oxygen species (ROS) and caused mitochondrial membrane depolarization, indicating increased cell death. They also exhibited better ferroptosis induction by reducing glutathione (GSH), increasing Fe2+ activity and MDA levels in TNBC cells. Thus, N-S Alb NPs had the ability to promote "mixed" type cell death, showed promise in enhancing the payload capabilities and targeting in TNBC.
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Affiliation(s)
- Rohan Ghadi
- Centre for Pharmaceutical Nanotechnology, Department of Pharmaceutics, National Institute of Pharmaceutical Education and Research (NIPER), Sector 67, S.A.S. Nagar, Punjab 160062, India
| | - Pawan Kumar Pandey
- Centre for Pharmaceutical Nanotechnology, Department of Pharmaceutics, National Institute of Pharmaceutical Education and Research (NIPER), Sector 67, S.A.S. Nagar, Punjab 160062, India
| | - Akash Gabhale
- Centre for Pharmaceutical Nanotechnology, Department of Pharmaceutics, National Institute of Pharmaceutical Education and Research (NIPER), Sector 67, S.A.S. Nagar, Punjab 160062, India
| | - Aaradhya Wadikar
- Centre for Pharmaceutical Nanotechnology, Department of Pharmaceutics, National Institute of Pharmaceutical Education and Research (NIPER), Sector 67, S.A.S. Nagar, Punjab 160062, India
| | - M Dharshini
- Centre for Pharmaceutical Nanotechnology, Department of Pharmaceutics, National Institute of Pharmaceutical Education and Research (NIPER), Sector 67, S.A.S. Nagar, Punjab 160062, India
| | - Kaushik Kuche
- Centre for Pharmaceutical Nanotechnology, Department of Pharmaceutics, National Institute of Pharmaceutical Education and Research (NIPER), Sector 67, S.A.S. Nagar, Punjab 160062, India
| | - Tushar Date
- Centre for Pharmaceutical Nanotechnology, Department of Pharmaceutics, National Institute of Pharmaceutical Education and Research (NIPER), Sector 67, S.A.S. Nagar, Punjab 160062, India
| | - Sanyog Jain
- Centre for Pharmaceutical Nanotechnology, Department of Pharmaceutics, National Institute of Pharmaceutical Education and Research (NIPER), Sector 67, S.A.S. Nagar, Punjab 160062, India.
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Chaudhari D, Kuche K, Yadav V, Ghadi R, Date T, Bhargavi N, Jain S. Exploring paclitaxel-loaded adenosine-conjugated PEGylated PLGA nanoparticles for targeting triple-negative breast cancer. Drug Deliv Transl Res 2023; 13:1074-1087. [PMID: 36528709 DOI: 10.1007/s13346-022-01273-9] [Citation(s) in RCA: 8] [Impact Index Per Article: 8.0] [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] [Accepted: 11/29/2022] [Indexed: 12/23/2022]
Abstract
In present investigation, we developed paclitaxel (PTX)-loaded adenosine (ADN)-conjugated PLGA nanoparticles for combating triple-negative breast cancer (TNBC), where ADN acts as a substrate for adenosine receptors (AR) that are overexpressed in TNBC. Using synthesized PLGA-PEG-ADN, PTX-loaded nanoparticles (PTX ADN-PEG-PLGA NPs) were prepared via emulsion diffusion evaporation process that rendered particles of size 135 ± 12 nm, PDI of 0.119 ± 0.03, and entrapment-efficiency of 79.26 ± 2.52%. The NPs showed higher %cumulative release at pH 5.5 over 7.4 with Higuchi release kinetics. The PTX ADN-PEG-PLGA NPs showed ~ 4.87- and 5.22-fold decrease in %hemolysis in comparison to free PTX and Intaxel®, indicating their hemocompatible nature. The ADN modification assisted cytoplasmic internalization of particles via AR-mediated endocytosis that resulted in ~ 3.77- and 3.51-fold reduction in IC50 and showed apoptosis index of 0.93 and 1.18 in MDA-MB-231 and 4T1 cells respectively. The pharmacokinetic profile of ADN-PEG-PLGA NPs revealed higher AUC and t1/2 than Intaxel® and Nanoxel® pharmacodynamic activity showed ~ 18.90-fold lower %tumor burden than control. The kidney and liver function biomarkers showed insignificant change in the levels, when treated with PTX ADN-PEG-PLGA NPs and exhibited no histological alterations in the liver, spleen, and kidney. Overall, the optimized particles were found to be biocompatible with improved anti-TNBC activity.
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Affiliation(s)
- Dasharath Chaudhari
- Centre for Pharmaceutical Nanotechnology, Department of Pharmaceutics, National Institute of Pharmaceutical Education and Research (NIPER), S.A.S. Nagar, Punjab, 160062, India
| | - Kaushik Kuche
- Centre for Pharmaceutical Nanotechnology, Department of Pharmaceutics, National Institute of Pharmaceutical Education and Research (NIPER), S.A.S. Nagar, Punjab, 160062, India
| | - Vivek Yadav
- Centre for Pharmaceutical Nanotechnology, Department of Pharmaceutics, National Institute of Pharmaceutical Education and Research (NIPER), S.A.S. Nagar, Punjab, 160062, India
| | - Rohan Ghadi
- Centre for Pharmaceutical Nanotechnology, Department of Pharmaceutics, National Institute of Pharmaceutical Education and Research (NIPER), S.A.S. Nagar, Punjab, 160062, India
| | - Tushar Date
- Centre for Pharmaceutical Nanotechnology, Department of Pharmaceutics, National Institute of Pharmaceutical Education and Research (NIPER), S.A.S. Nagar, Punjab, 160062, India
| | - Nallamothu Bhargavi
- Centre for Pharmaceutical Nanotechnology, Department of Pharmaceutics, National Institute of Pharmaceutical Education and Research (NIPER), S.A.S. Nagar, Punjab, 160062, India
| | - Sanyog Jain
- Centre for Pharmaceutical Nanotechnology, Department of Pharmaceutics, National Institute of Pharmaceutical Education and Research (NIPER), S.A.S. Nagar, Punjab, 160062, India.
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Jain S, Kumar N, Sharma R, Ghadi R, Date T, Bhargavi N, Chaudhari D, Katiyar SS. Self-nanoemulsifying formulation for oral delivery of sildenafil: effect on physicochemical attributes and in vivo pharmacokinetics. Drug Deliv Transl Res 2023; 13:839-851. [PMID: 36223029 DOI: 10.1007/s13346-022-01247-x] [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] [Accepted: 10/01/2022] [Indexed: 02/04/2023]
Abstract
Sildenafil (SLD) is employed for the management of erectile dysfunction and pulmonary arterial hypertension. It exhibits meagre water solubility and is available in the form of citrate salt hydrate to improve the solubility. However, it still exhibits moderate solubility, high first-pass metabolism, resulting in very less oral bioavailability. The present study demonstrates the preparation of self-nanoemulsifying drug delivery system for augmenting the oral bioavailability of SLD. Oleic acid and Capmul MCM C8 blend (oil phase), Cremophor® RH40 (surfactant), and Labrafil® M1944 CS (cosurfactant) were selected as main constituents for making liquid preconcentrate based on the solubility and emulsification study. The preconcentrate upon dilution and emulsification showed droplet size 52.03 ± 13.03 nm, PDI 0.143 ± 0.028, and % transmittance was 99.77 ± 1.86% with SLD load of 40 mg/g of formulation. The prepared formulation was further assessed for stability, in vitro release, Caco-2 cell uptake, and in vivo pharmacokinetic performance. SLD-SNEDDS formulation was found to be robust in terms of stability against several folds dilution in the gastrointestinal tract (GIT), freeze-thaw cycles, and had a storage stability of 3 months at 4 °C and 25 °C. SLD-SNEDDS showed ~4.7-fold and ~5-fold increase in time- and concentration-dependent cellular uptake as against SLD cultured with Caco-2 cells. In vivo pharmacokinetic study revealed ~5.8- and ~2.5-fold increase in AUC0-∞ values in case of SLD-SNEDDS as against SLD suspension and SLD citrate solution, respectively.
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Affiliation(s)
- Sanyog Jain
- Centre for Pharmaceutical Nanotechnology, Department of Pharmaceutics, National Institute of Pharmaceutical Education and Research (NIPER), Sector 67, S.A.S. Nagar, Mohali, 160062, Punjab, India.
| | - Narinder Kumar
- Centre for Pharmaceutical Nanotechnology, Department of Pharmaceutics, National Institute of Pharmaceutical Education and Research (NIPER), Sector 67, S.A.S. Nagar, Mohali, 160062, Punjab, India
| | - Reena Sharma
- Centre for Pharmaceutical Nanotechnology, Department of Pharmaceutics, National Institute of Pharmaceutical Education and Research (NIPER), Sector 67, S.A.S. Nagar, Mohali, 160062, Punjab, India
| | - Rohan Ghadi
- Centre for Pharmaceutical Nanotechnology, Department of Pharmaceutics, National Institute of Pharmaceutical Education and Research (NIPER), Sector 67, S.A.S. Nagar, Mohali, 160062, Punjab, India
| | - Tushar Date
- Centre for Pharmaceutical Nanotechnology, Department of Pharmaceutics, National Institute of Pharmaceutical Education and Research (NIPER), Sector 67, S.A.S. Nagar, Mohali, 160062, Punjab, India
| | - Nallamothu Bhargavi
- Centre for Pharmaceutical Nanotechnology, Department of Pharmaceutics, National Institute of Pharmaceutical Education and Research (NIPER), Sector 67, S.A.S. Nagar, Mohali, 160062, Punjab, India
| | - Dasharath Chaudhari
- Centre for Pharmaceutical Nanotechnology, Department of Pharmaceutics, National Institute of Pharmaceutical Education and Research (NIPER), Sector 67, S.A.S. Nagar, Mohali, 160062, Punjab, India
| | - Sameer S Katiyar
- Centre for Pharmaceutical Nanotechnology, Department of Pharmaceutics, National Institute of Pharmaceutical Education and Research (NIPER), Sector 67, S.A.S. Nagar, Mohali, 160062, Punjab, India
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Chaudhari D, Katari O, Ghadi R, Kuche K, Date T, Bhargavi N, Jain S. Unfolding the Potency of Adenosine in Targeting Triple Negative Breast Cancer via Paclitaxel-Incorporated pH-Responsive Stealth Liposomes. ACS Biomater Sci Eng 2022; 8:3473-3484. [PMID: 35896042 DOI: 10.1021/acsbiomaterials.2c00594] [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] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Triple-negative breast cancer (TNBC) belongs to the category of the most destructive forms of breast cancer. Being a highly potent chemotherapeutic agent, paclitaxel (PTX) is extensively utilized in the management of various cancers. Commercially available PTX formulations contain non-targeted drug carriers that result in low antitumor activity because of non-specific tissue distribution. Thus, to resolve this issue, we designed PTX-loaded pH-sensitive liposomes (pH Lipos) in the present investigation and used adenosine (ADN) as a targeting ligand. Further, d-α-tocopheryl polyethylene glycol succinate (TPGS) was incorporated into the liposomes to impart a stealth effect to the system. For the development of these pH Lipos, different conjugates were synthesized (ADN-CHEMS and TPGS-ADN) and further utilized for the preparation of ADN-PEG-pH Lipo and ADN-pH Lipo by a thin-film hydration method. DOPE:HSPC:CHEMS:cholesterol at a molar ratio of 3:3:2:2 was selected for the preparation of pH-Lipo possessing 7.5% w/w drug loading. They showed a particle size below 140 nm, a PDI below 0.205, and a % EE greater than 60%. All of the pH Lipos displayed a biphasic pattern of PTX release at pH 7.4 and 5.5. However, the percent drug release at pH 5.5 was substantially greater because of the pH-sensitive nature of the liposomes. The MDA MB 231 and 4T1 cell lines depicted improvement in the qualitative as well as quantitative cellular uptake of PTX ADN-PEG-pH Lipo with a substantial decrease in the IC50 value. Moreover, a higher apoptotic index was observed with pH Lipo compared to free PTX. PTX ADN-PEG-pH Lipo revealed a 3.98- and 3.41-fold rise in the AUC and t1/2 values of PTX compared to Intaxel, respectively. Overall, characteristic decreases in tumor volume and serum toxicity marker levels were observed, which confirmed the development of an efficient and safe formulation.
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Affiliation(s)
- Dasharath Chaudhari
- Centre for Pharmaceutical Nanotechnology, Department of Pharmaceutics, National Institute of Pharmaceutical Education and Research (NIPER) S.A.S. Nagar, Punjab 160062, India
| | - Oly Katari
- Centre for Pharmaceutical Nanotechnology, Department of Pharmaceutics, National Institute of Pharmaceutical Education and Research (NIPER) S.A.S. Nagar, Punjab 160062, India
| | - Rohan Ghadi
- Centre for Pharmaceutical Nanotechnology, Department of Pharmaceutics, National Institute of Pharmaceutical Education and Research (NIPER) S.A.S. Nagar, Punjab 160062, India
| | - Kaushik Kuche
- Centre for Pharmaceutical Nanotechnology, Department of Pharmaceutics, National Institute of Pharmaceutical Education and Research (NIPER) S.A.S. Nagar, Punjab 160062, India
| | - Tushar Date
- Centre for Pharmaceutical Nanotechnology, Department of Pharmaceutics, National Institute of Pharmaceutical Education and Research (NIPER) S.A.S. Nagar, Punjab 160062, India
| | - Nallamothu Bhargavi
- Centre for Pharmaceutical Nanotechnology, Department of Pharmaceutics, National Institute of Pharmaceutical Education and Research (NIPER) S.A.S. Nagar, Punjab 160062, India
| | - Sanyog Jain
- Centre for Pharmaceutical Nanotechnology, Department of Pharmaceutics, National Institute of Pharmaceutical Education and Research (NIPER) S.A.S. Nagar, Punjab 160062, India
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Date T, Kuche K, Chaudhari D, Ghadi R, Sahel DK, Chitkara D, Jain S. Hitting Multiple Cellular Targets in Triple-Negative Breast Cancer Using Dual-Action Cisplatin(IV) Prodrugs for Safer Synergistic Chemotherapy. ACS Biomater Sci Eng 2022; 8:2349-2362. [PMID: 35522530 DOI: 10.1021/acsbiomaterials.1c01582] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
Abstract
Triple-negative breast cancer (TNBC) cells show improved sensitivity for cisplatin therapy due to their defective DNA damage repair system. However, the clinical utilization of cisplatin is limited by dose-dependent systemic toxicities and chemoresistance. Cisplatin Pt(IV) derivatives having kinetically inert octahedral geometry provide an effective strategy to overcome these limitations. Upon cellular reduction, these derivatives release cisplatin and axial ligands, acting as dual-action prodrugs. Hereby, we have developed three cisplatin(IV) conjugates using distinct bioactive axial moieties (valproate, tocopherol, and chlorambucil), which can synergistically complement cisplatin activity and attack multiple cellular targets. The designed derivatives showcased enhanced antiproliferative activity and improved therapeutic synergism along with a noteworthy cisplatin dose reduction index in a panel of six cancer cells. These Pt(IV) derivatives remarkably improved cellular drug uptake and showed lower dependency on copper transporter 1 (Ctr1) for uptake than cisplatin. The results of enhanced in vitro activity were well corroborated by in vivo efficacy testing in the 4T1 cell-based TNBC model, showcasing ∼2-7-folds higher tumor volume reduction for Pt(IV) derivatives than cisplatin. In addition, the designed derivatives significantly reduced the nephrotoxicity risk involved in cisplatin therapy, indicated by systemic toxicity biomarkers and organ histopathology. The results indicated that cisplatin(IV) derivatives could open new avenues for safer synergistic chemotherapy in TNBC.
