Developmental onset of mixed-function oxidase activity in preimplantation mouse embryos

Journal Article · Sun Nov 01 00:00:00 EST 1981 · Proc. Natl. Acad. Sci. U.S.A.; (United States)

DOI:https://doi.org/10.1073/pnas.78.11.6991· OSTI ID:5630169

Filler, R ^[1]; Lew, K J

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1. Oak Ridge National Lab., TN

Two-cell embryos, obtained from the C57BL/6N and DBA/2N strains, were cultured in media that supported in vitro differentiation and that contained (/sup 3/H)benzo(a)pyrene. High-pressure liquid chromatography of the activated intermediates formed during in vitro early embryonic development indicated that the onset of polynuclear aromatic hydrocarbon activation coincided with blastocyst formation. Comparison of individual oxygenated intermediates metabolically formed from embryos genetically ''responsive'' or ''nonresponsive'' to aromatic hydrocarbons revealed significant quantitative differences in the production of dihydrodiol, quinone, and phenolic derivatives. In addition to exhibiting basal mixed-function oxidase activity, blastocysts were also responsive to enzymatic induction when exposed to 2,3,7,8-tetrachlorodibenzo-p-dioxin. The presence of operative metabolite-detoxifying pathways was also assayed. Enzymatic treatment of water-soluble metabolites with ..beta..-glucuronidase or arylsulfatase revealed that neither glucuronic acid conjugates nor sulfate ester derivatives were present. These data, therefore, provide direct evidence that late preimplanation mouse embryos (day 3 1/2 of gestation) are similar to later developmental stages in having the enzymatic capability for xenobiotic activation and enzyme induction but are dissimilar with respect to their detoxification mechanisms(s). Moreover, the ability of preimplantation embryos to activate directly polynuclear aromatic hydrocarbon to bioreactive intermediates may be of importance in assessing the ontological susceptibility of the developing embryo to carcinogenic or teratogenic chemicals.

• DOE Contract Number: W-7405-ENG-26
• OSTI ID: 5630169
• Journal Information: Proc. Natl. Acad. Sci. U.S.A.; (United States), Vol. 78:11
• Country of Publication: United States
• Language: English

Related Subjects

59 BASIC BIOLOGICAL SCIENCES
AROMATICS
CARCINOGENESIS
EMBRYOS
ENZYME ACTIVITY
BIOLOGICAL EFFECTS
LIQUID COLUMN CHROMATOGRAPHY
MICE
TRITIUM COMPOUNDS
ANIMALS
CHROMATOGRAPHY
LABELLED COMPOUNDS
MAMMALS
ORGANIC COMPOUNDS
PATHOGENESIS
RODENTS
SEPARATION PROCESSES
VERTEBRATES
550901* - Pathology- Tracer Techniques