Characterizing the Cellular Immune Response to Parainfluenza Virus 3

Area of Science:

• Immunology
• Virology
• Cellular Therapy

Background:

• Parainfluenza virus type 3 (PIV3) poses significant risks to immunocompromised individuals, lacking approved treatments.
• Adoptive T cell therapy is effective for various viral infections but limited by known viral antigens, excluding PIV3.

Purpose of the Study:

• To characterize the cellular immune response to all 7 PIV3 antigens.
• To define the hierarchy of PIV3 antigen immunogenicity.
• To support the clinical application of PIV3-specific T cells.

Main Methods:

• Analysis of T cell response to all 7 PIV3 antigens in 17 healthy donors.
• Assessment of CD4+ and CD8+ T cell effector functions (cytokine production, target cell killing).
• Correlation of PIV3-specific T cells with viral control in hematopoietic stem cell transplant recipients.

Main Results:

• Defined a hierarchy of immunogenicity for PIV3 antigens based on donor response frequency and magnitude.
• Identified reactive CD4+ and CD8+ T cells producing Th1 cytokines and killing PIV3-infected cells.
• Demonstrated a direct correlation between PIV3-specific T cells and viral control in transplant recipients.

Conclusions:

• PIV3-specific T cells exhibit effector functions and clinical relevance in controlling PIV3 infections.
• Findings support the clinical use of PIV3-specific T cells manufactured under Good Manufacturing Practice (GMP) conditions.
• This approach offers a potential therapy for immunocompromised patients with uncontrolled PIV3 infections.