Differential regulation of natural killer cells by tumor necrosis factor receptors 1 and 2

Differential Tumor Surveillance by Natural Killer (Nk) and Nkt Cells

Natural tumor surveillance capabilities of the host were investigated in six different mouse tumor models where endogenous interleukin (IL)-12 does or does not dictate the efficiency of the innate immune response. Gene-targeted and lymphocyte subset-depleted mice were used to establish the relative importance of natural killer (NK) and NK1.1(+) T (NKT) cells in protection from tumor initiation ...

Tumor necrosis factor: receptors on hematopoietic cells.

Tumor necrosis factor (TNF) is a monokine that is cytotoxic/cytostatic for a variety of tumor cells and has multiple effects on normal cells. We demonstrate that normal and malignant human myeloid cells express a single class of high-affinity receptors (400 to 1,900 per cell, KD 20 to 90 pmol/L) for TNF. Mitogen-stimulated lymphocytes have a similar number of TNF receptors, whereas resting lymp...

Tumor necrosis factor receptors in HeLa cells and their regulation by interferon-gamma.

Incubation of HeLa cell cultures with human interferon-gamma (IFN-gamma) increased the binding of radioiodinated human tumor necrosis factor (TNF) to specific cell surface receptors (TNF-R). IFN-gamma also produced a proportionate increase in receptor-mediated endocytosis of TNF. TNF-R expression was significantly increased after 6 h of exposure to IFN-gamma (100 units/ml), and it remained elev...

Natural killer cells and cancer: regulation by the killer cell Ig-like receptors (KIR).

Natural killer (NK) cells are innate immune effector cells that make up approximately 10-15% of the peripheral blood lymphocytes in humans and are primarily involved in immunosurveillance to eliminate transformed and virally-infected cells. They were originally defined by their ability to spontaneously eliminate rare cells lacking expression of class I major histocompatibility complex (MHC-I) s...

CIRCULATING SOLUBLE TUMOR NECROSIS FACTOR RECEPTORS, INTERLEUKIN-2 RECEPTORS, TUMOR NECROSIS FACTOR a, AND INTERLEUKIN-6 LEVELS IN RHEUMATOID ARTHRITIS