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Related Experiment Videos

CD80/CD28 co-stimulation in human brucellosis.

P Skendros1, P Boura, F Kamaria

  • 1Clinical Immunology Unit, 2nd Department of Internal Medicine, Aristotle University of Thessaloniki, Thessaloniki, Greece.

Clinical and Experimental Immunology
|November 15, 2006
PubMed
Summary

Chronic brucellosis patients show altered monocyte responses, suggesting CD80/CD28 co-stimulation may indicate disease status. This study investigates immune cell differences in acute, chronic, and cured brucellosis.

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Area of Science:

  • Immunology
  • Infectious Diseases
  • Cell Biology

Background:

  • Brucellosis can lead to chronic disease in 10-30% of patients, often with relapses or atypical presentations.
  • A defective T helper 1 (Th1) response and reduced CD4(+)/CD25(+) cells are noted in chronic brucellosis.
  • The role of CD80/CD28 co-stimulation in human brucellosis immunity remains unexamined.

Purpose of the Study:

  • To investigate the role of CD80/CD28 co-stimulation in patients with acute brucellosis (AB), chronic brucellosis (CB), 'cured' subjects, and healthy controls.
  • To analyze the expression of CD4(+)/CD28(+) T lymphocytes and CD14(+)/CD80(+) monocytes in different brucellosis states.
  • To determine if CD80/CD28 co-stimulation correlates with disease status and clinical forms of chronic brucellosis.

Main Methods:

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  • Flow cytometry was used to analyze CD4(+)/CD28(+) T lymphocytes and CD14(+)/CD80(+) monocytes.
  • Samples were analyzed ex vivo and after stimulation with phytohaemagglutinin (PHA) with or without heat-killed Brucella abortus (HkBA).
  • Study included 13 AB, 22 CB (12 relapsing-CB1, 10 atypical-CB2), 11 'cured' subjects, and 15 healthy controls.

Main Results:

  • Ex vivo analysis showed no significant differences between groups.
  • PHA stimulation increased CD80(+) monocytes in AB patients compared to controls.
  • A higher percentage of CD80(+) monocytes was observed in CB1 (relapsing) compared to AB and controls, while CB2 (atypical) showed lower CD80(+) monocytes than CB1.
  • HkBA reduced CD80(+) monocyte percentages in PHA-stimulated cultures, particularly in AB and CB patients.

Conclusions:

  • The reduced CD4(+)/CD25(+) T cells in chronic brucellosis are not linked to insufficient CD80/CD28 co-stimulation.
  • Differential frequencies of CD80(+) monocytes post-PHA stimulation may serve as a marker for disease status.
  • These findings suggest potential for using monocyte CD80 expression to differentiate clinical forms of chronic brucellosis.