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Updated: Jun 7, 2026

Activation and Measurement of NLRP3 Inflammasome Activity Using IL-1β in Human Monocyte-derived Dendritic Cells
09:04

Activation and Measurement of NLRP3 Inflammasome Activity Using IL-1β in Human Monocyte-derived Dendritic Cells

Published on: May 22, 2014

Activation of the NLRP3 inflammasome by intracellular poly I:C

Jayant V Rajan1, Sarah E Warren, Edward A Miao

  • 1Institute for Systems Biology, Seattle, WA 98103, USA.

FEBS Letters
|October 26, 2010
PubMed

Insights

The inflammasome detects RNA viruses by sensing double-stranded RNA (dsRNA) through endosomal acidification, independent of TLR3 and MDA5 sensors. This finding clarifies how viral dsRNA activates the NLRP3 inflammasome, promoting immune responses.

Area of Science:

  • Immunology
  • Virology
  • Molecular Biology

Background:

  • The inflammasome is crucial for detecting RNA viruses and secreting IL-1β and IL-18.
  • The precise mechanisms by which RNA viruses are detected by the inflammasome are not fully understood.
  • Cytosolic double-stranded RNA (dsRNA) is a key intermediate in the replication of many RNA viruses.

Purpose of the Study:

  • To investigate the mechanism by which cytosolic dsRNA activates the inflammasome.
  • To determine if the NLRP3 inflammasome is involved in dsRNA detection.
  • To elucidate the role of endosomal acidification in dsRNA-mediated inflammasome activation.

Main Methods:

  • Transfection of cells with the dsRNA analogue poly I:C.
  • Assessment of inflammasome activation, specifically NLRP3.
  • Investigation of the requirement for endosomal acidification in the activation pathway.
  • Evaluation of the independence of this pathway from TLR3 and MDA5 sensors.

Main Results:

  • Poly I:C transfection activates the NLRP3 inflammasome.
  • This activation is dependent on endosomal acidification.
  • The dsRNA-mediated NLRP3 inflammasome activation is independent of TLR3 and MDA5.
  • A novel pathway for dsRNA detection by the NLRP3 inflammasome was identified.

Conclusions:

  • Cytosolic dsRNA, a viral replication intermediate, can activate the NLRP3 inflammasome.
  • Endosomal acidification is a critical step in this dsRNA detection pathway.
  • This mechanism provides insight into how viral infections trigger inflammasome-mediated immune responses.

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