Characterization of nonlymphoid cells derived from rat peripheral lymph

Area of Science:

• Immunology
• Cell Biology

Background:

• Mesenteric lymphadenectomy in rats enables collection of intestine-derived peripheral lymph cells.
• These collected cells include nonlymphoid cells (NLC) with unique morphology and surface markers.

Purpose of the Study:

• To characterize the nonlymphoid cells (NLC) found in rat thoracic duct lymph after mesenteric lymphadenectomy.
• To investigate the origin, kinetics, and potential function of these NLC.

Main Methods:

• Mesenteric lymphadenectomy and thoracic duct cannulation in rats.
• Analysis of cell morphology, surface markers (using monoclonal antibodies), and functional assays (phagocytosis, pinocytosis).
• Kinetic studies with irradiation and tritiated thymidine, and bone marrow chimera studies.

Main Results:

• NLC exhibit heterogeneous morphology, express leukocyte-common antigen and Ia antigens, but lack typical lymphocyte/macrophage markers.
• NLC are derived from the small intestine, with precursors in lamina propria and Peyer's patches, and have a rapid turnover rate.
• NLC strongly stimulate mixed leukocyte reactions, suggesting a role similar to dendritic cells.

Conclusions:

• NLC in rat thoracic duct lymph share characteristics with mouse lymphoid dendritic cells.
• These cells are potent stimulators in mixed leukocyte reactions, likely functioning as accessory cells in lymph nodes.
• Further methods for NLC enrichment are discussed for functional analysis.