The C5a receptor also known as complement component 5a receptor 1 (C5AR1) or CD88 (Cluster of Differentiation 88) is a G protein-coupled receptor for C5a. It functions as a complement receptor.[5] C5a receptor 1 modulates inflammatory responses, obesity, development and cancers.[6][7][8] From a signaling transduction perspective, C5a receptor 1 activation is implicated in β-arrestin2 recruitment via Rab5a,[9] coupling of Gαi proteins,[10] ERK1/2 phosphorylation, [11] calcium mobilization and Rho activation[12] leading to downstream functions, such as secretion of cytokines, chemotaxis, and phagocytosis.
^Li XX, Lee JD, Massey NL, Guan C, Robertson AA, Clark RJ, et al. (October 2020). "Pharmacological characterisation of small molecule C5aR1 inhibitors in human cells reveals biased activities for signalling and function". Biochemical Pharmacology. 180: 114156. doi:10.1016/j.bcp.2020.114156. PMID32682759. S2CID220653568.
^Gorman DM, Li XX, Lee JD, Fung JN, Cui CS, Lee HS, et al. (November 2021). "Development of Potent and Selective Agonists for Complement C5a Receptor 1 with In Vivo Activity". Journal of Medicinal Chemistry. 64 (22): 16598–16608. doi:10.1021/acs.jmedchem.1c01174. PMID34762432. S2CID244040645.
^Wong AK, Finch AM, Pierens GK, Craik DJ, Taylor SM, Fairlie DP (August 1998). "Small molecular probes for G-protein-coupled C5a receptors: conformationally constrained antagonists derived from the C terminus of the human plasma protein C5a". Journal of Medicinal Chemistry. 41 (18): 3417–3425. doi:10.1021/jm9800651. PMID9719594.
^Gong Y, Barbay JK, Buntinx M, Li J, Wauwe JV, Claes C, et al. (July 2008). "Design and optimization of aniline-substituted tetrahydroquinoline C5a receptor antagonists". Bioorganic & Medicinal Chemistry Letters. 18 (14): 3852–3855. doi:10.1016/j.bmcl.2008.06.059. PMID18595693.
Beil WJ, Schulz M, Wefelmeyer U (July 2000). "Mast cell granule composition and tissue location--a close correlation". Histology and Histopathology. 15 (3): 937–946. PMID10963136.
Yamamoto T (January 2007). "Roles of the ribosomal protein S19 dimer and the C5a receptor in pathophysiological functions of phagocytic leukocytes". Pathology International. 57 (1): 1–11. doi:10.1111/j.1440-1827.2007.02049.x. PMID17199736. S2CID22946804.
Bao L, Gerard NP, Eddy RL, Shows TB, Gerard C (June 1992). "Mapping of genes for the human C5a receptor (C5AR), human FMLP receptor (FPR), and two FMLP receptor homologue orphan receptors (FPRH1, FPRH2) to chromosome 19". Genomics. 13 (2): 437–440. doi:10.1016/0888-7543(92)90265-T. PMID1612600.
Boulay F, Mery L, Tardif M, Brouchon L, Vignais P (March 1991). "Expression cloning of a receptor for C5a anaphylatoxin on differentiated HL-60 cells". Biochemistry. 30 (12): 2993–2999. doi:10.1021/bi00226a002. PMID2007135.
Kohleisen B, Shumay E, Sutter G, Foerster R, Brack-Werner R, Nuesse M, et al. (December 1999). "Stable expression of HIV-1 Nef induces changes in growth properties and activation state of human astrocytes". AIDS. 13 (17): 2331–2341. doi:10.1097/00002030-199912030-00004. PMID10597774.
"Anaphylatoxin Receptors: C5a". IUPHAR Database of Receptors and Ion Channels. International Union of Basic and Clinical Pharmacology. Archived from the original on 2014-04-07. Retrieved 2007-10-25.