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Sasaki A, Nishimura T, Takano T, Naito S, Yoo SK. white regulates proliferative homeostasis of intestinal stem cells during ageing in Drosophila. Nat Metab 2021; 3:546-557. [PMID: 33820991 DOI: 10.1038/s42255-021-00375-x] [Citation(s) in RCA: 21] [Impact Index Per Article: 7.0] [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] [Received: 03/04/2020] [Accepted: 02/25/2021] [Indexed: 12/19/2022]
Abstract
Tissue integrity is contingent on maintaining stem cells. Intestinal stem cells (ISCs) over-proliferate during ageing, leading to tissue dysplasia in Drosophila melanogaster. Here we describe a role for white, encoding the evolutionarily conserved ATP-binding cassette transporter subfamily G, with a particularly well-characterized role in eye colour pigmentation, in ageing-induced ISC proliferation in the midgut. ISCs increase expression of white during ageing. ISC-specific inhibition of white suppresses ageing-induced ISC dysregulation and prolongs lifespan. Of the proteins that form heterodimers with White, Brown mediates ISC dysregulation during ageing. Metabolomics analyses reveal previously unappreciated, profound metabolic impacts of white inhibition on organismal metabolism. Among the metabolites affected by White, tetrahydrofolate is transported by White, is accumulated in ISCs during ageing and is indispensable for ageing-induced ISC over-proliferation. Since Thomas Morgan's isolation of a white mutant as the first Drosophila mutant, white mutants have been used extensively as genetic systems and often as controls. Our findings provide insights into metabolic regulation of stem cells mediated by the classic gene white.
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Affiliation(s)
- Ayaka Sasaki
- Graduate School of Science and Technology, Kwansei Gakuin University, Sanda, Japan
- Physiological Genetics Laboratory, RIKEN CPR, Kobe, Japan
| | | | - Tomomi Takano
- Physiological Genetics Laboratory, RIKEN CPR, Kobe, Japan
- Laboratory for Homeodynamics, RIKEN BDR, Kobe, Japan
| | - Saki Naito
- Laboratory for Homeodynamics, RIKEN BDR, Kobe, Japan
- Graduate School of Frontier Biosciences, Osaka University, Suita, Japan
| | - Sa Kan Yoo
- Graduate School of Science and Technology, Kwansei Gakuin University, Sanda, Japan.
- Physiological Genetics Laboratory, RIKEN CPR, Kobe, Japan.
- Laboratory for Homeodynamics, RIKEN BDR, Kobe, Japan.
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Víglaš J, Olejníková P. An update on ABC transporters of filamentous fungi - from physiological substrates to xenobiotics. Microbiol Res 2021; 246:126684. [PMID: 33529790 DOI: 10.1016/j.micres.2020.126684] [Citation(s) in RCA: 23] [Impact Index Per Article: 7.7] [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: 10/29/2020] [Revised: 12/13/2020] [Accepted: 12/18/2020] [Indexed: 02/02/2023]
Abstract
The superfamily of ATP-binding cassette (ABC) transporters is a large family of proteins with a wide substrate repertoire and range of functions. The main role of these proteins is in the transportation of different molecules across biological membranes. Due to the broad range of substrates, ABC transporters can transport not only natural metabolites but also various xenobiotics, including antifungal compounds, which makes some ABC transporters key players in antifungal resistance. Alternatively, ABC proteins without transport function seem to be essential for fungal cell viability. In this work, we review the individual subfamilies of ABC transporters in filamentous fungi regarding physiological substrates, clinical and agricultural significance. Subfamilies are defined using well-studied transporters in yeast, which may help to clarify their role in filamentous fungi.
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Affiliation(s)
- Ján Víglaš
- Institute of Biochemistry and Microbiology, Faculty of Chemical and Food Technology, Slovak University of Technology in Bratislava, Radlinského 9, 81237, Bratislava, Slovakia.
| | - Petra Olejníková
- Institute of Biochemistry and Microbiology, Faculty of Chemical and Food Technology, Slovak University of Technology in Bratislava, Radlinského 9, 81237, Bratislava, Slovakia.
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3
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Wang W, Liang Z, Ma P, Zhao Q, Dai M, Zhu J, Han X, Xu H, Chang Q, Zhen Y. Application of CRISPR/Cas9 System to Reverse ABC-Mediated Multidrug Resistance. Bioconjug Chem 2021; 32:73-81. [PMID: 33393280 DOI: 10.1021/acs.bioconjchem.0c00627] [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] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
Multidrug resistance (MDR) is the main obstacle in cancer chemotherapy. ATP-binding cassette (ABC) transporters can transport a wide range of antitumor drugs out of cells, which is the most common reason in the development of resistance to drugs. Currently, various therapeutic strategies are used to reverse MDR, among which CRISPR/Cas9 gene editing technique is expected to be an effective way. Here, we reviewed the research progress of reversing ABC-mediated drug resistance by CRISPR/Cas9 system.
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Affiliation(s)
- Wei Wang
- College of Pharmacy, Dalian Medical University, Dalian, 116044, China
| | - Ze Liang
- College of Pharmacy, Dalian Medical University, Dalian, 116044, China
| | - Pengfei Ma
- College of Pharmacy, Dalian Medical University, Dalian, 116044, China
| | - Qi Zhao
- The First Affiliated Hospital of Dalian Medical University, Dalian, 116023, China
| | - Mengyuan Dai
- The Second Affiliated Hospital of Dalian Medical University, Dalian, 116011, China
| | - Jie Zhu
- The Second Affiliated Hospital of Dalian Medical University, Dalian, 116011, China
| | - Xu Han
- College of Pharmacy, Dalian Medical University, Dalian, 116044, China
| | - Hong Xu
- College of Basic Medical Sciences, Dalian Medical University, Dalian, 116044, China
| | - Qingyan Chang
- Pharmacy Department, Dalian Sixth People Hospital of Dalian Medical University, Dalian 116031, China
| | - Yuhong Zhen
- College of Pharmacy, Dalian Medical University, Dalian, 116044, China
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Sadhukhan A, Agrahari RK, Wu L, Watanabe T, Nakano Y, Panda SK, Koyama H, Kobayashi Y. Expression genome-wide association study identifies that phosphatidylinositol-derived signalling regulates ALUMINIUM SENSITIVE3 expression under aluminium stress in the shoots of Arabidopsis thaliana. Plant Sci 2021; 302:110711. [PMID: 33288018 DOI: 10.1016/j.plantsci.2020.110711] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [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: 04/17/2020] [Revised: 10/02/2020] [Accepted: 10/04/2020] [Indexed: 06/12/2023]
Abstract
To identify unknown regulatory mechanisms leading to aluminium (Al)-induction of the Al tolerance gene ALS3, we conducted an expression genome-wide association study (eGWAS) for ALS3 in the shoots of 95 Arabidopsis thaliana accessions in the presence of Al. The eGWAS was conducted using a mixed linear model with 145,940 genome-wide single nucleotide polymorphisms (SNPs) and the association results were validated using reverse genetics. We found that many SNPs from the eGWAS were associated with genes related to phosphatidylinositol metabolism as well as stress signal transduction, including Ca2+signals, inter-connected in a co-expression network. Of these, PLC9, CDPK32, ANAC071, DIR1, and a hypothetical protein (AT4G10470) possessed amino acid sequence/ gene expression level polymorphisms that were significantly associated with ALS3 expression level variation. Furthermore, T-DNA insertion mutants of PLC9, CDPK32, and ANAC071 suppressed shoot ALS3 expression in the presence of Al. This study clarified the regulatory mechanisms of ALS3 expression in the shoot and provided genetic evidence of the involvement of phosphatidylinositol-derived signal transduction under Al stress.
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Affiliation(s)
- Ayan Sadhukhan
- Applied Biological Sciences, Gifu University, Yanagido 1-1, Gifu, Gifu 501-1193, Japan
| | - Raj Kishan Agrahari
- Applied Biological Sciences, Gifu University, Yanagido 1-1, Gifu, Gifu 501-1193, Japan
| | - Liujie Wu
- Applied Biological Sciences, Gifu University, Yanagido 1-1, Gifu, Gifu 501-1193, Japan
| | - Toshihiro Watanabe
- Research Faculty of Agriculture, Hokkaido University, Kita-9, Nishi-9, Kitaku, Sapporo, 060-8589, Japan
| | - Yuki Nakano
- Applied Biological Sciences, Gifu University, Yanagido 1-1, Gifu, Gifu 501-1193, Japan
| | - Sanjib Kumar Panda
- Department of Biochemistry, Central University of Rajasthan, Rajasthan 305817, India
| | - Hiroyuki Koyama
- Applied Biological Sciences, Gifu University, Yanagido 1-1, Gifu, Gifu 501-1193, Japan
| | - Yuriko Kobayashi
- Applied Biological Sciences, Gifu University, Yanagido 1-1, Gifu, Gifu 501-1193, Japan.
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Sung YC, Yang CH, Yang CM, Lin CW, Huang DS, Huang YS, Hu FR, Chen PL, Chen TC. Genotypes Predispose Phenotypes-Clinical Features and Genetic Spectrum of ABCA4-Associated Retinal Dystrophies. Genes (Basel) 2020; 11:genes11121421. [PMID: 33261146 PMCID: PMC7759801 DOI: 10.3390/genes11121421] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/20/2020] [Revised: 11/12/2020] [Accepted: 11/25/2020] [Indexed: 12/31/2022] Open
Abstract
The ABCA4 gene is one of the most common disease-causing genes of inherited retinal degeneration. In this study, we report different phenotypes of ABCA4-associated retinal dystrophies in the Taiwanese population, its clinical progression, and its relationship with genetic characteristics. Thirty-seven subjects were recruited and all patients underwent serial ophthalmic examinations at a single medical center. Fundus autofluorescence (FAF) images were quantified for clinical evaluation, and panel-based next-generation sequencing testing was performed for genetic diagnosis. Visual preservation, disease progression, and genotype–phenotype correlation were analyzed. In this cohort, ABCA4-associated retinal degeneration presented as Stargardt disease 1 (STGD1, 62.16%), retinitis pigmentosa (32.43%), and cone-rod dystrophy (5.41%). STGD1 could be further divided into central and dispersed types. In each phenotype, the lesion areas quantified by FAF increased with age (p < 0.01) and correlated with poorer visual acuity. However, three patients had the foveal sparing phenotype and had relatively preserved visual acuity. Forty-two ABCA4 variants were identified as disease-causing, with c.1804C>T (p.Arg602Trp) the most frequent (37.84%). Patients with a combination of severe/null variants could have more extensive phenotypes, such as arRP and dispersed STGD1. This is the first cohort study of ABCA4-associated retinal degeneration in Taiwan with wide spectrums of both genotypic and phenotypic characteristics. An extremely high prevalence of c.1804C>T, which has not been reported in East Asia before, was noted. The extensiveness of retinal involvement might be regarded as a spectrum of ABCA4-associated retinal dystrophies. Different types of genetic variations could lead to distinctive phenotypes, according to the coding impact of variants.
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Affiliation(s)
- Yu-Chi Sung
- Department of Medical Education, National Taiwan University Hospital, Taipei 100, Taiwan;
| | - Chang-Hao Yang
- Department of Ophthalmology, National Taiwan University Hospital, Taipei 100, Taiwan; (C.-H.Y.); (C.-M.Y.); (C.-W.L.); (D.-S.H.); (Y.-S.H.); (F.-R.H.)
- Department of Ophthalmology, College of Medicine, National Taiwan University, Taipei 100, Taiwan
| | - Chung-May Yang
- Department of Ophthalmology, National Taiwan University Hospital, Taipei 100, Taiwan; (C.-H.Y.); (C.-M.Y.); (C.-W.L.); (D.-S.H.); (Y.-S.H.); (F.-R.H.)
- Department of Ophthalmology, College of Medicine, National Taiwan University, Taipei 100, Taiwan
| | - Chao-Wen Lin
- Department of Ophthalmology, National Taiwan University Hospital, Taipei 100, Taiwan; (C.-H.Y.); (C.-M.Y.); (C.-W.L.); (D.-S.H.); (Y.-S.H.); (F.-R.H.)
| | - Ding-Siang Huang
- Department of Ophthalmology, National Taiwan University Hospital, Taipei 100, Taiwan; (C.-H.Y.); (C.-M.Y.); (C.-W.L.); (D.-S.H.); (Y.-S.H.); (F.-R.H.)
| | - Yu-Shu Huang
- Department of Ophthalmology, National Taiwan University Hospital, Taipei 100, Taiwan; (C.-H.Y.); (C.-M.Y.); (C.-W.L.); (D.-S.H.); (Y.-S.H.); (F.-R.H.)
| | - Fung-Rong Hu
- Department of Ophthalmology, National Taiwan University Hospital, Taipei 100, Taiwan; (C.-H.Y.); (C.-M.Y.); (C.-W.L.); (D.-S.H.); (Y.-S.H.); (F.-R.H.)
- Department of Ophthalmology, College of Medicine, National Taiwan University, Taipei 100, Taiwan
| | - Pei-Lung Chen
- Graduate Institute of Clinical Medicine, College of Medicine, National Taiwan University, Taipei 100, Taiwan
- Graduate Institute of Medical Genomics and Proteomics, College of Medicine, National Taiwan University, Taipei 100, Taiwan
- Department of Medical Genetics, National Taiwan University Hospital, Taipei 100, Taiwan
- Correspondence: (P.-L.C.); (T.-C.C.); Tel.: +886-2-23123456 (ext. 71942) (P.-L.C.); +886-2-23123456 (ext. 63783) (T.-C.C.); Fax: +886-2-23934420 (T.-C.C.)
| | - Ta-Ching Chen
- Department of Ophthalmology, National Taiwan University Hospital, Taipei 100, Taiwan; (C.-H.Y.); (C.-M.Y.); (C.-W.L.); (D.-S.H.); (Y.-S.H.); (F.-R.H.)
- Graduate Institute of Clinical Medicine, College of Medicine, National Taiwan University, Taipei 100, Taiwan
- Correspondence: (P.-L.C.); (T.-C.C.); Tel.: +886-2-23123456 (ext. 71942) (P.-L.C.); +886-2-23123456 (ext. 63783) (T.-C.C.); Fax: +886-2-23934420 (T.-C.C.)
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Song S, Yan R, Wang C, Wang J, Sun H. Improvement of a Genetic Transformation System and Preliminary Study on the Function of LpABCB21 and LpPILS7 Based on Somatic Embryogenesis in Lilium pumilum DC. Fisch. Int J Mol Sci 2020; 21:E6784. [PMID: 32947885 PMCID: PMC7554901 DOI: 10.3390/ijms21186784] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/12/2020] [Revised: 09/07/2020] [Accepted: 09/14/2020] [Indexed: 11/16/2022] Open
Abstract
Auxin transport mediates the asymmetric distribution of auxin that determines the fate of cell development. Agrobacterium-mediated genetic transformation is an important technical means to study gene function. Our previous study showed that the expression levels of LpABCB21 and LpPILS7 are significantly up-regulated in the somatic embryogenesis (SE) of Lilium pumilum DC. Fisch. (L. pumilum), but the functions of both genes remain unclear. Here, the genetic transformation technology previously developed by our team based on the L. pumilum system was improved, and the genetic transformation efficiency increased by 5.7-13.0%. Use of overexpression and CRISPR/Cas9 technology produced three overexpression and seven mutant lines of LpABCB21, and seven overexpression and six mutant lines of LpPILS7. Analysis of the differences in somatic embryo induction of transgenic lines confirmed that LpABCB21 regulates the early formation of the somatic embryo; however, excessive expression level of LpABCB21 inhibits somatic embryo induction efficiency. LpPILS7 mainly regulates somatic embryo induction efficiency. This study provides a more efficient method of genetic transformation of L. pumilum. LpABCB21 and LpPILS7 are confirmed to have important regulatory roles in L. pumilum SE thus laying the foundation for subsequent studies of the molecular mechanism of Lilium SE.
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Affiliation(s)
- Shengli Song
- Key Laboratory of Protected Horticulture of Education Ministry and Liaoning Province, College of Horticulture, Shenyang Agricultural University, Shenyang 110866, China; (S.S.); (R.Y.); (C.W.); (J.W.)
| | - Rui Yan
- Key Laboratory of Protected Horticulture of Education Ministry and Liaoning Province, College of Horticulture, Shenyang Agricultural University, Shenyang 110866, China; (S.S.); (R.Y.); (C.W.); (J.W.)
| | - Chunxia Wang
- Key Laboratory of Protected Horticulture of Education Ministry and Liaoning Province, College of Horticulture, Shenyang Agricultural University, Shenyang 110866, China; (S.S.); (R.Y.); (C.W.); (J.W.)
| | - Jinxia Wang
- Key Laboratory of Protected Horticulture of Education Ministry and Liaoning Province, College of Horticulture, Shenyang Agricultural University, Shenyang 110866, China; (S.S.); (R.Y.); (C.W.); (J.W.)
| | - Hongmei Sun
- Key Laboratory of Protected Horticulture of Education Ministry and Liaoning Province, College of Horticulture, Shenyang Agricultural University, Shenyang 110866, China; (S.S.); (R.Y.); (C.W.); (J.W.)
