The TAM family: phosphatidylserine-sensing receptor tyrosine kinases gone awry in cancer

DK Graham, D DeRyckere, KD Davies… - Nature Reviews Cancer, 2014 - nature.com
DK Graham, D DeRyckere, KD Davies, HS Earp
Nature Reviews Cancer, 2014nature.com
The TYRO3, AXL (also known as UFO) and MERTK (TAM) family of receptor tyrosine
kinases (RTKs) are aberrantly expressed in multiple haematological and epithelial
malignancies. Rather than functioning as oncogenic drivers, their induction in tumour cells
predominately promotes survival, chemoresistance and motility. The unique mode of
maximal activation of this RTK family requires an extracellular lipid–protein complex. For
example, the protein ligand, growth arrest-specific protein 6 (GAS6), binds to …
Abstract
The TYRO3, AXL (also known as UFO) and MERTK (TAM) family of receptor tyrosine kinases (RTKs) are aberrantly expressed in multiple haematological and epithelial malignancies. Rather than functioning as oncogenic drivers, their induction in tumour cells predominately promotes survival, chemoresistance and motility. The unique mode of maximal activation of this RTK family requires an extracellular lipid–protein complex. For example, the protein ligand, growth arrest-specific protein 6 (GAS6), binds to phosphatidylserine (PtdSer) that is externalized on apoptotic cell membranes, which activates MERTK on macrophages. This triggers engulfment of apoptotic material and subsequent anti-inflammatory macrophage polarization. In tumours, autocrine and paracrine ligands and apoptotic cells are abundant, which provide a survival signal to the tumour cell and favour an anti-inflammatory, immunosuppressive microenvironment. Thus, TAM kinase inhibition could stimulate antitumour immunity, reduce tumour cell survival, enhance chemosensitivity and diminish metastatic potential.
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