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|95||IL-6, but not TNF-alpha, increases plasma YKL-40 in human subjects.|
Nielsen AR; Plomgaard P; Krabbe KS; Johansen JS; Pedersen BK
Cytokine 2011; 55(1): 152-5
PubMed ID: 21478032
Plasma levels of YKL-40 are elevated in patients with systemic infection, inflammatory disorders and cancer. Both monocytes/macrophages, neutrophils, and cancer cells have the capacity to produce YKL-40, but the regulation during the inflammatory response is unknown. To study the possible role of interleukin-6 (IL-6) and tumor necrosis factor (TNF)-alpha in the regulation of YKL-40 plasma levels, we included healthy men, who received either recombinant human (rh)IL-6 (n=6), rhTNF-alpha (n=8) or vehicle (n=7) for 3h. The plasma levels of IL-6 and TNF-alpha reached approximately 150 and approximately 18 pg/ml, respectively, during the infusions. Following the IL-6 infusion, the plasma level of YKL-40 increased from approximately 30 to approximately 57 ng/ml (p<0.05) at 24h, and returned to normal values after 48 h. The plasma level of YKL-40 did not change during TNF-alpha infusion or infusion of vehicle. These data demonstrate that IL-6, but not TNF-alpha, has a key-role in the regulation of plasma YKL-40 levels during inflammation. Copyright (c) 2011 Elsevier Ltd. All rights reserved.