[Analysis of cytokine receptor function by gene manipulation]

T Taga1

  • 1Department of Molecular Cell Biology, Tokyo Medical and Dental University.

Insights

Gene manipulation in mice revealed the in vivo roles of gp130, a shared signal transducer for cytokine receptors. Studies using deficient and activated gp130 mouse models illuminate cytokine signaling pathways.

Area of Science:

  • Immunology
  • Molecular Biology
  • Genetics

Context:

  • Cytokines play crucial roles in physiological and pathological processes.
  • Cytokine signaling is characterized by functional pleiotropy and redundancy.
  • Shared receptor components, like gp130, contribute to cytokine redundancy.

Purpose:

  • To review studies utilizing gene manipulation techniques to investigate the in vivo roles of the signal transducer gp130.
  • To examine mouse models with gp130 deficiency, constitutive activation, or dominant-negative forms.
  • To synthesize findings from gp130-related receptor and ligand knockout mice.

Summary:

  • Gene manipulation in mice has been instrumental in dissecting cytokine receptor functions.
  • Mouse models deficient for gp130 or exhibiting altered gp130 signaling provide insights into its physiological and pathological roles.
  • Analysis of these models, alongside studies on related receptors and ligands, elucidates the complex network of cytokine signaling.

Impact:

  • Provides a comprehensive overview of gp130's in vivo functions through genetic manipulation studies.
  • Highlights the importance of gp130 as a central mediator in various cytokine-driven biological processes.
  • Offers valuable information for understanding cytokine-related diseases and developing targeted therapies.

Related Concept Videos

In-vitro Mutagenesis01:16

In-vitro Mutagenesis

To learn more about the function of a gene, researchers can observe what happens when the gene is inactivated or “knocked out,” by creating genetically engineered knockout animals. Knockout mice have been particularly useful as models for human diseases such as cancer, Parkinson’s disease, and diabetes.
Conservative Site-specific Recombination and Phase Variation02:53

Conservative Site-specific Recombination and Phase Variation

Because the DNA segments are cut and reorganized in a direction-specific manner, site-specific recombination has emerged as an efficient genetic engineering technique. Flippase and Cyclization recombinases or Flp and Cre, respectively, are two members of the tyrosine recombinase family derived from bacteriophages, that are used to mediate site-specific DNA insertions, deletions, and targeted expression of proteins in mammalian cell lines.
The recognition sites for Cre recombinase called LoxP...
Receptor Downregulation in MVBs01:15

Receptor Downregulation in MVBs

Multivesicular bodies (MVBs) are mature endosomes that sort ubiquitinated proteins and then fuse with lysosomes to degrade the sorted proteins. Epidermal growth factor (EGF) and its receptor (EGFR) form a complex that can be internalized through endocytosis, sorted into an MVB, and later degraded.
The EGFR can initiate signaling pathways that  lead to cell proliferation, migration, and differentiation. Overexpression of EGFR  stimulates cells to proliferate. Excessive  EGFR activation may...
The JAK-STAT Signaling Pathway01:20

The JAK-STAT Signaling Pathway

Several cytokine receptors have tightly bound Janus kinase or JAK proteins attached at their cytosolic tail. Small signaling molecules such as cytokines, growth hormones, or prolactins bind to the cytokine receptors and initiate their dimerization. The dimerization brings the cytosolic JAKs together that trans-phosphorylate and activates each other. The activated JAKs now phosphorylate cytosolic tails of the cytokine receptors, which serve as binding sites for adaptor proteins such as  SH2...