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Affiliation(s)
- Tushar Date
- Centre for Pharmaceutical Nanotechnology, Department of Pharmaceutics, National Institute of Pharmaceutical Education and Research (NIPER), S.A.S. Nagar, Sector 67, Mohali 160062, Punjab, India
| | - Kaushik Kuche
- Centre for Pharmaceutical Nanotechnology, Department of Pharmaceutics, National Institute of Pharmaceutical Education and Research (NIPER), S.A.S. Nagar, Sector 67, Mohali 160062, Punjab, India
| | - Dasharath Chaudhari
- Centre for Pharmaceutical Nanotechnology, Department of Pharmaceutics, National Institute of Pharmaceutical Education and Research (NIPER), S.A.S. Nagar, Sector 67, Mohali 160062, Punjab, India
| | - Rohan Ghadi
- Centre for Pharmaceutical Nanotechnology, Department of Pharmaceutics, National Institute of Pharmaceutical Education and Research (NIPER), S.A.S. Nagar, Sector 67, Mohali 160062, Punjab, India
| | - Deepak Kumar Sahel
- Department of Pharmacy, Birla Institute of Technology and Science-Pilani, Vidya Vihar, Pilani 333031, Rajasthan, India
| | - Deepak Chitkara
- Department of Pharmacy, Birla Institute of Technology and Science-Pilani, Vidya Vihar, Pilani 333031, Rajasthan, India
| | - Sanyog Jain
- Centre for Pharmaceutical Nanotechnology, Department of Pharmaceutics, National Institute of Pharmaceutical Education and Research (NIPER), S.A.S. Nagar, Sector 67, Mohali 160062, Punjab, India
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Sirvi A, Kuche K, Chaudhari D, Ghadi R, Date T, Katiyar SS, Jain S. Supersaturable self-emulsifying drug delivery system: A strategy for improving the loading and oral bioavailability of quercetin. J Drug Deliv Sci Technol 2022. [DOI: 10.1016/j.jddst.2022.103289] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
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Date T, Kuche K, Ghadi R, Kumar P, Jain S. Understanding the Role of Axial Ligands in Modulating the Biopharmaceutical Outcomes of Cisplatin(IV) Derivatives. Mol Pharm 2022; 19:1325-1337. [PMID: 35437994 DOI: 10.1021/acs.molpharmaceut.1c00844] [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] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Cisplatin is a platinum (Pt)-based anticancer drug with broad-scale clinical utility. However, due to its hydrophilic nature and high kinetic reactivity, it offers numerous drug delivery challenges. Limitations such as severe systemic toxicities, chemoresistance, extensive cisplatin-plasma protein interaction, and limited cellular drug uptake reduce the therapeutic impact of cisplatin therapy. Cisplatin(IV) prodrug formation can effectively resolve these challenges. The selection of axial ligands could play a key role in determining the fate of cisplatin(IV) prodrugs by modulating the therapeutic and biopharmaceutical outcomes of therapy. Hereby, three cisplatin(IV) derivatives were developed utilizing valproate, tocopherol, and chlorambucil as axial ligands, and their biopharmaceutical performance was compared along with cisplatin. The impact of cisplatin(IV) derivative formation on their kinetic stability, drug-albumin interaction, cytotoxicity profile, cellular uptake pattern, self-assembling behavior, hemotoxicity, and tumor biodistribution pattern was analyzed to establish the correlation between the structural properties of cisplatin(IV) agents and their biopharmaceutical outcomes. The kinetic inertness of the designed cisplatin(IV) compounds helped in minimizing their plasma protein interactions and ensuring their stability in the blood environment. The lipophilicity enhancement due to Pt(IV) prodrug formation critically helped in enhancing the cellular drug uptake and reduced the dependence on transporters for drug uptake. The lipophilicity and activity of axial ligands were the key drivers governing the biopharmaceutical performance of the Pt(IV) derivatives. The properties of the axial ligand, such as its therapeutic activity, chemical backbone, and functional groups present in its structure, were the critical factors determining their plasma protein interaction, cellular uptake, anticancer activity, and self-assembly pattern. Cisplatin(IV) derivative formation further improved the amount of platinum accumulated in tumors after intravenous injection compared to free cisplatin therapy (2.7-5.4 folds increment) and reduced drug-erythrocyte interactions. Overall, the results highlighted the potential of cisplatin(IV) agents in resolving cisplatin drug delivery challenges and denoted the critical role of axial ligand selection in Pt(IV) prodrug designing.
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Affiliation(s)
- Tushar Date
- Centre for Pharmaceutical Nanotechnology, Department of Pharmaceutics, National Institute of Pharmaceutical Education and Research (NIPER), S.A.S. Nagar, Sector 67, Mohali, Punjab 160062, India
| | - Kaushik Kuche
- Centre for Pharmaceutical Nanotechnology, Department of Pharmaceutics, National Institute of Pharmaceutical Education and Research (NIPER), S.A.S. Nagar, Sector 67, Mohali, Punjab 160062, India
| | - Rohan Ghadi
- Centre for Pharmaceutical Nanotechnology, Department of Pharmaceutics, National Institute of Pharmaceutical Education and Research (NIPER), S.A.S. Nagar, Sector 67, Mohali, Punjab 160062, India
| | - Pradeep Kumar
- Wits Advanced Drug Delivery Platform Research Unit, Department of Pharmacy and Pharmacology, School of Therapeutic Sciences, Faculty of Health Sciences, University of the Witwatersrand, 7 York Road, Parktown, Johannesburg 2193, South Africa
| | - Sanyog Jain
- Centre for Pharmaceutical Nanotechnology, Department of Pharmaceutics, National Institute of Pharmaceutical Education and Research (NIPER), S.A.S. Nagar, Sector 67, Mohali, Punjab 160062, India
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Malavia N, Ghadi R, Kuche K, Date T, Bhargavi N, Chaudhari D, Swami R, Katare PB, Banerjee SK, Jain S. Green surfactant-dendrimer aggreplexes: An ingenious way to launch dual attack on arch-enemy cancer. Colloids Surf B Biointerfaces 2021; 204:111821. [PMID: 33971612 DOI: 10.1016/j.colsurfb.2021.111821] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/29/2020] [Revised: 03/26/2021] [Accepted: 05/01/2021] [Indexed: 01/08/2023]
Abstract
Combination therapy, which combines anti-cancer drugs with different oligonucleotides, have shown potential in cancer treatment. However, delivering a hydrophobic anti-cancer drug and a hydrophilic oligonucleotide simultaneously is a herculean task. This study takes advantage of interactions between histidine-lauric acid-based green surfactant and poly(amidoamine) dendrimers to achieve this aim. The green surfactant was synthesized by carbodiimide chemistry and characterized by FTIR, 1H-NMR, and mass spectroscopy. Further, green surfactant-dendrimer aggregates encapsulating DTX and complexing SIRT 1 shRNA i.e., "aggreplexes" were developed and characterized. The term "aggreplexes" signifies complexes which are formed between green-surfactant-dendrimer aggregates and SIRT-1 shRNA via electrostatic interaction. The aggreplexes displayed particle size of 262.33 ± 3.87 nm, PDI of 0.25 and entrapment efficiency of 70.56 %. The TEM images revealed spherical shape of aggreplexes with irregular outer surface and corroborated particle size obtained from zetasizer. The in-vitro release study revealed biphasic release patterns of DTX from aggreplexes and were compatible for intravenous administration. Further, aggreplexes augmented cellular uptake in MDA-MB-231 cells by ∼1.87-fold compared to free DTX. Also, EGFP expression revealed significantly higher transfection of aggreplexes compared to naked shRNA and Superfect™ complexes. Further, aggreplexes showed higher cytotoxicity in MDA-MB-231 cells and ∼4.16-fold reduction in IC50 value compared to free DTX. Finally, apoptosis-index observed in case of aggreplexes was ∼3.57-fold higher than free DTX. These novel aggreplexes showed increased drug loading capacity and superior gene transfection potential. Thus, they open new avenues for co-delivery of hydrophobic anti-cancer drugs and hydrophilic therapeutic genes for improving current standards of cancer therapy.
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Affiliation(s)
- Nilesh Malavia
- Centre for Pharmaceutical Nanotechnology, Department of Pharmaceutics, National Institute of Pharmaceutical Education and Research (NIPER), Sector 67, S.A.S. Nagar, Mohali, 160062, Punjab, India
| | - Rohan Ghadi
- Centre for Pharmaceutical Nanotechnology, Department of Pharmaceutics, National Institute of Pharmaceutical Education and Research (NIPER), Sector 67, S.A.S. Nagar, Mohali, 160062, Punjab, India
| | - Kaushik Kuche
- Centre for Pharmaceutical Nanotechnology, Department of Pharmaceutics, National Institute of Pharmaceutical Education and Research (NIPER), Sector 67, S.A.S. Nagar, Mohali, 160062, Punjab, India
| | - Tushar Date
- Centre for Pharmaceutical Nanotechnology, Department of Pharmaceutics, National Institute of Pharmaceutical Education and Research (NIPER), Sector 67, S.A.S. Nagar, Mohali, 160062, Punjab, India
| | - Nallamothu Bhargavi
- Centre for Pharmaceutical Nanotechnology, Department of Pharmaceutics, National Institute of Pharmaceutical Education and Research (NIPER), Sector 67, S.A.S. Nagar, Mohali, 160062, Punjab, India
| | - Dasharath Chaudhari
- Centre for Pharmaceutical Nanotechnology, Department of Pharmaceutics, National Institute of Pharmaceutical Education and Research (NIPER), Sector 67, S.A.S. Nagar, Mohali, 160062, Punjab, India
| | - Rajan Swami
- Centre for Pharmaceutical Nanotechnology, Department of Pharmaceutics, National Institute of Pharmaceutical Education and Research (NIPER), Sector 67, S.A.S. Nagar, Mohali, 160062, Punjab, India
| | - Parmeshwar B Katare
- Drug Discovery Research Centre, Translational Health Science and Technology Institute, Faridabad, 121001, India
| | - Sanjay K Banerjee
- Drug Discovery Research Centre, Translational Health Science and Technology Institute, Faridabad, 121001, India; Department of Biotechnology, National Institute of Pharmaceutical Education and Research (NIPER), Guwahati, Assam, 781101, India
| | - Sanyog Jain
- Centre for Pharmaceutical Nanotechnology, Department of Pharmaceutics, National Institute of Pharmaceutical Education and Research (NIPER), Sector 67, S.A.S. Nagar, Mohali, 160062, Punjab, India.
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Abstract
Amphotericin B (AmB) is gold standard therapy for leishmaniasis and fungal infections. Considering the global disease burden, nearly 90% of cases occur in economically vulnerable countries, making the cost of AmB therapy a critical healthcare challenge in controlling disease burden. All currently marketed AmB products are administered through an intravenous (i.v.) route and involve high treatment costs. Designing an orally effective AmB formulation can substantially reduce the cost of therapy and improve patient compliance. However, it is a challenging task because of the distinctive physicochemical properties of AmB. Previously, we developed a lipid-based prodrug of AmB, AmB-oleyl conjugate (AmB-OA), which showcased remarkable stability in the gastrointestinal (GI) environment and improved intestinal permeation. Hereby, we have developed self-nanoemulsifiying drug delivery system (SNEDDS) of AmB-OA to further enhance the oral bioavailability of AmB and potentiate its therapeutic benefits. SNEDDS was developed by screening a wide range of oils, surfactants, and cosurfactants, and formulation composition was optimized using extreme vertices design. AmB-OA SNEDDS possessed the ability of quick self-nanoemulsification on dilution (droplet size ∼56 nm) along with remarkable stability in the GI environment. Accelerated stability (40 °C/75% relative humidity) studies and freeze-thaw cycling studies proved that the formulation was stable at tropical conditions as well as temperature cycling stress. Drug transport analysis in Caco-2 cells revealed a remarkable increase in drug transport for AmB-OA SNEDDS compared to AmB along with minimal cellular toxicities. AmB-OA SNEDDS showcased ∼8.9-fold higher AUCTot than AmB in in vivo pharmacokinetic study, proving the effectiveness of formulation to enhance oral bioavailability. In vivo toxicity analysis highlighted the ameliorated toxicity risk associated with SNEDDS formulation. Therefore, the AmB-OA SNEDDS formulation may provide a cost-friendly and effective strategy to resolve the oral AmB drug delivery challenge.
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Affiliation(s)
- Kaushik Thanki
- Centre for Pharmaceutical Nanotechnology, Department of Pharmaceutics, National Institute of Pharmaceutical Education and Research (NIPER), S.A.S. Nagar (Mohali), Sector 67, Punjab 160062, India
| | - Tushar Date
- Centre for Pharmaceutical Nanotechnology, Department of Pharmaceutics, National Institute of Pharmaceutical Education and Research (NIPER), S.A.S. Nagar (Mohali), Sector 67, Punjab 160062, India
| | - Sanyog Jain
- Centre for Pharmaceutical Nanotechnology, Department of Pharmaceutics, National Institute of Pharmaceutical Education and Research (NIPER), S.A.S. Nagar (Mohali), Sector 67, Punjab 160062, India
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Bathara M, Date T, Chaudhari D, Ghadi R, Kuche K, Jain S. Exploring the Promising Potential of High Permeation Vesicle-Mediated Localized Transdermal Delivery of Docetaxel in Breast Cancer To Overcome the Limitations of Systemic Chemotherapy. Mol Pharm 2020; 17:2473-2486. [PMID: 32496783 DOI: 10.1021/acs.molpharmaceut.0c00211] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Abstract
The currently available systemic chemotherapy for treating breast cancer often results in serious systemic side effects and compromises patient compliance. The distinct anatomical features of human breasts (e.g., embryological origin of breast skin, highly developed internal lymphatic and venous circulation, and the presence of mammary fat layers) help in preferential accumulation of drugs into breasts after topical application on breast region. This unique feature is termed as localized transdermal delivery which could be utilized for effectively delivering anticancer agents to treat breast cancer and reducing the systemic side effects by limiting their presence in blood. However, the clinical effectiveness of this drug delivery approach is highly limited by barrier properties of skin reducing the permeation of anticancer drugs. In the present work, we have developed high permeation vesicles (HPVs) using phospholipids and synergistic combination of permeation enhancers (SCOPE) to improve the skin permeation of drugs. Docetaxel (DTX) was used as a model drug for hypothesis testing. The optimized SCOPE mixture composed of sodium oleate/sodium lauryl ether sulfate/propylene glycol in 64:16:20% w/w ratio. DTX HPVs were prepared using phospholipid: SCOPE, 8:2% w/w ratio. DTX HPVs exhibited as a uniform deformable vesicles with size range 124.2 ± 7.6 nm, significantly improved skin permeation profile, and sustained drug release until 48 h. Superior vesicle deformability, better vesicle membrane fluidization, and SCOPE mediated enhancement in skin fluidization were the prime factors behind enhancement of DTX permeation. The improved cellular uptake, reduced IC50 values, and higher apoptotic index of DTX HPVs in MCF-7 and MDA-MB-231 cells ensured the therapeutic effectiveness of HPV based therapy. Also, HPVs were found to be predominantly internalized inside cells through clathrin and caveolae-dependent endocytic pathways. Bioimaging analysis in mice confirmed the tumor penetration potential and effective accumulation of HPVs inside tumors after topical application. In vivo studies were carried out in comparison with marketed intravenous DTX injection (Taxotere) to compare the effectiveness of topical chemotherapy. The topical application of DTX HPV gel in tumor bearing mice resulted in nearly 4-fold tumor volume reduction which was equivalent to intravenous Taxotere therapy. Toxicity analysis of DTX HPV gel in comparison with intravenous Taxotere dosing showcased remarkably lower levels of toxicity biomarkers (aspartate transaminase (AST), alanine transaminase (ALT), blood urea nitrogen (BUN), and creatinine), indicating improved safety of topical chemotherapy. Overall results warranted the effectiveness of topical DTX chemotherapy to reduce tumor burden with substantially reduced risk of systemic toxicities in breast cancer.
