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Advances in freeze-fracture replication for assessing immune interactions between Helicobacter pylori and human neurophils
Linköping University, Department of Molecular and Clinical Medicine, Medical Microbiology. Linköping University, Faculty of Health Sciences.
(English)Manuscript (preprint) (Other academic)
Abstract [en]

A freeze-fracture replica labeling method adapted for studies of bacterial envelopes was recently introduced. This report describes a further development of this detergent-digested freeze-fracture replica labeling technique, enabling direct visualization of bacteria-host interaction, specifically between the gastric pathogen Helicobacter pylori and human neutrophils. The phagocytic process performed by the neutrophilic leukocytes represents a crucial element of the host defense system against invading microorganisms. The present methodology can be used as a tool that allows characterization of the molecular and ultrastructural events that take place between pathogenic microbes and professional phagocytes.

National Category
Medical and Health Sciences
URN: urn:nbn:se:liu:diva-84621OAI: diva2:560769
Available from: 2012-10-15 Created: 2012-10-15 Last updated: 2012-10-15Bibliographically approved
In thesis
1. Characterisation of surface traits of Helicobacter pylori and their role in the infectious process
Open this publication in new window or tab >>Characterisation of surface traits of Helicobacter pylori and their role in the infectious process
2003 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

The surface appendages of bacteria determine the initial contact with host cells. Characterisation of functional organisation and spatial distribution of adhesive traits of outer membrane components of Gram-negative bacteria is a key issue in studies of the parasite-host cell interaction.

With focus on the enteropathogenic Helicobacter pylori, evidenced to cause chronic gastric infections in humans, detergent-digested freeze fracture replica labelling was applied for ultrastructural analyses of envelope distribution of the virulence factors blood group antigen binding adhesin (BabA), and the carbonic anhydrases (α-CA, ß-CA). In a preliminary study the methodology was also used to study the bacteria-host contact between phagocytosing human neutrophils and wild-type H. pylori.

In parallel, bacterial traits were analysed from a molecular and biochemical perspective. This included the specific roles of the BabA and the sialic acid-binding adhesin (SabA), and the neutrophil activating protein (HP-NAP) in neutrophilic stimulation and subsequent inflammatory process. It was concluded that SabA is crucial in the initiation of a neutrophilic response in the mediated inflammation.

This thesis has demonstrated the synergistic application of ultrastructural, molecular and cellular microbiology tools for delineating complex patterns in bacteria-host interactions, thus utilising the well-characterised and clinically important human pathogen H. pylori. This approach could be applicable to other Gram-negative species to clarify known and discern new virulence mechanisms in the multifaceted field of bacterial pathogenesis and bacterial interactions with human host cells.

Place, publisher, year, edition, pages
Linköping: Linköpings universitet, 2003. 77 p.
Linköping University Medical Dissertations, ISSN 0345-0082 ; 805
National Category
Medical and Health Sciences
urn:nbn:se:liu:diva-26665 (URN)11231 (Local ID)91-7373-490-X (ISBN)11231 (Archive number)11231 (OAI)
Public defence
2003-10-03, Elsa Brändströmsalen, Hälsouniversitetet, Linköping, 09:00 (Swedish)
Available from: 2009-10-08 Created: 2009-10-08 Last updated: 2012-10-15Bibliographically approved

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Petersson, Christoffer
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Medical MicrobiologyFaculty of Health Sciences
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