Pediatric cancers represent an understudied area in oncology. The great majority of cancer research is dedicated to understanding adult malignancies, such as cancers of the breast, colon, lung and skin. However, pediatric cancers most commonly arise in distinct tissues, such as brain, bone, and blood. The biological landscape of such developing tissues is believed to confer a distinct susceptibility to oncogenic insults, but our understanding of the molecular basis of this phenomenon is still in its infancy. This application focuses on a novel agent implicated in the etiology of several bone and soft tissue tumors (BSTTs), a class of tumors that preferentially targets children and adolescents. TRE17 translocation occurs in two distinct BSTTs, aneurysmal bone cyst (ABC) and nodular fasciitis (NF), leading to its high level expression. Our screening of a wide panel of primary human tumors further revealed high expression specifically in a high percentage of alveolar rhabdomyosarcoma (ARMS) cases. Rhabdomyosarcoma is the most common pediatric soft tissue sarcoma;of the various subtypes, ARMS carries the worst prognosis. My research is aimed at elucidating the pathogenic mechanisms of TRE17. Our recent work focusing on its functions in the context of ABC revealed that it functions cell-autonomously to promote tumor cell proliferation/survival, but also regulates the tumor microenvironment by inducing the production of multiple cytokines, chemokines, and growth factors, in a manner strictly dependent on its USP activity. We further identified NF?B and STAT3 as key effectors of TRE17 in ABC pathogenesis. Both of these transcription factors are widely dysregulated in cancer, often coordinately, where they function pleiotropically to promote multiple aspects of tumor growth and metastasis. We hypothesize that TRE17 plays a key role in ARMS pathogenesis, and that NF?B and STAT3 function as critical effectors. This proposal will determine the requirement of these three factors both in vitro and in vivo. In vitro analyses will assess their rle in cell proliferation, survival, and cytokine/growth factor production, and will include examining their role within the cancer cell stem (CSC) subpopulation, which has been reported to be dependent on NF?B and STAT3 in other cancers. In vivo studies will examine their role in tumor formation, tumor maintenance, and metastasis. If successful, these studies would provide three novel targets for therapeutic intervention in ARMS. Notably, inhibitors for NF?B and STAT3 pathways are already being avidly developed for other cancers and immune disorders. Furthermore, TRE17-specific USP inhibitors might function as effective therapeutic agents for not only ARMS, but also other BSTTs driven by TRE17 overexpression. USP inhibitors are particularly appealing since TRE17 exhibits such limited expression, minimizing the likelihood of side effects.

Public Health Relevance

Rhabdomyosarcoma is the most common pediatric soft tissue sarcoma, and among the various subtypes, alveolar rhabdomyosarcoma (ARMS) is particularly lethal, with ~20% survival for metastatic cases. Despite advances in our understanding of the molecular and cellular anomalies in ARMS, this has not translated into new therapies. This, identification of novel pathways and alternative strategies for targeting them are sorely needed.

Agency
National Institute of Health (NIH)
Institute
National Cancer Institute (NCI)
Type
Exploratory/Developmental Grants (R21)
Project #
1R21CA178601-01
Application #
8570230
Study Section
Special Emphasis Panel (ZCA1-SRLB-1 (M2))
Program Officer
Yassin, Rihab R,
Project Start
2013-07-01
Project End
2015-06-30
Budget Start
2013-07-01
Budget End
2014-06-30
Support Year
1
Fiscal Year
2013
Total Cost
$218,588
Indirect Cost
$88,088
Name
Children's Hospital of Philadelphia
Department
Type
DUNS #
073757627
City
Philadelphia
State
PA
Country
United States
Zip Code
19104
Henrich, Ian C; Young, Robert; Quick, Laura et al. (2018) USP6 Confers Sensitivity to IFN-Mediated Apoptosis through Modulation of TRAIL Signaling in Ewing Sarcoma. Mol Cancer Res 16:1834-1843
Madan, Babita; Walker, Matthew P; Young, Robert et al. (2016) USP6 oncogene promotes Wnt signaling by deubiquitylating Frizzleds. Proc Natl Acad Sci U S A 113:E2945-54
Quick, Laura; Young, Robert; Henrich, Ian C et al. (2016) Jak1-STAT3 Signals Are Essential Effectors of the USP6/TRE17 Oncogene in Tumorigenesis. Cancer Res 76:5337-47