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Related Experiment Videos

Reduced monocyte CD86 expression in postinflammatory immunodeficiency.

Kerstin Wolk1, Conny Höflich, Heidrun Zuckermann-Becker

  • 1Institute of Medical Immunology and Department of General, Visceral, Vascular, Thoracic Surgery, University Hospital Charité, Berlin, Germany.

Critical Care Medicine
|January 6, 2007
PubMed
Summary
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Reduced expression of CD86 on monocytes in intensive care unit (ICU) patients correlates with diminished human leukocyte antigen (HLA)-DR. This finding may aid in diagnosing postinflammatory immunodeficiency in ICU patients.

Area of Science:

  • Immunology
  • Critical Care Medicine
  • Molecular Biology

Background:

  • Post-surgical and trauma patients often develop anti-inflammatory response syndrome, leading to immunodeficiency and increased infection risk.
  • This immunodeficiency is characterized by impaired monocyte function, with reduced human leukocyte antigen (HLA)-DR expression being a key diagnostic marker.
  • The role of co-stimulatory molecules like CD86 in this context requires further elucidation.

Purpose of the Study:

  • To investigate the expression of CD86, a critical co-stimulatory molecule, on monocytes in intensive care unit (ICU) patients.
  • To determine the correlation between CD86 expression and HLA-DR expression on monocytes in ICU patients.
  • To assess the diagnostic and prognostic value of monocyte CD86 expression in postinflammatory immunodeficiency.

Related Experiment Videos

Main Methods:

  • Flow cytometry was used to analyze the expression of HLA-DR, CD86, and CD80 on monocytes and B cells from healthy donors and ICU patients.
  • Real-time polymerase chain reaction (PCR) was employed to quantify CD86 messenger RNA (mRNA) levels in isolated monocytes.
  • Established normal ranges for monocyte CD86 expression in healthy individuals were determined.

Main Results:

  • Monocyte CD86 expression in healthy subjects ranged from 2128 to 5102 surface molecules per cell, independent of demographic and hematologic parameters.
  • In ICU patients, CD86 expression on monocytes correlated significantly with HLA-DR expression.
  • Approximately 40% of ICU patients with sustained low HLA-DR expression also exhibited reduced CD86 expression, associated with an unfavorable prognosis.
  • Reduced surface CD86 expression correlated with decreased CD86 mRNA levels, indicating transcriptional regulation.
  • CD86 expression on B cells and CD80 expression on monocytes and B cells were not significantly altered in ICU patients.

Conclusions:

  • Monocyte CD86 expression is diminished in a subset of ICU patients with postinflammatory immunodeficiency.
  • The reduction in CD86 expression is linked to decreased CD86 mRNA levels.
  • Monocyte CD86 expression may serve as a valuable diagnostic marker for identifying immunodeficiency in ICU patients, particularly when assessed alongside HLA-DR expression.