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A splice variant of ASC regulates IL-1beta release and aggregates differently from intact ASC

Kazuhiko Matsushita1, Michiko Takeoka, Junji Sagara

  • 1Department of Molecular Oncology, Institute on Aging and Adaptation, Graduate School of Medicine, Shinshu University, Negano 390-8621, Japan.

Mediators of Inflammation
|September 18, 2009
PubMed

Insights

A variant ASC protein lacking the proline and glycine-rich (PGR) domain activates procaspase-1 similarly but enhances IL-1beta excretion. The PGR domain regulates ASC

Area of Science:

  • Immunology
  • Molecular Biology
  • Cellular Biology

Background:

  • The apoptosis-associated speck-like protein containing a caspase recruit domain (ASC) is a key adaptor in apoptosis and innate immunity.
  • ASC mediates procaspase-1 activation, crucial for inflammatory responses.
  • ASC mRNA comprises three exons, encoding pyrin domain (PYD), proline and glycine-rich (PGR) domain, and caspase recruit domain (CARD).

Purpose of the Study:

  • To investigate the biochemical and biological differences between full-length ASC (fASC) and a variant ASC (vASC) lacking the PGR domain.
  • To determine the role of the PGR domain in ASC function, particularly in procaspase-1 activation and IL-1beta secretion.

Main Methods:

  • Identification and characterization of a variant ASC protein (vASC) lacking the PGR domain.
  • Comparative analysis of procaspase-1 activation by fASC and vASC.
  • Assessment of IL-1beta excretion efficiency mediated by fASC and vASC.
  • Structural analysis of fibrous aggregates formed by fASC and vASC.

Main Results:

  • Both fASC and vASC demonstrated comparable procaspase-1 activation capabilities.
  • vASC exhibited significantly higher efficiency in IL-1beta excretion compared to fASC.
  • Distinct structural differences were observed in the fibrous aggregates formed by fASC and vASC.

Conclusions:

  • The PGR domain is dispensable for procaspase-1 activation by ASC.
  • The PGR domain plays a significant role in regulating the molecular structure and biological activity of ASC, particularly IL-1beta secretion.
  • Understanding ASC variants can offer insights into modulating inflammatory pathways.

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