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ASC Speck Formation as a Readout for Inflammasome Activation

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Part of the book series: Methods in Molecular Biology ((MIMB,volume 1040))

Abstract

All inflammasomes require the adapter protein apoptosis associated speck-like protein containing a CARD (ASC) for the activation of caspase-1. After inflammasome activation, ASC assembles into a large protein complex, which is termed “speck”. ASC specks can be observed as they reach a size of around 1 μm and in most cells only one speck forms upon inflammasome activation. Hence, ASC speck formation can be used as a simple upstream readout for inflammasome activation. Here, we describe a method for analyzing inflammasome activation by ASC speck visualization. First, we describe the generation of a clonal inflammasome reporter macrophage cell line overexpressing fluorescently tagged ASC. We then discuss stimulation conditions and the microscopic evaluation of ASC speck formation.

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References

  1. Masumoto J, Taniguchi S, Ayukawa K, Sarvotham H, Kishino T, Niikawa N, Hidaka E, Katsuyama T, Higuchi T, Sagara J (1999) ASC, a novel 22-kDa protein, aggregates during apoptosis of human promyelocytic leukemia HL-60 cells. J Biol Chem 274(48):33835–33838

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© 2013 Springer Science+business media, New York

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Stutz, A., Horvath, G.L., Monks, B.G., Latz, E. (2013). ASC Speck Formation as a Readout for Inflammasome Activation. In: De Nardo, C., Latz, E. (eds) The Inflammasome. Methods in Molecular Biology, vol 1040. Humana Press, Totowa, NJ. https://doi.org/10.1007/978-1-62703-523-1_8

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  • DOI: https://doi.org/10.1007/978-1-62703-523-1_8

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  • Publisher Name: Humana Press, Totowa, NJ

  • Print ISBN: 978-1-62703-522-4

  • Online ISBN: 978-1-62703-523-1

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