Activation and Recruitment of GIL During Hp Infection

January 11, 2006 updated by: National Taiwan University Hospital

Activation and Recruitment of Gastric Infiltrating Lymphocytes During H. Pylori Infection

Helicobacter pylori is a major human pathogen that infects over half of the world population. Infection initiates a series of changes in the gastric mucosa, beginning with gastritis and leading in some patients to peptic ulcer disease, mucosa-associated lymphomas, and gastric adenocarcinoma. It is believed that host factors, in particular, the T cell-mediated immune responses may play an important role in the pathogenesis of diseases induced by H. pylori infection. Recent results revealed that there were higher IFN-γ secreting cells in gastric infiltrating T cells isolated from H. pylori infected patients than in uninfected patients, suggesting that the TH1 response and degree of IFN-γ production is associated with disease severity. Meanwhile, recent studies have shown that apoptosis of the gastric epithelium is increased during infection and this response is associated with an expansion of gastric T-helper type 1 (Th1) cells. In this project, we are trying to further investigate role of host T cell mediated immune response in pathogenesis of Helicobacter infection by characterization of the expression of chemokine receptors on gastric infiltrating lymphocytes. We are going to investigate the mechanisms involving in chemokine/chemokine receptor interaction in recruitment of gastric infiltrating lymphocytes and pathogenesis of gastric mucosa damage in Helicobacter infection. This study will be helpful for understanding the mechanisms of activation and recruitment of gastric-infiltrating lymphocytes during gastric inflammation.

Study Overview

Status

Unknown

Conditions

Detailed Description

Specific Aim #1: Characterization of the gastric infiltrating T cells from H. pylori gastritis patients A. Patients H. pylori infected gastritis and asymptomatic patients are selected from National Taiwan University hospital. The gastric biopsy specimen are taken from endoscopic biopsy in routine health check up or panendoscopic examination for the despeptic patients. HP negative gastritis patients will also be studied for negative control.

B. Immunohistochemical identification of T cells and expression of chemokine receptors.

Specific Aim #2 . Isolation and characterization of chemokines and chemokine receptors of the infiltrating lymphocytes in H. pylori-associated gastritis tissue

A. Isolation of gastric infiltrating lymphocyte B. Identification of the expression of chemokine receptor in gastric infiltrating lymphocytes by flow cytometry C. Detection of expression of chemokines in gastric tissues

Study Type

Observational

Enrollment

30

Contacts and Locations

This section provides the contact details for those conducting the study, and information on where this study is being conducted.

Study Contact

Study Locations

  • Taiwan
      • Taipei, Taiwan
        • Recruiting
        • National Taiwan University Hospital
        • Contact:
        • Principal Investigator:
          • Ping-Ning Hsu, MD, PhD

Participation Criteria

Researchers look for people who fit a certain description, called eligibility criteria. Some examples of these criteria are a person's general health condition or prior treatments.

Eligibility Criteria

Ages Eligible for Study

20 years to 60 years (Adult)

Accepts Healthy Volunteers

No

Genders Eligible for Study

All

Description

Inclusion Criteria:

  • patients receiveing endoscopy examination due to dyspepsia

Exclusion Criteria:

  • nil

Study Plan

This section provides details of the study plan, including how the study is designed and what the study is measuring.

How is the study designed?

Design Details

  • Observational Models: Case-Control
  • Time Perspectives: Other

Collaborators and Investigators

This is where you will find people and organizations involved with this study.

Sponsor

National Taiwan University Hospital

Investigators

  • Principal Investigator: Ping-Ning Hsu, MD, PhD, Department of Immunology

Study record dates

These dates track the progress of study record and summary results submissions to ClinicalTrials.gov. Study records and reported results are reviewed by the National Library of Medicine (NLM) to make sure they meet specific quality control standards before being posted on the public website.

Study Major Dates

Study Start

January 1, 2006

Study Completion

December 1, 2008

Study Registration Dates

First Submitted

January 11, 2006

First Submitted That Met QC Criteria

January 11, 2006

First Posted (Estimate)

January 12, 2006

Study Record Updates

Last Update Posted (Estimate)

January 12, 2006

Last Update Submitted That Met QC Criteria

January 11, 2006

Last Verified

December 1, 2005

More Information

Terms related to this study

Additional Relevant MeSH Terms

Other Study ID Numbers

  • 9461701221

This information was retrieved directly from the website clinicaltrials.gov without any changes. If you have any requests to change, remove or update your study details, please contact register@clinicaltrials.gov. As soon as a change is implemented on clinicaltrials.gov, this will be updated automatically on our website as well.

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