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    • 9. 发明授权
    • Induction of asymmetry in vesicles
    • 诱导囊泡不对称
    • US5376452A
    • 1994-12-27
    • US132711
    • 1993-10-06
    • Michael J. HopePieter R. Cullis
    • Michael J. HopePieter R. Cullis
    • A61K9/127B01J13/06
    • A61K9/1277A61K9/1278Y10S436/829Y10T428/2984
    • Methods are described for controlling the transbilayer distribution of ionizable lipids and proteins in vesicles. Control of the ion gradient of the exterior bathing medium in relation to that of the interior entrapped aqueous compartment of the vesicles induces migration of ionizable lipids or proteins to one or the other of the monolayers comprising the bilayer. This can result in an asymmetric distribution of the ionizable lipid or ionizable protein. The basic ionizable lipids, such as stearylamine and sphingosine, are sequestered into the inner monolayer when the liposome interior is acidic relative to the liposome exterior. Conversely, acidic ionizable lipids such as oleic acid and stearic acid are sequestered into the inner monolayer when the liposome interior is basic relative to the liposome exterior bathing solution. Likewise, phospholipids such as phosphatidylglycerol, phosphatidylinositol, and cardiolipin may also be sequestered into the inner monolayer in response to a relatively acidic exterior medium. Such vesicles may contain bioactive agents and may be administered to mammals including humans.
    • 描述了用于控制囊泡中可离子化脂质和蛋白质的跨膜分布的方法。 外部洗浴介质的离子梯度的控制相对于囊泡的内部包封的水分区域的离子梯度的诱导将可电离的脂质或蛋白质迁移到包含双层的单层或另一个单层中。 这可导致可电离脂质或可电离蛋白质的不对称分布。 当脂质体内部相对于脂质体外部呈酸性时,碱性可离子化的脂质如硬脂胺和鞘氨醇被隔离在内层中。 相反,当脂质体内部相对于脂质体外部洗浴溶液是碱性时,酸性可离子化的脂质如油酸和硬脂酸被螯合到内部单层中。 同样地,磷酸酯如磷脂酰甘油,磷脂酰肌醇和心磷脂也可以响应于相对酸性的外部培养基而被隔离到内单层中。 这样的囊泡可以含有生物活性剂并且可以施用于包括人的哺乳动物。