Tumor necrosis factor receptor superfamily, member 4 (TNFRSF4), also known as CD134 and OX40 receptor, 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 co-stimulatory immune checkpoint 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.
Background References
1. Kwiatek M et al. OX40 (CD134) Expression on T Regulatory Cells Is Related to Serious Hypertensive Disorders in Pregnancy. J Cardiovasc Dev Dis. 2023 Oct
2. Ansari AW et al. Azithromycin downregulates ICOS (CD278) and OX40 (CD134) expression and mTOR activity of TCR-activated T cells to inhibit proliferation. Int Immunopharmacol. 2023 Nov
Western blot analysis of CD134 on different lysates with Rabbit anti-CD134 antibody (HA722700) at 1/1,000 dilution.
Lane 1: HUT 102 cell lysate Lane 2: Jurkat cell lysate (negative)
Lysates/proteins at 20 µg/Lane.
Predicted band size: 29 kDa Observed band size: 50 kDa
Exposure time: 14 seconds; ECL: K1801;
4-20% SDS-PAGE gel.
Proteins were transferred to a PVDF membrane and blocked with 5% NFDM/TBST for 1 hour at room temperature. The primary antibody (HA722700) at 1/1,000 dilution was used in 5% NFDM/TBST at 4℃ overnight. Goat Anti-Rabbit IgG - HRP Secondary Antibody (HA1001) at 1/50,000 dilution was used for 1 hour at room temperature.
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