Bleomycin: female-specific dominant lethal effects in mice
P D Sudman1, J C Rutledge, J B Bishop
1Biology Division, Oak Ridge National Laboratory, TN 37831-8077, USA.
Abstract:
Limited comparative data in mice indicate that chemical mutagens that induce dominant lethal mutations in males are not necessarily effective in females, but those which are effective in females are generally equally or more effective in males. Recently, however, a few chemicals have been identified that are female-specific with respect to induction of dominant lethal mutations. The antitumor antibiotic adriamycin is among them. Another antitumor antibiotic, bleomycin was examined for its ability to induce dominant lethal mutations in the reproductive cells of male and female mice. No dominant lethal or cytotoxic effects were observed in males treated with bleomycin, even at a maximum tolerated dose. In females, on the other hand, a dose nearly 1/4 of that used in males induced not only a high level of dominant lethal mutations but also killed oocytes in certain stages of follicular development. The effectiveness of bleomycin in inducing dominant lethal mutations in mouse oocytes makes it a valuable tool for investigating whether gonadal transport, inherent differences in the configuration of chromatin in the germ cells of the two sexes or other factors are responsible for the differential susceptibility to bleomycin, which implies potential gender-specific genetic risk in cancer chemotherapy.
Insights
Bleomycin, an antitumor antibiotic, induces dominant lethal mutations in female mice but not males. This gender-specific genetic risk highlights potential differences in cancer chemotherapy safety.
Area of Science:
- Toxicology
- Genetics
- Pharmacology
Background:
- Chemical mutagens exhibit variable efficacy in inducing dominant lethal mutations between male and female mice.
- Adriamycin is a known female-specific mutagen, prompting investigation into other antitumor antibiotics.
- Understanding gender-specific genetic risks from chemotherapy is crucial.
Purpose of the Study:
- To evaluate the potential of bleomycin to induce dominant lethal mutations in male and female mice.
- To investigate the gender-specific effects of bleomycin on reproductive cells.
- To explore factors contributing to differential susceptibility to bleomycin.
Main Methods:
- Mice were treated with varying doses of bleomycin.
- Dominant lethal mutations and cytotoxic effects were assessed in reproductive cells of both sexes.
- Dose-response relationships were analyzed.
Main Results:
- Bleomycin induced no dominant lethal or cytotoxic effects in male mice, even at maximum tolerated doses.
- In female mice, a lower dose of bleomycin induced significant dominant lethal mutations.
- Bleomycin also caused oocyte death in specific follicular development stages in females.
Conclusions:
- Bleomycin demonstrates female-specific induction of dominant lethal mutations in mice.
- This finding suggests potential gender-specific genetic risks associated with bleomycin chemotherapy.
- Further research is needed to elucidate the mechanisms behind this differential susceptibility.
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