Interleukin (IL)-10 is a cytokine that inhibits production of other regulatory factors, including interferon gamma (IFN-gamma) and IL-2. A dimer of IL-10 is present in solution and is presumed to participate in receptor binding (1). IL-10 is a natural endogenous immunosuppressive cytokine that has been identified in human, murine, and other organisms. Human IL-10 (hIL-10) has high homology with murine IL-10 (mIL-10) as well as with an Epstein-Barr virus genome product BCRFI (2). IL-10 displays pleiotropic immunoregulatory properties. Human and murine IL-10 have a high amino acid sequence identity (ca. 73%) which includes the conservation of all four cysteine residues in human IL-10 and the first four out of five cysteine residues for murine IL-10. IL-10 is a highly alpha-helical protein containing two disulfide bonds, either one or both of which are critical for its structure and function (3).
Cytokine-cytokine receptor interaction
Jak-STAT signaling pathway
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