351
|
Velasco M, Díaz-García CM, Larqué C, Hiriart M. Modulation of Ionic Channels and Insulin Secretion by Drugs and Hormones in Pancreatic Beta Cells. Mol Pharmacol 2016; 90:341-57. [PMID: 27436126 DOI: 10.1124/mol.116.103861] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/17/2016] [Accepted: 07/18/2016] [Indexed: 12/11/2022] Open
Abstract
Pancreatic beta cells, unique cells that secrete insulin in response to an increase in glucose levels, play a significant role in glucose homeostasis. Glucose-stimulated insulin secretion (GSIS) in pancreatic beta cells has been extensively explored. In this mechanism, glucose enters the cells and subsequently the metabolic cycle. During this process, the ATP/ADP ratio increases, leading to ATP-sensitive potassium (KATP) channel closure, which initiates depolarization that is also dependent on the activity of TRP nonselective ion channels. Depolarization leads to the opening of voltage-gated Na(+) channels (Nav) and subsequently voltage-dependent Ca(2+) channels (Cav). The increase in intracellular Ca(2+) triggers the exocytosis of insulin-containing vesicles. Thus, electrical activity of pancreatic beta cells plays a central role in GSIS. Moreover, many growth factors, incretins, neurotransmitters, and hormones can modulate GSIS, and the channels that participate in GSIS are highly regulated. In this review, we focus on the principal ionic channels (KATP, Nav, and Cav channels) involved in GSIS and how classic and new proteins, hormones, and drugs regulate it. Moreover, we also discuss advances on how metabolic disorders such as metabolic syndrome and diabetes mellitus change channel activity leading to changes in insulin secretion.
Collapse
Affiliation(s)
- Myrian Velasco
- Department of Neurodevelopment and Physiology, Neuroscience Division, Instituto de Fisiología Celular, Universidad Nacional Autónoma de México, Mexico City, Mexico
| | - Carlos Manlio Díaz-García
- Department of Neurodevelopment and Physiology, Neuroscience Division, Instituto de Fisiología Celular, Universidad Nacional Autónoma de México, Mexico City, Mexico
| | - Carlos Larqué
- Department of Neurodevelopment and Physiology, Neuroscience Division, Instituto de Fisiología Celular, Universidad Nacional Autónoma de México, Mexico City, Mexico
| | - Marcia Hiriart
- Department of Neurodevelopment and Physiology, Neuroscience Division, Instituto de Fisiología Celular, Universidad Nacional Autónoma de México, Mexico City, Mexico
| |
Collapse
|
352
|
Murphy TF, Brauer AL, Johnson A, Kirkham C. ATP-Binding Cassette (ABC) Transporters of the Human Respiratory Tract Pathogen, Moraxella catarrhalis: Role in Virulence. PLoS One 2016; 11:e0158689. [PMID: 27391026 PMCID: PMC4938438 DOI: 10.1371/journal.pone.0158689] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/27/2016] [Accepted: 06/20/2016] [Indexed: 11/24/2022] Open
Abstract
Moraxella catarrhalis is a human respiratory tract pathogen that causes otitis media (middle ear infections) in children and respiratory tract infections in adults with chronic obstructive pulmonary disease. In view of the huge global burden of disease caused by M. catarrhalis, the development of vaccines to prevent these infections and better approaches to treatment have become priorities. In previous work, we used a genome mining approach that identified three substrate binding proteins (SBPs) of ATP-binding cassette (ABC) transporters as promising candidate vaccine antigens. In the present study, we performed a comprehensive assessment of 19 SBPs of 15 ABC transporter systems in the M. catarrhalis genome by engineering knockout mutants and studying their role in assays that assess mechanisms of infection. The capacity of M. catarrhalis to survive and grow in the nutrient-limited and hostile environment of the human respiratory tract, including intracellular growth, account in part for its virulence. The results show that ABC transporters that mediate uptake of peptides, amino acids, cations and anions play important roles in pathogenesis by enabling M. catarrhalis to 1) grow in nutrient-limited conditions, 2) invade and survive in human respiratory epithelial cells and 3) persist in the lungs in a murine pulmonary clearance model. The knockout mutants of SBPs and ABC transporters showed different patterns of activity in the assay systems, supporting the conclusion that different SBPs and ABC transporters function at different stages in the pathogenesis of infection. These results indicate that ABC transporters are nutritional virulence factors, functioning to enable the survival of M catarrhalis in the diverse microenvironments of the respiratory tract. Based on the role of ABC transporters as virulence factors of M. catarrhalis, these molecules represent potential drug targets to eradicate the organism from the human respiratory tract.
