Distribution and effects on cytochrome P450 system of two hexachlorobiphenyl isomers in the rat
Identifieur interne : 000A37 ( Istex/Corpus ); précédent : 000A36; suivant : 000A38Distribution and effects on cytochrome P450 system of two hexachlorobiphenyl isomers in the rat
Auteurs : M. Luotamo ; E. Elovaara ; H. Raunio ; O. Pelkonen ; V. Riihim Ki ; H. VainioSource :
- Archives of Toxicology [ 0340-5761 ] ; 1991-10-01.
Abstract
Abstract: Tissue distribution and effects induced by 2,2′,4,4′,5,5′-hexachlorobiphenyl (245-HCB) on cytochrome P450 isozymes were compared with those of 2,2′,3,3′,6,6′-hexachlorobiphenyl (236-HCB). Male Wistar rats were given a single intragastric dose (23 mg/kg body wt) of either isomer, and killed after 72 h. At termination the tissue concentrations of 245-HCB were considerably higher than those of 236-HCB, suggesting a more effective metabolism of the latter. The binding affinity of 236-HCB to cytochrome P450 was higher and the magnitude of binding greater than of 245-HCB. 245-HCB-treatment elevated the hepatic concentration of cytochrome P450 and also the activities of 7-pentoxyresorufin O-depentylase (50-fold), aniline p-hydroxylase (2-fold) and 7-ethoxycoumarin O-deethylase (2-fold), a response typical of phenobarbital-type inducers. In the Western immunoblot of liver microsomes from 245-HCB treated rats, an increased amount of P450IIB1/2 was detected by a monoclonal antibody 2-66-3, which specifically detects phenobarbital inducible isoenzymes. The minimum molecular mass of the P450 isozyme induced was 52 kDa. After 236-HCB administration, a weak inducing effect was observed.
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DOI: 10.1007/BF02098033
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<front><div type="abstract" xml:lang="en">Abstract: Tissue distribution and effects induced by 2,2′,4,4′,5,5′-hexachlorobiphenyl (245-HCB) on cytochrome P450 isozymes were compared with those of 2,2′,3,3′,6,6′-hexachlorobiphenyl (236-HCB). Male Wistar rats were given a single intragastric dose (23 mg/kg body wt) of either isomer, and killed after 72 h. At termination the tissue concentrations of 245-HCB were considerably higher than those of 236-HCB, suggesting a more effective metabolism of the latter. The binding affinity of 236-HCB to cytochrome P450 was higher and the magnitude of binding greater than of 245-HCB. 245-HCB-treatment elevated the hepatic concentration of cytochrome P450 and also the activities of 7-pentoxyresorufin O-depentylase (50-fold), aniline p-hydroxylase (2-fold) and 7-ethoxycoumarin O-deethylase (2-fold), a response typical of phenobarbital-type inducers. In the Western immunoblot of liver microsomes from 245-HCB treated rats, an increased amount of P450IIB1/2 was detected by a monoclonal antibody 2-66-3, which specifically detects phenobarbital inducible isoenzymes. The minimum molecular mass of the P450 isozyme induced was 52 kDa. After 236-HCB administration, a weak inducing effect was observed.</div>
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<abstract xml:lang="en"><p>Abstract: Tissue distribution and effects induced by 2,2′,4,4′,5,5′-hexachlorobiphenyl (245-HCB) on cytochrome P450 isozymes were compared with those of 2,2′,3,3′,6,6′-hexachlorobiphenyl (236-HCB). Male Wistar rats were given a single intragastric dose (23 mg/kg body wt) of either isomer, and killed after 72 h. At termination the tissue concentrations of 245-HCB were considerably higher than those of 236-HCB, suggesting a more effective metabolism of the latter. The binding affinity of 236-HCB to cytochrome P450 was higher and the magnitude of binding greater than of 245-HCB. 245-HCB-treatment elevated