CD40 (protein)

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CD40
Protein CD40 PDB 1CDF.png
Available structures
PDB Ortholog search: PDBe RCSB
Identifiers
Aliases CD40, Bp50, CDW40, TNFRSF5, p50, CD40 (protein), CD40 molecule
External IDs MGI: 88336 HomoloGene: 954 GeneCards: CD40
RNA expression pattern
PBB GE CD40 205153 s at fs.png

PBB GE CD40 35150 at fs.png

PBB GE CD40 215346 at fs.png
More reference expression data
Orthologs
Species Human Mouse
Entrez
Ensembl
UniProt
RefSeq (mRNA)

NM_001250
NM_001302753
NM_152854
NM_001322421
NM_001322422

NM_011611
NM_170702
NM_170703
NM_170704

RefSeq (protein)

NP_001241
NP_001289682
NP_001309350
NP_001309351
NP_690593

NP_035741
NP_733803
NP_733804
NP_733805

Location (UCSC) Chr 20: 46.12 – 46.13 Mb Chr 2: 165.06 – 165.07 Mb
PubMed search [1] [2]
Wikidata
View/Edit Human View/Edit Mouse

Cluster of differentiation 40, CD40 is a costimulatory protein found on antigen presenting cells and is required for their activation. The binding of CD154 (CD40L) on TH cells to CD40 activates antigen presenting cells and induces a variety of downstream effects.

Deficiency can cause Hyper-IgM syndrome type 3.

Function[edit]

The protein receptor encoded by this gene is a member of the TNF-receptor superfamily. This receptor has been found to be essential in mediating a broad variety of immune and inflammatory responses including T cell-dependent immunoglobulin class switching, memory B cell development, and germinal center formation.[3] AT-hook transcription factor AKNA is reported to coordinately regulate the expression of this receptor and its ligand, which may be important for homotypic cell interactions. The TNFR-receptor associated factor adaptor proteins TRAF1, TRAF2, TRAF6 and possibly TRAF5 interact with this receptor serve as mediators of the signal transduction. The interaction of this receptor and its ligand is found to be necessary for amyloid-beta-induced microglial activation, and thus is thought to be an early event in Alzheimer disease pathogenesis. Two alternatively spliced transcript variants of this gene encoding distinct isoforms have been reported.[4]

Specific effects on cells[edit]

In the macrophage, the primary signal for activation is IFN-γ from Th1 type CD4 T cells. The secondary signal is CD40L (CD154) on the T cell which binds CD40 on the macrophage cell surface. As a result, the macrophage expresses more CD40 and TNF receptors on its surface which helps increase the level of activation. The increase in activation results in the induction of potent microbicidal substances in the macrophage, including reactive oxygen species and nitric oxide, leading to the destruction of ingested microbe.

The B cell can present antigens to helper T cells. If an activated T cell recognizes the peptide presented by the B cell, the CD40L on the T cell binds to the B cell's CD40 receptor, causing resting B cell activation. The T cell also produces IL-2, which directly influences B cells. As a result of this net stimulation, the B cell can undergo division, antibody isotype switching, and differentiation to plasma cells. The end-result is a B cell that is able to mass-produce specific antibodies against an antigenic target. Early evidence for these effects were that in CD40 or CD154 deficient mice, there is little class switching or germinal centre formation,[5] and immune responses are severely inhibited.

The expression of CD40 is diverse. CD40 is constitutively expressed by antigen presenting cells, including dendritic cells, B cells and macrophages. It can also be expressed by endothelial cells, smooth muscle cells, fibroblasts and epithelial cells.[6] Consistent with its widespread expression on normal cells, CD40 is also expressed on a wide range of tumor cells, including non-Hodgkin's and Hodgkin's lymphomas, myeloma and some carcinomas including nasopharynx, bladder, cervix, kidney and ovary. CD40 is also expressed on B cell precursors in the bone marrow, and there is some evidence that CD40-CD154 interactions may play a role in the control of B cell haematopoiesis.[7]

Interactions[edit]

CD40 (protein) has been shown to interact with TRAF2,[8][9][10] TRAF3,[9][11][12][13] TRAF6,[9][13] TRAF5[9][14] and TTRAP.[15]

References[edit]