Collapse
Affiliation(s)
- Timothy F Murphy
- Clinical and Translational Research Center, University at Buffalo, the State University of New York, Buffalo, NY, United States of America
- Division of Infectious Diseases, Department of Medicine, University at Buffalo, the State University of New York, Buffalo, NY, United States of America
- Department of Microbiology, University at Buffalo, the State University of New York, Buffalo, NY, United States of America
- * E-mail:
| | - Aimee L. Brauer
- Clinical and Translational Research Center, University at Buffalo, the State University of New York, Buffalo, NY, United States of America
- Division of Infectious Diseases, Department of Medicine, University at Buffalo, the State University of New York, Buffalo, NY, United States of America
| | - Antoinette Johnson
- Clinical and Translational Research Center, University at Buffalo, the State University of New York, Buffalo, NY, United States of America
- Division of Infectious Diseases, Department of Medicine, University at Buffalo, the State University of New York, Buffalo, NY, United States of America
| | - Charmaine Kirkham
- Clinical and Translational Research Center, University at Buffalo, the State University of New York, Buffalo, NY, United States of America
- Division of Infectious Diseases, Department of Medicine, University at Buffalo, the State University of New York, Buffalo, NY, United States of America
| |
Collapse
|
353
|
Overcoming ABC transporter-mediated multidrug resistance: Molecular mechanisms and novel therapeutic drug strategies. Drug Resist Updat 2016; 27:14-29. [DOI: 10.1016/j.drup.2016.05.001] [Citation(s) in RCA: 464] [Impact Index Per Article: 58.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/17/2015] [Revised: 04/24/2016] [Accepted: 05/06/2016] [Indexed: 12/15/2022]
|
354
|
Schindler BD, Kaatz GW. Multidrug efflux pumps of Gram-positive bacteria. Drug Resist Updat 2016; 27:1-13. [DOI: 10.1016/j.drup.2016.04.003] [Citation(s) in RCA: 126] [Impact Index Per Article: 15.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/04/2016] [Revised: 03/28/2016] [Accepted: 04/22/2016] [Indexed: 11/16/2022]
|
355
|
Frixel S, Lotz-Havla AS, Kern S, Kaltenborn E, Wittmann T, Gersting SW, Muntau AC, Zarbock R, Griese M. Homooligomerization of ABCA3 and its functional significance. Int J Mol Med 2016; 38:558-66. [PMID: 27352740 DOI: 10.3892/ijmm.2016.2650] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/09/2016] [Accepted: 05/11/2016] [Indexed: 11/06/2022] Open
Abstract
ABCA3 is a surfactant lipid transporter in the limiting membrane of lamellar bodies in alveolar type II cells. Mutations in the ATP-binding cassette, sub-family A (ABC1), member 3 (ABCA3) gene cause respiratory distress syndrome in newborns, and chronic interstitial lung disease in children and adults. ABCA3 belongs to the class of full ABC transporters, which are supposed to be functional in their monomeric forms. Although other family members e.g., ABCA1 and ABCC7 have been shown to function as oligomers, the oligomerization state of ABCA3 is unknown. In the present study, the oligomerization of ABCA3 was investigated in cell lysates and crude membrane preparations from transiently and stably transfected 293 cells using blue native PAGE (BN-PAGE), gel filtration and co-immunoprecipitation. Additionally, homooligomerization was examined in vivo in cells using bioluminescence resonance energy transfer (BRET). Using BN-PAGE and gel filtration, we demonstrate that non-denatured ABCA3 exists in different oligomeric forms, with monomers (45%) and tetramers (30%) being the most abundant forms. Furthermore, we also show the existence of 20% dimers and 5% trimers. BRET analyses verified intermolecular interactions in vivo. Our results also demonstrated that the arrest of ABCA3 in the endoplasmic reticulum (ER), either through drug treatment or induced by mutations in ABCA3, inhibited the propensity of the protein to form dimers. Based on our results, we suggest that transporter oligomerization is crucial for ABCA3 function and that a disruption of oligomerization due to mutations represents a novel pathomechanism in ABCA3-associated lung disease.