the hepatic concentration of cytochrome P450 and also the activities of 7-pentoxyresorufin O-depentylase (50-fold), aniline p-hydroxylase (2-fold) and 7-ethoxycoumarin O-deethylase (2-fold), a response typical of phenobarbital-type inducers. In the Western immunoblot of liver microsomes from 245-HCB treated rats, an increased amount of P450IIB1/2 was detected by a monoclonal antibody 2-66-3, which specifically detects phenobarbital inducible isoenzymes. The minimum molecular mass of the P450 isozyme induced was 52 kDa. After 236-HCB administration, a weak inducing effect was observed.</p>
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<term>2,2′,3,3′,6,6′-hexachlorobiphenyl</term>
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<Para>Tissue distribution and effects induced by 2,2′,4,4′,5,5′-hexachlorobiphenyl (245-HCB) on cytochrome P450 isozymes were compared with those of 2,2′,3,3′,6,6′-hexachlorobiphenyl (236-HCB). Male Wistar rats were given a single intragastric dose (23 mg/kg body wt) of either isomer, and killed after 72 h. At termination the tissue concentrations of 245-HCB were considerably higher than those of 236-HCB, suggesting a more effective metabolism of the latter. The binding affinity of 236-HCB to cytochrome P450 was higher and the magnitude of binding greater than of 245-HCB. 245-HCB-treatment elevated the hepatic concentration of cytochrome P450 and also the activities of 7-pentoxyresorufin O-depentylase (50-fold), aniline p-hydroxylase (2-fold) and 7-ethoxycoumarin O-deethylase (2-fold), a response typical of phenobarbital-type inducers. In the Western immunoblot of liver microsomes from 245-HCB treated rats, an increased amount of P450IIB1/2 was detected by a monoclonal antibody 2-66-3, which specifically detects phenobarbital inducible isoenzymes. The minimum molecular mass of the P450 isozyme induced was 52 kDa. After 236-HCB administration, a weak inducing effect was observed.</Para>
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<KeywordGroup Language="En"><Heading>Key words</Heading>
<Keyword>Polychlorinated biphenyls</Keyword>
<Keyword>2,2′,3,3′,6,6′-hexachlorobiphenyl</Keyword>
<Keyword>2,2′,4,4′,5,5′-hexachlorobiphenyl</Keyword>
<Keyword>Cytochrome P450 isoenzymes</Keyword>
<Keyword>Enzyme induction</Keyword>
<Keyword>Rat</Keyword>
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<DefinitionList><DefinitionListEntry><Term>245-HCB</Term>
<Description><Para>2,2′,4,4′,5,5′-hexachlorobiphenyl</Para>
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<affiliation>Department of Industrial Hygiene and Toxicology, Institute of Occupational Health, Helsinki, Finland</affiliation>
<role><roleTerm type="text">author</roleTerm>
</role>
</name>
<name type="personal"><namePart type="given">H.</namePart>
<namePart type="family">Raunio</namePart>
<affiliation>Department of Pharmacology, University of Oulu, Oulu, Finland</affiliation>
<role><roleTerm type="text">author</roleTerm>
</role>
</name>
<name type="personal"><namePart type="given">O.</namePart>
<namePart type="family">Pelkonen</namePart>
<affiliation>Department of Pharmacology, University of Oulu, Oulu, Finland</affiliation>
<role><roleTerm type="text">author</roleTerm>
</role>
</name>
<name type="personal"><namePart type="given">V.</namePart>
<namePart type="family">Riihimäki</namePart>
<affiliation>Department of Industrial Hygiene and Toxicology, Institute of Occupational Health, Helsinki, Finland</affiliation>
<role><roleTerm type="text">author</roleTerm>
</role>
</name>
<name type="personal"><namePart type="given">H.</namePart>
<namePart type="family">Vainio</namePart>
<affiliation>International Agency for Research on Cancer, Lyon, France</affiliation>
