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Han A, Mukha D, Chua V, Purwin TJ, Tiago M, Modasia B, Baqai U, Aumiller JL, Bechtel N, Hunter E, Danielson M, Terai M, Wedegaertner PB, Sato T, Landreville S, Davies MA, Kurtenbach S, Harbour JW, Schug ZT, Aplin AE. Co-Targeting FASN and mTOR Suppresses Uveal Melanoma Growth. Cancers (Basel) 2023; 15:3451. [PMID: 37444561 PMCID: PMC10341317 DOI: 10.3390/cancers15133451] [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] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/07/2023] [Revised: 06/25/2023] [Accepted: 06/27/2023] [Indexed: 07/15/2023] Open
Abstract
Uveal melanoma (UM) displays a high frequency of metastasis; however, effective therapies for metastatic UM are limited. Identifying unique metabolic features of UM may provide a potential targeting strategy. A lipid metabolism protein expression signature was induced in a normal choroidal melanocyte (NCM) line transduced with GNAQ (Q209L), a driver in UM growth and development. Consistently, UM cells expressed elevated levels of fatty acid synthase (FASN) compared to NCMs. FASN upregulation was associated with increased mammalian target of rapamycin (mTOR) activation and sterol regulatory element-binding protein 1 (SREBP1) levels. FASN and mTOR inhibitors alone significantly reduced UM cell growth. Concurrent inhibition of FASN and mTOR further reduced UM cell growth by promoting cell cycle arrest and inhibiting glucose utilization, TCA cycle metabolism, and de novo fatty acid biosynthesis. Our findings indicate that FASN is important for UM cell growth and co-inhibition of FASN and mTOR signaling may be considered for treatment of UM.
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Affiliation(s)
- Anna Han
- Department of Pharmacology, Physiology, and Cancer Biology, Thomas Jefferson University, Philadelphia, PA 19107, USA; (A.H.); (V.C.); (T.J.P.); (M.T.); (U.B.); (E.H.)
- Department of Food Science and Human Nutrition, Jeonbuk National University, Jeonju 54896, Jeollabuk-do, Republic of Korea
| | - Dzmitry Mukha
- Molecular and Cellular Oncogenesis Program, The Wistar Institute, Philadelphia, PA 19104, USA; (D.M.); (Z.T.S.)
| | - Vivian Chua
- Department of Pharmacology, Physiology, and Cancer Biology, Thomas Jefferson University, Philadelphia, PA 19107, USA; (A.H.); (V.C.); (T.J.P.); (M.T.); (U.B.); (E.H.)
| | - Timothy J. Purwin
- Department of Pharmacology, Physiology, and Cancer Biology, Thomas Jefferson University, Philadelphia, PA 19107, USA; (A.H.); (V.C.); (T.J.P.); (M.T.); (U.B.); (E.H.)
| | - Manoela Tiago
- Department of Pharmacology, Physiology, and Cancer Biology, Thomas Jefferson University, Philadelphia, PA 19107, USA; (A.H.); (V.C.); (T.J.P.); (M.T.); (U.B.); (E.H.)
| | - Bhavik Modasia
- Department of Pharmacology, Physiology, and Cancer Biology, Thomas Jefferson University, Philadelphia, PA 19107, USA; (A.H.); (V.C.); (T.J.P.); (M.T.); (U.B.); (E.H.)
| | - Usman Baqai
- Department of Pharmacology, Physiology, and Cancer Biology, Thomas Jefferson University, Philadelphia, PA 19107, USA; (A.H.); (V.C.); (T.J.P.); (M.T.); (U.B.); (E.H.)
| | - Jenna L. Aumiller
- Department of Biochemistry and Molecular Biology, Thomas Jefferson University, Philadelphia, PA 19107, USA; (J.L.A.); (P.B.W.)
| | - Nelisa Bechtel
- Department of Pharmacology, Physiology, and Cancer Biology, Thomas Jefferson University, Philadelphia, PA 19107, USA; (A.H.); (V.C.); (T.J.P.); (M.T.); (U.B.); (E.H.)
| | - Emily Hunter
- Department of Pharmacology, Physiology, and Cancer Biology, Thomas Jefferson University, Philadelphia, PA 19107, USA; (A.H.); (V.C.); (T.J.P.); (M.T.); (U.B.); (E.H.)
| | - Meggie Danielson
- Department of Medical Oncology, Thomas Jefferson University, Philadelphia, PA 19107, USA; (M.D.); (M.T.); (T.S.)
| | - Mizue Terai
- Department of Medical Oncology, Thomas Jefferson University, Philadelphia, PA 19107, USA; (M.D.); (M.T.); (T.S.)
| | - Philip B. Wedegaertner
- Department of Biochemistry and Molecular Biology, Thomas Jefferson University, Philadelphia, PA 19107, USA; (J.L.A.); (P.B.W.)
| | - Takami Sato
- Department of Medical Oncology, Thomas Jefferson University, Philadelphia, PA 19107, USA; (M.D.); (M.T.); (T.S.)
| | - Solange Landreville
- Department of Ophthalmology and Otorhinolaryngology-Cervical-Facial Surgery, Faculty of Medicine, Université Laval, Québec, QC G1V 0A6, Canada;
| | - Michael A. Davies
- Department of Melanoma Medical Oncology, The University of Texas MD Anderson Cancer Center, Houston, TX 77030, USA;
| | - Stefan Kurtenbach
- Bascom Palmer Eye Institute, University of Miami Miller School of Medicine, Miami, FL 33101, USA; (S.K.); (J.W.H.)