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Affiliation(s)
- Minal Bathara
- Centre for Pharmaceutical Nanotechnology, Department of Pharmaceutics, National Institute of Pharmaceutical Education and Research (NIPER), S.A.S. Nagar (Mohali), Sector 67, Punjab 160062, India
| | - Tushar Date
- Centre for Pharmaceutical Nanotechnology, Department of Pharmaceutics, National Institute of Pharmaceutical Education and Research (NIPER), S.A.S. Nagar (Mohali), Sector 67, Punjab 160062, India
| | - Dasharath Chaudhari
- Centre for Pharmaceutical Nanotechnology, Department of Pharmaceutics, National Institute of Pharmaceutical Education and Research (NIPER), S.A.S. Nagar (Mohali), Sector 67, Punjab 160062, India
| | - Rohan Ghadi
- Centre for Pharmaceutical Nanotechnology, Department of Pharmaceutics, National Institute of Pharmaceutical Education and Research (NIPER), S.A.S. Nagar (Mohali), Sector 67, Punjab 160062, India
| | - Kaushik Kuche
- Centre for Pharmaceutical Nanotechnology, Department of Pharmaceutics, National Institute of Pharmaceutical Education and Research (NIPER), S.A.S. Nagar (Mohali), Sector 67, Punjab 160062, India
| | - Sanyog Jain
- Centre for Pharmaceutical Nanotechnology, Department of Pharmaceutics, National Institute of Pharmaceutical Education and Research (NIPER), S.A.S. Nagar (Mohali), Sector 67, Punjab 160062, India
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Thanki K, Date T, Jain S. Improved Oral Bioavailability and Gastrointestinal Stability of Amphotericin B through Fatty Acid Conjugation Approach. Mol Pharm 2019; 16:4519-4529. [DOI: 10.1021/acs.molpharmaceut.9b00662] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
Affiliation(s)
- Kaushik Thanki
- Centre for Pharmaceutical Nanotechnology, Department of Pharmaceutics, National Institute of Pharmaceutical Education and Research (NIPER), Sector 67, Phase X, SAS Nagar (Mohali), Punjab 160062, India
| | - Tushar Date
- Centre for Pharmaceutical Nanotechnology, Department of Pharmaceutics, National Institute of Pharmaceutical Education and Research (NIPER), Sector 67, Phase X, SAS Nagar (Mohali), Punjab 160062, India
| | - Sanyog Jain
- Centre for Pharmaceutical Nanotechnology, Department of Pharmaceutics, National Institute of Pharmaceutical Education and Research (NIPER), Sector 67, Phase X, SAS Nagar (Mohali), Punjab 160062, India
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Jain S, Khare P, Date T, Katiyar SS, Kushwah V, Katariya MK, Swami R. Mechanistic insights into high permeation vesicle-mediated synergistic enhancement of transdermal drug permeation. Nanomedicine (Lond) 2019; 14:2227-2241. [DOI: 10.2217/nnm-2018-0519] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Aim: To design a nanocarrier platform for enhanced transdermal drug permeation. Materials & methods: Gel-based high permeation vesicles (HPVs) were developed and their performance in terms of transdermal flux improvement, in vitro release and skin irritancy was assessed. The mechanistic insights of permeation enhancement were explored using confocal laser scanning microscopy, ATR-FTIR, DSC and P31 NMR. Results: HPVs exhibited as vesicles with uniform size (∼150 nm), extended drug-release profile (∼48 h) and improved transdermal flux. HPVs were also nontoxic and nonirritant to skin. Enhanced vesicle deformability, improved vesicle membrane fluidity and synergistic permeation enhancement action of synergistic combination of permeation enhancer components was found to be responsible for HPV-mediated permeation enhancement. Conclusion: Overall, the study established that HPVs demonstrate a promising therapeutic advantage over conventional transdermal drug carriers.
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Affiliation(s)
- Sanyog Jain
- Department of Pharmaceutics, Centre for Pharmaceutical Nanotechnology, National Institute of Pharmaceutical Education & Research (NIPER), Sector 67, S.A.S. Nagar (Mohali), Punjab 160062, India
| | - Pragati Khare
- Department of Pharmaceutics, Centre for Pharmaceutical Nanotechnology, National Institute of Pharmaceutical Education & Research (NIPER), Sector 67, S.A.S. Nagar (Mohali), Punjab 160062, India
| | - Tushar Date
- Department of Pharmaceutics, Centre for Pharmaceutical Nanotechnology, National Institute of Pharmaceutical Education & Research (NIPER), Sector 67, S.A.S. Nagar (Mohali), Punjab 160062, India
| | - Sameer S Katiyar
- Department of Pharmaceutics, Centre for Pharmaceutical Nanotechnology, National Institute of Pharmaceutical Education & Research (NIPER), Sector 67, S.A.S. Nagar (Mohali), Punjab 160062, India
| | - Varun Kushwah
- Department of Pharmaceutics, Centre for Pharmaceutical Nanotechnology, National Institute of Pharmaceutical Education & Research (NIPER), Sector 67, S.A.S. Nagar (Mohali), Punjab 160062, India
| | - Mahesh K Katariya
- Department of Pharmaceutics, Centre for Pharmaceutical Nanotechnology, National Institute of Pharmaceutical Education & Research (NIPER), Sector 67, S.A.S. Nagar (Mohali), Punjab 160062, India
| | - Rajan Swami
- Department of Pharmaceutics, Centre for Pharmaceutical Nanotechnology, National Institute of Pharmaceutical Education & Research (NIPER), Sector 67, S.A.S. Nagar (Mohali), Punjab 160062, India
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Jain S, Dongave SM, Date T, Kushwah V, Mahajan RR, Pujara N, Kumeria T, Popat A. Succinylated β-Lactoglobuline-Functionalized Multiwalled Carbon Nanotubes with Improved Colloidal Stability and Biocompatibility. ACS Biomater Sci Eng 2019; 5:3361-3372. [DOI: 10.1021/acsbiomaterials.9b00268] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Affiliation(s)
- Sanyog Jain
- Centre for Pharmaceutical Nanotechnology, Department of Pharmaceutics, National Institute of Pharmaceutical Education and Research (NIPER), Sec 67, S.A.S. Nagar (Mohali), Punjab 160062, India
| | - Shesherao M. Dongave
- Centre for Pharmaceutical Nanotechnology, Department of Pharmaceutics, National Institute of Pharmaceutical Education and Research (NIPER), Sec 67, S.A.S. Nagar (Mohali), Punjab 160062, India
| | - Tushar Date
- Centre for Pharmaceutical Nanotechnology, Department of Pharmaceutics, National Institute of Pharmaceutical Education and Research (NIPER), Sec 67, S.A.S. Nagar (Mohali), Punjab 160062, India
| | - Varun Kushwah
- Centre for Pharmaceutical Nanotechnology, Department of Pharmaceutics, National Institute of Pharmaceutical Education and Research (NIPER), Sec 67, S.A.S. Nagar (Mohali), Punjab 160062, India
| | - Rahul R. Mahajan
- Centre for Pharmaceutical Nanotechnology, Department of Pharmaceutics, National Institute of Pharmaceutical Education and Research (NIPER), Sec 67, S.A.S. Nagar (Mohali), Punjab 160062, India
| | - Naisarg Pujara
- School of Pharmacy, The University of Queensland Brisbane, Queensland 4102, Australia
| | - Tushar Kumeria
- School of Pharmacy, The University of Queensland Brisbane, Queensland 4102, Australia
- Translational Research Institute, Mater Research Institute, The University of Queensland, Woolloongabba, Queensland 4102, Australia
| | - Amirali Popat
- School of Pharmacy, The University of Queensland Brisbane, Queensland 4102, Australia
- Translational Research Institute, Mater Research Institute, The University of Queensland, Woolloongabba, Queensland 4102, Australia
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Date T, Paul K, Singh N, Jain S. Drug-Lipid Conjugates for Enhanced Oral Drug Delivery. AAPS PharmSciTech 2019; 20:41. [PMID: 30610658 DOI: 10.1208/s12249-018-1272-0] [Citation(s) in RCA: 17] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/28/2018] [Accepted: 12/11/2018] [Indexed: 02/07/2023] Open
Abstract
Oral drug delivery route is one of the most convenient and extensively utilised routes for drug administration. But there exists class of drugs which exhibit poor bioavailability on oral drug administration. Designing of drug-lipid conjugates (DLCs) is one of the rationale strategy utilised in overcoming this challenge. This review extensively covers the various dimensions of drug modification using lipids to attain improved oral drug delivery. DLCs help in improving oral delivery by providing benefits like improved permeability, stability in gastric environment, higher drug loading in carriers, formation of self-assembled nanostructures, etc. The clinical effectiveness of DLCs is highlighted from available marketed drug products along with many DLCs in phase of clinical trials. Conclusively, this drug modification strategy can potentially help in augmenting oral drug delivery in future.
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Hoshino K, Sugiyama M, Date T, Maruwaka S, Arakaki S, Shibata D, Maeshiro T, Hokama A, Sakugawa H, Kanto T, Fujita J, Mizokami M. Phylogenetic and phylodynamic analyses of hepatitis C virus subtype 1a in Okinawa, Japan. J Viral Hepat 2018; 25:976-985. [PMID: 29577516 DOI: 10.1111/jvh.12898] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/28/2017] [Accepted: 02/02/2018] [Indexed: 12/28/2022]
Abstract
Okinawa Island, located in Southern Japan, has a higher prevalence rate of hepatitis C virus subtype 1a (HCV-1a) infection than that in mainland Japan. Okinawa has a history of US military occupation after World War II. To elucidate the transmission history of HCV-1a in Okinawa, 26 whole-genome sequences were obtained from 29 patients during 2011-2016. Phylogenetic trees were reconstructed to identify the origin and characteristics of HCV-1a in Okinawa with epidemiological information. A phylogenetic tree based on whole-genome sequencing revealed that all of the samples were located below the US branches. Additionally, we identified one cluster comprised of 17 strains (Okinawa, n = 16; United States, n = 1). The majority of the patients in this cluster were people who inject drugs (PWID), indicating the presence of a people who inject drugs (PWID) cluster. Subsequently, Bayesian analyses were employed to reveal viral population dynamics. Intriguingly, a phylodynamic analysis uncovered a substantial increase in effective population size of HCV-1a from 1965 to 1980 and a slight increase in mid-2000, which were associated with an increase in illicit drug use in Okinawa. The estimated divergence time of the PWID cluster was 1967.6 (1964.2-1971.1). These findings suggest that HCV-1a was introduced into Okinawa from the United States in the late 1960s, coincident with the Vietnam War. Subsequently, HCV-1a might have spread among the Japanese population with the spread of injecting drug use. Our study provides an understanding of HCV transmission dynamics in Okinawa, as well as the key role of PWID in HCV transmission.
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Affiliation(s)
- K Hoshino
- Genome Medical Science Project, National Center for Global Health and Medicine, Chiba, Japan.,Department of Infectious, Respiratory, and Digestive Medicine, Graduate School of Medicine, University of the Ryukyus, Okinawa, Japan
| | - M Sugiyama
- Genome Medical Science Project, National Center for Global Health and Medicine, Chiba, Japan
| | - T Date
- Genome Medical Science Project, National Center for Global Health and Medicine, Chiba, Japan
| | - S Maruwaka
- Department of Infectious, Respiratory, and Digestive Medicine, Graduate School of Medicine, University of the Ryukyus, Okinawa, Japan
| | - S Arakaki
- Department of Infectious, Respiratory, and Digestive Medicine, Graduate School of Medicine, University of the Ryukyus, Okinawa, Japan
| | - D Shibata
- Digestive Division, Heart Life Hospital, Okinawa, Japan
| | - T Maeshiro
- Department of Infectious, Respiratory, and Digestive Medicine, Graduate School of Medicine, University of the Ryukyus, Okinawa, Japan
| | - A Hokama
- Department of Infectious, Respiratory, and Digestive Medicine, Graduate School of Medicine, University of the Ryukyus, Okinawa, Japan
| | - H Sakugawa
- Digestive Division, Heart Life Hospital, Okinawa, Japan
| | - T Kanto
- Department of Liver Diseases, National Center for Global Health and Medicine, Chiba, Japan
| | - J Fujita
- Department of Infectious, Respiratory, and Digestive Medicine, Graduate School of Medicine, University of the Ryukyus, Okinawa, Japan
| | - M Mizokami
- Genome Medical Science Project, National Center for Global Health and Medicine, Chiba, Japan
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Sharma S, Mazumdar S, Italiya KS, Date T, Mahato RI, Mittal A, Chitkara D. Cholesterol and Morpholine Grafted Cationic Amphiphilic Copolymers for miRNA-34a Delivery. Mol Pharm 2018; 15:2391-2402. [PMID: 29747513 DOI: 10.1021/acs.molpharmaceut.8b00228] [Citation(s) in RCA: 24] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Abstract
miR-34a is a master tumor suppressor playing a key role in the several signaling mechanisms involved in cancer. However, its delivery to the cancer cells is the bottleneck in its clinical translation. Herein we report cationic amphiphilic copolymers grafted with cholesterol (chol), N, N-dimethyldipropylenetriamine (cation chain) and 4-(2-aminoethyl)morpholine (morph) for miR-34a delivery. The copolymer interacts with miR-34a at low N/P ratios (∼2/1) to form nanoplexes of size ∼108 nm and a zeta potential ∼ +39 mV. In vitro studies in 4T1 and MCF-7 cells indicated efficient transfection efficiency. The intracellular colocalization suggested that the copolymer effectively transported the FAM labeled siRNA into the cytoplasm within 2 h and escaped from the endo-/lysosomal environment. The developed miR-34a nanoplexes inhibited the breast cancer cell growth as confirmed by MTT assay wherein 28% and 34% cancer cell viability was observed in 4T1 and MCF-7 cells, respectively. Further, miR-34a nanoplexes possess immense potential to induce apoptosis in both cell lines.
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Affiliation(s)
- Saurabh Sharma
- Department of Pharmacy , Birla Institute of Technology and Science-Pilani (BITS) , Pilani Campus, Vidya Vihar , Pilani - 333031 , Rajasthan , India
| | - Samrat Mazumdar
- Department of Pharmacy , Birla Institute of Technology and Science-Pilani (BITS) , Pilani Campus, Vidya Vihar , Pilani - 333031 , Rajasthan , India
| | - Kishan S Italiya
- Department of Pharmacy , Birla Institute of Technology and Science-Pilani (BITS) , Pilani Campus, Vidya Vihar , Pilani - 333031 , Rajasthan , India
| | - Tushar Date
- Department of Pharmacy , Birla Institute of Technology and Science-Pilani (BITS) , Pilani Campus, Vidya Vihar , Pilani - 333031 , Rajasthan , India
| | - Ram I Mahato
- Department of Pharmaceutical Sciences , College of Pharmacy, University of Nebraska Medical Center , 986125 Nebraska Medical Center , Omaha , Nebraska 68198-6125 , United States
| | - Anupama Mittal
- Department of Pharmacy , Birla Institute of Technology and Science-Pilani (BITS) , Pilani Campus, Vidya Vihar , Pilani - 333031 , Rajasthan , India
| | - Deepak Chitkara
- Department of Pharmacy , Birla Institute of Technology and Science-Pilani (BITS) , Pilani Campus, Vidya Vihar , Pilani - 333031 , Rajasthan , India
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Date T, Nimbalkar V, Kamat J, Mittal A, Mahato RI, Chitkara D. Lipid-polymer hybrid nanocarriers for delivering cancer therapeutics. J Control Release 2017; 271:60-73. [PMID: 29273320 DOI: 10.1016/j.jconrel.2017.12.016] [Citation(s) in RCA: 89] [Impact Index Per Article: 12.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/07/2017] [Revised: 12/15/2017] [Accepted: 12/17/2017] [Indexed: 01/11/2023]
Abstract
Cancer remained a major cause of death providing diversified challenges in terms of treatment including non-specific toxicity, chemoresistance and relapse. Nanotechnology- based delivery systems grabbed tremendous attention for delivering cancer therapeutics as they provide benefits including controlled drug release, improved biological half-life, reduced toxicity and targeted delivery. Majority of the nanocarriers consists of either a polymer or a lipid component along with other excipients to stabilize the colloidal system. Lipid-based systems provide advantages like better entrapment efficiency, scalability and low- cost raw materials, however, suffer from limitations including instability, a burst release of the drug, and limited surface functionalization. On the other hand, polymeric systems provide an excellent diversity of chemical modifications, stability, controlled release, however limited drug loading capacities and scale up limit their use. Hybrid nanocarriers consisting of lipid and polymer were able to overcome some of these disadvantages while retaining the advantages of both the systems. Designing a stable lipid-polymer hybrid system requires a thorough understanding of the material properties and their behavior in in vitro and in vivo environments. This review highlights the current status and future prospects of lipid-polymer hybrid systems with a particular focus on cancer nanotherapeutics.
