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Identification of a Novel Tumor Necrosis Factor αCachectin From the Livers of Burned and Infected Rats

Christopher Keogh; Yuman Fong, MD; Michael A. Marano, MD; Sophie Seniuk; Wei He, MD; Annabel Barber, MD; Joseph P. Minei, MD; Diane Felsen, PhD; Stephen F. Lowry, MD; Lyle L. Moldawer, PhD
Arch Surg. 1990;125(1):79-85. doi:10.1001/archsurg.1990.01410130085011.
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• Tumor necrosis factor α (TNF-α)/cachectin is a monocyte/macrophage-derived cytokine implicated as a proximal mediator of many of the catastrophic host responses to infection or endotoxin. However, circulating levels of TNF-α/cachectin have only been episodically detected in hospitalized patients with life-threatening bacterial infections. In the present report, increased quantities of immune-reactive TNF-α/cachectin were recovered from the livers of rats 3 days following a lethal burn and infection. Two species of TNF-α/cachectin were detected, one of approximately 29 kd and the other 17 kd, as determined by sodium dodecyl sulfate-polyacrylamide gel electrophoresis. In murine peritoneal macrophages and rat Kupffer cells stimulated in vitro with endotoxin, a 29-kd cell-associated and 17-kd secreted form were also detected. We conclude that the increased appearance in vivo of a 29-kd form of TNF-α/cachectin from the livers of lethally burned and infected rats represents a novel cell-associated form of the protein.

(Arch Surg. 1990;125:79-85)


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