Adhesion G protein-coupled receptor G3 (ADGRG3) is a protein that in humans is encoded by the ADGRG3gene (previously GPR97). ADGRG3 is a member of the adhesion GPCR family.
Adhesion GPCRs are characterized by an extended extracellular region often possessing N-terminal protein modules that is linked to a TM7 region via a domain known as the GPCR-Autoproteolysis INducing (GAIN) domain.
ADGRG3 is expressed in human granulocytes and endothelial cells of the vasculature as well as in mouse granulocytes, monocytes, macrophages, and dendritic cells.
Signaling
The inositol phosphate (IP3) accumulation, aequorin, and 35S isotope binding assays in overexpressing HEK293 cells have demonstrated coupling of ADGRG3 to Gαo protein triggering cyclic adenosine monophosphate (cAMP). GPR97 actives cAMP response element-binding protein (CREB), NF-κB, and small GTPases to regulate cellular functions.
Function
Systemic steroid exposure is a therapy to treat a variety of medical conditions and is associated with epigenetic processes such as DNA methylation that may reflect pharmacological responses and/or side effects. ADGRG3 was found to be differently methylated at CpG sites in the genome of blood cells from patient under systemic steroid treatment. ADGRG3 is transcribed in immune cells. Gene-deficient mice revealed that Adgrg3 is crucial for maintaining B-cell population via constitutive CREB and NF-κB activities. Human lymphatic endothelial cells (LECs) abundantly express ADGRG3. Silencing ADGRG3 in human LECs indicated that ADGRG3 modulates cytoskeletal rearrangement, cell adhesion and migration through regulating the small GTPase RhoA and cdc42. In vertebrates, ADGRG3 has an indispensable role in the bone morphogenetic proteins (BMP) signaling pathway in bone formation. A microarray meta-analysis revealed that mouse ADGRG3 is a direct transcriptional target of BMP signaling in long bone development.
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↑Stacey M, Yona S (2011). Adhesion-GPCRs: Structure to Function (Advances in Experimental Medicine and Biology). Berlin: Springer. ISBN978-1-4419-7912-4.
↑Langenhan T, Aust G, Hamann J (May 2013). "Sticky signaling--adhesion class G protein-coupled receptors take the stage". Science Signaling. 6 (276): re3. doi:10.1126/scisignal.2003825. PMID23695165. S2CID6958640.