Canine mesenteric lymph nodes (MLNs) characterization by sc-RNAseq: insights compared to human and mouse MLNs

Area of Science:

• Veterinary immunology
• Gastrointestinal mucosal immunity
• Canine immunology

Background:

• Oral vaccines are gaining interest in human and veterinary medicine.
• Canine oral vaccines are emerging, necessitating a deeper understanding of their immune mechanisms.
• Mesenteric lymph nodes (MLNs) and Peyer's patches (PPs) are vital for gastrointestinal immune responses, but canine MLN data is limited.

Purpose of the Study:

• To characterize the immune cell populations within canine mesenteric lymph nodes (MLNs).
• To explore subpopulations of B and T lymphocytes in canine MLNs using advanced sequencing techniques.
• To establish a foundational atlas of canine MLN immune cells for future research.

Main Methods:

• Collection of MLN samples from healthy dogs.
• Flow cytometry for immune cell characterization.
• Single-cell RNA sequencing (scRNA-seq) for detailed subpopulation analysis.

Main Results:

• Detailed characterization of the main immune cell populations in canine MLNs.
• Identification of specific subpopulations, particularly B and T lymphocytes.
• Construction of a predictive atlas of canine MLN immune cells.

Conclusions:

• This study provides the first comprehensive characterization of canine MLNs.
• The generated atlas offers valuable insights into canine gastrointestinal mucosal immunity.
• Findings are crucial for advancing the development and efficacy of canine oral vaccines.