- National and Local Joint Engineering Research Center of Northern Horticultural Facilities Design and Application Technology, Shenyang 110866, China
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Abbasifarid E, Sajjadi-Jazi SM, Beheshtian M, Samimi H, Larijani B, Haghpanah V. The Role of ATP-Binding Cassette Transporters in the Chemoresistance of Anaplastic Thyroid Cancer: A Systematic Review. Endocrinology 2019; 160:2015-2023. [PMID: 31271419 DOI: 10.1210/en.2019-00241] [Citation(s) in RCA: 20] [Impact Index Per Article: 4.0] [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] [Received: 03/24/2019] [Accepted: 06/28/2019] [Indexed: 12/21/2022]
Abstract
Anaplastic thyroid cancer (ATC) is an aggressive type of thyroid cancer with a high mortality rate. Cytotoxic drugs are among the treatment modalities usually used for ATC treatment. However, systemic chemotherapies for ATC have not been shown to have remarkable efficacy. ATP-binding cassette (ABC) transporters have been suggested as a possible mechanism in ATC resistance to chemotherapy. This systematic review was aimed to define the possible roles of ABC transporters in ATC resistance to chemotherapy. Numerous databases, including Scopus, Web of Science, PubMed, Cochrane Library, Ovid, ProQuest, and EBSCO, were searched for papers published since 1990, with predefined keywords. The literature searches were updated twice, in 2015 and 2017. All identified articles were reviewed, and 14 papers that met the inclusion criteria were selected. In the eligible studies, the roles of 10 out of 49 ABC transporters were evaluated; among them, three pumps (ABCB1, ABCC1, and ABCG2) were the most studied transporters in ATC samples. ABCC1 and ABCG2 had the highest expression rates in ATC, and ABCB1 ranked second among the inspected transporters. In conclusion, ABC transporters are the major determinants of ATC resistance to chemotherapy. By identifying these transporters, we can tailor the best treatment approach for patients with ATC. Additional studies are needed to define the exact role of each ABC transporter and other mechanisms in ATC drug resistance.
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Affiliation(s)
- Elnaz Abbasifarid
- Endocrinology and Metabolism Research Center, Endocrinology and Metabolism Clinical Sciences Institute, Tehran University of Medical Sciences, Tehran, Iran
| | - Sayed Mahmoud Sajjadi-Jazi
- Endocrinology and Metabolism Research Center, Endocrinology and Metabolism Clinical Sciences Institute, Tehran University of Medical Sciences, Tehran, Iran
- Cell Therapy and Regenerative Medicine Research Center, Endocrinology and Metabolism Molecular-Cellular Sciences Institute, Tehran University of Medical Sciences, Tehran, Iran
| | - Maryam Beheshtian
- Genetics Research Center, University of Social Welfare and Rehabilitation Sciences, Tehran, Iran
| | - Hilda Samimi
- Endocrinology and Metabolism Research Center, Endocrinology and Metabolism Clinical Sciences Institute, Tehran University of Medical Sciences, Tehran, Iran
| | - Bagher Larijani
- Endocrinology and Metabolism Research Center, Endocrinology and Metabolism Clinical Sciences Institute, Tehran University of Medical Sciences, Tehran, Iran
| | - Vahid Haghpanah
- Endocrinology and Metabolism Research Center, Endocrinology and Metabolism Clinical Sciences Institute, Tehran University of Medical Sciences, Tehran, Iran
- Personalized Medicine Research Center, Endocrinology and Metabolism Clinical Sciences Institute, Tehran University of Medical Sciences, Tehran, Iran
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De Roeck A, Van Broeckhoven C, Sleegers K. The role of ABCA7 in Alzheimer's disease: evidence from genomics, transcriptomics and methylomics. Acta Neuropathol 2019; 138:201-220. [PMID: 30903345 PMCID: PMC6660495 DOI: 10.1007/s00401-019-01994-1] [Citation(s) in RCA: 115] [Impact Index Per Article: 23.0] [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: 02/01/2019] [Revised: 03/18/2019] [Accepted: 03/18/2019] [Indexed: 12/12/2022]
Abstract
Genome-wide association studies (GWAS) originally identified ATP-binding cassette, sub-family A, member 7 (ABCA7), as a novel risk gene of Alzheimer’s disease (AD). Since then, accumulating evidence from in vitro, in vivo, and human-based studies has corroborated and extended this association, promoting ABCA7 as one of the most important risk genes of both early-onset and late-onset AD, harboring both common and rare risk variants with relatively large effect on AD risk. Within this review, we provide a comprehensive assessment of the literature on ABCA7, with a focus on AD-related human -omics studies (e.g. genomics, transcriptomics, and methylomics). In European and African American populations, indirect ABCA7 GWAS associations are explained by expansion of an ABCA7 variable number tandem repeat (VNTR), and a common premature termination codon (PTC) variant, respectively. Rare ABCA7 PTC variants are strongly enriched in AD patients, and some of these have displayed inheritance patterns resembling autosomal dominant AD. In addition, rare missense variants are more frequent in AD patients than healthy controls, whereas a common ABCA7 missense variant may protect from disease. Methylation at several CpG sites in the ABCA7 locus is significantly associated with AD. Furthermore, ABCA7 contains many different isoforms and ABCA7 splicing has been shown to associate with AD. Besides associations with disease status, these genetic and epigenetic ABCA7 markers also showed significant correlations with AD endophenotypes; in particular amyloid deposition and brain morphology. In conclusion, human-based –omics studies provide converging evidence of (partial) ABCA7 loss as an AD pathomechanism, and future studies should make clear if interventions on ABCA7 expression can serve as a valuable therapeutic target for AD.
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Affiliation(s)
- Arne De Roeck
- Neurodegenerative Brain Diseases Group, VIB Center for Molecular Neurology, University of Antwerp, CDE, Universiteitsplein 1, 2610, Antwerp, Belgium
- Biomedical Sciences, University of Antwerp, Antwerp, Belgium
| | - Christine Van Broeckhoven
- Neurodegenerative Brain Diseases Group, VIB Center for Molecular Neurology, University of Antwerp, CDE, Universiteitsplein 1, 2610, Antwerp, Belgium
- Biomedical Sciences, University of Antwerp, Antwerp, Belgium
| | - Kristel Sleegers
- Neurodegenerative Brain Diseases Group, VIB Center for Molecular Neurology, University of Antwerp, CDE, Universiteitsplein 1, 2610, Antwerp, Belgium.
- Biomedical Sciences, University of Antwerp, Antwerp, Belgium.
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9
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Willers C, Svitina H, Rossouw MJ, Swanepoel RA, Hamman JH, Gouws C. Models used to screen for the treatment of multidrug resistant cancer facilitated by transporter-based efflux. J Cancer Res Clin Oncol 2019; 145:1949-1976. [PMID: 31292714 DOI: 10.1007/s00432-019-02973-5] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [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: 03/26/2019] [Accepted: 07/04/2019] [Indexed: 01/09/2023]
Abstract
PURPOSE Efflux transporters of the adenosine triphosphate-binding cassette (ABC)-superfamily play an important role in the development of multidrug resistance (multidrug resistant; MDR) in cancer. The overexpression of these transporters can directly contribute to the failure of chemotherapeutic drugs. Several in vitro and in vivo models exist to screen for the efficacy of chemotherapeutic drugs against MDR cancer, specifically facilitated by efflux transporters. RESULTS This article reviews a range of efflux transporter-based MDR models used to test the efficacy of compounds to overcome MDR in cancer. These models are classified as either in vitro or in vivo and are further categorised as the most basic, conventional models or more complex and advanced systems. Each model's origin, advantages and limitations, as well as specific efflux transporter-based MDR applications are discussed. Accordingly, future modifications to existing models or new research approaches are suggested to develop prototypes that closely resemble the true nature of multidrug resistant cancer in the human body. CONCLUSIONS It is evident from this review that a combination of both in vitro and in vivo preclinical models can provide a better understanding of cancer itself, than using a single model only. However, there is still a clear lack of progression of these models from basic research to high-throughput clinical practice.
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Affiliation(s)
- Clarissa Willers
- Pharmacen™, Centre of Excellence for Pharmaceutical Sciences, North-West University, Private Bag X6001, Potchefstroom, 2520, South Africa
| | - Hanna Svitina
- Pharmacen™, Centre of Excellence for Pharmaceutical Sciences, North-West University, Private Bag X6001, Potchefstroom, 2520, South Africa
| | - Michael J Rossouw
- Pharmacen™, Centre of Excellence for Pharmaceutical Sciences, North-West University, Private Bag X6001, Potchefstroom, 2520, South Africa
| | - Roan A Swanepoel
- Pharmacen™, Centre of Excellence for Pharmaceutical Sciences, North-West University, Private Bag X6001, Potchefstroom, 2520, South Africa
| | - Josias H Hamman
- Pharmacen™, Centre of Excellence for Pharmaceutical Sciences, North-West University, Private Bag X6001, Potchefstroom, 2520, South Africa
| | - Chrisna Gouws
- Pharmacen™, Centre of Excellence for Pharmaceutical Sciences, North-West University, Private Bag X6001, Potchefstroom, 2520, South Africa.
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10
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Sheng Y, Yan X, Huang Y, Han Y, Zhang C, Ren Y, Fan T, Xiao F, Liu Y, Cao S. The WRKY transcription factor, WRKY13, activates PDR8 expression to positively regulate cadmium tolerance in Arabidopsis. Plant Cell Environ 2019; 42:891-903. [PMID: 30311662 DOI: 10.1111/pce.13457] [Citation(s) in RCA: 92] [Impact Index Per Article: 18.4] [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: 12/14/2017] [Revised: 09/20/2018] [Accepted: 10/04/2018] [Indexed: 05/17/2023]
Abstract
Cadmium (Cd) extrusion is an important mechanism conferring Cd tolerance by decreasing its accumulation in plants. Previous studies have identified an Arabidopsis ABC transporter, PDR8, as a Cd extrusion pump conferring Cd tolerance. However, the regulation of PDR8 in response to Cd stress is still largely unknown. In this study, we identified an Arabidopsis cadmium-tolerant dominant mutant, designated xcd3-D, from the XVE-tagging T-DNA insertion lines by a gain-of-function genetic screen. The corresponding gene was cloned and shown to encode a nuclear WRKY transcription factor WRKY13. Expression of WRKY13 was induced by Cd stress. Overexpression of WRKY13 resulted in decreased Cd accumulation and enhanced Cd tolerance, whereas loss-of-function of WRKY13 led to increased Cd accumulation and sensitivity. Further analysis showed that WRKY13 activates the transcription of PDR8 by directly binding to its promoter. Genetic analysis indicated that WRKY13 acts upstream of PDR8 to positively regulate Cd tolerance. Our results provide evidence that WRKY13 directly targets PDR8 to positively regulate Cd tolerance in Arabidopsis.
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Affiliation(s)
- Yibao Sheng
- School of Food Science and Engineering, Hefei University of Technology, Hefei, Anhui, China
| | - Xingxing Yan
- School of Food Science and Engineering, Hefei University of Technology, Hefei, Anhui, China
| | - Ying Huang
- School of Food Science and Engineering, Hefei University of Technology, Hefei, Anhui, China
| | - Yangyang Han
- School of Food Science and Engineering, Hefei University of Technology, Hefei, Anhui, China
| | - Cheng Zhang
- School of Food Science and Engineering, Hefei University of Technology, Hefei, Anhui, China
| | - Yongbing Ren
- School of Food Science and Engineering, Hefei University of Technology, Hefei, Anhui, China
| | - Tingting Fan
- School of Food Science and Engineering, Hefei University of Technology, Hefei, Anhui, China
| | - Fangming Xiao
- Department of Plant Sciences, University of Idaho, Moscow, Idaho
| | - Yongsheng Liu
- School of Food Science and Engineering, Hefei University of Technology, Hefei, Anhui, China
| | - Shuqing Cao
- School of Food Science and Engineering, Hefei University of Technology, Hefei, Anhui, China
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11
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Rindler TN, Stockman CA, Filuta AL, Brown KM, Snowball JM, Zhou W, Veldhuizen R, Zink EM, Dautel SE, Clair G, Ansong C, Xu Y, Bridges JP, Whitsett JA. Alveolar injury and regeneration following deletion of ABCA3. JCI Insight 2017; 2:97381. [PMID: 29263307 PMCID: PMC5752264 DOI: 10.1172/jci.insight.97381] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/11/2017] [Accepted: 11/08/2017] [Indexed: 12/18/2022] Open
Abstract
Adaptation to air breathing after birth is dependent upon the synthesis and secretion of pulmonary surfactant by alveolar type 2 (AT2) cells. Surfactant, a complex mixture of phospholipids and proteins, is secreted into the alveolus, where it reduces collapsing forces at the air-liquid interface to maintain lung volumes during the ventilatory cycle. ABCA3, an ATP-dependent Walker domain containing transport protein, is required for surfactant synthesis and lung function at birth. Mutations in ABCA3 cause severe surfactant deficiency and respiratory failure in newborn infants. We conditionally deleted the Abca3 gene in AT2 cells in the mature mouse lung. Loss of ABCA3 caused alveolar cell injury and respiratory failure. ABCA3-related lung dysfunction was associated with surfactant deficiency, inflammation, and alveolar-capillary leak. Extensive but incomplete deletion of ABCA3 caused alveolar injury and inflammation, and it initiated proliferation of progenitor cells, restoring ABCA3 expression, lung structure, and function. M2-like macrophages were recruited to sites of AT2 cell proliferation during the regenerative process and were present in lung tissue from patients with severe lung disease caused by mutations in ABCA3. The remarkable and selective regeneration of ABCA3-sufficient AT2 progenitor cells provides plausible approaches for future correction of ABCA3 and other genetic disorders associated with surfactant deficiency and acute interstitial lung disease.
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Affiliation(s)
- Tara N. Rindler
- Perinatal Institute, Cincinnati Children’s Hospital Medical Center, Division of Neonatology, Perinatal and Pulmonary Biology, Cincinnati, Ohio, USA
| | - Courtney A. Stockman
- Perinatal Institute, Cincinnati Children’s Hospital Medical Center, Division of Neonatology, Perinatal and Pulmonary Biology, Cincinnati, Ohio, USA
| | - Alyssa L. Filuta
- Perinatal Institute, Cincinnati Children’s Hospital Medical Center, Division of Neonatology, Perinatal and Pulmonary Biology, Cincinnati, Ohio, USA
| | - Kari M. Brown
- Perinatal Institute, Cincinnati Children’s Hospital Medical Center, Division of Neonatology, Perinatal and Pulmonary Biology, Cincinnati, Ohio, USA
| | - John M. Snowball
- Perinatal Institute, Cincinnati Children’s Hospital Medical Center, Division of Neonatology, Perinatal and Pulmonary Biology, Cincinnati, Ohio, USA
| | - Wenjia Zhou
- Lawson Health Research Institute, Departments of Physiology and Pharmacology, Medicine, Western University, London, Ontario, Canada
| | - Ruud Veldhuizen
- Lawson Health Research Institute, Departments of Physiology and Pharmacology, Medicine, Western University, London, Ontario, Canada
| | - Erika M. Zink
- Biological Science Division, Pacific Northwest National Laboratory (PNNL), Richland, Washington, USA
| | - Sydney E. Dautel
- Biological Science Division, Pacific Northwest National Laboratory (PNNL), Richland, Washington, USA
| | - Geremy Clair
- Biological Science Division, Pacific Northwest National Laboratory (PNNL), Richland, Washington, USA
| | - Charles Ansong
- Biological Science Division, Pacific Northwest National Laboratory (PNNL), Richland, Washington, USA
| | - Yan Xu
- Perinatal Institute, Cincinnati Children’s Hospital Medical Center, Division of Neonatology, Perinatal and Pulmonary Biology, Cincinnati, Ohio, USA
| | - James P. Bridges
- Perinatal Institute, Cincinnati Children’s Hospital Medical Center, Division of Neonatology, Perinatal and Pulmonary Biology, Cincinnati, Ohio, USA
| | - Jeffrey A. Whitsett
- Perinatal Institute, Cincinnati Children’s Hospital Medical Center, Division of Neonatology, Perinatal and Pulmonary Biology, Cincinnati, Ohio, USA
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12
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Anderson DMG, Ablonczy Z, Koutalos Y, Hanneken AM, Spraggins JM, Calcutt MW, Crouch RK, Caprioli RM, Schey KL. Bis(monoacylglycero)phosphate lipids in the retinal pigment epithelium implicate lysosomal/endosomal dysfunction in a model of Stargardt disease and human retinas. Sci Rep 2017; 7:17352. [PMID: 29229934 PMCID: PMC5725462 DOI: 10.1038/s41598-017-17402-1] [Citation(s) in RCA: 34] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/22/2017] [Accepted: 11/22/2017] [Indexed: 01/10/2023] Open
Abstract
Stargardt disease is a juvenile onset retinal degeneration, associated with elevated levels of lipofuscin and its bis-retinoid components, such as N-retinylidene-N-retinylethanolamine (A2E). However, the pathogenesis of Stargardt is still poorly understood and targeted treatments are not available. Utilizing high spatial and high mass resolution matrix assisted laser desorption ionization (MALDI) imaging mass spectrometry (IMS), we determined alterations of lipid profiles specifically localized to the retinal pigment epithelium (RPE) in Abca4 -/- Stargardt model mice compared to their relevant background strain. Extensive analysis by LC-MS/MS in both positive and negative ion mode was required to accurately confirm the identity of one highly expressed lipid class, bis(monoacylgylercoro)phosphate (BMP) lipids, and to distinguish them from isobaric species. The same BMP lipids were also detected in the RPE of healthy human retina. BMP lipids have been previously associated with the endosomal/lysosomal storage diseases Niemann-Pick and neuronal ceroid lipofuscinosis and have been reported to regulate cholesterol levels in endosomes. These results suggest that perturbations in lipid metabolism associated with late endosomal/lysosomal dysfunction may play a role in the pathogenesis of Stargardt disease and is evidenced in human retinas.
