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. 1992 Jun;33(6):738–742. doi: 10.1136/gut.33.6.738

Chemotactic activity of Helicobacter pylori sonicate for human polymorphonuclear leucocytes and monocytes.

H Nielsen 1, L P Andersen 1
PMCID: PMC1379327  PMID: 1624151

Abstract

The immunopathology of Helicobacter pylori associated active chronic gastritis, which is characterised by predominance of polymorphonuclear leucocyte infiltration, is largely unknown. To evaluate the role of bacterial components as inflammatory mediators ultracentrifuged sonicated preparations were made of clinical isolates of Helicobacter pylori. The crude sonicates were shown to exhibit chemotactic activity for human polymorphonuclear leucocytes and blood monocytes in a concentration dependent fashion. The potency was comparable with previously described bacterial derived cytotaxins. The cytotaxin(s) was non-dialysable and completely destroyed by proteinase. Heat treatment did not decrease the chemotactic activity, but in sonicate subjected to 100 degrees C for 15 minutes all activity disappeared after dialysis suggesting the breakdown of a larger protein to small fragments that are still biological active. By ammonium sulphate precipitation at increasing concentrations the cytotaxin(s) was selectively found in 10% ammonium sulphate saturation, and by further molecular gel separation the chemotactic activity was found in the molecular size range from 25 to 35 kDa. The demonstration of a polymorphonuclear leucocyte and monocyte cytotaxin from Helicobacter pylori sonicate may help in understanding the mucosal immune response in gastric inflammatory diseases.

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Selected References

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