  1. ^ "Human PubMed Reference:". 
  2. ^ "Mouse PubMed Reference:". 
  3. ^ Grewal, IS; Flavell, RA (1998). "CD40 and CD154 in cell-mediated immunity". Annual Review of Immunology. 16: 111–35. PMID 9597126. doi:10.1146/annurev.immunol.16.1.111. 
  4. ^ "Entrez Gene: CD40 CD40 molecule, TNF receptor superfamily member 5". 
  5. ^ Kawabe, T; et al. (1994-06-01). "The immune response in CD40-deficient mice: impaired immunoglobulin class switching and germinal center formation". Immunity. 1 (3): 167–78. doi:10.1016/1074-7613(94)90095-7. 
  6. ^ Chatzigeorgiou A, Lyberi M, Chatzilymperis G, Nezos A, Kamper E (2009). "CD40/CD40L signaling and its implication in health and disease". BioFactors (Oxford, England). 35 (6): 474–83. PMID 19904719. doi:10.1002/biof.62. 
  7. ^ Carlring J, Altaher HM, Clark S, Chen X, Latimer SL, Jenner T, Buckle AM, Heath AW (May 2011). "CD154-CD40 interactions in the control of murine B cell hematopoiesis". Journal of Leukocyte Biology. 89 (5): 697–706. PMC 3382295Freely accessible. PMID 21330346. doi:10.1189/jlb.0310179. 
  8. ^ McWhirter SM, Pullen SS, Holton JM, Crute JJ, Kehry MR, Alber T (Jul 1999). "Crystallographic analysis of CD40 recognition and signaling by human TRAF2". Proceedings of the National Academy of Sciences of the United States of America. 96 (15): 8408–13. PMC 17529Freely accessible. PMID 10411888. doi:10.1073/pnas.96.15.8408. 
  9. ^ a b c d Tsukamoto N, Kobayashi N, Azuma S, Yamamoto T, Inoue J (Feb 1999). "Two differently regulated nuclear factor kappaB activation pathways triggered by the cytoplasmic tail of CD40". Proceedings of the National Academy of Sciences of the United States of America. 96 (4): 1234–9. PMC 15446Freely accessible. PMID 9990007. doi:10.1073/pnas.96.4.1234. 
  10. ^ Malinin NL, Boldin MP, Kovalenko AV, Wallach D (Feb 1997). "MAP3K-related kinase involved in NF-kappaB induction by TNF, CD95 and IL-1". Nature. 385 (6616): 540–4. PMID 9020361. doi:10.1038/385540a0. 
  11. ^ Hu HM, O'Rourke K, Boguski MS, Dixit VM (Dec 1994). "A novel RING finger protein interacts with the cytoplasmic domain of CD40". The Journal of Biological Chemistry. 269 (48): 30069–72. PMID 7527023. 
  12. ^ Ni CZ, Welsh K, Leo E, Chiou CK, Wu H, Reed JC, Ely KR (Sep 2000). "Molecular basis for CD40 signaling mediated by TRAF3". Proceedings of the National Academy of Sciences of the United States of America. 97 (19): 10395–9. PMC 27035Freely accessible. PMID 10984535. doi:10.1073/pnas.97.19.10395. 
  13. ^ a b Roy N, Deveraux QL, Takahashi R, Salvesen GS, Reed JC (Dec 1997). "The c-IAP-1 and c-IAP-2 proteins are direct inhibitors of specific caspases". The EMBO Journal. 16 (23): 6914–25. PMC 1170295Freely accessible. PMID 9384571. doi:10.1093/emboj/16.23.6914. 
  14. ^ Ishida TK, Tojo T, Aoki T, Kobayashi N, Ohishi T, Watanabe T, Yamamoto T, Inoue J (Sep 1996). "TRAF5, a novel tumor necrosis factor receptor-associated factor family protein, mediates CD40 signaling". Proceedings of the National Academy of Sciences of the United States of America. 93 (18): 9437–42. PMC 38446Freely accessible. PMID 8790348. doi:10.1073/pnas.93.18.9437. 
  15. ^ Pype S, Declercq W, Ibrahimi A, Michiels C, Van Rietschoten JG, Dewulf N, de Boer M, Vandenabeele P, Huylebroeck D, Remacle JE (Jun 2000). "TTRAP, a novel protein that associates with CD40, tumor necrosis factor (TNF) receptor-75 and TNF receptor-associated factors (TRAFs), and that inhibits nuclear factor-kappa B activation". The Journal of Biological Chemistry. 275 (24): 18586–93. PMID 10764746. doi:10.1074/jbc.M000531200. 

External links[edit]

Further reading[edit]