Related Experiment Video
Updated: Aug 11, 2026
qPCR Is a Sensitive and Rapid Method for Detection of Cytomegaloviral DNA in Formalin-fixed, Paraffin-embedded Biopsy Tissue
Published on: July 10, 2014
Cytokine mRNA quantification in histologically normal canine duodenal mucosa by real-time RT-PCR
I R Peters1, C R Helps, E L Calvert
1School of Clinical Veterinary Science, University of Bristol, Langford House, Langford, Bristol BS40 5DU, UK. i.r.peters@bristol.ac.uk
Insights
This study developed real-time PCR assays to measure cytokine messenger RNA (mRNA) in dog intestines. These assays reveal the normal cytokine mRNA profile in canine duodenal mucosa, crucial for studying canine inflammatory bowel disease (IBD).
Area of Science:
- Veterinary Immunology
- Molecular Biology
- Gastroenterology
Background:
- CD4(+) T helper cells regulate intestinal immunity via cytokine secretion.
- Human inflammatory bowel diseases (IBD) show altered cytokine profiles.
- Canine IBD cytokine research is limited by a lack of specific antibodies.
Purpose of the Study:
- To develop and validate TaqMan real-time RT-PCR assays for quantifying canine cytokine mRNA in intestinal mucosa.
- To establish a baseline cytokine mRNA expression profile in normal canine duodenal tissue.
- To provide a foundation for future research into canine enteropathies and cytokine expression.
Main Methods:
- Development of TaqMan real-time RT-PCR assays for ten canine cytokines (IL-2, IL-4, IL-5, IL-6, IL-10, IL-12, IL-18, IFN-gamma, TNF-alpha, TGF-beta).
- Quantification of cytokine mRNA in duodenal mucosal samples from healthy dogs (n=8).
- Analysis of relative abundance of cytokine mRNA transcripts.
Main Results:
- IL-18, TGF-beta, and TNF-alpha were the most abundant cytokine mRNA transcripts in normal canine duodenal mucosa.
- IL-10 and IFN-gamma mRNA were approximately 10-fold less abundant.
- IL-2, IL-4, IL-5, IL-6, and IL-12 mRNA were the least abundant, with some samples showing no detectable levels.
Conclusions:
- Established real-time PCR assays provide accurate quantification of canine cytokine mRNA.
- Defined baseline cytokine mRNA levels in healthy canine duodenal mucosa.
- These methods will enable further investigation of cytokine roles in canine inflammatory bowel disease and other conditions.
Abstract:
CD4(+) T helper cells are important for the regulation of immune responses in the intestinal mucosa and they exert their effects through the secretion of pro-inflammatory and immunomodulatory cytokines. Human patients with inflammatory bowel diseases (IBD) such as Crohn's disease and ulcerative colitis have alterations in the normal intestinal cytokine profile. These cytokine abnormalities have been shown at both the protein and messenger RNA (mRNA) level. The role that mucosal cytokines play in the pathogenesis of canine IBD has only been investigated using semi-quantitative reverse transcriptase polymerase chain reaction (RT-PCR) analysis of gut tissue, as cytokine antisera are not available for this species. Real-time RT-PCR has been recognised to be a more accurate and sensitive method of quantifying mRNA transcripts, so in this study TaqMan real-time RT-PCR assays for the quantification of mRNA encoding IL-2, IL-4, IL-5, IL-6, IL-10, IL-12, IL-18, IFN-gamma, TNF-alpha and TGF-beta in canine intestinal mucosa were developed. The amount of these templates was quantified in normal canine duodenal mucosa (n = 8). IL-18, TGF-beta and TNF-alpha were found to be the most abundant transcripts, with IL-10 and IFN-gamma present at levels approximately 10-fold less. IL-2, IL-4, IL-5, IL-6 and IL-12 were the least abundant templates, with some RNA samples having no detectable mRNA copies. The methods developed in this study will form the basis of further work investigating the expression of mRNA encoding cytokines in mucosa from dogs with chronic enteropathies. In addition, these real-time PCR assays can also be used for the quantification of canine cytokine mRNA in other diseases.