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Affiliation(s)
- Tushar Date
- Department of Pharmacy, Birla Institute of Technology and Science-Pilani (BITS), Pilani Campus, Vidya Vihar, Pilani 333031, Rajasthan, India
| | - Vaishnavi Nimbalkar
- Department of Pharmacy, Birla Institute of Technology and Science-Pilani (BITS), Pilani Campus, Vidya Vihar, Pilani 333031, Rajasthan, India
| | - Jyostna Kamat
- Department of Pharmacy, Birla Institute of Technology and Science-Pilani (BITS), Pilani Campus, Vidya Vihar, Pilani 333031, Rajasthan, India
| | - Anupama Mittal
- Department of Pharmacy, Birla Institute of Technology and Science-Pilani (BITS), Pilani Campus, Vidya Vihar, Pilani 333031, Rajasthan, India
| | - Ram I Mahato
- Department of Pharmaceutical Sciences, College of Pharmacy, University of Nebraska Medical Center, 986125 Nebraska Medical Center, Omaha, NE 68198-6125, United States
| | - Deepak Chitkara
- Department of Pharmacy, Birla Institute of Technology and Science-Pilani (BITS), Pilani Campus, Vidya Vihar, Pilani 333031, Rajasthan, India.
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Ohkado A, Luna P, Querri A, Mercader M, Yoshimatsu S, Coprada L, Bañares R, Garfin AMC, Date T. Impact of a training course on the quality of chest radiography to diagnose pulmonary tuberculosis. Public Health Action 2015; 5:83-8. [PMID: 26400607 DOI: 10.5588/pha.14.0102] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/18/2014] [Accepted: 12/23/2014] [Indexed: 11/10/2022] Open
Abstract
SETTING Socio-economically underprivileged urban areas in the Philippines. OBJECTIVE To assess the performance of radiological technicians (RTs) 3 years after their participation in a training course to improve the quality of chest X-ray (CXR) and to test a monitoring visit after the course. DESIGN A cross-sectional and observational study including on-site monitoring of X-ray facilities in Manila and Quezon City and assessment of CXR films taken by 23 RTs who previously attended a training course in 2009 or 2010. The sum of the assessment scores for each of six assessment factors at four points, i.e., before and after the training course that had been previously analysed, and before and after the monitoring visits that were currently analysed, were compared. RESULTS Two assessment sum scores, identification mark or patient positioning, did not show significant differences. However, assessment of density, contrast, sharpness and artefact significantly improved after the training course, and before and after the monitoring visit, compared with before the training. There were no significant differences in any of the assessment factors before and after the monitoring visits. CONCLUSION The training course appears to have had a long-term effect on maintaining CXR quality. The post-training monitoring visit did not significantly improve CXR quality.
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Affiliation(s)
- A Ohkado
- Research Institute of Tuberculosis (RIT)/Japan Anti-Tuberculosis Association (JATA) Philippines Inc, Manila, The Philippines ; RIT/JATA, Kiyose, Japan
| | - P Luna
- Philippines Association of Radiologic Technologists, Manila, The Philippines
| | - A Querri
- Research Institute of Tuberculosis (RIT)/Japan Anti-Tuberculosis Association (JATA) Philippines Inc, Manila, The Philippines
| | - M Mercader
- Gat Andres Bonifacio Memorial Hospital, Manila, The Philippines
| | | | - L Coprada
- Research Institute of Tuberculosis (RIT)/Japan Anti-Tuberculosis Association (JATA) Philippines Inc, Manila, The Philippines
| | - R Bañares
- Philippines Association of Radiologic Technologists, Manila, The Philippines
| | - A M C Garfin
- National Center for Disease Prevention and Control, Department of Health, Manila, The Philippines
| | - T Date
- College of Healthcare Management, Miyama, Japan
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Inada K, Yamane T, Tokutake KI, Yokoyama KI, Mishima T, Hioki M, Narui R, Ito K, Tanigawa SI, Yamashita S, Tokuda M, Matsuo S, Shibayama K, Miyanaga S, Date T, Sugimoto KI, Yoshimura M. The role of successful catheter ablation in patients with paroxysmal atrial fibrillation and prolonged sinus pauses: outcome during a 5-year follow-up. Europace 2013; 16:208-13. [DOI: 10.1093/europace/eut159] [Citation(s) in RCA: 50] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
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Nagoshi T, Date T, Fujisaki M, Yoshino T, Sekiyama H, Ogawa K, Kayama Y, Minai K, Komukai K, Ogawa T, Yoshimura M. Biphasic action of aldosterone on Akt signaling in cardiomyocytes. Horm Metab Res 2012; 44:931-7. [PMID: 22763651 DOI: 10.1055/s-0032-1316343] [Citation(s) in RCA: 12] [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] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
Abstract
Both aldosterone and Akt signaling play pivotal roles in the pathogenesis of heart failure. However, little is known about the correlation between them. We herein investigated whether aldosterone interacts with Akt signaling in a coordinated manner in cardiomyocytes. Neonatal rat cardiomyocytes were stimulated with aldosterone for either a short (10-min) or long (24-h) time. The phosphorylation of Akt and its downstream effector, GSK3β, were transiently increased after short-term stimulation, which was blocked by either PI3K or Na(+)/H(+) exchanger inhibitors, but not by the mineralocorticoid receptor antagonist, eplerenone. Long-term stimulation also significantly increased Akt-GSK3β phosphorylation and this effect was reduced by eplerenone. Thus, these results suggest that aldosterone activates Akt signaling via a biphasic reaction that occurs through different cascades. To understand the significance of the rapid action of aldosterone, cardiomyocytes were exposed to hydrogen peroxide for from 10 to 60 min. A short-term aldosterone stimulation (for up to 30 min) significantly protected cardiomyocytes from oxidative stress-induced cellular damage. Eplerenone did not abrogate this beneficial effect, while a PI3K inhibitor did. Therefore, during the early phase, aldosterone has favorable effects on cardiomyocytes, partly by acute activation of a mineralocorticoid receptor-independent cascade through the Na(+)/H(+) exchanger, PI3K, and Akt. In contrast, its persistent activity produces pathological effects partly by chronic Akt activation in a mineralocorticoid receptor-dependent manner.
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Affiliation(s)
- T Nagoshi
- Division of Cardiology, Department of Internal Medicine, The Jikei University School of Medicine, Tokyo, Japan.
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Ohkado A, Poblete R, Mercader M, Querri A, Agujo P, Tang F, Medina A, Vianzon L, Lagahid J, Date T. Effectiveness of a training course on the quality assurance of chest radiography in the Philippines. Int J Tuberc Lung Dis 2012; 16:379-83. [PMID: 22640452 DOI: 10.5588/ijtld.11.0436] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022] Open
Abstract
SETTING Socio-economically underprivileged areas in urban settings in the Philippines. OBJECTIVE To determine the effectiveness of a training course in quality chest radiography (CXR). METHODS A descriptive, observational intervention study in which a questionnaire was administered to X-ray facility staff before training, and CXRs were reviewed before and after a training course for radiological technologists in Manila and Quezon City in the Philippines from 2009 to 2010. Course participants submitted six CXRs, each taken before and after training. Two senior radiological technologists blinded to the CXR profiles assessed the CXRs independently, using an assessment sheet developed by the Tuberculosis Coalition for Technical Assistance. RESULTS Forty radiological technologists from 10 facilities in Manila City and nine in Quezon City participated in the training. A total of 36 participants submitted the required set of CXRs. The assessment indicated that the training effectively improved the quality of CXRs in terms of identification marking (Wilcoxon matched-pairs signed-rank sum test, P = 0.00), contrast (P = 0.00), sharpness (P = 0.01), artefacts (P = 0.00), and the total score of the factors (P = 0.00). CONCLUSION The significant improvement in the total score of assessment factors strongly suggests a positive impact of the training course on improving the quality of CXRs.
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Affiliation(s)
- A Ohkado
- Research Institute of Tuberculosis/Japan Anti-Tuberculosis Association Philippines, Manila, The Philippines.
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Deshmukh A, Sharma SS, Gobal FG, Singla SS, Hebbar PH, Paydak HP, Igarashi M, Tada H, Sekiguchi Y, Yamasaki H, Kuroki K, Machino T, Yoshida K, Aonuma K, Shavadia J, Otieno H, Yonga G, Jinah A, Qvist JF, Soerensen PH, Dixen U, Ramirez-Marrero MA, Perez-Villardon B, Gaitan-Roman D, Jimenez-Navarro M, Delgado-Prieto JL, De Teresa-Galvan E, De Mora-Martin M, Deshmukh A, Hebbar PB, Wei WX, Gobal FG, Singla SS, Sharma SS, Paydak HP, Bardari S, Zecchin M, Salame' R, Vitali Serdoz L, Di Lenarda A, Guerrini N, Barbati G, Sinagra G, Hanazawa K, Kaitani K, Nakagawa Y, Lenaerts I, Driesen R, Hermida N, Heidbuchel H, Janssens S, Balligand JL, Sipido KR, Willems R, Sehra R, Krummen D, Briggs C, Narayan S, Tanaka Y, Hirao K, Nakamura T, Inaba O, Yagishita A, Higuchi K, Hachiya H, Isobe M, Kallergis E, Kanoupakis EM, Mavrakis HE, Goudis CA, Maliaraki NE, Vardas PE, Sehra R, Krummen D, Briggs C, Narayan S, Kiuchi K, Piorkowski C, Kircher S, Gaspar T, Watanabe N, Bollmann A, Hindricks G, Wauters K, Grosse A, Raffa S, Brunelli M, Geller JC, Maggioni AP, Gonzini L, Gussoni G, Vescovo G, Gulizia M, Pirelli S, Mathieu G, Di Pasquale G, Zecchin M, Bardari S, Vitali Serdoz L, Salame R, Buja G, Rovai N, Gargaro A, Sperzel J, Knops RE, Meine M, Speca G, Santini L, Haarbo J, Dubin K, Di Lenarda A, Carlson M, Garcia Quintana A, Mendoza-Lemes H, Garcia Perez L, Led Ramos S, Caballero Dorta E, Matinez De Espronceda M, Piro Mastracchio V, Serrano Arriezu L, Sciarra L, Barbati G, Marziali M, Marras E, Rebecchi M, Allocca G, Lioy E, Delise P, Calo' L, Santobuono VE, Iacoviello M, Nacci F, Magnani S, Luzzi G, Puzzovivo A, Memeo M, Quadrini F, Favale S, Trucco ME, Arce M, Palazzolo J, Uribe W, Baranchuk A, Sinagra G, Femenia F, Maggi R, Furukawa T, Croci F, Solano A, Brignole M, Lebreiro A, Sousa A, Correia AS, Lourenco P, Sakamoto T, Oliveira S, Paiva M, Freitas J, Maciel MJ, Linker N, Rieger G, Garutti C, Edvardsson N, Salguero Bodes R, De Riva Silva M, Kumagai K, Fontenla Cerezuela A, Lopez Gil M, Mejia Martinez E, Jurado Roman A, Garcia Alvarez S, Arribas Ynsaurriaga F, Petix NR, Del Rosso A, Guarnaccia V, Zipoli A, Fuke E, Rabajoli F, Foglia Manzillo G, Tolardo C, Checchinato C, Chiaravallotti S, Santarone M, Spinnler MT, Podoleanu C, Maggi R, Brignole M, Nishiuchi S, Frigy A, Dobreanu D, Ginghina C, Carasca E, Hayashi T, Miki Y, Naito S, Oshima S, Hof IE, Vonken E, Velthuis BK, Meine M, Hauer RNW, Loh KP, Na JO, Choi CU, Kim EJ, Rha SW, Park CG, Seo HS, Oh DJ, Lim HE, Igarashi M, Tada H, Sekiguchi Y, Yamasaki H, Kuroki K, Machino T, Yoshida K, Aonuma K, Wichterle D, Bulkova V, Fiala M, Chovancik J, Simek J, Peichl P, Cihak R, Kautzner J, Glick A, Viskin S, Belhassen B, Navarrete A, Conte F, Ishti A, Sai D, Moran M, Chitovova Z, Ahmed H, Mares K, Skoda J, Sediva L, Petru J, Reddy VY, Neuzil P, Schmidt M, Dorwarth U, Leber A, Wankerl M, Krieg J, Straube F, Reif S, Hoffmann E, Mikhaylov E, Tikhonenko V, Lebedev D, Lim HE, Shin SY, Yong HS, Choi CU, Choi JI, Kim SH, Kim EJ, Na JO, Matsuo S, Yamane T, Hioki M, Ito K, Narui R, Date T, Sugimoto K, Yoshimura M, Rolf S, Piorkowski C, Gaspar T, Sommer P, Hindricks G, Batalov R, Popov S, Antonchenko I, Suslova T, Fichtner S, Czudnochowsky U, Estner HL, Ammar S, Reents T, Jilek C, Hessling G, Deisenhofer I, Pokushalov E, Romanov A, Corbucci G, Artemenko S, Losik D, Shabanov V, Turov A, Elesin D, Mikhaylov E, Abramov M, Lebedev D, Piorkowski C, Sanders P, Jais P, Roberts-Thomson K, Hindricks G, Fukumoto K, Takatsuki S, Kimura T, Nishiyama N, Aizawa Y, Sato T, Miyoshi S, Fukuda K, Roux Y, Tenkorang J, Carroz P, Schlaepfer J, Pascale P, Forclaz A, Fromer M, Pruvot E, Fiala M, Wichterle D, Bulkova V, Sknouril L, Nevralova R, Chovancik J, Dorda M, Januska J, Brunelli M, Grosse A, Santi R, Wauters K, Geller C, Kumagai K, Nakamura K, Hayashi T, Kasseno K, Naito S, Sakamoto T, Oshima S, Taniguchi K, Wutzler A, Rolf S, Huemer M, Parwani A, Boldt LH, Blaschke D, Dietz R, Haverkamp W, Coutu