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Published on: February 12, 2018
Bortezomib treatment causes long-term testicular dysfunction in young male mice
Mi Hou1, Emma Eriksson, Konstantin Svechnikov
1Department of Women's and Children's Health, Astrid Lindgren Children's Hospital, Pediatric Endocrinology Unit Q2:08, Karolinska Institutet & University Hospital, SE-171 76 Stockholm, Sweden. Mi.Hou@ki.se.
Background:
With increased long-term survivors of childhood cancer patients, therapy-associated infertility has become one of the most common late side-effects and significantly affects their life-quality. Therefore, evaluation of anti-cancer agents on male reproduction and infertility prevention are urgently demanding. The proteasome inhibitor bortezomib has been launched in clinical trials for childhood cancers, however, its potential side effects on reproduction have so far been neither investigated experimentally nor reported in treated children. Thus the present study is designed to explore the impact of bortezomib on male reproductive function and to gain insights into how bortezomib exerts its adverse effects on man gonad, thereby providing pediatric oncologists relevant information.
Methods:
35 day-old male mice were treated with one 11-day cycle of bortezomib and then sacrificed 2 days, 45 days, or 6 months later. A mating study was performed in the group followed for 6 months, and their pups were analyzed on postnatal day 50. Serum follicle-stimulating hormone (FSH) and testicular testosterone levels were measured. Testicular morphology was evaluated by light- and electron microscopy, and the underlying mechanisms and pathways of testis damage were investigated.
Results:
Testicular damage was visible already 2 days after stopping bortezomib and increased in severity by day 45. Then 80% of seminiferous tubules exhibited hypospermatogenesis with arrest at the levels of spermatogonia, spermatocytes and round spermatids. Germ cells were specifically targeted by bortezomib as evidenced by increased apoptosis mediated through activation of p53 and caspases. Even six months after the bortezomib treatment, testis weight, sperm concentration and seminiferous tubule length remained at a decreased level, indicating that spermatogenesis and tubular outgrowth could not fully recover. Combined with persistently increased serum levels of FSH in these mice, our results demonstrate that bortezomib can have long-term effects on testicular function, although fertility of bortezomib-exposed males remained and their offspring looked healthy.
Conclusion:
Bortezomib treatment causes long-term gonadal dysfunction in male mice. Careful monitoring of gonadal function in male childhood cancer patients treated with bortezomib is thus strongly recommended.
Insights
Bortezomib, a cancer drug, causes long-term testicular damage and dysfunction in male mice, impacting sperm production and hormone levels. Monitoring male cancer patients treated with this drug is crucial for fertility preservation.
Area of Science:
- Reproductive toxicology
- Pediatric oncology
- Cancer drug side effects
Background:
- Therapy-associated infertility is a significant concern for childhood cancer survivors.
- Bortezomib, a proteasome inhibitor used in childhood cancer trials, has unknown reproductive side effects.
- This study investigates bortezomib's impact on male reproductive function.
Purpose of the Study:
- To explore bortezomib's effects on male reproductive function.
- To understand the mechanisms of bortezomib-induced testicular damage.
- To provide essential information for pediatric oncologists regarding male fertility preservation.
Main Methods:
- Male mice were treated with bortezomib over 11 days.
- Evaluations were conducted at 2 days, 45 days, and 6 months post-treatment.
- Fertility assessments, hormone level measurements, and detailed testicular histology were performed.
Main Results:
- Bortezomib induced significant testicular damage and hypospermatogenesis, affecting germ cell development.
- Apoptosis in germ cells was mediated by p53 and caspase activation.
- Long-term effects included reduced testis weight, sperm concentration, and impaired spermatogenesis, with elevated FSH levels.
Conclusions:
- Bortezomib causes persistent gonadal dysfunction in male mice.
- The findings highlight the need for careful monitoring of testicular function in male childhood cancer patients undergoing bortezomib treatment.
