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Incomplete correlation of 2,3,7,8-tetrachlorodibenzo-p-dioxin hepatotoxicity with Ah phenotype in mice.

Abstract：

:Pretreatment of male mice of the inbred strains A2G, BALB/c, C57BL/10, and AKR with iron dextran synergized the action of a single dose of 2,3,7,8-tetrachlorodibenzo-p-dioxin (TCDD, 75 micrograms/kg) in causing hepatic porphyria and necrosis 35 days later. There was no effect in DBA/2 mice. Increased porphyrin levels were associated with decreased hepatic activity of uroporphyrinogen decarboxylase. Iron alone had no effect on porphyrin levels or decarboxylase activity. In male BALB/c mice given TCDD alone there was a delay in the onset of porphyria. Female BALB/c, AKR, and AKR X DBA/2 F1 mice were more resistant to the porphyrinogenic effect of TCDD than males. Development of porphyria did not correlate with Ah phenotype of the mice. The inheritance of sensitivity to TCDD in crosses of the AKR and DBA/2 strains, both Ah nonresponsive, was studied by a biometrical genetic analysis. The inheritances of increased porphyrin levels and of increased plasma activity of enzymes indicative of hepatic necrosis were both complex. Segregation of alleles at more than one locus was required to explain the data. A lack of correlation of porphyrins with plasma enzyme levels in the F2 generation suggested that the expression of these traits was determined independently. Genes other than Ah influence the development of TCDD-induced hepatotoxicity in mice.

journal_name

Toxicol Appl Pharmacol

journal_title

Toxicology and applied pharmacology

authors

Greig JB,Francis JE,Kay SJ,Lovell DP,Smith AG

doi

10.1016/0041-008x(84)90265-5

subject

Has Abstract

pub_date

1984-06-15 00:00:00

pages

17-25

issue

1

eissn

0041-008X

issn

1096-0333

pii

0041-008X(84)90265-5

journal_volume

74

pub_type

杂志文章

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