- Sylvester Comprehensive Cancer Center, University of Miami Miller School of Medicine, Miami, FL 33101, USA
- Interdisciplinary Stem Cell Institute, University of Miami Miller School of Medicine, Miami, FL 33101, USA
| | - J. William Harbour
- Bascom Palmer Eye Institute, University of Miami Miller School of Medicine, Miami, FL 33101, USA; (S.K.); (J.W.H.)
- Sylvester Comprehensive Cancer Center, University of Miami Miller School of Medicine, Miami, FL 33101, USA
- Interdisciplinary Stem Cell Institute, University of Miami Miller School of Medicine, Miami, FL 33101, USA
- Department of Ophthalmology, Harold C. Simmons Comprehensive Cancer Center, University of Texas Southwestern Medical Center, Dallas, TX 75390, USA
| | - Zachary T. Schug
- Molecular and Cellular Oncogenesis Program, The Wistar Institute, Philadelphia, PA 19104, USA; (D.M.); (Z.T.S.)
| | - Andrew E. Aplin
- Department of Pharmacology, Physiology, and Cancer Biology, Thomas Jefferson University, Philadelphia, PA 19107, USA; (A.H.); (V.C.); (T.J.P.); (M.T.); (U.B.); (E.H.)
- Sidney Kimmel Cancer Center, Thomas Jefferson University, Philadelphia, PA 19107, USA
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2
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Jiang W, Luo X, Wei L, Yuan S, Cai J, Jiang X, Hu Y. The Sustainability of Energy Conversion Inhibition for Tumor Ferroptosis Therapy and Chemotherapy. Small 2021; 17:e2102695. [PMID: 34350694 DOI: 10.1002/smll.202102695] [Citation(s) in RCA: 24] [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] [Subscribe] [Scholar Register] [Received: 05/07/2021] [Indexed: 06/13/2023]
Abstract
The hyperactive energy metabolism mostly contributes the tumor cells growth and proliferation. Herein, the intelligent nanoparticles (P-B-D NPs) obtained by loading BAY-876 and doxorubicin (Dox)-Duplex into nanoparticles composed of disulfide bond (SS) containing polymer are reported, which provide an efficient resistance of tumor cells energy metabolism and tumor growth to conquer malignant tumor. In response to the reducing microenvironment of tumor tissue, the SS bond can be disintegrated by intracellular glutathione to block the synthesis of lipid repair enzyme-glutathione peroxidase 4 for ferroptosis therapy. More importantly, the released BAY-876 can inhibit the functionality of glucose transporter 1, restricting the glucose uptake of tumor cells to a low energy metabolism status. Meanwhile, Dox-Duplex can interact with ATP to reduce intracellular ATP content and release Dox to kill tumor cells. Collectively, this work offers a new idea for restricting tumor cells energy metabolism to inhibit their proliferation.
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Affiliation(s)
- Wei Jiang
- Institute of Materials Engineering, College of Engineering and Applied Sciences, Nanjing University, Jiangsu, 210093, China
| | - Xingyu Luo
- Institute of Materials Engineering, College of Engineering and Applied Sciences, Nanjing University, Jiangsu, 210093, China
| | - Lulu Wei
- Department of Chemistry, University of South Florida, 4202 E. Fowler Ave, Tampa, FL, 33620, USA
| | - Shanmei Yuan
- Nantong Vocational University, Nantong, 226019, China
| | - Jianfeng Cai
- Department of Chemistry, University of South Florida, 4202 E. Fowler Ave, Tampa, FL, 33620, USA
| | - Xiqun Jiang
- Department of Polymer Science & Engineering, College of Chemistry & Chemical Engineering, Nanjing University, Nanjing, 210093, China
| | - Yong Hu
- Institute of Materials Engineering, College of Engineering and Applied Sciences, Nanjing University, Jiangsu, 210093, China
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3
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Li H, Li M, Fu J, Ao H, Wang W, Wang X. Enhancement of oral bioavailability of quercetin by metabolic inhibitory nanosuspensions compared to conventional nanosuspensions. Drug Deliv 2021; 28:1226-1236. [PMID: 34142631 PMCID: PMC8218931 DOI: 10.1080/10717544.2021.1927244] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022] Open
Abstract
Quercetin-loaded nanosuspensions (Que-NSps) added metabolic inhibitors were evaluated as drug delivery system to promote the oral bioavailability of quercetin. Que-NSps were prepared respectively using d-alpha tocopherol acid polyethylene glycol succinate (TPGS) or Soybean Lecithin (SPC) as stabilizer. On the basis, Piperine (Pip) or sodium oleate (SO) was, respectively, encapsulated in Que-NSps as phase II metabolic inhibitors. The resulting Que-NSps all displayed a mean particle size of about 200 nm and drug loading content was in the range of 22.3–27.8%. The release of quercetin from Que-NSps was slow and sustained. After oral administration of 50 mg/kg different Que-NSps, the levels of free quercetin in plasma were significantly promoted, the concentration of quercetin metabolites (isorhamnetin and quercetin 3-O-β-d-Glucuronide) were decreased. The absolute bioavailability was, respectively 15.55%, 6.93%, 12.38%, and 23.58% for TPGS-Que-NSps, TPGS-SO-Que-NSps, SPC-Que-NSps, and SPC-Pip-Que-NSps, and 3.61% for quercetin water suspension. SPC-Pip-Que-NSps turned out to an ideal nanocarrier combined nano drug delivery system together with metabolic inhibitor to promote oral absorption of quercetin.
