Shemi D, Kaplanski J. Involvement of PGE2 and TNF-alpha in LPS-tolerance in rat glial primary cultures.
Prostaglandins Leukot Essent Fatty Acids 2005;
73:385-9. [PMID:
16125920 DOI:
10.1016/j.plefa.2005.06.001]
[Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/15/2004] [Revised: 06/05/2005] [Accepted: 06/10/2005] [Indexed: 11/29/2022]
Abstract
The effect of repeated exposure of primary newborn rat brain glial cultures to the endotoxin lipopolysaccharide (LPS), a component of Escherichia coli membrane, on PGE(2) and TNF-alpha production was examined. PGE(2) production by cell cultures exposed to LPS at a dose of 5 microg/ml, 4 and 24 h after initial exposure did not differ from PGE(2) production by the same cultures 4 and 24 h after the first exposure to the same dose of LPS. TNF-alpha production was significantly lower with the second exposure as compared with the production by the same culture, exposed to the same dose of LPS, examined 4 and 24 h after the first exposure. We concluded that endotoxin tolerance in our culture model is associated with reduced secretion of TNF-alpha, caused by the initial exposure to LPS, while PGE(2) production remained unchanged.
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