T and B lymphocyte populations in human normal lymph node, regional tumour lymph node and inflammatory lymph node

Area of Science:

• Immunology
• Oncology

Background:

• Lymphocyte subpopulations, including T cells and B cells, are crucial for immune responses.
• Understanding lymphocyte profiles in lymphoid tissues is essential for diagnosing and monitoring various diseases.

Purpose of the Study:

• To determine the T and B lymphocyte subpopulations in normal human lymph nodes.
• To investigate changes in lymphocyte profiles in lymph nodes draining tumors and inflammatory foci.
• To compare these profiles with peripheral blood lymphocyte populations.

Main Methods:

• Analysis of T and B lymphocyte subpopulations using flow cytometry.
• Characterization of Fc and C3 receptor-bearing lymphocytes.
• Comparison of lymphocyte profiles in lymph nodes, tonsils, and peripheral blood.

Main Results:

• Normal lymph nodes exhibit a consistent lymphocyte profile, similar to peripheral blood but with lower Fc and higher C3 receptor-bearing cells.
• Regional lymph nodes of cancer patients showed decreased T cells and increased B, Fc, and C3 cells.
• Tonsils and nodes draining inflammation showed an exaggerated version of the tumor-associated pattern, with reversed T and B cell ratios.
• Peripheral blood T and B lymphocyte percentages were unchanged in breast cancer patients.
• Tumor proximity to the draining lymph node influenced the lymphocyte profile.

Conclusions:

• Lymphoid structures exhibit distinct lymphocyte subsets compared to peripheral blood, suggesting functional heterogeneity.
• Cancer and inflammation significantly alter lymph node lymphocyte profiles, indicating a localized immune response.
• Peripheral blood lymphocyte counts may not reflect regional immune changes in cancer patients.