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Mason DJ, Timofeyenko YG, Jagadish B, Mash EA. Palladium-catalyzed hydrogenations in dichloromethane. SYNTHETIC COMMUN 2022. [DOI: 10.1080/00397911.2022.2115928] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/14/2022]
Affiliation(s)
- David J. Mason
- Department of Chemistry and Biochemistry, University of Arizona, Tucson, AZ, USA
| | - Yegor G. Timofeyenko
- Department of Chemistry and Biochemistry, University of Arizona, Tucson, AZ, USA
| | | | - Eugene A. Mash
- Department of Chemistry and Biochemistry, University of Arizona, Tucson, AZ, USA
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2
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Omar H, Moosa B, Alamoudi K, Anjum DH, Emwas AH, El Tall O, Vu B, Tamanoi F, AlMalik A, Khashab NM. Impact of Pore-Walls Ligand Assembly on the Biodegradation of Mesoporous Organosilica Nanoparticles for Controlled Drug Delivery. ACS OMEGA 2018; 3:5195-5201. [PMID: 31458733 PMCID: PMC6641955 DOI: 10.1021/acsomega.8b00418] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/06/2018] [Accepted: 04/19/2018] [Indexed: 05/20/2023]
Abstract
Porous materials with molecular-scale ordering have attracted major attention mainly because of the possibility to engineer their pores for selective applications. Periodic mesoporous organosilica is a class of hybrid materials where self-assembly of the organic linkers provides a crystal-like pore wall. However, unlike metal coordination, specific geometries cannot be predicted because of the competitive and dynamic nature of noncovalent interactions. Herein, we study the influence of competing noncovalent interactions in the pore walls on the biodegradation of organosilica frameworks for drug delivery application. These results support the importance of studying self-assembly patterns in hybrid frameworks to better engineer the next generation of dynamic or "soft" porous materials.
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Affiliation(s)
- Haneen Omar
- Smart
Hybrid Materials Laboratory, Advanced Membranes, and Porous Materials
Center, King Abdullah University of Science
and Technology, Thuwal 23955-6900, Saudi Arabia
| | - Basem Moosa
- Smart
Hybrid Materials Laboratory, Advanced Membranes, and Porous Materials
Center, King Abdullah University of Science
and Technology, Thuwal 23955-6900, Saudi Arabia
| | - Kholod Alamoudi
- Smart
Hybrid Materials Laboratory, Advanced Membranes, and Porous Materials
Center, King Abdullah University of Science
and Technology, Thuwal 23955-6900, Saudi Arabia
| | - Dalaver H. Anjum
- King
Abdullah University of Science and Technology (KAUST), Core Labs, Thuwal 23955-6900, Saudi Arabia
| | - Abdul-Hamid Emwas
- King
Abdullah University of Science and Technology (KAUST), Core Labs, Thuwal 23955-6900, Saudi Arabia
| | - Omar El Tall
- King
Abdullah University of Science and Technology (KAUST), Core Labs, Thuwal 23955-6900, Saudi Arabia
| | - Binh Vu
- Department
of Microbiology, Immunology and Molecular Genetics, Jonsson Comprehensive
Cancer Center, Molecular Biology Institute, University of California, Los
Angeles, California 90095-1489, United States
| | - Fuyu Tamanoi
- Department
of Microbiology, Immunology and Molecular Genetics, Jonsson Comprehensive
Cancer Center, Molecular Biology Institute, University of California, Los
Angeles, California 90095-1489, United States
| | - Abdulaziz AlMalik
- Life
Sciences and Environment Research Institute, Center of Excellence
in Nanomedicine (CENM), King Abdulaziz City
for Science and Technology (KACST), Riyadh 11461, Saudi Arabia
- E-mail: (A.A.)
| | - Niveen M. Khashab
- Smart
Hybrid Materials Laboratory, Advanced Membranes, and Porous Materials
Center, King Abdullah University of Science
and Technology, Thuwal 23955-6900, Saudi Arabia
- E-mail: (N.M.K.)
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Hayashi JY, Tamanoi F. Exploiting Enzyme Alterations in Cancer for Drug Activation, Drug Delivery, and Nanotherapy. Enzymes 2017; 42:153-172. [PMID: 29054269 DOI: 10.1016/bs.enz.2017.08.005] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
Alterations of enzyme activity or enzyme levels in cancer tissue have been documented over the years. Taking advantage of these observations, various strategies for drug activation and drug delivery have been developed. One example is a mechanism called "prodrugs" that generates active drugs by enzyme cleavage. Another example is enzyme-induced anticancer drug release mechanisms. This system is constructed by incorporating enzyme-sensitive linkages to materials such as hydrogels and nanodelivery vehicles, including liposomes, polymer micelles, and mesoporous silica nanoparticles. Various release mechanisms for anticancer drugs and siRNA have been developed. In addition, enzyme cleavage is utilized in nanodelivery vehicles that contain nanomachines. One example is nanovalve that can be opened by enzyme cleavage. Another example is enzyme-induced release of nanoparticles from multistage vehicles. Finally, colon-specific drug delivery by azoreductase cleavable mechanism is discussed.
