Related Experiment Video
Updated: Jan 19, 2026
A Simple Approach to Induce Experimental Autoimmune Neuritis in C57BL/6 Mice for Functional and Neuropathological Assessments
Published on: November 9, 2017
An Experimental Approach to Rigorously Assess Paneth Cell α-Defensin (Defa) mRNA Expression in C57BL/6 Mice
Patricia A Castillo1, Eric B Nonnecke1, Daniel T Ossorio1
1Department of Microbiology & Immunology, School of Medicine, University of California Davis, Davis, CA, 95616, USA.
Abstract:
Abundant evidence from many laboratories supports the premise that α-defensin peptides secreted from Paneth cells are key mediators of host-microbe interactions in the small intestine that contribute to host defense and homeostasis. α-defensins are among the most highly expressed antimicrobial peptides at this mucosal surface in many mammals, including humans and mice; however, there is striking variation among species in the number and primary structure of α-defensin paralogs. Studies of these biomolecules in vivo are further complicated by striking variations between laboratory mouse strains. Herein, we report an experimental approach to determine with precision and specificity expression levels of α-defensin (Defa) mRNA in the small intestine of C57BL/6 mice through an optimized set of oligonucleotide primers for qRT-PCR assays and cloned cDNA plasmids corresponding to the Defa paralogs. This approach demonstrated marked differences in α-defensin expression in C57BL/6 mice with respect to proximal/distal anatomical location and developmental stage, which have not been described previously. These data underscore the importance of careful attention to method (primer choice, proximal vs. distal location, and developmental stage) in analysis of antimicrobial peptide expression and their impact.
Insights
Alpha-defensin (Defa) peptides are crucial for gut health. This study optimized methods to precisely measure Defa mRNA in mice, revealing significant expression differences based on location and age.
Area of Science:
- Immunology
- Microbiology
- Genetics
Background:
- Alpha-defensins (Defa) are key antimicrobial peptides secreted by Paneth cells in the small intestine.
- They play a vital role in host-microbe interactions, gut defense, and homeostasis.
- Significant species and strain variations exist in Defa paralogs, complicating in vivo studies.
Purpose of the Study:
- To develop a precise and specific method for quantifying alpha-defensin (Defa) mRNA expression in the small intestine of C57BL/6 mice.
- To investigate variations in Defa mRNA expression influenced by anatomical location and developmental stage.
Main Methods:
- Utilized an optimized set of oligonucleotide primers for quantitative reverse transcription polymerase chain reaction (qRT-PCR).
- Employed cloned cDNA plasmids corresponding to Defa paralogs for accurate quantification.
- Analyzed Defa mRNA expression in different small intestine regions (proximal/distal) and at various developmental stages.
Main Results:
- Demonstrated marked differences in Defa mRNA expression levels within the small intestine of C57BL/6 mice.
- Identified significant variations in expression related to proximal vs. distal anatomical location.
- Revealed previously undescribed differences in Defa expression according to developmental stage.
Conclusions:
- The optimized qRT-PCR approach provides precise quantification of Defa mRNA expression.
- Attention to methodological details, including primer selection, anatomical region, and developmental stage, is critical for accurate analysis of antimicrobial peptide expression.
- These findings highlight the dynamic nature of Defa expression and its importance in host defense.
More Related Videos
Related Concept Videos
07:30A Simple Approach to Induce Experimental Autoimmune Neuritis in C57BL/6 Mice for Functional and Neuropathological Assessments
07:15Social Defeat Stress Model for Adolescent C57BL/6 Male and Female Mice
08:03Myelin Oligodendrocyte Glycoprotein (MOG35-55) Induced Experimental Autoimmune Encephalomyelitis (EAE) in C57BL/6 Mice
09:50Experimental Methods for Testing the Effects of Neurotrophic Peptide, ADNF-9, Against Alcohol-induced Apoptosis during Pregnancy in C57BL/6 Mice
08:20Murine Distal Colostomy, A Novel Model of Diversion Colitis in C57BL/6 Mice
13:02Sagittal Plane Kinematic Gait Analysis in C57BL/6 Mice Subjected to MOG35-55 Induced Experimental Autoimmune Encephalomyelitis