Journal: Research and Practice in Thrombosis and Haemostasis
Article Title: Optimization of a Western blot protocol for the detection of low levels of tissue factor in human cells
doi: 10.1016/j.rpth.2025.103016
Figure Lengend Snippet: Effect of different secondary antibodies on the detection of tissue factor (TF) by Western blotting using the same primary antibody. Cell lysates from HAP-1 wild-type (WT) and HAP-1 TF knockout (KO; both 40 μg) and recombinant TF (rTF; Innovin, 500 pg, Thermo Fisher Scientific, catalog [cat] number 10873566) were run on a gel, and proteins were transferred to a membrane. The blots were blocked with 5% nonfat milk (Walmart, nonfat dry milk powder) in Tris-buffered saline (TBS)-Tween. TF was detected using a goat anti-TF polyclonal antibody (R&D Systems, cat number AF2339) diluted 1:1000 in 5% bovine serum albumin in TBS-Tween. Anti-TF antibody binding was detected using either a mouse antigoat horseradish peroxidase (HRP)-linked secondary antibody (Santa Cruz, cat number sc-2354), a rabbit antigoat HRP-linked secondary antibody (Thermo Fisher Scientific, cat number 31402), or a donkey antigoat HRP-linked secondary antibody (Thermo Fisher Scientific, cat number A15999), all diluted 1:5000 in blocking buffer. The membranes were incubated with Clarity Max Western Enhanced Chemiluminescence Substrate (Bio-Rad, cat number 1705062) for 10 seconds. β-Actin was used as a loading control and was detected using a mouse anti–β-actin antibody (Santa Cruz, cat number sc-47778) diluted 1:5000 in 5% bovine serum albumin in TBS-Tween. An HRP-linked horse anti-mouse HRP antibody (Cell Signaling Technologies, cat number 7076) diluted 1:5000 in blocking buffer was used to detect anti–β-actin binding. Clarity Western Enhanced Chemiluminescence Substrate was added for 10 seconds prior to imaging. For imaging, the blot was exposed for 5 seconds (TF) and 10 seconds (β-actin). The blots were visualized using the iBright FL1000 imaging system (Thermo Fisher Scientific). kDa, kilodalton.
Article Snippet: We compared the ability of 4 commercially available anti-human TF antibodies to detect human TF in low-expressing cell lines: rabbit anti-human TF antibody NBP2-15139 (Novus Biologicals), goat anti-human TF antibody AF2339 (R&D Systems), rabbit anti-human TF antibody ab252918 (clone EPR22548-240, designated Abcam 1), and rabbit anti-human TF antibody ab228968 (clone EPR22548-232, designated Abcam 2; ).
Techniques: Western Blot, Knock-Out, Recombinant, Membrane, Saline, Binding Assay, Blocking Assay, Incubation, Control, Imaging