Adhesion G Protein-coupled Receptors pp 369-396 | Cite as
Adhesion GPCRs in Tumorigenesis
Graphical Abstract
Abstract
Alterations in the homeostasis of several adhesion GPCRs (aGPCRs) have been observed in cancer. The main cellular functions regulated by aGPCRs are cell adhesion, migration, polarity, and guidance, which are all highly relevant to tumor cell biology. Expression of aGPCRs can be induced, increased, decreased, or silenced in the tumor or in stromal cells of the tumor microenvironment, including fibroblasts and endothelial and/or immune cells. For example, ADGRE5 (CD97) and ADGRG1 (GPR56) show increased expression in many cancers, and initial functional studies suggest that both are relevant for tumor cell migration and invasion. aGPCRs can also impact the regulation of angiogenesis by releasing soluble fragments following the cleavage of their extracellular domain (ECD) at the conserved GPCR-proteolytic site (GPS) or other more distal cleavage sites as typical for the ADGRB (BAI) family. Interrogation of in silico cancer databases suggests alterations in other aGPCR members and provides the impetus for further exploration of their potential role in cancer. Integration of knowledge on the expression, regulation, and function of aGPCRs in tumorigenesis is currently spurring the first preclinical studies to examine the potential of aGPCR or the related pathways as therapeutic targets.
Keywords
Tumor cell migration Tumor invasion Metastasis Tumor angiogenesis Tumor therapyAbbreviations
- CCLE
Cancer Cell Line Encyclopedia
- CTF
C-terminal fragment
- ECD
Extracellular domain
- ECM
Extracellular matrix
- GAIN
GPCR autoproteolysis inducing
- GPS
GPCR-proteolytic site
- NTF
N-terminal fragment
- TG2
Tissue transglutaminase
- TSR
Thrombospondin repeat
Notes
Acknowledgments
G.A. was supported by grants of the German Research Foundation (AU 132/7-3; FOR2149 Project 8 AU 132/8-1), L.X. by the National Institute of General Medicine Sciences (NIGMS; grant R01GM098591), D.Z. and E.G.V.M. in part by the US National Cancer Institute (grants CA086335 and NS096236), and the Southeastern Brain Tumor, Cure Childhood Cancer, and St. Baldrick’s Foundations.
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