Association between BTK and MYD88 identified via co-immunoprecipitation, and altered following treatment with ST2825 in MYD88 L265P-expressing ABC DLBCL cells. (A) Immunoprecipitation of cell lysates was performed via pull-down with an anti-MYD88 antibody followed by IB with an anti-BTK antibody. (B) In a reciprocal experiment, pull-down was performed with and anti-BTK antibody and IB with anti-MYD88 antibodies. (C) Immunoprecipitation of BTK with MYD88 was conducted following a 6-h treatment with 20 µM ST2825 or DMSO in MYD88 L265P mutant-ABC DLBCL cells (OCY-LY10 and TMD8). The data present a representative of at least two independent experiments. MYD88, myeloid differentiation primary response gene 88; BTK, Bruton's tyrosine kinase; ABC, activated B cell; DLBCA, diffuse large B-cell lymphoma; IB, immunoblot; IP, Immunoprecipitation; IgG, immunoglobulin G.