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Cyclophilin C-associated protein: a normal secreted glycoprotein that down-modulates endotoxin and proinflammatory responses in vivo.

Mouse cyclophilin C-associated protein (CyCAP) is a member of the scavenger-receptor cysteine-rich domain superfamily and is 69% identical to the human Mac-2 binding protein. Here, we show that CyCAP is a widely expressed secreted glycoprotein that modulates the host response to endotoxin. Gene-targeted CyCAP-deficient mice are more sensitive to the lethal effects of endotoxin. In response to endotoxin, CyCAP-deficient mice overproduced interleukin 12 and interferon-gamma systemically and tumor necrosis factor alpha locally; these are proinflammatory molecules that also promote T helper 1 responses. Furthermore, macrophages stimulated in vitro with endotoxin in serum deficient in CyCAP secreted more tumor necrosis factor alpha, supporting the proposal that CyCAP specifically down-modulates endotoxin signaling.

Pubmed ID: 10077627 RIS Download

Mesh terms: Animals | Endotoxins | Glycoproteins | Humans | Immunity, Innate | Inflammation | Macrophage Activation | Mice | Mice, Knockout

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Associated grants

  • Agency: NCI NIH HHS, Id: T32 CA009302
  • Agency: NCI NIH HHS, Id: 5T32 CA09302

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