Collapse
Affiliation(s)
- Sabrina Frixel
- German Centre for Lung Research, Dr von Hauner Children's Hospital, Ludwig-Maximilians University, D-80337 Munich, Germany
| | - Amelie S Lotz-Havla
- Department of Molecular Pediatrics, Dr von Hauner Children's Hospital, Ludwig-Maximilians University, D-80337 Munich, Germany
| | - Sunčana Kern
- German Centre for Lung Research, Dr von Hauner Children's Hospital, Ludwig-Maximilians University, D-80337 Munich, Germany
| | - Eva Kaltenborn
- German Centre for Lung Research, Dr von Hauner Children's Hospital, Ludwig-Maximilians University, D-80337 Munich, Germany
| | - Thomas Wittmann
- German Centre for Lung Research, Dr von Hauner Children's Hospital, Ludwig-Maximilians University, D-80337 Munich, Germany
| | - Søren W Gersting
- Department of Molecular Pediatrics, Dr von Hauner Children's Hospital, Ludwig-Maximilians University, D-80337 Munich, Germany
| | - Ania C Muntau
- University Children's Hospital, University Medical Center Hamburg-Eppendorf, D-20246 Hamburg, Germany
| | - Ralf Zarbock
- German Centre for Lung Research, Dr von Hauner Children's Hospital, Ludwig-Maximilians University, D-80337 Munich, Germany
| | - Matthias Griese
- German Centre for Lung Research, Dr von Hauner Children's Hospital, Ludwig-Maximilians University, D-80337 Munich, Germany
| |
Collapse
|
356
|
Frank GA, Shukla S, Rao P, Borgnia MJ, Bartesaghi A, Merk A, Mobin A, Esser L, Earl LA, Gottesman MM, Xia D, Ambudkar SV, Subramaniam S. Cryo-EM Analysis of the Conformational Landscape of Human P-glycoprotein (ABCB1) During its Catalytic Cycle. Mol Pharmacol 2016; 90:35-41. [PMID: 27190212 PMCID: PMC4931865 DOI: 10.1124/mol.116.104190] [Citation(s) in RCA: 65] [Impact Index Per Article: 8.1] [Reference Citation Analysis] [Abstract] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/04/2016] [Accepted: 05/05/2016] [Indexed: 11/22/2022] Open
Abstract
The multidrug transporter P-glycoprotein (P-gp, ABCB1) is an ATP-dependent pump that mediates the efflux of structurally diverse drugs and xenobiotics across cell membranes, affecting drug pharmacokinetics and contributing to the development of multidrug resistance. Structural information about the conformational changes in human P-gp during the ATP hydrolysis cycle has not been directly demonstrated, although mechanistic information has been inferred from biochemical and biophysical studies conducted with P-gp and its orthologs, or from structures of other ATP-binding cassette transporters. Using single-particle cryo-electron microscopy, we report the surprising discovery that, in the absence of the transport substrate and nucleotides, human P-gp can exist in both open [nucleotide binding domains (NBDs) apart; inward-facing] and closed (NBDs close; outward-facing) conformations. We also probe conformational states of human P-gp during the catalytic cycle, and demonstrate that, following ATP hydrolysis, P-gp transitions through a complete closed conformation to a complete open conformation in the presence of ADP.
Collapse
Affiliation(s)
- Gabriel A Frank
- Laboratory of Cell Biology, Center for Cancer Research, National Cancer Institute, National Institutes of Health, Bethesda, Maryland
| | - Suneet Shukla
- Laboratory of Cell Biology, Center for Cancer Research, National Cancer Institute, National Institutes of Health, Bethesda, Maryland
| | - Prashant Rao
- Laboratory of Cell Biology, Center for Cancer Research, National Cancer Institute, National Institutes of Health, Bethesda, Maryland
| | - Mario J Borgnia
- Laboratory of Cell Biology, Center for Cancer Research, National Cancer Institute, National Institutes of Health, Bethesda, Maryland
| | - Alberto Bartesaghi
- Laboratory of Cell Biology, Center for Cancer Research, National Cancer Institute, National Institutes of Health, Bethesda, Maryland
| | - Alan Merk
- Laboratory of Cell Biology, Center for Cancer Research, National Cancer Institute, National Institutes of Health, Bethesda, Maryland
| | - Aerfa Mobin
- Laboratory of Cell Biology, Center for Cancer Research, National Cancer Institute, National Institutes of Health, Bethesda, Maryland
| | - Lothar Esser
- Laboratory of Cell Biology, Center for Cancer Research, National Cancer Institute, National Institutes of Health, Bethesda, Maryland
| | - Lesley A Earl
- Laboratory of Cell Biology, Center for Cancer Research, National Cancer Institute, National Institutes of Health, Bethesda, Maryland
| | - Michael M Gottesman
- Laboratory of Cell Biology, Center for Cancer Research, National Cancer Institute, National Institutes of Health, Bethesda, Maryland
| | - Di Xia
- Laboratory of Cell Biology, Center for Cancer Research, National Cancer Institute, National Institutes of Health, Bethesda, Maryland
| | - Suresh V Ambudkar
- Laboratory of Cell Biology, Center for Cancer Research, National Cancer Institute, National Institutes of Health, Bethesda, Maryland
| | - Sriram Subramaniam
- Laboratory of Cell Biology, Center for Cancer Research, National Cancer Institute, National Institutes of Health, Bethesda, Maryland
| |
Collapse
|
357
|