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Affiliation(s)
- Haowen Li
- Institute of Medicinal Plant Development, Chinese Academy of Medical Sciences & Peking Union Medical College, Haidian District, Beijing, PR China
| | - Manzhen Li
- Institute of Medicinal Plant Development, Chinese Academy of Medical Sciences & Peking Union Medical College, Haidian District, Beijing, PR China
| | - Jingxin Fu
- Institute of Medicinal Plant Development, Chinese Academy of Medical Sciences & Peking Union Medical College, Haidian District, Beijing, PR China
| | - Hui Ao
- Institute of Medicinal Plant Development, Chinese Academy of Medical Sciences & Peking Union Medical College, Haidian District, Beijing, PR China
| | - Weihua Wang
- Institute of Medicinal Plant Development, Chinese Academy of Medical Sciences & Peking Union Medical College, Haidian District, Beijing, PR China
| | - Xiangtao Wang
- Institute of Medicinal Plant Development, Chinese Academy of Medical Sciences & Peking Union Medical College, Haidian District, Beijing, PR China
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Attalah Nee Rezkallah C, Thongkum A, Zhu C, Chen QM. Resveratrol for protection against statin toxicity in C2C12 and H9c2 cells. J Biochem Mol Toxicol 2020; 34:e22484. [PMID: 32196851 DOI: 10.1002/jbt.22484] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [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: 08/20/2019] [Revised: 01/02/2020] [Accepted: 02/14/2020] [Indexed: 01/01/2023]
Abstract
Statins are among the most commonly prescribed drugs for the treatment of high blood cholesterol. Myotoxicity of statins in certain individuals is often a severe side effect leading to withdrawal. Using C2C12 and H9c2 cells, both exhibiting characteristics of skeletal muscle cells, we addressed whether resveratrol (RSV) can prevent statin toxicity. Statins decreased cell viability in a dose and time-dependent manner. Among the five statins tested, atorvastatin, simvastatin, lovastatin, pravastatin, and fluvastatin, simvastatin is the most toxic one. Simvastatin at 10 µM caused about 65% loss of metabolic activity as measured by 3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide assays in C2C12 cells or H9c2 cells. Inhibition of metabolic activity correlates with an increase in caspase activity. RSV was found to protect H9c2 cells from simvastatin-induced activation of caspase-3/7. However, such protection was not found in C2C12 cells. This cell type-dependent effect of RSV adds to the complexity in muscle cell toxicity of statins.
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Affiliation(s)
| | - Angkana Thongkum
- Department of Pharmacology, College of Medicine, University of Arizona, Tucson, Arizona
| | - Chao Zhu
- Department of Pharmacology, College of Medicine, University of Arizona, Tucson, Arizona.,Department of Pharmacy Practice and Science, College of Pharmacy, University of Arizona, Tucson, Arizona
| | - Qin M Chen
- Department of Pharmacology, College of Medicine, University of Arizona, Tucson, Arizona.,Department of Pharmacy Practice and Science, College of Pharmacy, University of Arizona, Tucson, Arizona
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Wilson CS, Bach MD, Ashkavand Z, Norman KR, Martino N, Adam AP, Mongin AA. Metabolic constraints of swelling-activated glutamate release in astrocytes and their implication for ischemic tissue damage. J Neurochem 2019; 151:255-272. [PMID: 31032919 DOI: 10.1111/jnc.14711] [Citation(s) in RCA: 16] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/20/2018] [Revised: 03/01/2019] [Accepted: 04/10/2019] [Indexed: 12/20/2022]
Abstract
Volume-regulated anion channel (VRAC) is a glutamate-permeable channel that is activated by physiological and pathological cell swelling and promotes ischemic brain damage. However, because VRAC opening requires cytosolic ATP, it is not clear if and how its activity is sustained in the metabolically compromised CNS. In the present study, we used cultured astrocytes - the cell type which shows prominent swelling in stroke - to model how metabolic stress and changes in gene expression may impact VRAC function in the ischemic and post-ischemic brain. The metabolic state of primary rat astrocytes was modified with chemical inhibitors and examined using luciferin-luciferase ATP assays and a Seahorse analyzer. Swelling-activated glutamate release was quantified with the radiotracer D-[3 H]aspartate. The specific contribution of VRAC to swelling-activated glutamate efflux was validated by RNAi knockdown of the essential subunit, leucine-rich repeat-containing 8A (LRRC8A); expression levels of VRAC components were measured with qRT-PCR. Using this methodology, we found that complete metabolic inhibition with the glycolysis blocker 2-deoxy-D-glucose and the mitochondrial poison sodium cyanide reduced astrocytic ATP levels by > 90% and abolished glutamate release from swollen cells (via VRAC). When only mitochondrial respiration was inhibited by cyanide or rotenone, the intracellular ATP levels and VRAC activity were largely preserved. Bypassing glycolysis by providing the mitochondrial substrates pyruvate and/or glutamine led to partial recovery of ATP levels and VRAC activity. Unexpectedly, the metabolic block of VRAC was overridden when ATP-depleted cells were exposed to extreme cell swelling (≥ 50% reduction in medium osmolarity). Twenty-four hour anoxic adaptation caused a moderate reduction in the expression levels of the VRAC component LRRC8A, but no significant changes in VRAC activity. Overall, our findings suggest that (i) astrocytic VRAC activity and metabolism can be sustained by low levels of glucose and (ii) the inhibitory influence of diminishing ATP levels and the stimulatory effect of cellular swelling are the two major factors that govern VRAC activity in the ischemic brain.
