Related Experiment Video

Updated: Jul 1, 2026

Using an Automated Cell Counter to Simplify Gene Expression Studies: siRNA Knockdown of IL-4 Dependent Gene Expression in Namalwa Cells
10:34

Using an Automated Cell Counter to Simplify Gene Expression Studies: siRNA Knockdown of IL-4 Dependent Gene Expression in Namalwa Cells

Published on: April 14, 2010

Expression of canine interleukin-4 in canine chondrocytes inhibits inflammatory cascade through STAT6

P Sivaramakrishna Rachakonda1, Muhammad F Rai, Kizzie Manning

  • 1Institute of Immunology and Molecular Biology, Berlin Veterinary Faculty, Freie Universität Berlin, House 18, Philippstrasse 13, D-10115 Berlin, Germany.

Cytokine
|September 16, 2008
PubMed

Insights

Canine interleukin-4 (cIL-4) expressed in canine articular chondrocytes suppresses inflammatory mediators. This suggests cIL-4, potentially via STAT6 signaling, offers therapeutic potential for canine inflammatory joint diseases.

Area of Science:

  • Immunology
  • Molecular Biology
  • Veterinary Medicine

Background:

  • Interleukin-4 (IL-4) is a key cytokine with diverse biological functions.
  • Understanding canine IL-4 (cIL-4) in articular chondrocytes is crucial for canine joint health.
  • Pro-inflammatory cytokines contribute to cartilage degradation in canine arthritis.

Purpose of the Study:

  • To investigate the mammalian expression of cIL-4 in canine articular chondrocytes (CAC).
  • To assess the anti-inflammatory effects of expressed cIL-4 on pro-inflammatory mediators in CAC.
  • To explore the role of STAT6 signaling in mediating the anti-inflammatory actions of cIL-4.

Main Methods:

  • Transfection of cIL-4 into CAC.
  • Stimulation of transfected CAC with canine recombinant IL-1beta and TNFalpha.
  • Detection and quantification of cIL-4 protein via Western blot and ELISA.
  • Measurement of pro-inflammatory cytokines, enzyme mediators, and nitrite production using qRT-PCR and calorimetric assays.
  • Identification and partial sequencing of canine STAT6.

Main Results:

  • Canine IL-4 was successfully expressed in CAC as a 17kD protein.
  • Expressed cIL-4 significantly inhibited pro-inflammatory cytokines and mediators induced by IL-1beta and TNFalpha.
  • STAT6 was exclusively detected in cIL-4 transfected CAC, indicating its involvement in the anti-inflammatory pathway.
  • Canine STAT6 was identified and partially sequenced.

Conclusions:

  • Canine IL-4 expressed in CAC is biologically active and possesses potent anti-inflammatory properties in vitro.
  • cIL-4 effectively suppresses key inflammatory mediators relevant to canine joint disease.
  • STAT6 signaling is likely the primary mechanism through which cIL-4 exerts its anti-inflammatory effects in CAC.
  • This study provides a foundation for exploring cIL-4 as a therapeutic agent for canine inflammatory conditions.

Related Concept Videos

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...
T Cell Types and Functions01:24

T Cell Types and Functions

When T cells with CD4 markers are activated, they give rise to two types of effector cells: helper T cells and regulatory T cells. Meanwhile, T cells with CD8 markers differentiate into effector cytotoxic T cells. The differentiation of CD4 T cells into helper T cell subsets, such as Th1, Th2, and Th17 cells, is dependent on the antigen type, antigen-presenting cell, and regulatory cytokines.
Th1 cells stimulate dendritic cells to express necessary co-stimulatory molecules on their surfaces for...
NF-κB-dependent Signaling Pathway02:26

NF-κB-dependent Signaling Pathway

The transcription factor NF-κB was discovered in 1986 in the lab of Nobel laureate Professor David Baltimore, for its interaction with the immunoglobulin light chain enhancer in B-cells. After more than three decades of study, it is now evident that NF-κB regulates the expression of over 100 genes. Most of these genes play an essential role in the innate and adaptive immune responses as well as the inflammatory responses of animals.
NF-κB-dependent Signaling Mechanism
The heterodimer of NF-κB...
TGF - β Signaling Pathway01:16

TGF - β Signaling Pathway

The TGF-β signaling pathway regulates cell growth, differentiation, adhesion, motility, and development. TGF-β ligands that induce TGF-β signaling are synthesized in their latent form. Several proteases or cell surface receptors such as integrins act upon the latent form, releasing the active ligand. There are three types of mammalian TGF-βs: (TGF-β1, TGF-β2, and TGF-β3) that bind as homodimers or heterodimers to TGF-β receptors. The TGF-β receptors are of three kinds RI, RII, and RIII. The RI...
Inflammatory Response01:28

Inflammatory Response

An inflammatory response is a localized, nonspecific immune reaction that occurs when a tissue is injured. It is characterized by redness, swelling, heat, and pain, which are commonly called the cardinal signs and symptoms of inflammation. Inflammation can sometimes result in a loss of function.
Inflammation can be triggered by various stimuli, such as impact, abrasion, chemical irritation, infections, and extreme hot or cold temperatures. These can damage cells and connective tissue fibers,...