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The Oncogenic Signaling Disruptor, NDRG1: Molecular and Cellular Mechanisms of Activity
Jason Chekmarev1, Mahan Gholam Azad1, Des R Richardson1,2
1Centre for Cancer Cell Biology and Drug Discovery, Griffith Institute for Drug Discovery, Griffith University, Nathan, Brisbane, QLD 4111, Australia.
Abstract:
NDRG1 is an oncogenic signaling disruptor that plays a key role in multiple cancers, including aggressive pancreatic tumors. Recent studies have indicated a role for NDRG1 in the inhibition of multiple tyrosine kinases, including EGFR, c-Met, HER2 and HER3, etc. The mechanism of activity of NDRG1 remains unclear, but to impart some of its functions, NDRG1 binds directly to key effector molecules that play roles in tumor suppression, e.g., MIG6. More recent studies indicate that NDRG1s-inducing drugs, such as novel di-2-pyridylketone thiosemicarbazones, not only inhibit tumor growth and metastasis but also fibrous desmoplasia, which leads to chemotherapeutic resistance. The Casitas B-lineage lymphoma (c-Cbl) protein may be regulated by NDRG1, and is a crucial E3 ligase that regulates various protein tyrosine and receptor tyrosine kinases, primarily via ubiquitination. The c-Cbl protein can act as a tumor suppressor by promoting the degradation of receptor tyrosine kinases. In contrast, c-Cbl can also promote tumor development by acting as a docking protein to mediate the oncogenic c-Met/Crk/JNK and PI3K/AKT pathways. This review hypothesizes that NDRG1 could inhibit the oncogenic function of c-Cbl, which may be another mechanism of its tumor-suppressive effects.
Insights
NDRG1 disrupts oncogenic signaling in cancers like pancreatic tumors. This review hypothesizes NDRG1 inhibits the oncogenic function of c-Cbl, a key E3 ligase, potentially revealing new tumor-suppressive mechanisms.
Area of Science:
- Oncology
- Molecular Biology
- Biochemistry
Background:
- NDRG1 is an oncogenic signaling disruptor implicated in various cancers, notably aggressive pancreatic tumors.
- NDRG1 inhibits multiple tyrosine kinases (e.g., EGFR, c-Met, HER2, HER3) and interacts with tumor suppressors like MIG6.
- NDRG1-inducing drugs show potential in inhibiting tumor growth, metastasis, and desmoplasia, overcoming chemotherapeutic resistance.
Purpose of the Study:
- To explore the unclear mechanism of NDRG1's activity in cancer.
- To investigate the potential role of NDRG1 in regulating the Casitas B-lineage lymphoma (c-Cbl) protein.
- To hypothesize how NDRG1 might inhibit the oncogenic functions of c-Cbl as a tumor-suppressive mechanism.
Main Methods:
- Literature review of studies on NDRG1, tyrosine kinases, and c-Cbl.
- Analysis of NDRG1's interactions with effector molecules.
- Examination of c-Cbl's dual role as a tumor suppressor and promoter.
Main Results:
- NDRG1 directly binds to effector molecules, contributing to tumor suppression.
- NDRG1 may regulate c-Cbl, an E3 ligase critical for tyrosine kinase ubiquitination and degradation.
- c-Cbl can act as a tumor suppressor or promoter depending on its interactions.
Conclusions:
- NDRG1's interaction with c-Cbl is a potential mechanism for its tumor-suppressive effects.
- Understanding NDRG1-c-Cbl interaction could lead to novel therapeutic strategies for cancer treatment.
- Further research is warranted to elucidate the precise molecular interplay between NDRG1 and c-Cbl.
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