A PhoPQ-Regulated ABC Transporter System Exports Tetracycline in Pseudomonas aeruginosa. Antimicrob Agents Chemother 2016; 60:3016-24. [PMID: 26953208 DOI: 10.1128/aac.02986-15] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/16/2015] [Accepted: 02/29/2016] [Indexed: 12/21/2022] Open
Abstract
Pseudomonas aeruginosa is an important human pathogen whose infections are difficult to treat due to its high intrinsic resistance to many antibiotics. Here, we show that the disruption of PA4456, encoding the ATP binding component of a putative ATP-binding cassette (ABC) transporter, increased the bacterium's susceptible to tetracycline and other antibiotics or toxic chemicals. Fluorescence spectroscopy and antibiotic accumulation tests showed that the interruption of the ABC transporter caused increased intracellular accumulation of tetracycline, demonstrating a role of the ABC transporter in tetracycline expulsion. Site-directed mutagenesis proved that the conserved residues of E170 in the Walker B motif and H203 in the H-loop, which are important for ATP hydrolysis, were essential for the function of PA4456. Through a genome-wide search, the PhoPQ two-component system was identified as a regulator of the computationally predicted PA4456-4452 operon that encodes the ABC transporter system. A >5-fold increase of the expression of this operon was observed in the phoQ mutant. The results obtained also show that the expression of the phzA1B1C1D1E1 operon and the production of pyocyanin were significantly higher in the ABC transporter mutant, signifying a connection between the ABC transporter and pyocyanin production. These results indicated that the PhoPQ-regulated ABC transporter is associated with intrinsic resistance to antibiotics and other adverse compounds in P. aeruginosa, probably by extruding them out of the cell.
Collapse
|
358
|
Mutations in Novel Lipopolysaccharide Biogenesis Genes Confer Resistance to Amoebal Grazing in Synechococcus elongatus. Appl Environ Microbiol 2016; 82:2738-50. [PMID: 26921432 DOI: 10.1128/aem.00135-16] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/25/2016] [Accepted: 02/23/2016] [Indexed: 12/22/2022] Open
Abstract
In natural and artificial aquatic environments, population structures and dynamics of photosynthetic microbes are heavily influenced by the grazing activity of protistan predators. Understanding the molecular factors that affect predation is critical for controlling toxic cyanobacterial blooms and maintaining cyanobacterial biomass production ponds for generating biofuels and other bioproducts. We previously demonstrated that impairment of the synthesis or transport of the O-antigen component of lipopolysaccharide (LPS) enables resistance to amoebal grazing in the model predator-prey system consisting of the heterolobosean amoeba HGG1 and the cyanobacterium Synechococcus elongates PCC 7942 (R. S. Simkovsky et al., Proc Natl Acad Sci U S A 109:16678-16683, 2012,http://dx.doi.org/10.1073/pnas.1214904109). In this study, we used this model system to identify additional gene products involved in the synthesis of O antigen, the ligation of O antigen to the lipid A-core conjugated molecule (including a novel ligase gene), the generation of GDP-fucose, and the incorporation of sugars into the lipid A core oligosaccharide ofS. elongatus Knockout of any of these genes enables resistance to HGG1, and of these, only disruption of the genes involved in synthesis or incorporation of GDP-fucose into the lipid A-core molecule impairs growth. Because these LPS synthesis genes are well conserved across the diverse range of cyanobacteria, they enable a broader understanding of the structure and synthesis of cyanobacterial LPS and represent mutational targets for generating resistance to amoebal grazers in novel biomass production strains.
Collapse
|
359
|
Correction: Learning from each other: ABC transporter regulation by protein phosphorylation in plant and mammalian systems. Biochem Soc Trans 2016; 44:663-73. [DOI: 10.1042/bst20150128_2] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/27/2015] [Indexed: 12/31/2022]
Abstract
The ABC (ATP-binding cassette) transporter family in higher plants is highly expanded compared with those of mammalians. Moreover, some members of the plant ABCB subfamily display very high substrate specificity compared with their mammalian counterparts that are often associated with multidrug resistance (MDR) phenomena. In this review we highlight prominent functions of plant and mammalian ABC transporters and summarize our knowledge on their post-transcriptional regulation with a focus on protein phosphorylation. A deeper comparison of regulatory events of human cystic fibrosis transmembrane conductance regulator (CFTR) and ABCB1 from the model plant Arabidopsis reveals a surprisingly high degree of similarity. Both physically interact with orthologues of the FK506-binding proteins (FKBPs) that chaperon both transporters to the plasma membrane in an action that seems to involve Hsp90. Further both transporters are phosphorylated at regulatory domains that connect both nucleotide-binding folds. Taken together it appears that ABC transporters exhibit an evolutionary conserved but complex regulation by protein phosphorylation, which apparently is, at least in some cases, tightly connected with protein–protein interactions (PPI).