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Affiliation(s)
- Joel Y Hayashi
- Jonsson Comprehensive Cancer Center, Molecular Biology Institute, University of California, Los Angeles, Los Angeles, CA, United States; Institute for Integrated Cell-Material Sciences, Institute for Advanced Study, Kyoto University, Kyoto, Japan
| | - Fuyuhiko Tamanoi
- Jonsson Comprehensive Cancer Center, Molecular Biology Institute, University of California, Los Angeles, Los Angeles, CA, United States; Institute for Integrated Cell-Material Sciences, Institute for Advanced Study, Kyoto University, Kyoto, Japan.
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Radhakrishnan VM, Kojs P, Ramalingam R, Midura-Kiela MT, Angeli P, Kiela PR, Ghishan FK. Experimental colitis is associated with transcriptional inhibition of Na+/Ca2+ exchanger isoform 1 (NCX1) expression by interferon γ in the renal distal convoluted tubules. J Biol Chem 2015; 290:8964-74. [PMID: 25648899 DOI: 10.1074/jbc.m114.616516] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/03/2014] [Indexed: 01/20/2023] Open
Abstract
NCX1 is a Na(+)/Ca(2+) exchanger, which is believed to provide a key route for basolateral Ca(2+) efflux in the renal epithelia, thus contributing to renal Ca(2+) reabsorption. Altered mineral homeostasis, including intestinal and renal Ca(2+) transport may represent a significant component of the pathophysiology of the bone mineral density loss associated with Inflammatory Bowel Diseases (IBD). The objective of our research was to investigate the effects of TNBS and DSS colitis and related inflammatory mediators on renal Ncx1 expression. Colitis was associated with decreased renal Ncx1 expression, as examined by real-time RT-PCR, Western blotting, and immunofluorescence. In mIMCD3 cells, IFNγ significantly reduced Ncx1 mRNA and protein expression. Similar effects were observed in cells transiently transfected with a reporter construct bearing the promoter region of the kidney-specific Ncx1 gene. This inhibitory effect of IFNγ is mediated by STAT1 recruitment to the proximal promoter region of Ncx1. Further in vivo study with Stat1(-/-) mice confirmed that STAT1 is indeed required for the IFNγ mediated Ncx1 gene regulation. These results strongly support the hypothesis that impaired renal Ca(2+) handling occurs in experimental colitis. Negative regulation of NCX1- mediated renal Ca(2+) absorption by IFNγ may significantly contribute to the altered Ca(2+) homeostasis in IBD patients and to IBD-associated loss of bone mineral density.
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Affiliation(s)
| | - Pawel Kojs
- From the Departments of Pediatrics, Steele Children's Research Center and
| | | | | | - Peter Angeli
- Zanvyl Krieger School of Arts and Sciences Johns Hopkins University, Baltimore, Maryland 21218
| | - Pawel R Kiela
- From the Departments of Pediatrics, Steele Children's Research Center and Immunobiology, University of Arizona Health Sciences Center, Tucson, Arizona 85724, and
| | - Fayez K Ghishan
- From the Departments of Pediatrics, Steele Children's Research Center and
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Zakhireh S, Mahkam M, Yadollahi M, Jafarirad S. Investigation of pH-sensitive galactopyranoside glycol hydrogels as effective vehicles for oral drug delivery. JOURNAL OF POLYMER RESEARCH 2014. [DOI: 10.1007/s10965-014-0398-3] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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Martinez GV, Navath S, Sewda K, Rao V, Foroutan P, Alleti R, Moberg VE, Ahad AM, Coppola D, Lloyd MC, Gillies RJ, Morse DL, Mash EA. Demonstration of a sucrose-derived contrast agent for magnetic resonance imaging of the GI tract. Bioorg Med Chem Lett 2013; 23:2061-4. [PMID: 23481651 DOI: 10.1016/j.bmcl.2013.02.008] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/07/2012] [Revised: 01/24/2013] [Accepted: 02/01/2013] [Indexed: 11/19/2022]
Abstract
A scaffold bearing eight terminal alkyne groups was synthesized from sucrose, and copies of an azide-terminated Gd-DOTA complex were attached via copper(I)-catalyzed azide-alkyne cycloaddition. The resulting contrast agent (CA) was administered by gavage to C3H mice. Passage of the CA through the gastrointestinal (GI) tract was followed by T1-weighted magnetic resonance imaging (MRI) over a period of 47h, by which time the CA had exited the GI tract. No evidence for leakage of the CA from the GI tract was observed. Thus, a new, orally administered CA for MRI of the GI tract has been developed and successfully demonstrated.
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Affiliation(s)
- Gary V Martinez
- Department of Cancer Imaging and Metabolism, H. Lee Moffitt Cancer Center & Research Institute, Tampa, FL 33612, USA
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