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Published on: June 6, 2025
Axl-dependent signalling: a clinical update
1Department of Medicine, Aab Cardiovascular Research Institute, University of Rochester School of Medicine and Dentistry, Rochester, NY 14642, USA. Slava_Korshunov@URMC.rochester.edu
Abstract:
Axl is a receptor tyrosine kinase that was originally cloned from cancer cells. Axl belongs to the TAM (Tyro3, Axl and Mertk) family of receptor tyrosine kinases. Gas6 (growth-arrest-specific protein 6) is a ligand for Axl. Activation of Axl protects cells from apoptosis, and increases migration, aggregation and growth through multiple downstream pathways. Up-regulation of the Gas6/Axl pathway is more evident in pathological conditions compared with normal physiology. Recent advances in Axl receptor biology are summarized in the present review. The emphasis is given to translational aspects of Axl-dependent signalling under pathological conditions. In particular, inhibition of Axl reduces tumorigenesis and prevents metastasis as well. Axl-dependent signals are important for the progression of cardiovascular diseases. In contrast, deficiency of Axl in innate immune cells contributes to the pathogenesis of autoimmune disorders. Current challenges in Axl biology are related to the functional interactions of Axl with other members of the TAM family or other tyrosine kinases, mechanisms of ligand-independent activation, inactivation of the receptor and cell-cell interactions (with respect to immune cells) in chronic diseases.
Insights
The Gas6/Axl pathway, a receptor tyrosine kinase, is upregulated in diseases, promoting cancer and cardiovascular issues. Inhibiting Axl can reduce tumor growth and metastasis.
Area of Science:
- Molecular Biology
- Cell Biology
- Oncology
Background:
- Axl receptor tyrosine kinase, part of the TAM family, binds to Gas6.
- Axl activation promotes cell survival, migration, and growth via downstream pathways.
- The Gas6/Axl pathway is more active in pathological states than in normal physiology.
Purpose of the Study:
- To review recent advances in Axl receptor biology.
- To focus on the translational aspects of Axl signaling in diseases.
- To highlight Axl's role in cancer, cardiovascular diseases, and autoimmune disorders.
Main Methods:
- Review of current literature on Axl receptor biology.
- Analysis of Axl's downstream signaling pathways.
- Examination of Axl's role in various pathological conditions.
Main Results:
- Axl inhibition reduces tumorigenesis and metastasis.
- Axl signaling contributes to cardiovascular disease progression.
- Axl deficiency in immune cells exacerbates autoimmune disorders.
Conclusions:
- Axl receptor tyrosine kinase is a significant factor in various diseases.
- Targeting Axl offers therapeutic potential for cancer and other conditions.
- Further research is needed on Axl interactions and activation mechanisms in chronic diseases.
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