<role><roleTerm type="text">author</roleTerm>
</role>
</name>
<typeOfResource>text</typeOfResource>
<genre type="research-article" displayLabel="OriginalPaper"></genre>
<originInfo><publisher>Springer-Verlag</publisher>
<place><placeTerm type="text">Berlin/Heidelberg</placeTerm>
</place>
<dateIssued encoding="w3cdtf">1991-10-01</dateIssued>
<copyrightDate encoding="w3cdtf">1991</copyrightDate>
</originInfo>
<language><languageTerm type="code" authority="rfc3066">en</languageTerm>
<languageTerm type="code" authority="iso639-2b">eng</languageTerm>
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<abstract lang="en">Abstract: Tissue distribution and effects induced by 2,2′,4,4′,5,5′-hexachlorobiphenyl (245-HCB) on cytochrome P450 isozymes were compared with those of 2,2′,3,3′,6,6′-hexachlorobiphenyl (236-HCB). Male Wistar rats were given a single intragastric dose (23 mg/kg body wt) of either isomer, and killed after 72 h. At termination the tissue concentrations of 245-HCB were considerably higher than those of 236-HCB, suggesting a more effective metabolism of the latter. The binding affinity of 236-HCB to cytochrome P450 was higher and the magnitude of binding greater than of 245-HCB. 245-HCB-treatment elevated the hepatic concentration of cytochrome P450 and also the activities of 7-pentoxyresorufin O-depentylase (50-fold), aniline p-hydroxylase (2-fold) and 7-ethoxycoumarin O-deethylase (2-fold), a response typical of phenobarbital-type inducers. In the Western immunoblot of liver microsomes from 245-HCB treated rats, an increased amount of P450IIB1/2 was detected by a monoclonal antibody 2-66-3, which specifically detects phenobarbital inducible isoenzymes. The minimum molecular mass of the P450 isozyme induced was 52 kDa. After 236-HCB administration, a weak inducing effect was observed.</abstract>
<note>Original Investigations</note>
<subject><genre>Abbreviations</genre>
<topic>245-HCB : 2,2′,4,4′,5,5′-hexachlorobiphenyl</topic>
<topic>236-HCB : 2,2′,3,3′,6,6′-hexachlorobiphenyl</topic>
<topic>Mab : monoclonal antibody</topic>
</subject>
<relatedItem type="host"><titleInfo><title>Archives of Toxicology</title>
</titleInfo>
<titleInfo type="abbreviated"><title>Arch Toxicol</title>
</titleInfo>
<genre type="journal" displayLabel="Archive Journal"></genre>
<originInfo><dateIssued encoding="w3cdtf">1991-10-01</dateIssued>
<copyrightDate encoding="w3cdtf">1991</copyrightDate>
</originInfo>
<subject><genre>Biomedicine</genre>
<topic>Cancer Research</topic>
<topic>Pharmacology/Toxicology</topic>
<topic>Allergology</topic>
</subject>
<identifier type="ISSN">0340-5761</identifier>
<identifier type="eISSN">1432-0738</identifier>
<identifier type="JournalID">204</identifier>
<identifier type="IssueArticleCount">16</identifier>
<identifier type="VolumeIssueCount">8</identifier>
<part><date>1991</date>
<detail type="volume"><number>65</number>
<caption>vol.</caption>
</detail>
<detail type="issue"><number>8</number>
<caption>no.</caption>
</detail>
<extent unit="pages"><start>661</start>
<end>665</end>
</extent>
</part>
<recordInfo><recordOrigin>Springer-Verlag, 1991</recordOrigin>
</recordInfo>
</relatedItem>
<identifier type="istex">CF078C5F237C9EA173C0CD44CB8A21B41B4BBF7D</identifier>
<identifier type="DOI">10.1007/BF02098033</identifier>
<identifier type="ArticleID">BF02098033</identifier>
<identifier type="ArticleID">Art9</identifier>
<accessCondition type="use and reproduction" contentType="copyright">Springer-Verlag, 1991</accessCondition>
<recordInfo><recordContentSource>SPRINGER</recordContentSource>
<recordOrigin>Springer-Verlag, 1991</recordOrigin>
</recordInfo>
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