Collapse
|
360
|
The Role of Xenobiotic-Metabolizing Enzymes in Anthelmintic Deactivation and Resistance in Helminths. Trends Parasitol 2016; 32:481-491. [PMID: 26968642 DOI: 10.1016/j.pt.2016.02.004] [Citation(s) in RCA: 54] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/07/2016] [Revised: 02/03/2016] [Accepted: 02/10/2016] [Indexed: 12/24/2022]
Abstract
Xenobiotic-metabolizing enzymes (XMEs) modulate the biological activity and behavior of many drugs, including anthelmintics. The effects of anthelmintics can often be abolished by XMEs when the drugs are metabolized to an inefficient compound. XMEs therefore play a significant role in anthelmintic efficacy. Moreover, differences in XMEs between helminths are reflected by differences in anthelmintic metabolism between target species. Taking advantage of the newly sequenced genomes of many helminth species, progress in this field has been remarkable. The present review collects up to date information regarding the most important XMEs (phase I and phase II biotransformation enzymes; efflux transporters) in helminths. The participation of these XMEs in anthelmintic metabolism and their possible roles in drug resistance are evaluated.
Collapse
|
361
|
Hwang JU, Song WY, Hong D, Ko D, Yamaoka Y, Jang S, Yim S, Lee E, Khare D, Kim K, Palmgren M, Yoon HS, Martinoia E, Lee Y. Plant ABC Transporters Enable Many Unique Aspects of a Terrestrial Plant's Lifestyle. MOLECULAR PLANT 2016; 9:338-355. [PMID: 26902186 DOI: 10.1016/j.molp.2016.02.003] [Citation(s) in RCA: 210] [Impact Index Per Article: 26.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/17/2015] [Revised: 02/11/2016] [Accepted: 02/14/2016] [Indexed: 05/17/2023]
Abstract
Terrestrial plants have two to four times more ATP-binding cassette (ABC) transporter genes than other organisms, including their ancestral microalgae. Recent studies found that plants harboring mutations in these transporters exhibit dramatic phenotypes, many of which are related to developmental processes and functions necessary for life on dry land. These results suggest that ABC transporters multiplied during evolution and assumed novel functions that allowed plants to adapt to terrestrial environmental conditions. Examining the literature on plant ABC transporters from this viewpoint led us to propose that diverse ABC transporters enabled many unique and essential aspects of a terrestrial plant's lifestyle, by transporting various compounds across specific membranes of the plant.
Collapse
Affiliation(s)
- Jae-Ung Hwang
- Department of Life Science, Pohang University of Science and Technology (POSTECH), Pohang, 37673, Korea
| | - Won-Yong Song
- Division of Integrative Bioscience and Biotechnology, POSTECH, Pohang, 37673, Korea
| | - Daewoong Hong
- Department of Life Science, Pohang University of Science and Technology (POSTECH), Pohang, 37673, Korea
| | - Donghwi Ko
- Department of Life Science, Pohang University of Science and Technology (POSTECH), Pohang, 37673, Korea
| | - Yasuyo Yamaoka
- Department of Life Science, Pohang University of Science and Technology (POSTECH), Pohang, 37673, Korea
| | - Sunghoon Jang
- Department of Life Science, Pohang University of Science and Technology (POSTECH), Pohang, 37673, Korea
| | - Sojeong Yim
- Department of Life Science, Pohang University of Science and Technology (POSTECH), Pohang, 37673, Korea
| | - Eunjung Lee
- Department of Life Science, Pohang University of Science and Technology (POSTECH), Pohang, 37673, Korea
| | - Deepa Khare
- Department of Life Science, Pohang University of Science and Technology (POSTECH), Pohang, 37673, Korea
| | - Kyungyoon Kim
- Department of Life Science, Pohang University of Science and Technology (POSTECH), Pohang, 37673, Korea
| | - Michael Palmgren
- Center for Membrane Pumps in Cells and Disease - PUMPKIN, Danish National Research Foundation, Department of Plant and Environmental Science, University of Copenhagen, 1871 Frederiksberg, Denmark
| | - Hwan Su Yoon
- Department of Biological Sciences, Sungkyunkwan University, Suwon, 16419, Korea
| | - Enrico Martinoia
- Department of Plant and Microbial Biology, University Zurich, Zurich, 8008 Zurich, Switzerland
| | - Youngsook Lee
- Department of Life Science, Pohang University of Science and Technology (POSTECH), Pohang, 37673, Korea; Division of Integrative Bioscience and Biotechnology, POSTECH, Pohang, 37673, Korea.
