Increased CD64 expression on polymorphonuclear neutrophils indicates infectious complications following solid organ...

Area of Science:

• Transplantation immunology
• Clinical diagnostics
• Flow cytometry

Background:

• Postoperative infectious complications are a significant risk in solid organ transplant recipients.
• Accurate and timely diagnosis is crucial for effective management and improved patient outcomes.
• Existing diagnostic markers may lack sufficient sensitivity or specificity for early detection.

Purpose of the Study:

• To assess the diagnostic utility of monitoring CD64 antigen expression on polymorphonuclear neutrophils (PMN) for identifying infectious complications after solid organ transplantation.
• To compare the diagnostic performance of PMN CD64 Index with other immune cell markers in the postoperative period.
• To evaluate the role of PMN CD64 Index in differentiating infections from rejections in transplant patients.

Main Methods:

• Prospective study including kidney, liver, and pancreas-kidney transplant recipients.
• Flow cytometry was used to measure PMN CD64 Index, HLA-DR on monocytes, NKp44+ NK and NK/T cells, CXCR3+ NK cells, CXCR3+ T helper cells, CXCR3+ NK/T cells, and CD4/CD8 ratio.
• Measurements were taken from preoperative values up to 3 months postoperatively and correlated with confirmed complications.

Main Results:

• The PMN CD64 Index demonstrated a sensitivity of 89% and a specificity of 65% for detecting infectious complications.
• PMN CD64 Index was a significantly better marker for infections than most other tested parameters, except CXCR3+ NK/T cells.
• The PMN CD64 Index showed no diagnostic relevance in detecting transplant rejections.
• Combining multiple parameters did not enhance the overall diagnostic value.

Conclusions:

• Monitoring CD64 upregulation on PMN is a highly sensitive and specific indicator for postoperative infectious complications in solid organ transplant patients.
• The PMN CD64 Index serves as a valuable tool for evaluating suspected infections in the postoperative transplant setting.
• CD64 monitoring is not effective for diagnosing transplant rejections.