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Predicate | Object |
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rdf:type | |
lifeskim:mentions | |
pubmed:issue |
2
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pubmed:dateCreated |
1995-3-17
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pubmed:abstractText |
Standard protocols for in vitro transcription assay (nuclear run-off) include 10-40% (v/v) glycerol (of various ionic strength) in the medium used for resuspension/storage of the isolated nuclei. In the present work the morphological and functional properties of nuclei isolated from rat liver have been studied as a function of the content of glycerol, sucrose and inorganic ions (K+ and Mg2+) in the resuspension medium. In contrast to earlier reports, glycerol was found not to be essential to maintain morphological integrity and RNA polymerase activity in frozen/stored nuclei. Nuclear pellets, resuspended and stored in isoosmotic sucrose media, were found to give morphologically intact and transcriptionally active nuclei. Furthermore, these nuclei displayed a higher specific hybridization signal for the differentially expressed genes encoding peroxisomal beta-oxidation enzymes, relative to the total RNA synthesis, than nuclei resuspended and stored in a hyperosmotic glycerol-containing medium. The concentrations of inorganic ions were also found to affect nuclear morphology. Flow cytometry indicated DNA leakage from nuclei at insufficient concentrations of K+ and Mg2+, and high ionic strength favoured aggregation and disintegration of nuclei. Our findings indicate that quantitative results from nuclear run-off experiments should be interpreted with caution until the process of transcription in isolated nuclei is better understood.
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pubmed:language |
eng
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pubmed:journal | |
pubmed:citationSubset |
IM
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pubmed:chemical |
http://linkedlifedata.com/resource/pubmed/chemical/Cryoprotective Agents,
http://linkedlifedata.com/resource/pubmed/chemical/DNA-Directed RNA Polymerases,
http://linkedlifedata.com/resource/pubmed/chemical/Glycerol,
http://linkedlifedata.com/resource/pubmed/chemical/Magnesium Chloride,
http://linkedlifedata.com/resource/pubmed/chemical/Potassium Chloride,
http://linkedlifedata.com/resource/pubmed/chemical/RNA, Messenger,
http://linkedlifedata.com/resource/pubmed/chemical/Sucrose
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pubmed:status |
MEDLINE
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pubmed:month |
Oct
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pubmed:issn |
0300-8177
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pubmed:author | |
pubmed:issnType |
Print
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pubmed:day |
26
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pubmed:volume |
139
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pubmed:owner |
NLM
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pubmed:authorsComplete |
Y
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pubmed:pagination |
149-57
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pubmed:dateRevised |
2006-11-15
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pubmed:meshHeading |
pubmed-meshheading:7862105-Animals,
pubmed-meshheading:7862105-Cell Fractionation,
pubmed-meshheading:7862105-Cell Nucleus,
pubmed-meshheading:7862105-Cryoprotective Agents,
pubmed-meshheading:7862105-DNA-Directed RNA Polymerases,
pubmed-meshheading:7862105-Female,
pubmed-meshheading:7862105-Glycerol,
pubmed-meshheading:7862105-Liver,
pubmed-meshheading:7862105-Magnesium Chloride,
pubmed-meshheading:7862105-Male,
pubmed-meshheading:7862105-Microbodies,
pubmed-meshheading:7862105-Osmolar Concentration,
pubmed-meshheading:7862105-Potassium Chloride,
pubmed-meshheading:7862105-RNA, Messenger,
pubmed-meshheading:7862105-Rats,
pubmed-meshheading:7862105-Rats, Wistar,
pubmed-meshheading:7862105-Sucrose,
pubmed-meshheading:7862105-Transcription, Genetic
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pubmed:year |
1994
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pubmed:articleTitle |
The choice of resuspension medium for isolated rat liver nuclei: effects on nuclear morphology and in vitro transcription.
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pubmed:affiliation |
Department of Biochemistry and Molecular Biology, University of Bergen, Norway.
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pubmed:publicationType |
Journal Article,
Comparative Study,
Research Support, Non-U.S. Gov't
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