B, Malanuk R, Ait Said M, Vicentini A, Schade S, Ando K, Rousseauplasse A, Deering T, Picarra BC, Santos AR, Dionisio P, Semedo P, Matos R, Leitao M, Jacinto A, Trinca M, Wan C, Glad J, Szymkiewicz S, Habibovic M, Versteeg H, Pelle AJM, Theuns DAMJ, Jordaens L, Pedersen SS, Pakarinen S, Toivonen L, Reif S, Schade S, Taggeselle J, Frey A, Birkenhagen A, Kohler S, Schmidt M, Maier SKG, Lobitz N, Paule S, Becher J, Mustafa G, Ibrahim A, King G, Foley B, Wilkoff B, Freedman R, Hayes D, Kalbfleisch S, Kutalek S, Schaerf R, Fazal IA, Tynan M, Plummer CJ, Mccomb JM, Oto A, Aytemir K, Yorgun H, Canpolat U, Kaya EB, Tokgozoglu L, Kabakci G, Ozkutlu H, Greenberg S, Hamati F, Styperek R, Alonso J, Peress D, Bolanos O, Augostini R, Pelini M, Zhang S, Stoycos S, Witsaman S, Mowrey K, Bremer J, Oza A, Ciconte G, Mazzone P, Paglino G, Marzi A, Vergara P, Sora N, Gulletta S, Della Bella P, Nagashima M, Goya M, Soga Y, Hiroshima K, Andou K, Hayashi K, An Y, Nobuyoshi M, Kutarski A, Malecka B, Pietura R, Osmancik P, Herman D, Stros P, Kocka V, Tousek P, Linkova H, Bortnik M, Occhetta E, Dell'era G, Degiovanni A, Plebani L, Marino PN, Gorev MV, Alimov DG, Raju P, Kully S, Ugni S, Furniss S, Lloyd G, Patel NR, Richards MW, Warren CE, Anderson MH, Hero M, Rey JL, Ouali S, Azzez S, Kacem S, Hammas S, Ben Salem H, Neffeti E, Remedi F, Boughzela E, Kronborg MB, Mortensen PT, Poulsen SH, Nielsen JC, Simantirakis EN, Kontaraki JE, Arkolaki EG, Chrysostomakis SI, Nyktari EG, Patrianakos AP, Vardas PE, Funck RC, Harink C, Mueller HH, Koelsch S, Maisch B, Bortnik M, Occhetta E, Dell'era G, Degiovanni A, Bolzani V, Marino PN, Costandi P, Shehada RE, Butala N, Coppola B, Taborsky M, Heinc P, Fedorco M, Doupal V, Di Cori A, Zucchelli G, Soldati E, Segreti L, De Lucia R, Viani S, Paperini L, Bongiorni MG, Gutleben KJ, Kranig W, Barr C, Morgenstern MM, Simon M, Dalal YH, Landolina M, Pierantozzi A, Agricola T, Lunati M, Pisano' E, Lonardi G, Bardelli G, Zucchi G, Thibault B, Dubuc M, Karst E, Ryu K, Paiement P, Carlson MD, Farazi T, Alhous H, Mont L, Porres JM, Alzueta J, Beiras X, Fernandez-Lozano I, Macias A, Ruiz R, Brugada J, Viani SM, Segreti L, Di Cori A, Zucchelli G, Paperini L, Soldati E, De Lucia R, Bongiorni MG, Seifert M, Schau T, Moeller V, Meyhoefer J, Butter C, Ganiere V, Niculescu V, Domenichini G, Stettler C, Defaye P, Burri H, Stockburger M, De Teresa E, Lamas G, Desaga M, Koenig C, Cobo E, Navarro X, Wiegand U, Blich M, Carasso S, Suleiman M, Marai I, Gepstein L, Boulos M, Sasov M, Liska B, Margitfalvi P, Malacky T, Svetlosak M, Goncalvesova E, Hatala R, Takaya Y, Noda T, Yamada Y, Okamura H, Satomi K, Shimizu W, Aihara N, Kamakura S, Proclemer A, Boveda S, Oswald H, Scipione P, Rousseauplasse A, Da Costa A, Brzozowski W, Tomaszewski A, Kutarski A, Wysokinski A, Arbelo E, Tamborero D, Vidal B, Tolosana JM, Sitges M, Matas M, Brugada J, Mont L, Botto GL, Dicandia CD, Mantica M, La Rosa C, D' Onofrio A, Molon G, Raciti G, Verlato R, Foley PWX, Chalil S, Ratib K, Smith REA, Printzen F, Auricchio A, Leyva F, Abu Sham'a R, Buber J, Luria D, Kuperstein R, Feinberg M, Granit H, Eldar M, Glikson M, Osmancik P, Herman D, Stros P, Vondrak K, Abu Sham'a R, Nof E, Kuperstein R, Carasso S, Feinberg M, Lipchenca I, Eldar M, Glikson M, Vatasescu RG, Iorgulescu C, Caldararu C, Vasile A, Bogdan S, Constantinescu D, Dorobantu M, Sakaguchi H, Miyazaki A, Yamamoto T, Fujimoto K, Ono S, Ohuchi H, Martinelli M, Martins S, Molina R, Siqueira S, Nishioka SAD, Peixoto GL, Alkmim-Teixeira R, Costa R, Versteeg H, Meine MM, Tuinenburg AE, Doevendans PA, Denollet J, Pedersen SS, Goscinska-Bis K, Zupan I, Van Der H, Anselme F, Hartog H, Block M, Borri A, Padeletti L, Toniolo M, Zanotto G, Rossi A, Raytcheva E, Tomasi L, Vassanelli C, Fernandez Lozano I, Mitroi C, Toquero Ramos J, Castro Urda V, Monivas Palomero V, Corona Figueroa A, Ruiz Bautista L, Alonso Pulpon L, Jadidi AS, Sacher F, Shah AS, Scherr D, Derval N, Hocini M, Haissaguerre M, Jais P, Castrejon Castrejon S, Largo-Aramburu C, Sachar J, Gang E, Estrada A, Doiny D, De Miguel E, Merino JL, Vergara P, Trevisi N, Ricco A, Petracca F, Baratto F, Bisceglie A, Maccabelli G, Della Bella P, El-Damaty A, Sapp J, Warren J, Macinnis P, Horacek M, Dinov B, Schoenbauer R, Piorkowski C, Bollmann A, Sommer P, Braunschweig F, Hindricks G, Arya A, Andreu D, Berruezo A, Ortiz JT, Silva E, Mont L, De Caralt TM, Fernandez-Armenta J, Brugada J, Castrejon Castrejon S, Estrada A, Doiny D, Perez-Silva A, Ortega M, Lopez-Sendon JL, Merino JL, Regoli F, Faletra F, Nucifora G, Pasotti E, Moccetti T, Klersy C, Auricchio A, Casella M, Dello Russo A, Moltrasio M, Zucchetti M, Fassini G, Di Biase L, Natale A, Tondo C, Sakamoto T, Kumagai K, Matsuhashi N, Nishiuchi S, Fuke E, Hayashi T, Naito S, Oshima S, Weig HJ, Kerst G, Weretk S, Seizer P, Gawaz MP, Schreieck J, Sarquella-Brugada G, Prada F, Brugada J, Reents T, Ammar S, Fichtner S, Salling CM, Jilek C, Kolb C, Hessling G, Deisenhofer I, Pytkowski M, Maciag A, Farkowski M, Jankowska A, Kowalik I, Kraska A, Szwed H, Maury P, Hocini M, Sacher F, Duparc A, Mondoly P, Rollin A, Jais P, Haissaguerre M, Pap R, Kohari M, Bencsik G, Makai A, Saghy L, Forster T, Ebrille E, Scaglione M, Raimondo C, Caponi D, Di Donna P, Blandino A, Delcre SDL, Gaita F, Roca Luque I, Dos LDS, Rivas NRG, Pijuan APD, Perez J, Casaldaliga J, Garcia-Dorado DGD, Moya AMM, Sato H, Yagi T, Yambe T, Streitner F, Dietrich C, Mahl E, Schoene N, Veltmann C, Borggrefe M, Kuschyk J, Sadarmin PP, Wong KCK, Rajappan K, Bashir Y, Betts TR, Svetlosak M, Leclercq C, Martins R, Hatala R, Daubert JC, Mabo P, Koide M, Hamano G, Taniguchi T, Yamato M, Sasaki N, Hirooka K, Ikeda Y, Yasumura Y, Dichtl W, Wolber T, Paoli U, Bruellmann S, Berger T, Stuehlinger M, Duru F, Hintringer F, Kanoupakis E, Mavrakis H, Kallergis E, Koutalas E, Saloustros I, Goudis C, Chlouverakis G, Vardas P, Herre JM, Saeed M, Saberi L, Neuman S, An Y, Ando K, Goya M, Nagashima M, Yamaji K, Soga Y, Iwabuchi M, Nobuyoshi M, Baranchuk A, Femenia F, Miranda Hermosilla R, Lopez Diez JC, Serra JL, Valentino M, Retyk E, Galizio N, Kwasniewski W, Filipecki A, Orszulak W, Urbanczyk-Swic D, Trusz - Gluza M, Piot O, Degand B, Da Costa A, Donofrio A, Scanu P, Quesada A, Rousseauplasse A, Padeletti L, Kloppe A, Mijic D, Bogossian H, Zarse M, Lemke B, Tyler J, Comfort G, Kalbfleisch S, Deering TF, Epstein AE, Greenberg SMG, Goldman DS, Rhude J, Majewski JP, Lelakowski J, Tomala I, Santos CM, Miranda RS, Sousa PJ, Cavaco DM, Adragao PP, Knops RE, Wilde AA, Da Costa A, Belhameche M, Hermida JS, Dovellini E, Frohlig G, Siot P, Degand B, Duray GZ, Israel CW, Brachmann J, Seidl KH, Foresti M, Birkenhauer F, Hohnloser SH, Ferreira C, Mateus P, Ribeiro H, Carvalho S, Ferreira A, Moreira J, Kadro W, Rahim H, Turkmani M, Abu Lebdeh M, Altabban A, Raimondo C, Scaglione M, Ebrille E, Caponi D, Di Donna P, Cerrato N, Delcre SDL, Gaita F, Rivera S, Scazzuso F, Albina G, Klein A, Laino R, Sammartino V, Giniger A, Kvantaliani T, Akhvlediani M, Namdar M, Steffel J, Jetzer S, Bayrak F, Chierchia GB, Jenni R, Duru F, Brugada P, Bakos Z, Medvedev M MM, Jonas Carlsson JC, Fredrik Holmqvist FH, Pyotr Platonov PP, Nurbaev T, Pirnazarov M, Nikishin A, Aagaard P, Sahlen A, Bergfeldt L, Braunschweig F, Simeonidou E, Kastellanos S, Varounis C, Michalakeas C, Koniari C, Nikolopoulou A, Anastasiou-Nana M, Furukawa Y, Yamada T, Morita T, Tanaka K, Iwasaki Y, Kawasaki M, Kuramoto Y, Fukunami M, Blanche C, Tran N, Rigamonti F, Zimmermann M, Okisheva E, Tsaregorodtsev D, Sulimov V, Novikova D, Popkova T, Udachkina E, Korsakova Y, Volkov A, Novikov A, Alexandrova E, Nasonov E, Arsenos P, Gatzoulis K, Manis G, Dilaveris P, Gialernios T, Kartsagoulis E, Asimakopoulos S, Stefanadis C, Marocolo M, Barbosa Neto O, Carvalho AC, Marques Neto SR, Mota GR, Barbosa PRB, Fernandez-Fernandez A, Manzano Fernandez S, Pastor-Perez FJ, Barquero-Perez O, Goya-Esteban R, Salar M, Rojo-Alvarez JL, Garcia-Alberola A, Takigawa M, Kawamura M, Aiba T, Kamakura S, Sakaguchi T, Itoh H, Horie M, Shimizu W, Miyazaki A, Sakaguchi H, Yamamoto T, Igarashi T, Negishi J, Toyota N, Ohuchi H, Yamada O, Arsenos P, Gatzoulis K, Manis G, Dilaveris P, Gialernios T, Papavasileiou M, Asimakopoulos S, Stefanadis C, Cabrera Bueno F, Molina Mora MJ, Alzueta Rodriguez J, Barrera Cordero A, De Teresa Galvan E, Revishvili AS, Dzhordzhikiya T, Sopov O, Simonyan G, Lyadzhina O, Fetisova E, Kalinin V, Balt JC, Steggerda RC, Boersma LVA, Wijffels MCEF, Wever EFD, Ten Berg JM, Ricci RP, Morichelli L, D'onofrio A, Zanotto G, Vaccari D, Calo' L. Poster Session 1. Europace 2011. [DOI: 10.1093/europace/eur220] [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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Tada H, Yamasaki H, Sekiguchi Y, Igarashi M, Kuroki K, Machino T, Yoshida K, Aonuma K, Heinzel FR, Forstner H, Lercher P, Bisping E, Rotman B, Fruhwald FM, Pieske BM, Dabrowski R, Kowalik I, Borowiec A, Smolis-Bak E, Trybuch A, Sosnowski C, Szwed H, Baturova MA, Lindgren A, Shubik YV, Olsson B, Platonov PG, Van Den Broek KC, Denollet J, Widdershoven J, Kupper N, Allam R, Allam RAGAB, Galal WAGDY, El-Damnhoury HAYAM, Mortada AYMAN, Jimenez-Candil J, Martin A, Hernandez J, Martin F, Gallego M, Martin-Luengo C, Quintanilla JG, Moreno Planas J, Molina-Morua R, Archondo T, Garcia-Torrent MJ, Perez-Castellano N, Macaya C, Perez-Villacastin J, Saiz J, Tobon C, Rodriguez JF, Hornero F, Ferrero JM, Ito K, Date T, Kawai M, Hioki M, Narui R, Matsuo S, Yoshimura M, Yamane T, Tabatabaei N, Lin G, Powell BD, Smairat R, Glockner JF, Brady PA, Fichtner S, Czudnochowsky U, Estner H, Reents T, Jilek C, Ammar S, Hessling G, Deisenhofer I, Shah DC, Kautzner J, Saoudi N, Herrera C, Jais P, Hindricks G, Neuzil P, Kuck KH, Wong KCK, Jones M, Qureshi N, Muthumala A, Betts TR, Bashir Y, Rajappan K, Vogtmann T, Wagner M, Schurig J, Hein P, Hamm B, Baumann G, Lembcke A, Saad B, Piwowarska W, Nessler J, Edvardsson N, Rieger G, Garutti C, Linker N, Jorge C, Silva Marques J, Veiga A, Cruz J, Slater C, Correia MJ, Sousa J, Miltenberger-Miltenyi G, Nunes Diogo A, Matic D, Mrdovic I, Stankovic G, Asanin M, Antonijevic N, Matic M, Oliveira LA, Kocev N, Vasiljevic Z, Ramirez-Marrero MA, Perez-Villardon B, Delgado-Prieto JL, Jimenez-Navarro M, De Teresa-Galvan E, De Mora-Martin M, Pietrucha AZ, Bzukala I, Elias R, Sztefko K, Wnuk M, Malek A, Piwowarska W, Nessler J, Szili-Torok T, Bauernfeind T, De Groot N, Shalganov T, Schalij M, Camiletti A, Jordaens L, Rivas N, Casaldaliga J, Roca I, Pijuan A, Perez-Rodon J, Dos L, Garcia-Dorado D, Moya A, Baruteau AE, Moura D, Behaghel A, Chatel S, Mabo P, Schott JJ, Daubert JC, Le Marec H, Probst V, Zorio Grima E, Navarro-Manchon J, Molina P, Maldonado P, Igual B, Cano O, Bermejo M, Giner J, Salvador A, Bourgonje VJA, Vos MA, Ozdemir S, Doisne N, Van Der Heyden MAG, Camanho LE, Van Veen AAB, Sipido K, Antoons G, Altieri PI, Escobales N, Crespo M, Banchs HL, Sciarra L, Bloise R, Allocca G, Bulava A, Marras E, Lioy E, Delise P, Priori S, Calo' L, Hanis J, Sitek D, Novotny A, Chik WB, Lim TW, Choon HK, See VA, Mccall R, Thomas L, Ross DL, Thomas SP, Chen J, De Bortoli A, Rossvoll O, Hoff PI, Solheim E, Sun LZ, Schuster P, Ohm OJ, Ardashev AV, Zhelyakov E, Rybachenko MS, Konev AV, Belenkov YUN, Gunawardene M, Chun KRJ, Schulte-Hahn B, Windhorst V, Kulikoglu M, Nowak B, Schmidt B, Albina GA, Rivera RS, Scazzuso F, Laino RL, Giniger GA, Arbelo E, Calvo N, Tamborero D, Andreu D, Borras R, Berruezo A, Brugada J, Mont L, Stefan L, Eisenberger M, Celentano E, Peytchev P, Bodea O, Geelen P, De Potter T, Oliveira MM, Silva N, Cunha PS, Feliciano J, Lousinha A, Toste A, Santos S, Ferreira RC, Matsuda H, Harada T, Soejima K, Ishikawa Y, Mizukoshi K, Sasaki T, Mizuno K, Miyake F, Adragao PP, Cavaco D, Miranda R, Santos M, Morgado F, Reis Santos K, Candeias R, Marcelino S, Zoppo F, Grandolino G, Zerbo F, Bertaglia E, Schlueter SM, Grebe O, Vester EG, Miracle Blanco AL, Arenal Maiz A, Atienza Fernandez F, Datino Romaniega T, Gonzalez Torrecilla E, Eidelman G, Hernandez Hernandez J, Fernandez Aviles F, Fukumoto K, Takatsuki S, Kimura T, Nishiyama N, Aizawa Y, Sato T, Miyoshi S, Fukuda K, Richter B, Gwechenberger M, Socas A, Zorn G, Albinni S, Marx M, Wojta J, Goessinger H, Deneke T, Balta O, Paesler M, Buenz K, Anders H, Horlitz M, Muegge A, Shin DI, Natsuyama K, Yamaguchi KM, Nishida YN, De Bortoli A, Ohm OJ, Hoff PI, Solheim E, Schuster P, Sun LZ, Chen J, Kosiuk J, Bode K, Arya A, Piorkowski C, Gaspar T, Sommer P, Hindricks G, Bollmann A, Wichterle D, Peichl P, Simek J, Havranek S, Bulkova V, Cihak R, Kautzner J, Jurado Roman A, Salguero Bodes R, Lopez Gil M, Fontenla