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- CD134 abstract "CD134, also known as OX40, is a member of the TNFR-superfamily of receptors which is not constitutively expressed on resting naïve T cells, unlike CD28. OX40 is a secondary costimulatory molecule, expressed after 24 to 72 hours following activation; its ligand, OX40L, is also not expressed on resting antigen presenting cells, but is following their activation. Expression of OX40 is dependent on full activation of the T cell; without CD28, expression of OX40 is delayed and of fourfold lower levels.OX40 has no effect on the proliferative abilities of CD4+ cells for the first three days, however after this time proliferation begins to slow and cells die at a greater rate, due to an inability to maintain a high level of PKB activity and expression of Bcl-2, Bcl-XL and survivin. OX40 binds to receptors on T-cells, preventing them from dying and subsequently increasing cytokine production. OX40 has a critical role in the maintenance of an immune response beyond the first few days and onwards to a memory response due to its ability to enhance survival. OX40 also plays a crucial role in both Th1 and Th2 mediated reactions in vivo.OX40 binds TRAF2, 3 and 5 as well as PI3K by an unknown mechanism. TRAF2 is required for survival via NF-κB and memory cell generation whereas TRAF5 seems to have a more negative or modulatory role, as knockouts have higher levels of cytokines and are more susceptible to Th2-meditated inflammation. TRAF3 may play a critical role in OX40-mediated signal transduction. CTLA-4 is down-regulated following OX40 engagement in vivo and the OX40-specific TRAF3 DN defect was partially overcome by CTLA-4 blockade in vivo. TRAF3 may be linked to OX40-mediated memory T cell expansion and survival, and point to the down-regulation of CTLA-4 as a possible control element to enhance early T cell expansion through OX40 signaling.OX40 has been implicated in the pathologic cytokine storm associated with certain viral infections, including the H5N1 bird flu. An artificially created biologic fusion protein, OX40-immunoglobulin (OX40-Ig), prevents OX40 from reaching the T-cell receptors, thus reducing the T-cell response. Experiments in mice have demonstrated that OX40-Ig can reduce the symptoms associated with the cytokine storm (an immune overreaction) while allowing the immune system to fight off the virus successfully.".
- CD134 entrezgene "7293".
- CD134 wikiPageID "8420002".
- CD134 wikiPageRevisionID "603075039".
- CD134 hasPhotoCollection CD134.
- CD134 requireManualInspection "no".
- CD134 updateCitations "no".
- CD134 updatePage "yes".
- CD134 updateProteinBox "yes".
- CD134 updateSummary "no".
- CD134 subject Category:Clusters_of_differentiation.
- CD134 subject Category:T_cells.
- CD134 type Biomolecule.
- CD134 type Protein.
- CD134 type BiologicalObject.
- CD134 comment "CD134, also known as OX40, is a member of the TNFR-superfamily of receptors which is not constitutively expressed on resting naïve T cells, unlike CD28. OX40 is a secondary costimulatory molecule, expressed after 24 to 72 hours following activation; its ligand, OX40L, is also not expressed on resting antigen presenting cells, but is following their activation.".
- CD134 label "CD134".
- CD134 label "OX40".
- CD134 sameAs m.0272snw.
- CD134 sameAs Q5009779.
- CD134 sameAs Q5009779.
- CD134 wasDerivedFrom CD134?oldid=603075039.
- CD134 isPrimaryTopicOf CD134.