Abstract
ABSTRACTWilms tumor is the most common kidney cancer in children, and diffusely anaplastic Wilms tumor is the most chemoresistant histological subtype. Here we explore how Wilms tumor cells evade the common chemotherapeutic drug actinomycin D, which inhibits ribosomal RNA biogenesis. Using ribosome profiling, protein arrays, and a genome-wide knockout screen, we describe how actinomycin D disrupts protein homeostasis and blocks cell cycle progression. We found that, when ribosomal capacity is limited by actinomycin D treatment, anaplastic Wilms tumor cells preferentially translate proteasome components and upregulate proteasome activity. Furthermore, the proteasome inhibitor bortezomib sensitizes cells to actinomycin D treatment by inducing apoptosis bothin vitroandin vivo. Lastly, we show that increased levels of proteasome components are associated with anaplastic histology and with worse prognosis in non-anaplastic Wilms tumor. In sum, maintaining protein homeostasis is critical for Wilms tumor proliferation, and it can be therapeutically disrupted by blocking protein synthesis or turnover.
Publisher
Cold Spring Harbor Laboratory
Reference101 articles.
1. Howlader N, N. A. , Krapcho M , Miller D , Brest A , Yu M , Ruhl J , Tatalovich Z , Mariotto A , Lewis DR , Chen HS , Feuer EJ , Cronin KA (eds). SEER Cancer Statistics Review, 1975-2018, National Cancer Institute, (2018).
2. Twenty-five year follow-up of childhood Wilms tumor: A report from the Childhood Cancer Survivor Study
3. Results of the First Prospective Multi-institutional Treatment Study in Children With Bilateral Wilms Tumor (AREN0534)
4. Prognostic Factors for Wilms Tumor Recurrence: A Review of the Literature
5. Unmet needs for relapsed or refractory Wilms tumour: Mapping the molecular features, exploring organoids and designing early phase trials – A collaborative SIOP-RTSG, COG and ITCC session at the first SIOPE meeting