Lymph node reticular cells and macrophages

Lymph node reticular cells and macrophages are integral components of the lymphatic system's structural and immunological framework. Fibroblastic reticular cells (FRCs) create a specialized conduit system that regulates the flow of lymph and small molecules while secreting chemokines such as CCL19 and CCL21 to orchestrate the movement of immune cells (Link et al., Nature Immunology, 2007). Macrophages, particularly those in the subcapsular sinus, serve as vital filters that trap pathogens and antigens from the lymph, facilitating their presentation to B cells and initiating adaptive immunity (Junt et al., Nature, 2007). In clinical practice, these cells are targeted by imaging agents like Technetium Tc 99m tilmanocept, which binds to the mannose receptor (CD206) on macrophages for sentinel lymph node mapping in cancer patients (Surasi et al., Journal of Nuclear Medicine, 2015). This cellular environment is also a focal point for the development of vaccines and lymphotropic drug delivery systems aimed at modulating regional immune responses or treating metastatic disease (Liu et al., Signal Transduction and Targeted Therapy, 2021). Because this entry describes a complex tissue microenvironment rather than a single molecular entity, it is not classified as a standard therapeutic target in molecular pharmacology. However, understanding the interaction between these cells is crucial for advancing lymphatic-targeted therapies and monitoring disease progression in oncology and immunology (Acta Pharmaceutica Sinica B, 2021).

Other names

Lymph node stroma and myeloid cellsLymph node fibroblastic reticular cells and macrophagesLymph node sinus macrophages and reticular meshwork

Binding to cell-surface receptors (e.g., CD206) or passive uptake via phagocytosis and lymphatic drainage