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Affiliation(s)
- Corinne S Wilson
- Department of Neuroscience and Experimental Therapeutics, Albany Medical College, Albany, New York, USA
| | - Martin D Bach
- Department of Neuroscience and Experimental Therapeutics, Albany Medical College, Albany, New York, USA
| | - Zahra Ashkavand
- Department of Regenerative and Cancer Cell Biology, Albany Medical College, Albany, New York, USA
| | - Kenneth R Norman
- Department of Regenerative and Cancer Cell Biology, Albany Medical College, Albany, New York, USA
| | - Nina Martino
- Department of Molecular and Cellular Physiology, Albany Medical College, Albany, New York, USA
| | - Alejandro P Adam
- Department of Molecular and Cellular Physiology, Albany Medical College, Albany, New York, USA
| | - Alexander A Mongin
- Department of Neuroscience and Experimental Therapeutics, Albany Medical College, Albany, New York, USA
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Treinys R, Kanaporis G, Fischmeister R, Jurevičius J. Metabolic Inhibition Induces Transient Increase of L-type Ca 2+ Current in Human and Rat Cardiac Myocytes. Int J Mol Sci 2019; 20:ijms20061501. [PMID: 30917498 PMCID: PMC6471217 DOI: 10.3390/ijms20061501] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/19/2019] [Revised: 03/15/2019] [Accepted: 03/23/2019] [Indexed: 01/17/2023] Open
Abstract
Metabolic inhibition is a common condition observed during ischemic heart disease and heart failure. It is usually accompanied by a reduction in L-type Ca2+ channel (LTCC) activity. In this study, however, we show that metabolic inhibition results in a biphasic effect on LTCC current (ICaL) in human and rat cardiac myocytes: an initial increase of ICaL is observed in the early phase of metabolic inhibition which is followed by the more classical and strong inhibition. We studied the mechanism of the initial increase of ICaL in cardiac myocytes during β-adrenergic stimulation by isoprenaline, a non-selective agonist of β-adrenergic receptors. The whole-cell patch⁻clamp technique was used to record the ICaL in single cardiac myocytes. The initial increase of ICaL was induced by a wide range of metabolic inhibitors (FCCP, 2,4-DNP, rotenone, antimycin A). In rat cardiomyocytes, the initial increase of ICaL was eliminated when the cells were pre-treated with thapsigargin leading to the depletion of Ca2+ from the sarcoplasmic reticulum (SR). Similar results were obtained when Ca2+ release from the SR was blocked with ryanodine. These data suggest that the increase of ICaL in the early phase of metabolic inhibition is due to a reduced calcium dependent inactivation (CDI) of LTCCs. This was further confirmed in human atrial myocytes where FCCP failed to induce the initial stimulation of ICaL when Ca2+ was replaced by Ba2+, eliminating CDI of LTCCs. We conclude that the initial increase in ICaL observed during the metabolic inhibition in human and rat cardiomyocytes is a consequence of an acute reduction of Ca2+ release from SR resulting in reduced CDI of LTCCs.
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Affiliation(s)
- Rimantas Treinys
- Institute of Cardiology, Lithuanian University of Health Sciences, Kaunas LT-50162, Lithuania.
| | - Giedrius Kanaporis
- Institute of Cardiology, Lithuanian University of Health Sciences, Kaunas LT-50162, Lithuania.
| | - Rodolphe Fischmeister
- INSERM UMR-S 1180, Univ Paris-Sud, Université Paris-Saclay, Châtenay-Malabry F-92296, France.
| | - Jonas Jurevičius
- Institute of Cardiology, Lithuanian University of Health Sciences, Kaunas LT-50162, Lithuania.
