PMID- 27221486 OWN - NLM STAT- MEDLINE DCOM- 20171213 LR - 20181113 IS - 1940-6029 (Electronic) IS - 1064-3745 (Print) IS - 1064-3745 (Linking) VI - 1417 DP - 2016 TI - Measuring NLR Oligomerization I: Size Exclusion Chromatography, Co-immunoprecipitation, and Cross-Linking. PG - 131-43 LID - 10.1007/978-1-4939-3566-6_8 [doi] AB - Oligomerization of nod-like receptors (NLRs) can be detected by several biochemical techniques dependent on the stringency of protein-protein interactions. Some of these biochemical methods can be combined with functional assays, such as caspase-1 activity assay. Size exclusion chromatography (SEC) allows separation of native protein lysates into different sized complexes by fast protein liquid chromatography (FPLC) for follow-up analysis. Using co-immunoprecipitation (co-IP), combined with SEC or on its own, enables subsequent antibody-based purification of NLR complexes and associated proteins, which can then be analyzed by immunoblot and/or subjected to functional caspase-1 activity assay. Chemical cross-linking covalently joins two or more molecules, thus capturing the oligomeric state with high sensitivity and stability. Apoptosis-associated speck-like protein containing a caspase activation domain (ASC) oligomerization has been successfully used as readout for NLR or AIM2-like receptor (ALR) inflammasome activation in response to various pathogen- or damage-associated molecular patterns (PAMPs or DAMPs) in human and mouse macrophages and THP-1 cells. Here, we provide a detailed description of the methods used for NLRP7 oligomerization in response to infection with Staphylococcus aureus (S. aureus) in primary human macrophages, co-immunoprecipitation and immunoblot analysis of NLRP7 and NLRP3 inflammasome complexes, as well as caspase-1 activity assays. Also, ASC oligomerization is shown in response to dsDNA, LPS/ATP, and LPS/nigericin in mouse bone marrow-derived macrophages (BMDMs) and/or THP-1 cells or human primary macrophages. FAU - Khare, Sonal AU - Khare S AD - Division of Rheumatology, Department of Medicine, Feinberg School of Medicine, Northwestern University, McGaw Pavilion Suite M-300, 240 E Huron, Chicago, IL, 60611, USA. FAU - Radian, Alexander D AU - Radian AD AD - Division of Rheumatology, Department of Medicine, Feinberg School of Medicine, Northwestern University, McGaw Pavilion Suite M-300, 240 E Huron, Chicago, IL, 60611, USA. FAU - Dorfleutner, Andrea AU - Dorfleutner A AD - Division of Rheumatology, Department of Medicine, Feinberg School of Medicine, Northwestern University, McGaw Pavilion Suite M-300, 240 E Huron, Chicago, IL, 60611, USA. FAU - Stehlik, Christian AU - Stehlik C AD - Division of Rheumatology, Department of Medicine, Feinberg School of Medicine, Northwestern University, McGaw Pavilion Suite M-300, 240 E Huron, Chicago, IL, 60611, USA. c-stehlik@northwestern.edu. LA - eng GR - R01 GM071723/GM/NIGMS NIH HHS/United States GR - R21 AI120618/AI/NIAID NIH HHS/United States GR - R01 AI099009/AI/NIAID NIH HHS/United States GR - K01 AR066739/AR/NIAMS NIH HHS/United States GR - R01 AR064349/AR/NIAMS NIH HHS/United States GR - R01 AI120625/AI/NIAID NIH HHS/United States PT - Journal Article PT - Research Support, N.I.H., Extramural PT - Research Support, Non-U.S. Gov't PL - United States TA - Methods Mol Biol JT - Methods in molecular biology (Clifton, N.J.) JID - 9214969 RN - 0 (Adaptor Proteins, Signal Transducing) RN - 0 (CARD Signaling Adaptor Proteins) RN - 0 (Cross-Linking Reagents) RN - 0 (NLR Family, Pyrin Domain-Containing 3 Protein) RN - 0 (NLRP7 protein, human) RN - 0 (PYCARD protein, human) SB - IM MH - Adaptor Proteins, Signal Transducing/*chemistry MH - Animals MH - CARD Signaling Adaptor Proteins/*chemistry MH - Chromatography, Gel MH - Chromatography, Liquid MH - Cross-Linking Reagents MH - Humans MH - Immunoprecipitation MH - Macrophages/cytology MH - Mice MH - NLR Family, Pyrin Domain-Containing 3 Protein/*chemistry MH - Protein Multimerization MH - Staphylococcal Infections/*metabolism MH - Staphylococcus aureus/physiology MH - THP-1 Cells PMC - PMC5058782 MID - NIHMS819945 OTO - NOTNLM OT - Caspase-1 activity assay OT - Co-immunoprecipitation OT - Cross-linking OT - Inflammasome OT - NLR OT - Nod-like receptor OT - Oligomerization OT - Protein-protein interaction OT - Size exclusion chromatography EDAT- 2016/05/26 06:00 MHDA- 2017/12/14 06:00 PMCR- 2017/01/01 CRDT- 2016/05/26 06:00 PHST- 2016/05/26 06:00 [entrez] PHST- 2016/05/26 06:00 [pubmed] PHST- 2017/12/14 06:00 [medline] PHST- 2017/01/01 00:00 [pmc-release] AID - 10.1007/978-1-4939-3566-6_8 [doi] PST - ppublish SO - Methods Mol Biol. 2016;1417:131-43. doi: 10.1007/978-1-4939-3566-6_8.