Lipid profiles of Helicobacter pylori colony variants
Abstract:A phase variation in Helicobacter pylori has been previously described. In one phase the bacterium had a cell wall lipid content typical for gram-negative bacteria (HpL ), whereas in the other phase the bacterium was found to have a cell wall with increased amounts of lysophospholipids (HpS ). The conversion is spontaneous, but could also be induced by acid (HpSind ) and was associated with in vitro release of Vac A and urease. The purpose of the present study was to determine the full phospholipid content of the cell wall to indicate a molecular mechanism of the colony variation. There were no appreciable differences between the lipid profiles of HpS and HpSind , while there were major differences between HpL and the S -variant. In the S -variant, lysophospholipids constituted about 50% of the total phospholipids, as compared to less than 2% in the L -variant. The proportion of total and individual cholesteryl glucosides also showed considerable changes. HpL was dominated by the phosphate-linked cholesteryl glucoside (72%) while the acylated cholesteryl glucoside was the main cholesteryl glucoside of the S -variant (65%). Our results demonstrate a dramatic change in cell wall properties after acid induction and spontaneously in vitro, and suggest some molecular mechanisms for this variation from an in vitro non-virulent to a virulent variant.
Document Type: Original Article
Publication date: May 1, 2000