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Mačianskienė R, Martišienė I, Navalinskas A, Treinys R, Andriulė I, Jurevičius J. Mechanism of Action Potential Prolongation During Metabolic Inhibition in the Whole Rabbit Heart. Front Physiol 2018; 9:1077. [PMID: 30140239 PMCID: PMC6095129 DOI: 10.3389/fphys.2018.01077] [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] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/04/2018] [Accepted: 07/19/2018] [Indexed: 11/24/2022] Open
Abstract
Myocardial ischemia is associated with significant changes in action potential (AP) duration, which has a biphasic response to metabolic inhibition. Here, we investigated the mechanism of initial AP prolongation in whole Langendorff-perfused rabbit heart. We used glass microelectrodes to record APs transmurally. Simultaneously, optical AP, calcium transient (CaT), intracellular pH, and magnesium concentration changes were recorded using fluorescent dyes. The fluorescence signals were recorded using an EMCCD camera equipped with emission filters; excitation was induced by LEDs. We demonstrated that metabolic inhibition by carbonyl cyanide-p-trifluoromethoxyphenylhydrazone (FCCP) resulted in AP shortening preceded by an initial prolongation and that there were no important differences in the response throughout the wall of the heart and in the apical/basal direction. AP prolongation was reduced by blocking the ICaL and transient outward potassium current (Ito) with diltiazem (DTZ) and 4-aminopyridine (4-AP), respectively. FCCP, an uncoupler of oxidative phosphorylation, induced reductions in CaTs and intracellular pH and increased the intracellular Mg2+ concentration. In addition, resting potential depolarization was observed, clearly indicating a decrease in the inward rectifier K+ current (IK1) that can retard AP repolarization. Thus, we suggest that the main currents responsible for AP prolongation during metabolic inhibition are the ICaL, Ito, and IK1, the activities of which are modulated mainly by changes in intracellular ATP, calcium, magnesium, and pH.
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Affiliation(s)
- Regina Mačianskienė
- Institute of Cardiology, Lithuanian University of Health Sciences, Kaunas, Lithuania
| | - Irma Martišienė
- Institute of Cardiology, Lithuanian University of Health Sciences, Kaunas, Lithuania
| | - Antanas Navalinskas
- Institute of Cardiology, Lithuanian University of Health Sciences, Kaunas, Lithuania
| | - Rimantas Treinys
- Institute of Cardiology, Lithuanian University of Health Sciences, Kaunas, Lithuania
| | - Inga Andriulė
- Institute of Cardiology, Lithuanian University of Health Sciences, Kaunas, Lithuania
| | - Jonas Jurevičius
- Institute of Cardiology, Lithuanian University of Health Sciences, Kaunas, Lithuania
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Gong EC, Chea S, Balupuri A, Kang NS, Chin YW, Choi YH. Enzyme Kinetics and Molecular Docking Studies on Cytochrome 2B6, 2C19, 2E1, and 3A4 Activities by Sauchinone. Molecules 2018; 23:molecules23030555. [PMID: 29498658 PMCID: PMC6017976 DOI: 10.3390/molecules23030555] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/08/2018] [Revised: 02/26/2018] [Accepted: 02/28/2018] [Indexed: 02/06/2023] Open
Abstract
Sauchinone, an active lignan isolated from the aerial parts of Saururus chinensis (Saururaceae), exhibits anti-inflammatory, anti-obesity, anti-hyperglycemic, and anti-hepatic steatosis effects. As herb–drug interaction (HDI) through cytochrome P450s (CYPs)-mediated metabolism limits clinical application of herbs and drugs in combination, this study sought to explore the enzyme kinetics of sauchinone towards CYP inhibition in in vitro human liver microsomes (HLMs) and in vivo mice studies and computational molecular docking analysis. In in vitro HLMs, sauchinone reversibly inhibited CYP2B6, 2C19, 2E1, and 3A4 activities in non-competitive modes, showing inhibition constant (Ki) values of 14.3, 16.8, 41.7, and 6.84 μM, respectively. Also, sauchinone time-dependently inhibited CYP2B6, 2E1 and 3A4 activities in vitro HLMs. Molecular docking study showed that sauchinone could be bound to a few key amino acid residues in the active site of CYP2B6, 2C19, 2E1, and 3A4. When sibutramine, clopidogrel, or chlorzoxazone was co-administered with sauchinone to mice, the systemic exposure of each drug was increased compared to that without sauchinone, because sauchinone reduced the metabolic clearance of each drug. In conclusion, when sauchinone was co-treated with drugs metabolized via CYP2B6, 2C19, 2E1, or 3A4, sauchinone–drug interactions occurred because sauchinone inhibited the CYP-mediated metabolic activities.
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Affiliation(s)
- Eun Chae Gong
- College of Pharmacy and Intergrated Research Institute for Drug Development, Dongguk University-Seoul, 32 Dongguk-lo, Ilsandong-gu, Goyang, Gyeonggi-do 10326, Korea; (E.C.G.); (S.C.); (Y.-W.C.)
| | - Satya Chea
- College of Pharmacy and Intergrated Research Institute for Drug Development, Dongguk University-Seoul, 32 Dongguk-lo, Ilsandong-gu, Goyang, Gyeonggi-do 10326, Korea; (E.C.G.); (S.C.); (Y.-W.C.)
| | - Anand Balupuri
- Graduate School of New Drug Discovery and Development, Chungnam National University, Daejeon 305-764, Korea; (A.B.); (N.S.K)
| | - Nam Sook Kang
- Graduate School of New Drug Discovery and Development, Chungnam National University, Daejeon 305-764, Korea; (A.B.); (N.S.K)
| | - Young-Won Chin
- College of Pharmacy and Intergrated Research Institute for Drug Development, Dongguk University-Seoul, 32 Dongguk-lo, Ilsandong-gu, Goyang, Gyeonggi-do 10326, Korea; (E.C.G.); (S.C.); (Y.-W.C.)
| | - Young Hee Choi
- College of Pharmacy and Intergrated Research Institute for Drug Development, Dongguk University-Seoul, 32 Dongguk-lo, Ilsandong-gu, Goyang, Gyeonggi-do 10326, Korea; (E.C.G.); (S.C.); (Y.-W.C.)
