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AXL Receptor Tyrosine Kinase as a Therapeutic Target in Hematological Malignancies: Focus on Multiple Myeloma
Siyang Yan1,2, Niels Vandewalle1, Nathan De Beule1
1Department of Hematology and Immunology, Myeloma Center Brussels, Vrije Universiteit Brussel, 1090 Brussel, Belgium.
Abstract:
AXL belongs to the TAM (TYRO3, AXL, and MERTK) receptor family, a unique subfamily of the receptor tyrosine kinases. Their common ligand is growth arrest-specific protein 6 (GAS6). The GAS6/TAM signaling pathway regulates many important cell processes and plays an essential role in immunity, hemostasis, and erythropoiesis. In cancer, AXL overexpression and activation has been associated with cell proliferation, chemotherapy resistance, tumor angiogenesis, invasion, and metastasis; and has been correlated with a poor prognosis. In hematological malignancies, the expression and function of AXL is highly diverse, not only between the different tumor types but also in the surrounding tumor microenvironment. Most research and clinical evidence has been provided for AXL inhibitors in acute myeloid leukemia. However, recent studies also revealed an important role of AXL in lymphoid leukemia, lymphoma, and multiple myeloma. In this review, we summarize the basic functions of AXL in various cell types and the role of AXL in different hematological cancers, with a focus on AXL in the dormancy of multiple myeloma. In addition, we provide an update on the most promising AXL inhibitors currently in preclinical/clinical evaluation and discuss future perspectives in this emerging field.
Insights
AXL receptor tyrosine kinase signaling is crucial in cancer, particularly hematological malignancies. This review highlights AXL
Area of Science:
- Oncology
- Molecular Biology
- Hematology
Background:
- AXL receptor tyrosine kinase is part of the TAM family, interacting with GAS6.
- The GAS6/TAM pathway influences cell processes, immunity, and hemostasis.
- AXL overexpression in cancer correlates with poor prognosis, proliferation, and metastasis.
Purpose of the Study:
- To review AXL's function in various cell types.
- To examine AXL's role in hematological cancers, focusing on multiple myeloma dormancy.
- To update on AXL inhibitors in clinical development.
Main Methods:
- Literature review of AXL's role in cell biology and hematological malignancies.
- Analysis of preclinical and clinical data on AXL inhibitors.
- Synthesis of current research on AXL in multiple myeloma dormancy.
Main Results:
- AXL's diverse expression and function in hematological malignancies and their microenvironments.
- Significant research on AXL inhibitors in acute myeloid leukemia.
- Emerging evidence for AXL's role in lymphoid leukemia, lymphoma, and multiple myeloma.
Conclusions:
- AXL is a significant factor in hematological cancers, including multiple myeloma dormancy.
- Targeting AXL presents a promising therapeutic strategy.
- Further research and clinical evaluation of AXL inhibitors are warranted.
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