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Affiliation(s)
- David M G Anderson
- Mass Spectrometry Research Center and Department of Biochemistry, Vanderbilt University School of Medicine, Nashville, TN, USA
| | - Zsolt Ablonczy
- Department of Ophthalmology, Storm Eye Institute, Medical University of South Carolina, Charleston, SC, USA
- Preclinical Department, Ora Inc, Andover, MA, USA
| | - Yiannis Koutalos
- Department of Ophthalmology, Storm Eye Institute, Medical University of South Carolina, Charleston, SC, USA
| | - Anne M Hanneken
- Department of Molecular and Experimental Medicine, The Scripps Research Institute, La Jolla, CA, USA
| | - Jeffrey M Spraggins
- Mass Spectrometry Research Center and Department of Biochemistry, Vanderbilt University School of Medicine, Nashville, TN, USA
- Department of Biochemistry, Vanderbilt University, Nashville, TN, USA
- Department of Chemistry, Nashville, TN, USA
| | - M Wade Calcutt
- Mass Spectrometry Research Center and Department of Biochemistry, Vanderbilt University School of Medicine, Nashville, TN, USA
| | - Rosalie K Crouch
- Department of Ophthalmology, Storm Eye Institute, Medical University of South Carolina, Charleston, SC, USA
| | - Richard M Caprioli
- Mass Spectrometry Research Center and Department of Biochemistry, Vanderbilt University School of Medicine, Nashville, TN, USA
- Department of Biochemistry, Vanderbilt University, Nashville, TN, USA
- Department of Chemistry, Nashville, TN, USA
- Department of Pharmacology and Medicine, Vanderbilt University, Nashville, TN, USA
| | - Kevin L Schey
- Mass Spectrometry Research Center and Department of Biochemistry, Vanderbilt University School of Medicine, Nashville, TN, USA.
- Department of Biochemistry, Vanderbilt University, Nashville, TN, USA.
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13
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Zhu Y, Lu GH, Bian ZW, Wu FY, Pang YJ, Wang XM, Yang RW, Tang CY, Qi JL, Yang YH. Involvement of LeMDR, an ATP-binding cassette protein gene, in shikonin transport and biosynthesis in Lithospermum erythrorhizon. BMC Plant Biol 2017; 17:198. [PMID: 29132307 PMCID: PMC5683320 DOI: 10.1186/s12870-017-1148-6] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/13/2016] [Accepted: 11/01/2017] [Indexed: 05/24/2023]
Abstract
BACKGROUND Shikonin is a naphthoquinone secondary metabolite with important medicinal value and is found in Lithospermum erythrorhizon. Considering the limited knowledge on the membrane transport mechanism of shikonin, this study investigated such molecular mechanism. RESULTS We successfully isolated an ATP-binding cassette protein gene, LeMDR, from L. erythrorhizon. LeMDR is predominantly expressed in L. erythrorhizon roots, where shikonin accumulated. Functional analysis of LeMDR by using the yeast cell expression system revealed that LeMDR is possibly involved in the shikonin efflux transport. The accumulation of shikonin is lower in yeast cells transformed with LeMDR-overexpressing vector than that with empty vector. The transgenic hairy roots of L. erythrorhizon overexpressing LeMDR (MDRO) significantly enhanced shikonin production, whereas the RNA interference of LeMDR (MDRi) displayed a reverse trend. Moreover, the mRNA expression level of LeMDR was up-regulated by treatment with shikonin and shikonin-positive regulators, methyl jasmonate and indole-3-acetic acid. There might be a relationship of mutual regulation between the expression level of LeMDR and shikonin biosynthesis. CONCLUSIONS Our findings demonstrated the important role of LeMDR in transmembrane transport and biosynthesis of shikonin.
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Affiliation(s)
- Yu Zhu
- Institute of Plant Molecular Biology, State Key Laboratory of Pharmaceutical Biotechnology, School of Life Sciences, Nanjing University, No. 163 Xianlin Avenue, Qixia District, Nanjing, 210023 People’s Republic of China
- Co-Innovation Center for Sustainable Forestry in Southern China, Nanjing Forestry University, Nanjing, 210037 People’s Republic of China
| | - Gui-Hua Lu
- Institute of Plant Molecular Biology, State Key Laboratory of Pharmaceutical Biotechnology, School of Life Sciences, Nanjing University, No. 163 Xianlin Avenue, Qixia District, Nanjing, 210023 People’s Republic of China
- Co-Innovation Center for Sustainable Forestry in Southern China, Nanjing Forestry University, Nanjing, 210037 People’s Republic of China
| | - Zhuo-Wu Bian
- Institute of Plant Molecular Biology, State Key Laboratory of Pharmaceutical Biotechnology, School of Life Sciences, Nanjing University, No. 163 Xianlin Avenue, Qixia District, Nanjing, 210023 People’s Republic of China
- Co-Innovation Center for Sustainable Forestry in Southern China, Nanjing Forestry University, Nanjing, 210037 People’s Republic of China
| | - Feng-Yao Wu
- Institute of Plant Molecular Biology, State Key Laboratory of Pharmaceutical Biotechnology, School of Life Sciences, Nanjing University, No. 163 Xianlin Avenue, Qixia District, Nanjing, 210023 People’s Republic of China
- Co-Innovation Center for Sustainable Forestry in Southern China, Nanjing Forestry University, Nanjing, 210037 People’s Republic of China
| | - Yan-Jun Pang
- Institute of Plant Molecular Biology, State Key Laboratory of Pharmaceutical Biotechnology, School of Life Sciences, Nanjing University, No. 163 Xianlin Avenue, Qixia District, Nanjing, 210023 People’s Republic of China
- Co-Innovation Center for Sustainable Forestry in Southern China, Nanjing Forestry University, Nanjing, 210037 People’s Republic of China
| | - Xiao-Ming Wang
- Institute of Plant Molecular Biology, State Key Laboratory of Pharmaceutical Biotechnology, School of Life Sciences, Nanjing University, No. 163 Xianlin Avenue, Qixia District, Nanjing, 210023 People’s Republic of China
- Co-Innovation Center for Sustainable Forestry in Southern China, Nanjing Forestry University, Nanjing, 210037 People’s Republic of China
| | - Rong-Wu Yang
- Institute of Plant Molecular Biology, State Key Laboratory of Pharmaceutical Biotechnology, School of Life Sciences, Nanjing University, No. 163 Xianlin Avenue, Qixia District, Nanjing, 210023 People’s Republic of China
- Co-Innovation Center for Sustainable Forestry in Southern China, Nanjing Forestry University, Nanjing, 210037 People’s Republic of China
| | - Cheng-Yi Tang
- Institute of Plant Molecular Biology, State Key Laboratory of Pharmaceutical Biotechnology, School of Life Sciences, Nanjing University, No. 163 Xianlin Avenue, Qixia District, Nanjing, 210023 People’s Republic of China
- Co-Innovation Center for Sustainable Forestry in Southern China, Nanjing Forestry University, Nanjing, 210037 People’s Republic of China
| | - Jin-Liang Qi
- Institute of Plant Molecular Biology, State Key Laboratory of Pharmaceutical Biotechnology, School of Life Sciences, Nanjing University, No. 163 Xianlin Avenue, Qixia District, Nanjing, 210023 People’s Republic of China
- Co-Innovation Center for Sustainable Forestry in Southern China, Nanjing Forestry University, Nanjing, 210037 People’s Republic of China
| | - Yong-Hua Yang
- Institute of Plant Molecular Biology, State Key Laboratory of Pharmaceutical Biotechnology, School of Life Sciences, Nanjing University, No. 163 Xianlin Avenue, Qixia District, Nanjing, 210023 People’s Republic of China
- Co-Innovation Center for Sustainable Forestry in Southern China, Nanjing Forestry University, Nanjing, 210037 People’s Republic of China
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14
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Pomozi V, Brampton C, van de Wetering K, Zoll J, Calio B, Pham K, Owens JB, Marh J, Moisyadi S, Váradi A, Martin L, Bauer C, Erdmann J, Aherrahrou Z, Le Saux O. Pyrophosphate Supplementation Prevents Chronic and Acute Calcification in ABCC6-Deficient Mice. Am J Pathol 2017; 187:1258-1272. [PMID: 28416300 DOI: 10.1016/j.ajpath.2017.02.009] [Citation(s) in RCA: 52] [Impact Index Per Article: 7.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/02/2017] [Accepted: 02/16/2017] [Indexed: 12/28/2022]
Abstract
Soft tissue calcification occurs in several common acquired pathologies, such as diabetes and hypercholesterolemia, or can result from genetic disorders. ABCC6, a transmembrane transporter primarily expressed in liver and kidneys, initiates a molecular pathway inhibiting ectopic calcification. ABCC6 facilitates the cellular efflux of ATP, which is rapidly converted into pyrophosphate (PPi), a major calcification inhibitor. Heritable mutations in ABCC6 underlie the incurable calcification disorder pseudoxanthoma elasticum and some cases of generalized arterial calcification of infancy. Herein, we determined that the administration of PPi and the bisphosphonate etidronate to Abcc6-/- mice fully inhibited the acute dystrophic cardiac calcification phenotype, whereas alendronate had no significant effect. We also found that daily injection of PPi to Abcc6-/- mice over several months prevented the development of pseudoxanthoma elasticum-like spontaneous calcification, but failed to reverse already established lesions. Furthermore, we found that the expression of low amounts of the human ABCC6 in liver of transgenic Abcc6-/- mice, resulting in only a 27% increase in plasma PPi levels, led to a major reduction in acute and chronic calcification phenotypes. This proof-of-concept study shows that the development of both acute and chronic calcification associated with ABCC6 deficiency can be prevented by compensating PPi deficits, even partially. Our work indicates that PPi substitution represents a promising strategy to treat ABCC6-dependent calcification disorders.
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Affiliation(s)
- Viola Pomozi
- Department of Cell and Molecular Biology, John A. Burns School of Medicine, University of Hawaii, Honolulu, Hawaii
| | - Christopher Brampton
- Department of Cell and Molecular Biology, John A. Burns School of Medicine, University of Hawaii, Honolulu, Hawaii
| | - Koen van de Wetering
- Department of Dermatology and Cutaneous Biology, Sidney Kimmel Medical College, PXE International Center of Excellence in Research and Clinical Care, Thomas Jefferson University, Philadelphia, Pennsylvania
| | - Janna Zoll
- Department of Cell and Molecular Biology, John A. Burns School of Medicine, University of Hawaii, Honolulu, Hawaii
| | - Bianca Calio
- Department of Cell and Molecular Biology, John A. Burns School of Medicine, University of Hawaii, Honolulu, Hawaii
| | - Kevin Pham
- Department of Cell and Molecular Biology, John A. Burns School of Medicine, University of Hawaii, Honolulu, Hawaii
| | - Jesse B Owens
- Institute for Biogenesis Research, John A. Burns School of Medicine, University of Hawaii, Honolulu, Hawaii
| | - Joel Marh
- Institute for Biogenesis Research, John A. Burns School of Medicine, University of Hawaii, Honolulu, Hawaii
| | - Stefan Moisyadi
- Institute for Biogenesis Research, John A. Burns School of Medicine, University of Hawaii, Honolulu, Hawaii
| | - András Váradi
- Institute of Enzymology, Research Centre for Natural Sciences, Hungarian Academy of Sciences, Budapest, Hungary
| | - Ludovic Martin
- Université Bretagne-Loire, Integrated Neurovascular and Mitochondrial Biology, National Center for Scientific Research 6214/INSERM 1083, Angers, France; University Hospital Angers, Center for PXE Consultation, Angers, France
| | - Carolin Bauer
- Institut für Integrative und Experimentelle Genomik Universität zu Lübeck, German Centre for Cardiovascular Research, Partner Site Hamburg/Kiel/Lübeck, Germany; University Heart Centre Lübeck, Universität zu Lübeck, Lübeck, Germany
| | - Jeanette Erdmann
- Institut für Integrative und Experimentelle Genomik Universität zu Lübeck, German Centre for Cardiovascular Research, Partner Site Hamburg/Kiel/Lübeck, Germany; University Heart Centre Lübeck, Universität zu Lübeck, Lübeck, Germany
| | - Zouhair Aherrahrou
- Institut für Integrative und Experimentelle Genomik Universität zu Lübeck, German Centre for Cardiovascular Research, Partner Site Hamburg/Kiel/Lübeck, Germany; University Heart Centre Lübeck, Universität zu Lübeck, Lübeck, Germany
| | - Olivier Le Saux
- Department of Cell and Molecular Biology, John A. Burns School of Medicine, University of Hawaii, Honolulu, Hawaii.
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15
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Zorina A, Sinetova MA, Kupriyanova EV, Mironov KS, Molkova I, Nazarenko LV, Zinchenko VV, Los DA. Synechocystis mutants defective in manganese uptake regulatory system, ManSR, are hypersensitive to strong light. Photosynth Res 2016; 130:11-17. [PMID: 26719062 DOI: 10.1007/s11120-015-0214-x] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [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: 11/10/2015] [Accepted: 12/18/2015] [Indexed: 06/05/2023]
Abstract
High affinity transport of manganese ions (Mn2+) in cyanobacteria is carried by an ABC-type transporter, encoded by the mntCAB operon, which is derepressed by the deficiency of Mn2+. Transcription of this operon is negatively regulated by the two-component system consisting of a sensory histidine kinase ManS and DNA-binding response regulator ManR. In this study, we examined two Synechocystis mutants, defective in ManS and ManR. These mutants were unable to grow on high concentrations of manganese. Furthermore, they were sensitive to high light intensity and unable to recover after short-term photoinhibition. Under standard illumination and Mn2+ concentration, mutant cells revealed the elevated levels of transcripts of genes involved in the formation of Photosystem II (psbA, psbD, psbC, pap-operon). This finding suggests that, in mutant cells, the PSII is sensitive to high concentrations of Mn2+ even at relatively low light intensity.
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Affiliation(s)
- Anna Zorina
- Institute of Plant Physiology, Russian Academy of Sciences, Botanicheskaya Street 35, Moscow, Russia, 127276
| | - Maria A Sinetova
- Institute of Plant Physiology, Russian Academy of Sciences, Botanicheskaya Street 35, Moscow, Russia, 127276
| | - Elena V Kupriyanova
- Institute of Plant Physiology, Russian Academy of Sciences, Botanicheskaya Street 35, Moscow, Russia, 127276
| | - Kirill S Mironov
- Institute of Plant Physiology, Russian Academy of Sciences, Botanicheskaya Street 35, Moscow, Russia, 127276
| | - Irina Molkova
- Institute of Plant Physiology, Russian Academy of Sciences, Botanicheskaya Street 35, Moscow, Russia, 127276
| | - Lyudmila V Nazarenko
- Moscow City Teacher Training University, 2nd Agricultural Passage 4, Moscow, Russia, 129226
| | | | - Dmitry A Los
- Institute of Plant Physiology, Russian Academy of Sciences, Botanicheskaya Street 35, Moscow, Russia, 127276.
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16
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Sun D, Zhang X, Li S, Jiang CZ, Zhang Y, Niu L. LrABCF1, a GCN-type ATP-binding cassette transporter from Lilium regale, is involved in defense responses against viral and fungal pathogens. Planta 2016; 244:1185-1199. [PMID: 27485641 DOI: 10.1007/s00425-016-2576-5] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [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: 05/11/2016] [Accepted: 07/27/2016] [Indexed: 05/02/2023]
Abstract
The L. regale ATP-binding cassette transporter gene, LrABCF1 belonging to GCN subfamily, functions as a positive regulator of plant defense against Cucumber mosaic virus, Tobacco rattle virus , and Botrytis cinerea in petunia. ATP-binding cassette (ABC) transporters are essential for membrane translocation in diverse biological processes, such as plant development and defense response. Here, a general control non-derepressible (GCN)-type ABC transporter gene, designated LrABCF1, was identified from Cucumber mosaic virus (CMV)-induced cDNA library of L. regale. LrABCF1 was up-regulated upon inoculation with CMV and Lily mottle virus (LMoV). Salicylic acid (SA) and ethylene (ET) application and treatments with abiotic stresses such as cold, high salinity, and wounding increased the transcript abundances of LrABCF1. Constitutive overexpression of LrABCF1 in petunia (Petunia × hybrida) resulted in an impairment of plant growth and development. LrABCF1 overexpression conferred reduced susceptibility to CMV, Tobacco rattle virus (TRV), and B. cinerea infection in transgenic petunia plants, accompanying by elevated transcripts of PhGCN2 and a few defense-related genes in SA-signaling pathway. Our data indicate that LrABCF1 positively modulates viral and fungal resistance.
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Affiliation(s)
- Daoyang Sun
- College of Landscape Architecture and Arts, Northwest A&F University, Yangling, Shaanxi, 712100, People's Republic of China
| | - Xinguo Zhang
- College of Landscape Architecture and Arts, Northwest A&F University, Yangling, Shaanxi, 712100, People's Republic of China
| | - Shaohua Li
- College of Landscape Architecture and Arts, Northwest A&F University, Yangling, Shaanxi, 712100, People's Republic of China
| | - Cai-Zhong Jiang
- Crops Pathology and Genetic Research Unit, United States Department of Agriculture, Agricultural Research Service, Davis, CA, 95616, USA.
- Department of Plant Sciences, University of California at Davis, Davis, CA, 95616, USA.
| | - Yanlong Zhang
- College of Landscape Architecture and Arts, Northwest A&F University, Yangling, Shaanxi, 712100, People's Republic of China.
| | - Lixin Niu
- College of Landscape Architecture and Arts, Northwest A&F University, Yangling, Shaanxi, 712100, People's Republic of China.
