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ISSN 打印: 0743-4863

ISSN 在线: 2162-660X

The Impact Factor measures the average number of citations received in a particular year by papers published in the journal during the two preceding years. 2017 Journal Citation Reports (Clarivate Analytics, 2018) IF: 2.7 To calculate the five year Impact Factor, citations are counted in 2017 to the previous five years and divided by the source items published in the previous five years. 2017 Journal Citation Reports (Clarivate Analytics, 2018) 5-Year IF: 3.6 The Immediacy Index is the average number of times an article is cited in the year it is published. The journal Immediacy Index indicates how quickly articles in a journal are cited. Immediacy Index: 0.8 The Eigenfactor score, developed by Jevin West and Carl Bergstrom at the University of Washington, is a rating of the total importance of a scientific journal. Journals are rated according to the number of incoming citations, with citations from highly ranked journals weighted to make a larger contribution to the eigenfactor than those from poorly ranked journals. Eigenfactor: 0.00023 The Journal Citation Indicator (JCI) is a single measurement of the field-normalized citation impact of journals in the Web of Science Core Collection across disciplines. The key words here are that the metric is normalized and cross-disciplinary. JCI: 0.39 SJR: 0.42 SNIP: 0.89 CiteScore™:: 5.5 H-Index: 79

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Current Data on ATP-Containing Liposomes and Potential Prospects To Enhance Cellular Energy Status for Hepatic Applications

卷 25, 册 4, 2008, pp. 305-345
DOI: 10.1615/CritRevTherDrugCarrierSyst.v25.i4.10
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摘要

The pharmacological use of adenosine triphosphate (ATP), although promising, is restricted due to poor cellular penetration and drastic hydrolysis that is markedly accelerated in vivo by ectoenzymes. In the literature, liposomes have proven efficient in offering a physical barrier to extracellular enzymes and favor penetration into cells. First, this review addresses the issues raised by ATP development in pharmaceutics. Second, studies conducted with ATP liposomally entrapped (lipo-ATP) are described, including pharmaco-technical formulation engineering and related models of assessment. Finally, potential directions for research to better target ATP penetration into the liver are considered.
Lipo-ATP were formulated for a number of applications, including sepsis-related disorders; spermatozoid alteration; brain ischemia episodes; and ophthalmic, cardiac, and hepatic use. Key formulation parameters need to be carefully considered to optimize stability and entrapment yield value, and to define the manufacturing process. Positive lipids, such as stearylamine, increase entrapment yield value by electrostatic interaction with negatively charged ATP. A freezing-thawing step in the manufacturing process considerably increases entrapment yield value. Lipo-ATP were assessed using cell culture, isolated organs, and animal experimental models. Very promising results were obtained with antimyosin PEGylated immunoliposomes using isolated rat hearts and experimental myocardial infarction in rabbits. In hepatic applications, lipo-ATP are effective in preventing liver injury during shock and to improve the energy status of cold-stored rat liver, in particular, if liposomes are loaded with apolipoprotein E (ApoE). For liver delivery, liposome size needs to be lower than 100 nm to allow diffusion through the Disse space, but liposome flexibility and lipid content may also influence liver uptake. The role of the liposome charge remains unclear. ApoE and the ligand for the asialoglycoprotein receptor [ASGPr) were both used in the literature, but the ASGPr seems more promising. Ligand-ASGPr interaction is based on the sugar preference (N-acetylgalactosamine>>galactose), the antennary structure (tetra>tri>di>monoantennary), and sugar spacing. Numerous high-affinity ligands have been extracted or designed to target hepatocytes, which can be classified according to their origin (i.e., natural, hemisynthetic, or synthetic). Synthetic ASGPr, such as Gal-C4-Chol (cholesten-5-yloxy-N-(4-((1-imino-2-D-thiogalactosylethyl)formamide), are composed of a lipid anchor (e.g., cholesteryl), a spacer (C2 to C6 chain), and a sugar head (galactose or lactose). The formulation includes ligand incorporation, by either simple preincubation or covalent graft, onto preformulated liposomes or direct mixing with other lipids. The ligand-loaded liposomes encapsulated pharmacological agents, markers, or plasmid DNA. Interesting results were obtained with antitumor or antioxidant agents to promote drug penetration in cell culture (e.g., primary rat hepatocyte or HepG2) and specific targeting to hepatocyte in isolated perfused liver (pharmacokinetic studies). Effectiveness was demonstrated in experimental models (e.g., tumor-bearing animals and hepatotoxic models). These targeted formulations were less toxic than standard formulations and controls. A development scheme that can be applied to other drugs, which may benefit from improved hepatic targeting, is proposed to optimize liposome characteristics and ligand structure, including verifications such as the displacement-binding test, ligand incorporation, cell internalization, tissue diffusion, organ and receptor specificity, and efficiency in experimental models.

对本文的引用
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