- Correspondence: ; Tel.: +82-31-961-5212
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Hossain MA, Tran T, Chen T, Mikus G, Greenblatt DJ. Inhibition of human cytochromes P450 in vitro by ritonavir and cobicistat. J Pharm Pharmacol 2017; 69:1786-1793. [PMID: 28960344 DOI: 10.1111/jphp.12820] [Citation(s) in RCA: 28] [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] [Received: 07/13/2017] [Accepted: 08/26/2017] [Indexed: 12/18/2022]
Abstract
OBJECTIVES Ritonavir and cobicistat are strong inhibitors of human cytochrome P450-3A (CYP3A) isoforms, and are used clinically as pharmacokinetic boosting agents for other antiretroviral drugs. Data reported by the manufacturer suggest that cobicistat is a more selective inhibitor of CYP3A than ritonavir. However, this claim has not been validated in clinical studies. This study evaluated the in-vitro inhibitory potency of ritonavir and cobicistat vs a series of human CYP isoforms. METHOD The model system utilized human liver microsomes and isoform-selective index substrates. KEY FINDINGS Ritonavir and cobicistat both were strong inhibitors of CYP3A4, with IC50 values of 0.014 and 0.032 μm, respectively. A component of inhibition was time-dependent (mechanism-based). Neither drug meaningfully inhibited CYP1A2 (IC50 > 150 μm). CYP2B6, CYP2C9, CYP2C19 and CYP2D6 were inhibited by both drugs, but with IC50 values exceeding 6 μm. CONCLUSIONS Consistent with previous reports, both ritonavir and cobicistat were highly potent inhibitors of CYP3A. Both drugs were weaker inhibitors of other human CYPs, with IC50 values at least two orders of magnitude higher. There was no evidence of a meaningful difference in selectivity between the two drugs.
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Affiliation(s)
- Md Amin Hossain
- Graduate Program in Pharmacology and Drug Development, Sackler School of Graduate Biomedical Sciences, Tufts University School of Medicine, Boston, MA, USA
| | - Timothy Tran
- Graduate Program in Pharmacology and Drug Development, Sackler School of Graduate Biomedical Sciences, Tufts University School of Medicine, Boston, MA, USA
| | - Tianmeng Chen
- Graduate Program in Pharmacology and Drug Development, Sackler School of Graduate Biomedical Sciences, Tufts University School of Medicine, Boston, MA, USA
| | - Gerd Mikus
- Department of Clinical Pharmacology and Pharmacoepidemiology, University of Heidelberg, Heidelberg, Germany
| | - David J Greenblatt
- Graduate Program in Pharmacology and Drug Development, Sackler School of Graduate Biomedical Sciences, Tufts University School of Medicine, Boston, MA, USA.,Department of Integrative Physiology and Pathobiology, Tufts University School of Medicine, Boston, MA, USA
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Baartscheer A, Schumacher CA, Coronel R, Fiolet JWT. The Driving Force of the Na/Ca-Exchanger during Metabolic Inhibition. Front Physiol 2011; 2:10. [PMID: 21483726 PMCID: PMC3070476 DOI: 10.3389/fphys.2011.00010] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/27/2011] [Accepted: 02/28/2011] [Indexed: 11/13/2022] Open
Abstract
OBJECTIVE Metabolic inhibition causes a decline in mechanical performance and, if prolonged, myocardial contracture and cell death. The decline in mechanical performance is mainly due to altered intracellular calcium handling, which is under control of the Na(+)/Ca(2+)-exchanger (NCX) The driving force of the NCX (ΔG(ncx)) determines the activity of NCX. The aim of this study was to describe the relation between ΔG(ncx) and calcium homeostasis during metabolic inhibition. METHODS In left ventricular rabbit myocytes, during metabolic inhibition (2 mmol/L sodium cyanide), sodium ([Na(+)](i)), calcium ([Ca(2+);](i)), and action potentials were determined with SBFI, indo-1, and the patch clamp technique. Changes of ΔG(ncx) were calculated. RESULTS During metabolic inhibition: The first 8 min [Na(+)](i) remained constant, systolic calcium decreased from 532 ± 28 to 82 ± 13 nM, diastolic calcium decreased from 121 ± 12 to 36 ± 10 nM and the sarcoplasmic reticulum (SR) calcium content was depleted for 85 ± 3%. After 8 min [Na(+);](i) and diastolic calcium started to increase to 30 ± 1.3 mmol/L and 500 ± 31 nM after 30 min respectively. The action potential duration shortened biphasically. In the first 5 min it shortened from 225 ± 12 to 153 ± 11 ms and remained almost constant until it shortened again after 10 min. After 14 min action potential and calcium transients disappeared due to unexcitability of the myocytes. This resulted in an increased of the time average of ΔG(ncx) from 6.2 ± 0.2 to 7.7 ± 0.3 kJ/mol during the first 3 min, where after it decreased and became negative after about 15 min. CONCLUSION Metabolic inhibition caused an early increase of ΔG(ncx) caused by shortening of the action potential. The increase of ΔG(ncx) contributed to decrease of diastolic calcium, calcium transient amplitude, SR calcium content, and contractility. The increase of diastolic calcium started after ΔG(ncx) became lower than under aerobic conditions.
