U937 cells are a model cell line used in biomedical research. They were isolated from the histiocytic lymphoma of a 37-year-old male patient  and are used to study the behaviour and differentiation of monocytes. U937 cells mature and differentiate in response to a number of soluble stimuli, adopting the morphology and characteristics of mature macrophages.
U937 cells are of the myeloid lineage and so secrete a large number of cytokines and chemokines either constitutively (e.g. IL-1 and GM-CSF) or in response to soluble stimuli. TNFα and recombinant GM-CSF independently promote IL-10 production in U937 cells.
- "U937 - Cytokines and Cells Online Pathfinder Encyclopaedia".
- Sundström C (May 1976). "Establishment and characterization of a human histiocytic lymphoma cell line (U-937)". Int. J. Cancer. 17 (5): 565–77. doi:10.1002/ijc.2910170504. PMID 178611.
- Lehmann MH (June 1998). "Recombinant human granulocyte-macrophage colony-stimulating factor triggers interleukin-10 expression in the monocytic cell line U937". Mol. Immunol. 35 (8): 479–485. doi:10.1016/S0161-5890(98)00043-1. PMID 9798652.
- Gebreselassie D (November 2006). "Sampling of major histocompatibility complex class I-associated peptidome suggests relatively looser global association of HLA-B*5101 with peptides.". Hum. Immunol. 67 (11): 894–906. doi:10.1016/j.humimm.2006.08.294. PMC . PMID 17145369.