CD8⁺ T Cell Biology in Cytokine Storm Syndromes

Area of Science:

• Immunology
• Genetics
• Cell Biology

Background:

• Familial hemophagocytic lymphohistiocytosis (HLH) involves genetic defects in cytotoxic lymphocytes.
• Perforin is crucial for target cell killing by CD8+ T cells and NK cells.

Purpose of the Study:

• To highlight genetic findings implicating CD8+ T cells in familial HLH pathogenesis.
• To discuss mechanistic insights into CD8+ T cell contributions to HLH and cytokine release syndromes (CSS).

Main Methods:

• Review of recent genetic findings in familial HLH.
• Analysis of mechanistic insights from animal models and patient studies.
• Examination of molecular mechanisms of CD8+ T cell cytotoxicity.

Main Results:

• Loss-of-function mutations in HLH genes affect perforin and cytotoxic granule release.
• CD8+ T cells, through mechanisms including IFN-γ release, contribute to HLH pathogenesis.
• CD8+ T cells and NK cells may have differential roles in severe hyperinflammatory diseases like HLH.

Conclusions:

• Recent insights into HLH pathophysiology provide potential new therapeutic targets.
• Understanding CD8+ T cell roles in HLH and CSS is crucial for developing targeted therapies.