Alterations in lymphocyte cell surface markers during various human infections

Area of Science:

• Immunology
• Clinical Medicine
• Infectious Diseases

Background:

• Acute infections can profoundly impact the immune system.
• Understanding lymphocyte subset dynamics is crucial for assessing infection severity and prognosis.

Purpose of the Study:

• To investigate peripheral blood lymphocyte cell surface marker changes in patients with acute infections.
• To correlate these immunological changes with clinical outcomes and treatment responses.

Main Methods:

• Flow cytometry analysis of B cell and T cell subsets (helper-inducer, suppressor-cytotoxic) in 146 infected patients.
• Utilized anti-surface immunoglobulin and hybridoma reagents for cell identification and enumeration.
• Correlated marker abnormalities with clinical status, age, and treatment outcomes.

Main Results:

• Significant reductions in total T cells and T cell subsets observed in pneumonia, pyelonephritis, and sepsis.
• Reduced OKT4 helper-inducer T cells noted in older patients (>60) with pneumonia or sepsis.
• Multiple T cell phenotypic abnormalities were common in severe infections.
• Persistent T cell depressions correlated with poor prognosis and mortality in sepsis.
• Improvement in T cell numbers paralleled clinical recovery with effective treatment.

Conclusions:

• Acute infections, especially severe sepsis and pneumonia, induce significant T cell subset depletion.
• T cell subset abnormalities serve as potential biomarkers for infection severity and prognosis.
• Monitoring lymphocyte phenotypes can aid in predicting patient outcomes and guiding therapeutic strategies.