Abstract:
:We have previously developed a simple gene transfection procedure mediated by cationic lipid vesicles for animal cells, in which a commercially available cationic surfactant, dimethyldioctadecyl ammonium bromide (DDAB), was used for making lipid vesicles. In the present study, we examined enhancement of transfection efficiency for this method by adding protamine to plasmid DNA solution before the formation of DNA/lipid vesicle complexes. Both free-base protamine and protamine sulfate provided enhanced transfection efficiency and expression level, but the optimal amount of the two protamines was different. The enhancement in transfection efficiency and expression level by protamines was observed in all the cell lines (COS-7, Hela, NIH3T3, MDCK, and BHK-21C13) and all the plasmids (pCMVbeta, pmiwZ, and pCH110) tested. The enhancement in both transfection efficiency and expression level was at most 20-fold compared with that using only DDAB lipid vesicles. Protamines seemed to protect DNA from degradation by DNase and promote DNA delivery into a nucleus.
journal_name
J Biochemjournal_title
Journal of biochemistryauthors
You J,Kamihira M,Iijima Sdoi
10.1093/oxfordjournals.jbchem.a022399keywords:
subject
Has Abstractpub_date
1999-06-01 00:00:00pages
1160-7issue
6eissn
0021-924Xissn
1756-2651journal_volume
125pub_type
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