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17
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Kuromori T, Fujita M, Urano K, Tanabata T, Sugimoto E, Shinozaki K. Overexpression of AtABCG25 enhances the abscisic acid signal in guard cells and improves plant water use efficiency. Plant Sci 2016; 251:75-81. [PMID: 27593465 DOI: 10.1016/j.plantsci.2016.02.019] [Citation(s) in RCA: 28] [Impact Index Per Article: 3.5] [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: 12/28/2015] [Revised: 02/24/2016] [Accepted: 02/29/2016] [Indexed: 05/06/2023]
Abstract
In addition to improving drought tolerance, improvement of water use efficiency is a major challenge in plant physiology. Due to their trade-off relationships, it is generally considered that achieving stress tolerance is incompatible with maintaining stable growth. Abscisic acid (ABA) is a key phytohormone that regulates the balance between intrinsic growth and environmental responses. Previously, we identified AtABCG25 as a cell-membrane ABA transporter that export ABA from the inside to the outside of cells. AtABCG25-overexpressing plants showed a lower transpiration phenotype without any growth retardation. Here, we dissected this useful trait using precise phenotyping approaches. AtABCG25 overexpression stimulated a local ABA response in guard cells. Furthermore, AtABCG25 overexpression enhanced drought tolerance, probably resulting from maintenance of water contents over the common threshold for survival after drought stress treatment. Finally, we observed enhanced water use efficiency by overexpression of AtABCG25, in addition to drought tolerance. These results were consistent with the function of AtABCG25 as an ABA efflux transporter. This unique trait may be generally useful for improving the water use efficiency and drought tolerance of plants.
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Affiliation(s)
- Takashi Kuromori
- Gene Discovery Research Group, RIKEN Center for Sustainable Resource Science, Yokohama, Kanagawa 230-0045, Japan
| | - Miki Fujita
- Gene Discovery Research Group, RIKEN Center for Sustainable Resource Science, Tsukuba, Ibaraki 305-0074, Japan
| | - Kaoru Urano
- Gene Discovery Research Group, RIKEN Center for Sustainable Resource Science, Tsukuba, Ibaraki 305-0074, Japan
| | - Takanari Tanabata
- Gene Discovery Research Group, RIKEN Center for Sustainable Resource Science, Tsukuba, Ibaraki 305-0074, Japan
| | - Eriko Sugimoto
- Gene Discovery Research Group, RIKEN Center for Sustainable Resource Science, Yokohama, Kanagawa 230-0045, Japan
| | - Kazuo Shinozaki
- Gene Discovery Research Group, RIKEN Center for Sustainable Resource Science, Yokohama, Kanagawa 230-0045, Japan; Gene Discovery Research Group, RIKEN Center for Sustainable Resource Science, Tsukuba, Ibaraki 305-0074, Japan.
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18
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Petropoulos S, Kalabis GM, Gibb W, Matthews SG. Functional Changes of Mouse Placental Multidrug Resistance Phosphoglycoprotein (ABCB1) With Advancing Gestation and Regulation by Progesterone. Reprod Sci 2016; 14:321-8. [PMID: 17644804 DOI: 10.1177/1933719107303856] [Citation(s) in RCA: 41] [Impact Index Per Article: 5.1] [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: 11/15/2022]
Abstract
Multidrug resistance phosphoglycoprotein (ABCB1) has been shown to limit maternal-fetal transfer by actively excluding ABCB1 substrates. The authors have previously demonstrated a marked decrease in placental ABCB1 expression in the human and mouse with advancing gestation. In the present study, it is hypothesized that the decrease in ABCB1 expression will result in increased transplacental transfer of ABCB1 substrates over the second half of gestation and that progesterone exhibits a regulatory role on placental ABCB1 expression and function. The authors demonstrate a significant increase in transplacental transfer of [(3)H]digoxin (an ABCB1 substrate) in late gestation (E18.5; P < .001) when compared to earlier embryonic days. Furthermore, maternal plasma progesterone levels did not influence expression or function of ABCB1. The authors conclude that the fetus is increasingly exposed to both endogenous and exogenous substrates of ABCB1 present in the maternal circulation with advancing gestation and that progesterone does not elicit a regulatory role on placental ABCB1 expression or function in vivo.
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19
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Hu T, Li Z, Gao CY, Cho CH. Mechanisms of drug resistance in colon cancer and its therapeutic strategies. World J Gastroenterol 2016; 22:6876-6889. [PMID: 27570424 PMCID: PMC4974586 DOI: 10.3748/wjg.v22.i30.6876] [Citation(s) in RCA: 235] [Impact Index Per Article: 29.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/15/2016] [Revised: 05/24/2016] [Accepted: 06/13/2016] [Indexed: 02/06/2023] Open
Abstract
Drug resistance develops in nearly all patients with colon cancer, leading to a decrease in the therapeutic efficacies of anticancer agents. This review provides an up-to-date summary on over-expression of ATP-binding cassette (ABC) transporters and evasion of apoptosis, two representatives of transport-based and non-transport-based mechanisms of drug resistance, as well as their therapeutic strategies. Different ABC transporters were found to be up-regulated in colon cancer, which can facilitate the efflux of anticancer drugs out of cancer cells and decrease their therapeutic effects. Inhibition of ABC transporters by suppressing their protein expressions or co-administration of modulators has been proven as an effective approach to sensitize drug-resistant cancer cells to anticancer drugs in vitro. On the other hand, evasion of apoptosis observed in drug-resistant cancers also results in drug resistance to anticancer agents, especially to apoptosis inducers. Restoration of apoptotic signals by BH3 mimetics or epidermal growth factor receptor inhibitors and inhibition of cancer cell growth by alternative cell death pathways, such as autophagy, are effective means to treat such resistant cancer types. Given that the drug resistance mechanisms are different among colon cancer patients and may change even in a single patient at different stages, personalized and specific combination therapy is proposed to be more effective and safer for the reversal of drug resistance in clinics.
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Bhati KK, Alok A, Kumar A, Kaur J, Tiwari S, Pandey AK. Silencing of ABCC13 transporter in wheat reveals its involvement in grain development, phytic acid accumulation and lateral root formation. J Exp Bot 2016; 67:4379-89. [PMID: 27342224 PMCID: PMC5301939 DOI: 10.1093/jxb/erw224] [Citation(s) in RCA: 51] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/18/2023]
Abstract
Low phytic acid is a trait desired in cereal crops and can be achieved by manipulating the genes involved either in its biosynthesis or its transport in the vacuoles. Previously, we have demonstrated that the wheat TaABCC13 protein is a functional transporter, primarily involved in heavy metal tolerance, and a probable candidate gene to achieve low phytate wheat. In the current study, RNA silencing was used to knockdown the expression of TaABCC13 in order to evaluate its functional importance in wheat. Transgenic plants with significantly reduced TaABCC13 transcripts in either seeds or roots were selected for further studies. Homozygous RNAi lines K1B4 and K4G7 exhibited 34-22% reduction of the phytic acid content in the mature grains (T4 seeds). These transgenic lines were defective for spike development, as characterized by reduced grain filling and numbers of spikelets. The seeds of transgenic wheat had delayed germination, but the viability of the seedlings was unaffected. Interestingly, early emergence of lateral roots was observed in TaABCC13-silenced lines as compared to non-transgenic lines. In addition, these lines also had defects in metal uptake and development of lateral roots in the presence of cadmium stress. Our results suggest roles of TaABCC13 in lateral root initiation and enhanced sensitivity towards heavy metals. Taken together, these data demonstrate that wheat ABCC13 is functionally important for grain development and plays an important role during detoxification of heavy metals.
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Affiliation(s)
- Kaushal Kumar Bhati
- National Agri-Food Biotechnology Institute (Department of Biotechnology), C-127, Industrial Area, Phase VIII, S.A.S. Nagar, Mohali-160071, Punjab, India
| | - Anshu Alok
- National Agri-Food Biotechnology Institute (Department of Biotechnology), C-127, Industrial Area, Phase VIII, S.A.S. Nagar, Mohali-160071, Punjab, India
| | - Anil Kumar
- National Agri-Food Biotechnology Institute (Department of Biotechnology), C-127, Industrial Area, Phase VIII, S.A.S. Nagar, Mohali-160071, Punjab, India
| | - Jagdeep Kaur
- Department of Biotechnology, Panjab University, Chandigarh, Punjab, India
| | - Siddharth Tiwari
- National Agri-Food Biotechnology Institute (Department of Biotechnology), C-127, Industrial Area, Phase VIII, S.A.S. Nagar, Mohali-160071, Punjab, India
| | - Ajay Kumar Pandey
- National Agri-Food Biotechnology Institute (Department of Biotechnology), C-127, Industrial Area, Phase VIII, S.A.S. Nagar, Mohali-160071, Punjab, India
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21
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Sassi C, Nalls MA, Ridge PG, Gibbs JR, Ding J, Lupton MK, Troakes C, Lunnon K, Al-Sarraj S, Brown KS, Medway C, Clement N, Lord J, Turton J, Bras J, Almeida MR, Holstege H, Louwersheimer E, van der Flier WM, Scheltens P, Van Swieten JC, Santana I, Oliveira C, Morgan K, Powell JF, Kauwe JS, Cruchaga C, Goate AM, Singleton AB, Guerreiro R, Hardy J. ABCA7 p.G215S as potential protective factor for Alzheimer's disease. Neurobiol Aging 2016; 46:235.e1-9. [PMID: 27289440 PMCID: PMC5024078 DOI: 10.1016/j.neurobiolaging.2016.04.004] [Citation(s) in RCA: 33] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/09/2016] [Revised: 03/23/2016] [Accepted: 04/10/2016] [Indexed: 01/22/2023]
Abstract
Genome-wide association studies (GWASs) have been effective approaches to dissect common genetic variability underlying complex diseases in a systematic and unbiased way. Recently, GWASs have led to the discovery of over 20 susceptibility loci for Alzheimer's disease (AD). Despite the evidence showing the contribution of these loci to AD pathogenesis, their genetic architecture has not been extensively investigated, leaving the possibility that low frequency and rare coding variants may also occur and contribute to the risk of disease. We have used exome and genome sequencing data to analyze the single independent and joint effect of rare and low-frequency protein coding variants in 9 AD GWAS loci with the strongest effect sizes after APOE (BIN1, CLU, CR1, PICALM, MS4A6A, ABCA7, EPHA1, CD33, and CD2AP) in a cohort of 332 sporadic AD cases and 676 elderly controls of British and North-American ancestry. We identified coding variability in ABCA7 as contributing to AD risk. This locus harbors a low-frequency coding variant (p.G215S, rs72973581, minor allele frequency = 4.3%) conferring a modest but statistically significant protection against AD (p-value = 0.024, odds ratio = 0.57, 95% confidence interval = 0.41–0.80). Notably, our results are not driven by an enrichment of loss of function variants in ABCA7, recently reported as main pathogenic factor underlying AD risk at this locus. In summary, our study confirms the role of ABCA7 in AD and provides new insights that should address functional studies.
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Affiliation(s)
- Celeste Sassi
- Reta Lila, Weston Research Laboratories, Department of Molecular Neuroscience, UCL Institute of Neurology, London, UK; Laboratory of Neurogenetics, National Institute on Aging, National Institutes of Health, Bethesda, MD, USA; Department of Experimental Neurology, Center for Stroke Research Berlin (CSB), Charite' Universitätmedizin, Berlin, Germany; German Center for Neurodegenerative Diseases (DZNE), Berlin site, Germany
| | - Michael A Nalls
- Laboratory of Neurogenetics, National Institute on Aging, National Institutes of Health, Bethesda, MD, USA
| | - Perry G Ridge
- Department of Biology, Brigham Young University, Provo, UT, USA
| | - Jesse R Gibbs
- Laboratory of Neurogenetics, National Institute on Aging, National Institutes of Health, Bethesda, MD, USA
| | - Jinhui Ding
- Laboratory of Neurogenetics, National Institute on Aging, National Institutes of Health, Bethesda, MD, USA
| | - Michelle K Lupton
- King's College London, Institute of Psychiatry, Psychology and Neuroscience, London, UK; QIMR Berghofer Medical Research Institute, Brisbane, Queensland, Australia
| | - Claire Troakes
- King's College London, Institute of Psychiatry, Psychology and Neuroscience, London, UK
| | - Katie Lunnon
- King's College London, Institute of Psychiatry, Psychology and Neuroscience, London, UK; Institute of Biomedical and Clinical Science, University of Exeter Medical School, Exeter, Devon, UK
| | - Safa Al-Sarraj
- King's College London, Institute of Psychiatry, Psychology and Neuroscience, London, UK
| | - Kristelle S Brown
- Translation Cell Sciences-Human Genetics, School of Life Sciences, Queens Medical Centre, University of Nottingham, Nottingham, UK
| | - Christopher Medway
- Translation Cell Sciences-Human Genetics, School of Life Sciences, Queens Medical Centre, University of Nottingham, Nottingham, UK
| | - Naomi Clement
- Translation Cell Sciences-Human Genetics, School of Life Sciences, Queens Medical Centre, University of Nottingham, Nottingham, UK
| | - Jenny Lord
- Translation Cell Sciences-Human Genetics, School of Life Sciences, Queens Medical Centre, University of Nottingham, Nottingham, UK
| | - James Turton
- Translation Cell Sciences-Human Genetics, School of Life Sciences, Queens Medical Centre, University of Nottingham, Nottingham, UK
| | - Jose Bras
- Reta Lila, Weston Research Laboratories, Department of Molecular Neuroscience, UCL Institute of Neurology, London, UK
| | - Maria R Almeida
- Neurogenetics Laboratory, Center for Neuroscience and Cell Biology, University of Coimbra, Coimbra, Portugal
| | - Henne Holstege
- Department of Neurology, Alzheimer Center, VU University Medical Center, Neuroscience Campus Amsterdam, Amsterdam, the Netherlands
| | - Eva Louwersheimer
- Department of Neurology, Alzheimer Center, VU University Medical Center, Neuroscience Campus Amsterdam, Amsterdam, the Netherlands
| | - Wiesje M van der Flier
- Department of Neurology, Alzheimer Center, VU University Medical Center, Neuroscience Campus Amsterdam, Amsterdam, the Netherlands
| | - Philip Scheltens
- Department of Neurology, Alzheimer Center, VU University Medical Center, Neuroscience Campus Amsterdam, Amsterdam, the Netherlands
| | - John C Van Swieten
- Department of Neurology, Alzheimer Center, VU University Medical Center, Neuroscience Campus Amsterdam, Amsterdam, the Netherlands; Department of Neurology, Erasmus Medical Centre, Rotterdam, the Netherlands
| | - Isabel Santana
- Neurology Department, Centro Hospitalar e Universitário de Coimbra, Coimbra, Portugal; Faculty of Medicine, Coimbra University, Coimbra, Portugal
| | - Catarina Oliveira
- CNC-Center for Neuroscience and Cell Biology, University of Coimbra, Coimbra, Portugal; Laboratory of Biochemistry, Faculty of Medicine, University of Coimbra, Coimbra, Portugal
| | - Kevin Morgan
- Translation Cell Sciences-Human Genetics, School of Life Sciences, Queens Medical Centre, University of Nottingham, Nottingham, UK
| | - John F Powell
- King's College London, Institute of Psychiatry, Psychology and Neuroscience, London, UK
| | - John S Kauwe
- Department of Biology, Brigham Young University, Provo, UT, USA; Department of Neuroscience, Brigham Young University, Provo, UT, USA
| | - Carlos Cruchaga
- Division of Biology and Biomedical Sciences, Washington University, St. Louis, MO, USA
| | - Alison M Goate
- Icahn School of Medicine at Mount Sinai, Icahn Medical Institute, New York, NY, USA
| | - Andrew B Singleton
- Laboratory of Neurogenetics, National Institute on Aging, National Institutes of Health, Bethesda, MD, USA
| | - Rita Guerreiro
- Reta Lila, Weston Research Laboratories, Department of Molecular Neuroscience, UCL Institute of Neurology, London, UK
| | - John Hardy
- Reta Lila, Weston Research Laboratories, Department of Molecular Neuroscience, UCL Institute of Neurology, London, UK.
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22
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Naglah AM, Shinwari Z, Bhat MA, Al-Tahhan M, Al-Omar MA, Al-Dhfyan A. Targeting leukemic side population cells by isatin derivatives of nicotinic acid amide. J BIOL REG HOMEOS AG 2016; 30:353-363. [PMID: 27358121] [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] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
Side population (SP) cells mediate chemoresistance in leukemia. However, chemical inhibition approach to target SP cells has been poorly studied. Herein, we report the discovery of isatin derivatives of nicotinic acid amide as potent side population cell inhibitors. The selected derivatives showed superior potency over the reference drug verapamil. Furthermore, the treatment increased chemosensitivity and inhibited the cell proliferation on three different leukemic cell lines, K562, THP-1 and U937, suggesting that both SP and the bulk of leukemic cells are affected. Moreover, treatment with the most potent compound Nic9 reduced the expression of ABCG2, demonstrating that side population inhibition effect of the target derivatives is at least via ABCG2 inhibition. Importantly, the target derivatives induced erythrocyte/dendritic differentiation to leukemic cells mainly through Musashi/Numb pathway modulation.
