World Library  
Flag as Inappropriate
Email this Article


Article Id: WHEBN0012303538
Reproduction Date:

Title: Cd9  
Author: World Heritage Encyclopedia
Language: English
Subject: CD81, PTGFRN, CD29, CD46, CD37
Publisher: World Heritage Encyclopedia


CD9 molecule
Symbols  ; BTCC-1; DRAP-27; MIC3; MRP-1; TSPAN-29; TSPAN29
External IDs GeneCards:
RNA expression pattern
Species Human Mouse
RefSeq (mRNA)
RefSeq (protein)
Location (UCSC)
PubMed search

CD9 antigen is a protein that in humans is encoded by the CD9 gene.[1] The protein encoded by this gene is a member of the transmembrane 4 superfamily, also known as the tetraspanin family. Most of these members are cell-surface proteins that are characterized by the presence of four hydrophobic domains. The proteins mediate signal transduction events that play a role in the regulation of cell development, activation, growth and motility.

CD9 is a cell surface glycoprotein that is known to complex with integrins and other transmembrane 4 superfamily proteins. It is found on the surface of exosomes. It can modulate cell adhesion and migration and also trigger platelet activation and aggregation. In addition, the protein appears to promote muscle cell fusion and support myotube maintenance.[2] This protein also seems to be a key part in the egg-sperm fusion during mammalian fertilization, as CD9 knocked-out mice gametes don't undergo fusion.[3] CD9 is located in the microvillar membrane of the oocytes and also appears to intervene in maintaining the normal shape of oocyte microvilli.[4]

See also


CD9 has been shown to interact with TSPAN4,[5] PTGFRN,[6][7] CD81,[8][9] CD117,[10] CD46,[11] CD29[8][12] and CD49c.[13][14]


  1. ^ Katz F, Povey S, Parkar M, Schneider C, Sutherland R, Stanley K, Solomon E, Greaves M (March 1984). "Chromosome assignment of monoclonal antibody-defined determinants on human leukemic cells". Eur J Immunol 13 (12): 1008–1013.  
  2. ^ "Entrez Gene: CD9 CD9 molecule". 
  3. ^ François Le Naour et al. (2000). "Severely Reduced Female Fertility in CD9-Deficient Mice". Science 287 (5451): 319–321.  
  4. ^ Kathryn E. Runge et al. (2007). "Oocyte CD9 is enriched on the microvillar membrane and required for normal microvillar shape and distribution". Developmental Biology 304 (1): 317–325.  
  5. ^ Tachibana, I; Bodorova J; Berditchevski F; Zutter M M; Hemler M E (November 1997). "NAG-2, a novel transmembrane-4 superfamily (TM4SF) protein that complexes with integrins and other TM4SF proteins". J. Biol. Chem. (UNITED STATES) 272 (46): 29181–29189.  
  6. ^ Charrin, S; Le Naour F; Oualid M; Billard M; Faure G; Hanash S M; Boucheix C; Rubinstein E (April 2001). "The major CD9 and CD81 molecular partner. Identification and characterization of the complexes". J. Biol. Chem. (United States) 276 (17): 14329–37.  
  7. ^ Stipp, C S; Orlicky D; Hemler M E (February 2001). "FPRP, a major, highly stoichiometric, highly specific CD81- and CD9-associated protein". J. Biol. Chem. (United States) 276 (7): 4853–4862.  
  8. ^ a b Radford, K J; Thorne R F; Hersey P (May 1996). "CD63 associates with transmembrane 4 superfamily members, CD9 and CD81, and with beta 1 integrins in human melanoma". Biochem. Biophys. Res. Commun. (UNITED STATES) 222 (1): 13–18.  
  9. ^ Horváth, G; Serru V; Clay D; Billard M; Boucheix C; Rubinstein E (November 1998). "CD19 is linked to the integrin-associated tetraspans CD9, CD81, and CD82". J. Biol. Chem. (UNITED STATES) 273 (46): 30537–30543.  
  10. ^ Anzai, Naoyuki; Lee Younghee; Youn Byung-S; Fukuda Seiji; Kim Young-June; Mantel Charlie; Akashi Makoto; Broxmeyer Hal E (June 2002). "C-kit associated with the transmembrane 4 superfamily proteins constitutes a functionally distinct subunit in human hematopoietic progenitors". Blood (United States) 99 (12): 4413–4421.  
  11. ^ Lozahic, S; Christiansen D; Manié S; Gerlier D; Billard M; Boucheix C; Rubinstein E (March 2000). "CD46 (membrane cofactor protein) associates with multiple beta1 integrins and tetraspans". Eur. J. Immunol. (GERMANY) 30 (3): 900–907.  
  12. ^ Mazzocca, Antonio; Carloni Vinicio; Sciammetta Silvia; Cordella Claudia; Pantaleo Pietro; Caldini Anna; Gentilini Paolo; Pinzani Massimo (September 2002). "Expression of transmembrane 4 superfamily (TM4SF) proteins and their role in hepatic stellate cell motility and wound healing migration". J. Hepatol. (England) 37 (3): 322–330.  
  13. ^ Park, K R; Inoue T; Ueda M; Hirano T; Higuchi T; Maeda M; Konishi I; Fujiwara H; Fujii S (March 2000). "CD9 is expressed on human endometrial epithelial cells in association with integrins alpha(6), alpha(3) and beta(1)". Mol. Hum. Reprod. (ENGLAND) 6 (3): 252–257.  
  14. ^ Hirano, T; Higuchi T; Ueda M; Inoue T; Kataoka N; Maeda M; Fujiwara H; Fujii S (February 1999). "CD9 is expressed in extravillous trophoblasts in association with integrin alpha3 and integrin alpha5". Mol. Hum. Reprod. (ENGLAND) 5 (2): 162–167.  

Further reading

This article was sourced from Creative Commons Attribution-ShareAlike License; additional terms may apply. World Heritage Encyclopedia content is assembled from numerous content providers, Open Access Publishing, and in compliance with The Fair Access to Science and Technology Research Act (FASTR), Wikimedia Foundation, Inc., Public Library of Science, The Encyclopedia of Life, Open Book Publishers (OBP), PubMed, U.S. National Library of Medicine, National Center for Biotechnology Information, U.S. National Library of Medicine, National Institutes of Health (NIH), U.S. Department of Health & Human Services, and, which sources content from all federal, state, local, tribal, and territorial government publication portals (.gov, .mil, .edu). Funding for and content contributors is made possible from the U.S. Congress, E-Government Act of 2002.
Crowd sourced content that is contributed to World Heritage Encyclopedia is peer reviewed and edited by our editorial staff to ensure quality scholarly research articles.
By using this site, you agree to the Terms of Use and Privacy Policy. World Heritage Encyclopedia™ is a registered trademark of the World Public Library Association, a non-profit organization.

Copyright © World Library Foundation. All rights reserved. eBooks from Project Gutenberg are sponsored by the World Library Foundation,
a 501c(4) Member's Support Non-Profit Organization, and is NOT affiliated with any governmental agency or department.