Macaque blood-derived antigen-presenting cells elicit SIV-specific immune responses

Area of Science:

• Immunology
• Vaccinology
• Cell Biology

Background:

• Antigen-presenting cells (APCs) are crucial for vaccine efficacy.
• Investigating novel APCs like fibrocytes for vaccine development is essential.
• Understanding SIV vaccine strategies in non-human primate models is vital.

Purpose of the Study:

• To evaluate the potential of natural blood-borne antigen-presenting cells (APCs) to enhance SIV vaccine antigen presentation.
• To characterize macaque fibrocytes and monocyte-derived dendritic cells (DCs) for use in vaccine strategies.
• To assess the immunogenicity of autologous DCs pulsed with SIV in Macaca fascicularis.

Main Methods:

• Isolation and characterization of macaque fibrocytes and monocyte-derived DCs.
• Transfection of fibrocytes and DCs with SIV genes or reporter plasmids.
• In vitro pulsing of DCs with inactivated SIV.
• Subcutaneous re-infusion of autologous DCs into macaques.

Main Results:

• Macaque fibrocytes exhibited characteristics similar to human and murine fibrocytes.
• Autologous monocyte-derived DCs pulsed with inactivated SIV elicited cellular and/or humoral immune responses in 80% of vaccinated macaques.
• Transfected cells were assessed for gene expression and cellular markers.

Conclusions:

• Autologous monocyte-derived dendritic cells pulsed with SIV are immunogenic in Macaca fascicularis.
• This approach shows promise for developing effective SIV vaccines.
• Further research into fibrocytes as APCs for vaccine applications is warranted.