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High-density lipoproteins decrease both binding of a polynuclear aromatic hydrocarbon carcinogen to DNA and
Mutation Research
|November 1, 1983
Summary
High-density lipoproteins in cell culture media can reduce carcinogen exposure by binding lipophilic mutagens. This binding decreases the amount of carcinogen available to interact with cellular DNA, lowering cell transformation rates.
Area of Science:
- Biochemistry
- Cell Biology
- Toxicology
Background:
- Lipophilic carcinogens, such as benzo[a]pyrene and methylcholanthrene, are environmental mutagens.
- Serum lipoproteins, including high-density lipoproteins (HDL), are present in cell culture media.
- Lipoprotein concentrations can vary significantly between different serum lots.
Purpose of the Study:
- To investigate the role of serum lipoproteins in modulating the cellular effects of lipophilic carcinogens.
- To determine if high-density lipoproteins influence the interaction of carcinogens with cellular DNA and subsequent cell transformation.
Main Methods:
- Cell culture experiments using C3H/10T1/2 mouse embryo cells.
- Exposure of cells to benzo[a]pyrene and methylcholanthrene in media supplemented with varying concentrations of lipoproteins.
- Analysis of carcinogen-DNA adducts and cell transformation frequencies.
Main Results:
- High-density lipoproteins reduced the binding of a benzo[a]pyrene metabolite to cellular DNA.
- Cellular transformation induced by methylcholanthrene was less efficient in the presence of high concentrations of HDL.
- Supplementation of fetal calf serum with concentrated lipoproteins or purified HDL decreased methylcholanthrene-induced cell transformation.
Conclusions:
- High-density lipoproteins can sequester lipophilic carcinogens from the cell culture medium.
- This sequestration reduces the availability of carcinogens for interaction with cellular DNA.
- HDL-mediated partitioning may be a protective mechanism against carcinogen-induced cellular transformation in vitro.