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Caspase-2 associates with FAN through direct interaction and overlapping functionality

Jeremy Forsberg1, Xinge Li1, Aleksey V Zamaraev2

  • 1Division of Toxicology, Institute of Environmental Medicine, Karolinska Institutet, Stockholm, Sweden.

Biochemical and Biophysical Research Communications
|April 6, 2018
PubMed

Insights

Researchers discovered a direct interaction between caspase-2 and the factor associated with neutral sphingomyelinase activation (FAN). This finding reveals new roles for caspase-2 in non-apoptotic cellular functions like IL-6 release and cell migration.

Area of Science:

  • Cell Biology
  • Molecular Biology
  • Biochemistry

Background:

  • Caspase-2 is involved in various cellular processes.
  • Identifying interacting factors of caspase-2 is crucial for understanding its functions.
  • Factor associated with neutral sphingomyelinase activation (FAN) is linked to ceramide production, cell migration, IL-6 release, and vesicular homeostasis.

Purpose of the Study:

  • To identify novel interacting partners of caspase-2.
  • To investigate the functional implications of caspase-2 interaction with FAN.
  • To explore caspase-2's role in non-apoptotic cellular mechanisms.

Main Methods:

  • Yeast two-hybrid screening to identify protein-protein interactions.
  • Co-immunoprecipitation to confirm direct interaction between caspase-2 and FAN.
  • Stable suppression of caspase-2 expression in HEK293T and HeLa cells.
  • Lipidomics analysis to assess ceramide production.
  • Assays to evaluate IL-6 release, cell migration, and vesicular homeostasis.

Main Results:

  • A direct interaction between caspase-2 and FAN was confirmed.
  • Caspase-2 was not involved in ceramide species generation.
  • Caspase-2 suppression led to deregulation of IL-6 release.
  • Caspase-2 suppression affected vesicular size and delayed cell relocation.
  • These findings support an association between caspase-2 and FAN in cellular processes.

Conclusions:

  • FAN is a novel interacting factor of caspase-2.
  • Caspase-2 plays a role in non-apoptotic cellular functions, including IL-6 regulation, vesicular homeostasis, and cell migration.
  • This study expands the known functions of caspase-2 beyond apoptosis.
Keywords:
Caspase-2Cell migrationCeramide specieFANLysozyme

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