The receptor tyrosine kinase-like orphan receptor 2 (ROR2) is an important player in the complex field of cancer biology. Initial findings suggested it acts as a tumor suppressor, but subsequent studies have demonstrated its potential oncogenic role as well.
1. Role of ROR2 as a Tumor Suppressor
ROR2's tumor-suppressive effects are primarily associated with its capacity to negatively regulate canonical Wnt/β-catenin signalling - a pathway frequently overactivated in various tumors. This is achieved through its interaction with the Wnt5a ligand, activating noncanonical signaling pathways that inhibit canonical Wnt signaling. Moreover, ROR2 can also influence cytoskeletal organization and cellular polarity, thereby preventing the uncontrolled cellular proliferation associated with cancer.
2. ROR2 as an Oncogene
On the contrary, evidence shows ROR2 overexpression in several cancers, like renal, ovarian, and colorectal, among others. In these cases, ROR2 appears to contribute to tumor progression by promoting cell migration, invasion, and EMT (epithelial-mesenchymal transition) - crucial events for metastasis. The molecular mechanisms behind these effects encompass interactions with other signaling molecules like Src and FAK, activation of PI3K/Akt, and crosstalk with Hippo-YAP pathway.
3. Therapeutic Implications
Because of this dual role, targeting ROR2 for cancer therapy presents both opportunities and challenges. On one hand, inhibiting ROR2 could be beneficial in cancers where it's overexpressed and has an oncogenic role. However, such strategies should be approached with caution, considering the potential tumor suppressive functions of ROR2.
Overall, understanding the cellular and molecular mechanisms underlying the paradoxical role of ROR2 in cancer is crucial for the development of effective targeted therapies. Further research is required to comprehensively determine the conditions under which ROR2 acts as a tumor suppressor or an oncogene. |
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