Cell Communication

• Cytokines

• Chemokines – attract other leukocytes
• Colony-stimulating factors (CFSs) – direct maturation and differentiation of cells
• Interferons (IFNs) – activate anti-viral defenses
• Interleukins (ILs) – communication between leukocytes
• Tumor necrosis factors (TNFs) – kill tumor cells; initiate inflammation and apoptosis