Cervical duct cannulation in sheep for collection of afferent lymph dendritic cells from head tissues

Area of Science:

• Immunology
• Surgical techniques
• Animal models

Background:

• Collecting immune cells from head tissues is crucial for understanding mucosal immunity.
• Existing methods may not fully capture the dynamic immune cell trafficking under physiological conditions.
• Dendritic cells (DCs) play a key role in initiating immune responses in the head and neck region.

Purpose of the Study:

• To establish a pseudo-afferent cervical lymph-duct cannulation technique in a sheep model.
• To enable the collection of large quantities of immune cells, including dendritic cells (DCs), from head tissues.
• To facilitate the study of immune cell dynamics and antigen transport from oro-nasal mucosae.

Main Methods:

• The technique involves three surgical steps: head lymph node removal, cervical lymph duct catheterization, and lymph-cell subset collection.
• This protocol is performed on a sheep model, requiring 2 months between lymph node removal and catheterization.
• The procedure demands experienced postdoctoral researchers due to its challenging nature (1 in 3 success rate).

Main Results:

• The pseudo-afferent cannulation allows for the collection of large volumes of lymph cells under physiological conditions.
• Significant quantities of dendritic cells (DCs) of various subtypes (up to 8 million per overnight collection) are obtained.
• The method also yields substantial numbers of other trafficking leukocytes, providing a rich source for immunological studies.

Conclusions:

• Pseudo-afferent cervical lymph-duct cannulation in sheep is a viable, albeit challenging, method for collecting immune cells from head tissues.
• This technique provides a valuable tool for studying dendritic cell subsets, immunomodulation, and antigen transport from oro-nasal tissues.
• The collected lymph cells offer insights into immune signaling and dynamic changes within the head and neck immune system.