Subduing the Inflammatory Cytokine Storm

Area of Science:

• Immunology
• Molecular Biology
• Infectious Diseases

Background:

• Exaggerated inflammatory cytokine responses, or cytokine storms, contribute to severe disease and lethality in various infections.
• Bacterial sepsis and toxic shock, especially with multidrug-resistant strains, pose significant threats.
• The B7/CD28 costimulatory axis plays a crucial role in regulating immune responses.

Purpose of the Study:

• To develop a molecular tool to analyze the B7/CD28 axis in human inflammatory responses.
• To create a therapeutic strategy to attenuate cytokine storms while preserving host defense.
• To investigate the efficacy of peptide mimetics targeting CD28-B7 interactions.

Main Methods:

• Designed short peptide mimetics mimicking human CD28 and B7 receptor homodimer interfaces.
• Utilized these peptides as molecular tools to dissect the B7/CD28 costimulatory axis.
• Tested peptide efficacy in mouse models of bacterial superantigen-induced toxic shock and in the context of necrotizing soft tissue infections.

Main Results:

• Peptide mimetics effectively attenuated the inflammatory response.
• Mice treated with peptides were protected from lethal Gram-positive bacterial superantigen-induced toxic shock.
• Peptides demonstrated efficacy at molar amounts significantly lower than the inducing agent.

Conclusions:

• Peptide mimetics targeting the CD28-B7 engagement offer a novel therapeutic strategy against cytokine storms.
• This approach holds promise for treating severe bacterial infections like toxic shock and necrotizing soft tissue infections.
• The developed peptides serve as valuable tools for understanding inflammatory mechanisms.