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Affiliation(s)
- Antonius Baartscheer
- Experimental Cardiology, Heart Failure Research Center, Academic Medical Center, University of AmsterdamAmsterdam, Netherlands
| | - Cees A. Schumacher
- Experimental Cardiology, Heart Failure Research Center, Academic Medical Center, University of AmsterdamAmsterdam, Netherlands
| | - Ruben Coronel
- Experimental Cardiology, Heart Failure Research Center, Academic Medical Center, University of AmsterdamAmsterdam, Netherlands
| | - Jan W. T. Fiolet
- Experimental Cardiology, Heart Failure Research Center, Academic Medical Center, University of AmsterdamAmsterdam, Netherlands
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Borchert GH, Yang C, Kolár F. Mitochondrial BKCa channels contribute to protection of cardiomyocytes isolated from chronically hypoxic rats. Am J Physiol Heart Circ Physiol 2011; 300:H507-13. [PMID: 21112945 PMCID: PMC3044046 DOI: 10.1152/ajpheart.00594.2010] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/18/2010] [Accepted: 11/22/2010] [Indexed: 01/24/2023]
Abstract
Chronic hypoxia protects the heart against injury caused by acute oxygen deprivation, but its salutary mechanism is poorly understood. The aim was to find out whether cardiomyocytes isolated from chronically hypoxic hearts retain the improved resistance to injury and whether the mitochondrial large-conductance Ca2+-activated K+ (BKCa) channels contribute to the protective effect. Adult male rats were adapted to continuous normobaric hypoxia (inspired O2 fraction 0.10) for 3 wk or kept at room air (normoxic controls). Myocytes, isolated separately from the left ventricle (LVM), septum (SEPM), and right ventricle, were exposed to 25-min metabolic inhibition with sodium cyanide, followed by 30-min reenergization (MI/R). Some LVM were treated with either 30 μM NS-1619 (BKCa opener), or 2 μM paxilline (BKCa blocker), starting 25 min before metabolic inhibition. Cell injury was detected by Trypan blue exclusion and lactate dehydrogenase (LDH) release. Chronic hypoxia doubled the number of rod-shaped LVM and SEPM surviving the MI/R insult and reduced LDH release. While NS-1619 protected cells from normoxic rats, it had no additive salutary effect in the hypoxic group. Paxilline attenuated the improved resistance of cells from hypoxic animals without affecting normoxic controls; it also abolished the protective effect of NS-1619 on LDH release in the normoxic group. While chronic hypoxia did not affect protein abundance of the BKCa channel regulatory β1-subunit, it markedly decreased its glycosylation level. It is concluded that ventricular myocytes isolated from chronically hypoxic rats retain the improved resistance against injury caused by MI/R. Activation of the mitochondrial BKCa channel likely contributes to this protective effect.
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Affiliation(s)
- Gudrun H Borchert
- Centre for Cardiovascular Research, Institute of Physiology, Academy of Sciences of the Czech Republic, Prague, Czech Republic.
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Ho JCS, Wu S, Kam KWL, Sham JSK, Wong TM. Effects of pharmacological preconditioning with U50488H on calcium homeostasis in rat ventricular myocytes subjected to metabolic inhibition and anoxia. Br J Pharmacol 2002; 137:739-48. [PMID: 12411403 PMCID: PMC1573565 DOI: 10.1038/sj.bjp.0704945] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.2] [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] [Indexed: 11/09/2022] Open
Abstract
1. The effects of pharmacological preconditioning with U50488H (U(50)), a selective kappa-opioid receptor agonist, on Ca(2+) homeostasis in rat ventricular myocytes subjected for 9 min to metabolic inhibition (MI) and anoxia (A), consequences of ischaemia, were studied and compared with those of preconditioning with brief periods of MI/A. 2. Precondition with 30 micro M of U(50) for three cycles of 1 min each cycle separated by 3 min of recovery (UP) significantly increased the percentage of non-blue cells following MI/A. The effect of UP is the same as that of preconditioning with an inhibitor of glycolysis and an oxygen scavenger for three 1-min cycles separated by three-minute recovery (MI/AP). The results indicate that like MI/AP, UP also confers cardioprotection. 3. MI/A increased intracellular Ca(2+) ([Ca(2+)](i)) and reduced the amplitude of caffeine-induced [Ca(2+)](i) transients, an indication of Ca(2+) content in the sarcoplasmic reticulum (SR). MI/A also reduced the electrically-induced [Ca(2+)](i) transient, that indicates Ca(2+)-release during excitation-contraction coupling, and Ca(2+) sparks in unstimulated myocytes, that indicates spontaneous Ca(2+)-release from SR. It also prolonged the decline of the electrically-induced [Ca(2+)](i) transient and slowed down the recovery of the electrically-induced [Ca(2+)](i) transient after administration of caffeine. In addition, MI/A prolonged the decline of caffeine induced [Ca(2+)](i) transient, an indication of Na(+)-Ca(2+) exchange activity, and UP prevented it. So UP, that confers cardioprotection, prevented the changes induced by MI/A. With the exception of Ca(2+)-spark, which was not studied, the effects of MI/AP are the same as those of UP. 4. It is concluded that pharmacological preconditioning with U(50), that confers immediate cardioprotection, prevents changes of Ca(2+) homeostasis altered by MI/A in the rat heart. This may be responsible, at least partly, for the cardioprotective action. 5. The study also provided evidence that MI/A causes mobilization of Ca(2+) from SR to cytoplasm causing Ca(2+)-overload which may be due to reduced Ca(2+)-uptake by SR. MI/A also reduces spontaneous and electrically induced Ca(2+) release from SR.