| |
Collapse
|
362
|
Sui H, Zhou L, Zhang Y, Huang J, Liu X, Ji Q, Fu X, Wen H, Chen Z, Deng W, Zhu H, Li Q. Evodiamine Suppresses ABCG2 Mediated Drug Resistance by Inhibiting p50/p65 NF‐κB Pathway in Colorectal Cancer. J Cell Biochem 2016; 117:1471-81. [DOI: 10.1002/jcb.25451] [Citation(s) in RCA: 34] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/25/2015] [Accepted: 11/19/2015] [Indexed: 01/30/2023]
Affiliation(s)
- Hua Sui
- Department of Medical OncologyShuguang HospitalShanghai University of Traditional Chinese MedicineShanghai201203China
| | - Li‐Hong Zhou
- Department of Medical OncologyShuguang HospitalShanghai University of Traditional Chinese MedicineShanghai201203China
| | - Ya‐Li Zhang
- Department of NursingShuguang HospitalShanghai University of Traditional Chinese MedicineShanghai201203China
| | - Jian‐Ping Huang
- Department of General SurgeryShuguang HospitalShanghai University of Traditional Chinese MedicineShanghai201203China
| | - Xuan Liu
- Department of Medical OncologyShuguang HospitalShanghai University of Traditional Chinese MedicineShanghai201203China
| | - Qing Ji
- Department of Medical OncologyShuguang HospitalShanghai University of Traditional Chinese MedicineShanghai201203China
| | - Xiao‐Ling Fu
- Department of Medical OncologyShuguang HospitalShanghai University of Traditional Chinese MedicineShanghai201203China
| | - Hao‐Tian Wen
- Shanghai University of Traditional Chinese MedicineShanghai201203China
| | - Zhe‐Sheng Chen
- Department of Pharmaceutical SciencesCollege of Pharmacy and Health SciencesSt. John's UniversityQueensNew York11439
| | - Wan‐Li Deng
- Department of Medical OncologyShuguang HospitalShanghai University of Traditional Chinese MedicineShanghai201203China
| | - Hui‐Rong Zhu
- Department of Medical OncologyShuguang HospitalShanghai University of Traditional Chinese MedicineShanghai201203China
| | - Qi Li
- Department of Medical OncologyShuguang HospitalShanghai University of Traditional Chinese MedicineShanghai201203China
| |
Collapse
|
363
|
NIE JIAO, ZHAO CHANGLIN, DENG LI, CHEN JIA, YU BIN, WU XIANLIN, PANG PENG, CHEN XIAOYIN. Efficacy of traditional Chinese medicine in treating cancer. Biomed Rep 2016; 4:3-14. [PMID: 26870326 PMCID: PMC4726876 DOI: 10.3892/br.2015.537] [Citation(s) in RCA: 70] [Impact Index Per Article: 8.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/18/2015] [Accepted: 09/25/2015] [Indexed: 12/13/2022] Open
Abstract
The morbidity associated with cancer has rapidly increased in recent years, and in the previous 5 years has had a tendency to be the leading cause of fatality compared with cardiovascular disease. Therefore, effective measures are required with an aim to reduce the incidence. Based on the results of clinical investigation, a multidisciplinary treatment strategy for cancer, which includes radiotherapy, chemotherapy, surgery, targeted therapy and immunotherapy, are prominently used in clinical practice. However, the therapies are insufficient due to multidrug resistance, adverse effects and the presence of the root of the cancer. Therefore, there is a necessity to develop more effective or adjunctive therapies for cancer prevention and treatment. Cancer is now widely recognized as a systemic humoral disease. Similarly, the function of herbal drugs is to modulate the whole body system in a more holistic way. Recently, herbal drugs have been applied to one of the efficient approaches for cancer therapy. Furthermore, there is evidence that various herbal medicines have been proven to be useful and effective in sensitizing the conventional agents against the various factors at the cellular and molecular levels that are associated with the occurrence of cancer and in prolonging survival time, alleviating side effects of chemotherapy and radiotherapy and improving the quality of life in cancer patients.