Cerezuela A, De Riva Silva M, Arribas Ynsaurriaga F, Fernandez Herranz AI, De Dios Perez S, Revishvili AS, Dishekov M, Tembotova Z, Barsamyan S, Vaccari D, Alvarenga C, Jesus I, Layher J, Takahashi A, Singh N, Siot P, Elkaim JP, Savelieva I, Mcclelland L, Lovegrove A, Jones S, Camm J, Folino AF, Breda R, Calzavara P, Comisso J, Borghetti F, Iliceto S, Buja G, Mlynarski R, Mlynarska A, Sosnowski M, Wilczek J, Mabo P, Carrault G, Bordachar P, Makdissi A, Duchemin L, Alonso C, Neri G, Masaro G, Vittadello S, Vaccari D, Gardin A, Barbetta A, Di Gregorio F, Sciaraffia E, Ginks MR, Gustafsson JS, Hollmark MC, Rinaldi CA, Blomstrom Lundqvist C, Brusich S, Tomasic D, Ferek-Petric B, Mavric Z, Kutarski A, Malecka B, Kolodzinska A, Grabowski M, Dovellini EV, Giurlani L, Cerisano G, Carrabba N, Valenti R, Antoniucci D, Kolodzinska A, Kutarski A, Grabowski M, Malecka B, Opolski G, Tomassoni G, Baker J, Corbisiero R, Martin D, Niazi I, Sheppard R, Sperzel J, Gutleben K, Petru J, Sediva L, Skoda J, Neuzil P, Mazzone P, Ciconte G, Vergara P, Marzi A, Paglino G, Sora N, Gulletta S, Della Bella P, Kutarski A, Pietura R, Czajkowski M, Cabanelas N, Martins VP, Alves M, Valente FX, Marta L, Francisco A, Silva R, Ferreira Da Silva G, Huo Y, Holmqvist F, Carlson J, Arya A, Wetzel U, Hindricks G, Bollmann A, Platonov P, Nof E, Abu Shama R, Kuperstein R, Feinberg MS, Eldar M, Glikson M, Luria D, Kubus P, Materna O, Gebauer RA, Matejka T, Gebauer R, Tlaskal T, Janousek J, Muessigbrodt A, Arya A, Wetzel U, Hindricks G, Richter S, Stockburger M, Boveda S, Defaye P, Stancak Branislav P, Kaliska G, Rolando M, Moreno J, Ohlow MAG, Lauer B, Buchter B, Schreiber M, Geller JC, Val-Mejias JE, Ouali S, Azzez S, Kacem S, Ben Salem H, Hammas S, Neffeti E, Remedi F, Boughzela E, Miyazaki H, Miyanaga S, Shibayama K, Tokuda M, Narui R, Kudo T, Yamane T, Yoshimura M, Coppola B, Shehada REN, Costandi P, Healey J, Hohnloser SH, Gold MR, Capucci A, Van Gelder IC, Carlson M, Lau CP, Connolly SJ, Bogaard MD, Leenders GE, Maskara B, Tuinenburg AE, Loh P, Hauer RN, Doevendans PA, Meine M, Thibault B, Dubuc M, Karst E, Ryu K, Paiement P, Farazi T, Puetz V, Berndt C, Buchholz J, Dorszewski A, Mornos C, Cozma D, Ionac A, Petrescu L, Mornos A, Pescariu S, Puetz V, Berndt C, Buchholz J, Dorszewski A, Benser M, Roscoe G, De Jong S, Roberts G, Boileau P, Rec A, Ryu K, Folman C, Morttada A, Abd El Kader M, Samir R, Roushdy R, Khaled S, Abo El Maaty M, Van Gelder B, Houthuizen P, Bracke FA, Osca Asensi J, Tejada D, Sanchez JM, Munoz B, Cano O, Rodriguez M, Sancho-Tello MJ, Olague J, Hou W, Rosenberg S, Koh S, Poore J, Snell J, Yang M, Nirav D, Bornzin G, Deering T, Dan D, Wickliffe AC, Cazeau S, Karimzadeh K, Mukerji S, Loghin C, Kantharia B, Bogaard MD, Leenders GE, Maskara B, Tuinenburg AE, Loh P, Hauer RN, Doevendans PA, Meine M, Betts TR, Jones MA, Wong KCK, Qureshi N, Rajappan K, Bashir Y, Lamba J, Simpson CS, Redfearn DP, Michael KA, Fitzpatrick M, Baranchuk A, Heinke M, Ismer B, Kuehnert H, Surber R, Haltenberger AM, Prochnau D, Figulla HR, Delarche N, Bizeau O, Couderc P, Chapelet A, Amara W, Lazarus A, Kubus P, Krupickova S, Gebauer RA, Janousek J, Van Deursen CJM, Strik M, Vernooy K, Van Hunnik A, Kuiper M, Crijns HJGM, Prinzen FW, Islam N, Gras D, Abraham W, Calo L, Birgersdotter-Green U, Clyne C, Herre J, Sheppard R, Abraham W, Gras D, Birgersdotter-Green U, Calo L, Clyne C, Klein N, Herre J, Sheppard R, Kowalski O, Lenarczyk R, Pruszkowska P, Sokal A, Kukulski T, Zielinska T, Pluta S, Kalarus Z, Schwab JO, Gasparini M, Anselme F, Clementy J, Santini M, Martinez Ferrer J, Burrone V, Santi E, Nevzorov R, Porter A, Kusniec J, Golovchiner G, Ben-Gal T, Strasberg B, Haim M, Rordorf R, Savastano S, Sanzo A, Vicentini A, Petracci B, De Amici M, Striuli L, Landolina M, Tolosana JM, Martin AM, Hernandez-Madrid A, Macias A, Fernandez-Lozano I, Osca J, Quesada A, Mont L, Igarashi M, Tada H, Yamasaki H, Sekiguchi Y, Kuroki K, Yoshida K, Noguchi Y, Aonuma K, Shahrzad S, Karim Soleiman N, Tavoosi A, Taban S, Emkanjoo Z, Fukunaga M, Goya M, Hiroshima K, Ohe M, Hayashi K, Iwabuchi M, Nosaka H, Nobuyoshi M, Doiny D, Perez-Silva A, Castrejon Castrejon S, Estrada A, Ortega M, Lopez-Sendon JL, Merino JL, Garcia Fernandez FJ, Gallardo R, Pachon M, Almendral J, Gonzalez Torrecilla E, Martin J, Yahya D, Al-Mogheer B, Gouda S, Eweis E, El Ramly M, Abdelwahab A, Kassenberg W, Wittkampf FHM, Hof IE, Heijden JH, Neven KGEJ, Meine M, Hauer RNW, Loh P, Baratto F, Bignami E, Pappalardo F, Maccabelli G, Nicolotti D, Zangrillo A, Della Bella P, Hayashi K, Goya M, Hiroshima K, Nagashima M, An Y, Fukunaga M, Okreglicki A, Russouw C, Tilz R, Yoshiga Y, Mathew S, Fuernkranz A, Rillig A, Wissner E, Kuck KH, Ouyang F, De Sisti A, Tonet J, Gueffaf F, Amara W, Touil F, Aouate P, Hidden-Lucet F, Doiny D, Castrejon Castrejon S, Estrada A, Ortega M, Perez-Silva A, Lopez-Sendon JL, Merino JL, Makimoto H, Satomi K, Yamada Y, Okamura H, Noda T, Shimizu W, Aihara N, Kamakura S, Estrada A, Perez Silva A, Doiny D, Castrejon S, Gonzalez Vasserot M, Merino JL, Tilz R, Senges J, Brachmann J, Andresen D, Hoffmann E, Schumacher B, Willems S, Kuck KH, Reents T, Deisenhofer I, Ammar S, Springer B, Fichtner S, Jilek C, Kolb C, Hessling G, Akca F, Bauernfeind T, De Groot NMS, Schwagten B, Witsenburg M, Jordaens L, Szili-Torok T, Hata Y, Nakagami R, Watanabe T, Sato A, Watanabe H, Kabutoya T, Mituhashi T, Theuns DAMJ, Smith T, Pedersen SS, Dabiri-Abkenari L, Jordaens L, Prull MW, Unverricht S, Bittlinsky A, Wirdemann H, Sasko B, Wirdeier S, Trappe HJ, Zorio Grima E, Rueda J, Medina P, Jaijo T, Sevilla T, Osca J, Arnau MA, Salvador A, Starrenburg AH, Kraaier K, Pedersen SS, Scholten MF, Van Der Palen J, De Haan S, Commandeur J, De Boer K, Beek AM, Van Rossum AC, Allaart CP, Berne P, Porres JM, Fernandez-Lozano I, Arnaiz JA, Mont L, Berruezo A, Brugada R, Brugada J, Man S, Maan AC, Thijssen J, Van Der Wall EE, Schalij MJ, Burattini L, Burattini R, Swenne CA, Bonny A, Hidden-Lucet F, Ditah I, Larrazet F, Frank R, Fontaine G, Van Den Broek KC, Pedersen SS, Theuns DAMJ, Jordaens L, Van Der Voort PH, Alings M, Denollet J, Shimane A, Okajima K, Kanda G, Yokoi K, Yamada S, Taniguchi Y, Hayashi T, Kajiya T, Santos MC, Wright J, Betts J, Denman R, Dominguez-Perez L, Arias Palomares MA, Toquero J, Jimenez-Candil J, Olague J, Diaz-Infante E, Tercedor L, Valverde I, Miracle Blanco AL, Datino Romaniega T, Arenal Maiz A, Atienza Fernandez F, Gonzalez Torrecilla E, Eidelman G, Hernandez Hernandez J, Fernandez Aviles F, Napp A, Joosten S, Stunder D, Zink M, Marx N, Schauerte P, Silny J, Trucco ME, Arce M, Palazzolo J, Femenia F, Glad JM, Szymkiewicz SJ, Glad JM, Szymkiewicz SJ, Fernandez-Armenta J, Camara O, Mont LL, Andreu D, Diaz E, Silva E, Frangi A, Berruezo A, Brembilla-Perrot B, Laporte F, Jimenez-Candil J, Martin A, Gallego M, Morinigo J, Ledesma C, Martin-Luengo C, Hadid C, Almendral J, Ortiz M, Quesada A, Wolpert C, Cobo E, Navarro X, Arribas F, Miki Y, Naitoh S, Kumagai K, Goto K, Kaseno K, Oshima S, Taniguchi K, Rivera S, Scazzuso F, Albina G, Klein A, Laino R, Sammartino V, Giniger A, Fukumoto K, Takatsuki S, Kimura T, Nishiyama N, Aizawa Y, Sato T, Miyoshi S, Fukuda K, Muggenthaler M, Raju H, Papadakis M, Chandra N, Bastiaenen R, Behr ER, Sharma S, Samniah N, Radezishvsky Y, Omari H, Rosenschein U, Perez Riera AR, Ferreira M, Hopman WM, Mcintyre WF, Baranchuk AR, Wongcharoen W, Keanprasit K, Phrommintikul A, Chaiwarith R, Yagishita A, Hachiya H, Nakamura T, Tanaka Y, Higuchi K, Kawabata M, Hirao K, Isobe M, Havranek S, Simek J, Wichterle D, Stoickov V, Ilic S, Deljanin Ilic M, Aagaard P, Sahlen A, Bergfeldt L, Braunschweig F, Sousa A, Lebreiro A, Sousa C, Oliveira S, Correia AS, Rangel I, Freitas J, Maciel MJ, Asensio Lafuente E, Aguilera AAC, Corral MACC, Mendoza KLMC, Nava PEND, Rendon ALRC, Villegas LVC, Castillo LCM, Schaerf R, Develle R, Brembilla-Perrot B, Oliver C, Zinzius PY, Providencia RA, Botelho A, Trigo J, Nascimento J, Quintal N, Mota P, Leitao-Marques AM, Borbola J, Abraham P, Foldesi CS, Kardos A, Miranda R, Almeida S, Santos MB, Cavaco D, Quaresma R, Morgado FB, Adragao P, Fatemi M, Didier R, Le Gal G, Etienne Y, Jobic Y, Gilard M, Boschat J, Mansourati J, Zubaid M, Rashed W, Alsheikh-Ali A, Almahmeed W, Shehab A, Sulaiman K, Asaad N, Amin H, Boersma LVA, Swaans M, Post M, Rensing B, Jarverud K, Broome M, Noren K, Svensson T, Hjelm S, Hollmark M, Bjorling A, Providencia RA, Botelho A, Trigo J, Nascimento J, Quintal N, Mota P, Leitao-Marques AM, Maeda K, Takagi M, Suzuki K, Tatsumi H, Yoshiyama M, Simeonidou E, Michalakeas C, Kastellanos S, Varounis C, Nikolopoulou A, Koniari C, Anastasiou-Nana M, Furukawa T, Maggi R, Bertolone C, Fontana D, Brignole M, Pietrucha AZ, Wnuk M, Bzukala I, Mroczek-Czernecka D, Konduracka E, Kruszelnicka O. Poster Session 4. Europace 2011. [DOI: 10.1093/europace/eur231] [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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Yamashita T, Inoue H, Okumura K, Kodama I, Aizawa Y, Atarashi H, Ohe T, Ohtsu H, Kato T, Kamakura S, Kumagai K, Kurachi Y, Koretsune Y, Saikawa T, Sakurai M, Sato T, Sugi K, Nakaya H, Hirai M, Hirayama A, Fukatani M, Mitamura H, Yamazaki T, Watanabe E, Ogawa S, Katoh T, Igawa O, Matsumoto N, Yamashita T, Kaneko Y, Watanabe E, Ogawa S, Osaka T, Fujii E, Niwano S, Yoshioka K, Kato M, Okazaki O, Kusano K, Okuyama Y, Furushima H, Suzuki M, Noda T, Kawara T, Sato T, Kamakura S, Endoh Y, Kumagai K, Hiyoshi Y, Ishiyama T, Ohtsuka T, Matsumoto M, Chishaki A, Shinohara T, Shirayama T, Koretsune Y, Yokoyama E, Ajiki K, Fujio K, Sugi K, Yamakawa T, Yusu S, Inoue H, Kawamura Y, Hayano M, Date T, Mizusawa Y, Kobayashi Y, Satomi K, Imai Y, Atarashi H, Fukunami M, Yokoshiki H, Betsuyaku T, Okumura K, Takeda H, Matsumoto K, Okishige K, Tagawa M, Hirai M, Okazaki H. Randomized trial of angiotensin II-receptor blocker vs. dihydropiridine calcium channel blocker in the treatment of paroxysmal atrial fibrillation with hypertension (J-RHYTHM II Study). Europace 2010; 13:473-9. [DOI: 10.1093/europace/euq439] [Citation(s) in RCA: 91] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
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Tokuda M, Yamane T, Matsuo S, Ito K, Narui R, Hioki M, Tanigawa SI, Nakane T, Yamashita S, Inada K, Shibayama K, Miyanaga S, Yoshida H, Miyazaki H, Date T, Yokoo T, Yoshimura M. Relationship between renal function and the risk of recurrent atrial fibrillation following catheter ablation. Heart 2010; 97:137-42. [DOI: 10.1136/hrt.2010.200824] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/03/2022] Open
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Matsuo S, Yamane T, Tokuda M, Date T, Hioki M, Narui R, Ito K, Yamashita S, Hama Y, Nakane T, Inada K, Shibayama K, Miyanaga S, Yoshida H, Miyazaki H, Abe K, Sugimoto KI, Taniguchi I, Yoshimura M. Prospective randomized comparison of a steerable versus a non-steerable sheath for typical atrial flutter ablation. Europace 2010; 12:402-409. [DOI: 10.1093/europace/eup434] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 08/30/2023] Open
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Date T, Yamane T, Inada K, Matsuo S, Miyanaga S, Sugimoto K, Shibayama K, Taniguchi I, Mochizuki S. Plasma brain natriuretic peptide concentrations in patients undergoing pulmonary vein isolation. Heart 2006; 92:1623-7. [PMID: 16740921 PMCID: PMC1861210 DOI: 10.1136/hrt.2005.083022] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.2] [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: 11/03/2022] Open
Abstract
OBJECTIVE To examine whether raised plasma brain natriuretic peptide (BNP) concentrations decrease after successful pulmonary vein isolation (PVI) in patients with atrial fibrillation (AF). METHODS 53 patients (mean age 53 years) with drug-refractory, paroxysmal lone AF underwent segmental ostial PVI. Blood samples were collected before and after PVI. BNP concentrations were determined by immunoassays. RESULTS Median plasma BNP concentrations were significantly higher in patients with lone AF than in controls (patients with supraventricular tachyarrhythmias, n = 21) (64.6 (71.9) v 13.9 (7.8) pg/ml, p < 0.01). AF recurred in 21 patients after the initial PVI procedure (recurrent AF group), and the others were free from AF without antiarrhythmic drugs (non-recurrent AF group). BNP concentrations were significantly decreased by PVI in the non-recurrent AF group (38.9 (39.1) to 18.3 (16.1) pg/ml, p < 0.01) but not in the recurrent AF group. CONCLUSIONS Raised plasma BNP concentrations decreased after successful segmental ostial PVI in patients with AF.