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Affiliation(s)
- A M Naglah
- Department of Pharmaceutical Chemistry, College of Pharmacy, King Saud University, Riyadh, Saudi Arabia; Peptide Chemistry Department, Chemical Industries Research Division, National Research Centre, Dokki, Cairo, Egypt
| | - Z Shinwari
- Stem Cell and Tissue Re-Engineering Program, Research Center, King Faisal Specialized Hospital and Research Center, Saudi Arabia
| | - M A Bhat
- Department of Pharmaceutical Chemistry, College of Pharmacy, King Saud University, Riyadh, Saudi Arabia
| | - M Al-Tahhan
- Stem Cell and Tissue Re-Engineering Program, Research Center, King Faisal Specialized Hospital and Research Center, Saudi Arabia
| | - M A Al-Omar
- Department of Pharmaceutical Chemistry, College of Pharmacy, King Saud University, Riyadh, Saudi Arabia
| | - A Al-Dhfyan
- Stem Cell and Tissue Re-Engineering Program, Research Center, King Faisal Specialized Hospital and Research Center, Saudi Arabia; Department of Pharmacology and Toxicology, College of Pharmacy, King Saud University, Riyadh, Saudi Arabia
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23
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Huang HC, Mallidi S, Liu J, Chiang CT, Mai Z, Goldschmidt R, Ebrahim-Zadeh N, Rizvi I, Hasan T. Photodynamic Therapy Synergizes with Irinotecan to Overcome Compensatory Mechanisms and Improve Treatment Outcomes in Pancreatic Cancer. Cancer Res 2016. [PMID: 26719532 DOI: 10.1158/0008-5472.can-] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/17/2023]
Abstract
The ability of tumor cells to adapt to therapeutic regimens by activating alternative survival and growth pathways remains a major challenge in cancer therapy. Therefore, the most effective treatments will involve interactive strategies that target multiple nonoverlapping pathways while eliciting synergistic outcomes and minimizing systemic toxicities. Nanoliposomal irinotecan is approved by the FDA for gemcitabine-refractory metastatic pancreatic cancer. However, the full potential of irinotecan treatment is hindered by several cancer cell survival mechanisms, including ATP-binding cassette G2 (ABCG2) transporter-mediated irinotecan efflux from cells. Here, we demonstrate that benzoporphyrin derivative-based photodynamic therapy (PDT), a photochemical cytotoxic modality that activates the apoptotic pathway, reduced ABCG2 expression to increase intracellular irinotecan levels in pancreatic cancer. Moreover, we show that PDT inhibited survivin expression. Although PDT potentiated irinotecan treatment, we also demonstrate that irinotecan reduced the tumoral expression of monocarboxylate transporter 4, which was upregulated by PDT. Notably, using orthotopic xenograft models, we demonstrate that combination of single low-dose PDT and a subclinical dose of nanoliposomal irinotecan synergistically inhibited tumor growth by 70% for 3 weeks compared with 25% reduction after either monotherapies. Our findings offer new opportunities for the clinical translation of PDT and irinotecan combination therapy for effective pancreatic cancer treatment.
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Affiliation(s)
- Huang-Chiao Huang
- Wellman Center for Photomedicine, Massachusetts General Hospital (MGH) and Harvard Medical School, Boston, Massachusetts. Department of Dermatology, MGH, Boston, Massachusetts
| | - Srivalleesha Mallidi
- Wellman Center for Photomedicine, Massachusetts General Hospital (MGH) and Harvard Medical School, Boston, Massachusetts. Department of Dermatology, MGH, Boston, Massachusetts
| | - Joyce Liu
- Wellman Center for Photomedicine, Massachusetts General Hospital (MGH) and Harvard Medical School, Boston, Massachusetts. Department of Dermatology, MGH, Boston, Massachusetts
| | - Chun-Te Chiang
- Wellman Center for Photomedicine, Massachusetts General Hospital (MGH) and Harvard Medical School, Boston, Massachusetts. Department of Dermatology, MGH, Boston, Massachusetts
| | - Zhiming Mai
- Wellman Center for Photomedicine, Massachusetts General Hospital (MGH) and Harvard Medical School, Boston, Massachusetts. Department of Dermatology, MGH, Boston, Massachusetts
| | - Ruth Goldschmidt
- Wellman Center for Photomedicine, Massachusetts General Hospital (MGH) and Harvard Medical School, Boston, Massachusetts. Department of Dermatology, MGH, Boston, Massachusetts
| | - Neema Ebrahim-Zadeh
- Wellman Center for Photomedicine, Massachusetts General Hospital (MGH) and Harvard Medical School, Boston, Massachusetts. Department of Dermatology, MGH, Boston, Massachusetts
| | - Imran Rizvi
- Wellman Center for Photomedicine, Massachusetts General Hospital (MGH) and Harvard Medical School, Boston, Massachusetts. Department of Dermatology, MGH, Boston, Massachusetts
| | - Tayyaba Hasan
- Wellman Center for Photomedicine, Massachusetts General Hospital (MGH) and Harvard Medical School, Boston, Massachusetts. Department of Dermatology, MGH, Boston, Massachusetts. Division of Health Sciences and Technology, Harvard University and Massachusetts Institute of Technology, Cambridge, Massachusetts.
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24
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Okamoto K, Ueda H, Shimada T, Tamura K, Koumoto Y, Tasaka M, Morita MT, Hara-Nishimura I. An ABC transporter B family protein, ABCB19, is required for cytoplasmic streaming and gravitropism of the inflorescence stems. Plant Signal Behav 2016; 11:e1010947. [PMID: 26337543 PMCID: PMC4883830 DOI: 10.1080/15592324.2015.1010947] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/10/2023]
Abstract
A significant feature of plant cells is the extensive motility of organelles and the cytosol, which was originally defined as cytoplasmic streaming. We suggested previously that a three-way interaction between plant-specific motor proteins myosin XIs, actin filaments, and the endoplasmic reticulum (ER) was responsible for cytoplasmic streaming. (1) Currently, however, there are no reports of molecular components for cytoplasmic streaming other than the actin-myosin-cytoskeleton and ER-related proteins. In the present study, we found that elongated cells of inflorescence stems of Arabidopsis thaliana exhibit vigorous cytoplasmic streaming. Statistical analysis showed that the maximal velocity of plastid movements is 7.26 µm/s, which is much faster than the previously reported velocities of organelles. Surprisingly, the maximal velocity of streaming in the inflorescence stem cells was significantly reduced to 1.11 µm/s in an Arabidopsis mutant, abcb19-101, which lacks ATP BINDING CASSETTE SUBFAMILY B19 (ABCB19) that mediates the polar transport of the phytohormone auxin together with PIN-FORMED (PIN) proteins. Polar auxin transport establishes the auxin concentration gradient essential for plant development and tropisms. Deficiency of ABCB19 activity eventually caused enhanced gravitropic responses of the inflorescence stems and abnormally flexed inflorescence stems. These results suggest that ABCB19-mediated auxin transport plays a role not only in tropism regulation, but also in cytoplasmic streaming.
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Affiliation(s)
- Keishi Okamoto
- Graduate School of Science, Kyoto University, Kyoto 606-8502, Japan
- These authors contributed equally to this work.
| | - Haruko Ueda
- Graduate School of Science, Kyoto University, Kyoto 606-8502, Japan
- These authors contributed equally to this work.
| | - Tomoo Shimada
- Graduate School of Science, Kyoto University, Kyoto 606-8502, Japan
| | - Kentaro Tamura
- Graduate School of Science, Kyoto University, Kyoto 606-8502, Japan
| | - Yasuko Koumoto
- Graduate School of Science, Kyoto University, Kyoto 606-8502, Japan
| | - Masao Tasaka
- Graduate School of Biological Sciences, Nara Institute of Science and Technology, Ikoma 630-0101, Japan
| | - Miyo Terao Morita
- Graduate School of Biological Sciences, Nara Institute of Science and Technology, Ikoma 630-0101, Japan
- Current address: Graduate School of Bioagricultural Sciences, Nagoya University, Nagoya 464-8601, Japan
| | - Ikuko Hara-Nishimura
- Graduate School of Science, Kyoto University, Kyoto 606-8502, Japan
- Correspondence to: Ikuko Hara-Nishimura;
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25
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Huang HC, Mallidi S, Liu J, Chiang CT, Mai Z, Goldschmidt R, Ebrahim-Zadeh N, Rizvi I, Hasan T. Photodynamic Therapy Synergizes with Irinotecan to Overcome Compensatory Mechanisms and Improve Treatment Outcomes in Pancreatic Cancer. Cancer Res 2015; 76:1066-77. [PMID: 26719532 DOI: 10.1158/0008-5472.can-15-0391] [Citation(s) in RCA: 89] [Impact Index Per Article: 9.9] [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] [Received: 02/07/2015] [Accepted: 12/10/2015] [Indexed: 12/18/2022]
Abstract
The ability of tumor cells to adapt to therapeutic regimens by activating alternative survival and growth pathways remains a major challenge in cancer therapy. Therefore, the most effective treatments will involve interactive strategies that target multiple nonoverlapping pathways while eliciting synergistic outcomes and minimizing systemic toxicities. Nanoliposomal irinotecan is approved by the FDA for gemcitabine-refractory metastatic pancreatic cancer. However, the full potential of irinotecan treatment is hindered by several cancer cell survival mechanisms, including ATP-binding cassette G2 (ABCG2) transporter-mediated irinotecan efflux from cells. Here, we demonstrate that benzoporphyrin derivative-based photodynamic therapy (PDT), a photochemical cytotoxic modality that activates the apoptotic pathway, reduced ABCG2 expression to increase intracellular irinotecan levels in pancreatic cancer. Moreover, we show that PDT inhibited survivin expression. Although PDT potentiated irinotecan treatment, we also demonstrate that irinotecan reduced the tumoral expression of monocarboxylate transporter 4, which was upregulated by PDT. Notably, using orthotopic xenograft models, we demonstrate that combination of single low-dose PDT and a subclinical dose of nanoliposomal irinotecan synergistically inhibited tumor growth by 70% for 3 weeks compared with 25% reduction after either monotherapies. Our findings offer new opportunities for the clinical translation of PDT and irinotecan combination therapy for effective pancreatic cancer treatment.
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Affiliation(s)
- Huang-Chiao Huang
- Wellman Center for Photomedicine, Massachusetts General Hospital (MGH) and Harvard Medical School, Boston, Massachusetts. Department of Dermatology, MGH, Boston, Massachusetts
| | - Srivalleesha Mallidi
- Wellman Center for Photomedicine, Massachusetts General Hospital (MGH) and Harvard Medical School, Boston, Massachusetts. Department of Dermatology, MGH, Boston, Massachusetts
| | - Joyce Liu
- Wellman Center for Photomedicine, Massachusetts General Hospital (MGH) and Harvard Medical School, Boston, Massachusetts. Department of Dermatology, MGH, Boston, Massachusetts
| | - Chun-Te Chiang
- Wellman Center for Photomedicine, Massachusetts General Hospital (MGH) and Harvard Medical School, Boston, Massachusetts. Department of Dermatology, MGH, Boston, Massachusetts
| | - Zhiming Mai
- Wellman Center for Photomedicine, Massachusetts General Hospital (MGH) and Harvard Medical School, Boston, Massachusetts. Department of Dermatology, MGH, Boston, Massachusetts
| | - Ruth Goldschmidt
- Wellman Center for Photomedicine, Massachusetts General Hospital (MGH) and Harvard Medical School, Boston, Massachusetts. Department of Dermatology, MGH, Boston, Massachusetts
| | - Neema Ebrahim-Zadeh
- Wellman Center for Photomedicine, Massachusetts General Hospital (MGH) and Harvard Medical School, Boston, Massachusetts. Department of Dermatology, MGH, Boston, Massachusetts
| | - Imran Rizvi
- Wellman Center for Photomedicine, Massachusetts General Hospital (MGH) and Harvard Medical School, Boston, Massachusetts. Department of Dermatology, MGH, Boston, Massachusetts
| | - Tayyaba Hasan
- Wellman Center for Photomedicine, Massachusetts General Hospital (MGH) and Harvard Medical School, Boston, Massachusetts. Department of Dermatology, MGH, Boston, Massachusetts. Division of Health Sciences and Technology, Harvard University and Massachusetts Institute of Technology, Cambridge, Massachusetts.
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26
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Qosa H, Miller DS, Pasinelli P, Trotti D. Regulation of ABC efflux transporters at blood-brain barrier in health and neurological disorders. Brain Res 2015; 1628:298-316. [PMID: 26187753 PMCID: PMC4681613 DOI: 10.1016/j.brainres.2015.07.005] [Citation(s) in RCA: 156] [Impact Index Per Article: 17.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/13/2015] [Revised: 06/28/2015] [Accepted: 07/02/2015] [Indexed: 01/16/2023]
Abstract
The strength of the blood-brain barrier (BBB) in providing protection to the central nervous system from exposure to circulating chemicals is maintained by tight junctions between endothelial cells and by a broad range of transporter proteins that regulate exchange between CNS and blood. The most important transporters that restrict the permeability of large number of toxins as well as therapeutic agents are the ABC transporters. Among them, P-gp, BCRP, MRP1 and MRP2 are the utmost studied. These efflux transporters are neuroprotective, limiting the brain entry of neurotoxins; however, they could also restrict the entry of many therapeutics and contribute to CNS pharmacoresistance. Characterization of several regulatory pathways that govern expression and activity of ABC efflux transporters in the endothelium of brain capillaries have led to an emerging consensus that these processes are complex and contain several cellular and molecular elements. Alterations in ABC efflux transporters expression and/or activity occur in several neurological diseases. Here, we review the signaling pathways that regulate expression and transport activity of P-gp, BCRP, MRP1 and MRP2 as well as how their expression/activity changes in neurological diseases. This article is part of a Special Issue entitled SI: Neuroprotection.
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Affiliation(s)
- Hisham Qosa
- Weinberg Unit for ALS Research, Farber Institute for Neuroscience, Department of Neuroscience, Thomas Jefferson University, 900 Walnut street, Philadelphia, PA 19107, USA.
| | - David S Miller
- Laboratory of Signal Transduction, NIH/NIEHS, Research Triangle Park, NC 27709, USA
| | - Piera Pasinelli
- Weinberg Unit for ALS Research, Farber Institute for Neuroscience, Department of Neuroscience, Thomas Jefferson University, 900 Walnut street, Philadelphia, PA 19107, USA
| | - Davide Trotti
- Weinberg Unit for ALS Research, Farber Institute for Neuroscience, Department of Neuroscience, Thomas Jefferson University, 900 Walnut street, Philadelphia, PA 19107, USA.
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27
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Wen JH, Wei XH, Sheng XY, Zhou DQ, Peng HW, Lu YN, Zhou J. Effect of Ursolic Acid on Breast Cancer Resistance Protein-mediated Transport of Rosuvastatin In Vivo and Vitro. Chin Med Sci J 2015; 30:218-25. [PMID: 26960302 DOI: 10.1016/s1001-9294(16)30004-9] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
Abstract
OBJECTIVE To evaluate whether ursolic acid can inhibit breast cancer resistance protein (BCRP)-mediated transport of rosuvastatin in vivo and in vitro. METHODS Firstly, we explored the pharmacokinetics of 5-fluorouracil (5-FU, a substrate of BCRP) in rats in the presence or absence of ursolic acid. Secondly, we studied the pharmacokinetics of rosuvastatin in rats in the presence or absence of ursolic acid or Ko143 (inhibitor of BCRP). Finially, the concentration-dependent transport of rosuvastatin and the inhibitory effects of ursolic acid and Ko143 were examined in Madin-Darby Canine Kidney (MDCK) 2-BCRP421CC (wild type) cells and MDCK2-BCRP421AA (mutant type) cells. RESULTS As a result, significant changes in pharmacokinetics parameters of 5-FU were observed in rats following pretreatment with ursolic acid. Both ursolic acid and Ko143 could significantly affect the pharmacokinetics of rosuvastatin. The rosuvastatin transport in the BCRP overexpressing system was increased in a concentration-dependent manner. However, there was no statistical difference in BCRP-mediated transport of rosuvastatin betweent the wild type cells and mutant cells. The same as Ko143, ursolic acid inhibited BCRP-mediated transport of rosuvastatin in vitro. CONCLUSION Ursolic acid appears to be a potent modulator of BCRP that affects the pharmacokinetic of rosuvastatin in vivo and inhibits the transport of rosuvastatin in vitro.
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Affiliation(s)
- Jin-hua Wen
- Department of Pharmacy, the First Affiliated Hospital of Nanchang University, Nanchang 330006, China
| | - Xiao-hua Wei
- Department of Pharmacy, the First Affiliated Hospital of Nanchang University, Nanchang 330006, China
| | - Xiang-yuan Sheng
- Department of Pharmacy, the First Affiliated Hospital of Nanchang University, Nanchang 330006, China
| | - De-qing Zhou
- Department of Pharmacy, the First Affiliated Hospital of Nanchang University, Nanchang 330006, China
| | - Hong-wei Peng
- Department of Pharmacy, the First Affiliated Hospital of Nanchang University, Nanchang 330006, China
| | - Yan-ni Lu
- Department of Pharmacy, the First Affiliated Hospital of Nanchang University, Nanchang 330006, China
| | - Jian Zhou
- Department of Pharmacy, the First Affiliated Hospital of Nanchang University, Nanchang 330006, China
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Wang Y, Su K, Sabeva NS, Ji A, van der Westhuyzen DR, Foufelle F, Gao X, Graf GA. GRP78 rescues the ABCG5 ABCG8 sterol transporter in db/db mice. Metabolism 2015; 64:1435-43. [PMID: 26365598 PMCID: PMC4609626 DOI: 10.1016/j.metabol.2015.08.005] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [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: 04/08/2015] [Revised: 07/31/2015] [Accepted: 08/10/2015] [Indexed: 12/14/2022]
Abstract
OBJECTIVE Mice lacking leptin (ob/ob) or its receptor (db/db) are obese, insulin resistant, and have reduced levels of biliary cholesterol due, in part, to reduced levels of hepatic G5G8. Chronic leptin replacement restores G5G8 abundance and increases biliary cholesterol concentrations, but the molecular mechanisms responsible for G5G8 regulation remain unclear. In the current study, we used a series of mouse models to address potential mechanisms for leptin-mediated regulation of G5G8. METHODS AND RESULTS We acutely replaced leptin in ob/ob mice and deleted hepatic leptin receptors in lean mice. Neither manipulation altered G5G8 abundance or biliary cholesterol. Similarly, hepatic vagotomy had no effect on G5G8. Alternatively, G5G8 may be decreased in ob/ob and db/db mice due to ER dysfunction, the site of G5G8 complex assembly. Overexpression of the ER chaperone GRP78 using an adenoviral vector restores ER function and reduces steatosis in ob/ob mice. Therefore, we determined if AdGRP78 could rescue G5G8 in db/db mice. As in ob/ob mice, AdGRP78 reduced expression of lipogenic genes and plasma triglycerides in the db/db strain. Both G5 and G8 protein levels increased as did total biliary cholesterol, but in the absence of changes in G5 or G8 mRNAs. The increase in G5G8 was associated with increases in a number of proteins, including the ER lectin chaperone, calnexin, a key regulator of G5G8 complex assembly. CONCLUSIONS Leptin signaling does not directly regulate G5G8 abundance. The loss of G5G8 in mice harboring defects in the leptin axis is likely associated with compromised ER function.
