کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
10533216 | 961856 | 2005 | 9 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Calcium enhances the transfection potency of stabilized plasmid-lipid particles
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
شیمی
شیمی آنالیزی یا شیمی تجزیه
پیش نمایش صفحه اول مقاله
![عکس صفحه اول مقاله: Calcium enhances the transfection potency of stabilized plasmid-lipid particles Calcium enhances the transfection potency of stabilized plasmid-lipid particles](/preview/png/10533216.png)
چکیده انگلیسی
Previous work from this laboratory has shown that plasmid DNA can be encapsulated in small (70-nm-diameter) stabilized plasmid-lipid particles (SPLP) that consist of a single plasmid encapsulated within a bilayer lipid vesicle. SPLP preferentially transfect tumor tissue following intravenous administration. Although the levels of transgene expression in vivo are greater for SPLP than can be achieved with naked DNA or complexes, they are lower than may be required for therapeutic benefit. In the present work we examine whether Ca2+ can enhance the transfection potency of SPLP. It is shown that Ca2+ can enhance SPLP transfection potency in bovine hamster kidney cells by 60- to 100-fold when treated in serum containing medium and an additional 60-fold when serum is absent for the initial 10Â min of the transfection period. When cells are treated with SPLP in the presence of Ca2+, there is a fivefold increase in intact plasmid in the cell. It is also shown that this Ca2+ effect involves the formation of calcium phosphate precipitates; however, these precipitates are not directly associated with the SPLP plasmid DNA. The ability of calcium phosphate to facilitate delivery of other macromolecules without direct association is also demonstrated by the release of large-molecular-weight dextrans from endosomal/lysosomal compartments in the presence of calcium phosphate. Finally, it is shown that, unlike naked DNA, SPLP transfection potency in the presence of calcium phosphate is not affected by nuclease activity.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Analytical Biochemistry - Volume 341, Issue 1, 1 June 2005, Pages 156-164
Journal: Analytical Biochemistry - Volume 341, Issue 1, 1 June 2005, Pages 156-164
نویسندگان
Ammen P. Sandhu, Angela M.I. Lam, David B. Fenske, Lorne R. Palmer, Michael Johnston, Pieter R. Cullis,