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Affiliation(s)
- T Date
- Division of Cardiology, Department of Internal Medicine, Jikei University School of Medicine, Tokyo, Japan.
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Nakada Y, Date T, Mochizuki S. Biventricular involvement in cardiac sarcoidosis. Heart 2005; 91:1388. [PMID: 16230435 PMCID: PMC1769165 DOI: 10.1136/hrt.2005.064089] [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] [Subscribe] [Scholar Register] [Indexed: 11/04/2022]
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Semmelhack MF, Gallagher JJ, Minami T, Date T. The enol-keto trigger in initiating arene diradical formation in calicheamicin/esperamicin analogs. J Am Chem Soc 2002. [DOI: 10.1021/ja00077a079] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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Luo Z, Garron T, Palasis M, Lu H, Belanger AJ, Scaria A, Vincent KA, Date T, Akita GY, Cheng SH, Barry J, Gregory RJ, Jiang C. Enhancement of Fas ligand-induced inhibition of neointimal formation in rabbit femoral and iliac arteries by coexpression of p35. Hum Gene Ther 2001; 12:2191-202. [PMID: 11779403 DOI: 10.1089/10430340152710531] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Abstract
Adenovirus-mediated gene transfer of Fas ligand (FasL) inhibits neointimal formation in balloon-injured rat carotid arteries. Vascular smooth muscle (VSM) cells coexpressing murine FasL and p35, a baculovirus gene that inhibits caspase activity, are not susceptible to FasL-mediated apoptosis in vitro but are capable of inducing apoptosis of VSM cells that do not express p35. We reasoned that coexpression of p35 in FasL-transduced VSM cells in vivo would promote their survival, enhance FasL-induced apoptosis of adjacent VSM cells, and thereby facilitate a greater inhibition of neointimal formation. In balloon-injured rabbit femoral arteries, either Ad2/FasL/p35 or Ad2/FasL was infused into the injured site and withdrawn 20 min later. Both vectors induced a dose-dependent reduction (p < 0.05) of the neointima-to-media ratio when assessed 14 days later. However, Ad2/FasL/p35 exhibited a significantly greater inhibition of neointimal formation than Ad2/FasL. In a more clinically relevant model of restenosis, rabbit iliac arteries were injured with an angioplasty catheter under fluoroscopic guidance. Adenoviral vectors were delivered locally to the injured site over a period of 2 min, using a porous infusion balloon catheter. Twenty-eight days after gene transfer angiographic and histologic assessments indicated a significant (p < 0.05) inhibition of iliac artery lumen stenosis and neointimal formation by Ad2/FasL/p35 (5 x 10(11) particles per artery). The extent of inhibition was comparable to that achieved with Ad2/TK, an adenoviral vector encoding thymidine kinase (5 x 10(11) particles per artery) and coadministration of ganciclovir for 7 days. These data suggest that coexpression of p35 in FasL-transduced VSM cells is more potent at inhibiting neointimal formation and as such represents an improved gene therapy approach for restenosis.
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Affiliation(s)
- Z Luo
- Genzyme Corporation, 31 New York Avenue, Framingham, MA 01701, USA
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Kato T, Furusaka A, Miyamoto M, Date T, Yasui K, Hiramoto J, Nagayama K, Tanaka T, Wakita T. Sequence analysis of hepatitis C virus isolated from a fulminant hepatitis patient. J Med Virol 2001. [PMID: 11424123 DOI: 10.1002/jmv.1055.] [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] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Abstract
Although hepatitis C virus (HCV) is a major cause of non-A non-B hepatitis, its pathogenic role in fulminant hepatitis remains controversial. A 32-year-old man contracted hepatitis. Serum ALT concentration was reached to 6,970 IU/L, the lowest prothrombin time value was 16% and jaundice and stage II encephalopathy were developed. HCV RNA was detected in this patient by reverse transcription polymerase chain reaction in sera at the acute phase, and it was undetectable during the remission phase when anti-HCV was found. The entire genome of infected HCV was recovered, cloned, and sequenced from this patient, and compared with the clones of six other chronic hepatitis patients. Phylogenetic analysis revealed a clustering around genotype 2a and a deviation from the other 2a chronic hepatitis strains. Calculating the genetic distance in each subgenomic region revealed that the 5'untranslated region (5'UTR), core, nonstructural (NS) 3, and NS5A were severely deviated. Of 20 clones of the hypervariable region (HVR), 17 showed an identical sequence with the others showing a difference of only one amino acid. HCV was isolated from a fulminant hepatitis patient and its entire genome was recovered; a clustering around genotype 2a was observed, but the sequence deviated especially in 5'UTR, core, NS3, and NS5A; and monoclonality of the HVR sequence was found not only in the fulminant hepatitis patient but in a certain percentage of chronic hepatitis patients.
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Affiliation(s)
- T Kato
- Department of Microbiology, Tokyo Metropolitan Institute of Neuroscience, Tokyo, Japan
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35
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Kato T, Furusaka A, Miyamoto M, Date T, Yasui K, Hiramoto J, Nagayama K, Tanaka T, Wakita T. Sequence analysis of hepatitis C virus isolated from a fulminant hepatitis patient. J Med Virol 2001; 64:334-9. [PMID: 11424123 DOI: 10.1002/jmv.1055] [Citation(s) in RCA: 198] [Impact Index Per Article: 8.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
Although hepatitis C virus (HCV) is a major cause of non-A non-B hepatitis, its pathogenic role in fulminant hepatitis remains controversial. A 32-year-old man contracted hepatitis. Serum ALT concentration was reached to 6,970 IU/L, the lowest prothrombin time value was 16% and jaundice and stage II encephalopathy were developed. HCV RNA was detected in this patient by reverse transcription polymerase chain reaction in sera at the acute phase, and it was undetectable during the remission phase when anti-HCV was found. The entire genome of infected HCV was recovered, cloned, and sequenced from this patient, and compared with the clones of six other chronic hepatitis patients. Phylogenetic analysis revealed a clustering around genotype 2a and a deviation from the other 2a chronic hepatitis strains. Calculating the genetic distance in each subgenomic region revealed that the 5'untranslated region (5'UTR), core, nonstructural (NS) 3, and NS5A were severely deviated. Of 20 clones of the hypervariable region (HVR), 17 showed an identical sequence with the others showing a difference of only one amino acid. HCV was isolated from a fulminant hepatitis patient and its entire genome was recovered; a clustering around genotype 2a was observed, but the sequence deviated especially in 5'UTR, core, NS3, and NS5A; and monoclonality of the HVR sequence was found not only in the fulminant hepatitis patient but in a certain percentage of chronic hepatitis patients.
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Affiliation(s)
- T Kato
- Department of Microbiology, Tokyo Metropolitan Institute of Neuroscience, Tokyo, Japan
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36
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Matsui T, Tanihara K, Date T. Expression of unphosphorylated form of human double-stranded RNA-activated protein kinase in Escherichia coli. Biochem Biophys Res Commun 2001; 284:798-807. [PMID: 11396973 DOI: 10.1006/bbrc.2001.5039] [Citation(s) in RCA: 30] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Interferon (IFN)-inducible, double-stranded (dsRNA)-activated protein kinase (PKR) is a key mediator of the antiviral and antiproliferative effects of IFN. PKR is present within cells in a latent state. In response to binding dsRNA, the enzyme becomes activated, causing autophosphorylation and an increase in specific kinase activity. In order to study PKR and its inhibitors, a large amount of the enzyme in its latent, unphosphorylated state is required. When PKR is fused to glutathione S-transferase (GST-PKR) and the fusion protein is expressed in Escherichia coli, the PKR obtained is fully activated by autophosphorylation. Therefore, we have developed an expression plasmid in which both GST-PKR and bacteriophage lambda protein phosphatase (lambda-PPase) genes were placed downstream of a T7 promoter. After induction of expression, unphosphorylated GST-PKR was obtained in good yield, and purified to near homogeneity. The purified enzyme has dsRNA-dependent activation and phosphorylates the translation initiation factor eIF2 alpha. Using the recombinant protein, we analyzed the inhibition mechanisms of two viral inhibitors, vaccinia virus K3L protein and adenovirus virus-associated RNA I (VAI RNA). K3L inhibited both autophosphorylation of PKR and phosphorylation of eIF2 alpha, whereas VAI RNA inhibited only autophosphorylation. The separation of autophosphorylation and catalytic activity shows that the recombinant PKR is useful in analyzing the functions of PKR, its inhibitors, and its regulatory molecules. The coexpression system of protein kinase with lambda-PPase described here will be applicable to obtaining unphosphorylated and unactivated forms of other protein kinases.
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Affiliation(s)
- T Matsui
- Department of Biochemistry, Kanazawa Medical University, Uchinada, Ishikawa 920-0293, Japan
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37
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Guan D, Date T. [Determination of DNA binding domains in hepatitis C virus core protein]. Zhonghua Gan Zang Bing Za Zhi 2001; 9:160-2. [PMID: 11412392] [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: 02/20/2023]
Abstract
OBJECTIVE To determine the DNA binding domain in hepatitis C virus core protein and otelucidate the significance of binding. METHODS Segments of hepatitis C virus core protein were expressed in E.coli as fusion forms with glutathion S-transferase (GST). The core proteins were immobilized in SDS-PAGE gel after removing SDS from the gel by washing. (32)P-ATP labeled oligonucleotides were electrophoresed through the gel in TAE buffer. The binding of DNA with core protein was detected by autoradiography. RESULTS There were at least two DNA binding domains in the HCV core protein, the first locating at 10~16aa and the second at 46-70aa. The second region was divided into three adjacent parts, which could bind core protein independently. Core protein bound to single strand DNA as well as to double strand DNA without sequence specificity. CONCLUSIONS DNA binding regions of HCV core protein locate at its N-terminus. The binding regions of HCV core protein overlap its nucleus transfer signals and they bind to target DNA unselectively, suggesting a possible mechanism for its multifunction. The result provides basic data for understanding the biological function of HCV core protein.
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Affiliation(s)
- D Guan
- Department of Infectious Disease, 202nd Hospital of PLA, Shenyang 110003, China
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Matsumura E, Morita Y, Date T, Tsujibo H, Yasuda M, Okabe T, Ishida N, Inamori Y. Cytotoxicity of the hinokitiol-related compounds, gamma-thujaplicin and beta-dolabrin. Biol Pharm Bull 2001; 24:299-302. [PMID: 11256489 DOI: 10.1248/bpb.24.299] [Citation(s) in RCA: 30] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Gamma-thujaplicin and beta-dolabrin, the constituents of the wood of Thujopsis dolabrata Sieb. et Zucc. var. hondai showed strong in vitro cytotoxic effects against the human stomach cancer cell lines KATO-III and Ehrlich's ascites carcinoma. The cytotoxic effects of the two compounds against both tumor cell lines were clear when cell growth was measured by the 3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide (MTT) method. Gamma-thujaplicin and beta-dolabrin at 0.32 microg/ml inhibited cell growth of human stomach cancer KATO-III by 85 and 67%, and Ehrlich's ascites carcinoma by 91 and 75%, respectively. There is no large difference in cytotoxicity between these compounds, but the activity of gamma-thujaplicin was slightly more potent than that of beta-dolabrin. On the other hand, hinokitiol acetate did not show a cytotoxic effect, suggesting that at least a part of the mechanism of the cytotoxic effect of hinokitiol-related compounds is due to metal chelation between the carbonyl group at C-1 and the hydroxyl group at C-2 in the tropolone skeleton of these molecules. The acute toxicities [50% lethal dose (LD50) value: intraperitoneal injection, Van der Waedem] of gamma-thujaplicin and beta-dolabrin in mice were 277 mg/kg and 232 mg/kg, respectively.
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Affiliation(s)
- E Matsumura
- Osaka University of Pharmaceutical Sciences, Japan
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Ogihara M, Aikawa K, Suzuki T, Yanagida T, Kushida N, Yamaguchi O, Shiraiwa Y, Kumakawa K, Koseki K, Ichijo S, Date T, Kurosu S, Takeuchi M, Yokoyama J, Murakami F, Itoh K, Noguchi M. [Significance of interferon alpha therapy for advanced renal cell carcinoma. Fukushima Renal Cancer Study Group]. Gan To Kagaku Ryoho 2000; 27:1533-9. [PMID: 11015998] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/17/2023]
Abstract
We ranked prognostic factors to retrospectively evaluate the clinical significance of interferon alpha (IFN-alpha) therapy in patients with Robson stage IVB renal cell carcinoma. A total of 44 Robson stage IVB renal cancer patients were divided into 2 groups, one with more than 6 months administration of IFN-alpha (3-7 times a week: group A) and another without any IFN-alpha administration. The distribution of these 2 groups was not randomized. In addition to IFN-alpha therapy, survival was analyzed with respect to performance status (PS), mass reductive nephrectomy, concomitant use of other cytotoxic therapies, the number of metastatic organs, growth type, site of metastasis and the period of diagnosis, using a multivariate method with Cox proportional hazards regression. The multivariate analysis showed administration of IFN-alpha to be the most significant factor influencing a good prognosis. Improved survival was also significantly correlated with slow growing type and good PS. Among group A, a significant favorable prognosis was obtained in patients with the responses of no change (NC), partial response (PR) and complete remission (CR) 6 months after initiating administration of IFN-alpha, as well as with good PS and a slow growing type carcinoma. We conclude that IFN-alpha therapy might improve the prognosis of patients with Robson stage IVB renal cell carcinoma, especially, in cases when a greater than NC response is obtained after 6 months administration of IFN-alpha.