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Affiliation(s)
- Yuhuan Wang
- Department of Pharmaceutical Sciences, University of Kentucky, Lexington, KY, USA
| | - Kai Su
- Department of Pharmaceutical Sciences, University of Kentucky, Lexington, KY, USA
| | - Nadezhda S Sabeva
- Department of Neuroscience, Universidad Central del Caribe, Bayamón, PR, USA
| | - Ailing Ji
- Department of Internal Medicine and Molecular, University of Kentucky, Lexington, KY, USA; Department of Cellular Biochemistry, University of Kentucky, Lexington, KY, USA
| | - Deneys R van der Westhuyzen
- Graduate Center for Nutritional Sciences, Saha Cardiovascular Research Center and Barnstable Brown Kentucky Diabetes and Obesity Center, Lexington, KY, USA; Department of Internal Medicine and Molecular, University of Kentucky, Lexington, KY, USA; Department of Cellular Biochemistry, University of Kentucky, Lexington, KY, USA
| | - Fabienne Foufelle
- INSERM, UMR-S 872, Centre de Recherches des Cordeliers, 15 rue de L'école de Médecine, Paris, France
| | - Xia Gao
- Department of Biochemistry, University of Alberta, Edmonton, AB, Canada
| | - Gregory A Graf
- Department of Pharmaceutical Sciences, University of Kentucky, Lexington, KY, USA; Graduate Center for Nutritional Sciences, Saha Cardiovascular Research Center and Barnstable Brown Kentucky Diabetes and Obesity Center, Lexington, KY, USA.
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Abstract
ABC transporters form the largest of all transporter families, and their structural study has made tremendous progress over recent years. However, despite such advances, the precise mechanisms that determine the energy-coupling between ATP hydrolysis and the conformational changes following substrate binding remain to be elucidated. Here, we present our thermodynamic analysis for both ABC importers and exporters, and introduce the two new concepts of differential-binding energy and elastic conformational energy into the discussion. We hope that the structural analysis of ABC transporters will henceforth take thermodynamic aspects of transport mechanisms into account as well.
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Affiliation(s)
- Xuejun C Zhang
- National Laboratory of Macromolecules, National Center of Protein Science-Beijing, Institute of Biophysics, Chinese Academy of Sciences, Beijing, 100101, China.
| | - Lei Han
- National Laboratory of Macromolecules, National Center of Protein Science-Beijing, Institute of Biophysics, Chinese Academy of Sciences, Beijing, 100101, China
| | - Yan Zhao
- National Laboratory of Macromolecules, National Center of Protein Science-Beijing, Institute of Biophysics, Chinese Academy of Sciences, Beijing, 100101, China
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Marton J, Albert D, Wiltshire SA, Park R, Bergen A, Qureshi S, Malo D, Burelle Y, Vidal SM. Cyclosporine A Treatment Inhibits Abcc6-Dependent Cardiac Necrosis and Calcification following Coxsackievirus B3 Infection in Mice. PLoS One 2015; 10:e0138222. [PMID: 26375467 PMCID: PMC4574283 DOI: 10.1371/journal.pone.0138222] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/23/2015] [Accepted: 08/26/2015] [Indexed: 11/18/2022] Open
Abstract
Coxsackievirus type B3 (CVB3) is a cardiotropic enterovirus. Infection causes cardiomyocyte necrosis and myocardial inflammation. The damaged tissue that results is replaced with fibrotic or calcified tissue, which can lead to permanently altered cardiac function. The extent of pathogenesis among individuals exposed to CVB3 is dictated by a combination of host genetics, viral virulence, and the environment. Here, we aimed to identify genes that modulate cardiopathology following CVB3 infection. 129S1 mice infected with CVB3 developed increased cardiac pathology compared to 129X1 substrain mice despite no difference in viral burden. Linkage analysis identified a major locus on chromosome 7 (LOD: 8.307, P<0.0001) that controlled the severity of cardiac calcification and necrosis following infection. Sub-phenotyping and genetic complementation assays identified Abcc6 as the underlying gene. Microarray expression profiling identified genotype-dependent regulation of genes associated with mitochondria. Electron microscopy examination showed elevated deposition of hydroxyapatite-like material in the mitochondrial matrices of infected Abcc6 knockout (Abcc6-/-) mice but not in wildtype littermates. Cyclosporine A (CsA) inhibits mitochondrial permeability transition pore opening by inhibiting cyclophilin D (CypD). Treatment of Abcc6 -/- mice with CsA reduced cardiac necrosis and calcification by more than half. Furthermore, CsA had no effect on the CVB3-induced phenotype of doubly deficient CypD-/-Abcc6-/- mice. Altogether, our work demonstrates that mutations in Abcc6 render mice more susceptible to cardiac calcification following CVB3 infection. Moreover, we implicate CypD in the control of cardiac necrosis and calcification in Abcc6-deficient mice, whereby CypD inhibition is required for cardioprotection.
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Affiliation(s)
- Jennifer Marton
- Department of Human Genetics and Complex Traits Group, McGill University, Montreal, Canada
| | - Danica Albert
- Department of Human Genetics and Complex Traits Group, McGill University, Montreal, Canada
| | - Sean A. Wiltshire
- Department of Human Genetics and Complex Traits Group, McGill University, Montreal, Canada
| | - Robin Park
- Department of Human Genetics and Complex Traits Group, McGill University, Montreal, Canada
| | - Arthur Bergen
- Department of Ophthalmogenetics, The Netherlands Institute for Neuroscience, Amsterdam, The Netherlands
| | - Salman Qureshi
- The Center for Host Resistance and the Division of Experimental Medicine, McGill University, Montreal, Canada
| | - Danielle Malo
- Department of Human Genetics and Complex Traits Group, McGill University, Montreal, Canada
| | - Yan Burelle
- Faculty of Pharmacy, University of Montreal, Montreal, Canada
| | - Silvia M. Vidal
- Department of Human Genetics and Complex Traits Group, McGill University, Montreal, Canada
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Sakai-Kato K, Nanjo K, Kusuhara H, Nishiyama N, Kataoka K, Kawanishi T, Okuda H, Goda Y. Effect of Knockout of Mdr1a and Mdr1b ABCB1 Genes on the Systemic Exposure of a Doxorubicin-Conjugated Block Copolymer in Mice. Mol Pharm 2015; 12:3175-83. [PMID: 26194248 DOI: 10.1021/acs.molpharmaceut.5b00234] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [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: 11/30/2022]
Abstract
We previously elucidated that ATP-binding cassette subfamily B member 1 (ABCB1) mediates the efflux of doxorubicin-conjugated block copolymers from HeLa cells. Here, we investigated the role of ABCB1 in the in vivo behavior of a doxorubicin-conjugated polymer in Mdr1a/1b(-/-) mice. The area under the curve for intravenously administered polymer in Mdr1a/1b(-/-) mice was 2.2-fold greater than that in wild-type mice. The polymer was mostly distributed in the liver followed by spleen and less so in the brain, heart, kidney, and lung. The amount of polymer excreted in the urine was significantly decreased in Mdr1a/1b(-/-) mice. The amounts of polymers excreted in the feces were similar in both groups despite the higher systemic exposure in Mdr1a/1b(-/-) mice. Confocal microscopy images showed polymer localized in CD68(+) macrophages in the liver. These results show that knockout of ABCB1 prolonged systemic exposure of the doxorubicin-conjugated polymer in mice. Our results suggest that ABCB1 mediated the excretion of doxorubicin-conjugated polymer in urine and feces. Our results provide valuable information about the behavior of block copolymers in vivo, which is important for evaluating the pharmacokinetics of active substances conjugated to block copolymers or the accumulation of block copolymers in vivo.
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Affiliation(s)
- Kumiko Sakai-Kato
- Division of Drugs, National Institute of Health Sciences , 1-18-1 Kamiyoga, Setagaya, Tokyo 158-8501, Japan
| | - Kunie Nanjo
- Division of Drugs, National Institute of Health Sciences , 1-18-1 Kamiyoga, Setagaya, Tokyo 158-8501, Japan
| | | | - Nobuhiro Nishiyama
- Polymer Chemistry Division, Chemical Resources Laboratory, Tokyo Institute of Technology , R1-11, 4259 Nagatsuda, Midori, Yokohama 226-8503, Japan
| | - Kazunori Kataoka
- Department of Materials Engineering, Graduate School of Engineering, The University of Tokyo , 7-3-1 Hongo, Bunkyo, Tokyo 113-8656, Japan
| | - Toru Kawanishi
- National Institute of Health Sciences , 1-18-1 Kamiyoga, Setagaya, Tokyo 158-8501, Japan
| | - Haruhiro Okuda
- National Institute of Health Sciences , 1-18-1 Kamiyoga, Setagaya, Tokyo 158-8501, Japan
| | - Yukihiro Goda
- Division of Drugs, National Institute of Health Sciences , 1-18-1 Kamiyoga, Setagaya, Tokyo 158-8501, Japan
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Yang J, Song Q, Cai Y, Wang P, Wang M, Zhang D. RLIP76-dependent suppression of PI3K/AKT/Bcl-2 pathway by miR-101 induces apoptosis in prostate cancer. Biochem Biophys Res Commun 2015; 463:900-6. [PMID: 26067553 DOI: 10.1016/j.bbrc.2015.06.032] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/13/2015] [Accepted: 06/05/2015] [Indexed: 12/20/2022]
Abstract
MicroRNA-101 (miR-101) participates in carcinogenesis and tumor progression in various cancers. However, its biological functions in prostate cancer are still unclear. Here, we demonstrate that miR-101 represents a critical role in regulating cell apoptosis in prostate cancer cells. We first demonstrated that miR-101 treatment promoted apoptosis in DU145 and PC3 cells by using flow cytometric analysis and transmission electron microscopy (TEM). To verify the mechanisms, we identified a novel miR-101 target, Ral binding protein 1 (RLIP76). We found miR-101 transfection significantly suppresses RLIP76 expression, which can transactivate phosphorylation of PI3K-Akt signaling, and resulted in an amplification of Bcl2-induced apoptosis. Furthermore, we demonstrated that RLIP76 overexpression could reverse the anti-tumor effects of miR-101 in DU145 and PC3 cells by using flow cytometry assay and MTT assay. Taken together, our results revealed that the effect of miR-101 on prostate cancer cell apoptosis was due to RLIP76 regulation of the PI3K/Akt/Bcl-2 signaling pathway.
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Affiliation(s)
- Jing Yang
- Chinese PLA General Hospital, Department of Oncology, 28 Fuxing Road, Beijing, 100853, China
| | - Qi Song
- Chinese PLA General Hospital, Department of Oncology, 28 Fuxing Road, Beijing, 100853, China
| | - Yi Cai
- Chinese PLA General Hospital, Department of Oncology, 28 Fuxing Road, Beijing, 100853, China
| | - Peng Wang
- Chinese PLA General Hospital, Department of Oncology, 28 Fuxing Road, Beijing, 100853, China
| | - Min Wang
- Chinese PLA General Hospital, Department of Oncology, 28 Fuxing Road, Beijing, 100853, China
| | - Dong Zhang
- Chinese PLA General Hospital, Department of Oncology, 28 Fuxing Road, Beijing, 100853, China.
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Walter S, Kahla A, Arunachalam C, Perochon A, Khan MR, Scofield SR, Doohan FM. A wheat ABC transporter contributes to both grain formation and mycotoxin tolerance. J Exp Bot 2015; 66:2583-93. [PMID: 25732534 PMCID: PMC4986867 DOI: 10.1093/jxb/erv048] [Citation(s) in RCA: 61] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/18/2023]
Abstract
The mycotoxin deoxynivalenol (DON) acts as a disease virulence factor for Fusarium fungi, and tolerance of DON enhances wheat resistance to Fusarium head blight (FHB) disease. Two variants of an ATP-binding cassette (ABC) family C transporter gene were cloned from DON-treated wheat mRNA, namely TaABCC3.1 and TaABCC3.2. These represent two of three putative genes identified on chromosomes 3A, 3B, and 3D of the wheat genome sequence. Variant TaABCC3.1 represents the DON-responsive transcript previously associated with DON resistance in wheat. PCR-based mapping and in silico sequence analyses located TaABCC3.1 to the short arm of wheat chromosome 3B (not within the FHB resistance quantitative trait locus Fhb1). In silico analyses of microarray data indicated that TaABCC3 genes are expressed in reproductive tissue and roots, and in response to the DON producer Fusarium graminearum. Gene expression studies showed that TaABCC3.1 is activated as part of the early host response to DON and in response to the FHB defence hormone jasmonic acid. Virus-induced gene silencing (VIGS) confirmed that TaABCC3 genes contributed to DON tolerance. VIGS was performed using two independent viral construct applications: one specifically targeted TaABCC3.1 for silencing, while the other targeted this gene and the chromosome 3A homeologue. In both instances, VIGS resulted in more toxin-induced discoloration of spikelets, compared with the DON effects in non-silenced spikelets at 14 d after toxin treatment (≥2.2-fold increase, P<0.05). Silencing by both VIGS constructs enhanced head ripening, and especially so in DON-treated heads. VIGS of TaABCC3 genes also reduced the grain number by more than 28% (P<0.05), both with and without DON treatment, and the effects were greater for the construct that targeted the two homeologues. Hence, DON-responsive TaABCC3 genes warrant further study to determine their potential as disease resistance breeding targets and their function in grain formation and ripening.
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Affiliation(s)
- Stephanie Walter
- UCD Earth Institute and School of Biology & Environment Science, University College Dublin, Science Centre West, Belfield, Dublin 4, Ireland
| | - Amal Kahla
- UCD Earth Institute and School of Biology & Environment Science, University College Dublin, Science Centre West, Belfield, Dublin 4, Ireland
| | - Chanemoughasoundharam Arunachalam
- UCD Earth Institute and School of Biology & Environment Science, University College Dublin, Science Centre West, Belfield, Dublin 4, Ireland
| | - Alexandre Perochon
- UCD Earth Institute and School of Biology & Environment Science, University College Dublin, Science Centre West, Belfield, Dublin 4, Ireland
| | - Mojibur R Khan
- UCD Earth Institute and School of Biology & Environment Science, University College Dublin, Science Centre West, Belfield, Dublin 4, Ireland
| | - Steven R Scofield
- USDA-ARS, Crop Production and Pest Control Research Unit and Purdue University, Department of Agronomy, 915 West Street, West Lafayette, IN 47907-2054, USA
| | - Fiona M Doohan
- UCD Earth Institute and School of Biology & Environment Science, University College Dublin, Science Centre West, Belfield, Dublin 4, Ireland
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Haixia P, Yifeng B, Honglin H. [Role and clinical significance of RLIP76 in regulation of multi-drug resistance of small cell lung cancer]. Zhonghua Zhong Liu Za Zhi 2015; 37:266-271. [PMID: 26462890] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
OBJECTIVE To investigate the role of RLIP76 in regulating multi-drug resistance in small cell lung cancer (SCLC), and to analyze the relationship between its expression and prognosis. METHODS The expressions of RLIP76 protein and gene were detected by Western blotting and real-time PCR (RT-PCR) in both the chemosensitive SCLC H69 cell line and chemoresistant H69AR cell line, respectively. siRNA was transfected into the H69AR cells to inhibit RLIP76 expression, and eGFP-RLIP76 was transfected into the H69 cells to enhance RLIP76 expression. The drug-sensitivity of cells to chemotherapeutic drugs (ADM, DDP, VP-16) were detected by CCK8 assay. The expression of RLIP76 in the SCLC tissues was detected by immunohistochemistry. The relationship of RLIP76 expression with clinicopathological features and prognosis of the patients was analyzed. RESULTS The expression of RLIP76 in H69AR cells was 13.675 ± 0.983, significantly higher than 1.074 ± 0.107 in the H69 cells (P < 0.01). The drug-sensitivities of H69AR cells to chemotherapeutic drugs were significantly increased when the expression of RLIP76 was down-regulated (P< 0.001). The sensitivities of H69 cells to chemotherapeutic drugs ADM, DDP and VP-16 were significantly decreased after transfection with eGFP-RLIP76 up-regulating the RLIP76 expression (P = 0.003). The positive expression rates were 61.3% and 9.4% in the SCLC tumor tissues and para-cancerous tissues, respectively (P < 0.01). The expression of RLIP76 was significantly correlated with clinical stage, chemosensitivity and overall survival of the SCLC patients (P < 0.05). CONCLUSIONS Our results suggest that RLIP76 is involved in the regulation of small cell lung cancer multidrug resistance. RLIP76 may serve as a potential target gene to evaluate the chemosensitivity and clinical prognostic for small cell lung cancer.