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Affiliation(s)
- J C S Ho
- Department of Physiology, Faculty of Medicine, The University of Hong Kong, Hong Kong SAR, China
| | - S Wu
- Department of Physiology, Faculty of Medicine, The University of Hong Kong, Hong Kong SAR, China
- Institute of Cardiovascular Science and Medicine, Faculty of Medicine, The University of Hong Kong, Hong Kong SAR, China
| | - K W L Kam
- Department of Physiology, Faculty of Medicine, The University of Hong Kong, Hong Kong SAR, China
| | - J S K Sham
- Division of Pulmonary and Critical Care Medicine, Johns Hopkins School of Medicine, Baltimore, Maryland, U.S.A
| | - T M Wong
- Department of Physiology, Faculty of Medicine, The University of Hong Kong, Hong Kong SAR, China
- Institute of Cardiovascular Science and Medicine, Faculty of Medicine, The University of Hong Kong, Hong Kong SAR, China
- Author for correspondence:
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Abstract
The response of dorsal root ganglion (DRG) neurons to metabolic inhibition is known to involve calcium-activated K+ channels; in most neuronal types ATP-sensitive K+ channels (K(ATP)) also contribute, but this is not yet established in the DRG. We have investigated the presence of a K(ATP) current using whole-cell recordings from rat DRG neurons, classifying the neurons functionally by their "current signature" (Petruska et al, J Neurophysiol 84:2365-2379, 2000). We clearly identified a K(ATP) current in only 1 out of 62 neurons, probably a nociceptor. The current was activated by cyanide (2 mM NaCN) and was sensitive to 100 microM tolbutamide; the relation between reversal potential and external K+ concentration indicated it was a K+ current. In a further two neurons, cyanide activated a K+ current that was only partially blocked by tolbutamide, which may also be an atypical K(ATP) current. We conclude that K(ATP) channels are expressed in normal DRG, but in very few neurons and only in nociceptors.
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Affiliation(s)
- Violeta Ristoiu
- Department of Animal Physiology and Biophysics Faculty of Biology, University of Bucharest, Splaiul Independentei 91-95, 76201 Bucharest, Romania
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Abstract
1. We used whole-cell patch clamp to investigate the currents activated by nicorandil in smooth muscle cells isolated from rat small mesenteric arteries, and studied the relaxant effect of nicorandil using myography. 2. Nicorandil (300 microM) activated currents with near-linear current-voltage relationships and reversal potentials near to the equilibrium potential for K+. 3. The nicorandil-activated current was blocked by glibenclamide (10 microM), but unaffected by iberiotoxin (100 nM) and the guanylyl cyclase inhibitor LY 83583 (1 microM). During current activation by nicorandil, openings of channels with a unitary conductance of 31 pS were detected. 4. One hundred microM nicorandil had no effect on currents through Ca2+ channels recorded in response to depolarizing voltage steps using 10 mM Ba2+ as a charge carrier. A small reduction in current amplitude was seen in 300 microM nicorandil, though this was not statistically significant. 5. In arterial rings contracted with 20 mM K+ Krebs solution containing 200 nM BAYK 8644, nicorandil produced a concentration-dependent relaxation with mean pD2 = 4.77+/-0.06. Glibenclamide (10 microM) shifted the curve to the right (pD2 = 4.32+/-0.05), as did 60 mM K+. LY 83583 caused a dose-dependent inhibition of the relaxant effect of nicorandil, while LY 83583 and glibenclamide together produced greater inhibition than either alone. 6. Metabolic inhibition with carbonyl cyanide m-chlorophenyl hydrazone (30 nM), or by reduction of extracellular glucose to 0.5 mM, increased the potency of nicorandil. 7. We conclude that nicorandil activates KATP channels in these vessels and also acts through guanylyl cyclase to cause vasorelaxation, and that the potency of nicorandil is increased during metabolic inhibition.
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Affiliation(s)
- C S Davie
- Department of Cell Physiology and Pharmacology, University of Leicester
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