Stimulated T cells were incubated in lysis buffer. For signaling complex analyses, cell lysates were pre-cleared with Protein G beads prior to immunoprecipitation with anti-RIPK1 antibody. Antibodies and reagents used for immunoprecipitation and immunoblotting studies included: anti-RIPK1, anti-Bim, anti-Bclx, (BD Biosciences), nec1, anti-Bcl2, β-actin (Merck chemicals), anti-RIPK3 (ProSci Incorporated), anti-ubiquitin, anti-Bax, anti-RIPK3 (Santa Cruz Biotechnology), anti-RIPK1, anti-A20 (Cell signaling Technology), QVD, ZVAD (Enzo Life Science).
Signaling studies in MEFs were performed as described19 (link). RIPK1 immunoprecipitations were performed using anti-RIPK1 (Cell Signaling) and Dynabeads M270 Epoxy (Invitrogen). K63-ubiquitin immunoprecipitations were performed using anti-K63 (Millipore) and Dynabead Protein A (Invitrogen). Studies of RIPK3 mutants in A20−/−Ripk3−/− MEFs were performed by generating RIPK3 lysine mutants, introducing mutant RIPK3-encoding cDNAs into GFP expressing lentiviral constructs, and infecting A20−/−Ripk3−/− MEFs with these viruses. Productively infected cells were FACS-sorted to obtain pure populations of RIPK3-expressing cells prior to being tested in necroptosis assays. Cell survival of MEFs was quantitated using the CellTiter-Glo Luminescent Cell Viability Assay per manufacturer’s instructions (Promega).
Signaling studies in MEFs were performed as described19 (link). RIPK1 immunoprecipitations were performed using anti-RIPK1 (Cell Signaling) and Dynabeads M270 Epoxy (Invitrogen). K63-ubiquitin immunoprecipitations were performed using anti-K63 (Millipore) and Dynabead Protein A (Invitrogen). Studies of RIPK3 mutants in A20−/−Ripk3−/− MEFs were performed by generating RIPK3 lysine mutants, introducing mutant RIPK3-encoding cDNAs into GFP expressing lentiviral constructs, and infecting A20−/−Ripk3−/− MEFs with these viruses. Productively infected cells were FACS-sorted to obtain pure populations of RIPK3-expressing cells prior to being tested in necroptosis assays. Cell survival of MEFs was quantitated using the CellTiter-Glo Luminescent Cell Viability Assay per manufacturer’s instructions (Promega).