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35
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Tóth A, Brózik A, Szakács G, Sarkadi B, Hegedüs T. A novel mathematical model describing adaptive cellular drug metabolism and toxicity in the chemoimmune system. PLoS One 2015; 10:e0115533. [PMID: 25699998 PMCID: PMC4338831 DOI: 10.1371/journal.pone.0115533] [Citation(s) in RCA: 6] [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] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/21/2014] [Accepted: 11/25/2014] [Indexed: 02/01/2023] Open
Abstract
Cells cope with the threat of xenobiotic stress by activating a complex molecular network that recognizes and eliminates chemically diverse toxic compounds. This "chemoimmune system" consists of cellular Phase I and Phase II metabolic enzymes, Phase 0 and Phase III ATP Binding Cassette (ABC) membrane transporters, and nuclear receptors regulating these components. In order to provide a systems biology characterization of the chemoimmune network, we designed a reaction kinetic model based on differential equations describing Phase 0-III participants and regulatory elements, and characterized cellular fitness to evaluate toxicity. In spite of the simplifications, the model recapitulates changes associated with acquired drug resistance and allows toxicity predictions under variable protein expression and xenobiotic exposure conditions. Our simulations suggest that multidrug ABC transporters at Phase 0 significantly facilitate the defense function of successive network members by lowering intracellular drug concentrations. The model was extended with a novel toxicity framework which opened the possibility of performing in silico cytotoxicity assays. The alterations of the in silico cytotoxicity curves show good agreement with in vitro cell killing experiments. The behavior of the simplified kinetic model suggests that it can serve as a basis for more complex models to efficiently predict xenobiotic and drug metabolism for human medical applications.
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Affiliation(s)
- Attila Tóth
- MTA-SE Molecular Biophysics Research Group, Hungarian Academy of Sciences, Budapest, 1094, Hungary
- Department of Biophysics and Radiation Biology, Semmelweis University, Budapest, 1094, Hungary
- Institute of Enzymology, Research Centre for Natural Sciences, Hungarian Academy of Sciences, Budapest, 1113, Hungary
| | - Anna Brózik
- Institute of Enzymology, Research Centre for Natural Sciences, Hungarian Academy of Sciences, Budapest, 1113, Hungary
| | - Gergely Szakács
- Institute of Enzymology, Research Centre for Natural Sciences, Hungarian Academy of Sciences, Budapest, 1113, Hungary
| | - Balázs Sarkadi
- MTA-SE Molecular Biophysics Research Group, Hungarian Academy of Sciences, Budapest, 1094, Hungary
- Department of Biophysics and Radiation Biology, Semmelweis University, Budapest, 1094, Hungary
- Institute of Enzymology, Research Centre for Natural Sciences, Hungarian Academy of Sciences, Budapest, 1113, Hungary
| | - Tamás Hegedüs
- MTA-SE Molecular Biophysics Research Group, Hungarian Academy of Sciences, Budapest, 1094, Hungary
- Department of Biophysics and Radiation Biology, Semmelweis University, Budapest, 1094, Hungary
- * E-mail:
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Lin J, Eggensperger S, Hank S, Wycisk AI, Wieneke R, Mayerhofer PU, Tampé R. A negative feedback modulator of antigen processing evolved from a frameshift in the cowpox virus genome. PLoS Pathog 2014; 10:e1004554. [PMID: 25503639 PMCID: PMC4263761 DOI: 10.1371/journal.ppat.1004554] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/19/2014] [Accepted: 11/04/2014] [Indexed: 12/31/2022] Open
Abstract
Coevolution of viruses and their hosts represents a dynamic molecular battle between the immune system and viral factors that mediate immune evasion. After the abandonment of smallpox vaccination, cowpox virus infections are an emerging zoonotic health threat, especially for immunocompromised patients. Here we delineate the mechanistic basis of how cowpox viral CPXV012 interferes with MHC class I antigen processing. This type II membrane protein inhibits the coreTAP complex at the step after peptide binding and peptide-induced conformational change, in blocking ATP binding and hydrolysis. Distinct from other immune evasion mechanisms, TAP inhibition is mediated by a short ER-lumenal fragment of CPXV012, which results from a frameshift in the cowpox virus genome. Tethered to the ER membrane, this fragment mimics a high ER-lumenal peptide concentration, thus provoking a trans-inhibition of antigen translocation as supply for MHC I loading. These findings illuminate the evolution of viral immune modulators and the basis of a fine-balanced regulation of antigen processing. Virus-infected or malignant transformed cells are eliminated by cytotoxic T lymphocytes, which recognize antigenic peptide epitopes in complex with major histocompatibility complex class I (MHC I) molecules at the cell surface. The majority of such peptides are derived from proteasomal degradation in the cytosol and are then translocated into the ER lumen in an energy-consuming reaction via the transporter associated with antigen processing (TAP), which delivers the peptides onto MHC I molecules as final acceptors. Viruses have evolved sophisticated strategies to escape this immune surveillance. Here we show that the cowpox viral protein CPXV012 inhibits the ER peptide translocation machinery by allosterically blocking ATP binding and hydrolysis by TAP. The short ER resident active domain of the viral protein evolved from a reading frame shift in the cowpox virus genome and exploits the ER-lumenal negative feedback peptide sensor of TAP. This CPXV012-induced conformational arrest of TAP is signaled by a unique communication across the ER membrane to the cytosolic motor domains of the peptide pump. Furthermore, this study provides the rare opportunity to decipher on a molecular level how nature plays hide and seek with a pathogen and its host.
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Affiliation(s)
- Jiacheng Lin
- Institute of Biochemistry, Biocenter, Goethe-University Frankfurt, Frankfurt, Germany
| | - Sabine Eggensperger
- Institute of Biochemistry, Biocenter, Goethe-University Frankfurt, Frankfurt, Germany
| | - Susanne Hank
- Institute of Biochemistry, Biocenter, Goethe-University Frankfurt, Frankfurt, Germany
| | - Agnes I. Wycisk
- Institute of Biochemistry, Biocenter, Goethe-University Frankfurt, Frankfurt, Germany
| | - Ralph Wieneke
- Institute of Biochemistry, Biocenter, Goethe-University Frankfurt, Frankfurt, Germany
| | - Peter U. Mayerhofer
- Institute of Biochemistry, Biocenter, Goethe-University Frankfurt, Frankfurt, Germany
- * E-mail: (PUM); (RT)
| | - Robert Tampé
- Institute of Biochemistry, Biocenter, Goethe-University Frankfurt, Frankfurt, Germany
- Cluster of Excellence – Macromolecular Complexes, Goethe-University Frankfurt, Frankfurt, Germany
- * E-mail: (PUM); (RT)
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37
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Silva TMA, Mol JPS, Winter MG, Atluri V, Xavier MN, Pires SF, Paixão TA, Andrade HM, Santos RL, Tsolis RM. The predicted ABC transporter AbcEDCBA is required for type IV secretion system expression and lysosomal evasion by Brucella ovis. PLoS One 2014; 9:e114532. [PMID: 25474545 PMCID: PMC4256435 DOI: 10.1371/journal.pone.0114532] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/24/2014] [Accepted: 11/10/2014] [Indexed: 12/23/2022] Open
Abstract
Brucella ovis is a major cause of reproductive failure in rams and it is one of the few well-described Brucella species that is not zoonotic. Previous work showed that a B. ovis mutant lacking a species-specific ABC transporter (ΔabcBA) was attenuated in mice and was unable to survive in macrophages. The aim of this study was to evaluate the role of this ABC transporter during intracellular survival of B. ovis. In HeLa cells, B. ovis WT was able to survive and replicate at later time point (48 hpi), whereas an ΔabcBA mutant was attenuated at 24 hpi. The reduced survival of the ΔabcBA mutant was associated with a decreased ability to exclude the lysosomal marker LAMP1 from its vacuolar membrane, suggesting a failure to establish a replicative niche. The ΔabcBA mutant showed a reduced abundance of the Type IV secretion system (T4SS) proteins VirB8 and VirB11 in both rich and acid media, when compared to WT B. ovis. However, mRNA levels of virB1, virB8, hutC, and vjbR were similar in both strains. These results support the notion that the ABC transporter encoded by abcEDCBA or its transported substrate acts at a post-transcriptional level to promote the optimal expression of the B. ovis T4SS within infected host cells.
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Affiliation(s)
- Teane M. A. Silva
- Departamento de Clínica e Cirurgia Veterinária, Escola de Veterinária da Universidade Federal de Minas Gerais, Belo Horizonte, Minas Gerais, Brazil
| | - Juliana P. S. Mol
- Departamento de Clínica e Cirurgia Veterinária, Escola de Veterinária da Universidade Federal de Minas Gerais, Belo Horizonte, Minas Gerais, Brazil
| | - Maria G. Winter
- Department of Medical Microbiology and Immunology, University of California Davis, Davis, California, United States of America
| | - Vidya Atluri
- Department of Medical Microbiology and Immunology, University of California Davis, Davis, California, United States of America
| | - Mariana N. Xavier
- Department of Medical Microbiology and Immunology, University of California Davis, Davis, California, United States of America
| | - Simone F. Pires
- Departamento de Parasitologia, Instituto de Ciências Biológicas da Universidade Federal de Minas Gerais, Belo Horizonte, Minas Gerais, Brazil
| | - Tatiane A. Paixão
- Departamento de Patologia Geral, Instituto de Ciências Biológicas da Universidade Federal de Minas Gerais, Belo Horizonte, Minas Gerais, Brazil
| | - Hélida M. Andrade
- Departamento de Parasitologia, Instituto de Ciências Biológicas da Universidade Federal de Minas Gerais, Belo Horizonte, Minas Gerais, Brazil
| | - Renato L. Santos
- Departamento de Clínica e Cirurgia Veterinária, Escola de Veterinária da Universidade Federal de Minas Gerais, Belo Horizonte, Minas Gerais, Brazil
- * E-mail: (RLS); (RMT)
| | - Renee M. Tsolis
- Department of Medical Microbiology and Immunology, University of California Davis, Davis, California, United States of America
- * E-mail: (RLS); (RMT)
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Abstract
MRP4 (multidrug resistance-associated protein 4) is a member of the MRP/ABCC subfamily of ATP-binding cassette (ABC) transporters that are essential for many cellular processes requiring the transport of substrates across cell membranes. Although MRP4 has been implicated as a detoxification protein by transport of structurally diverse endogenous and xenobiotic compounds, including antivirus and anticancer drugs, that usually induce oxidative stress in cells, its in vivo biological function remains unknown. In this study, we investigate the biological functions of a Drosophila homolog of human MRP4, dMRP4. We show that dMRP4 expression is elevated in response to oxidative stress (paraquat, hydrogen peroxide and hyperoxia) in Drosophila. Flies lacking dMRP4 have a shortened lifespan under both oxidative and normal conditions. Overexpression of dMRP4, on the other hand, is sufficient to increase oxidative stress resistance and extend lifespan. By genetic manipulations, we demonstrate that dMRP4 is required for JNK (c-Jun NH2-terminal kinase) activation during paraquat challenge and for basal transcription of some JNK target genes under normal condition. We show that impaired JNK signaling is an important cause for major defects associated with dMRP4 mutations, suggesting that dMRP4 regulates lifespan by modulating the expression of a set of genes related to both oxidative resistance and aging, at least in part, through JNK signaling. The drug transporters are often known for their ability to transport different physiological-related compounds across cell membranes. Although the abnormal up-regulation of some these transporters is believed to be the common cause of the clinic problem called drug resistance, the biological functions of these transporters remain largely unknown. Here we show that a Drosophila homolog of the mammalian drug transporter plays a role in lifespan regulation. Mutations of this gene increase the sensitivity to oxidative stress and reduce lifespan, while overexpression of this gene increases resistance to oxidative stress and extends lifespan. By molecular and genetic analyses, we have linked functions of this gene to a key signaling transduction pathway that has been known to be important in lifespan regulation.
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Affiliation(s)
- He Huang
- Department of Pediatrics (Division of Respiratory Medicine), University of California San Diego, La Jolla, California, United States of America
| | - Ying Lu-Bo
- Department of Pediatrics (Division of Respiratory Medicine), University of California San Diego, La Jolla, California, United States of America
| | - Gabriel G. Haddad
- Department of Pediatrics (Division of Respiratory Medicine), University of California San Diego, La Jolla, California, United States of America
- Rady Children's Hospital San Diego, San Diego, California, United States of America
- * E-mail:
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39
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Choo EF, Ly J, Chan J, Shahidi-Latham SK, Messick K, Plise E, Quiason CM, Yang L. Role of P-glycoprotein on the brain penetration and brain pharmacodynamic activity of the MEK inhibitor cobimetinib. Mol Pharm 2014; 11:4199-207. [PMID: 25243894 DOI: 10.1021/mp500435s] [Citation(s) in RCA: 37] [Impact Index Per Article: 3.7] [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: 01/21/2023]
Abstract
Cobimetinib is a MEK inhibitor currently in clinical trials as an anticancer agent. The objectives of this study were to determine in vitro and in vivo if cobimetinib is a substrate of P-glycoprotein (P-gp) and/or breast cancer resistance protein (Bcrp1) and to assess the implications of efflux on cobimetinib pharmacokinetics (PK), brain penetration, and target modulation. Cell lines transfected with P-gp or Bcrp1 established that cobimetinib was a substrate of P-gp but not a substrate of Bcrp1. In vivo, after intravenous and oral administration of cobimetinib to FVB (wild-type; WT), Mdr1a/b(-/-), Bcrp1 (-/-), and Mdr1a/b(-/-)/Bcrp(-/-) knockout (KO) mice, clearance was similar in WT (35.5 ± 16.7 mL/min/kg) and KO animals (22.0 ± 3.6 to 27.6 ± 5.2 mL/min/kg); oral exposure was also similar between WT and KO animals. After an oral 10 mg/kg dose of cobimetinib, the mean total brain to plasma ratio (Kp) at 6 h postdose was 0.3 and 0.2 in WT and Bcrp1(-/-) mice, respectively. In Mdr1a/b(-/-) and Mdr1a/1b/Bcrp1(-/-) KO mice and WT mice treated with elacridar (a P-gp and BCRP inhibitor), Kp increased to 11, 6, and 7, respectively. Increased brain exposure in Mdr1a/b(-/-) and Mdr1a/1b/Bcrp1(-/-) KO and elacridar treated mice was accompanied by up to ∼65% suppression of the target (pErk) in brain tissue, compared to WT mice. By MALDI imaging, the cobimetinib signal intensity was relatively high and was dispersed throughout the brain of Mdr1a/1b/Bcrp1(-/-) KO mice compared to low/undetectable signal intensity in WT mice. The efflux of cobimetinib by P-gp may have implications for the treatment of patients with brain tumors/metastases.
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Affiliation(s)
- Edna F Choo
- Genentech Inc., 1 DNA Way, South San Francisco, California 94080, United States
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40
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Abstract
Androgens play a critical role in the development and progression of prostate cancer (PCa), and androgen deprivation therapy via surgical or medical castration is front-line therapy for patients with advanced PCa. However, intratumoral testosterone levels are elevated in metastases from patients with castration-resistant disease, and residual intratumoral androgens have been implicated in mediating ligand-dependent mechanisms of androgen receptor activation. The source of residual tissue androgens present despite castration has not been fully elucidated, but proposed mechanisms include uptake and conversion of adrenal androgens, such as dehdroepiandrosterone to testosterone and dihydrotestosterone, or de novo androgen synthesis from cholesterol or progesterone precursors. In this minireview, we discuss the emerging evidence that suggests a role for specific transporters in mediating transport of steroids into or out of prostate cells, thereby influencing intratumoral androgen levels and PCa development and progression. We focus on the solute carrier and ATP binding cassette gene families, which have the most published data for a role in PCa-related steroid transport, and review the potential impact of genetic variation on steroid transport activity and PCa outcomes. Continued assessment of transport activity in PCa models and human tumor tissue is needed to better delineate the different roles these transporters play in physiologic and neoplastic settings, and in order to determine whether targeting the uptake of steroid substrates by specific transporters may be a clinically feasible therapeutic strategy.
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Affiliation(s)
- Eunpi Cho
- School of Medicine (E.C., R.B.M.), University of Washington, Seattle, Washington 98195; and Division of Clinical Research (E.A.M.), Fred Hutchinson Cancer Research Center, Seattle, Washington 98109
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41
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Affiliation(s)
- Theresa M Busch
- Department of Radiation Oncology, University of Pennsylvania, Philadelphia, Pennsylvania 19104-6072, USA
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42
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Ji H, Peng Y, Meckes N, Allen S, Stewart CN, Traw MB. ATP-dependent binding cassette transporter G family member 16 increases plant tolerance to abscisic acid and assists in basal resistance against Pseudomonas syringae DC3000. Plant Physiol 2014; 166:879-88. [PMID: 25146567 PMCID: PMC4213115 DOI: 10.1104/pp.114.248153] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/05/2014] [Accepted: 08/21/2014] [Indexed: 05/18/2023]
Abstract
Plants have been shown previously to perceive bacteria on the leaf surface and respond by closing their stomata. The virulent bacterial pathogen Pseudomonas syringae pv tomato DC3000 (PstDC3000) responds by secreting a virulence factor, coronatine, which blocks the functioning of guard cells and forces stomata to reopen. After it is inside the leaf, PstDC3000 has been shown to up-regulate abscisic acid (ABA) signaling and thereby suppress salicylic acid-dependent resistance. Some wild plants exhibit resistance to PstDC3000, but the mechanisms by which they achieve this resistance remain unknown. Here, we used genome-wide association mapping to identify an ATP-dependent binding cassette transporter gene (ATP-dependent binding cassette transporter G family member16) in Arabidopsis (Arabidopsis thaliana) that contributes to wild plant resistance to PstDC3000. Through microarray analysis and β-glucuronidase reporter lines, we showed that the gene is up-regulated by ABA, bacterial infection, and coronatine. We also used a green fluorescent protein fusion protein and found that transporter is more likely to localize on plasma membranes than in cell walls. Transferred DNA insertion lines exhibited consistent defective tolerance of exogenous ABA and reduced resistance to infection by PstDC3000. Our conclusion is that ATP-dependent binding cassette transporter G family member16 is involved in ABA tolerance and contributes to plant resistance against PstDC3000. This is one of the first examples, to our knowledge, of ATP-dependent binding cassette transporter involvement in plant resistance to infection by a bacterial pathogen. It also suggests a possible mechanism by which plants reduce the deleterious effects of ABA hijacking during pathogen attack. Collectively, these results improve our understanding of basal resistance in Arabidopsis and offer unique ABA-related targets for improving the innate resistance of plants to bacterial infection.
