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[Evaluation of lymphocyte activation in patients in intensive care units by using flow cytometry for determining
M Steinbachová1, M Průcha, I Herold
1Oddĕlení klinické biochemie, hematologie a imunologie, Nemocnice Na Homolce, Praha. steinbachova.m@seznam.cz
Insights
Lower CD69 T lymphocyte activation was observed in sepsis and non-infectious systemic inflammatory response. This immune marker may aid in differentiating causes of critical illness, though not directly correlated with other immune parameters.
Area of Science:
- Immunology
- Critical Care Medicine
- Pathophysiology
Context:
- Disorders in immune reactions are central to sepsis and systemic inflammatory response syndrome (SIRS) in Intensive Care Units (ICUs).
- Evaluating T lymphocyte functional capacity via early activation markers like CD69 is crucial for understanding immune responses in critically ill patients.
- Differentiating infectious from non-infectious causes of SIRS is vital for appropriate patient management.
Purpose:
- To investigate the expression of CD69 on T lymphocytes in patients with sepsis versus non-infectious SIRS.
- To assess the utility of CD69 and other immunological parameters (IgG, IgA, IgM, leukocytes, TNF alpha, CD64, C3, C4, prealbumin, procalcitonin) in the differential diagnosis of infectious and non-infectious SIRS.
- To explore correlations between CD69 expression and various immunological markers in these patient groups.
Summary:
- Lower expression of CD69 on CD3+ CD8+ lymphocytes was observed following phytohemagglutinin stimulation in both sepsis and non-infectious SIRS patients.
- No significant differences were found in IgG, IgA, IgM, leukocyte counts, lymphocyte percentages, TNF alpha, or CD64 expression between the groups.
- Significant differences were noted in C3, C4 complement components, prealbumin, and procalcitonin levels, but CD69 expression did not correlate with these or other tested immunological parameters.
Impact:
- The study suggests that while CD69 expression is altered in both sepsis and non-infectious SIRS, its specific pattern may not be a definitive differentiator on its own.
- Findings highlight the complexity of immune dysregulation in critical illness and the need for multi-parameter assessment.
- Further research is warranted to elucidate the precise role of CD69 and its relationship with other biomarkers in distinguishing the etiology of SIRS.
Abstract:
Disorders in immune reactions represent one of the main pathogenetic mechanisms in patients of Intensive Care Units who suffer from sepsis or syndrome of systemic inflammatory response. The determination of early activation sign CD69 on T lymphocytes makes it possible to evaluate functional capacity of this cell population. The determination of other selected immunological parameters contributes to differential diagnosis of infectious and non-infectious etiology of systemic inflammatory response. The authors demonstrated lower expression of CD69 on CD3+ CD8+ lymphocytes after stimulation with phytohemagglutinin in patients with sepsis as well as patients with the syndrome of systemic inflammatory response of non-infections etiology. No statistically significant differences were proved in the concentrations of IgG, IgA and IgM, number of leukocytes, percentual representation of lymphocytes, TNF alpha production and the expression of surface sign of CD64 in both groups of patients. There were statistically significant differences in the concentrations of C3 and C4 components of complement, prealbumin and procalcitonin. The study did not show correlation between the expression of CD69 and selected immunological parameters (IgA, IgM, IgG, C3, C4, leukocytes, lymphocytes, prealbumin, procalcitonin, TNF alpha and CD64).
