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Ref Type Journal Article
PMID (25477533)
Authors Liyasova MS, Ma K, Lipkowitz S
Title Molecular pathways: cbl proteins in tumorigenesis and antitumor immunity-opportunities for cancer treatment.
Journal Clinical cancer research : an official journal of the American Association for
Vol 21
Issue 8
Date 2015 Apr 15
URL
Abstract Text The Cbl proteins are a family of ubiquitin ligases (E3s) that regulate signaling through many tyrosine kinase-dependent pathways. A predominant function is to negatively regulate receptor tyrosine kinase (RTK) signaling by ubiquitination of active RTKs, targeting them for trafficking to the lysosome for degradation. Also, Cbl-mediated ubiquitination can regulate signaling protein function by altered cellular localization of proteins without degradation. In addition to their role as E3s, Cbl proteins play a positive role in signaling by acting as adaptor proteins that can recruit signaling molecules to the active RTKs. Cbl-b, a second family member, negatively regulates the costimulatory pathway of CD8 T cells and also negatively regulates natural killer cell function. The different functions of Cbl proteins and their roles both in the development of cancer and the regulation of immune responses provide multiple therapeutic opportunities. Mutations in Cbl that inactivate the negative E3 function while maintaining the positive adaptor function have been described in approximately 5% of myeloid neoplasms. An improved understanding of how the signaling pathways [e.g., Fms-like tyrosine kinase 3 (Flt3), PI3K, and signal transducer and activator of transcription (Stat)] are dysregulated by these mutations in Cbl has helped to identify potential targets for therapy of myeloid neoplasms. Conversely, the loss of Cbl-b leads to increased adaptive and innate antitumor immunity, suggesting that inhibiting Cbl-b may be a means to increase antitumor immunity across a wide variety of tumors. Thus, targeting the pathways regulated by Cbl proteins may provide attractive opportunities for treating cancer.

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Gene Name Source Synonyms Protein Domains Gene Description Gene Role
CBL NCBI C-CBL|CBL2|FRA11B|NSLL|RNF55 CBL, Cbl proto-oncogene C, is an E3 ubiquitin-protein ligase involved in cell signaling and ubiquitination of tyrosine kinases (PMID: 23085373). CBL mutations, often resulting in a loss of function, have been identified primarily in myeloid neoplasms, including myelodysplastic syndrome, acute myeloid leukemia, chronic myeloid leukemia, myelofibrosis, and juvenile myelomonocytic leukemia (PMID: 25477533). Both: Oncogene and Tumor suppressor
CBLB NCBI Cbl-b|Nbla00127|RNF56 CBLB, Cbl proto-oncogene B, is an E3 ubiquitin ligase that negatively regulates receptor tyrosine kinase signaling through targeted degradation of active kinases, and is a key regulator of the immune system (PMID: 25477533, PMID: 30442330). CBLB mutations have been observed in myeloid neoplasms, and loss of CBLB in mouse models results in increased anti-tumor immunity (PMID: 19901108, PMID: 25477533). Tumor suppressor
Therapy Name Drugs Efficacy Evidence Clinical Trials
Drug Name Trade Name Synonyms Drug Classes Drug Description
Gene Variant Impact Protein Effect Variant Description Associated with drug Resistance
Molecular Profile Indication/Tumor Type Response Type Therapy Name Approval Status Evidence Type Efficacy Evidence References