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SorLA and CLC:CLF-1-dependent Downregulation of CNTFR&#945; as Demonstrated by Western Blotting, Inhibition of Lysosomal Enzymes, and Immunocytochemistry
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Characterization of LRRFIP1.

Rachel Arakawa1, Asen Bagashev, Li Song

  • 1The Children's Hospital of Philadelphia, The University of Pennsylvania School of Medicine, 3615 Civic Center Boulevard, Philadelphia, PA 19104, USA.

Biochemistry and Cell Biology = Biochimie Et Biologie Cellulaire
|November 25, 2010
PubMed
Summary
This summary is machine-generated.

LRRFIP1 protein regulates toll-like receptor (TLR) signaling. This study found LRRFIP1 is phosphorylated and moves to lysosomes upon immune stimulation, suggesting a role in innate immunity.

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Published on: December 3, 2014

Area of Science:

  • Immunology
  • Cell Biology
  • Molecular Biology

Background:

  • LRRFIP1 is a known regulator of toll-like receptor (TLR) pathway signaling.
  • Its specific regulation and function remain largely uncharacterized.
  • Monocytic cell lines expressing diverse TLRs were used to study LRRFIP1.

Purpose of the Study:

  • To investigate the biochemical properties and regulation of LRRFIP1.
  • To understand how LRRFIP1 expression and localization are affected by various stimuli.
  • To elucidate the role of LRRFIP1 phosphorylation in immune responses.

Main Methods:

  • Over-expression of full-length LRRFIP1.
  • Analysis of LRRFIP1 expression in monocytic cells upon stimulation with lipopolysaccharide (LPS), phorbol myristate acetate (PMA), nicotine, influenza, and serum starvation.
  • Detection and analysis of LRRFIP1 serine phosphorylation following stimulation with poly I:C and nicotine.
  • Examination of LRRFIP1 intracellular localization in response to double-stranded RNA (dsRNA).

Main Results:

  • Over-expression of LRRFIP1 enhanced responses to LPS.
  • LRRFIP1 expression was not altered by LPS or PMA but was upregulated by nicotine, influenza infection, and serum starvation.
  • Serine phosphorylation of LRRFIP1 was detected and modulated by poly I:C and nicotine.
  • LRRFIP1 colocalized with dsRNA within monocyte lysosomal structures.

Conclusions:

  • LRRFIP1 is phosphorylated in response to immunological stimuli.
  • LRRFIP1 is directed to lysosomal structures upon encountering dsRNA.
  • These findings suggest LRRFIP1 plays a role in innate immune signaling pathways, particularly within lysosomes.