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Comparative Study
. 1996 Aug;64(8):3397-400.
doi: 10.1128/iai.64.8.3397-3400.1996.

Stimulation of the ceramide pathway partially mimics lipopolysaccharide-induced responses in murine peritoneal macrophages

S A Barber  1 , G Detore, R McNally, S N Vogel
Affiliations
Comparative Study

Stimulation of the ceramide pathway partially mimics lipopolysaccharide-induced responses in murine peritoneal macrophages

S A Barber et al. Infect Immun. 1996 Aug.

Abstract

Recent studies have suggested that lipolysaccharide (LPS) stimulates cells by mimicking the second-messenger function of ceramide, a lipid generated in the cell by the action of sphingomyelinase (SMase). To examine this possibility further, we compared the abilities of LPS, SMase, and/or ceramide analogs to induce cytokine secretion, modulate gene expression, and induce endotoxin tolerance in macrophages. SMase and LPS induced secretion of tumor necrosis factor alpha (TNF-alpha) to comparable degrees; however, unlike LPS, SMase failed to stimulate detectable interferon activity. Cell-permeable analogs of ceramide induced the expression of many LPS-inducible genes; however, the expression of interferon-inducible protein 10 (IP-10) and interferon consensus sequence-binding protein (ICSBP) mRNAs was significantly lower than that induced by LPS. Both SMase-induced TNF-alpha secretion and LPS-induced TNF-alpha secretion were inhibited by pretreatment with a serine/threonine phosphatase inhibitor, calyculin A. Macrophages preexposed in vitro to LPS to induce a well-characterized state of endotoxin tolerance secreted little or no TNF-alpha upon secondary challenge with either LPS or SMase, whereas macrophages preexposed to SMase secreted high levels of TNF-alpha upon secondary stimulation with LPS or SMase. Collectively, these results suggest that ceramide activates a subset of LPS-induced signaling pathways in murine peritoneal exudate macrophages.

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