Collapse
Affiliation(s)
- JIAO NIE
- Department of Traditional Chinese Medicine, Medical College of Jinan University, Guangzhou, Guangdong 510632, P.R. China
| | - CHANGLIN ZHAO
- Department of Traditional Chinese Medicine, Medical College of Jinan University, Guangzhou, Guangdong 510632, P.R. China
- Department of Oncology, Clifford Hospital of Guangzhou University of Traditional Chinese Medicine, Guangzhou, Guangdong 510632, P.R. China
| | - LI DENG
- Department of Traditional Chinese Medicine, Medical College of Jinan University, Guangzhou, Guangdong 510632, P.R. China
| | - JIA CHEN
- Department of Traditional Chinese Medicine, Medical College of Jinan University, Guangzhou, Guangdong 510632, P.R. China
| | - BIN YU
- Department of Traditional Chinese Medicine, Medical College of Jinan University, Guangzhou, Guangdong 510632, P.R. China
- Clinical Institute, Jining Medical University, Jining, Shandong 272013, P.R. China
| | - XIANLIN WU
- Department of Traditional Chinese Medicine, Medical College of Jinan University, Guangzhou, Guangdong 510632, P.R. China
- Department of Pancreatic Disease Center, The First Affiliated Hospital of Jinan University, Guangzhou, Guangdong 510632, P.R. China
| | - PENG PANG
- Department of Traditional Chinese Medicine, Medical College of Jinan University, Guangzhou, Guangdong 510632, P.R. China
| | - XIAOYIN CHEN
- Department of Traditional Chinese Medicine, Medical College of Jinan University, Guangzhou, Guangdong 510632, P.R. China
| |
Collapse
|
364
|
Hussain SA, Sulaiman AA, Alhaddad H, Alhadidi Q. Natural polyphenols: Influence on membrane transporters. JOURNAL OF COMPLEMENTARY MEDICINE RESEARCH 2016; 5:97-104. [PMID: 27069731 PMCID: PMC4805155 DOI: 10.5455/jice.20160118062127] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/09/2015] [Accepted: 01/18/2016] [Indexed: 02/02/2023]
Abstract
Accumulated evidence has focused on the use of natural polyphenolic compounds as nutraceuticals since they showed a wide range of bioactivities and exhibited protection against variety of age-related disorders. Polyphenols have variable potencies to interact, and hence alter the activities of various transporter proteins, many of them classified as anion transporting polypeptide-binding cassette transporters like multidrug resistance protein and p-glycoprotein. Some of the efflux transporters are, generally, linked with anticancer and antiviral drug resistance; in this context, polyphenols may be beneficial in modulating drug resistance by increasing the efficacy of anticancer and antiviral drugs. In addition, these effects were implicated to explain the influence of dietary polyphenols on drug efficacy as result of food-drug interactions. However, limited data are available about the influence of these components on uptake transporters. Therefore, the objective of this article is to review the potential efficacies of polyphenols in modulating the functional integrity of uptake transporter proteins, including those terminated the effect of neurotransmitters, and their possible influence in neuropharmacology.
Collapse
Affiliation(s)
- Saad Abdulrahman Hussain
- Department of Pharmacology and Toxicology, College of Pharmacy, University of Baghdad, Baghdad, Iraq
| | - Amal Ajaweed Sulaiman
- Department of Pharmacology and Toxicology, College of Pharmacy, University of Baghdad, Baghdad, Iraq
| | - Hasan Alhaddad
- Department of Pharmacology and Toxicology, College of Pharmacy, University of Baghdad, Baghdad, Iraq
| | - Qasim Alhadidi
- Department of Medicinal and Biological Chemistry, College of Pharmacy and Pharmaceutical Sciences, University of Toledo, 3000 Arlington Avenue, Toledo, OH, 43614, USA
| |
Collapse
|
365
|
Exporters for Production of Amino Acids and Other Small Molecules. ADVANCES IN BIOCHEMICAL ENGINEERING/BIOTECHNOLOGY 2016; 159:199-225. [PMID: 27832297 DOI: 10.1007/10_2016_32] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
Microbes are talented catalysts to synthesize valuable small molecules in their cytosol. However, to make full use of their skills - and that of metabolic engineers - the export of intracellularly synthesized molecules to the culture medium has to be considered. This step is as essential as is each step for the synthesis of the favorite molecule of the metabolic engineer, but is frequently not taken into account. To export small molecules via the microbial cell envelope, a range of different types of carrier proteins is recognized to be involved, which are primary active carriers, secondary active carriers, or proteins increasing diffusion. Relevant export may require just one carrier as is the case with L-lysine export by Corynebacterium glutamicum or involve up to four carriers as known for L-cysteine excretion by Escherichia coli. Meanwhile carriers for a number of small molecules of biotechnological interest are recognized, like for production of peptides, nucleosides, diamines, organic acids, or biofuels. In addition to carriers involved in amino acid excretion, such carriers and their impact on product formation are described, as well as the relatedness of export carriers which may serve as a hint to identify further carriers required to improve product formation by engineering export.
