| Toxicity of polychlorinated biphenyl with special reference to porphyrin metabolism. | |
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MedLine Citation:
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PMID: 3921356 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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Oral administration of a commercial PCB mixture to chickens caused a hepatic-type porphyria characterized by hepatic accumulation and urinary excretion of uroporphyrin. To clarify the mechanism of the porphyrinogenic activity of these PCBs, we studied the structural requirement of synthetic PCB for porphyrinogenic activities by using the cultured chick embryo liver cells and examined the relationship between induction of delta-aminolevulinic acid (ALA) synthetase and inhibition of uroporphyrinogen decarboxylase. We established that the porphyrinogenic effect of PCBs exhibits a sharply defined structure-activity relationship in that only 3,4,3',4'-tetrachlorobiphenyl and 3,4,5,3',4',5'-hexachlorobiphenyl produced a marked accumulation of uroporphyrin. We also demonstrated that in ALA-supplemented cultures, these same compounds lead to accumulation of a large amount of uroporphyrin III, whereas with other PCBs, which were weak inducers of porphyrin synthesis, the accumulated porphyrin was mostly protoporphyrin. was mostly protoporphyrin. Kinetic studies of the sequential decarboxylation of uroporphyrinogen with purified uroporphyrinogen decarboxylase were performed. The 3,4,3',4'-tetrachlorobiphenyl and 3,4,5,3',4',5'-hexachlorobiphenyl strongly inhibit uroporphyrinogen decarboxylase directly at two steps, i.e. first in the formation of hexacarboxylic porphyrinogen III from heptacarboxylic porphyrinogen III and second in the formation of heptacarboxylic porphyrinogen III from uroporphyrinogen III. The results confirmed that porphyrinogenic PCBs primarily inhibit uroporphyrinogen decarboxylase, leading to a depletion of heme as a result of which synthesis of ALA synthetase increased. |
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Authors:
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S Sano; S Kawanishi; Y Seki |
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Publication Detail:
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Type: Journal Article |
Journal Detail:
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Title: Environmental health perspectives Volume: 59 ISSN: 0091-6765 ISO Abbreviation: Environ. Health Perspect. Publication Date: 1985 Feb |
Date Detail:
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Created Date: 1985-06-11 Completed Date: 1985-06-11 Revised Date: 2009-11-18 |
Medline Journal Info:
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Nlm Unique ID: 0330411 Medline TA: Environ Health Perspect Country: UNITED STATES |
Other Details:
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Languages: eng Pagination: 137-43 Citation Subset: IM |
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| MeSH Terms | |
Descriptor/Qualifier:
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5-Aminolevulinate Synthetase
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biosynthesis Animals Cells, Cultured Chickens Enzyme Induction Liver / metabolism* Mice Mice, Inbred C57BL Polychlorinated Biphenyls / toxicity* Porphyrias / chemically induced Porphyrins / metabolism* Structure-Activity Relationship Uroporphyrinogen Decarboxylase / antagonists & inhibitors |
| Chemical | |
Reg. No./Substance:
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0/Polychlorinated Biphenyls; 0/Porphyrins; EC 2.3.1.37/5-Aminolevulinate Synthetase; EC 4.1.1.37/Uroporphyrinogen Decarboxylase |
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From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
| Full Text | |
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Journal Information Journal ID (nlm-ta): Environ Health Perspect ISSN: 0091-6765 |
Article Information Download PDF  Print publication date: Month: 2 Year: 1985 Volume: 59First Page: 137 Last Page: 143 ID: 1568076 PubMed Id: 3921356 |
| Toxicity of polychlorinated biphenyl with special reference to porphyrin metabolism. | |
| S Sano | |
| S Kawanishi | |
| Y Seki | |
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