Immune Cell Dynamics in Sepsis Pathophysiology

Sepsis arises from a dysregulated host response to infection, characterised by an initial surge of innate immune activation that can precipitate widespread inflammation, tissue injury and organ dysfunction. Innate populations such as neutrophils, monocytes and dendritic cells undergo hyperactivation, releasing cytokines and reactive mediators that both control pathogens and damage host tissues. As the course of sepsis advances, a counter-regulatory phase of immunosuppression emerges, driven by extensive programmed death of immune cells, functional exhaustion and metabolic reprogramming. Apoptotic and inflammatory cell-death pathways deplete key antigen-presenting cells, while lymphopenia erodes adaptive responses. Surviving lymphocytes frequently exhibit an exhausted or tolerogenic phenotype, undermining vaccine responses and increasing susceptibility to secondary infections. Recent high-dimensional analyses have revealed substantial heterogeneity in immune trajectories among patients, emphasising the need to stratify sepsis into biologically defined subgroups. Understanding the balance between harmful hyperinflammation and ensuing immunosuppression, and the mechanisms that regulate cell-death programmes, is critical for developing targeted immunomodulatory interventions and improving outcomes globally.

Research from Nature Portfolio

No recent Nature Portfolio content available.

Immune Cell Dynamics in Sepsis Pathophysiology publication trend

The graph below shows the total number of articles in immune cell dynamics in sepsis pathophysiology across all publications each year (not limited to Nature Index journals).

Technical terms

Dendritic cells: Professional antigen-presenting cells that link innate sensing to adaptive T-cell activation.

T follicular helper cells: Subset of CD4+ T cells that support B-cell maturation and antibody affinity maturation within germinal centres.

Apoptosis: Programmed non-inflammatory cell-death pathway important in elimination of excess or damaged cells.

Pyroptosis: Inflammatory form of regulated cell death driven by caspase activation and gasdermin pore formation.

Lymphopenia: Reduction in circulating lymphocyte numbers, often observed in sepsis and associated with poor prognosis.

Immunophenotyping: Characterisation of immune cell subsets and functional states using markers such as surface proteins or intracellular cytokines.

References

1. Dysregulated dendritic cells in sepsis: functional impairment and regulated cell death. Cellular & Molecular Biology Letters (2024).
2. Destabilisation of T cell-dependent humoral immunity in sepsis. Clinical Science (2024).
3. Advances and Challenges in Sepsis Management: Modern Tools and Future Directions. Cells (2024).