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Updated: Jun 13, 2026

Cholesterol Efflux Assay
07:54

Cholesterol Efflux Assay

Published on: March 6, 2012

IFN-lambda endocytosis and IFN-lambda responsive promoter activation are dependent on cholesterol

Okki Cho1, Seung Ho Hong, Jung Sik Kim

  • 1Department of Microbiology, Ajou University School of Medicine, Youngtongku Wonchondong San 5, Suwon 442-749, Republic of Korea.

Cytokine
|April 14, 2010
PubMed

Insights

Interferon-lambdas (IFN-lambdas) are internalized by cells, a process crucial for their function. Inhibiting this endocytosis impacts antiviral gene activation, suggesting a role in immunity.

Area of Science:

  • Immunology
  • Cell Biology
  • Virology

Background:

  • Receptor endocytosis influences signaling for many immunomodulatory molecules.
  • The endocytosis of interferon-lambdas (IFN-lambdas) and its functional consequences remain largely uncharacterized.

Purpose of the Study:

  • To investigate the mechanism of IFN-lambda internalization.
  • To determine the impact of IFN-lambda endocytosis on its biological function and downstream signaling.

Main Methods:

  • Utilized HepG2 cells to study IFN-lambda uptake.
  • Employed cholesterol depletion and genetic inhibition to block endocytosis pathways.
  • Assessed the activation of IFN-lambda responsive promoters.

Main Results:

  • IFN-lambda internalization occurs via a cholesterol-dependent, dynamin-independent, and Rho GTPase-independent pathway.
  • Inhibition of IFN-lambda endocytosis through cholesterol depletion significantly suppressed the activation of IFN-lambda responsive promoters.
  • These findings highlight a novel mechanism regulating IFN-lambda signaling.

Conclusions:

  • IFN-lambda endocytosis is an active process involved in regulating its function.
  • This endocytic pathway plays a role in antiviral gene induction, impacting innate antiviral immunity.

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