Collapse
|
366
|
De Zorzi R, Mi W, Liao M, Walz T. Single-particle electron microscopy in the study of membrane protein structure. Microscopy (Oxf) 2015; 65:81-96. [PMID: 26470917 DOI: 10.1093/jmicro/dfv058] [Citation(s) in RCA: 28] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/31/2015] [Accepted: 09/20/2015] [Indexed: 01/13/2023] Open
Abstract
Single-particle electron microscopy (EM) provides the great advantage that protein structure can be studied without the need to grow crystals. However, due to technical limitations, this approach played only a minor role in the study of membrane protein structure. This situation has recently changed dramatically with the introduction of direct electron detection device cameras, which allow images of unprecedented quality to be recorded, also making software algorithms, such as three-dimensional classification and structure refinement, much more powerful. The enhanced potential of single-particle EM was impressively demonstrated by delivering the first long-sought atomic model of a member of the biomedically important transient receptor potential channel family. Structures of several more membrane proteins followed in short order. This review recounts the history of single-particle EM in the study of membrane proteins, describes the technical advances that now allow this approach to generate atomic models of membrane proteins and provides a brief overview of some of the membrane protein structures that have been studied by single-particle EM to date.
Collapse
Affiliation(s)
- Rita De Zorzi
- Department of Cell Biology, Harvard Medical School, 200 Longwood Avenue, Boston, MA 02115, USA Howard Hughes Medical Institute, Harvard Medical School, 200 Longwood Avenue, Boston, MA 02115, USA
| | - Wei Mi
- Department of Cell Biology, Harvard Medical School, 200 Longwood Avenue, Boston, MA 02115, USA
| | - Maofu Liao
- Department of Cell Biology, Harvard Medical School, 200 Longwood Avenue, Boston, MA 02115, USA
| | - Thomas Walz
- Department of Cell Biology, Harvard Medical School, 200 Longwood Avenue, Boston, MA 02115, USA Howard Hughes Medical Institute, Harvard Medical School, 200 Longwood Avenue, Boston, MA 02115, USA
| |
Collapse
|
367
|
Watching conformational dynamics of ABC transporters with single-molecule tools. Biochem Soc Trans 2015; 43:1041-7. [DOI: 10.1042/bst20150140] [Citation(s) in RCA: 28] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
Abstract
ATP-binding cassette (ABC) transporters play crucial roles in cellular processes, such as nutrient uptake, drug resistance, cell-volume regulation and others. Despite their importance, all proposed molecular models for transport are based on indirect evidence, i.e. functional interpretation of static crystal structures and ensemble measurements of function and structure. Thus, classical biophysical and biochemical techniques do not readily visualize dynamic structural changes. We recently started to use single-molecule fluorescence techniques to study conformational states and changes of ABC transporters in vitro, in order to observe directly how the different steps during transport are coordinated. This review summarizes our scientific strategy and some of the key experimental advances that allowed the substrate-binding mechanism of prokaryotic ABC importers and the transport cycle to be explored. The conformational states and transitions of ABC-associated substrate-binding domains (SBDs) were visualized with single-molecule FRET, permitting a direct correlation of structural and kinetic information of SBDs. We also delineated the different steps of the transport cycle. Since information in such assays are restricted by proper labelling of proteins with fluorescent dyes, we present a simple approach to increase the amount of protein with FRET information based on non-specific interactions between a dye and the size-exclusion chromatography (SEC) column material used for final purification.
Collapse
|
368
|
N-Monosubstituted Methoxy-oligo(ethylene glycol) Carbamate Ester Prodrugs of Resveratrol. Molecules 2015; 20:16085-102. [PMID: 26404221 PMCID: PMC6332312 DOI: 10.3390/molecules200916085] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/28/2015] [Revised: 08/27/2015] [Accepted: 08/28/2015] [Indexed: 12/18/2022] Open
Abstract
Resveratrol is a natural polyphenol with many interesting biological activities. Its pharmacological exploitation in vivo is, however, hindered by its rapid elimination via phase II conjugative metabolism at the intestinal and, most importantly, hepatic levels. One approach to bypass this problem relies on prodrugs. We report here the synthesis, characterization, hydrolysis, and in vivo pharmacokinetic behavior of resveratrol prodrugs in which the OH groups are engaged in an N-monosubstituted carbamate ester linkage. As promoiety, methoxy-oligo(ethylene glycol) groups (m-OEG) (CH3–[OCH2CH2]n–) of defined chain length (n = 3, 4, 6) were used. These are expected to modulate the chemico-physical properties of the resulting derivatives, much like longer poly(ethylene glycol) (PEG) chains, while retaining a relatively low MW and, thus, a favorable drug loading capacity. Intragastric administration to rats resulted in the appearance in the bloodstream of the prodrug and of the products of its partial hydrolysis, confirming protection from first-pass metabolism during absorption.
Collapse
|