The G protein-coupled receptor GPRC5A—a phorbol ester and retinoic acid-induced orphan receptor with roles in cancer, inflammation, and immunity

Author:

Iglesias González Pablo A.1,Valdivieso Ángel G.1,Santa-Coloma Tomás A.1ORCID

Affiliation:

1. Laboratory of Cell and Molecular Biology, Institute for Biomedical Research (BIOMED), National Scientific and Technical Research Council (CONICET), Pontifical Catholic University of Argentina (UCA), Argentina

Abstract

GPRC5A is the first member of a new class of orphan receptors coupled to G proteins, which also includes GPRC5B, GPRC5C, and GPRC5D. Since its cloning and identification in the 1990s, substantial progress has been made in understanding the possible functions of this receptor. GPRC5A has been implicated in a variety of cellular events, such as cytoskeleton reorganization, cell proliferation, cell cycle regulation, migration, and survival. It appears to be a central player in different pathological processes, including tumorigenesis, inflammation, immune response, and tissue damage. The levels of GPRC5A expression differ depending on the type of cancer, with increased expression in colon, pancreas, and prostate cancers; decreased expression in lung cancer; and varied results in breast cancer. In this review, we discuss the early discovery of GPRC5A as a phorbol ester-induced gene and later as a retinoic acid-induced gene, its regulation, and its participation in important canonical pathways related to numerous types of tumors and inflammatory processes. GPRC5A represents a potential new target for cancer, inflammation, and immunity therapies.

Publisher

Canadian Science Publishing

Subject

Cell Biology,Molecular Biology,Biochemistry

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