Bacterial lipopolysaccharide copurifies with plasmid DNA: implications for animal models and human gene therapy.
Bacterial lipopolysaccharide copurifies with plasmid DNA: implications for animal models and human gene therapy.
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细菌脂多糖与质粒 DNA 共纯化:对动物模型和人类基因治疗的影响。
DOI:
10.1089/hum.1995.6.3-317
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发表时间:
1995
期刊:
影响因子:
--
通讯作者:
Carson,DA
中科院分区:
文献类型:
--
作者:
Wicks,IP;Howell,ML;Hancock,T;Kohsaka,H;Olee,T;Carson,DA
During the course of gene therapy experiments in rodents, using intramuscular injections of plasmid DNA derived fromEscherichia coli, we noted dose-related toxicity. This observation prompted a search for possible contaminants of DNA samples. We used the highly specific and sensitive limulus amoebocyte lysate assay (LAL), to monitor endotoxin bioactivity in DNA samples, and found plasmid DNA derived from standardE. colibacterial strains, using traditional DNA isolation protocols, to be heavily contaminated with endotoxin, or lipopolysaccharide (LPA). Standard DNA isolation procedures result in the copurification of up to 500 μg/ml of LPS. LPS is a potent inducer of cytokines and other inflammatory mediators, and may complicate the use of naked DNA in gene therapy. The copurification of endotoxin with plasmid DNA also has important implications forin vitrotransfection studies and microinjection of DNA into embryos. A simple and efficient protocol to reduce LPS contamination of plasmid DNA was developed. The conversion of intact bacteria to spheroplasts prior to the isolation of plasmid DNA, incubation with lysozyme, treatment with the detergentn-octyl-β-d-thioglucopyranoside (OSPG) and polymyxin-B (PMB) chromatography, allowed the isolation of plasmid DNA containing less than 50 ng/ml LPS. This represents a 10,000-fold reduction in LPS contamination, compared to conventional methods of plasmid DNA purification, avoids potentially toxic reagents such as ethidium bromide, and produces a higher yield of plasmid DNA.
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影响因子:
3.3
作者:
Laura Santambrogio;G. Hochwald;C. Leu;G. Thorbecke
通讯作者:
G. Thorbecke
影响因子:
5.3
作者:
Sandri-Goldin,RM;Goldin,AL;Levine,M;Glorioso,JC
通讯作者:
Glorioso,JC
影响因子:
6.7
作者:
L. Montoro;E. Subías;P. Young;M. Baccaro;J. Swanson;C. Sueldo
通讯作者:
C. Sueldo
影响因子:
2.8
作者:
U. Seydel;H. Labischinski;M. Kastowsky;K. Brandenburg
通讯作者:
K. Brandenburg
DOI:
10.1111/j.1432-1033.1969.tb00601.x
发表时间:
1969-01-01
期刊:
EUROPEAN JOURNAL OF BIOCHEMISTRY
影响因子:
--
作者:
GALANOS, C;LUDERITZ, O;WESTPHAL, O
通讯作者:
WESTPHAL, O