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Affiliation(s)
- M Ogihara
- Dept. of Urology, Fukushima Medical University School of Medicine
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Mizushina Y, Ohkubo T, Date T, Yamaguchi T, Saneyoshi M, Sugawara F, Sakaguchi K. Mode analysis of a fatty acid molecule binding to the N-terminal 8-kDa domain of DNA polymerase beta. A 1:1 complex and binding surface. J Biol Chem 1999; 274:25599-607. [PMID: 10464295 DOI: 10.1074/jbc.274.36.25599] [Citation(s) in RCA: 53] [Impact Index Per Article: 2.1] [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: 11/06/2022] Open
Abstract
We reported previously that long-chain fatty acids are potent inhibitors of mammalian DNA polymerase beta. At present, based on information available from the NMR structure of the N-terminal 8-kDa domain, we examined the structural interaction with the 8-kDa domain using two species, C(18)-linoleic acid (LA) or C(24)-nervonic acid (NA). In the 8-kDa domain with LA or NA, the structure that forms the interaction interface included helix-1, helix-2, helix-4, the three turns (residues 1-13, 48-51, and 79-87) and residues adjacent to an Omega-type loop connecting helix-1 and helix-2 of the same face. No significant shifts were observed for any of the residues on the opposite side of the 8-kDa domain. The NA interaction interface on the amino acid residues of the 8-kDa domain fragment was mostly the same as that of LA, except that the shifted cross-peaks of Leu-11 and Thr-79 were significantly changed between LA and NA. The 8-kDa domain bound to LA or NA as a 1:1 complex with a dissociation constant (K(D)) of 1.02 or 2.64 mM, respectively.
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Affiliation(s)
- Y Mizushina
- Department of Applied Biological Science, Science University of Tokyo, 2641 Yamazaki, Noda, Chiba 278-8510, Japan
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41
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Ogawa H, Takusagawa F, Wakaki K, Kishi H, Eskandarian MR, Kobayashi M, Date T, Huh NH, Pitot HC. Rat liver serine dehydratase. Bacterial expression and two folding domains as revealed by limited proteolysis. J Biol Chem 1999; 274:12855-60. [PMID: 10212273 DOI: 10.1074/jbc.274.18.12855] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.5] [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: 11/06/2022] Open
Abstract
A pCW vector harboring rat liver serine dehydratase cDNA was expressed in Escherichia coli. The expressed level was about 5-fold higher in E. coli BL21 than in JM109 cell extract; the former lacked two kinds of proteases. Immunoblot analysis revealed the occurrence of a derivative other than serine dehydratase in the JM109 cell extract. The recombinant enzyme was purified to homogeneity. Staphylococcus aureus V8 protease and trypsin cleaved the enzyme at Glu-206 and Lys-220, respectively, with a concomitant loss of enzyme activity. Spectrophotometrically, the nicked enzyme showed a approximately 50% reduced capacity for binding of the coenzyme pyridoxal phosphate and no spectral change of circular dichroism in the region at 300-480 nm, whereas circular dichroism spectra of both enzymes in the far-UV region were similar, suggesting that proteolysis impairs the coenzyme binding without an accompanying gross change of the secondary structure. Whereas the nicked enzyme behaved like the intact enzyme on Sephadex G-75 column chromatography, it was dissociated into two fragments on the column containing 6 M urea. Upon the removal of urea, both fragments spontaneously refolded. These results suggest that serine dehydratase consists of two folding domains connected by a region that is very susceptible to proteases.
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Affiliation(s)
- H Ogawa
- Department of Biochemistry, Faculty of Medicine, Toyama Medical and Pharmaceutical University, Toyama 930-0194, Japan.
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Iwabuchi K, Li B, Massa HF, Trask BJ, Date T, Fields S. Stimulation of p53-mediated transcriptional activation by the p53-binding proteins, 53BP1 and 53BP2. J Biol Chem 1998; 273:26061-8. [PMID: 9748285 DOI: 10.1074/jbc.273.40.26061] [Citation(s) in RCA: 152] [Impact Index Per Article: 5.8] [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: 11/06/2022] Open
Abstract
p53 is a tumor suppressor protein that controls cell proliferation by regulating the expression of growth control genes. In a previous study, we identified two proteins, 53BP1 and 53BP2, that are able to bind to wild type but not to mutant p53 via the DNA-binding domain of p53. We isolated cDNAs expressing a full-length human 53BP1 clone, which predicts a protein of 1972 residues that can be detected in the H358 human lung carcinoma cell line. The 53BP1 and 53BP2 genes were mapped to chromosomes 15q15-21 and 1q41-42, respectively. Immunofluorescence studies showed three types of staining patterns for 53BP1 as follows: both cytoplasmic and nuclear, homogeneous nuclear, and a nuclear dot pattern. In contrast, 53BP2 localized exclusively to the cytoplasm, and this pattern did not change upon coexpression of wild type p53. Although our previous study revealed that p53 is not able to bind simultaneously to either 53BP1 or 53BP2 and to DNA carrying a consensus binding site, both 53BP1 and 53BP2 enhanced p53-mediated transcriptional activation and induced the expression of a p53-dependent protein, suggesting that these proteins might function in signal transduction pathways to promote p53 activity.
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Affiliation(s)
- K Iwabuchi
- Department of Biochemistry, Kanazawa Medical University, Ishikawa 920-02, Japan
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Yamakawa A, Kameoka Y, Hashimoto K, Yoshitake Y, Nishikawa K, Tanihara K, Date T. cDNA cloning and chromosomal mapping of genes encoding novel protein kinases termed PKU-alpha and PKU-beta, which have nuclear localization signal. Gene X 1997; 202:193-201. [PMID: 9427565 DOI: 10.1016/s0378-1119(97)00495-2] [Citation(s) in RCA: 9] [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: 02/05/2023] Open
Abstract
We have cloned cDNAs for novel serine/threonine protein kinases (PK), termed PKU-alpha and PKU-beta, by screening a bacteriophage expression library for kinase activity. Sequence analysis of PKU-alpha and PKU-beta genes revealed that their open reading frames (ORF) were 2151 and 2361 nucleotides (nt) encoding polypeptides of 717 and 787 amino acid (aa) residues, respectively. The deduced aa sequences of PKU-alpha and PKU-beta contained typical serine/threonine PK domains at the C-terminal region and were 86% identical to each other, indicating that they belong to the same PK family. Northern analysis reveals that they are expressed in nearly all human tissues and in cultured cells. The genes for PKU-alpha and PKU-beta were mapped to chromosome 17q23 and 8p12-p22, respectively, by fluorescence in situ hybridization. The proteins encoded by both cDNAs contain a putative nuclear localization signal (NLS) in their N-terminal region. These signals are likely to function in nuclear localization. Glutathione S-transferase (GST)-fusions to regions of PKU-alpha and beta containing the NLS were efficiently localized to the nucleus. In addition, PKU-beta transiently expressed in COS-1 cells was predominantly nuclear. PKU-alpha and PKU-beta differ: a consensus sequence for a nt binding motif is present near the NLS of PKU-beta. These results suggest that PKU-alpha and beta may phosphorylate serine and/or threonine residues on similar proteins, but their activities are regulated through distinct interactions with a nuclear component.
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Affiliation(s)
- A Yamakawa
- Department of Biochemistry, Kanazawa Medical University, Uchinada, Ishikawa, Japan
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Ogawa H, Gomi T, Takata Y, Date T, Fujioka M. Recombinant expression of rat glycine N-methyltransferase and evidence for contribution of N-terminal acetylation to co-operative binding of S-adenosylmethionine. Biochem J 1997; 327 ( Pt 2):407-12. [PMID: 9359408 PMCID: PMC1218808 DOI: 10.1042/bj3270407] [Citation(s) in RCA: 29] [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: 02/05/2023]
Abstract
An expression vector was constructed that produced rat glycine N-methyltransferase in Escherichia coli. Recombinant glycine N-methyltransferase was purified to homogeneity by DEAE-cellulose and gel-filtration chromatography, with a yield of more than 80 mg of pure enzyme from a 1 litre culture. HPLC of tryptic peptides and analysis of isolated peptides showed that the recombinant enzyme was structurally identical with the liver enzyme except for the absence of N-terminal blocking. The alpha-amino group of rat glycine N-methyltransferase is blocked by acetylation [Ogawa, Konishi, Takata, Nakashima and Fujioka (1987) Eur. J. Biochem. 168, 141-151]. In contrast with the liver enzyme, which shows sigmoidal kinetics toward S-adenosylmethionine at all pH values tested [Ogawa and Fujioka (1982) J. Biol. Chem. 257, 3447-3452], the recombinant enzyme exhibited hyperbolic kinetics at low pH and sigmoidal rate behaviour at high pH. The Hill coefficient increased with increasing pH and a pKa of 8.11 was obtained in this transition. The values of Vmax and Km for glycine were not different between the two enzymes. These results suggest that elimination of the positive charge at the N-terminal end either by acetylation or deprotonation is required for co-operative behaviour.
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Affiliation(s)
- H Ogawa
- Department of Biochemistry, Faculty of Medicine Toyama Medical and Pharmaceutical University, Sugitani, Toyama 930-01, Japan
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45
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Asai Y, Nonaka N, Nishio M, Okamura K, Date T, Sugita T, Ohnuki T, Komatsubara S. TMC-2A, -2B and -2C, new dipeptidyl peptidase IV inhibitors produced by Aspergillus oryzae A374. II. Isolation and structure determination. J Antibiot (Tokyo) 1997; 50:653-8. [PMID: 9315077 DOI: 10.7164/antibiotics.50.653] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Abstract
New dipeptidyl peptidase IV inhibitors, TMC-2A, -2B, and -2C, were isolated from the fermentation broth of Aspergillus oryzae A374. On the basis of chemical, spectroscopic and X-ray crystallographic analyses, their structures were established to be peptide-like compounds composed of three moieties, L-tryptophan, mono- or dihydroxy-L-leucine and highly substituted isoquinoline.
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Affiliation(s)
- Y Asai
- Lead Generation Research Laboratory at Toda, Tanabe Seiyaku Co., Ltd., Saitama, Japan
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46
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Inoue H, Konda M, Hashiyama T, Otsuka H, Watanabe A, Gaino M, Takahashi K, Date T, Okamura K, Takeda M, Narita H, Murata S, Odawara A, Sasaki H, Nagao T. Synthesis biological evaluation of alkyl, alkoxy, alkylthio, or amino-substituted 2,3-dihydro-1,5-benzothiazepin-4(5H)-ones. Chem Pharm Bull (Tokyo) 1997; 45:1008-26. [PMID: 9214707 DOI: 10.1248/cpb.45.1008] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
Abstract
2,3-Dihydro-1,5-benzothiazepin-4(5H)-ones substituted with an alkyl, alkoxy, alkylthio, hydroxy, or amino group on the fused benzene ring of the 1,5-benzothiazepine skeleton were synthesized and their vasodilating, antihypertensive, and platelet aggregation-inhibitory activities were investigated. (-)-cis-3-Acetoxy-5-[2-(di-methylamino) ethyl]-2,3-dihydro-8-methyl-2-(4-methylphenyl)-1,5-benzothiazepin- 4(5H)-one ((-)-13e) was selected for further studies as a potent inhibitor of platelet aggregation.
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Affiliation(s)
- H Inoue
- Organic Chemistry Research Laboratory Tanabe Seiyaku Co., Ltd., Saitama Japan
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47
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Date T, Redpath TW, Bussell DM. A bandwidth indicator for magnetic resonance imagers. Med Phys 1997; 24:733-5. [PMID: 9167164 DOI: 10.1118/1.597994] [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] [Subscribe] [Scholar Register] [Indexed: 02/04/2023] Open
Abstract
Signal-to-noise ratios in magnetic resonance imaging are crucial in determining image quality, and dependent on a number of factors, one being the signal bandwidth per pixel. Not all manufacturers clearly state the bandwidth per pixel used for all sequences. A small battery-powered portable device is described which produces bright sharp lines on the magnetic resonance image at 10 kHz intervals in the frequency encoding direction. The bandwidth per pixel can then easily be calculated using electronic distance callipers, provided the image matrix and field of view are known. The device is expected to be especially of value when acceptance testing on poorly documented imaging systems.
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Affiliation(s)
- T Date
- Department of Bio-Medical Physics and Bio-Engineering, University of Aberdeen, Foresterhill, United Kingdom
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48
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Yamada N, Tanihara K, Takada A, Yorihuzi T, Tsutsumi M, Shimomura H, Tsuji T, Date T. Genetic organization and diversity of the 3' noncoding region of the hepatitis C virus genome. Virology 1996; 223:255-61. [PMID: 8806561 DOI: 10.1006/viro.1996.0476] [Citation(s) in RCA: 106] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
Abstract
The 3' noncoding region (3' NCR) of the hepatitis C virus (HCV) genome contained in viral particles was analyzed by an RNA linker ligation followed by reverse transcription-polymerase chain reaction. Sequence analysis of the amplified fragment from four strains, including different genotypes 1b, 2b, 3a, and 3b indicated that the 3' NCR is composed of between 200 and 235 nts. The sequence of the 3' NCR consists of a type-specific region (immediately following the termination codon), a poly(U) stretch, a C(U)n-repeat, and highly conserved region termed the core element. The poly(U) stretch and C(U)n-repeat regions varied in length and in sequence among different genotypes. Core elements having putative secondary structure consisted of 98 or 100 nts and were highly conserved in all genotypes. Most of the nt changes found in different genotypes did not affect the secondary structure of the core elements, suggesting that this region may play an important role in replication, stabilization of the HCV RNA, and/or packaging of the genome. Most of the HCV-1b strains carried two U residues at the 3' end of the core element, while the minor HCV-1b strains had no U residues, demonstrating that there are two variants in type 1b strains. Amplification of the core element using linker-primed cDNA was comparable with that using the 3' proximal core element-primed cDNA, indicating that the 3' end of HCV genome was terminated by an OH group.
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Affiliation(s)
- N Yamada
- Department of Biochemistry, Kanazawa Medical University, Ishikawa, Japan
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Bunnak J, Hamana H, Ogino Y, Saheki T, Yamagishi A, Oshima T, Date T, Shinozawa T. Orotate phosphoribosyltransferase from Thermus thermophilus: overexpression in Escherichia coli, purification and characterization. J Biochem 1995; 118:1261-7. [PMID: 8720144 DOI: 10.1093/oxfordjournals.jbchem.a125016] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/01/2023] Open
Abstract
Orotate phosphoribosyltransferase (OPRTase, EC2.4.2.10) plays a role in de novo synthesis of pyrimidine nucleotide and transfers orotate to 5-phosphoribosyl-1-pyrophosphate (PRPP) to form orotidine-5'-monophosphate (OMP). To obtain heat-stable OPRTase and to elucidate the mechanism of heat stability, this enzyme from Thermus thermophilus was expressed in Escherichia coli and purified. The pyrE gene of T. thermophilus which encodes OPRTase, contains an open reading frame of 549 base pairs with 69% G+C content. Since this gene expressed itself inefficiently in E. coli, the 5' and 3' ends of the coding regions were replaced with synonymous codons which contain more A+T and corresponds to major codons for E. coli. Introduction of the modified gene fragments into a plasmid having a tac promoter resulted in production of a polypeptide of molecular weight (M(r)) 20,000 in the presence of isopropyl-beta-D-thiogalactopyranoside (IPTG) in E. coli. This protein represented as much as 16% of the bacterial total protein and showed the OPRTase activity. Three purification steps, consisting of heat treatment at 65 degrees C, 40% ammonium sulfate fractionation, and KCl gradient elution from DEAE-Sephadex A-50, resulted in highly purified single polypeptide. The optimum activity of the purified OPRTase was observed at 150 mM KCl, pH 9.0, 75-80 degrees C, and in the presence of 100 microM PRPP. The activation energy of this enzyme reaction was 20.3 kJ/mol. The Km of this enzyme for orotate as a substrate was 75 microM and the maximum specific activity was 300 units/mg protein under the optimum conditions. The purified OPRTase was stable for 20 min at 85 degrees C.
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Affiliation(s)
- J Bunnak
- Department of Biological and Chemical Engineering, Gunma University
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