Basigin (BSG) also known as extracellular matrix metalloproteinase inducer (EMMPRIN) or cluster of differentiation 147 (CD147) is a protein that in humans is encoded by the BSGgene.[5][6][7] This protein is a determinant for the Ok blood group system. There are three known antigens in the Ok system; the most common being Oka (also called OK1), OK2 and OK3. Basigin has been shown to be an essential receptor on red blood cells for the human malaria parasite, Plasmodium falciparum.[8] The common isoform of basigin (basigin-2) has two immunoglobulin domains, and the extended form basigin-1 has three.[9]
Basigin is a member of the immunoglobulin superfamily, with a structure related to the putative primordial form of the family. As members of the immunoglobulin superfamily play fundamental roles in intercellular recognition involved in various immunologic phenomena, differentiation, and development, basigin is thought also to play a role in intercellular recognition (Miyauchi et al., 1991; Kanekura et al., 1991).[10][11]
It has a variety of functions. In addition to its metalloproteinase-inducing ability, basigin also regulates several distinct functions, such as spermatogenesis, expression of the monocarboxylate transporter and the responsiveness of lymphocytes.[6]
Basigin is a type I integral membrane receptor that has many ligands, including the cyclophilin (CyP) proteins Cyp-A and CyP-B and certain integrins.[12][13][14] Basigin also serves as a receptor for S100A9 and platelet glycoprotein VI, and basigin-1 acts as a receptor for the rod-derived cone viability factor.[9] It is expressed by many cell types, including epithelial cells, endothelial cells, neural progenitor cells[15] and leukocytes. The human basigin protein contains 269 amino acids that form two heavily glycosylatedC2 type immunoglobulin-like domains at the N-terminal extracellular portion. A second form of basigin has also been characterized that contains one additional immunoglobulin-like domain in its extracellular portion.[6]
Basigin has been shown to form a complex with monocarboxylate transporters in the retina of mice. Basigin appears to be required for proper placement of MCTs in the membrane. In the Basigin null mouse, the failure of MCTs to integrate with the membrane may be directly linked to a failure of nutrient transfer in the retinal pigmented epithelium (the lactates transported by MCTs 1, 3, and 4 are essential nutrients for the developing RPE), resulting in loss of sight in the null animal.[17]
It has recently (November 2011) been found that basigin is a receptor that is essential to erythrocyte invasion by most strains of Plasmodium falciparum, the most virulent species of the plasmodium parasites that cause human malaria. It is hoped that by developing antibodies to the parasite ligand for Basigin, Rh5, a better vaccine for malaria might be found.[8] Basigin is bound by the PfRh5 protein on the surface of the malaria parasite.[citation needed]
Meplazumab, an anti-CD147 antibody, was tested in patients with SARS-CoV-2 pneumonia.[22]
Some of these claims have been challenged by another group of scientists who found no evidence of a direct role for basigin in either binding the viral spike protein or promoting lung cell infection.[23]
More recent studies suggests CD147 as SARS-CoV-2 entry receptor of platelets and megakaryocytes, leading to hyperactivation and thrombosis, that differs from common cold coronavirus CoV-OC43. Incubation of megakaryocyte cells with SARS-CoV-2 resulted in a significant increase in the proinflammatory transcripts LGALS3BP and S100A9. Notably, CD147 antibody-mediated blocking significantly reduced the expression of S100A9, and S100A8 on megakaryocytes following incubation with SARS-CoV-2. These data indicate that megakaryocytes and platelets actively take up SARS-CoV-2 virions, likely via an ACE-2-independent mechanism.[24]
Another study states that platelets challenged with SARS-CoV-2 undergo activation, dependent on the CD147 receptor.[25] Yet SARS-CoV-2 does not replicate in human platelets, but initiates cell death.[26]
^Miyauchi T, Masuzawa Y, Muramatsu T (November 1991). "The basigin group of the immunoglobulin superfamily: complete conservation of a segment in and around transmembrane domains of human and mouse basigin and chicken HT7 antigen". Journal of Biochemistry. 110 (5): 770–774. doi:10.1093/oxfordjournals.jbchem.a123657. PMID1783610.
^Yurchenko V, O'Connor M, Dai WW, Guo H, Toole B, Sherry B, Bukrinsky M (November 2001). "CD147 is a signaling receptor for cyclophilin B". Biochemical and Biophysical Research Communications. 288 (4): 786–788. doi:10.1006/bbrc.2001.5847. PMID11688976.
^Kanemitsu M, Tsupykov O, Potter G, Boitard M, Salmon P, Zgraggen E, et al. (November 2017). "EMMPRIN overexpression in SVZ neural progenitor cells increases their migration towards ischemic cortex". Experimental Neurology. 297: 14–24. doi:10.1016/j.expneurol.2017.07.009. PMID28716558. S2CID4587600.
^Wang WJ, Li QQ, Xu JD, Cao XX, Li HX, Tang F, et al. (2008). "Interaction between CD147 and P-glycoprotein and their regulation by ubiquitination in breast cancer cells". Chemotherapy. 54 (4): 291–301. doi:10.1159/000151225. PMID18689982. S2CID7260048.
Muramatsu T, Miyauchi T (July 2003). "Basigin (CD147): a multifunctional transmembrane protein involved in reproduction, neural function, inflammation and tumor invasion". Histology and Histopathology. 18 (3): 981–987. doi:10.14670/HH-18.981. PMID12792908. S2CID4635815.
Nabeshima K, Lane WS, Biswas C (February 1991). "Partial sequencing and characterization of the tumor cell-derived collagenase stimulatory factor". Archives of Biochemistry and Biophysics. 285 (1): 90–96. doi:10.1016/0003-9861(91)90332-D. PMID1846736.
Kaname T, Miyauchi T, Kuwano A, Matsuda Y, Muramatsu T, Kajii T (1993). "Mapping basigin (BSG), a member of the immunoglobulin superfamily, to 19p13.3". Cytogenetics and Cell Genetics. 64 (3–4): 195–197. doi:10.1159/000133573. PMID8404035.
Spring FA, Holmes CH, Simpson KL, Mawby WJ, Mattes MJ, Okubo Y, Parsons SF (April 1997). "The Oka blood group antigen is a marker for the M6 leukocyte activation antigen, the human homolog of OX-47 antigen, basigin and neurothelin, an immunoglobulin superfamily molecule that is widely expressed in human cells and tissues". European Journal of Immunology. 27 (4): 891–897. doi:10.1002/eji.1830270414. PMID9130641. S2CID23072979.
Guo H, Majmudar G, Jensen TC, Biswas C, Toole BP, Gordon MK (October 1998). "Characterization of the gene for human EMMPRIN, a tumor cell surface inducer of matrix metalloproteinases". Gene. 220 (1–2): 99–108. doi:10.1016/S0378-1119(98)00400-4. PMID9767135.
Yurchenko V, O'Connor M, Dai WW, Guo H, Toole B, Sherry B, Bukrinsky M (November 2001). "CD147 is a signaling receptor for cyclophilin B". Biochemical and Biophysical Research Communications. 288 (4): 786–788. doi:10.1006/bbrc.2001.5847. PMID11688976.
Thorns C, Feller AC, Merz H (2002). "EMMPRIN (CD 147) is expressed in Hodgkin's lymphoma and anaplastic large cell lymphoma. An immunohistochemical study of 60 cases". Anticancer Research. 22 (4): 1983–1986. PMID12174874. INIST14501263NAID10020332737.
