Background and Objectives: Sepsis involves a dysregulated host response, characterized by simultaneous immunosuppression and hyperinflammation. Initially, there is the release of pro-inflammatory factors and immune system dysfunction, followed by persistent immune paralysis leading to apoptosis. This study investigates sepsis-induced apoptosis and its pathways, by assessing changes in PD-1 and PD-L1 serum levels, CD4+ and CD8+ T cells, and Sequential Organ Failure Assessment (SOFA) and Acute Physiology and Chronic Health Evaluation (APACHE II) severity scores.
Materials and Methods: This prospective, observational, single-centre study enrolled 87 sepsis patients admitted to the intensive care unit at the County Emergency Clinical Hospital in Târgu Mureș, Romania. We monitored the parameters on day 1 (the day sepsis or septic shock was diagnosed as per the Sepsis-3 Consensus) and day 5.
Results: Our study found a statistically significant variation in the SOFA score for the entirety of the patients between the studied days (
p = 0.001), as well as for the studied patient groups: sepsis, septic shock, survivors, and non-survivors (
p = 0.001,
p = 0.003,
p = 0.01,
p = 0.03). On day 1, we found statistically significant correlations between CD8+ cells and PD-1 (
p = 0.02) and PD-L1 (
p = 0.04), CD4+ and CD8+ cells (
p < 0.0001), SOFA and APACHE II scores (
p < 0.0001), and SOFA and APACHE II scores and PD-L1 (
p = 0.001 and
p = 0.01). On day 5, we found statistically significant correlations between CD4+ and CD8+ cells and PD-L1 (
p = 0.03 and
p = 0.0099), CD4+ and CD8+ cells (
p < 0.0001), and SOFA and APACHE II scores (
p < 0.0001).
Conclusions: The reduction in Th CD4+ and Tc CD8+ lymphocyte subpopulations were evident from day 1, indicating that apoptosis is a crucial factor in the progression of sepsis and septic shock. The increased expression of the PD-1/PD-L1 axis impairs costimulatory signalling, leading to diminished T cell responses and lymphopenia, thereby increasing the susceptibility to nosocomial infections.
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