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Germ cell responses to doxorubicin exposure in vitro
Khaled Habas1, Diana Anderson1, Martin H Brinkworth1
1School of Medical Sciences, Faculty of Life Sciences, University of Bradford, Bradford, Richmond Road, West Yorkshire, BD7 1DP, UK.
Abstract:
Anthracyclines such as doxorubicin (Dox), widely used to treat various types of tumours, may result in induced testicular toxicity and oxidative stress. The present investigation was designed to determine whether exposure of isolated and purified mouse germ cells to Dox induces DNA damage in the form of strand breaks (presumably) resulting in apoptosis and to investigate the relative sensitivity of specific cell types. DNA damage was assessed using the Comet assay and the presence of apoptosis was determined by TUNEL assay. Isolated mouse germ cells were treated with different concentrations (0.05, 0.5 and 1mM, respectively) of Dox, and fixed 1h after treatment. The incidences of both DNA damage shown by single cell gel-electrophoresis and of apoptosis increased significantly in each specific cell type in a concentration-dependent manner. The DNA damage and apoptosis incidences gradually increased with concentration from 0.05 to 1mM with Dox. Our results indicate that apoptosis plays a vital role in the induction of germ cell phase-specific toxicity caused by Dox with pre-meiotically and meiotically dividing spermatogonia and spermatocytes respectively as highly susceptible target cells.
Insights
Doxorubicin (Dox) causes DNA damage and apoptosis in mouse germ cells. Pre-meiotic spermatogonia and meiotic spermatocytes are highly susceptible to this chemotherapy-induced testicular toxicity.
Area of Science:
- Reproductive toxicology
- Cancer chemotherapy
- Molecular biology
Background:
- Anthracyclines like doxorubicin (Dox) are vital in cancer treatment.
- Doxorubicin is known to induce testicular toxicity and oxidative stress.
- Understanding germ cell sensitivity to Dox is crucial for fertility preservation.
Purpose of the Study:
- To investigate if doxorubicin induces DNA damage and apoptosis in mouse germ cells.
- To determine the concentration-dependent effects of doxorubicin on germ cells.
- To identify the most susceptible germ cell types to doxorubicin toxicity.
Main Methods:
- Isolated mouse germ cells were exposed to varying concentrations of doxorubicin (0.05, 0.5, 1mM).
- DNA damage was quantified using the Comet assay (single cell gel electrophoresis).
- Apoptosis was assessed via TUNEL assay.
Main Results:
- Doxorubicin exposure significantly increased DNA damage and apoptosis in germ cells.
- The incidences of DNA damage and apoptosis showed a concentration-dependent increase with doxorubicin.
- Pre-meiotic spermatogonia and meiotic spermatocytes exhibited high susceptibility to doxorubicin.
Conclusions:
- Apoptosis is a key mechanism in doxorubicin-induced testicular toxicity.
- Germ cell toxicity from doxorubicin is phase-specific.
- Spermatogonia and spermatocytes are particularly vulnerable to doxorubicin treatment.
