Abstract
Vascular thrombosis and tissue infarction is a principal lesion in Haemophilus somnus septicemia known also as thrombotic meningoencephalitis. This study was undertaken to examine whether tumor necrosis factor-alpha (TNF-alpha) can influence the adherence of H. somnus to cultured bovine aortic endothelial cells (BAEC). Confluent BAEC were exposed to 0-100 nM of human recombinant TNF-alpha for 12-48 h. Suspensions of different strains of H. somnus (approximately 1.5-3 x 10(8) labelled with [methyl-3H]-thymidine, were added to BAEC and incubated for 1.5 h. Initial studies with one pathogenic (P) strain and one non-pathogenic (NP) strain revealed that both strains adhered to normal endothelial cells but minimally to subendothelial matrix remaining after removal of BAEC. Adherence to BAEC was reduced by an excess of unlabelled H. somnus of the same strain. Adherence was enhanced for both strains by exposure of BAEC to TNF-alpha in a manner that increased with TNF-alpha concentration and with duration of exposure to TNF-alpha prior to addition of bacteria. A survey of adherence of six live P strains and six NP strains demonstrated considerable variation but no difference in adherence between P and NP strains to normal or to TNF-alpha-stimulated BAEC. However, TNF-alpha consistently increased adhesion of each strain to BAEC. Both P and NP strains caused more severe cytotoxic changes in TNF-alpha-treated BAEC. Tumor necrosis factor-alpha also increased adhesion of formalin-killed bacteria of P and NP strains.(ABSTRACT TRUNCATED AT 250 WORDS)
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