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rdf:type | |
lifeskim:mentions | |
pubmed:issue |
2
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pubmed:dateCreated |
1994-1-26
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pubmed:abstractText |
Molecular size exclusion (MSE), reversed-phase (RP), and anion-exchange (AE) high-performance liquid chromatography (HPLC) techniques were employed in combination with on-line radioactivity detection, in a study on the kinetic behaviour of 65Zn-, 64Cu- and [35S]cysteine-labelled metallothionein (MT) in rat hepatoma tissue culture (HTC) cells. MSE-HPLC of [35S]cysteine-labelled HTC cell cytosol resulted in co-eluting MT-I and MT-II isoforms (tR 19.80 min; Ve/Vo: 1.85). AE-HPLC of 65Zn-treated HTC cell cytosol yielded separated 65Zn MT-I (tR 11.5 min; I = 64 mM) and 65Zn MT-II (tR 14.5 min; I = 104 mM). RP-HPLC of 64Cu-treated HTC cytosol resulted in separated 64Cu MT-I (tR 26.4 min) and 64Cu MT-II (tR 23.4 min). Determination of the amino acid composition, apparent molecular mass and cysteine content of HTC MT-I and MT-II isoforms showed the characteristics of class I metallothioneins. The rate of dissociation of Zn2+ from Zn-MT could be determined from the losses of 65Zn from MT during a single AE-HPLC run, showing a Zn-MT dissociation half-life of 0.66 h. RP-HPLC showed a delay in incorporation of newly accumulated 64Cu into MT, possibly owing to the appearance of reduced glutathione as an intracellular copper-transfer compound. Application of compartmental analysis in [35S]-cysteine accumulation experiments permitted the determination of the actual rate of MT degradation; when 200 microM of Zn were applied, the MT degradation half-life was 2.0 +/- 0.8 h. These results indicate the potential of combined HPLC techniques and application of radionuclides in studies on the synthesis and degradation of MT and metal-MT complexes.
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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/Amino Acids,
http://linkedlifedata.com/resource/pubmed/chemical/Copper Radioisotopes,
http://linkedlifedata.com/resource/pubmed/chemical/Metallothionein,
http://linkedlifedata.com/resource/pubmed/chemical/Sulfur Radioisotopes,
http://linkedlifedata.com/resource/pubmed/chemical/Zinc Radioisotopes
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pubmed:status |
MEDLINE
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pubmed:month |
Sep
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pubmed:issn |
0021-9673
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pubmed:author | |
pubmed:issnType |
Print
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pubmed:day |
22
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pubmed:volume |
619
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pubmed:owner |
NLM
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pubmed:authorsComplete |
Y
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pubmed:pagination |
199-214
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pubmed:dateRevised |
2003-11-14
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pubmed:meshHeading |
pubmed-meshheading:8263092-Amino Acids,
pubmed-meshheading:8263092-Animals,
pubmed-meshheading:8263092-Cells, Cultured,
pubmed-meshheading:8263092-Chromatography, DEAE-Cellulose,
pubmed-meshheading:8263092-Chromatography, Gel,
pubmed-meshheading:8263092-Chromatography, High Pressure Liquid,
pubmed-meshheading:8263092-Copper Radioisotopes,
pubmed-meshheading:8263092-Cytosol,
pubmed-meshheading:8263092-Isomerism,
pubmed-meshheading:8263092-Liver Neoplasms, Experimental,
pubmed-meshheading:8263092-Metallothionein,
pubmed-meshheading:8263092-Rats,
pubmed-meshheading:8263092-Spectrophotometry, Ultraviolet,
pubmed-meshheading:8263092-Sulfur Radioisotopes,
pubmed-meshheading:8263092-Zinc Radioisotopes
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pubmed:year |
1993
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pubmed:articleTitle |
Determination of zinc-65, copper-64 and sulphur-35 labelled rat hepatoma tissue culture metallothioneins by high-performance liquid chromatography with on-line radioactivity detection.
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pubmed:affiliation |
Department of Radiochemistry, Interfaculty Reactor Institute, Delft University of Technology, Netherlands.
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pubmed:publicationType |
Journal Article
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