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Affiliation(s)
- Hao Ji
- Department of Biological Sciences, University of Pittsburgh, Pittsburgh, Pennsylvania 15260 (H.J., N.M., M.B.T.); andDepartment of Plant Sciences, University of Tennessee, Knoxville, Tennessee 37996 (Y.P., S.A., C.N.S.)
| | - Yanhui Peng
- Department of Biological Sciences, University of Pittsburgh, Pittsburgh, Pennsylvania 15260 (H.J., N.M., M.B.T.); andDepartment of Plant Sciences, University of Tennessee, Knoxville, Tennessee 37996 (Y.P., S.A., C.N.S.)
| | - Nicole Meckes
- Department of Biological Sciences, University of Pittsburgh, Pittsburgh, Pennsylvania 15260 (H.J., N.M., M.B.T.); andDepartment of Plant Sciences, University of Tennessee, Knoxville, Tennessee 37996 (Y.P., S.A., C.N.S.)
| | - Sara Allen
- Department of Biological Sciences, University of Pittsburgh, Pittsburgh, Pennsylvania 15260 (H.J., N.M., M.B.T.); andDepartment of Plant Sciences, University of Tennessee, Knoxville, Tennessee 37996 (Y.P., S.A., C.N.S.)
| | - C Neal Stewart
- Department of Biological Sciences, University of Pittsburgh, Pittsburgh, Pennsylvania 15260 (H.J., N.M., M.B.T.); andDepartment of Plant Sciences, University of Tennessee, Knoxville, Tennessee 37996 (Y.P., S.A., C.N.S.)
| | - M Brian Traw
- Department of Biological Sciences, University of Pittsburgh, Pittsburgh, Pennsylvania 15260 (H.J., N.M., M.B.T.); andDepartment of Plant Sciences, University of Tennessee, Knoxville, Tennessee 37996 (Y.P., S.A., C.N.S.)
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43
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Rosenfeldt MT, Bell LA, Long JS, O'Prey J, Nixon C, Roberts F, Dufès C, Ryan KM. E2F1 drives chemotherapeutic drug resistance via ABCG2. Oncogene 2014; 33:4164-72. [PMID: 24276245 DOI: 10.1038/onc.2013.470] [Citation(s) in RCA: 33] [Impact Index Per Article: 3.3] [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] [Received: 03/11/2013] [Revised: 09/12/2013] [Accepted: 10/06/2013] [Indexed: 12/18/2022]
Abstract
Multidrug resistance is a major barrier against successful chemotherapy, and this has been shown in vitro to be often caused by ATP-binding cassette (ABC) transporters. These transporters are frequently overexpressed in human cancers and confer an adverse prognosis in many common malignancies. The genetic factors, however, that initiate their expression in cancer are largely unknown. Here we report that the major multidrug transporter ABCG2 (BCRP/MXR) is directly and specifically activated by the transcription factor E2F1--a factor perturbed in the majority of human cancers. E2F1 regulates ABCG2 expression in multiple cell systems, and, importantly, we have identified a significant correlation between elevated E2F1 and ABCG2 expression in human lung cancers. We show that E2F1 causes chemotherapeutic drug efflux both in vitro and in vivo via ABCG2. Furthermore, the E2F1-ABCG2 axis suppresses chemotherapy-induced cell death that can be restored by the inhibition of ABCG2. These findings therefore identify a new axis in multidrug resistance and highlight a radical new function of E2F1 that is relevant to tumor therapy.
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Affiliation(s)
- M T Rosenfeldt
- Tumour Cell Death Laboratory, Cancer Research UK Beatson Institute, Glasgow, UK
| | - L A Bell
- Tumour Cell Death Laboratory, Cancer Research UK Beatson Institute, Glasgow, UK
| | - J S Long
- Tumour Cell Death Laboratory, Cancer Research UK Beatson Institute, Glasgow, UK
| | - J O'Prey
- Tumour Cell Death Laboratory, Cancer Research UK Beatson Institute, Glasgow, UK
| | - C Nixon
- Tumour Cell Death Laboratory, Cancer Research UK Beatson Institute, Glasgow, UK
| | - F Roberts
- Department of Pathology, Western Infirmary, Glasgow, UK
| | - C Dufès
- Strathclyde Institute of Pharmacy and Biomedical Sciences, University of Strathclyde, Glasgow, UK
| | - K M Ryan
- Tumour Cell Death Laboratory, Cancer Research UK Beatson Institute, Glasgow, UK
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Landgraf R, Smolka U, Altmann S, Eschen-Lippold L, Senning M, Sonnewald S, Weigel B, Frolova N, Strehmel N, Hause G, Scheel D, Böttcher C, Rosahl S. The ABC transporter ABCG1 is required for suberin formation in potato tuber periderm. Plant Cell 2014; 26:3403-15. [PMID: 25122151 PMCID: PMC4371835 DOI: 10.1105/tpc.114.124776] [Citation(s) in RCA: 33] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/28/2014] [Revised: 07/04/2014] [Accepted: 07/16/2014] [Indexed: 05/18/2023]
Abstract
The lipid biopolymer suberin plays a major role as a barrier both at plant-environment interfaces and in internal tissues, restricting water and nutrient transport. In potato (Solanum tuberosum), tuber integrity is dependent on suberized periderm. Using microarray analyses, we identified ABCG1, encoding an ABC transporter, as a gene responsive to the pathogen-associated molecular pattern Pep-13. Further analyses revealed that ABCG1 is expressed in roots and tuber periderm, as well as in wounded leaves. Transgenic ABCG1-RNAi potato plants with downregulated expression of ABCG1 display major alterations in both root and tuber morphology, whereas the aerial part of the ABCG1-RNAi plants appear normal. The tuber periderm and root exodermis show reduced suberin staining and disorganized cell layers. Metabolite analyses revealed reduction of esterified suberin components and hyperaccumulation of putative suberin precursors in the tuber periderm of RNA interference plants, suggesting that ABCG1 is required for the export of suberin components.
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Affiliation(s)
- Ramona Landgraf
- Leibniz Institute of Plant Biochemistry, Department of Stress and Developmental Biology, D-06120 Halle (Saale), Germany
| | - Ulrike Smolka
- Leibniz Institute of Plant Biochemistry, Department of Stress and Developmental Biology, D-06120 Halle (Saale), Germany
| | - Simone Altmann
- Leibniz Institute of Plant Biochemistry, Department of Stress and Developmental Biology, D-06120 Halle (Saale), Germany
| | - Lennart Eschen-Lippold
- Leibniz Institute of Plant Biochemistry, Department of Stress and Developmental Biology, D-06120 Halle (Saale), Germany
| | - Melanie Senning
- Friedrich Alexander University Erlangen-Nürnberg, Department of Biology, D-91058 Erlangen, Germany
| | - Sophia Sonnewald
- Friedrich Alexander University Erlangen-Nürnberg, Department of Biology, D-91058 Erlangen, Germany
| | - Benjamin Weigel
- Leibniz Institute of Plant Biochemistry, Department of Bioorganic Chemistry, D-06120 Halle (Saale), Germany
| | - Nadezhda Frolova
- Leibniz Institute of Plant Biochemistry, Department of Stress and Developmental Biology, D-06120 Halle (Saale), Germany
| | - Nadine Strehmel
- Leibniz Institute of Plant Biochemistry, Department of Stress and Developmental Biology, D-06120 Halle (Saale), Germany
| | - Gerd Hause
- Martin Luther University Halle-Wittenberg, Biocenter, D-06120 Halle (Saale), Germany
| | - Dierk Scheel
- Leibniz Institute of Plant Biochemistry, Department of Stress and Developmental Biology, D-06120 Halle (Saale), Germany
| | - Christoph Böttcher
- Leibniz Institute of Plant Biochemistry, Department of Stress and Developmental Biology, D-06120 Halle (Saale), Germany
| | - Sabine Rosahl
- Leibniz Institute of Plant Biochemistry, Department of Stress and Developmental Biology, D-06120 Halle (Saale), Germany
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45
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Statkiewicz M, Maryan N, Lipiec A, Grecka E, Grygorowicz MA, Omiotek M, Gorska A, Mikula M, Malecki M. The role of the SHH gene in prostate cancer cell resistance to paclitaxel. Prostate 2014; 74:1142-52. [PMID: 24925370 DOI: 10.1002/pros.22830] [Citation(s) in RCA: 18] [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] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/18/2014] [Accepted: 05/07/2014] [Indexed: 11/08/2022]
Abstract
BACKGROUND The increased activity of the Sonic Hedgehog (SHH) pathway has been demonstrated in many types of cancer including prostate cancer (PCa). It has been shown that SHH pathway is involved in tumor angiogenesis and in regulation of metabolism of cancer stem cells. The increased activity of the SHH pathway is responsible for generation and maintenance of the multidrug resistance in cancer cells. A key role in the development of this insensitivity to cytotoxic drugs play ATP-binding cassette (ABC) transporters. METHODS SHH encoding plasmid was stably transfected into PCa cell lines DU145 and LNCaP. The expression of SHH was silenced by shRNA and the level of SHH was tested by quantitative (q)PCR and western blot methods. The effect of SHH overexpression in cells after treatment with paclitaxel was measured by MTT assay, crystal violet assay and flow cytometry. The level of 44 ABC transporters was estimated by qPCR. RESULTS Expression of exogenous SHH protein in DU145 and LNCaP cell lines enhanced their resistance to paclitaxel along with increased expression of ABC transporters transcripts. Paclitaxel treatment further enhanced the expression of increased ABC transporters transcripts in cells overexpressing SHH. CONCLUSIONS Overexpression of SHH enhances PCa cell lines resistance to paclitaxel. Higher level of SHH leads to increase in ABC transporters expression in a manner dependent on paclitaxel.
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Affiliation(s)
- Malgorzata Statkiewicz
- Department of Genetics, Maria Sklodowska-Curie Memorial Cancer Center and Institute of Oncology, Warsaw, Poland
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Huang XC, Xiao X, Zhang YK, Talele TT, Salim AA, Chen ZS, Capon RJ. Lamellarin O, a pyrrole alkaloid from an Australian marine sponge, Ianthella sp., reverses BCRP mediated drug resistance in cancer cells. Mar Drugs 2014; 12:3818-37. [PMID: 24979269 PMCID: PMC4113800 DOI: 10.3390/md12073818] [Citation(s) in RCA: 55] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/29/2014] [Revised: 06/13/2014] [Accepted: 06/16/2014] [Indexed: 12/21/2022] Open
Abstract
ATP binding cassette (ABC) transporters, such as P-gp, BCRP and MRP1, can increase efflux of clinical chemotherapeutic agents and lead to multi-drug resistance (MDR) in cancer cells. While the discovery and development of clinically useful inhibitors has proved elusive to date, this molecular target nevertheless remains a promising strategy for addressing and potentially overcoming MDR. In a search for new classes of inhibitor, we used fluorescent accumulation and efflux assays supported by cell flow cytometry and MDR reversal assays, against a panel of sensitive and MDR human cancer cell lines, to evaluate the marine sponge co-metabolites 1–12 as inhibitors of P-gp, BCRP or MRP1 initiated MDR. These studies identified and characterized lamellarin O (11) as a selective inhibitor of BCRP mediated drug efflux. A structure–activity relationship analysis inclusive of the natural products 1–12 and the synthetic analogues 13–19, supported by in silico docking studies, revealed key structural requirements for the lamellarin O (11) BCRP inhibitory pharmacophore.
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Affiliation(s)
- Xiao-Cong Huang
- Division of Chemistry and Structural Biology, Institute for Molecular Bioscience, The University of Queensland, Brisbane QLD 4072, Australia.
| | - Xue Xiao
- Division of Chemistry and Structural Biology, Institute for Molecular Bioscience, The University of Queensland, Brisbane QLD 4072, Australia.
| | - Yun-Kai Zhang
- Department of Pharmaceutical Sciences, College of Pharmacy and Health Sciences, St. John's University, Queens, NY 11439, USA.
| | - Tanaji T Talele
- Department of Pharmaceutical Sciences, College of Pharmacy and Health Sciences, St. John's University, Queens, NY 11439, USA.
| | - Angela A Salim
- Division of Chemistry and Structural Biology, Institute for Molecular Bioscience, The University of Queensland, Brisbane QLD 4072, Australia.
| | - Zhe-Sheng Chen
- Department of Pharmaceutical Sciences, College of Pharmacy and Health Sciences, St. John's University, Queens, NY 11439, USA.
| | - Robert J Capon
- Division of Chemistry and Structural Biology, Institute for Molecular Bioscience, The University of Queensland, Brisbane QLD 4072, Australia.
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Meng D, Gu Z, Li W, Wang A, Yuan H, Yang Q, Li T. Apple MdABCF assists in the transportation of S-RNase into pollen tubes. Plant J 2014; 78:990-1002. [PMID: 24684704 DOI: 10.1111/tpj.12524] [Citation(s) in RCA: 46] [Impact Index Per Article: 4.6] [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: 12/02/2013] [Revised: 03/03/2014] [Accepted: 03/26/2014] [Indexed: 05/25/2023]
Abstract
Self-incompatibility (SI) is a reproductive isolation mechanism in flowering plants. Plants in the Solanaceae, Rosaceae and Plantaginaceae belong to the gametophytic self-incompatibility type. S-RNase, which is encoded by a female-specific gene located at the S locus, degrades RNA in the pollen tube and causes SI. Recent studies have provided evidence that S-RNase is transported non-selectively into the pollen tube, but have not specified how this transportation is accomplished. We show here that the apple (Malus domestica) MdABCF protein, which belongs to group F of the ABC transporter family, assists in transportation of S-RNase into the pollen tube. MdABCF is located in the pollen tube membrane and interacts with S-RNase. S-RNase was unable to enter the pollen tube when MdABCF was silenced by antisense oligonucleotide transfection. Our results show that MdABCF assists in transportation of either self or non-self S-RNase into the pollen tube. Moreover, MdABCF coordinates with the cytoskeleton to transport S-RNase. Blockage of S-RNase transport disrupts self-incompatibility in this system.
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Affiliation(s)
- Dong Meng
- Laboratory of Fruit Cell and Molecular Breeding, College of Agronomy and Bio-Tech, China Agricultural University, Beijing, 100193, China
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48
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Iwaki T, Fujita Y, Tanaka N, Giga-Hama Y, Takegawa K. Mitochondrial ABC Transporter Atm1p Is Required for Protection against Oxidative Stress and Vacuolar Functions inSchizosaccharomyces pombe. Biosci Biotechnol Biochem 2014; 69:2109-16. [PMID: 16306692 DOI: 10.1271/bbb.69.2109] [Citation(s) in RCA: 7] [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: 01/12/2023]
Abstract
A potential correlation between mitochondrial and vacuolar functions is known to exit in yeast. Fission yeast atm1(+), SPAC15A10.01, encodes a putative half-type ABC transporter with an N-terminal mitochondrial-targeting signal. In an attempt to evaluate the possible involvement of mitochondrion in vacuole function, a functional analysis of atm1(+) was performed by gene disruption. Growth of the atm1 mutant was inhibited in the presence of oxidizing agents, and S. cerevisiae Atm1p was found to complement this growth defect. atm1Delta cells exhibited defects in fluid-phase endocytosis and vacuolar fusion under hypotonic stress. GFP-tagged Atm1p was observed to be localized in the mitochondria. These data strongly suggest that fission yeast Atm1p was not only involved in protection against oxidative stress, but also played a role in vacuolar functions.
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Affiliation(s)
- Tomoko Iwaki
- Department of Life Sciences, Faculty of Agriculture, Kagawa University, Japan
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49
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Ichida K. [Recent progress and prospects for research on urate efflux transporter ABCG2]. Nihon Rinsho 2014; 72:757-765. [PMID: 24796111] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
ABCG2 is a high-capacity urate exporter. Two frequent variants, Q126X and Q141K are a nonfunctional and half-functional variant, respectively. The estimated ABCG2 dysfunction based on the combination of Q126X and Q141K haplotype raises gout/hyperuricemia risk. ABCG2 dysfunction accounts for about 80% of gouty patients. Severe ABCG2 dysfunction particularly increased the risk of early-onset gout. Hyperuricemia has been clinically classified into urate 'overproduction type' and/or 'underexcretion type' based solely on renal urate excretion, without considering an extra-renal pathway. A major cause of'overproduction' hyperuricemia is not true overproduction of urate but rather'extra-renal urate underexcretion' by common ABCG2 dysfunction. As ABCG2 dysfunction is a main cause of gout, ABCG2 research will provide a new approach for prevention and treatment of gout.
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Abstract
The human ATP-binding cassette (ABC) superfamily consists of 48 members with 14 of them identified in normal human liver at the protein level. Most of the ABC members act as ATP dependent efflux transport systems. In the liver, ABC transporters are involved in diverse physiological processes including export of cholesterol, bile salts, and metabolic endproducts. Consequently, impaired ABC transporter function is involved in inherited diseases like sitosterolemia, hyperbilirubinemia, or cholestasis. Furthermore, altered expression of some of the hepatic ABCs have been associated with primary liver tumors. This review gives a short overview about the function of hepatic ABCs. Special focus is addressed on the localization and ontogenesis of ABC transporters in the human liver. In addition, their expression pattern in primary liver tumors is discussed.
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Affiliation(s)
- Katrin Wlcek
- Department of Clinical Pharmacology and Toxicology, University Hospital Zurich, Zurich, Switzerland
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